JP5059391B2 - Duplex printing method and duplex printing apparatus - Google Patents

Description

  The present invention relates to a duplex printing apparatus including a duplex printing method and a stencil duplex printing apparatus.

  Recently, a digital thermal stencil duplex printing apparatus has been proposed as a duplex printing apparatus using a simple duplex printing method (see, for example, Patent Documents 1 to 4). The double-sided printing apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-200355 and Japanese Patent Application Laid-Open No. 2004-26373 includes the first plate-making image and the second image within the length of one plate along the rotation direction of the plate cylinder. A printing cylinder having a divided plate-making master on which two plate-making images are formed side by side, a printing unit having pressing means that can be moved toward and away from the printing cylinder, and a sheet of paper toward the printing unit A paper feed unit for feeding paper, a paper discharge unit for discharging printed paper printed by the printing unit, and an auxiliary tray for temporarily storing printed paper with a printed image formed on the surface thereof at the printing unit ( Re-feed storage means), re-feed means for reversing the surface printed paper stored in the auxiliary tray and re-feeding it toward the printing section, and re-feed storage means for re-feeding the paper that has passed the printing section or Basics such as a switching member (switching means) that guides the paper discharge unit It is provided with a formed.

  Then, during double-sided printing, the first sheet is fed from the sheet feeding unit to the printing unit, and one of the first plate-making image and the second plate-making image is printed on the surface, and the printed one sheet After the eye sheet is guided to the auxiliary tray by the switching member, the second sheet is fed from the sheet feeding unit to the printing unit, and one of the first plate making image and the second plate making image is provided on the surface. Printing is performed, and the first sheet is re-fed to the printing unit by the re-feeding unit, and the other one of the first plate-making image and the second plate-making image is printed on the back surface, and the first sheet is printed by the switching member. This sheet is guided to the paper discharge section, and the second sheet is guided to the auxiliary tray. In this way, except for the first sheet and the last sheet, printing is possible on both sides of the sheet with one rotation of the plate cylinder.

Japanese Patent No. 3545861 JP 2003-200355 A JP 2004-26373 A JP 2005-153179 A

However, when printing is performed using the same divided master for duplex printing with the above-mentioned stencil duplex printing apparatus, the plate cylinder is clamped and wound by the increase in the number of printed sheets as the printing progresses. In some cases, the position of the master gradually shifts upstream in the rotational direction of the plate cylinder. If double-sided printing is performed without noticing such a “master misalignment” state, the print image position in the paper transport direction (hereinafter also referred to as “top-to-bottom direction”) with respect to the front and / or back side of the paper will be misaligned. . The position of the front surface print image with respect to the front surface of the paper (hereinafter also referred to as “front surface print position”) and / or the position of the back surface print image with respect to the rear surface of the paper (hereinafter also referred to as “back surface print position”) when the duplex printing is completed. When confirmed, printing is already finished. Hereinafter, the front surface printing position and / or the back surface printing position is also referred to as “double-sided printing position”.
Further, in the stencil duplex printing device, when duplex printing is performed using the same divided master-making master, there may be a gradual shift due to different causes of the front surface print position shift and / or the back surface print position shift. That is, it is a phenomenon called “master elongation” in which the master clamped on the plate cylinder gradually grows as the number of printed sheets increases. When the printing position is shifted due to the master elongation, double-sided printing is performed again. Hereinafter, the front surface printing position deviation and / or the back surface printing position deviation is also referred to as “double-sided printing position deviation”.

  With reference to FIG. 26A and FIG. 26B, the master position shift in the double-sided printing apparatus will be described. As shown in FIG. 26 (a), the master position deviation in the stencil duplex printing apparatus, particularly in the printing apparatus, is based on the following mechanical structure and system in which the divided master-making master 65 is wound around the outer peripheral surface of the plate cylinder 12. Problems exist. That is, when the divided master plate 65 is wound around the outer peripheral surface of the plate cylinder 12, first, it is divided by the clamper 19b that can be opened and closed via the clamper shaft 19c of the stage portion 19a disposed on the plate cylinder 12. After clamping and holding the front end portion of the plate-making master 65, the divided plate-making master 65 is wound around the outer peripheral surface of the plate cylinder 12 by rotating the plate cylinder 12 in the direction (clockwise direction) in the figure. The split plate-making master 65 at the initial stage of winding has a slight amount of initial wrinkles 65X, uses a press roller 13 as pressing means, and rotates a press roller 13 different from the plate cylinder driving means. In the case of a model that does not have a printing plate, when printing pressure is applied by the press roller 13 during printing, the divided plate-making master 65 is pulled in the rotational direction of the plate cylinder 12, so that the initial wrinkle 65X and the divided plate-making master 65 alone are used. Before the initial elongation is absorbed, the master misalignment inevitably occurs, and as a result, the duplex printing misalignment occurs.

The position at which the initial deflection 65X of the divided master-making master 65 is generated is normally a non-opening portion outside the range of the opening portion (not shown) having a large number of openings in the plate cylinder 12, that is, the clamper 19b arrangement portion. Since it is the periphery of the front end of the divided plate-making master 65 corresponding to the periphery, the divided plate-made master 65 for the initial wrinkle 65X is affixed to the outer peripheral surface of the plate cylinder 12 by the adhesive force of the ink that oozes from the opening of the opening. It is not attached.
As shown in FIG. 26 (b), the initial elongation of the split master-making master 65 alone is absorbed in addition to the initial deflection 65X, as shown in FIG. Due to the adhesive force of the ink that the divided plate-making master 65 has oozed out from the opening of the plate cylinder 12, the divided plate-making master 65 is stuck to the outer peripheral surface of the plate cylinder 12 except for the rear end portion 65Z.
In FIG. 26A and FIG. 26B, 65Y indicates the rear end of the divided plate-making master 65 wound around the outer peripheral surface of the plate cylinder 12. In FIG. 16, FIG. 18 etc. which are described in each embodiment described later , the illustration of the ink supply means 15 etc. shown in FIG. 1, FIG. 26 (a) and FIG. 26 (b) is omitted.

As described above, in double-sided printing, one master performs plate making for forming a front plate-making image for transfer onto the front surface of the paper and plate making for forming a back-side plate making image for transfer to the back surface of the paper. After the divided plate-making master is wound around the plate cylinder, double-sided printing is performed by applying printing pressure to each plate-making image in the divided plate-making master on the plate cylinder at the same timing of feeding.
For this reason, when a double-sided printing position shift occurs due to the above-described master position shift, it is necessary to repeatedly perform double-side plate making or printing on paper using the double-side plate-making master because the printing has been performed again. In addition, the time and the master used for plate making and the paper used for printing were wasted.

  Therefore, the present invention has been made in view of the above-described circumstances, and pays attention to the relationship between the number of prints and the master position deviation in the rotation direction of the plate cylinder, with regard to the master position deviation that occurs during double-sided printing. The surface top and bottom top movement correction value and back surface top and bottom movement correction value corresponding to the parameters including the number of prints are determined in advance through experiments and set during printing based on the set top and bottom top and bottom top movement correction value. In addition to automatically executing the surface top / bottom movement correction by using a known front / top surface moving means, a known back / top / bottom moving means or a back surface / top / bottom moving means which is not known but has a function added to a known configuration is used. By automatically executing backside up / down movement correction, it is possible to prevent misalignment of the printing position and eliminate waste of the master and print media (paper). Shortening of work time, the first object to provide a duplex printing method and double-sided printing apparatus capable of reducing man-hours.

  The present invention obtains the master rear end position data by detecting the rear end position of the divided plate-making master on the plate cylinder as needed, and obtains the master position deviation amount by calculation from these master rear end position data, that is, printing The difference obtained by subtracting the master length related to the master rear end position detected at any time from the master length related to the master rear end position as a reference at the start is regarded as the master position shift amount, and the surface top-and-bottom movement from this master position shift amount A correction value and a back-and-back top movement correction value are obtained, and during printing, a front-and-back top-and-bottom movement correction is automatically performed using a known front-and-back movement and a known back-and-top movement unit or a known but not known By using the back / upside / downside movement means with the function added to the configuration, the backside / upside / downside movement correction is automatically executed to prevent the printing position deviation, and the master and the print medium. Shortening the work time with eliminating waste of paper), and the second object is to provide a double-sided printing apparatus capable of reducing the number of operation steps.

  Further, the present invention uses a master on which display for detecting the master length is performed, and detects master length data by detecting the display position related to the master length of the divided plate-making master on the plate cylinder at any time. Obtaining the master misalignment amount by calculation from these master length data, etc., that is, the difference obtained by subtracting the master length detected at any time from the master length as a reference at the start of printing is regarded as the master misalignment amount, A front-and-back movement correction value and a back-and-bottom movement correction value are obtained from the master position deviation amount, and a front-and-back movement correction is automatically performed using a known front-and-top movement means during printing. By using the moving means or the backside upright moving means which is not known but has a function added to a known configuration, the backside upside movement correction is automatically executed, so that the printing position deviation is not caused. It prevented the shortening of the working time with eliminating waste of the master and the printing medium (paper), and the third object of providing a double-sided printing apparatus capable of reducing the number of operation steps.

  Further, the present invention is provided with a display device for displaying on the master for detecting the master length in the plate making apparatus, and by detecting at any time the display position related to the master length of the divided plate-making master on the plate cylinder. Obtain master length data, calculate the master position deviation amount from these master length data, etc., that is, obtain the difference obtained by subtracting the master length detected at any time from the master length used as the reference at the start of printing. It is regarded as a deviation amount, and the top and bottom movement correction value and the back and top movement correction value are obtained from the master position deviation amount, and the surface and vertical movement correction is automatically executed during printing using a known front and top movement means. By automatically executing backside top / bottom movement correction using a known backside top / bottom moving means or a backside top / bottom moving means that adds a function to a known but not known configuration. Preventing the printing positional deviation in advance, reduction of working time with eliminating waste of the master and the printing medium (paper), and the fourth object of providing a double-sided printing apparatus capable of reducing the number of operation steps.

In order to solve the above-described problems and achieve the above-mentioned object, the invention according to each claim employs the following characteristic means / invention-specific matters (hereinafter referred to as “configuration”).
According to the first aspect of the present invention, there is provided a plate cylinder for winding a divided plate-making master formed by arranging two first plate-making images and two second plate-making images side by side in the rotation direction, and the plate cylinder on the plate cylinder. Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the first plate-making image and the second plate-making image in the divided plate-making master to the surface of the print medium in the transport direction of the print medium; A back surface that moves a position of a back surface printed image transferred from either one of the first plate making image and the second plate making image on the plate cylinder on the plate cylinder to the back surface of the printing medium in the transport direction of the printing medium. In a double-sided printing method using a double-sided printing device having top-and-bottom moving means, the surface top-and-bottom movement correction value according to a parameter including the number of prints that affects the positional deviation of the divided plate-making master in the rotation direction of the plate cylinder. And the back-and-back top-and-bottom movement correction value is set in advance, and the front-and-back top-and-bottom movement correction is automatically performed during printing based on the front-and-back and top-and-bottom movement correction value. Based on the correction value, during the printing, the back surface up / down moving means is used to automatically execute back surface top / down movement correction.

Here, “the positional deviation of the divided plate-making master” means that the divided plate-making master clamped or wound / held on the plate cylinder gradually shifts upstream in the rotation direction of the plate cylinder as printing progresses. It means to include at least one of “master deviation” and “master elongation” by the master alone.
“During printing” means the same division on the plate cylinder as described above, in addition to forming a print image continuously on a printing medium in a state where a plate cylinder on which the same divided master plate is wound is used. After temporarily stopping printing for some reason (for example, jam processing) in the state of using the pre-printed master, the remaining number of prints can be printed again or the same plate cylinder as above can be used. It is a broad concept term that includes printing for the newly added number of copies in use, or temporarily stopping / interrupting printing to execute top / bottom movement correction (the following claims) The same applies to the term).
The “surface top / bottom movement correction” is a surface print image position correction (or surface print position correction) in which the surface top / bottom movement means is operated to move the position of the surface print image in the transport direction of the print medium (or print medium). In other words, “backside up / down movement correction” refers to backside printing image position correction (or backside printing position correction) in which the backside upside movement means is operated to move the position of the backside printed image in the transport direction of the print medium. In addition, the “front top / bottom movement correction value” means the front surface print image position correction value (or front surface printing position correction value), and the “back side top / bottom movement correction value” means the back surface print image position correction value (or Each means a back surface printing position correction value (the same applies to the following claims).

  According to a second aspect of the present invention, there is provided a plate cylinder for winding a divided plate-making master in which a first plate-making image and a second plate-making image are formed side by side along the rotation direction; Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the first plate-making image and the second plate-making image in the divided plate-making master to the surface of the print medium in the transport direction of the print medium; A back surface that moves a position of a back surface printed image transferred from either one of the first plate making image and the second plate making image on the plate cylinder on the plate cylinder to the back surface of the printing medium in the transport direction of the printing medium. In a double-sided printing apparatus having a top-and-bottom movement unit, a printed-sheet number counting unit that counts the number of printed sheets, a storage unit that stores a front-and-back top-and-bottom movement correction value and a back-and-back top and bottom movement correction value that are set in advance for each predetermined number of printed sheets; The mark Each time the number of printed sheets counted by the sheet number counting means reaches the predetermined number of printed sheets, the front-to-top and bottom-side movement correction values corresponding to the predetermined number of printed sheets are read from the storage unit and printing is in progress. And executing the surface top / bottom movement correction according to the surface top / bottom movement correction value read out by the surface top / bottom movement means and the back surface top / bottom movement correction value read out by the back surface top and bottom movement means. And control means for executing backside up / down movement correction according to the above.

  According to a third aspect of the present invention, in the double-sided printing apparatus according to the second aspect, the control unit counts the number of printed sheets by the printed number counting unit as the number of printed sheets for each sheet within the predetermined printed number range. Each time, from the storage means, the surface top and bottom movement correction value and the back surface top movement correction value corresponding to the predetermined number of prints, and the surface top and bottom movement correction value and back side top and bottom movement correction corresponding to the next predetermined number of prints. The surface top and bottom movement correction value and the back surface top and bottom movement correction value corresponding to the number of prints per sheet are calculated by calculation, and the surface top and bottom movement correction value calculated by the surface top and bottom movement means is calculated. And executing the back surface top and bottom movement correction according to the back surface top and bottom movement correction value calculated by the back surface top and bottom moving means. It is characterized in.

  According to a fourth aspect of the present invention, in the double-sided printing apparatus according to the second aspect, the front-to-back movement correction value and the back-to-back movement correction value have an adjustment value for each master type.

  According to a fifth aspect of the present invention, in the double-sided printing apparatus according to the second aspect, the front-to-top and bottom-side movement correction values have adjustment values for each type of the plate cylinder.

  According to a sixth aspect of the present invention, in the double-sided printing apparatus according to the second aspect of the present invention, the double-sided printing apparatus includes an ink supply unit that supplies ink to the divided plate-making master on the plate cylinder. The correction value has an adjustment value for each ink color used in the plate cylinder.

  According to a seventh aspect of the present invention, in the double-sided printing apparatus according to the second aspect, the front-to-back movement correction value and the back-to-back movement correction value have adjustment values for each printing speed.

  According to an eighth aspect of the present invention, in the double-sided printing apparatus according to the second aspect, the front-to-back movement correction value and the back-to-back movement correction value have an adjustment value for each type of print medium.

  The invention according to claim 9 is the double-sided printing apparatus according to claim 2, further comprising ink supply means for supplying ink to the divided plate-making master on the plate cylinder, wherein the front-to-top movement correction value and the back-to-back movement The correction value has an adjustment value for each ink temperature setting range.

  A tenth aspect of the present invention is the double-sided printing apparatus according to any one of the second to ninth aspects, further comprising a switching unit that switches whether the control unit needs the front-to-top movement correction and the back-to-top movement correction. It is characterized by that.

  The invention according to claim 11 is a plate cylinder around which a divided plate-making master in which two first plate-making images and second plate-making images are arranged side by side in the rotation direction is wound on the plate cylinder. Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the first plate-making image and the second plate-making image in the divided plate-making master to the surface of the print medium in the transport direction of the print medium; A back surface that moves a position of a back surface printed image transferred from either one of the first plate making image and the second plate making image on the plate cylinder on the plate cylinder to the back surface of the printing medium in the transport direction of the printing medium. In a double-sided printing apparatus having a top-and-bottom moving means, a master trailing edge detection means for detecting a trailing edge position of a divided plate-making master on the plate cylinder, and a master trailing edge position data detected by the master trailing edge detection means Surface sky The movement correction value and the back surface vertical movement correction value are calculated by calculation, and during printing, the front surface vertical movement correction according to the surface vertical movement correction value calculated by the front surface vertical movement means is executed, and the back surface And control means for executing backside upside movement correction according to the backside upside movement correction value calculated by the upside down means.

  A twelfth aspect of the invention is the double-sided printing apparatus according to the eleventh aspect, further comprising: a pressing unit that presses a printing medium against the divided plate-making master on the plate cylinder, and the master trailing edge detection unit is configured as the plate cylinder. It arrange | positions in the clamping part vicinity with the said press means, It is characterized by the above-mentioned.

  According to a thirteenth aspect of the present invention, in the double-sided printing apparatus according to the twelfth aspect of the invention, the plate cylinder is provided with an ink-permeable opening, and the master trailing edge detecting means is connected to the plate at the opening. It is characterized by being arranged on the outside in the trunk width direction.

A fourteenth aspect of the present invention is the double-sided printing apparatus according to any one of the eleventh to thirteenth aspects, further comprising a printed sheet counting unit that counts the number of printed sheets, and the control unit includes the printed sheet counting unit. Each time the counted number of printed sheets reaches a predetermined number of preset sheets, the top and bottom movement correction values and the back and top movement correction values are calculated by calculation from the master trailing edge position data detected by the master trailing edge detection means. During the printing, the front-and-back movement correction is performed according to the front-and-back movement correction value calculated by the front-and-back movement unit, and the back-and-top movement calculated by the back-and-bottom movement unit. The back and top movement correction according to the correction value is executed .

  According to a fifteenth aspect of the present invention, in the double-sided printing apparatus according to any one of the eleventh to fourteenth aspects, the control unit is configured to perform the printing after the printing is temporarily stopped and before the printing is started again. The front-to-top / bottom movement correction and the back-to-top / bottom movement correction are executed each time the cylinder is rotated.

  The invention described in claim 16 uses a master on which a display for detecting the master length is provided, and the first plate-making image and the second plate-making image are formed side by side along the rotation direction. A plate cylinder on which a divided plate-making master is wound, and a surface printing image transferred from one of the first plate-making image and the second plate-making image on the divided plate-making master on the plate cylinder to the surface of the printing medium. Transferred from the other one of the first plate-making image and the second plate-making image in the divided plate-making master on the plate cylinder to the back surface of the printing medium. Backside vertical movement means for moving the position of the backside printed image in the transport direction of the printing medium, and when the divided master plate is wound around the plate cylinder, the display is the rotation direction of the plate cylinder Fitted to be placed upstream of A master display detection unit for detecting the display of the divided master-printed master on the plate cylinder, and a front-to-top movement correction value and a back surface from the master length data detected by the master display detection unit. A top-and-bottom movement correction value is calculated, and during printing, the front-to-top movement control value is calculated according to the front-and-top movement correction value calculated by the front-and-bottom movement correction value. Control means for performing backside upside movement correction according to the backside upside movement correction value calculated in this way.

  The invention according to claim 17 is the double-sided printing apparatus according to claim 16, further comprising a pressing unit that presses a printing medium against the divided plate-making master on the plate cylinder, and the master display detection unit includes the plate cylinder and the plate cylinder. It arrange | positions in the clamping part vicinity with a press means, It is characterized by the above-mentioned.

  According to an eighteenth aspect of the present invention, in the double-sided printing apparatus according to the seventeenth aspect of the invention, the plate cylinder is provided with an ink-permeable opening, and the master display detection means is connected to the plate cylinder in the opening. It arrange | positions on the outer side of the width direction, It is characterized by the above-mentioned.

According to a nineteenth aspect of the present invention, in the double-sided printing apparatus according to any one of the sixteenth to eighteenth aspects, the printing unit includes a printed sheet counting unit that counts the number of printed sheets, and the control unit includes the printed sheet counting unit. Every time the counted number of printed sheets reaches a predetermined number of preset sheets, the front and back top and bottom side movement correction values are calculated by calculation from the master length data detected by the master display detecting means, During printing, the surface top / bottom movement correction value is calculated according to the surface top / bottom movement correction value according to the surface top / bottom movement correction value calculated by the surface top / bottom movement means, and the back surface top / bottom movement correction value calculated by the back surface top / bottom movement means. According to the present invention, the back-and-back movement correction is executed .

  According to a twentieth aspect of the present invention, in the duplex printing apparatus according to any one of the sixteenth to nineteenth aspects, the control unit includes the plate after the printing is temporarily stopped and before the printing is started again. The front-to-top / bottom movement correction and the back-to-top / bottom movement correction are executed each time the cylinder is rotated.

  The invention according to claim 21 is a plate making apparatus comprising a plate making means for making a master and a display means for giving a display for detecting the master length to the master, and made in the rotational direction made by the plate making means. A plate cylinder on which a divided plate-making master formed by arranging two first plate-making images and a second plate-making image side by side, a first plate-making image and a second plate-making master in the divided plate-making master on the plate cylinder Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the plate-making images to the surface of the print medium in the transport direction of the print medium, and the first in the divided plate-making master on the plate cylinder A divided plate-making master, comprising: a backside up and down moving means for moving the position of the backside printed image transferred from either one of the platemaking image and the second platemaking image to the back side of the printing medium in the transport direction of the printing medium; Said A double-sided printing apparatus mounted so that the display given by the display means when being wound around a cylinder is arranged on the upstream side in the rotation direction of the plate cylinder, and the divided plate making on the plate cylinder A master display detecting means for detecting the display of the completed master, and calculating a front and back movement correction value and a back and top movement correction value from the master length data detected by the master display detection means, and during printing, The surface top / bottom movement correction according to the surface top / bottom movement correction value calculated by the surface top / bottom movement means is executed, and the back surface top / bottom according to the back surface top / bottom movement correction value calculated by the back surface top / bottom movement means. And control means for executing movement correction.

According to the present invention, a double-sided printing apparatus including the novel double-sided printing method and stencil double-sided printing apparatus can be provided by solving the above-mentioned problems. The effects of the invention for each claim are as follows.
According to the first aspect of the present invention, the front-to-back movement correction value and the back-to-back movement correction value are set in advance in accordance with parameters including the number of printed sheets that affect the misregistration master position deviation in the rotation direction of the plate cylinder. On the basis of the surface top and bottom movement correction value, during the printing, the surface top and bottom movement means is automatically executed to execute the surface top and bottom movement correction. By automatically performing backside up / down movement correction, even if a master position error occurs, the double-sided printing position error is automatically corrected, so a double-sided printed product without a double-sided printing position error can be obtained. In addition, the waste of the master and the print medium can be eliminated, the work time can be shortened, and the work man-hours can be reduced.

  According to the second aspect of the present invention, the control means includes the surface top and bottom movement correction value corresponding to the predetermined number of printed sheets from the storage means every time the number of printed sheets counted by the number of printed sheet counting means reaches the predetermined number of printed sheets. The backside top and bottom movement correction value is read and the top and bottom side moving means is controlled to execute the top and bottom side movement correction according to the read top and bottom side movement correction value during printing. By controlling the backside up / down moving means to execute backside upside down movement correction according to the value, even if the master position deviation occurs, the double sided printing position deviation is automatically corrected. Double-sided printed matter can be obtained, waste of the master and the print medium can be eliminated, work time can be shortened, and work man-hours can be reduced.

  According to the third aspect of the present invention, the control means sets the predetermined number of printed sheets from the storage means each time the number of printed sheets is counted by the number of printed sheet counting means as the number of printed sheets within a predetermined number of printed sheets. From the corresponding top-and-bottom movement correction value and back-and-bottom movement correction value and the next top-and-bottom movement correction value and back-and-bottom movement correction value corresponding to the next predetermined number of prints, the top and bottom movement correction value corresponding to the number of prints per sheet. And calculating the surface top / bottom movement correction value according to the calculated surface top / bottom movement correction value and controlling the surface top / bottom movement means to execute the surface top / bottom movement correction value according to the calculated surface top / bottom movement correction value. By controlling the backside up / down moving means so as to execute the backside upside / downside movement correction in accordance with the above, it is possible to finely adjust the fineness corresponding to the predetermined number of printed sheets for each sheet within the predetermined number of printed sheets. It is possible to perform a high surface top-bottom shift correction and the back top-bottom shift correction.

  According to the invention according to any one of claims 4 to 9, for each type of master, for each type of plate cylinder, for each ink color used for the plate cylinder, for each printing speed, for each type of printing medium or for the ink temperature By having an adjustment value for the top / bottom movement correction value for each setting range, the surface top / bottom movement correction according to the surface top / bottom movement correction value that is closer to the actual machine printing conditions, taking into account and taking into account printing conditions (parameters) other than the number of prints Backside vertical movement correction according to the backside vertical movement correction value can be executed.

  According to the tenth aspect of the present invention, the user can switch whether or not the front-and-back movement correction and the back-and-bottom movement correction by the control means are necessary according to his / her preference and necessity, and the operation and convenience of the duplex printing apparatus. Will improve.

  According to the invention of claim 11, the control means calculates the top and bottom movement correction value and the back and top movement correction value by calculation from the master rear end position data detected by the master rear end detection means, and during printing, Control the surface top / bottom movement means to execute the surface top / bottom movement correction according to the calculated surface top / bottom movement correction value, and perform the back surface top / bottom movement correction according to the calculated back surface top / bottom movement correction value. By controlling the top-and-bottom moving means, even if the master misalignment occurs, the double-sided printing position misalignment is automatically corrected, so that a double-sided printed product without any duplex printing position misalignment can be obtained. It is possible to eliminate wasteful time, shorten work time, and reduce work man-hours.

  According to the inventions of claims 12 and 17, the above configuration makes it possible to accurately detect and measure the rear end position of the divided plate-making master on the plate cylinder in a more stable state. It is possible to execute front-and-back top and bottom movement correction.

  According to the inventions of claims 13 and 18, the configuration described above makes it possible to accurately detect and measure the rear end position of the divided plate-making master on the plate cylinder in a more stable state. Thus, it is possible to execute the front and top movement correction and the back and top movement correction.

  According to the inventions of claims 14 and 19, with the above configuration, the control means performs the above calculation for each printed sheet, and the surface top / bottom movement correction command according to the calculated surface top / bottom movement correction value and It is not necessary to issue a backside up / down movement correction command according to the calculated backside up / down movement correction value, and the control operation can be simplified.

  According to the fifteenth and twentieth aspects of the invention, with the above-described configuration, it is possible to execute the front-to-back movement correction and the back-to-back movement correction using the idle rotation of the plate cylinder.

  According to the sixteenth aspect of the invention, the control means calculates the top and bottom top movement correction value and the back top and bottom movement correction value from the master length data detected by the master display detection means, and is calculated during printing. The top and bottom surface movement means is controlled to execute the top and bottom surface movement correction according to the corrected top and bottom surface movement correction value, and the back and top surface movement is performed to execute the back and top surface movement correction according to the calculated back and top surface movement correction value. By controlling the means, even if a master misalignment occurs, the double-sided printing position misalignment is automatically corrected, so that a double-sided printed product with no misprinting position can be obtained, and waste of the master and print medium is eliminated. At the same time, the work time can be shortened and the number of work steps can be reduced.

  According to the invention described in claim 21, a plate making means for making a master and a plate making apparatus comprising a display means for giving a display for detecting the master length to the master, and the plate making means made by the plate making means along the rotation direction. A plate cylinder on which the divided plate-making master formed by arranging the first plate-making image and the second plate-making image side by side, and the first plate-making image and the second plate-making master in the divided plate-making master on the plate cylinder Surface top and bottom moving means for moving the position of the surface print image transferred from any one of the plate making images to the surface of the print medium in the transport direction of the print medium, and the first plate making in the divided plate making master on the plate cylinder Backside top moving means for moving the position of the back surface printed image transferred from either the image or the second plate making image to the back surface of the printing medium in the transport direction of the printing medium, Wrap around the plate cylinder The double-sided printing apparatus is mounted so that the display given by the display means is arranged on the upstream side in the rotation direction of the plate cylinder, and the control means has a master length detected by the master display detection means. The surface top / bottom movement correction value and back surface top / bottom movement correction value are calculated by calculation, and the surface top / bottom movement means is controlled to execute the surface top / bottom movement correction according to the calculated surface top / bottom movement correction value during printing. In addition, by controlling the back / upper side movement means to execute the back / upper side movement correction according to the calculated back side / upper side movement correction value, even if the master position deviation occurs, the duplex printing position deviation is automatically performed. Because it is corrected, it is possible to obtain a double-sided printed product with no misalignment in double-sided printing, eliminating waste of the master and print media, shortening work time, and reducing work man-hours. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention (hereinafter referred to as “embodiments”) including the best mode for carrying out the invention and examples will be described below with reference to the drawings. The constituent elements (members and constituent parts) having the same functions and shapes in the respective embodiments and modifications will be omitted by giving the same reference numerals after the description. In the figure, components that are configured in a pair and do not need to be specifically distinguished and described are described by appropriately describing one of them for the sake of simplification of description. In order to simplify the drawings and the description, even if the components are to be represented in the drawings, the components that do not need to be specifically described in the drawings may be omitted as appropriate. When quoting and explaining constituent elements such as published patent gazettes, the reference numerals are shown in parentheses to distinguish them from those of the embodiments.

(First embodiment)
FIG. 1 shows the overall configuration of a stencil duplex printing apparatus 1 as an example of a duplex printing apparatus according to the first embodiment of the present invention. First, mainly referring to FIG. 1, the overall configuration of the stencil duplex printing apparatus 1 will be briefly described.
As shown in the figure, the stencil duplex printing apparatus 1 includes a divided master-making master 65 for double-sided printing in which a first plate-making image and a second plate-making image are formed side by side along the rotation direction (see FIG. 6) and a printing unit 2 having a press roller 13 as a pressing means 13 that can be moved toward and away from the plate cylinder 12 relative to the plate cylinder 12 and a master 64 according to image information. Then, a master conveying means such as a thermal head 59 and a platen roller 58 as a plate making means for producing a divided master making master 65 (see FIG. 6) for double-sided printing or a master making master 66 for single-sided printing (see FIG. 7). The plate making unit 3 having a reverse roller pair 63 as plate feeding means for feeding the divided plate making master 65 or the plate making master 66 to the plate cylinder 12 and the sheet feeding tray 67 serving as a sheet feeding table are stacked. Printing medium As an example, a paper feeding unit 4 that feeds the paper P toward the printing unit 2, a plate discharging unit 5 that peels and removes the used master 64 c on the plate cylinder 12, and a printed version printed by the printing unit 2 A paper discharge unit 6 that discharges the paper PB onto a paper discharge tray 86 serving as a paper discharge stand, an image reading unit 7 that reads image information of a document, and a printed surface on which a print image is formed in the printing unit 2 An auxiliary tray 8 serving as a refeed storage means for temporarily storing the paper PA is provided, and the front surface printed paper PA stored in the auxiliary tray 8 is reversed by the rotation of the press roller 13 and reprinted toward the printing unit 2. A sheet re-feeding means 9 for feeding paper, and a switching member 10 as a switching means for guiding the surface-printed paper PA or printed paper PB that has passed through the printing unit 2 to the auxiliary tray 8 or the paper discharge unit 6. ing. In the figure, reference numeral 11 denotes a device main body on which the above-described parts and devices are mounted and which forms the framework.

  Of the above-described units and devices constituting the stencil duplex printing apparatus 1, the plate discharging unit 5 and the image reading unit 7 are related to, for example, FIG. 1 of Japanese Patent Application Laid-Open No. 2003-200355 and Japanese Patent Application Laid-Open No. 2004-196476 and the like. Since it is the same as that of the structure currently disclosed by each paragraph, the description is abbreviate | omitted. The configuration of the printing unit 2, the plate making unit 3, the paper feeding unit 4, and the paper discharging unit 6 necessary for understanding and implementing the present invention will be appropriately described.

In addition to the above configuration, the stencil duplex printing apparatus 1 has the operation panel 103 shown in FIG. 9 for operating the stencil duplex printing apparatus 1, which will be described in detail later. 10 for controlling the operation, etc., surface top and bottom moving means 250 including a top and bottom moving motor 259 as a surface top and bottom movement driving means shown in FIG. 8, and the refeed resist shown in FIG. It also includes a roller 23 and a backside up / down moving means equipped with the solenoid 33 and the like shown in FIGS. 2, 5 and 10.

The printing unit 2 is disposed substantially in the center of the apparatus main body 11 and includes a plate cylinder 12 and a press roller 13 as a pressing unit. The plate cylinder 12 and the press roller 13 are each single. Hereinafter, in this specification, the printing drum including the printing drum is referred to as a plate cylinder, and the printing paper is also simply referred to as “paper”.
The plate cylinder 12 includes a pair of end plates (not shown) rotatably supported on a support shaft 14 that also serves as an ink supply pipe, a porous support plate (not shown) wound and fixed on the outer peripheral surface of each end plate, It is mainly composed of a mesh screen (not shown) wound around the outer peripheral surface of a porous support plate (not shown). The plate cylinder 12 has plate cylinder driving means 121 (see FIG. 10, for example, a main motor comprising a DC motor) provided with a motor drive circuit (not shown) so that the rotation speed can be changed corresponding to a plurality of printing speeds. ). The plate cylinder 12 constitutes a plate cylinder unit together with an ink supply means 15 and the like to be described later, and is detachable from the apparatus main body 11. In the present embodiment, the plate cylinder 12 has a size capable of obtaining a printed matter of A3 size at the maximum during single-sided printing.

An ink supply means 15 is disposed inside the plate cylinder 12. The ink supply means 15 includes a support shaft 14, an ink roller 16, a doctor roller 17, and the like. The ink roller 16 is rotatably supported between side plates (not shown) provided in the plate cylinder 12, and the peripheral surface thereof is disposed close to the inner peripheral surface of the plate cylinder 12. It is rotationally driven in the same direction as the barrel 12. The doctor roller 17 is also supported rotatably between the side plates, and its peripheral surface is disposed close to the peripheral surface of the ink roller 16, and is driven to rotate in a direction opposite to the plate cylinder 12 by a driving means (not shown). . A plurality of small holes are formed in the support shaft 14, and the ink supplied from the support shaft 14 accumulates in a substantially wedge-shaped space formed between the ink roller 16 and the doctor roller 17. A reservoir 18 is formed.
The ink in the ink reservoir 18 passes through a predetermined gap between the ink roller 16 and the doctor roller 17 and is supplied in a layered manner to the outer peripheral surface of the ink roller 16. The ink supplied to the outer peripheral surface of the ink roller 16 is pressed against the inner peripheral surface of the plate cylinder 12 and the ink roller 16 when the outer peripheral surface of the plate cylinder 12 is pressed by the press roller 13. The paper is supplied to the inner peripheral surface, exudes from the opening of the plate cylinder 12, and is transferred / transferred onto the paper P fed from the paper feeding unit 4. As the ink, for example, W / O type emulsion ink is preferably used.

  Inside the plate cylinder 12, a temperature sensor 301 is disposed as an ink temperature detecting means that is disposed in the ink reservoir 18 forming portion of the ink supply means 15 and detects the temperature of the ink. As the temperature sensor 301, for example, a thermistor that has been conventionally used for adjusting plate-making energy is also used.

  On the outer peripheral surface of the plate cylinder 12, a stage portion 19 a is formed that extends in the length direction of the support shaft 14 along one generatrix of the plate cylinder 12 and forms a flat surface. On the stage portion 19a, a clamper 19b as a holding means for holding the leading end portion of the master is disposed so as to be openable and closable, and the master can be wound around the outer peripheral surface of the plate cylinder 12. When the plate cylinder 12 is rotated to a predetermined rotation position, that is, the clamper 19b, that is, a plate feeding position for feeding the divided plate-making 65 or the plate-making master 66, and a plate discharging position for peeling the used master 64c on the plate cylinder 12. When the home position, which is the initial position, is occupied, it is opened and closed by an opening / closing means (not shown).

A press roller 13 is disposed below the plate cylinder 12 so as to face the ink roller 16. The press roller 13 also has a function of holding the print image surface side of the surface-printed paper PA so as to be in contact with the surface, inverting it while rotating, and transporting it to the plate cylinder 12.
The press roller 13 is configured by winding an oil-resistant elastic body such as nitrile rubber (NBR) or the like around a metal core portion 13 a and extending in the axial direction of the plate cylinder 12. It has been. At least the outer peripheral surface of the rubber of the press roller 13 is a film having a fine uneven surface treatment, for example, glassy material similar to that used for preventing smearing of printed matter, for example, in an offset printing machine, etc. Glass beads as fine particles are uniformly coated or adhered. Not only glassy fine particles but also ceramic fine particles may be used. Thus, swelling due to contact with the outer peripheral surface of the plate cylinder 12 or the divided plate-making master 65 or the plate-making master 66 on the plate cylinder 12 or with the ink on the printed image surface side of the surface-printed paper PA. In addition, the ink stain is minimized.
As shown in FIG. 2, the press roller 13 is rotatably supported by a pair of arm members 20 (the front side of the paper is omitted) at both ends on the front side and the back side of the core portion 13 a. Each arm member 20 having a substantially L shape is integrated by a swing shaft 21 attached to a portion near the bent portion. The swing shaft 21 is supported by the apparatus main body 11 so as to be rotatable within a range of a predetermined angle. The pair of arm members 20 are configured to be displaceable so as to rotatably support the press roller 13 and to allow the press roller 13 to contact and separate from the plate cylinder 12.

2 and 5, in addition to the press roller 13, a refeed guide member 22, a refeed resist roller 23, a refeed resist roller contact / separation mechanism 160, and a refeed are provided between the arm members 20. A paper positioning member 24, a paper refeeding conveyance unit 25, a cleaning roller 26, a guide plate 27, and the like are provided. The cleaning roller 26 and the guide plate 27 are the same as those described in paragraphs “0049” to “0050” of Japanese Patent Application Laid-Open No. 2004-196476.
Among the configurations described above, the auxiliary tray 8, the refeed guide member 22, the refeed resist roller 23, the refeed resist roller contact / separation mechanism 160, the refeed positioning member 24, the refeed transport unit 25, and the press roller. 13 constitutes a sheet refeeding means 9.
The paper refeeding means 9 is shown in FIGS. 16 and 17 of Japanese Patent Application Laid-Open No. 2004-26373, for example, instead of the paper receiving plate 40 as the paper contact preventing means (paper contact preventing member) shown in FIGS. It is preferable to use the sheet receiving plate (141) and its driving mechanism. Moreover, you may use the movement guide (81) and movement means (87) which are shown by FIGS. 1-9 of Unexamined-Japanese-Patent No. 2005-262730.

The re-feeding guide member 22 is disposed in the vicinity of the right side of the press roller 13, and is directed toward the plate cylinder 12 while contacting and holding the conveyed surface-printed paper PA on the outer peripheral surface of the press roller 13. I will guide you. The re-feeding guide member 22 is integrally provided on each of the support shafts 28 a, 29 a, 30 a, and a plurality of roller-shaped rollers 28, 29, 30 having their respective peripheral surfaces pressed against the outer peripheral surface of the press roller 13. And a paper guide plate 31 formed in a curved shape for causing the surface-printed paper PA to follow the outer peripheral surface of the press roller 13. Each support shaft 28a, 29a, 30a is rotatably supported by each arm member 20 at both ends, and is urged toward the core portion 13a by urging means such as a spring (not shown). Each of the rollers 28, 29, and 30 is integrally attached to the corresponding support shaft 28 a, 29 a, 30 a with a predetermined interval over substantially the entire width of the press roller 13.
The sheet guide plate 31 is disposed at a position away from the outer peripheral surface of the press roller 13 by a predetermined distance that is smaller than the radius of each of the rollers 28, 29, and 30. It is fixed. The paper guide plate 31 is formed to have a curved surface centered on the core portion 13 a, and the paper guide plate 31 has the peripheral surfaces of the rollers 28, 29, 30 in contact with the outer peripheral surface of the press roller 13. A plurality of openings (not shown) are formed.

  A re-feeding registration roller 23 is disposed on the downstream side in the transport direction of the surface-printed paper PA transported by the re-feed transport unit 25 and below the press roller 13. The re-feeding registration roller 23 is pressed against the outer peripheral surface of the rotating press roller 13 with a predetermined pressing force on the surface-printed paper PA conveyed by the re-feeding conveyance unit 25, as indicated by a solid line in FIG. It has a function as a press contact means that can be displaced between the position and the separated position shown by a two-dot chain line in FIG. 2 that is separated from the outer peripheral surface of the press roller 13.

  In FIG. 2, reference numeral 160 denotes a re-feeding registration roller contact / separation mechanism. The re-feeding registration roller contact / separation mechanism 160 mainly includes a support shaft 23 a, a swing arm 32, a support shaft 32 a, a solenoid 33, and a tension spring 34. The re-feeding registration roller contact / separation mechanism 160 has a function of displacing the re-feeding registration roller 23 between a press-contact position indicated by a solid line in the figure and a separation position indicated by a two-dot chain line in the figure. It also has a function as a back-and-forth moving means. Note that the pressure contact force applied to the outer peripheral surface of the press roller 13 via the front surface printed paper PA by the re-feeding registration roller 23 is the pressure contact force applied to the front surface of the paper P and the back surface of the front surface printed paper PA by the press roller 13. It is set small compared with.

The re-feeding registration roller 23 has a roller shape and is rotatably supported by the support shaft 23a. The support shaft 23a is attached to one end of a swinging arm 32 having a substantially hemi-shaped shape. The swing arm 32 is supported by a support shaft 32a fixed between the arm members 20 so that the bent portion can swing freely. The position at which the swing arm 32 is disposed is determined so that the refeed resist roller 23 is positioned at a substantially central portion in the width direction of the press roller 13 and is located at an intermediate position between the rollers 30. It has been.
A plunger 33a of a solenoid 33 is attached to the other end of the swing arm 32 via a pin. The solenoid 33 is attached and fixed to one arm member 20 via a bracket (not shown). Further, the other end of the swing arm 32 is fixed to one arm member 20, and a biasing force that rotates counterclockwise in FIG. 2 is applied to the swing arm 32 about the support shaft 32a. The other end of the tension spring 34 is attached. The solenoid 33 has a function as a pressure contact driving means and a backside upside movement drive means for displacing the re-feeding registration roller 23 at a predetermined timing so as to occupy the pressure contact position.
As described above, when the solenoid 33 is operated against the urging force of the tension spring 34 (ON operation), the outer periphery of the re-feeding registration roller 23 is pressed against the outer periphery of the press roller 13 with a predetermined pressure contact force. When the operation of the solenoid 33 is released (off operation) by pressing against the surface, the outer peripheral surface is separated from the outer peripheral surface of the press roller 13 by the urging force of the tension spring 34 and occupies the separated position.

A refeed conveyance unit 25 is disposed on the lower left side of the press roller 13. The refeed conveyance unit 25 includes a conveyance unit main body 35, a driving roller 36, a driven roller 37, an endless belt 38, a suction fan 39, and the like. The auxiliary tray 8 is integrally provided on the upper part of the transport unit main body 35.
The transport unit main body 35 is formed so that the upper surface thereof is opened and the width thereof is slightly smaller than the interval between the arm members 20, and has a substantially casing shape. The transport unit main body 35 has bearings (not shown) on both the upstream and downstream sides in the paper transport direction, and these bearings rotatably support the drive shaft 36a and the driven shaft 37a, respectively. Both ends of the drive shaft 36a penetrate both side surfaces of the conveying member main body 35, and both end portions of the penetrated drive shaft 36a are rotatably supported by bearing members (not shown) provided in the apparatus main body 11. ing. A drive gear (not shown) is attached to one end of the drive shaft 36a, and the drive shaft 36a is rotationally driven by a transport unit drive motor 122 (see FIG. 10) connected through the drive gear. The transport unit drive motor 122 is fixed to the apparatus main body 11. The driven shaft 37 a is configured such that both end portions thereof do not penetrate both side surfaces of the transport unit main body 35.

Bosses 35a are integrally provided on both outer sides of the upstream end of the transport unit body 35 in the paper transport direction, and each boss 35a is loosened in a long hole (not shown) formed in each arm member 20. It is mated. With this configuration, the transport unit main body 35 is centered on the drive shaft 36a along with the swing of each arm member 20 when the press roller 13 is brought into and out of contact with the plate cylinder 12 by a press roller contact / separation mechanism 55 described later. Can be swung.
The drive roller 36 has a plurality of rollers and is integrally attached to the drive shaft 36a. A predetermined interval is provided between the drive rollers 36. The driven roller 37 has a plurality of roller shapes like the driving roller 36 and is integrally attached to the driven shaft 37 a at the same interval as each driving roller 36. An endless belt 38 is stretched between each driving roller 36 and each corresponding driven roller 37 corresponding thereto with a predetermined tension. The endless belt 38 is made of a friction resistance member, and is moved and rotated in the direction indicated by the arrow in FIG. 2 when the drive shaft 36a is rotationally driven by the transport unit drive motor 122.
The endless belt 38 has a function as a refeed conveyance unit that conveys the surface-printed paper PA temporarily stored on the auxiliary tray 8 toward the press roller 13.
The transport unit drive motor 122 has a function as a refeed transport driving unit that drives the endless belt 38 as a refeed transport unit at a predetermined timing via the drive gear, the drive shaft 36a, and the drive roller 36.

  A suction fan 39 is integrally attached to the lower surface of the transport unit main body 35, and the auxiliary tray 8 is integrally attached to the upper surface of the transport unit main body 35. As shown in FIG. 3, the auxiliary tray 8 is configured such that a part of the peripheral surface of each of the rollers 36 and 37 faces the sheet conveying surface. A large number of apertures 8b are formed on both side portions of each endless belt 38 on the sheet conveying surface of the auxiliary tray 8. Two end fences 8a for receiving one end of the front surface printed paper PA sent from the printing unit 2 are integrally provided at the downstream end (left side in FIG. 2) of the auxiliary tray 8 in the paper conveyance direction. It has been.

  As shown in FIGS. 1 to 3 and 5, the auxiliary tray 8 is re-supplied to the printing unit 2 by the re-feed transport unit 25 at the upstream end (the right side in FIGS. 1 to 3) in the paper transport direction. A re-feeding positioning member 24 is provided for temporarily stopping the other end of the printed surface PA to be printed at a fixed position. As shown in FIG. 3, two are provided, and each is integrally attached to the auxiliary tray 8. Further, the auxiliary tray 8 is provided with a sensor 8c as a surface printed paper detection unit that detects that the other end of the surface printed paper PA is close to the refeed positioning member 24. The sensor 8c is composed of, for example, a reflection type photosensor, and outputs a signal to the control means 129 shown in FIG. 10 when the other end of the front surface printed paper PA is detected.

  A hole (not shown) is provided in the lower surface of the transport unit main body 35, which is a mounting surface of the suction fan 39, and the suction fan 39 is activated by this so that a negative pressure is generated inside the transport unit main body 35, which is a housing. And the surface-printed paper PA is sucked onto the upper surface of each moving endless belt 38. The suction force of the suction fan 39 and the frictional resistance force of the endless belt 38 are determined between the surface-printed paper PA and each endless belt 38 when the other end of the surface-printed paper PA comes into contact with the refeed positioning member 24. Each is set to a strength that causes slippage between them.

  As shown in FIGS. 2 and 5, on the other end side of each arm member 20 opposite to the one end side where the press roller 13 is supported, rotatable cam followers 41 are arranged so as to face each other. ing. Further, the other end of the printing spring 42 having one end fixed to the apparatus main body 11 is attached in the vicinity of each arm member 20 at the position where the cam follower 41 is disposed. Thus, one end side and the other end side of each arm member 20 are respectively given a rotational biasing force in the clockwise direction in FIG. In the vicinity of the left side of each cam follower 41, a known multistage cam 43 having three cam plates 43A, 43B, 43C is disposed.

The multistage cam 43 shown in FIG. 4 is the same as that described in paragraphs “0052” to “0053” of Japanese Patent Application Laid-Open No. 2004-196476, for example. The description is omitted because it is the same as described in paragraph [0054] of FIG. The moving arm 48 and the step cam 49 shown in FIG. 4 are the same as those described in the paragraphs “0055” to “0058” of the same publication.
A press roller contact / separation mechanism 55 is constituted by the cam follower 41, the printing pressure spring 42, the multi-stage cam 43, a press roller locking means (not shown), the moving arm 48, and the step cam 49. The press roller 13 selectively occupies the separation position (non-printing position) shown in FIG. 2 and the pressing position (printing position) shown in FIG.

A well-known switching member 10 for switching the transport path of the paper P is disposed on the transport path of the paper P on the left side of the contact position between the plate cylinder 12 and the press roller 13. The switching member 10 has a first position indicated by a solid line in FIG. 1 and a second dotted line indicated by a two-dot chain line at the upstream end in the sheet conveying direction formed with an acute cross section when a solenoid 123 (see FIG. 10) is actuated. Are selectively positioned.
When the switching member 10 occupies the first position, its front end is close to the outer peripheral surface of the press roller 13 and is positioned so as not to interfere with the clamper 19b on the plate cylinder 12 and occupies the second position. The tip of the plate cylinder 12 is placed close to the peripheral surface of the plate cylinder 12. The surface-printed paper PA that has passed between the plate cylinder 12 and the press roller 13 is guided to the paper discharge unit 6 when the switching member 10 occupies the first position, and the switching member 10 is in the second position. Is guided to the auxiliary tray 8 through the space between the guide plate 27 and the guide plate 56 fixed to the apparatus main body 11.

A well-known plate making unit 3 is disposed in the upper right part of the apparatus main body 11. The plate making unit 3 includes a master holding member 57, a platen roller 58, a thermal head 59, a cutting means 60, a master stock unit 61, a tension roller pair 62, a reverse roller pair 63, and the like. Each component of the plate making unit 3 is the same as described in paragraphs “0063” to “0069” of Japanese Patent Application Laid-Open No. 2004-196476.
The plate making unit 3 performs plate making on the master 64 and has a first plate making image 65A and a second plate making image 65B as shown in FIG. 6 arranged in this order in the master conveyance direction which is also the rotation direction of the plate cylinder 12. The pre-manufactured master 65, or the pre-manufactured master 66 having the third plate-making image 66A having image areas for two surfaces of the first plate-making image 65A and the second plate-making image 65B as shown in FIG. The first plate-making image 65A is formed at a position corresponding to the front surface area shown in FIG. 1 when the divided master-making master 65 is wound on the outer peripheral surface of the plate cylinder 12, and the second plate-making image 65B is a back surface area. It is formed at the corresponding position.

  In the stencil printing, printing is performed by transferring and transferring directly from the perforated portion of the master on which ink has been made to the paper P, so that the first plate making image 65A and the second plate making image 65B of the divided plate making master 65 and the plate making have been completed. The third plate-making image 66A of the master 66 is a mirror image as shown in FIGS. 6 and 7, the first platemaking image 65A and the second platemaking image 65B of the divided platemaking master 65, and the third platemaking image 66A of the platemaking master 66 are the thermoplastic resin film surface side of the master that is in contact with the paper P. The state seen from.

  As the master 64 used in the present embodiment, for example, a laminate in which a thermoplastic resin film and a porous support (base) made of Japanese paper fiber or synthetic fiber or a mixture of Japanese paper fiber and synthetic fiber are bonded together. The thermoplastic resin film having a structure is, for example, a polyethylene terephthalate (PET) type film. Generally, the master 64 used in the stencil printing apparatus has a thickness in the range of 20 to 60 μm, and the thermoplastic resin film has a thickness in the range of 1.0 to 2.5 μm. The remaining thickness is borne by the porous support.

  The master 64 used in the stencil printing apparatus is not limited to the one used in the present embodiment, and as shown as a master type in FIG. A master of B (endurance) specification having excellent printing durability and a master of C (cost reduction) manufactured by giving priority to cost over the number of printing durability and image quality are also used. Further, the master may be a master having a thin porous support, for example, a synthetic fiber base master (2) as described in JP-A No. 11-77949, or a synthetic resin film. It is also possible to use a master in which a molten resin is applied and a resin film is integrally formed on a synthetic resin film, or a master that is substantially composed only of a thermoplastic resin film.

A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a paper feed tray 67, a paper feed roller 68, a separation roller 69, a separation pad 70, a registration roller pair 71, and the like.
The sheet feed tray 67 has a configuration as a sheet feed table on which a large number of sheets P can be stacked, is supported by the apparatus main body 11 so as to be movable up and down, and includes a lifting motor as a lifting means (not shown). It is moved up and down by the paper feed driving means 125 (see FIG. 10). The paper feed tray 67 can vertically place A3 size paper P as the maximum size paper P used in the stencil duplex printing apparatus 1, and a paper transport direction is provided on the upper surface of the paper feed tray 67 by a rail member (not shown). A pair of side fences 72 are provided that are supported so as to be movable in the paper width direction orthogonal to the horizontal direction. A plurality of paper size detection sensors 73 for detecting the size of the stacked paper P are provided on the free end side of the paper feed tray 67.

  The paper P on the paper feed tray 67 shown in FIG. 1 is the size of the first plate making image (front image) and the second plate making image (back image) in the divided plate making master 65, which will be described in detail in the plate making operation described later. For example, A4 size paper is loaded as the corresponding paper size. That is, when the paper P of the maximum printing size at the time of single-sided printing is A3 size, for example, that of the maximum printing size at the time of double-sided printing is roughly A4 size, and the maximum sheet passing size is also A4 size. The paper passing direction is the short side direction, that is, the paper is passed horizontally in A4 size.

Above the paper feed tray 67, a paper feed roller 68 having a high frictional resistance member on its surface is disposed. The paper feed roller 68 is rotatably supported by a bracket (not shown) that is swingably supported by the apparatus main body 11, and is supplied with a predetermined pressure contact force when the paper feed tray 67 is raised by a lifting means (not shown). The uppermost sheet P on the paper tray 67 is pressed against. The paper feed roller 68 is rotationally driven by the paper feed drive means 125 and sends out the paper P on the paper feed tray 67 in the paper transport direction.
On the left side of the paper feed roller 68, a separation roller 69 and a separation pad 70 each having a high friction resistance member on each surface are disposed. The separation roller 69 is drivingly connected to the paper feed roller 68 via a timing belt 69a, and is driven to rotate in the same direction in synchronism with the rotation of the paper feed roller 68. The separation pad 70 is pressed against the separation roller 69 by a biasing force of a biasing means such as a spring (not shown), and the sheets P sent out by the paper feeding roller 68 by the cooperative action with the separation roller 69 one by one. Separate and feed in the paper transport direction.

  On the left side of the separation roller 69 and the separation pad 70, a registration roller pair 71 as a registration unit is disposed. The registration roller pair 71 includes a driving roller 71a and a driven roller 71b. The rotational driving force from the plate cylinder driving unit 121 is transmitted by a driving force transmitting unit (not shown) such as a gear or a cam, whereby the driving roller 71a is moved to the plate. The paper P is rotated at a predetermined timing synchronized with the cylinder 12 and is fed to the printing unit 2 at a predetermined timing by a driven roller 71b pressed against the driving roller 71a. Reference numerals 136 and 137 denote paper feed guide plates for guiding the conveyance of the paper P fed from the paper feed unit 4 to the printing unit 2.

The rotational driving of the paper feeding roller 68 and the separation roller 69 is not limited to the plate cylinder driving means 121 but is a paper feeding motor including a stepping motor as a motor driven by, for example, pulse input provided independently of this. You may go. Similarly, the rotational driving of the registration roller pair 71 is not limited to the plate cylinder driving unit 121 but may be performed by a registration motor including a stepping motor as a motor driven by a pulse input provided independently of the plate cylinder driving unit 121. . The connection between the sheet feeding motor and the separation roller 69 and the connection between the registration motor and the driving roller 71a may be performed via driving force transmission means such as a timing belt and a timing pulley.
In particular, when the registration roller pair 71 is rotationally driven by a registration motor composed of a stepping motor, the timing for feeding the paper P between the plate cylinder 12 and the press roller 13 is a relatively simple control configuration (described later). Thus, each of the plate-making master 66 and the divided plate-making master 65 on the plate cylinder 12 without stopping the plate cylinder 12 can be executed by detecting the rotation angle and the rotation position of the plate cylinder 12. There is an advantage that the position adjustment of the sheet P in the sheet conveyance direction with respect to the plate-making image, that is, the surface top-and-bottom movement adjustment of the surface printing image can be easily and reliably performed.

  A well-known plate discharging unit 5 is disposed on the upper left side of the printing unit 2. The discharged plate portion 5 includes an upper discharged plate member 74, a lower discharged plate member 75, a discharged plate box 76, a compression plate 77 and the like, which are described in paragraphs “0077” to “0078” of Japanese Patent Application Laid-Open No. 2004-196476. Since this is the same as that described above and is not related to the present invention, the description thereof is omitted.

A well-known paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 84, a paper discharge conveyance unit 85, a paper discharge tray 86, and the like, as described in paragraphs “0079” to “0081” of Japanese Patent Application Laid-Open No. 2004-196476. Since the configurations other than those described below are not related to the present invention, the description thereof will be omitted.
In other words, in the vicinity of the lower opening between the plurality of endless belts 89 in the paper discharge transport unit 85, a paper discharge sensor 150 is disposed as a print number counting means for counting the number of prints printed on the paper P by the printing unit 2. ing. The paper discharge sensor 150 is formed of, for example, a reflection type photosensor, and also serves as a paper discharge detection unit that detects whether or not the paper P is wound around the plate cylinder 12 and a paper discharge error.
The number-of-print-counting means is not limited to the paper discharge sensor 150, and is fed by detecting the rotation count of the paper feed motor, the leading edge of the paper P disposed in the paper transport path of the paper feed unit 4, and the like. For example, a sheet sensor (a well-known paper feed sensor, registration sensor, or the like) that counts the number of sheets P or the number of times the press roller 13 is swung or lifted in the printing unit 2 may be counted.

  A known image reading unit 7 is disposed on the upper part of the apparatus main body 11. The image reading unit 7 includes a contact glass 93 on which a document is placed, a pressure plate 94 provided so as to be able to come in contact with and away from the contact glass 93, reflection mirrors 95, 96, 97, 98 for scanning and reading a document image, and a fluorescent lamp. 99, a lens 100 that focuses a scanned document image, an image sensor 101 such as a CCD (charge coupled device) that processes the focused image, a plurality of document size detection sensors 102 that detect the size of the document, and a read image An image memory 136 or the like for storing data is provided, and the document image reading operation is performed by the operation of the reading drive means 128 (see FIG. 10).

A configuration (phase timing generation method) for detecting the rotational speed and rotational angle position (rotational position) of the plate cylinder 12 will be described with reference to FIG. As shown in FIG. 1, a phase timing detection plate 134 is fixedly provided on the outer surface of the end plate (not shown) on the front side of the paper cylinder 12 and on the back side of the paper surface of the plate cylinder 12. A home position sensor 135 for detecting the home position of the plate cylinder 12 is fixed to the apparatus main body 11 in the vicinity of the periphery of the plate cylinder 12 where the phase timing detection plate 134 is attached. The home position sensor 135 is a light transmission type optical sensor. When the plate cylinder 12 occupies the rotational position where the clamper 19b faces the press roller 13, that is, when the plate cylinder 12 occupies the home position, the home position sensor 135 engages with the phase timing detection plate 134 to be described later. A phase timing signal is output to the means 129.
On the other hand, an encoder plate 151 having a large number of slits is attached to an output shaft of a main motor made of, for example, a DC motor as the plate cylinder driving means 121 shown in FIGS. A plate cylinder rotation angle sensor 152 composed of a photo interrupter (transmission type optical sensor) that holds the encoder plate 151 at a predetermined interval is disposed in the apparatus main body 11 in the vicinity of the encoder plate 151. The plate cylinder rotation angle sensor 152 detects the number of pulses generated in cooperation with the rotation operation of the encoder plate 151 by the rotation driving of the plate cylinder driving means 121 (the main motor), thereby rotating the rotation angle ( Rotation amount) and rotation speed, that is, printing speed is detected.

  Next, the operation panel 103 for operating the stencil duplex printing apparatus 1 will be described with reference to FIG. The operation panel 103 is disposed on the upper front surface of the apparatus main body 11. As shown in the figure, the operation panel 103 includes a plate making start key 104, a printing start key 105, a test printing key 106, a continuous key 107, a clear / stop key 108, a numeric key 105, an enter key 110, a program key 111, a mode. A clear key 112, a printing speed setting key 113, a four-direction key 114 as a front image position adjustment key and a four-direction key 214 as a back image position adjustment key, a paper size setting key 115, a duplex printing key 117, a simplex printing key 118, It has a printing speed display device 113A made up of LEDs (light emitting diodes), a display device 119 made up of 7-segment LEDs, a display device 120 made up of an LCD (liquid crystal display device), and the like.

  The plate making start key 104 is pressed when the stencil duplex printing apparatus 1 performs the plate making operation. When the plate making start key 104 is pressed, the plate making operation is performed after the plate discharging operation and the document reading operation are performed. The stencil duplex printing apparatus 1 is put into a printing standby state by performing the printing operation. The print start key 105 is pressed when the stencil duplex printing apparatus 1 performs a printing operation. When the stencil duplex printing apparatus 1 enters a print standby state and various printing conditions are set, the print start key 105 is pressed. A printing operation is performed. The trial printing key 106 is pressed when the stencil duplex printing apparatus 1 performs trial printing, and only one sheet is printed by pressing the trial printing key 106 after various conditions are set. The continuous key 107 is pressed before pressing the plate making start key 104 when performing the plate making operation and the printing operation continuously. After pressing the continuous key 107, the printing plate start key 104 is pressed after the printing conditions are input. Then, the printing operation is performed following the plate discharging operation, the document reading operation, and the plate making operation.

The clear / stop key 108 is pressed when the operation of the stencil duplex printing apparatus 1 is stopped or when the numerical value is cleared, and the numeric keypad 105 is used for numerical input. The enter key 110 is pressed when setting numerical values or the like when setting various printing conditions, and the program key 111 is pressed when registering or calling a frequently performed operation. The mode clear key 112 is pressed to clear various modes and return to the initial state.
The print speed setting key 113 is pressed when setting the print speed prior to the printing operation, and when it is desired to obtain a darker image or when the ambient temperature is low, the print speed is slowed down. If the ambient temperature is high, set the printing speed fast. The printing speed setting key 113 includes a speed down key 113a for setting the printing speed to the slower side and a speed up key 113b for setting the printing speed to the higher side.
In the printing speed display device 113A, the “printing speed: 3rd speed” with the black coating color displayed in the center of the printing speed is a standard printing speed corresponding to the printing speed normally used, and the speed is reduced. It is automatically set when the key 113a or the speed up key 113b is not pressed. For example, the leftmost “printing speed: 1st speed” displayed as “slow” is the lowest printing speed of 60 sheets / min: 60 rpm, and the printing speed is increased from 2nd speed to 5th speed in order toward the right side. Correspondingly, 15 pages / min: 15 rpm is increased, and the rightmost “printing speed: 5th” displayed as “fast” corresponds to the highest printing speed of 120 sheets / min: 120 rpm, respectively. Is set.
The printing speed display device 113A lights up and displays the set printing speed by switching the printing speed in five stages from 1 to 5 by pressing the speed down key 113a or the speed up key 113b each time.

The four-direction key 114 has an up key 114a, a down key 114b, a left key 114c, and a right key 114d, and selects a numerical value, an item, or the like when adjusting the surface image position when editing the surface image or when making various settings. Pressed in some cases. Here, the left key 114c and the right key 114d are front surface printed images (hereinafter referred to as “front surface images”) that are transferred onto the surface of the paper P in correspondence with the first plate making image 65A in the divided plate making master 65 shown in FIG. A surface image position operating means for instructing the amount of movement of the position along the paper conveyance direction, that is, for instructing the amount of vertical movement of the surface image, and a function as a surface image position adjustment key.
The four-way key 214 includes an up key 214a, a down key 214b, a left key 214c, and a right key 214d, and selects a numerical value, an item, or the like when adjusting the position of the back image when editing the back image or when performing various settings. Pressed in some cases. Here, the left key 214c and the right key 214d are the back side printed images (hereinafter referred to as “the back side printed paper PA”) corresponding to the second plate making image 65B in the divided master plate master 65 shown in FIG. A function as a back image position operation means and a back image position adjustment key for instructing the amount of movement of the position of the back image along the paper conveyance direction, that is, for instructing the top and bottom movement amount of the back image. Have.
More specifically, for example, each time the left key 114c is pressed once, the surface image can be moved by 0.25 mm downstream in the paper conveyance direction, that is, in the top direction of the paper P, on the contrary, Each time the right key 114d is pressed, the surface image can be moved by 0.25 mm in the upstream direction in the sheet conveyance direction, that is, in the ground direction of the sheet P.
Similarly to the above, the four-direction keys 214c and 214d also move the back side image by 0.25 mm to the downstream side in the paper transport direction, that is, the top direction of the paper P, each time the left key 214c is pressed once, for example. On the contrary, each time the right key 214d is pressed, the back side image can be moved by 0.25 mm toward the upstream side of the paper conveyance direction, that is, the ground direction of the paper P. .

  The paper size setting key 115 is pressed when an arbitrary paper size is input, and the paper size input with the paper size setting key 115 has priority over the paper size information detected by the paper size detection sensor 73. The duplex printing key 117 is pressed before the stencil start key 104 is pressed when the stencil duplex printing apparatus 1 performs the duplex printing operation, and when the duplex printing key 117 is pressed, the LED 117a arranged in the vicinity thereof lights up. The operator is informed that it is in the duplex printing mode. Similarly to the double-sided printing key 117, the single-sided printing key 118 is pressed before the start key 104 is pressed when the stencil duplex printing apparatus 1 performs a single-sided printing operation, and when the single-sided printing key 118 is pressed, it is arranged in the vicinity thereof. The LED 118a thus turned on is displayed to the operator that the single-sided printing mode is set. In the stencil duplex printing apparatus 1, the LED 118a is lit in the initial state, and the single-sided printing mode is automatically initialized.

  A display device 119 composed of a 7-segment LED mainly displays numbers such as the number of printed sheets. The display device 120 composed of an LCD has a hierarchical display structure. By pressing selection setting keys 120a, 120b, 120c, and 120d provided below the display device 120, setting of various printing conditions, scaling, and image position adjustment are performed. It is possible to change to various modes such as the above and set in each mode. Further, the display device 120 displays the state of the stencil duplex printing device 1 such as “can be made / printed” as shown in the figure, an alarm such as plate making or discharge jam, paper feed or paper discharge jam, paper In addition, a supply instruction of a supply such as a master and ink is also displayed.

The selection setting key 120a has a function as a master type setting means for setting a master type (master type). As shown in FIG. 13, there are three types of master types, namely, A (standard) master and B (endurance). ) Any one of a master and a C (cost reduction) master can be set. This is a well-known configuration in which the master type displayed on the display device 120 can be reversed and selected by pressing the selection setting key 120a once. The selection setting keys 120b, 120c, and 120d described later can also be selected. It is the same.
The master A (standard) shown in the display device 120 of FIG. 9 is the predetermined master 64 used in the present embodiment. For example, the thickness of a polyester-based thermoplastic resin film is 1.0 to 2. The thickness is 5 μm, the thickness of the porous support is 10 to 20 μm, and the remaining thickness is a three-layer structure having a total of 50 μm composed of a Japanese paper fiber layer. This master has been proposed in Japanese Patent Application Laid-Open No. 10-147075 and the like, and has, for example, a porous resin film made of a resin on one surface of a polyethylene terephthalate (PET) -based thermoplastic resin film. It is a master formed by laminating a porous fiber film made of a fibrous material on the surface.
The master of A (standard) has an elongation characteristic (elongation rate) of the master alone corresponding to the number of printed sheets between the master of B (endurance) and the master of C (cost reduction).

  The selection setting key 120b has a function as an ink color setting means for setting the ink color, and as shown in FIG. 13, there are six types of ink colors, namely black ink, red ink, blue ink, green ink, and strawberry ink. One of purple ink and purple ink can be set. The black ink shown in the display device 120 of FIG. 9 is a predetermined ink color used in this embodiment. The ink has different fluidity depending on the composition of the pigment and the like, which are the components of the ink, and the amount thereof, in other words, the adhesive force due to the viscosity of the ink varies depending on the type of ink color.

  The selection setting key 120c has a function as a paper type setting means for setting a paper type which is a type of print medium, and as shown in FIG. 13, there are three types of paper types, that is, thin paper including renewal paper and printed paper. Any one of standard paper including stencil fine paper and plain paper, and drawing paper, postcards, and cardboard including envelopes can be set. The standard paper shown in the display device 120 of FIG. 9 is a predetermined paper used in this embodiment. Since the thickness of the paper mainly varies depending on the type, the magnitude of the pressure contact force in the pulling direction with respect to the master 64 on the plate cylinder 12, that is, the master position deviation on the plate cylinder 12 is affected.

The selection setting key 120d has a function as plate cylinder type setting means for setting the type of plate cylinder (hereinafter also referred to as “drum type”). As shown in FIG. 13, there are two types of drum types, that is, A3. Any one of a drum and a DLT drum (double letter drum) can be set. The A3 drum shown in the display device 120 of FIG. 9 is a predetermined plate cylinder used in this embodiment. The plate cylinder mainly has a length and area around which the master is wound, depending on the type of the plate cylinder, which affects the misalignment of the master on the plate cylinder 12.
In the present embodiment, since the printing conditions are limited to predetermined printing conditions as will be described later, the selection setting keys 120a to 120d are not essential and may be omitted. Further, instead of the selection setting keys 120a to 120d, dedicated keys and LEDs may be provided, respectively, and the setting conditions of the printing conditions may be confirmed by turning on the LEDs.

With reference to FIG. 1, FIG. 6, FIG. 8, and FIG. 10, the periphery of the surface top and bottom moving means 250 will be described. The surface top and bottom moving means 250 shown in FIG. 8 is a surface printing image transferred from the first plate making image 65A (surface plate making image) in the divided plate making master 65 on the plate cylinder 12 shown in FIG. This is for moving the position in the paper transport direction (top and bottom direction) of the paper P.
A fan-shaped gear 249 that rotationally drives the driving roller 71 a of the registration roller pair 71 is disposed inside the apparatus main body 11. The sector gear 249 is supported on the apparatus main body 11 so as to be swingable at a substantially central portion thereof by a support shaft 249a, and has a gear portion 249b and a cam follower 249c. The gear portion 249b meshes with a registration gear 71c provided integrally with the drive roller 71a on the same axis.
On the left side of the sector gear 249, surface top and bottom moving means 250 for transmitting the rotational driving force from the plate cylinder driving unit 121 (main motor) to the sector gear 249 is disposed. The surface top and bottom moving means 250 has the same configuration as the top and bottom moving means (50) disclosed in FIG. 3 of JP-A-2006-192835. That is, the surface top and bottom moving means 250 includes a drive gear 251, a driven gear 252, a first link 253, a first gear 254, a second link 255, a second gear 256, a third link 257, a registration cam 258, and a phase displacement (not shown). Means.

  The driving gear 251 to which the rotational driving force from the plate cylinder driving unit 121 is transmitted is attached to a support shaft 251 a that is rotatably supported by the apparatus main body 11. A driven gear 252 having the same shape as the drive gear 251 is attached to a support shaft 252a rotatably supported by the apparatus main body 11, and a registration cam 258 for swinging the sector gear 249 is integrally formed on the support shaft 252a. Is attached. The registration cam 258 has a recess 258a in a part of its peripheral surface, and a cam follower 249c that can roll on the peripheral surface is provided on the peripheral surface of the registration cam 258 (for example, an urging force of an urging means (not shown)). The fan-shaped gear 249 is always in pressure contact with a tension spring or the like stretched on the right side of the sector gear 249 near the resist gear 71c. With this configuration, when the registration cam 258 rotates and the cam follower 249c is fitted and engaged with the recess 258a, the sector gear 249 swings counterclockwise in FIG. 2, thereby driving the registration gear 71c to rotate and driving roller 71a. Is driven to rotate. A one-way clutch (not shown) is interposed between the shafts of the registration gear 71c and the drive roller 71a so as not to transmit the rotational force to the drive roller 71a when the sector gear 249 swings in the clockwise direction. ing.

One end of the first link 253 is rotatably supported by the support shaft 251a, and the first gear 254 meshes the peripheral surface of the drive gear 251 with the other end of the first link 253. It is supported in a freely rotatable manner. Thus, the first gear 254 is supported on the circumferential surface of the drive gear 251 by the first link 253 so as to be able to roll.
One end of the second link 255 is rotatably supported by the support shaft 252a, and the second gear 256 meshes with the peripheral surface of the driven gear 252 at the other end of the second link 255. It is supported in a freely rotatable manner. Thus, the second gear 256 is supported on the peripheral surface of the driven gear 252 by the second link 255 so that it can roll. Further, the first gear 254 and the second gear 256 are rotatably supported by the third link 257 in a state where the respective peripheral surfaces are engaged with each other.

  The first link 253 is attached with phase displacement means made up of an arm member (not shown) that can be expanded and contracted by an actuator (not shown) such as a motor or a cylinder. As a specific example of this phase displacement means, as schematically shown in FIG. 8, the up-and-down moving motor 259 fixed on the apparatus body 11 side and fixed to the output shaft of the up-and-down moving motor 259 are fixed. A male screw (not shown), an arm member (not shown) formed on the first link 253 and formed with a female screw to be engaged with the male screw, and a home position sensor (not shown) for detecting the home position of the arm member Etc. When the plate cylinder driving means 121 is stopped and the drive gear 251 is stopped, the position of the first link 253 is displaced by rotating the top / bottom movement motor 259 of the phase displacement means (not shown) in the normal direction or the reverse direction. The first gear 254 rolls on the peripheral surface of the drive gear 251, the driven gear 252 is rotated via the second gear 256 with the rotation of the first gear 254, and the registration cam 258 is rotated with the rotation of the driven gear 252. , The position of the recess 258a is displaced, and the operation timing of the registration roller pair 71 (drive roller 71a) with respect to the phase (rotation angle) of the plate cylinder 12 is changed.

  In this embodiment, the registration roller pair 71 with respect to the phase of the plate cylinder 12 is obtained by displacing the first link 253 by the top and bottom moving motor 259 of the phase displacement means (not shown) and rolling the first gear 254 on the drive gear 251. However, the second link 255 is displaced by the top and bottom movement motor 259 of the phase displacement means (not shown), and the second gear 256 is rolled on the driven gear 252 so that the plate cylinder 12 is moved. A configuration in which the operation timing of the registration roller pair 71 with respect to the phase may be changed may be employed. The surface top and bottom moving means 250 is not limited to this, and may be the top and bottom moving means (65) disclosed in FIG. 5 of Japanese Patent Application Laid-Open No. 2006-192835.

Further, as the surface top-and-bottom moving means, a method of rotating the registration roller pair 71 by a registration motor composed of, for example, a stepping motor independent of the plate cylinder driving means 121 and changing the rotation drive start (starting) timing of the registration motor. If it is used, surface top and bottom movement can be executed without stopping the plate cylinder 12 during continuous printing. As a configuration example in which the driving roller 71a of the registration roller pair 71 is rotationally driven by a registration motor composed of a stepping motor, it is desirable to employ, for example, the one disclosed in FIG. 1 of Japanese Patent Application Laid-Open No. 11-48595.
The surface top-and-bottom moving means in the present invention is the rotation start / operation timing (feeding) of the registration roller pair 71 as the feeding means for feeding the paper P to the printing unit 2 in synchronization with the rotation of the plate cylinder 12 as described above. The “registration roller method” is used to change the timing.

With reference to FIG. 1, FIG. 2, FIG. 5, FIG. 6, and FIG. The back surface up / down moving means determines the position of the back side printed image transferred from the second plate making image 65B (back side plate making image) in the divided plate making master 65 on the plate cylinder 12 shown in FIG. This is for moving the paper P in the paper conveyance direction (upside down). The backside up / down moving means mainly comprises a refeeding registration roller contact / separation mechanism 160 provided with a solenoid 33 as a backside up / down movement driving means.
In the above-described backside upside-down movement, the front-side printed paper PA conveyed to the re-feed conveyance unit 25 is abutted against the re-feed positioning member 24 and temporarily stopped, and the re-feed registration roller 23 is raised and re-feeded. The re-feeding registration roller contact / separation mechanism 160 that also serves as the backside upside driving means shown in FIG. 5 and the like is provided so that the front surface-printed paper PA temporarily stopped on the paper positioning member 24 comes into pressure contact with the outer peripheral surface of the press roller 13. This is done by adjusting the operation timing for turning on the solenoid 33.

With reference to FIG. 10, the control configuration of the main part of the stencil duplex printing apparatus 1 will be described. In the figure, the control means 129 is provided in the apparatus main body 11 and comprises a microcomputer having a CPU 130, a ROM 131, a RAM 132, a timer 133, and the like.
The CPU 130 is based on various signals from the operation panel 103 (on / off signals and data signals related to activation and setting), detection signals from the various sensors provided in the apparatus main body 11, and operation programs called from the ROM 131. , Printing unit 2, plate making unit 3, paper feeding unit 4, plate discharging unit 5, paper discharge unit 6, driving means provided in image reading unit 7, solenoid 33 provided in refeeding means 9 and transport unit driving The motor 122, the solenoid 123 for operating the switching member 10, the top and bottom moving motor 259 provided on the top and bottom moving means 250, the operation of the display devices 119 and 120 of the operation panel 103, and the like are controlled, and the entire stencil duplex printing apparatus 1 is controlled. Control the behavior.

The ROM 131 stores an operation program for the entire stencil duplex printing apparatus 1, and this operation program is appropriately called by the CPU 130. As an operation program peculiar to the present embodiment, an operation program for driving the top / bottom movement motor 259 of the top / bottom movement means 250, a solenoid 33 (hereinafter, referred to as a re-feeding registration roller contact / separation mechanism 160 as a back / top movement means) Operation program for driving “solenoid 33 of back surface top and bottom moving means” and data relating to the front and back surface top and bottom surface movement correction values set in advance for each predetermined number of printed sheets as shown in FIG. Examples include a table.
The operation of the top / bottom movement motor 259 is performed based on the set amount in the paper transport direction (top / bottom direction) set on the operation panel 103, and is automatically executed during printing. The operation of the solenoid 33 of the back and top moving means is also performed automatically during printing, in addition to being performed based on the set amount in the paper transport direction (top and bottom direction) set on the operation panel 103. As described above, the ROM 131 has a function as a storage unit that stores a front and back top movement correction value and a back top and bottom movement correction value set in advance for each predetermined number of printed sheets.
The operation program called from the ROM 131 by the CPU 130 is temporarily written in the RAM 132, and the operation program is rewritten by an input from the operation panel 103. The RAM 132 stores the total number of prints obtained by adding the number of prints transmitted from the paper discharge sensor 150 by the CPU 130. The RAM 132 also has a function of temporarily storing calculation results of the CPU 130, a function of storing data signals and on / off signals set and input from various keys and various sensors on the operation panel 103 as needed.
The CPU 130 of the control unit 129 (hereinafter, also simply referred to as “control unit 129”) performs a phase timing signal (home position signal) from the home position sensor 135 and plate cylinder rotation generated every time the plate cylinder 12 rotates by a certain angle. Based on the rotation pulse signal from the angle sensor 152, the rotational speed (printing speed) of the plate cylinder 12 is recognized and grasped as needed, and the rotational position (rotation phase position) of the plate cylinder 12 is recognized and grasped in real time. Yes.

Here, with respect to the data tables of the predetermined number of printed sheets and the top and bottom vertical movement correction value and the predetermined number of printed sheets and the reverse side vertical movement correction value shown in FIG. A description will be added with reference to b). In the present invention, not only the initial elongation of the above-described divided plate-making master 65 alone, but the same divided plate-made master 65 on the plate cylinder 12 grows little by little as the number of printed sheets increases, and the elongation is accumulated. It has been confirmed that it has an effect on master elongation. In the present embodiment and the like, a description will be given mainly of the master position shift and its correction by clamping the divided plate-making master 65 in the plate cylinder 12.
As described in the above problem section, as shown in FIG. 26 (a), the tip end portion is clamped and held by a clamper 19b provided on the plate cylinder 12 as in the stencil duplex printing apparatus 1 of the present embodiment. The divided master making master 65 has a slight initial deflection 65X at the time of master winding, and pulls the split master making master 65 in the rotation direction of the plate cylinder 12 when printing pressure is applied by the press roller 13 during printing. As a result, the master misalignment inevitably occurs until the initial deflection 65X and the initial elongation of the divided master-making master 65 alone are absorbed, and as a result, the duplex printing misalignment occurs.
Since the position where the initial deflection 65X of the divided master-making master 65 occurs is a non-opening portion around the clamper 19b arrangement portion in the plate cylinder 12, the divided master-making master 65 of the initial deflection 65X is made of the plate cylinder 12 by ink. It is not in a state of sticking to the outer peripheral surface.
As shown in FIG. 26B, the state when the initial elongation of the divided master-making master 65 alone is absorbed in addition to the initial deflection 65X is upstream from the initial deflection 65X in the rotational direction of the plate cylinder 12. Due to the adhesive force of the ink that has been exuded from the opening of the plate cylinder 12, the divided master plate master 65 on the side is stuck to the outer peripheral surface of the plate cylinder 12 except for the rear end portion 65 </ b> Z of the master plate 65.

Master misalignment that occurs before the initial wrinkle 65X and the initial elongation of the divided master-making master 65 alone are absorbed by a plurality of experiments under the same printing conditions. There is a close correlation between them. Further, the master position deviation has been found to be correlated with the number of printed sheets by a plurality of experiments even when, for example, the master type or the paper type used as the printing condition changes. .
Therefore, in the present embodiment, from the relationship between the number of printed sheets obtained by experiments and the master position deviation, as shown in FIGS. 11A and 11B, a predetermined number of printed sheets (first sheet, 101) shown on the horizontal axis. 1st sheet, 501st sheet, 1001st sheet, 2001th sheet, etc.) and the top and bottom top and bottom top movement correction values (mm) shown on the vertical axis are set as data tables representing the relationship between the ROM 131 and the ROM 131. Is previously stored in the program. The maximum amount of the front and back top movement correction value and the back side top and bottom movement correction value (mm) is, for example, about 5 mm in the stencil duplex printing apparatus 1 having the above-described configuration.

The master misalignment correction parameters such as printing conditions that affect the master misalignment are regarded as the number of printed sheets (main parameter) in the present embodiment, but there are various sub parameters as in the modification examples described later. Needless to say. Therefore, the data table used in the present embodiment is for a table in which the master type, drum type, ink color, printing speed, paper type, and ink temperature are set as predetermined types or predetermined values as sub-parameters. is there. From a different viewpoint, the present embodiment can be regarded as an embodiment that focuses only on the number of printed sheets, which is the main parameter when the above sub-parameters are not considered.
A data table representing the relationship between the number of printed sheets and the top-and-bottom movement correction value shown in FIG. 11A, and a data table representing the relationship between the number of printed sheets and the back-and-bottom movement correction value shown in FIG. The configuration of the printing unit 2 as in the first embodiment tends to be as shown in the figure, but is merely an example, and the configuration content of the printing unit mainly of the duplex printing device including the stencil duplex printing device Depending on the situation, there may be a unique tendency, and it should be noted that the present invention can also be applied to such a duplex printing apparatus.

  Based on the above-described configuration, the operation of the stencil duplex printing apparatus 1 will be described. First, an operation example in which single-sided printing mode is set and single-sided printing is performed will be briefly described. The single-sided printing operation by the stencil duplex printing device 1 is almost the same as the single-sided printing operation by the conventional stencil printing device, and the single-sided printing key 118 is pressed by the operator as compared with the single-sided printing operation by the conventional stencil printing device. Then, it becomes possible to confirm that the single-sided printing mode has been set by turning on the LED 118a, the point where the switching member 10 is positioned at the first position, and the single-sided printing cam plate 43A is selected and used. The only difference is that the re-feeding means 9 is performed in a non-operating state, and it is easy for those skilled in the art from the double-sided operation examples described later and the contents disclosed in the above-mentioned Patent Documents 2, 3 and the like. The description is omitted because it can be understood and implemented.

Next, a case where duplex printing is performed by pressing the duplex printing key 117 will be described. The configuration and operation of the paper receiving plate 40 shown in FIG. 1 are as disclosed in detail in paragraphs “0134” to “0155” of Japanese Patent Application Laid-Open No. 2004-26373. Since this is not closely related to the present invention, description of this part is omitted.
The operator loads the paper P to be used for printing on the paper feed tray 67, opens the pressure plate 94 and places a document to be printed on the contact glass 93, and then closes the pressure plate 94 again. Thereafter, the operator sets the plate making conditions using various keys on the operation panel 103 and then presses the duplex printing key 117. After confirming that the duplex printing mode is in effect by turning on the LED 117a, when the plate making start key 104 is pressed, a paper size detection signal is output from the paper size detection sensor 73, and an original size detection signal is output from the original size detection sensor 102. The control means 129 sent to the control means 129 and receiving the signal compares each signal. At this time, if the paper size and the document size are the same, the image reading operation is immediately performed. If the paper size and the document size are different, the control unit 129 displays the fact on the display device 120 and pays attention to the operator. Prompt.

  In the first embodiment, since the maximum paper size that can be printed by the plate cylinder 12 is A3 size, the paper size that can be used during duplex printing is up to A4 landscape. As a result of comparing the document size and the paper size, if both sizes are the same, the image reading operation is immediately performed. If the two sizes are different, the control unit 129 displays a message to that effect on the display device 120 as a warning. Call attention to the operator. When the paper size and the document size are different, a configuration in which enlargement or reduction is automatically performed according to a command from the control unit 129 to match the document size and the image size, and the display device 120 is configured to reduce or reduce the size of the image data. It is good also as a structure which displays the procedure, such as rotation, and assists an operator's operation. When the paper size exceeds A4 landscape, the control unit 129 may display on the display device 120 a message that prohibits double-sided printing and prompts single-sided printing.

When the plate making start key 104 is pressed, the image reading unit 7 performs a reading operation of the first original image. Reading of the document image is performed by reflecting the reflected light exposed by the fluorescent lamp 99 by each of the reflection mirrors 95, 96, 97, and 98. The read document image is focused by the lens 100 and then image sensor 101. And is photoelectrically converted. The photoelectrically converted electric signal is input to an A / D converter (not shown) in the apparatus main body 11 and then stored in the image memory 136 as the first image data signal. When the reading operation of the first original is completed and the image data signal is stored in the image memory 136, the control means 129 displays that the second original should be set on the display device 120. Make it. The operator opens the pressure plate 94 in accordance with this display, removes the first original from the contact glass 93, places the second original, and closes the pressure plate 94 again. When a sensor (not shown) detects that the pressure plate 94 is closed and another sensor (not shown) detects that there is a document on the contact glass 93, the reading operation of the second document is performed in the same manner as the first sheet. Is called. The read document image is stored in the image memory 136 as a second image data signal.
In this embodiment, the document reading operation in the single-sided printing mode and the double-sided printing mode is configured such that the operator sets the document to be read on the contact glass 93 by opening and closing the pressure plate 94, but using the ADF. A configuration in which a document is automatically conveyed onto the contact glass 93 or a configuration in which image data is taken in from an external device (not shown) such as a computer without performing a document reading operation may be employed. Further, in the duplex printing mode, one original may be reversed and conveyed, and image data for two sheets may be acquired from the front and back surfaces.

  In parallel with the image reading operation in the image reading unit 7, the plate discharging unit 5 performs a plate discharging operation for peeling and discharging the used master 64 c from the outer peripheral surface of the plate cylinder 12. When the plate making start key 104 is pressed, the plate cylinder driving means 121 is activated to start the rotation of the plate cylinder 12, and when the plate cylinder 12 reaches the home position shown in FIG. It is detected by engaging (shading) the position sensor 135, and a phase timing (home position) signal is sent from the home position sensor 135 to the control means 129. Receiving the phase timing signal, the control means 129 measures the number of pulses generated by the plate cylinder rotation angle sensor 152 with this home position as a base point, and the tip of the used master 64c wound on the outer peripheral surface of the plate cylinder 12 is detected. When it is determined that the predetermined plate discharging position corresponding to the endless belt 83 located on the outer peripheral surface of the driven roller 82 has been reached, the operation of the plate cylinder driving means 121 is stopped.

When the plate cylinder driving unit 121 is stopped and the plate cylinder 12 is stopped at a predetermined plate discharging position, the plate cylinder driving unit 121 and the plate discharging driving unit 126 are operated to rotate the drive rollers 78 and 81 and to lower the plate discharging member. 75 moves to the plate cylinder 12 side, and the endless belt 83 located on the outer peripheral surface of the driven roller 82 contacts the used master 64c on the plate cylinder 12. Then, the used master 64c scooped up from the outer peripheral surface of the plate cylinder 12 by the rotation of the plate cylinder 12 and the movement of the endless belt 83 is nipped and conveyed by the lower plate discharge member 75 and the upper plate discharge member 74, and It peels from the outer peripheral surface. The peeled used master 64c is discarded in the plate removal box 76 and then compressed by the compression plate 77.
Even after all the used master 64c is peeled off from the outer peripheral surface, the plate cylinder 12 continues to rotate, and the clamper 19b rotates to a predetermined plate supply standby position located at the upper right and stops. When the plate cylinder 12 stops at the plate feeding standby position, an opening / closing means (not shown) is operated to open the clamper 19b, and the stencil duplex printing apparatus 1 enters a plate feeding standby state.

In parallel with the plate removal operation, the plate making unit 3 performs the plate making operation. When the plate making start key 104 is pressed, the platen roller 58, the tension roller pair 62, and the reverse roller pair 63 are driven to rotate, and the master 64 is pulled out from the master roll 64a. At this time, a movable master guide plate (not shown) is positioned at the transport position. When the master 64 is pulled out and the image forming area reaches a position corresponding to the heating element of the thermal head 59, the image data signal stored in the image memory 136 is called after image processing is performed, not shown. As a result of the thermal head driver selectively heating each heating element of the thermal head 59, the master 64 has a first plate-making image 65A and a second plate-making image 65B on its thermoplastic resin film surface as shown in FIG. It is formed. At this time, each of the images 65A and 65B is formed and made so that a predetermined blank portion S is provided between the first plate-making image 65A and the second plate-making image 65B as shown in FIG. The predetermined blank portion S is provided at a position corresponding to the intermediate region shown in FIG. 1 when the divided plate-making master 65 is wound on the outer peripheral surface of the plate cylinder 12.
When the master 64 is conveyed while being made and its tip is sandwiched between the reverse roller pair 63, a movable master guide plate (not shown) is moved to the retracted position and the rotation of the reverse roller pair 63 is stopped. Even after the rotation of the reverse roller pair 63 is stopped, the platen roller 58 and the tension roller pair 62 continue to rotate, and the divided master plate master 65 made by the thermal head 59 is stored in the master stock unit 61. When the pair of reversing rollers 63 is stopped, a suction fan (not shown) provided in the master stock unit 61 is operated, and the divided master 65 is sucked by a suction fan (not shown) so that the master stock unit 61 can be well To be stored.

During the plate making operation described above, when the plate discharge operation is completed and the stencil duplex printing apparatus 1 enters a plate feed standby state, the reverse roller pair 63 starts rotating and the divided plate-making master 65 stored in the master stock unit 61 is stored. Is conveyed between the clamper 19b and the stage portion 19a. Then, when the leading end of the divided plate-making master 65 is transported to a predetermined position where it can be clamped by the clamper 19b, an opening / closing means (not shown) is actuated to close the clamper 19b. The portion 19a and the clamper 19b are held on the outer peripheral surface of the plate cylinder 12.
Thereafter, the plate cylinder 12 is intermittently rotated clockwise in FIG. 1, and the winding operation of the divided plate-making master 65 around the plate cylinder 12 is performed. At this time, the reversing roller pair 63 has stopped rotating, and the driving roller 63a is rotated along with the drawing-out master 65 by the one-way clutch (not shown) provided therein. Then, when all the image data for two sheets are sent from the image memory 136 and the image data signal is interrupted, the operation of the thermal head 59 is stopped, and when the divided plate-making master 65 for one plate is conveyed, the platen roller 58, The rotation of the tension roller pair 62 and the reverse roller pair 63 is stopped, and the cutting means 60 is operated to cut the divided plate-making master 65. The cut divided plate-making master 65 is pulled out from the plate-making unit 3 by the rotation of the plate cylinder 12, and after the one-plate divided plate-making master 65 is completely wound on the outer peripheral surface of the plate cylinder 12, When the cylinder 12 rotates to the home position and stops, the plate making operation and the plate feeding operation are completed.

The printing operation is performed following the plate feeding operation. After the solenoid 123 is actuated and the switching member 10 is positioned at the first position, a press roller locking means (not shown) is actuated, and the stepping motor 52 is actuated to rotate the step cam 49 and the cam portion 49a is moved to the cam follower. 48c. As a result, the movable arm 48 is swung around the support shaft 48a and the cam shaft 44 is moved to a position where the cam plate 43B can be brought into contact with the cam follower 41. Is released.
Thereafter, the paper feed roller 68, the separation roller 69, the drive rollers 36 and 87, and the suction fans 39 and 90 are respectively driven, and the plate cylinder 12 is rotationally driven at a low speed in the clockwise direction in FIG. The uppermost first sheet P stacked on the tray 67 is sent out in the sheet conveying direction by the sheet feeding roller 68 and further separated into one sheet by the cooperative action of the separation roller 69 and the separation pad 70. The paper P is fed toward the registration roller pair 71, and the leading end of the paper P is abutted against the nip portion of the registration roller pair 71 and temporarily stopped (the paper in this state is the paper P indicated by a thick solid line in FIG. 1). is there). When the clamper 19b passes the position corresponding to the switching member 10, the solenoid 123 is actuated to position the switching member 10 at the second position, and then the plate of the divided plate-making master 65 wound around the plate cylinder 12 is reached. The cam follower 249c shown in FIG. 8 is fitted into and engaged with the recess 258a at a predetermined timing when the image area leading end of the first plate-making image 65A reaches the contact portion with the press roller 13 in the cylinder rotation direction, and the sector gear 249 is engaged. 8 is pivoted counterclockwise in FIG. 8 around the support shaft 249a, and the registration gear 71c is rotationally driven, whereby the driving roller 71a (registration roller pair 71) is rotationally driven, and the sheet P is transferred to the plate cylinder 12 and the press roller. It is fed toward 13.

  In synchronization with the rotation of the plate cylinder 12, the press roller contact / separation mechanism 55 rotates the cam shaft 44 and the multistage cam 43 provided integrally therewith. As described above, at the predetermined timing, the cam follower 41 is driven. The cam plate 43B that has been moved to a position where it can come into contact with the cam follower 41 is detached from the cam follower 41. As a result, the press roller 13 presses the peripheral surface thereof against the outer peripheral surface of the plate cylinder 12 by the urging force of the printing spring 42, and the sheet P fed by the registration roller pair 71 is divided into the master plates on the plate cylinder 12. 65 is pressed. By this pressing operation, the press roller 13, the first sheet P, the first plate-making image 65A forming portion of the divided plate-making master 65, and the plate cylinder 12 are pressed against each other, and the ink roller 16 contacts the inner peripheral surface of the plate cylinder 12. The supplied ink oozes out from the opening of the plate cylinder 12 and is filled into a porous support plate (not shown) and a mesh screen (not shown) wound around the plate cylinder 12 and a porous support body of the divided plate-making master 65. Later, the first plate making image 65A is transferred and transferred to the first sheet P through the perforated portion, and the portion of the divided plate making master 65 where the first plate making image 65A is formed is printed.

  The first sheet P, which has been printed on its surface with a surface-printed image corresponding to the first plate-making image 65A as a surface-printed sheet PA, is printed on the outer peripheral surface of the plate cylinder from one end thereof by the tip of the switching member 10. While being separated from the divided master-making master 65, the sheet is guided to the paper re-feeding means 9 by the switching member 10 occupying the second position. The surface-printed paper PA guided downward by the switching member 10 passes between the guide plates 27 and 56, has one end abutting against the end fence 8 a, and is placed on the auxiliary tray 8. The surface-printed paper PA conveyed on the auxiliary tray 8 is conveyed in the direction of the arrow in FIG. 1 while being held by the endless belt 38 by the suction force of the suction fan 39, and the other end (when the first plate-making image 65A is printed). The rear end is brought into contact with the refeed positioning member 24. At this time, the sensor 8c detects the other end of the surface-printed paper PA, and a detection signal from the sensor 8c is output to the control unit 129, so that a command is sent from the control unit 129 and the drive roller 36 and the suction unit are sucked. The operation of the fan 39 is stopped. The front-side printed paper PA in FIG. 1 shows a state in which the leading end is in contact with the re-feed positioning member 24.

The plate cylinder 12 continues to rotate while the first sheet P is being guided on the auxiliary tray 8, and the press roller 13 protrudes from the cam plate 43B when it finishes contacting the surface area of the plate cylinder 12. The portion is in contact with the cam follower 41 and occupies the separated position. Due to the function of the cam plate 43B, the back surface region of the plate cylinder 12 and the press roller 13 do not come into pressure contact with each other in the absence of the paper P, and ink transfer to the outer peripheral surface of the press roller 13 can be prevented. At this time, a press roller locking means (not shown) is operated to hold the press roller 13 in the separated position, and then the stepping motor 52 is operated to rotate the step cam 49 to bring the cam portion 49b into contact with the cam follower 48c. As a result, the moving arm 48 is swung around the support shaft 48a, and the cam shaft 44 is moved to a position where the cam plate 43A can be brought into contact with the cam follower 41.
The paper feed roller 68 and the separation roller 69 are driven almost simultaneously with the above-described operation, the second sheet P is drawn from the paper feed tray 67, and the leading end of the paper P is abutted against the registration roller pair 71 and temporarily stopped. . Then, the driving roller 71a is rotationally driven at the same predetermined timing as described above, and the drawn second sheet P is fed between the plate cylinder 12 and the press roller 13.

On the other hand, in the press roller contact / separation mechanism 55, when the cam shaft 44 rotates to a position where the convex portion of the moved cam plate 43A can come into contact with the cam follower 41, the operation of the press roller locking means (not shown) is released. At this time, the plate cylinder 12 rotating in synchronization with the camshaft 44 occupies a position where the non-opening portion, which is a portion other than the front surface region, the back surface region, and the intermediate region, faces the press roller 13. Further, the solenoid 123 is operated until the surface region of the plate cylinder 12 passes through the portion facing the press roller 13 and the clamper 19b again occupies the position corresponding to the switching member 10, and the switching member 10 is moved to the second state. It is displaced from the position to the first position.
At a predetermined timing when the second sheet P is fed by the registration roller pair 71, the cam plate 43 </ b> A disengages the convex portion from the cam follower 41, so that the press roller 13 is moved to the outer periphery by the biasing force of the printing spring 42. The surface is brought into pressure contact with the outer peripheral surface of the plate cylinder 12. As a result, the press roller 13, the second sheet P, the first plate-making image 65A forming portion of the divided plate-making master 65, and the plate cylinder 12 are pressed against each other and supplied to the inner peripheral surface of the plate cylinder 12 by the ink roller 16. Ink is transferred onto the second sheet P through the opening of the plate cylinder 12, a porous support plate (not shown), a mesh screen (not shown), and a perforated portion of the first platemaking image 65A.

The second sheet P, which has been printed with an image corresponding to the first plate-making image 65A and has become a printed sheet PB, is guided to the sheet discharge conveyance unit 85 by the switching member 10 occupying the first position, and The peeling claw 84 peels from one end of the divided plate-making master 65 on the outer peripheral surface of the plate cylinder. The peeled printed paper PB is dropped downward and sent to the paper discharge transport unit 85 and then discharged onto the paper discharge tray 86.
Further, after the second sheet P is fed by the registration roller pair 71, the leading edge of the image area of the second plate-making image 65B in the plate cylinder rotation direction of the divided plate-making master 65 is at a position corresponding to the press roller 13. The solenoid 33 is actuated at a predetermined timing which is slightly earlier than the arrival, and the swing arm 32 is swung in the clockwise direction in FIG. 5 about the support shaft 32a. As a result, the re-feed registration roller 23 is swung from the separation position to the press-contact position, so that the surface-printed paper PA that has been stopped with the other end in contact with the re-feed positioning member 24 is removed. 12 is brought into contact with the outer peripheral surface of the press roller 13 that is in pressure contact with the rotary roller 12 and is driven to rotate.
At this time, since the press roller 13 is driven and rotated at the same peripheral speed as the peripheral speed of the plate cylinder 12, the surface-printed paper PA abutted on the outer peripheral surface of the press roller 13 by the refeed resist roller 23 is Then, it is conveyed downstream in the rotational direction by the rotational force of the press roller 13. At this time, the surface-printed paper PA is conveyed toward the printing nip portion with the plate cylinder 12 while being in close contact with the outer peripheral surface of the press roller 13 by the paper guide plate 31 and the rollers 28, 29, and 30. At this time, an image corresponding to the first plate-making image 65A is printed on the surface of the surface-printed paper PA, but the surface-printed paper PA is applied to the outer peripheral surface of the press roller 13 by the operation of the refeed guide member 22. Since they are in close contact with each other, the surface-printed paper PA once in contact with the outer peripheral surface of the press roller 13 is not displaced, and the occurrence of problems such as rubbing dirt or thickening of image lines is prevented. Then, after the rear end and the intermediate area of the second sheet P pass through the position corresponding to the press roller 13, the front surface printed sheet is reached at the timing when the front end of the back area reaches the position corresponding to the press roller 13. PA is reversed and fed to the printing nip portion between the plate cylinder 12 and the press roller 13.

As a result, the press roller 13, the surface-printed paper PA, the second plate-making image 65B forming portion of the divided plate-making master 65, and the plate cylinder 12 are pressed against each other and supplied to the inner peripheral surface of the plate cylinder 12 by the ink roller 16. Ink is transferred and transferred to the back surface of the surface-printed paper PA through the opening of the plate cylinder 12, a porous support plate (not shown) and a mesh screen (not shown), and a perforated portion of the second plate-making image 65B. Of these, the portion where the second plate-making image 65B is formed is printed.
An image corresponding to the first plate-making image 65A is printed on the front surface (lower surface), and an image corresponding to the second plate-making image 65B is printed on the back surface (upper surface). P is guided to the paper discharge transport unit 85 by the switching member 10 occupying the first position, and is peeled off from the divided plate-making master 65 on the outer peripheral surface of the plate cylinder by one of the peeling claws 84. The peeled printed paper PB falls downward and is sent to the paper discharge transport unit 85, and is transported to the left while being attracted to the upper surface of the endless belt 89 by the suction force of the suction fan 90, and is discharged to the paper discharge tray. 86 is discharged. Thereafter, the plate cylinder 12 is rotated to the home position again and stopped, and the stencil duplex printing apparatus 1 enters a printing standby state after finishing the plate setting operation.

  At the time of the above-described printing, a predetermined blank portion S is provided between the first plate-making image 65A and the second plate-making image 65B of the divided plate-making master 65, and the divided plate-making master 65 is on the outer peripheral surface of the plate cylinder 12. Since the intermediate area is formed when the paper is wound on the paper, the rear end of the second paper P sent from the paper supply unit 4 and the front end of the front surface printed paper PA sent from the refeed means 9 Is prevented from being polymerized, and good printing can be performed. Further, when the surface-printed paper PA is re-feeded from the re-feeding means 9, the ink from the surface-printed paper PA is re-applied to the surface of the press roller 13 by contacting the printing surface of the surface-printed paper PA. However, since the outer peripheral surface of the press roller 13 has ink repellency and the cleaning roller 26 cleans the outer peripheral surface of the press roller 13, the amount of retransfer ink from the surface-printed paper PA to the outer peripheral surface of the press roller 13 And the removal of retransfer ink from the outer peripheral surface of the press roller 13 is promoted, and retransfer of ink from the press roller 13 to the back surface of the paper P can be prevented during the following printing.

  After the stencil duplex printing apparatus 1 is in a print standby state, a trial printing is performed when the trial printing key 106 is pressed after inputting printing conditions using the printing speed setting key 113 and various keys on the operation panel 103. When the trial printing key 106 is pressed, the plate is rotated at a rotational speed corresponding to the printing speed set after the cam shaft 44 is moved to a position where the cam plate 43B can come into contact with the cam follower 41 as in the case of printing. The cylinder 12 is driven to rotate, and the switching member 10 is positioned at the second position as in the case of printing. After rotation of the plate cylinder 12 is started, the first sheet P is fed from the sheet feeding unit 4, and the fed first sheet P is temporarily stopped by the registration roller pair 71 and then set printing is performed. The sheet is fed at a predetermined timing according to the speed, and is pressed against the first plate-making image 65A of the divided plate-making master 65 by the press roller 13. The first sheet P that has been printed with a print image corresponding to the first plate-making image 65 </ b> A on the front surface to become a surface-printed sheet PA is peeled off from the divided plate-making master 65 on the outer peripheral surface of the plate cylinder by the switching member 10. While being guided to the auxiliary tray 8. The surface-printed paper PA conveyed on the auxiliary tray 8 is held in a state where the other end is in contact with the refeed positioning member 24 while being held on the endless belt 38 by the suction force of the suction fan 39.

  Thereafter, a press roller locking means (not shown) is actuated to hold the press roller 13 in the separated position, and the cam cam 44 is moved to a position where the step cam 49 rotates and the cam plate 43A can be brought into contact with the cam follower 41. After the movement, the operation of the press roller locking means (not shown) is released. The switching member 10 is displaced from the second position to the first position until the clamper 19b occupies a position corresponding to the switching member 10 again. At the same time as this operation, the second sheet P is fed from the sheet feeding unit 4, and the fed second sheet P is temporarily stopped by the registration roller pair 71 and then the first sheet. The paper is fed toward the printing unit 2 at the same timing as P.

The fed second sheet P is pressed against the first plate-making image 65A of the divided plate-making master 65 by the oscillating press roller 13, and a print image corresponding to the first plate-making image 65A is printed on the surface. The second paper P that has become the finished paper PB is guided to the paper discharge transport unit 85 by the switching member 10 occupying the first position. The printed paper PB is peeled off from the divided master-making master 65 by the peeling claw 84, falls downward, is transported by the paper discharge transport unit 85, and is discharged onto the paper discharge tray 86.
After the second sheet P is fed by the registration roller pair 71, the solenoid 33 is actuated at a predetermined timing according to the set printing speed, and the re-feed registration roller 23 is moved from the separation position to the pressure contact position. The surface-printed paper PA that has been displaced and temporarily stopped on the auxiliary tray 8 is brought into contact with the outer peripheral surface of the rotating press roller 13. The surface-printed paper PA is transported by the rotational force of the press roller 13, and is transported to the printing unit 2 while being in close contact with the outer peripheral surface of the press roller 13 by the refeed guide member 22.

  The conveyed front-side printed paper PA is pressed against the second plate-making image 65B of the divided plate-making master 65 by the oscillating press roller 13, and the image corresponding to the second plate-making image 65B is transferred to the back surface thereof. The first sheet P, which has been printed on both sides with images corresponding to the plate-making images 65A and 65B to become a printed sheet PB, is guided by the switching member 10 to the discharge conveyance unit 85. Thereafter, the printed paper PB is peeled off from the divided plate-making master 65 by the peeling claw 84, transported by the paper discharge transport unit 85, and discharged onto the paper discharge tray 86, thereby completing the test printing.

In the present embodiment, the signal relating to the number of printed sheets used for printing and trial printing counted by the paper discharge sensor 150 at the time of printing and trial printing is invalidated by the CPU 130 of the control means 129, and the conventional technique. As with, the number of printed sheets is not counted as a regular number.
Note that the number of printed sheets at the time of printing, including “plate change” described later, is cleared at the time of making a new master and is not cleared until the next plate making, but is added for each printing and stored in the RAM 132. By adding the values during additional printing and trial printing, it is possible to correct the double-sided printing position deviation correctly. When the “plate change” is performed by winding the divided plate-making master on which the same plate-making image as the divided plate-making master is wound around the plate cylinder 12, the number of prints at the time of printing is naturally cleared (hereinafter referred to as “No. 1”). The same applies to the modification of the first embodiment.

At the time of the above-described trial printing, the position of the surface print image transferred and formed on the surface of the paper P corresponding to the first plate making image 65A of the divided plate making master 65 (hereinafter also referred to as “surface print image position”). When it is desired to move or shift in the paper transport direction, the front surface print image position is adjusted on the operation panel 103. The front surface print image position is adjusted by the left key 114c and the right key 114d. When the current position (unadjusted position) is set to 0 and moved to the downstream side in the paper transport direction, the left key 114c is pressed. When moving to the upstream side in the transport direction, the adjustment amount displayed on the display device 120 is input in units of 0.25 mm using the right key 114d.
When the print start key 105 is pressed after the movement amount is input, the top / bottom movement motor 259 of the phase displacement means (not shown) is operated in the surface / top / bottom movement means 250, and the registration roller pair 71 with respect to the phase of the plate cylinder 12 as described above. The operation timing is changed, and the front surface print image position is adjusted according to the set movement amount.

Further, at the time of the above-described trial printing, the position of the back side printed image transferred and formed on the back side of the front side printed paper PB corresponding to the second plate making image 65B of the divided master plate 65 (hereinafter referred to as “back side printed image position”). ”) Is also moved / shifted in the paper transport direction, the back side print image position is adjusted on the operation panel 103. The adjustment of the back side print image position is performed by the left key 214c and the right key 214d. When the current position (unadjusted position) is set to 0, the left key 214c is moved to the downstream side in the paper transport direction. When moving to the upstream side in the transport direction, the right key 214d is used to input the adjustment amount displayed on the display device 120 in units of 0.25 mm.
When the print start key 105 is pressed after the movement amount is input, the vertical movement adjustment of the back image position with respect to the front-side printed paper PA is adjusted by the operation timing of the solenoid 33 in the refeed means 9, in other words, the refeed resist. The pressing / on timing of the roller 23 to the press roller 13 is changed by an amount corresponding to the adjustment amount set by the left key 214c or the right key 214d.
For example, when it is desired to move the back image position downstream (upward) in the paper conveyance direction with respect to the front-side printed paper PA, the set adjustment amount is set by comparing the operation timing (on timing) of the solenoid 33 with the reference timing. In contrast to this, if the operation timing of the solenoid 33 is increased according to the set adjustment amount compared with the reference timing, the upstream side in the sheet conveyance direction with respect to the front-side printed sheet PA The back image position can be moved in the (ground direction). As described above, the operation for adjusting the movement amount of the back surface image position is performed by visually confirming the top and bottom movement amount displayed on the display device 120 of the operation panel 103, similarly to that of the conventional single-sided printing press. 103 can be performed easily and easily by appropriately operating one of the left key 214c and the right key 214d.

When the position or density of the image is confirmed by trial printing and the print start key 105 is pressed after the number of prints is input by the ten key 105, a printing operation is performed. In the first embodiment, a case where N sheets are input as the number of prints will be described.
When the print start key 105 is pressed, at the printing speed set after the cam shaft 44 is moved to a position where the cam plate 43B can come into contact with the cam follower 41 as in the case of printing and test printing. The plate cylinder 12 is driven to rotate, and the switching member 10 is positioned at the second position as in the case of printing and test printing. After the plate cylinder 12 starts rotating, the first sheet P is fed from the sheet feeding unit 4, and the fed first sheet P is temporarily stopped by the registration roller pair 71 and then at the same timing as the trial printing. It is sent by. The first sheet P is pressed against the first plate-making image 65A of the divided plate-making master 65 by the press roller 13, so that an image corresponding to the first plate-making image 65A is printed on the surface of the first sheet P. It becomes the printed paper PA. The surface-printed paper PA is peeled and guided by the switching member 10 occupying the second position, conveyed onto the auxiliary tray 8, and stopped with the other end in contact with the refeed positioning member 24.

  After that, the press roller locking means (not shown) is actuated to hold the press roller 13 in the separated position, and the cam shaft 44 is moved to a position where the cam plate 43A can come into contact with the cam follower 41. The operation of the press roller locking means is released. Also, almost simultaneously with this operation, the second sheet P is fed from the sheet feeding unit 4 and the second sheet P is temporarily stopped by the registration roller pair 71 and then at the same timing as the first sheet P. It is fed toward the printing unit 2. The switching member 10 is positioned at the first position so as to avoid a collision with the clamper 19b, and is then positioned again at the second position after passing through the clamper 19b.

  The fed second sheet P is pressed against the first plate-making image 65A of the divided plate-making master 65 by the press roller 13, and an image corresponding to the first plate-making image 65A is printed on the front surface. After the printed paper PA is obtained, it is guided to be peeled off by the switching member 10 occupying the second position and conveyed onto the auxiliary tray 8. At this time, the solenoid 33 is actuated at the same timing as the trial printing, and the first front surface printed paper PA stopped on the auxiliary tray 8 is conveyed to the printing unit 2 by the rotational force of the press roller 13. . In the first surface-printed paper PA, after the rear end of the second surface-printed paper PA has passed through the printing nip between the plate cylinder 12 and the press roller 13, the intermediate area of the plate cylinder 12 is the press roller. 13 is sent to a printing nip portion between the plate cylinder 12 and the press roller 13 at a timing when the back surface region faces the press roller 13 through a position facing the roller 13, and the second plate-making image of the divided plate-making master 65 by the press roller 13. By being in pressure contact with 65B, an image corresponding to the second plate-making image 65B is printed on the back surface of the printed paper PB.

  During the above-described operation, the solenoid 123 is actuated immediately before the intermediate region of the plate cylinder 12 occupies the position facing the press roller 13, and the switching member 10 is displaced from the second position to the first position. Thus, the rear end (the other end) of the second front surface printed paper PA guided by the switching member 10 passes through a slight gap between the lower surface 10 a of the switching member 10 and the outer peripheral surface of the press roller 13. Then, the leading end (one end) of the first printed sheet PB that has been guided onto the auxiliary tray 8 and subsequently conveyed is guided along the upper surface 10 b of the switching member 10 to the paper discharge conveying unit 85. . The first printed paper PB is peeled off from the divided plate-making master 65 by the peeling claw 84, then transported by the paper discharge transport unit 85, and discharged onto the paper discharge tray 86.

  After that, the third sheet P is fed from the sheet feeding unit 4, and the third sheet P is temporarily stopped by the registration roller pair 71 and then printed at the same timing as the first and second sheets P. It is fed toward part 2. The switching member 10 is positioned at the first position to avoid a collision with the clamper 19b, and is positioned again at the second position after passing through the clamper 19b. The fed third sheet P is printed on the front surface with an image corresponding to the first plate-making image 65 </ b> A to become a surface-printed sheet PA, and is then guided onto the auxiliary tray 8 by the switching member 10. Then, the solenoid 33 is actuated at a predetermined timing, and the second surface-printed paper PA stopped on the auxiliary tray 8 is conveyed to the printing unit 2.

  The second front-side printed paper PA is sent to the printing nip portion between the plate cylinder 12 and the press roller 13 at the same timing as the first front-side printed paper PA, and corresponds to the second plate-making image 65B on the back side. The printed image is printed and becomes the second printed paper PB. The switching member 10 is displaced from the second position to the first position at the same timing as described above, and the rear end (the other end) of the third surface printed paper PA is the lower surface 10a of the switching member 10 and the press roller 13. It is guided on the auxiliary tray 8 through a slight gap between the outer peripheral surface of the auxiliary tray 8 and the auxiliary tray 8. Following this, the leading end (one end) of the second printed sheet PB conveyed from the auxiliary tray 8 is guided along the upper surface 10b of the switching member 10 to the paper discharge conveying unit 85. The printed paper PB of the eyes is peeled off from the divided plate-making master 65 by the peeling claw 84, transported by the paper discharge transport unit 85, and discharged onto the paper discharge tray 86.

  Thereafter, the same printing operation as described above is performed up to the (N-1) th sheet. Then, the Nth sheet P is fed from the sheet feeding unit 4, and an image corresponding to the first plate-making image 65A is printed on the surface thereof, and is guided onto the auxiliary tray 8 as the Nth surface printed sheet PA. After that, the (N−1) th front-side printed paper PA is printed with an image corresponding to the second plate-making image on the back side thereof as the (N−1) th printed paper PB on the discharge tray 86. Then, the press roller locking means (not shown) is actuated to hold the press roller 13 at the separated position, and the cam shaft 44 is moved to a position where the cam plate 43C can be brought into contact with the cam follower 41. Thereafter, the operation of the press roller locking means (not shown) is released. At this time, the switching member 10 maintains the state of occupying the first position.

  Then, the cam follower 41 can be brought into contact with the cam follower 41 at the first timing earlier than the leading end of the image area of the second plate-making image 65B in the plate cylinder rotation direction of the divided plate-making master 65 reaches the position corresponding to the press roller 13. The cam plate 43 </ b> C moved to the position disengages the convex portion from the cam follower 41, and the press roller 13 presses the peripheral surface thereof against the outer peripheral surface of the plate cylinder 12 by the biasing force of the printing pressure spring 42. Thereafter, the second timing (according to the set printing speed) is slightly earlier than the leading edge of the image area of the second plate-making image 65B in the plate cylinder rotation direction of the divided plate-making master 65 reaches the position corresponding to the press roller 13. The solenoid 33 is actuated at a predetermined timing), and the swing arm 32 is swung in the clockwise direction in FIG. 2 about the support shaft 32a. As a result, the re-feeding registration roller 23 is swung from the separation position to the press-contact position, and the N-th surface printed paper PA that has been stopped with the other end in contact with the re-feeding positioning member 24 is printed on the plate. It abuts on the outer peripheral surface of the press roller 13 that abuts on the cylinder 12 and is driven to rotate.

  The N-th surface printed paper PA is sent to the printing nip portion between the plate cylinder 12 and the press roller 13 at the same timing as the first surface printed paper PA, and corresponds to the second plate-making image 65B on the back surface thereof. The printed image is printed and becomes the Nth printed paper PB. The Nth printed paper PB is guided to the paper discharge conveyance unit 85 along the upper surface 10 b of the switching member 10, and is peeled off from the divided plate-making master 65 by the peeling claw 84 and then conveyed by the paper discharge conveyance unit 85. The paper is discharged onto a paper discharge tray 86. Thereafter, when the press roller 13 finishes contact with the back surface region of the plate cylinder 12, the convex portion of the cam plate 43C comes into contact with the cam follower 41 to occupy the separated position. Due to the function of the cam plate 43C, the surface region of the plate cylinder 12 and the press roller 13 do not come into pressure contact with each other in the absence of the paper P, and ink transfer to the outer peripheral surface of the press roller 13 can be prevented. At this time, the press roller locking means (not shown) is operated to hold the press roller 13 in the separated position, and then the plate cylinder 12 stops at the home position, and the stencil duplex printing apparatus 1 finishes the printing operation and waits for printing again. It becomes.

  As described above, the stencil duplex printing apparatus 1 performs the following duplex printing operation. That is, at the time of duplex printing, the first sheet P is fed from the sheet feeding unit 4 to the printing unit 2, and the first platemaking image 65A and the second platemaking image 65B in the divided platemaking master 65 shown in FIG. Is printed, and the printed first surface-printed paper PA is guided to the auxiliary tray 8 of the paper refeed means 9 by the switching member 10, and then the second paper is fed from the paper feed unit 4. Sheet P is fed to the printing unit 2 and printing corresponding to one of the first plate-making image 65A and the second plate-making image 65B is performed on the surface, and the first surface is printed by the refeed unit 9 The paper PA is re-fed to the printing unit 2 and printing corresponding to one of the first plate-making image 65A and the second plate-making image 65B is performed on the back surface thereof, and the first double-side printed paper PB is printed by the switching member 10. To the paper discharge unit 6 for the second surface printed It was to guide each of the PA to the auxiliary tray 8.

After printing and appropriate test printing, the control means 129 performs the normal printing performed by pressing the print start key 105 after the number of prints is set by the ten key 105 of the operation panel 103 as described above. The following specific operations are performed.
That is, the CPU 130 determines that the number of printed sheets counted by the paper discharge sensor 150 is the predetermined number of printed sheets (first sheet, 101st sheet, 501st sheet, 1001st sheet, 2001) shown in FIGS. Each time, the front and back top movement correction values and back side top movement correction values corresponding to the predetermined number of prints from the ROM 131, that is, the first to the 100th prints after the start of regular printing are handled. The top-and-bottom movement correction value A1mm and the back-and-bottom movement correction value A2mm that are set in the above, the top-and-bottom movement correction value B1mm and the back-and-top movement correction value B2mm that are set in correspondence with the 101st sheet to the 500th sheet Front and back top movement correction value C1mm and back top and bottom movement correction value C2mm set corresponding to the first sheet, tables set corresponding to the 1001st sheet to the 2000th sheet The top-and-bottom movement correction value D1mm and the back-and-bottom movement correction value D2mm, and the top-and-bottom movement correction value E1mm and the back-and-bottom movement correction value E2mm set in correspondence with the 2001st sheet to the 3000th sheet are read and read out. The top / bottom movement motor 259 of the surface top / bottom movement means 250 (hereinafter referred to as “top / bottom movement motor 259”) is controlled so as to execute front / top / bottom movement correction in accordance with the correction value, and the read back / top / bottom movement correction is performed. Control the solenoid 33 (hereinafter referred to as “solenoid 33”) of the re-feeding registration roller contact / separation mechanism 160 (back-side up / down moving unit) in the re-feed unit 9 so as to execute the back-and-up side vertical movement correction according to the value. Will be.

The detailed operation content at this time is exemplified by the 100th printed sheet. First, the CPU 130 determines the plate cylinder based on the signal from the paper discharge sensor 150 and the signal from the home position sensor 48 regarding the 100th printed sheet. The plate cylinder driving means 121 is controlled so that 12 stops at the home position. Next, as shown in FIGS. 26 (a) to 26 (b), the initial deflection 65X and the initial elongation of the divided master-making master 65 alone are absorbed by the printing and the regular printing operation of the 100th sheet. Corresponding to this amount, the master position relative to the first plate-making image 65A of the divided plate-making master 65 in which the positional deviation has occurred on the upstream side in the rotational direction of the plate cylinder 12 (the phase lag side of the plate cylinder 12). In order to correct the deviation, the top / bottom movement motor 259 is operated and controlled so that the feeding timing of the driving roller 71a (registration roller pair 71) with respect to the phase of the plate cylinder 12 is delayed by the amount corresponding to the top / bottom movement correction value B1. For the second plate-making image 65B of the divided plate-making master 65, the re-feeding registration roller 23 is pressed against the outer peripheral surface of the press roller 13 in order to correct the master position deviation. Dynamic timing is done by controlling the on-timing of the solenoid 33 to be lower by an amount corresponding to the surface top-bottom shift correction value B1. As a result, the double-sided printing position is automatically corrected from the 101st sheet to the 500th sheet by the amount corresponding to the front and back movement correction value B1 and the back and top movement correction value B2.
Hereinafter, the front and back print images are the front and back print images, and the front and back top movement correction and the front and back top movement correction are the front and back top and bottom movement correction values. The vertical movement correction value may be described as “front / back vertical movement correction value”.

In other words, the rear end position of the divided master-making master 65 is shifted to the upstream side in the rotation direction of the plate cylinder 12, that is, the upstream side in the rotation direction of the plate cylinder 12 without performing the front / back surface top / bottom movement correction. When printing is performed as it is based on the divided master-making master 65 in which the deviation has occurred, the front and back print image positions are front and back tops up from the reference position in the paper transport direction on the paper to the upstream side (the ground direction) of the paper transport direction. Since the positional deviation is caused by the movement correction values B1 and B2, the feeding timing and the re-feeding of the registration roller pair 71 corresponding to the front / back side vertical movement correction values B1 and B2 to correct the double-sided printing positional deviation. By delaying the pressure contact timing of the registration roller 23 with respect to the press roller 13, the front and back side print image positions in the paper transport direction with respect to the paper are corrected to the original reference positions. And thus it is lifting.
In the present embodiment, the predetermined printing condition corresponds to a selection pattern N shown in FIG. 15 to be described later. As a specific numerical example of the front / back side top / bottom movement correction shown in FIG. Values A1, A2: 0.25, Front / back surface vertical movement correction values B1, B2: 0.50, Front / back surface vertical movement correction values C1, C2: 1.00, Front / back surface vertical movement correction values D1, D2: It is set to 1.25, front and back top and bottom movement correction values E1, E2: 1.50 (mm).

As described above, in the first embodiment, the plate cylinder 12 around which the divided plate-making master 65 is wound, and the surface printing transferred from the first plate-making image 65A of the divided plate-making master 65 on the plate cylinder 12 to the paper P. The position of the top and bottom moving means 250 that moves the position of the image in the paper conveyance direction, and the position of the back side printed image transferred from the second plate making image 65B of the divided plate making master 65 on the plate cylinder 12 to the back side of the surface printed paper PA In the double-sided printing method using the stencil double-sided printing apparatus 1 having the re-feeding registration roller contact / separation mechanism 160 (backside up / down moving unit) that moves the paper in the paper transport direction, the divided master-making master 65 in the rotational direction of the plate cylinder 12 is used. The front / back side top / bottom movement correction value corresponding to the master misalignment correction parameters including the number of prints that affects the position deviation is set in advance, and the front / back side top / bottom movement compensation value is set. Based on the value, during printing, the top and bottom surface moving means 250 automatically performs the top and bottom surface movement correction, and the re-feeding registration roller contact / separation mechanism 160 (back surface top and bottom moving means) automatically It can be said that the double-sided printing method for executing the vertical movement correction was used.
According to the first embodiment, as described above, the CPU 130 of the control unit 129 displays a table corresponding to a predetermined number of printed sheets from the ROM 131 every time the number of printed sheets counted by the paper discharge sensor 150 reaches a predetermined number of printed sheets. Read back surface up / down movement correction value and control top / bottom movement motor 259 to execute front / back surface top / bottom movement correction according to the read front / top surface movement correction value during printing, and read back side up / down movement Since the solenoid 33 is controlled so as to execute the backside up / down movement correction according to the correction value, even if the master position shift according to the number of prints occurs, the double-sided printing position shift is automatically corrected, so double-sided printing A double-sided printed product without misalignment can be obtained, waste of the master and paper can be eliminated, work time can be shortened, and work man-hours can be reduced.

(Modification 1 of the first embodiment)
With reference to FIG. 10 and FIG. 11, the modification 1 of 1st Embodiment is demonstrated.
The modification 1 is different from the first embodiment only in that the control unit 129 shown in FIG. 10 is added with the following calculation function in addition to the calculation and control function of the first embodiment. . The present modification is the same as the first embodiment except for the differences.
In other words, in addition to the calculation and control functions of the first embodiment, the control unit 129 includes the paper discharge sensor 150 in which the number of printed sheets is counted as the number of printed sheets within a predetermined number of printed sheets stored in the ROM 131. From the ROM 131, the front / back surface top / bottom movement correction value corresponding to the predetermined number of prints and the front / back surface top / bottom movement correction value corresponding to the next predetermined number of prints are obtained from the ROM 131. The top / bottom movement motor 259 is calculated so as to calculate a front / back surface top / bottom movement correction value for a predetermined number of prints corresponding to each print number, and to execute the surface top / bottom movement correction according to the calculated front / top / bottom movement correction value. In addition to controlling, the solenoid 33 is controlled so as to execute backside up / down movement correction according to the calculated backside up / down movement correction value.

  In the first embodiment, when executing the top / bottom movement correction according to the number of printed sheets at the time of printing, the front / back surface top / bottom movement correction value (hereinafter simply referred to as “front / back surface correction value” set within a predetermined print number range). However, the correction value corresponding to the number of printed sheets does not have data for each sheet, so that correction is made in stages. In other words, in FIG. 11, the normal printing number (hereinafter also simply referred to as “printing number”) from the first sheet to the 100th sheet is the front / back surface correction value A1, A2, and from the 101st sheet number to the 500th sheet. Front / back surface correction values B1, B2, front / back surface correction values C1, C2 from the 501st sheet to the 1000th sheet, front / back surface correction values D1, D2 from the 1001st sheet to the 2000th sheet, Since the number of printed sheets from the 2001th sheet to the 3000th sheet is the front / back surface correction values E1 and E2, the same front / back surface correction value is obtained in a group within a predetermined print number range.

Therefore, in this modified example, even if the front / back surface vertical movement correction value corresponding to the number of printed sheets as described above is assigned to each group within a predetermined printed number range, the table corresponding to the number of printed sheets per sheet is used.・ The back-and-top movement correction value is obtained by calculation. For example, when the control means 129 is made to execute the vertical movement correction according to the number of printed sheets 1500, it is assigned to a group of printed sheets 1001 to 2000 as a predetermined printed sheet range. The front / back surface correction values D1 and D2 and the front / back surface correction values E1 and E2 assigned to the groups of the number of printed sheets 2001 to 3000 as the next predetermined print number By using a mathematical interpolation method that considers that the front / back side top / bottom movement correction values corresponding to the number of prints per sheet are proportional, the front / back side top / bottom movement corresponding to the 1500th print as the predetermined number of prints The correction values F1 and F2 are calculated by calculation, and the front / back surface top / bottom movement correction corresponding to the calculated front / back surface top / bottom movement correction value is executed.
In order to make the control means 129 function so as to execute the finer front / back surface top / bottom movement correction as described above, by adding a programmable PROM or EPROM, a dedicated key is added to the operation panel 103, for example. Or various keys (such as numeric keypad 105, program key 111, enter key 110, selection setting keys 120a, 120b, 120c, and 120d) may be used in combination, or the ROM chip may be replaced. You may respond by doing.
Therefore, according to the first modification, it is possible to execute finer front / back surface top and bottom movement correction corresponding to a predetermined number of printed sheets per sheet within a predetermined number of printed sheets than in the first embodiment.

(Modification 2 of the first embodiment)
As described in the first embodiment, the master misalignment that occurs between the initial deflection 65X and the initial elongation of the divided master-making master 65 is absorbed under the same printing conditions. From a plurality of experiments, it has been found that there is a close correlation with the number of printed sheets. However, in practice, it has been confirmed through experiments that the front / back surface top / bottom movement correction values set differ depending on the relationship between the number of copies printed and the master position deviation, for example, when the master type or paper type used changes. Yes.
Therefore, in this modification, in addition to the number of printed sheets (main parameter for correcting the master position deviation) as a printing condition having a close correlation with the master position error, six printing conditions (sub parameters for correcting the master position error). ) To obtain more accurate front / back side top / bottom movement correction values closer to the printing conditions / environment of the actual machine and automatically execute front / back side top / bottom movement correction values.

A modification 2 of the first embodiment will be described with reference to FIGS.
In the second modification, the control unit 129A shown in FIG. 12 is used in place of the control unit 129 as compared with the first embodiment, and the main parameter for correcting the master position deviation that affects the master position deviation is used. In addition to the number of printed sheets, a pattern that combines six sub-parameters shown in FIG. 13 as printing conditions (or selection conditions), that is, sub-parameters of ink color, drum type, printing speed, paper type, ink temperature, and master type ( The main difference is that the front / back and top / bottom movement correction values (see FIG. 15) adjusted and set according to FIG. 14 are used. The present modification is the same as the first embodiment except for the differences. Hereinafter, the six sub-parameters will be sequentially described.
In this modification, for the sake of simplicity of explanation, the front / back surface top / bottom movement correction values obtained and set in advance by experiments in accordance with the combinations / selection patterns of all the six sub-parameters are used. The front / back side top / bottom movement correction can be performed by using the front / back side top / bottom movement correction value obtained in advance by experiment according to the number of printed sheets for each combination / selection pattern of at least one of the above six sub-parameters. Of course.

In the stencil duplex printing apparatus 1 of this modification, the above-described multi-color overprint printing of the six ink colors is possible, and the color change for each ink color can be easily performed by replacing the drum unit corresponding to the ink color. It is like that. The ink color, which is also the ink type, is one of six types of black ink, red ink, blue ink, green ink, straw ink, and purple ink shown in FIG. It can be set at 120b or can be detected by an ink color detection means described later.
A characteristic that affects the misregistration of the master due to the difference in ink color is a change in adhesive force due to the magnitude of the ink viscosity. That is, in general, an ink color having a large ink viscosity and a large adhesive force has a relatively small master displacement amount, and conversely, an ink color having a small ink viscosity and a small adhesive force has a relatively large master displacement amount. Focusing on this fact, the relationship between the number of printed sheets and the master position deviation amount is obtained by experiment for each ink color, and this is used as a clue to finally determine the front / back surface top / bottom movement correction value reflecting the adjustment value.

The printing unit 2 shown in FIG. 12 is provided with ink color detection means 302 that detects the ink color. As a specific example of the ink color detection means 302, as shown in FIG. 16 of JP-A-2004-155170, a magnet (130, 131, 132) arranged on the drum unit side and an apparatus main body side are arranged. This is the same as the ink type detecting means (135) having the Hall element sensors (136, 137, 138).
Note that both the selection setting key 120b and the ink color detection means 302 are not required, and any one of them may be provided. In a high-end model having both, for example, the output signal from the selection setting key 120b set manually may be validated and the output signal from the ink color detection means 302 may be invalidated. The same applies to various sub-parameter (printing condition) setting means and detection means described later. However, both the printing speed setting key 113 and the plate cylinder rotation angle sensor 152 are necessary.

In the stencil duplex printing apparatus 1 of this modification, the drum unit corresponding to the two types of drums described above can be easily replaced. The drum type is configured such that the A3 drum or the DLT drum shown in FIG.
The characteristic that affects the master position deviation depending on the drum type mainly includes changes in the length and opening area around which the master is wound. That is, in general, the A3 drum with a relatively small length and opening area for winding the master has a relatively small master displacement amount, and conversely, the DLT drum with a large length and opening area for winding the master has a master position displacement. Focusing on the relatively large amount, the relationship between the number of printed sheets and the master position deviation amount for each drum type was experimentally determined, and the front / back surface top / bottom movement correction value reflecting the adjustment value was finally determined. It is a clue to decide on.

  The printing unit 2 shown in FIG. 12 is provided with drum type detecting means 303 for detecting the drum type. As a specific example of the drum type detecting means 303, the drum type detecting means 303 is configured to be electrically detectable by a difference in connection terminals between an electric connector female provided on the apparatus main body 11 side and an electric connector male provided on the drum unit side. Yes. However, the present invention is not limited to this, and the same ink color detection means 302 may be applied.

  The printing speed affects the master position deviation due to the slow speed. That is, when the printing speed is relatively slow, the time during which the paper P is pressed against the divided plate-making master 65 on the plate cylinder 12 becomes long, the master position deviation amount increases, and when the printing speed is relatively fast, The pressing time is shortened and the master position deviation amount tends to be reduced. By paying attention to this, the relationship between the number of printed sheets and the master position deviation amount for each printing speed is obtained through experiments, and this is used as a clue to finally determine the front / back surface top / bottom movement correction value reflecting the adjustment value.

As the paper type, any one of the thin paper, the standard paper, and the thick paper shown in FIG. 13 can be set by the selection setting key 120c of the operation panel 103, or can be detected by the paper type detecting means described later.
Thickness is mainly given as a characteristic that affects the master position deviation depending on the paper type. That is, in the case of thick paper, the pressure contact force in the pulling direction with respect to the divided master plate master 65 on the plate cylinder 12 becomes relatively large. Since the pressure contact force is relatively small, as a result, the amount of master position deviation is reduced. Focusing on this, a relationship between the number of printed sheets and the master position deviation amount is obtained by experiment for each paper type, and this is used as a clue to finally determine the front / back surface top / bottom movement correction value reflecting the adjustment value.

  The paper feed unit 4 shown in FIG. 12 is provided with paper type detection means 304 for detecting the paper type. As a specific example of the paper type detection unit 304, one that detects the thickness of the paper based on the amount of transmitted light or a known detection unit that measures the thickness itself is used.

  The ink temperature affects the master misregistration due to its height. That is, generally, the higher the ink temperature, the lower the ink viscosity and the lower the adhesive strength, so that the master misregistration amount becomes relatively large, and conversely, the lower the ink temperature, the higher the ink viscosity. As the force increases, the master position shift amount becomes relatively small. By paying attention to this, the relationship between the number of printed sheets and the master position deviation amount for each ink temperature is obtained by experiment, and this is used as a clue to finally determine the front / back surface top / bottom movement correction value reflecting the adjustment value. The ink temperature setting range was set in three stages: low temperature: 18 ° C. or less ((0) to 18 ° C.), normal temperature: 19 to 29 ° C., and high temperature of 30 ° C. or more (30 to (40) ° C.).

As the master type, any one of A (standard) master, B (endurance) master, and C (cost reduction) master shown in FIG. 13 can be set by the selection setting key 120a of the operation panel 103, or a master described later. It can be detected by the type detecting means.
The master type affects the master position deviation due to the difference in the degree of elongation (elongation rate) of the master alone. The degree of elongation (elongation rate) of the master alone increases in this order of B (endurance), A (standard), and C (cost reduction) and tends to grow. A relationship with the amount of positional deviation is obtained through experiments, and this is a clue to finally determine the vertical movement correction value that reflects the adjustment value.

In the plate making unit 3 shown in FIG. 12, a master type detecting means 300 for detecting the master type is arranged. A specific example of the master type detection unit 300 is the same as the master type detection unit (141) shown in FIG. 17 of Japanese Patent Application Laid-Open No. 2004-155170. That is, the master type detecting means 300 detects the type of the master 65 that has been divided and made when the core portion of the master roll 23a shown in FIG. 1 is set on the master holding member 16, and the leading end of the master roll 23a is pulled out. The identification display body (142) shown in FIG. 17 of the above-mentioned publication affixed to the section and the three reflections shown in FIG. 17 of the above publication as detection means for detecting the contents displayed on the identification display body (142) This is a publicly-known configuration configured with a photosensor (143) of a type.
The master type detection means 300 is not limited to the one described above, and is constituted by the IC tag (144) and the reception means (145) shown in FIG. 19 of the above publication, or the resonance tag on the master roll 23a side. Or the like, or the capacitance may be detected and the master type may be detected based on the value.

FIG. 14 shows a part of selection patterns 1 to 10 and N as a specific example in which the above-described ink color, drum type, paper type, master type, ink temperature setting range, and printing speed subparameters are combined. In FIG. 10, the relationship between the number of printed sheets and the master position deviation is obtained for each of the selected patterns 1 to 10 and N based on the experimental results. : A part set as a unit mm) is shown. In this example, the vertical movement correction values of the selection patterns 1 to 10 and N for every 100 printed sheets are described in detail, but of course the selection patterns 1 to 10 for each rough printed sheet as shown in FIG. The vertical movement correction value may be used. In this case, as described in the first modification, the front / back surface top / bottom movement correction values of the selection patterns 1 to 10 and N corresponding to the number of printed sheets required for calculation by the CPU 130 may be calculated.
The selection pattern N represents a pattern in which the predetermined printing conditions and parameters described in the first embodiment are combined.

As shown in FIG. 12, the control unit 129A of this modification is different from the control unit 129 shown in FIG. 10 only in using a CPU 130A instead of the CPU 130 and using a ROM 131A instead of the ROM 131. . Compared to the ROM 131 shown in FIG. 10, the ROM 131A replaces the data table of the top and bottom movement correction value shown in FIG. 11 and the data table regarding the setting contents of the selection pattern shown in FIG. 14 and the data table shown in FIG. The only difference is that the data table of the front / back side vertical movement correction values set by the selection pattern for each number of printed sheets is stored in advance. As described above, the ROM 131 </ b> A has a function as a storage unit that stores a front / back surface top / bottom movement correction value set in advance by an experiment using a combination of six types of parameters for each predetermined number of printed sheets.
If the user desires to change the selection patterns 1 to 10 and N of the data table shown in FIG. 15 and the front / back surface top / bottom movement correction value set for each predetermined number of prints, The contents of the data table may be stored in a programmable PROM or the like, and may be varied in the same manner as described above by combinations of various keys on the operation panel.

  The CPU 130A functions in place of the CPU 130 shown in FIG. 10, that is, during normal printing similar to that described above, the selection setting key 120b or the ink color detection means 302, the selection setting key 120d or the drum type detection means 303, and the selection setting. Based on output signals from the key 120c or the paper type detection means 304, the selection setting key 120a or the master type detection means 300, the temperature sensor 301, the printing speed setting key 113, and the plate cylinder rotation angle sensor 152, and the paper discharge sensor 150. Each time the number of printed sheets counted by the above becomes the predetermined number of printed sheets shown in FIG. 10, the data table shown in FIGS. 14 and 15 stored in the ROM 131A and the output signals are collated. The selected pattern and the above-mentioned predetermined print The top / bottom movement correction value corresponding to the number is read, and the top / bottom movement motor 259 is controlled to execute the front / top movement correction value corresponding to the read front / top movement correction value. It has a function of controlling the solenoid 33 so as to execute backside vertical movement correction according to the movement correction value.

  Therefore, according to the second modification, the table corresponding to the front / back surface top / bottom movement correction value closer to the printing condition of the actual machine than the first embodiment, in which printing conditions (sub-parameters) other than the number of printed sheets are considered and taken into consideration.・ Backside top / bottom movement correction can be executed.

If the front / back side vertical movement correction value corresponding to the front / back side vertical movement correction value close to the printing conditions of the actual machine as described above is not required, the following single printing condition (sub parameter) or It has a means to set or detect each characteristic value that combines at least a plurality of printing conditions (sub-parameters), taking into account the characteristic value set or detected by that means, front and back top and bottom movement correction value (adjustment value) And a control configuration example for executing front / back surface up / down movement correction. In the following, the contents described focusing only on the function of the CPU are listed by borrowing the symbols shown in FIG.
The CPU 130A of the control unit 129A determines that the number of prints counted by the paper discharge sensor 150 based on the output signal from the selection setting key 120b or the ink color detection unit 302 is a predetermined number during normal printing similar to the above. Each time the number of printed sheets is reached, the ink color is taken into consideration by comparing the output table with the data table stored in the ROM 131A (considering ink color, taking into account / adding the correction value for each printed sheet). The front / rear top / bottom movement correction value corresponding to the predetermined number of prints taken into account is read, and the top / bottom movement motor 259 is controlled to execute the front / rear top / bottom movement correction according to the read front / top / bottom movement correction value. In addition, it has a function of controlling the solenoid 33 so as to execute back surface up / down movement correction according to the read back surface up / down movement correction value. It may be a shall (first control arrangement example).

  During regular printing similar to the above, the CPU 130A of the control unit 129A determines the number of prints counted by the discharge sensor 150 based on the output signal from the selection setting key 120d or the drum type detection unit 303. Each time the number of printed sheets is reached, the data type stored in the ROM 131A (considering drum type / front / back surface top / bottom movement correction value for each printed number) and the above output signal are collated to consider the drum type. The front / rear top / bottom movement correction value corresponding to the predetermined number of prints taken into account is read, and the top / bottom movement motor 259 is controlled to execute the front / rear top / bottom movement correction according to the read front / top / bottom movement correction value. At the same time, a device for controlling the solenoid 33 so as to execute the backside up / down movement correction according to the read backside up / down movement correction value. It may be one having a (second control arrangement example).

  The CPU 130A of the control means 129A determines that the number of prints counted by the paper discharge sensor 150 based on the output signal from the selection setting key 120c or the paper type detection means 304 during the normal printing as described above is a predetermined value. Each time the number of printed sheets is reached, the sheet type is considered by comparing the data table (front / back side top / bottom movement correction value for each number of printed sheets taking into account and taking into account the sheet type) with the output signal. The front / rear top / bottom movement correction value corresponding to the predetermined number of prints taken into account is read, and the top / bottom movement motor 259 is controlled to execute the front / rear top / bottom movement correction according to the read front / top / bottom movement correction value. In addition, it has a function of controlling the solenoid 33 so as to execute the backside up / down movement correction according to the read backside up / down movement correction value. It may be a shall (third control example configuration).

  The CPU 130A of the control unit 129A determines that the number of prints counted by the paper discharge sensor 150 based on the output signal from the selection setting key 120a or the master type detection unit 300 is a predetermined number during normal printing similar to the above. Each time the number of printed sheets is reached, the master type is considered by comparing the data table (front / back side top / bottom movement correction value for each number of printed sheets taking into account and taking into account the master type) with the output signal. The front / rear top / bottom movement correction value corresponding to the predetermined number of prints taken into account is read, and the top / bottom movement motor 259 is controlled to execute the front / rear top / bottom movement correction according to the read front / top / bottom movement correction value. At the same time, a device for controlling the solenoid 33 so as to execute the backside up / down movement correction according to the read backside up / down movement correction value. It may be one having a (fourth control example configuration).

  During regular printing similar to the above, the CPU 130A of the control means 129A is based on the output signal from the temperature sensor 301 and whenever the number of printed sheets counted by the paper discharge sensor 150 reaches a predetermined number of printed sheets. By comparing the output table with the data table stored in the ROM 131A (front / back top / bottom movement correction value for each number of printed sheets taking into account and taking into account the ink temperature), the above-mentioned predetermined value in which the ink temperature has been taken into account and taken into account. The top / bottom movement correction value corresponding to the number of printed sheets is read, the top / bottom movement motor 259 is controlled to execute the front / top movement correction value according to the read front / top movement correction value, and the read back surface It may have a function of controlling the solenoid 33 so as to execute backside upside down movement correction according to the upside down movement correction value (fifth). Control configuration example).

  The CPU 130A of the control unit 129A prints the number of prints counted by the paper discharge sensor 150 based on the output signals from the printing speed setting key 113 and the plate cylinder rotation angle sensor 152 during normal printing as described above. By comparing the output table with the data table stored in the ROM 131A (front / back top / bottom movement correction value for each print number considering and taking into account the print speed) each time The top / bottom movement motor reads out the front / back surface top / bottom movement correction values corresponding to the predetermined number of prints in consideration and the printing speed, and executes the top / bottom top / bottom movement correction values according to the read front / top / bottom movement correction values. 259 is controlled, and the solenoid 33 is controlled so as to execute the backside up / down movement correction according to the read backside up / down movement correction value. It may be one having an ability (control configuration example of a sixth).

In the above-described first embodiment, modifications 1 and 2, etc., the front / back side top / bottom movement correction is automatically executed by the control means during printing. When printing is performed using correction, the double-sided printing position may not be adjusted well for some reason. In such a case, it is preferable to provide switching means for the user to switch whether or not the above-described front / back surface top / bottom movement correction by the control means is necessary according to his / her preference and necessity.
As the switching means, for example, the presence or absence of automatic front / back surface top / bottom movement correction is programmed as an initial setting and put in a ROM or EPROM, and switched by a combination of various keys on the operation panel, or a dedicated key is provided. Thus, there is a means for enabling the user to switch.
Therefore, according to the above example, the user can switch whether or not the front / back surface top / bottom movement correction by the control means is necessary according to his / her preference and necessity, and the operation / convenience of the stencil duplex printing apparatus is improved.

(Second Embodiment)
16 and 17 show a second embodiment. Compared with the first embodiment shown in FIGS. 1 to 11, the second embodiment is divided plate making on the plate cylinder 12 instead of the paper discharge sensor 150 as shown in FIGS. 16 and 17. The main difference is that a master rear end sensor 153 as a master rear end detection means for detecting the position of the rear end 65Y of the finished master 65 is used, and a control means 129B is used instead of the control means 129. Other configurations are the same as those of the stencil duplex printing apparatus 1 of the first embodiment. Note that reference numerals 154 and 155 shown in parentheses in FIG. 16 are used in third and fourth embodiments to be described later for the sake of simplification of description, and in the second embodiment, Note that there is nothing.
The master rear end sensor 153 includes, for example, a reflection type photosensor. As shown in FIG. 16, up to the rear end (upstream end) of the opening in the rotational direction of the plate cylinder 12, the divided plate-making master 65 is attached to the outer peripheral surface of the plate cylinder 12 by the adhesive force of the ink leached from the opening. However, the rear end portion 65Z of the divided master plate master 65 located after the rear end of the opening of the plate cylinder 12 is not attached to the outer peripheral surface of the plate cylinder 12, and is free to lift from the outer peripheral surface of the plate cylinder 12. It is in a state. The master rear end sensor 153 is located in the vicinity of the position of the rear end 65Y of the divided plate-making master 65 so as to detect the position (rear end position) of the rear end 65Y of the divided plate-making master 65 on the plate cylinder 12. It is attached and fixed to the main unit through a sensor bracket that does not.

  As shown in FIG. 17, the control unit 129B of this embodiment is mainly different from the control unit 129 shown in FIG. 10 in that a CPU 130B instead of the CPU 130 is used and a ROM 131B instead of the ROM 131 is used. To do. Compared with the ROM 131 shown in FIG. 10, the ROM 131 </ b> B replaces the front / back surface top / bottom movement correction value data table shown in FIG. 11 with a calculation program and a table for exhibiting a specific calculation function described later of the CPU 130 </ b> B. The only difference is that the front / back side top / bottom movement correction threshold value and the like related to the master position shift amount for determining the necessity of back / upside down movement correction are stored in advance.

The CPU 130B functions in place of the CPU 130 shown in FIG. 10, that is, at the position of the rear end 65Y of the divided plate-making master 65 on the plate cylinder 12 from the master rear end sensor 153 during normal printing as described above. The front / rear top / bottom movement correction value is calculated by calculation from the master rear end position data signal and the like, and the top / bottom movement motor 259 is controlled to execute the surface top / bottom movement correction according to the calculated surface top / bottom movement correction value. The solenoid 33 is controlled so as to execute the backside up / down movement correction according to the calculated backside up / down movement correction value.
The CPU 130B calculates the peripheral speed of the plate cylinder 12 from the printing speed data transmitted from the plate cylinder rotation angle sensor 152 and the diameter of the plate cylinder 12 in order to calculate the front / back surface vertical movement correction value from the master rear end position data. The calculated peripheral speed value, the position data of the tip of the divided master-making master 65 transmitted from the home position sensor 135, and the time measurement data (during one rotation of the plate cylinder 12) transmitted from the timer 133, that is, the home position sensor Based on the time measurement data from the leading edge position of the master 65 starting from 135 to the master trailing edge position detected by the master trailing edge sensor 153, the leading edge position from the leading edge position of the divided plate-making master 65 on the plate cylinder 12 is determined. The length to the position (hereinafter also referred to as “the rear end position length of the divided master-making master 65”) can be obtained. Then, the CPU 130B performs the above calculation for each rotation (number of printed sheets) of the plate cylinder 12 during regular printing, and the divided pre-printed master in the previous printing and the current printing from the beginning of regular printing. 65, the difference in the rear end position length, that is, the master position deviation amount for each rotation (number of printed sheets) of the plate cylinder 12 is obtained, and this master position deviation amount is stored in advance in the ROM 131B. When the difference between the rear end position length of the divided plate-making master 65 in the previous printing and the rear end position length of the divided plate-making master 65 in the current printing exceeds And the above-described front / back surface top / bottom movement correction value corresponding to the front / back surface top / bottom movement correction value are executed.

Therefore, according to the second embodiment, the CPU 130B of the control unit 129B causes the position data of the front end of the divided plate-making master 65 transmitted from the home position sensor 135 and the master rear end sensor 153 to be transmitted during regular printing. A master position deviation amount is calculated by calculation from the master rear end position data relating to the rear end position of the divided master-making master 65 on the plate cylinder 12, and this is regarded as a front / back surface top / bottom movement correction value. Since the top / bottom movement motor 259 and the solenoid 33 are controlled so as to execute the front / back surface top / bottom movement correction according to the back / top / bottom movement correction value, even if the master position shift occurs, the double-sided printing position shift is automatically corrected. Therefore, it is possible to obtain a double-sided printed product with no misalignment in double-sided printing, eliminating waste of masters and paper and reducing work time. It is possible to reduce the man-hours.
In the second embodiment, the amount of master position deviation is obtained by calculation from detection / measurement of the rear end position of the divided plate-making master 65 on the plate cylinder 12 as a result of reflecting actual printing conditions of the actual machine. Therefore, in order to obtain a master position deviation amount according to the number of printed sheets and for each parameter such as the master type and the paper type, a large number of man-hours are required as in the second embodiment, the first modification, and the second modification. There is also an advantage that the need for a troublesome act of storing the various data thus obtained in the ROM 131 and the ROM 131A is eliminated. Therefore, in the present embodiment, it is important to configure so that the rear end position of the divided master-making master 65 on the plate cylinder 12 can be accurately detected and measured (third and fourth implementations described later). The same applies to the form and modified examples thereof).

(Modification 3 of the second embodiment)
The rear end 65Y of the divided plate-making master 65 on the plate cylinder 12 is not attached to the outer peripheral surface of the plate cylinder 12 as shown in FIG. Therefore, it is difficult to accurately detect and measure the rear end position of the divided plate-making master 65 on the plate cylinder 12. Therefore, Modification 3 of the second embodiment was created.
FIG. 18 shows a third modification of the second embodiment. As compared with the second embodiment shown in FIGS. 16 and 17, the modified example 3 is arranged such that the arrangement position of the master rear end sensor 153 is the nip between the plate cylinder 12 and the press roller 13 as shown in FIG. 18. The only difference is that the plate cylinder 12 is changed to the outside of the outer peripheral surface in the vicinity of the portion (clamping portion). Note that reference numeral 155 shown in parentheses in FIG. 18 is used in modified examples of the third and fourth embodiments described later for the sake of simplification of description, and is not of this modified example 3. I will note that.

As shown in FIG. 18, when the printing pressure is applied by the press roller 13 during printing, the printing pressure range (pressing range) by the pressing roller 13 is set so that the printing pressure is applied to the rear end 65Y of the divided plate-making master 65. It is good to make it the structure extended to 12 rotation direction upstream. As a result, the rear end position of the divided plate-making master 65 on the plate cylinder 12 becomes more stable than that of the second embodiment, and the master is located near the nip portion between the plate cylinder 12 and the press roller 13. By arranging the rear end sensor 153, the position of the rear end 65Y of the divided master-making master 65 on the plate cylinder 12 can be accurately detected and measured.
Therefore, according to the third modification, the above-described problem of the second embodiment is solved, and the rear end position of the divided plate-making master 65 on the plate cylinder 12 is more stable than that of the second embodiment. Since it is possible to accurately detect and measure and calculate, accurate front / back surface top and bottom movement correction can be executed.

(Modification 4 of the second embodiment)
In the third modification described above, in order to accurately measure the rear end position of the divided plate-making master 65 on the plate cylinder, as shown in FIG. When arranged outside the outer peripheral surface of the plate cylinder 12 in the vicinity of the nip portion (clamping portion), as shown in the figure, when the press roller 13 rises and swings and applies printing pressure during printing, Printing pressure is applied up to the rear end 65Y. However, disposing the master rear end sensor 153 at the nip where the plate cylinder 12 and the press roller 13 are in contact is before and after the nip position in terms of layout (downstream or upstream in the paper transport direction across the nip). Therefore, it is difficult to accurately detect and measure the rear end position of the divided master-making master 65 in consideration of paper conveyance. Therefore, Modification 4 of the second embodiment was created to solve this problem.

FIG. 19 shows a fourth modification of the second embodiment. As compared with the third modification shown in FIG. 18, in the fourth modification, as shown in FIG. 19, the arrangement position of the master rear end sensor 153 is changed to the nip part (clamping part) between the plate cylinder 12 and the press roller 13. The rear end 65Y of the divided plate-making master 65 located outside the outer peripheral surface of the plate cylinder 12 in the vicinity and outside the plate cylinder width direction in the opening 12a of the plate cylinder 12, that is, in the non-opening portion 12b in the plate cylinder width direction. The only difference is that they are arranged so that they can be detected. Thereby, the problem of the modified example 3 is solved, and the position of the rear end 65Y of the divided master-making master 65 on the plate cylinder 12 can be accurately detected and measured.
Therefore, according to the modified example 4, the above-described problem of the modified example 3 is solved, and the rear end position of the divided plate-making master 65 on the plate cylinder 12 is detected and measured more accurately than the modified example 3 and calculated. As a result, more accurate front / back surface top / bottom movement correction can be executed. Note that reference numerals 154 and 155 shown in parentheses in FIG. 19 are used in modified examples of the third and fourth embodiments described later for the sake of simplification of description. Note that this is not the case.

(Modification 5 of the second embodiment)
FIG. 20 shows a fifth modification of the second embodiment. As compared with the second embodiment shown in FIGS. 16 and 17, the modified example 5 uses a signal related to the number of prints from the paper discharge sensor 150, and instead of the control unit 129, the control unit 129 </ b> C is used. The only difference is the use of.
Control means 129C of the present embodiment, as shown in FIG. 20, as compared with the control means 129B shown in FIG. 17, the point of using the CPU130C was replaced with CPU130B, mainly the point of using the ROM 131C was replaced with ROM131B Is different.

The ROM 131C is different from the ROM 131B shown in FIG. 17 only in that a calculation program for exhibiting a specific calculation function described later of the CPU 130C is stored in advance.
The CPU 130C functions in place of the CPU 130B shown in FIG. 17, that is, during regular printing similar to that described above, every time a signal related to the number of printed sheets from the paper discharge sensor 150 reaches a predetermined number of printed sheets. The front / back surface top / bottom movement correction value is calculated from the master rear end position data signal related to the rear end position of the divided master-making master 65 on the plate cylinder 12 from the master rear end sensor 153, and the calculated surface top and bottom are calculated. A function of controlling the top / bottom movement motor 259 so as to execute the top / bottom movement correction according to the movement correction value, and controlling the solenoid 33 so as to execute the back / bottom movement correction according to the calculated back / top movement correction value. Have The contents calculated by the CPU 130C by calculating the front / back surface top / bottom movement correction value from the master rear end position data and the like are the same as those of the CPU 130B shown in FIG.

  Therefore, according to the fifth modification example, the CPU 130C of the control unit 129C causes the process shown in FIG. 17 every time a predetermined number of prints (for example, the same number as shown in FIG. 11) is set during normal printing. Since the calculation similar to the CPU 130B shown in the figure is performed, and the top / bottom movement motor 259 and the solenoid 33 are controlled to execute the front / back surface top / bottom movement correction according to the calculated front / back surface top / bottom movement correction value, FIG. It is not necessary to perform a front / back side top / bottom movement correction command according to the calculated front / back side top / bottom movement correction value by performing the same calculation as described above for each printed sheet like the CPU 130B shown in FIG. Can be easy.

(Modification 6 of the second embodiment)
Modification 6 of the second embodiment differs from the second embodiment shown in FIGS. 1 to 11 only in that the following functions are added to the control means 129B shown in FIG. That is, the CPU 77B of the control unit 129B performs the above-described table every time the plate cylinder 12 rotates after the printing by the same divided plate-making master 65 on the plate cylinder 12 is temporarily interrupted and before the printing is started again. -It also has a function to execute backside up / down movement correction.
In this modification, particularly when performing double-sided printing position correction (front / back side vertical movement correction) from continuous printing, printing is started when printing is continued using the same divided plate-making master 65 on the plate cylinder 12. The front / back surface top and bottom surfaces obtained by detecting and measuring the rear end position of the divided plate-making master 65 on the plate cylinder 12 using the master rear end sensor 153 during the previous idle rotation and calculating in the same manner as described above. Based on the movement correction value, the front / back side vertical movement correction is executed on the first sheet after printing is started. The second and subsequent sheets of paper are detected each time the plate cylinder 12 rotates and the printing position is corrected, so that the printing position does not shift. Accordingly, front / back vertical movement correction (print position correction) from continuous printing can be performed, and print position correction can be executed by utilizing the idle rotation of the plate cylinder. Of course, this modification can be applied to Modifications 3 to 5 of the second embodiment.

(Third embodiment)
16 and 21 show a third embodiment. Compared with the second embodiment shown in FIGS. 16 and 17, the third embodiment detects the master length of one plate wound around the plate cylinder 12 as shown in parentheses in FIG. 16. In other words, the divided plate-making master 65 on which a marking 154 (shown by a broken line in the drawing) is printed as a master roll, instead of the master rear end sensor 153, divided plate-making on the plate cylinder 12 is used. The main difference is that a marking position sensor 155 as a master display detecting means for detecting the position of the marking 154 of the completed master 65 is used, and a control means 129D is used instead of the control means 129B. Other configurations are the same as those of the stencil duplex printing apparatus 1 of the second embodiment.

The marking 154 is pre-printed on a master roll used in the stencil duplex printing apparatus 1, and the position thereof is maintained at an appropriate interval for each plate when wound around the outer peripheral surface of the plate cylinder 12, and the plate It is printed so as to be positioned at the upstream end of the cylinder 12 in the rotation direction (the rear end of the divided plate-making master 65). The marking 154 is printed in a stripe shape parallel to the width direction of the master, for example, in black that can be detected with high sensitivity in relation to the reflectance of light with respect to the thermoplastic resin film constituting the divided plate-making master 65.
The marking position sensor 155 is composed of, for example, a reflective photosensor. As shown in FIG. 16, up to the rear end of the opening in the rotational direction of the plate cylinder 12, the divided plate-making master 65 is attached to the outer peripheral surface of the plate cylinder 12 due to the adhesive force of the ink leached from the opening. The rear end portion 65Z of the divided plate-making master 65 positioned after the rear end of the opening of the plate cylinder 12 is not attached to the outer peripheral surface of the plate cylinder 12, and is lifted from the outer peripheral surface of the plate cylinder 12 and is free. Yes. The marking position sensor 155 passes through a sensor bracket (not shown) located in the vicinity of the position of the marking 154 of the divided plate-making master 65 in order to detect the position of the marking 154 on the rear end 65Y of the divided plate-making master 65 on the plate cylinder 12. It is attached and fixed to the device body.
The display for detecting the master length is not limited to the marking 154 printed as described above. For example, the display may be a rectangular shape or a triangle, or may be a display printed by an ink jet. Any display that can accurately and reliably detect the height is acceptable. The master display detection means is not limited to the marking position sensor 155, and any detection means can be used as long as it can accurately and surely detect the display position applied to the divided plate-making master 65. The arrangement position of the master display detection means is the same.

The master roll set on which the marking 154 for detecting the rear end 65Y of the divided plate-making master 65 is printed is set at the time of plate making when the marking position is set on the master holding member 16 shown in FIG. It is done so that it is located at the rear end. The leading end of the divided master-making master 65 may be set manually or may be set by automatically detecting the marking position. The divided plate-making master 65 on which the marking 154 for detecting the rear end 65Y of the divided plate-making master 65 is printed has the marking 154 printed according to the plate-making length.
When winding the divided plate-making master 65 around the plate cylinder 12, naturally, the plate is fed and wound so that the position of the marking 154 is the rear end 65 </ b> Y of the divided plate-making master 65. The marking position sensor 155 is arranged to detect and measure the length of the divided master plate 65 on the plate cylinder 12 by detecting the marking position of the split master plate 65 on the plate cylinder 12.

  As shown in FIG. 21, the control means 129D of this embodiment is mainly different from the control means 129B shown in FIG. 17 in that a CPU 130D instead of the CPU 130B is used and a ROM 131D instead of the ROM 131B is used. To do. The ROM 131D is different from the ROM 131B shown in FIG. 17 only in that a calculation program for performing an arithmetic function similar to the CPU 130B is stored in advance.

  The CPU 130D has a calculation function similar to that of the CPU 130B, that is, master length data relating to the position of the marking 154 of the divided plate-making master 65 on the plate cylinder 12 from the marking position sensor 155 during normal printing similar to the above. The front / rear top / bottom movement correction value is calculated from the master rear end position data signal, etc., and the top / bottom movement motor 259 is controlled so as to execute the surface top / bottom movement correction according to the calculated front / top / bottom movement correction value. The solenoid 33 is controlled so as to execute the backside up / down movement correction according to the calculated backside up / down movement correction value. The content calculated by the CPU 130D by calculating the front / back surface top / bottom movement correction value from the master rear end position data is the same as that of the CPU 130B.

Therefore, according to the third embodiment, the CPU 130D of the control unit 129D performs the master related to the rear end position of the marking 154 of the divided plate-making master 65 on the plate cylinder 12 from the marking position sensor 155 during normal printing. Calculates the master position deviation amount from the rear end position data, considers this as the front / back surface top / bottom movement correction value, and executes the top / bottom movement correction according to the calculated top / bottom top / bottom movement correction value. 259 and the solenoid 33 is controlled so as to execute the backside up / down movement correction according to the calculated backside up / down movement correction value. Therefore, even if the master position deviation occurs, the duplex printing position deviation is automatically performed. Because it is corrected, it is possible to obtain a double-sided printed product with no misalignment in double-sided printing, eliminating waste of masters and paper and shortening work time. , It is possible to reduce the man-hours.
Further, in the third embodiment, compared to the case where the rear end 65Y of the divided plate-making master 65 on the plate cylinder 12 is detected and measured as in the second embodiment, the divided plate-making master 65 on the plate cylinder 12 is used. Since the rear end position of the marking 154 is detected and measured, the accuracy is improved, and the accuracy of the front / back side vertical movement correction (print position correction) is improved accordingly.

(Modification 7 of the third embodiment)
As shown in FIG. 16, the marking rear end of the divided master-making master 65 on the plate cylinder 12 is not attached to the outer peripheral surface of the plate cylinder 12 and is lifted from the outer peripheral surface of the plate cylinder 12 and is in a free state. Therefore, it is difficult to accurately detect and measure the rear end position of the divided plate-making master 65 on the plate cylinder 12. Therefore, a modification 7 of the third embodiment was created.
FIG. 18 shows a seventh modification. As compared with the third embodiment shown in FIGS. 16 and 21, the modified example 7 is arranged such that the marking position sensor 155 is arranged at the nip portion between the plate cylinder 12 and the press roller 13 as shown in FIG. 18. The only difference is that the outer periphery of the plate cylinder 12 in the vicinity of the (nip portion) is changed.

As shown in FIG. 18, when printing pressure is applied by the press roller 13 during printing, the printing pressure range (pressing range) by the press roller 13 is set so that the printing pressure is applied to the rear end of the divided plate-making master 65. It is good to make the structure extended to the upstream of the rotation direction. Thereby, the rear end position of the marking 154 of the divided master plate 65 on the plate cylinder 12 becomes more stable than that of the third embodiment, and the nip portion between the plate cylinder 12 and the press roller 13 is more stable. By disposing the marking position sensor 155 in the vicinity, the position of the marking 154 of the divided master plate master 65 on the plate cylinder 12 can be accurately detected and measured.
Therefore, according to the modified example 7, the problem of the third embodiment can be solved, and the position of the marking 154 of the divided master-making master 65 on the plate cylinder 12 is more stable than that of the third embodiment. Since it is possible to accurately detect and measure and calculate, accurate front / back surface top and bottom movement correction can be executed.

(Modification 8 of the third embodiment)
In the above-described modified example 7, in order to accurately measure the position of the marking 154 of the divided plate-making master 65 on the plate cylinder 12, the marking position sensor 155 is connected to the plate cylinder 12, the press roller 13, as shown in FIG. When the printing roller 12 is arranged outside the outer peripheral surface of the plate cylinder 12 in the vicinity of the nip portion (clamping portion), when the press roller 13 rises and swings during printing to apply printing pressure, as shown in FIG. The printing pressure is applied up to the marking 154. However, the marking position sensor 155 is disposed at the nip portion where the plate cylinder 12 and the press roller 13 are in contact with each other before and after the nip position in layout (on the downstream side or the upstream side in the paper conveyance direction with the nip portion interposed). Therefore, it is difficult to accurately detect and measure the rear end position of the divided plate-making master 65 in consideration of paper conveyance. Therefore, Modification 8 of the third embodiment has been created in order to solve this problem.

FIG. 19 shows a modification 8 of the third embodiment. In the modified example 8, as compared with the modified example 7 shown in FIG. 18, the arrangement position of the marking position sensor 155 is changed to the nip portion between the plate cylinder 12 and the press roller 13 as shown in parentheses in FIG. 19. The divided master plate master 65 existing outside the outer peripheral surface of the plate cylinder 12 in the vicinity of the (clamping portion) and outside the plate cylinder width direction in the opening 12a of the plate cylinder 12, that is, in the non-opening portion 12b in the plate cylinder width direction The only difference is that the marking 154 is arranged to be detectable. As a result, the problem of the modified example 7 is solved, and the position of the marking 154 of the divided master-making master 65 on the plate cylinder 12 can be accurately detected and measured.
Therefore, according to the modified example 8, the problem of the modified example 7 can be solved, and the position of the marking rear end of the divided plate-making master 65 on the plate cylinder 12 is detected and measured more accurately than the modified example 7. Since it becomes possible to calculate, more accurate front / back surface top / bottom movement correction can be executed.

(Variation 9 of the third embodiment)
FIG. 22 shows a ninth modification of the third embodiment. As compared with the third embodiment shown in FIGS. 16 and 21, the modification 9 uses a signal related to the number of prints from the paper discharge sensor 150, and controls 129E instead of the control means 129D. The only difference is the use of.
As shown in FIG. 22, the control unit 129E of the present embodiment is mainly different from the control unit 129D shown in FIG. To do.

The ROM 131E is different from the ROM 131D shown in FIG. 21 only in that a calculation program for exhibiting a specific calculation function described later of the CPU 130E is stored in advance.
The CPU 130E replaces the CPU 130D shown in FIG. 21, that is, during regular printing similar to that described above, every time a signal related to the number of printed sheets from the paper discharge sensor 150 reaches a predetermined number of printed sheets. The front / back surface top / bottom movement correction value is calculated from the master rear end position data signal related to the rear end position of the marking 154 of the divided master plate master 65 on the plate cylinder 12 from the marking position sensor 155, and the calculated front surface The top / bottom movement motor 259 is controlled so as to execute the top / bottom movement correction according to the top / bottom movement correction value, and the solenoid 33 is controlled so as to execute the back / bottom movement correction according to the calculated back / bottom movement correction value. It has a function. The content calculated by the CPU 130E by calculating the front / back surface top / bottom movement correction value from the master rear end position data and the like is the same as that of the CPU 130D shown in FIG.

  Therefore, according to the ninth modification example, the CPU 130E of the control unit 129E causes each time a predetermined print number (for example, the same print number as shown in FIG. 11) to be set in FIG. Since the calculation similar to that of the CPU 130D shown is performed and the top / bottom movement motor 259 and the solenoid 33 are controlled so as to execute the front / back surface top / bottom movement correction according to the calculated front / back surface top / bottom movement correction value, FIG. It is not necessary to perform a front / back side top / bottom movement correction command according to the calculated front / back side top / bottom movement correction value by performing the same calculation for each printed sheet as the CPU 130D shown in FIG. Can be easy.

(Modification 10 of the third embodiment)
Modification 9 of the third embodiment differs from the third embodiment shown in FIGS. 16 and 21 only in that the following functions are added to the control means 129D shown in FIG. That is, the CPU 130D of the control unit 129D performs the above-described table every time the plate cylinder 12 rotates after the printing by the same divided plate-making master 65 on the plate cylinder 12 is temporarily interrupted and before the printing is started again. -It also has a function to execute backside up / down movement correction.
In this modification, particularly when performing double-sided printing position correction (front / back side vertical movement correction) from continuous printing, printing is started when printing is continued using the same divided plate-making master 65 on the plate cylinder 12. A table obtained by detecting and measuring the rear end position of the marking 154 of the master plate 65 on the plate cylinder 12 using the marking position sensor 155 during the previous idle rotation, and calculating in the same manner as described above. Based on the backside up / down movement correction value, the front / back side up / down movement correction is executed on the first sheet of paper after the start of printing. The second and subsequent sheets of paper are detected each time the plate cylinder 12 rotates and the printing position is corrected, so that the printing position does not shift. Therefore, it is possible to execute the correction of the printing position by utilizing the idle rotation of the plate cylinder, and it is also possible to correct the double-sided printing position from the continuous printing. Of course, this modification can be applied to Modifications 7 to 9 of the third embodiment.

  The configuration example is not limited to the third embodiment and the modifications 7 to 9, but may be as follows. That is, the position at which the marking 154 is printed on the divided master-making master 65 wound as a master roll is not limited to the position described above, and the position of the marking 154 may be moved in order to improve the detection / measurement accuracy of the master position deviation. A position that can be detected and measured within the range of the master position deviation, that is, for example, a position that is positioned at the upstream end of the plate cylinder 12 in the plate cylinder rotation direction when wound around the plate cylinder 12, in other words, the plate cylinder 12. You may make it the position closely_contact | adhered to the outer peripheral surface of a plate_cylinder | printing_drum with the ink leached in the rear edge part of the upper divided master-making master 65 above. Then, as described above, the marking position sensor 155 may be arranged at a position where the marking 154 of the divided plate-making master 65 in close contact with the plate cylinder 12 can be detected (even in the fourth embodiment described later and its modifications). The same).

(Fourth embodiment)
In the third embodiment described above and the modifications 7 to 10 thereof, the rear end of the divided plate-making master 65 is detected in advance in the master roll used to detect the length of the divided plate-making master 65 on the plate cylinder 12. Therefore, it is necessary to perform plate making so that the marking position is arranged at the rear end of the divided plate making master 65 during plate making using the divided plate making master 65 on which the marking 154 for printing is printed. For this reason, since it is necessary to set the tip of the divided master-making master 65 at a predetermined position in the master-making unit 3 at the start of the master-making, it must be set manually or automatically. In addition, the divided master-making master 65 is printed with a marking 154 for detecting the rear end of the master-made master 65 for each plate making wound around the plate cylinder 12. In the case where the feeding could not be performed, the divided master-making master 65 had to be cut for realignment. Therefore, a fourth embodiment has been created to solve this problem.

  A fourth embodiment is shown in FIGS. 16, 23, and 24. Compared with the third embodiment shown in FIGS. 16 and 21, the fourth embodiment replaces the plate making section 3 shown in FIG. FIG. 21 shows the use of a plate making unit 3F as a plate making apparatus provided with a marking printing device 156 as a display means for applying marking 154 (see FIG. 16), which is an example of a display for detecting the image, to the divided plate making master 65. The main difference is that a control means 129F is used instead of the control means 129D shown. Other configurations are the same as those of the stencil duplex printing apparatus 1 of the third embodiment. The plate making unit 3F is different from the plate making unit 3 shown in FIG. 1 only in that a marking printing device 156 is provided.

As shown in FIG. 23, the marking printing apparatus 156 is configured to include, for example, an ink jet head and the like, and, as in the example described in the third embodiment, the thermoplastic resin that constitutes the divided plate-making master 65 It is black that can be detected with high sensitivity in relation to the reflectance of light with respect to the film, and can be printed in a stripe shape parallel to the master width direction.
The marking printing device 156 includes a cutting unit so that marking printing can be performed at the rear end position of the divided plate-making master 65 at the position and timing immediately before the rear end of the divided plate-making master 65 is cut by the cutting unit 60 at the end of plate making. It is arranged on the master conveyance path between 60 and the tension roller pair 62.

  As shown in FIG. 24, the control means 129F of this embodiment is mainly different from the control means 129D shown in FIG. 21 in that a CPU 130F instead of the CPU 130D is used and a ROM 131F instead of the ROM 131D is used. To do. Compared to the ROM 131D shown in FIG. 21, the ROM 131F is located at the rear end position of the divided master-making master 65 at the position and timing immediately before the rear end of the split master-making master 65 is cut by the cutting means 60 at the end of plate making. The only difference is that an operation program for controlling the driving means of the marking printing apparatus 156 so as to perform marking printing and a calculation program for exhibiting an arithmetic function similar to the CPU 130D are stored in advance.

  The CPU 130F reads the operation program stored in the ROM 131F, and marks the rear end position of the divided master-making master 65 at the position / timing immediately before the rear end of the split master-making master 65 is cut by the cutting means 60 at the end of plate making. In addition to the function of controlling the driving means of the marking printing device 156 to perform printing, the above calculation function similar to the CPU 130D, that is, on the plate cylinder 12 from the marking position sensor 155 during regular printing similar to the above. The front / back surface top / bottom movement correction value is calculated from the master rear end position data signal or the like as the master length data relating to the position of the marking 154 of the divided master-making master 65, and the front / top / bottom movement correction value is calculated. The top / bottom movement motor 259 is controlled so as to execute the surface top / bottom movement correction. Has the function of controlling the solenoid 33 to perform the back surface vertical movement correction in accordance with the backside top-bottom shift correction value calculated. The contents calculated by the CPU 130F by calculating the front / back surface top / bottom movement correction value from the master rear end position data and the like are the same as those of the CPU 130B and CPU 130D.

  Therefore, according to the fourth embodiment, the CPU 130D of the control unit 129D performs the master related to the rear end position of the marking 154 of the divided plate-making master 65 on the plate cylinder 12 from the marking position sensor 155 during normal printing. The master position deviation amount is calculated from the rear end position data by calculation, and this is regarded as the front / back side vertical movement correction value, and the front / back side vertical movement correction corresponding to the calculated front / back side vertical movement correction value is executed. Since the vertical movement motor 259 and the solenoid 33 are controlled at the same time, even if the master position deviation occurs, the double-sided printing position deviation is automatically corrected. In addition, wasteful paper and paper can be eliminated, work time can be shortened, and man-hours can be reduced. In the fourth embodiment, the above-mentioned problems of the third embodiment are solved, the operability of the master set is improved, and troublesome work such as master cutting can be eliminated. Compared to the case where the rear end 65Y of the divided plate-making master 65 on the plate cylinder 12 is detected and measured as in the embodiment, the rear end position of the marking 154 of the divided plate-making master 65 on the plate cylinder 12 is detected and measured. Therefore, the accuracy is improved and the accuracy of the double-sided printing position correction is improved accordingly.

  In the fourth embodiment, the fourth embodiment is similar to the seventh modification of the third embodiment described with reference to FIG. 18 and the eighth modification of the third embodiment described with reference to FIG. It goes without saying that the same effects can be obtained by configuring as modification examples 11 and 12 of the embodiment. Since modifications 11 and 12 of the fourth embodiment can be easily understood and implemented by those skilled in the art, further description thereof is omitted.

(Modification 13 of the fourth embodiment)
FIG. 19 shows a modification 13 of the fourth embodiment. As compared with the fourth embodiment shown in FIGS. 16 and 24, the modified example 13 uses a signal relating to the number of prints from the paper discharge sensor 150, and controls 129G instead of the control means 129F. The only difference is the use of.
As shown in FIG. 25, the control unit 129G of the present embodiment is mainly different from the control unit 129F shown in FIG. To do.

Compared with the ROM 131F shown in FIG. 24, the ROM 131G stores in advance a calculation program for exhibiting a specific calculation function described later of the CPU 130G, that is, a program similar to the partial calculation program of the ROM 131E shown in FIG. The only difference is that
The CPU 130G replaces the CPU 130F shown in FIG. 24, that is, during regular printing similar to that described above, every time a signal related to the number of printed sheets from the paper discharge sensor 150 reaches a predetermined number of printed sheets. The front / back surface top / bottom movement correction value is calculated from the master rear end position data signal related to the rear end position of the marking 154 of the divided master plate 65 on the plate cylinder 12 from the marking position sensor 155, and is calculated. The top and bottom movement motor 259 is controlled so as to execute the front and top movement correction according to the front and top movement correction value, and the solenoid 33 is controlled so as to execute the back and top movement correction according to the calculated back and top movement correction value. It has the function to do. The content calculated by the CPU 130G by calculating the front / back surface top / bottom movement correction value from the master rear end position data or the like is the same as that of the CPU 130E.

Therefore, according to the thirteenth modification, the CPU 130G of the control unit 129G causes the CPU 130E described above every time when a predetermined number of printed sheets (for example, the same number of printed sheets as shown in FIG. 11) is reached during regular printing. 24, the top / bottom movement motor 259 and the solenoid 33 may be controlled so as to execute front / back surface top / bottom movement correction in accordance with the calculated front / back surface top / bottom movement correction value. Like the CPU 130F, it is not necessary to perform the same calculation as described above for each printed sheet, and to issue a front / back surface top / bottom movement correction command according to the calculated front / back surface top / bottom movement correction value. it can.
Also in the fourth embodiment, the same function as the control unit 129D of the third embodiment shown in FIG. 21, that is, the CPU 77G of the control unit 129G performs printing by the same divided plate-making master 65 on the plate cylinder 12. Has a function of executing the above-described front / back surface top / bottom movement correction every time the plate cylinder 12 rotates before the printing is resumed after the suspension of the printing (variation example of the fourth embodiment) 14). In this modified example 14, particularly when performing double-sided printing position correction (front / back side vertical movement correction) from continuous printing, printing using the same divided plate-making master 65 on the plate cylinder 12 is continued. A table obtained by detecting and measuring the rear end position of the marking 154 of the divided master plate master 65 on the plate cylinder 12 using the marking position sensor 155 during idling before starting, and calculating in the same manner as described above. -The front / back side top / bottom movement correction is executed on the first sheet after printing based on the back side / top / bottom movement correction value. The second and subsequent sheets of paper are detected each time the plate cylinder 12 rotates and the printing position is corrected, so that the printing position does not shift. Therefore, it is possible to execute the correction of the printing position by utilizing the idle rotation of the plate cylinder, and it is also possible to correct the double-sided printing position from the continuous printing. It goes without saying that this modification can also be applied to the modifications 11 to 13 of the fourth embodiment.

As the displacement driving means for displacing the re-feeding registration roller 23 as the pressure contact means so as to occupy the pressure contact position, in addition to the solenoid 33, for example, a DC motor or a stepping motor is used via a gear train or the like. It goes without saying that it can also be done.
Although partly described above, the surface top / bottom moving means for changing the feeding timing of the registration roller pair 71 is not limited to the surface top / bottom moving means 250, but a re-feed resist in the paper re-feed means 9 by a registration roller formed of a stepping motor, for example. It is also possible to execute the rotation of the plate cylinder 12 together with the solenoid 33 of the roller contact / separation mechanism 160 (back surface up / down moving means) without stopping.

  From the contents described above, the feeding timing of the registration roller pair 71 is automatically determined according to the contents of the first to fourth and the modified examples described above even during single-sided printing using the master-making master 66 for single-sided printing. It goes without saying that by executing the upside-down movement correction, the printing position deviation can be automatically corrected even if the master position deviation occurs, and the same effect as described above can be obtained.

  As described above, the present invention has been described with reference to specific embodiments and modifications. However, the technical scope disclosed by the present invention is limited to those exemplified in the above-described embodiments or modifications. However, those skilled in the art can configure various embodiments, examples, and modifications according to the necessity and application within the scope of the present invention. it is obvious.

The double-sided printing method and double-sided printing apparatus of the present invention can also be applied to stencil double-sided printing apparatuses such as Japanese Patent No. 3545861 and Japanese Patent Application Laid-Open No. 2005-153179. For example, in the stencil printing apparatus described in Japanese Patent No. 3545861, means / structure for changing the feeding timing of the resist rollers (37) shown in FIGS. As long as it functions as Further, in the double-sided printing apparatus described in Japanese Patent Application Laid-Open No. 2005-153179, the registration motor (41) that rotationally drives the registration roller pair (31) shown in FIG. 1, FIG. 2, FIG. The operation timing of the conveyor belt (108) in the refeed unit (45) shown in FIGS. 1, 2 and 17, etc. of the publication is made to function as surface top and bottom moving means by changing the rotation drive start timing. That is, it is sufficient to function as the back and top moving means by changing the operation timing of the belt drive motor (105) for driving the conveyor belt (108).
Further, the double-sided printing method and double-sided printing apparatus of the present invention can be applied to or applied mutatis mutandis to, for example, an offset printer.

1 is a simplified front view of an entire stencil duplex printing apparatus showing a first embodiment of the present invention. FIG. 2 is a schematic front view illustrating a re-feeding unit, a press roller contacting / separating mechanism, and a press roller separated from an outer peripheral surface of a plate cylinder used in the first embodiment. FIG. 3 is a schematic plan view illustrating a refeed conveyance unit and a sheet receiving plate used in the first embodiment. It is a schematic side view explaining the press roller contact / separation mechanism used for 1st Embodiment. FIG. 2 is a schematic front view illustrating a re-feeding unit, a press roller contact / separation mechanism, and a press roller in contact with an outer peripheral surface of a plate cylinder used in the first embodiment. It is a schematic plan view explaining the divided plate-making completed master used for 1st Embodiment. It is a schematic plan view explaining the pre-printed master used in the first embodiment. It is a front view of the principal part of the surface top and bottom moving means used by 1st Embodiment etc. It is the schematic which shows the operation panel used for 1st Embodiment etc. It is a block diagram which shows the control structure of 1st Embodiment. (A) shows a data table of surface top and bottom movement correction values set for each predetermined number of printed sheets, and a case where a surface top and bottom movement correction value corresponding to a specific number of printed sheets within a predetermined number of printed sheets is obtained by calculation. Explanatory drawing (b) is a data table of backside upright movement correction values, and is an explanatory view when a backside upside movement correction value corresponding to a specific number of printed sheets within a predetermined print number range is obtained by calculation. It is a block diagram which shows the control structure of the modification 2 of 1st Embodiment. It is a graph explaining the kind of printing conditions as a parameter. It is a graph explaining the pattern selected by the combination of the printing conditions as a parameter. It is a figure which shows the data table of the front and back surface top and bottom movement correction value set according to the pattern for every print number. In 2nd thru | or 4th Embodiment, it is a schematic front view which shows the example of arrangement | positioning of the master rear end sensor and marking position sensor which detect the rear end position and rear end display position of the master on a plate cylinder. It is a block diagram which shows the control structure of 2nd Embodiment. In each modification of 2nd thru | or 4th embodiment, the rough front which shows the other example of arrangement | positioning of the master rear end sensor and marking position sensor which detect the rear end position and rear end display position of the master on a plate cylinder FIG. In each modification of 2nd thru | or 4th Embodiment, it is a figure which shows another example of arrangement | positioning of the master rear end sensor which detects the rear end position of a master on a plate cylinder, and a rear end display position, and a marking position sensor. FIG. 6 is a schematic side view as seen from the paper discharge tray side. It is a block diagram which shows the control structure of the modification 5 of 2nd Embodiment. It is a block diagram which shows the control structure of 3rd Embodiment. It is a block diagram which shows the control structure of the modification 9 of 3rd Embodiment. It is a front view of the principal part which shows the structure of the plate-making part of 4th Embodiment. It is a block diagram which shows the control structure of 4th Embodiment. It is a block diagram which shows the control structure of the modification 13 of 4th Embodiment. (A) is a cross-sectional view of the main part explaining the situation of the master misalignment that occurs in the master on the plate cylinder, and (b) explains the state where the master misalignment is absorbed and the master is in close contact with the plate cylinder. It is sectional drawing of the principal part to do.

Explanation of symbols

1 Stencil duplex printing device (duplex printing device)
2 Printing section 3, 3F Plate making section (plate making equipment)
12 Plate Cylinder 12a Plate Cylinder Opening 12b Plate Cylinder Non-Opening 13 Press Roller (Pressing Means)
15 Ink supply means 19b Clamper (holding means)
23 Re-feeding registration roller 24 Re-feed positioning member 33 Solenoid (rear side up / down movement means, back side up / down movement driving means)
59 Thermal head (plate making means)
65 divided master-making master 65A first master-making image (first master-making image)
65B Second plate making image (second plate making image)
65Y Rear end of master on plate cylinder 71 Registration roller pair 103 Operation panel 121 Plate cylinder driving means 129, 129A to 129G Control means 130, 130A to 130G CPU (constitutes control means)
131, 131A to 131G ROM (storage means)
132 RAM
133 Timer 135 Home position sensor 150 Paper discharge sensor (number of printed sheets counting means)
152 Plate cylinder rotation angle sensor 153 Master rear end sensor (master rear end detection means)
154 Marking (display)
155 Marking position sensor (master display detection means)
156 Marking printing device (display means)
250 Surface top and bottom movement means 259 Top and bottom movement motor (surface top and bottom movement drive means)
P paper (printing media)
PA surface printed paper PB printed paper

Claims (21)

A plate cylinder around which a divided plate-making master formed by arranging two first plate-making images and a second plate-making image along the rotation direction is wound, and the first of the divided plate-making masters on the plate cylinder Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the plate-making image and the second plate-making image to the surface of the print medium in the transport direction of the print medium, and divided plate-making on the plate cylinder Double-sided printing having backside up and down moving means for moving the position of a backside printed image transferred from either one of the first platemaking image and the second platemaking image to the back side of the printing medium in the master in the transport direction of the printing medium In the double-sided printing method using the device,
A front-to-top movement correction value and a back-to-top movement correction value are set in advance according to parameters including the number of printed sheets that affect the positional deviation of the divided plate-making master in the rotation direction of the plate cylinder, Based on the above, during the printing, the surface top and bottom moving means is automatically executed to perform the surface top and bottom movement correction, and based on the back side top and bottom movement correction value, during the printing, the back and top and bottom moving means are automatically executed. A double-sided printing method characterized by causing the backside upright movement correction to be executed. A plate cylinder around which a divided plate-making master formed by arranging two first plate-making images and a second plate-making image along the rotation direction is wound, and the first of the divided plate-making masters on the plate cylinder Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the plate-making image and the second plate-making image to the surface of the print medium in the transport direction of the print medium, and divided plate-making on the plate cylinder Double-sided printing having backside up and down moving means for moving the position of a backside printed image transferred from either one of the first platemaking image and the second platemaking image to the back side of the printing medium in the master in the transport direction of the printing medium In the device
A printed sheet counting means for counting the number of printed sheets;
Storage means for storing front and back top and bottom movement correction values preset for each predetermined number of printed sheets;
Each time the number of printed sheets counted by the number-of-printed-sheet counting means reaches the predetermined number of printed sheets, the front-to-back movement correction value and the back-to-back movement correction value corresponding to the predetermined printing number are read from the storage unit, During printing, the surface top / bottom movement correction is executed according to the surface top / bottom movement correction value read by the surface top / bottom movement means, and the back surface top / bottom movement read by the back surface top / bottom movement means. Control means for executing backside up / down movement correction according to the correction value;
A double-sided printing apparatus comprising: The double-sided printing apparatus according to claim 2,
Each time the control means counts the number of printed sheets as the number of printed sheets within the predetermined printed number range by the printed number counting means, the surface top and bottom corresponding to the predetermined number of printed sheets is stored from the storage means. The surface top and bottom movement correction corresponding to the number of prints per sheet from the movement correction value and the back side top and bottom movement correction value and the surface top and bottom movement correction value and the back side top and bottom movement correction value corresponding to the next predetermined number of prints. And calculating the surface top and bottom movement correction value according to the surface top and bottom movement correction value calculated by the surface top and bottom movement means. The double-sided printing apparatus is configured to execute the backside up / down movement correction according to the calculated backside up / down movement correction value. The double-sided printing apparatus according to claim 2,
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each type of master. The double-sided printing apparatus according to claim 2,
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each type of the plate cylinder. The double-sided printing apparatus according to claim 2,
Having ink supply means for supplying ink to the divided pre-printed master on the plate cylinder;
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each ink color used in the plate cylinder. The double-sided printing apparatus according to claim 2,
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each printing speed. The double-sided printing apparatus according to claim 2,
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each type of print medium. The double-sided printing apparatus according to claim 2,
Having ink supply means for supplying ink to the master made on the plate cylinder,
The double-sided printing apparatus, wherein the top-and-bottom movement correction value and the back-and-bottom movement correction value have adjustment values for each ink temperature setting range. The double-sided printing apparatus according to any one of claims 2 to 9,
A double-sided printing apparatus comprising switching means for switching whether or not the front-and-back movement correction and the back-and-back movement correction by the control means are necessary. A plate cylinder around which a divided plate-making master formed by arranging two first plate-making images and a second plate-making image along the rotation direction is wound, and the first of the divided plate-making masters on the plate cylinder Surface top-and-bottom moving means for moving the position of the surface print image transferred from one of the plate-making image and the second plate-making image to the surface of the print medium in the transport direction of the print medium, and divided plate-making on the plate cylinder Double-sided printing having backside up and down moving means for moving the position of a backside printed image transferred from either one of the first platemaking image and the second platemaking image to the back side of the printing medium in the master in the transport direction of the printing medium In the device
Master rear end detection means for detecting the rear end position of the divided plate-making master on the plate cylinder,
The surface calculated by calculating the surface top and bottom movement correction value and the back surface top and bottom movement correction value from the master rear end position data detected by the master rear end detection means, and calculating the surface top and bottom movement means during printing. Control means for performing front-to-top movement correction according to the top-and-bottom movement correction value, and executing back-surface top-to-bottom movement correction according to the back-and-top movement correction value calculated by the back-and-back movement means;
A double-sided printing apparatus comprising: The double-sided printing apparatus according to claim 11.
A pressing means for pressing the printing medium to the divided pre-printed master on the plate cylinder;
The double-sided printing apparatus, wherein the master trailing edge detecting means is arranged in the vicinity of a clamping portion between the plate cylinder and the pressing means. The double-sided printing apparatus according to claim 12,
The plate cylinder is provided with an ink-permeable opening,
The double-sided printing apparatus, wherein the master trailing edge detection means is disposed outside the opening in the plate cylinder width direction. The double-sided printing apparatus according to any one of claims 11 to 13,
A printed sheet counting means for counting the number of printed sheets;
The control means corrects the surface top / bottom movement from the master trailing edge position data detected by the master trailing edge detection means each time the number of printed sheets counted by the printing number counting means reaches a predetermined number of preset printing sheets. Value and back surface top movement correction value are calculated, and during printing, the front surface top surface movement correction is performed according to the front surface top surface movement correction value calculated by the front surface top surface movement means, and the back surface top surface movement is performed. A double-sided printing apparatus that performs backside upside movement correction according to the backside upside movement correction value calculated by the means . The double-sided printing apparatus according to any one of claims 11 to 14,
The control means causes the front-to-back movement correction and the back-to-back movement correction to be executed for each rotation of the plate cylinder after printing is temporarily interrupted and before printing is started again. Printing device. A master with a display for detecting the master length is used, and a divided pre-made master in which two first and second pre-made images are arranged side by side in the rotation direction is wound. The position of the surface printing image transferred from one of the first plate making image and the second plate making image on the plate cylinder and the divided plate making master on the plate cylinder to the surface of the printing medium is the transport direction of the printing medium And a position of the back surface printed image transferred from either one of the first plate making image and the second plate making image in the divided plate making master on the plate cylinder to the back surface of the printing medium. A reverse side top and bottom moving means that moves in the conveyance direction of the print medium, and the display is arranged upstream in the rotation direction of the plate cylinder when the divided plate-making master is wound around the plate cylinder. A double-sided printing device installed in
Master display detection means for detecting the display of the divided master-making master on the plate cylinder;
The surface top-and-bottom movement correction value and the back-and-bottom top and bottom movement correction value are calculated from the master length data detected by the master display detection means, and the surface top and bottom movement calculated by the surface top and bottom movement means during printing. Control means for performing front-and-back movement correction according to the correction value, and executing back-side movement correction according to the back-and-back movement correction value calculated by the back-and-back movement means;
A double-sided printing apparatus comprising: The double-sided printing apparatus according to claim 16, wherein
A pressing means for pressing the printing medium to the divided pre-printed master on the plate cylinder;
A double-sided printing apparatus, wherein the master display detection means is arranged in the vicinity of a clamping part between the plate cylinder and the pressing means. The double-sided printing apparatus according to claim 17,
The plate cylinder is provided with an ink-permeable opening,
The double-sided printing apparatus, wherein the master display detection means is disposed outside the opening in the plate cylinder width direction. The double-sided printing apparatus according to any one of claims 16 to 18,
A printed sheet counting means for counting the number of printed sheets;
The control means calculates the surface top / bottom movement correction value from the master length data detected by the master display detecting means and the print number counted by the print number counting means reaches a predetermined print number set in advance. A back-and-top movement correction value is calculated by calculation, and during printing, the front-and-back movement control is performed according to the front-and-top movement correction value calculated by the front-and-back movement means, and A double-sided printing apparatus that performs back-and-back top-and-bottom movement correction according to the calculated back-and-back top-and-bottom movement correction value . The double-sided printing apparatus according to any one of claims 16 to 19,
The control means causes the front-to-back movement correction and the back-to-back movement correction to be executed for each rotation of the plate cylinder after printing is temporarily interrupted and before printing is started again. Printing device. A plate making apparatus comprising plate making means for making a master and a display means for giving a display for detecting the master length to the master, a first plate making image and a second plate made by the plate making means along the rotation direction. And a plate cylinder on which the divided plate-making master formed on two sides of the plate-making image is wound, and either the first plate-making image or the second plate-making image in the divided plate-making master on the plate cylinder Surface top and bottom moving means for moving the position of the surface print image transferred to the surface of the print medium in the transport direction of the print medium, and the first plate making image and the second plate making image in the divided plate making master on the plate cylinder And a backside up and down moving means for moving the position of the backside printed image transferred from the other side to the backside of the printing medium in the transport direction of the printing medium, and the divided plate-making master is wound around the plate cylinder. When A double-sided printing apparatus which is mounted so that the display has been performed by the shown means is disposed on the upstream side in the rotational direction of the plate cylinder,
Master display detection means for detecting the display of the divided master-making master on the plate cylinder;
The surface top-and-bottom movement correction value and the back-and-bottom top and bottom movement correction value are calculated from the master length data detected by the master display detection means, and the surface top and bottom movement calculated by the surface top and bottom movement means during printing. Control means for performing front-and-back movement correction according to the correction value, and executing back-side movement correction according to the back-and-back movement correction value calculated by the back-and-back movement means;
A double-sided printing apparatus comprising:

Images