JPH09327967A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make base sheets of respective plate cylinders by one platemaking means by controlling a printing plate or stencil for front surface printing so that original data becomes an inverted image at the time of selecting the plate and controlling a printing plate for rear surface printing so that the original data becomes a normal image at the time of selecting the plate for the rear surface printing. SOLUTION: A front or rear designation switch 195 for selecting whether data read by an original reading means 7 is printed on front or rear surface of a print sheet 53 is provided. At the time of selecting a printing plate for front surface printing by the switch 195, the plate is made by a platemaking means at a lower position of the means 7 so that original data read by the means 7 becomes an inverted image. At the time of selecting a printing plate for rear surface printing, the plate is made by the platemaking means so that the original data read by the means 7 becomes a normal image. Thus, the plates can be made of base sheets of respective plate cylinders by the one platemaking means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly, to one stencil making means for making a stencil for a front side and a back side of a printing sheet and printing on both sides. Regarding things that have been devised so.

[0002]

2. Description of the Related Art Heretofore, there has been a stencil printing apparatus that performs printing on printing paper using a plate cylinder around which a stencil sheet having been made is wound. The stencil printing machine has an advantage that the operation is so simple that it can be used in a general office and can be used with the same feeling as a so-called "copier". Therefore, the configuration of the conventional stencil printing machine will be described with reference to FIG. First,
Document reading means 301 is provided.
Is configured as a book-type image scanner unit.
03, and the original is fixed by the cover 305. Then, an image scanner (not shown) is operated to read data shown on the document as print data.

At a position below the original reading means 301,
Plate making means 307 is provided. That is, first, there is a base paper roller 309, and a stencil base paper (hereinafter abbreviated as base paper) 311 is wound around the base paper roller 309.
On the left side of the base paper roller 309 in FIG. 11, a line thermal head 313 and a platen roller 315 are arranged to face each other. Further, a stencil paper cutter 317 and stencil paper feed rollers 319 and 321 are opposed and arranged.
A plate cylinder 323 is arranged, and a plate discharge means 325 is installed on the left side of FIG. A plate discharge box 327 is provided in the plate discharge means 325, and plate discharge rollers 329 and 331 are opposed to and arranged at the entrance of the plate discharge box 327.

In the plate making means 307 having the above structure, the line thermal head 31 based on the print data read by the document reading means 301 described above.
3, a plurality of point heating elements selectively generate heat,
As a result, the base paper 3 supplied from the base paper roller 309
11 is subjected to perforation and plate making. That is, the base paper 311 has, for example, a configuration in which a PET film is attached to one surface side of a nonwoven fabric, and the portion of the PET film is melted and perforated by the heat generated by the point heating element,
Plate making is performed.

The perforated and perforated stencil 311 is supplied to a platen roller 315 and stencil stencil feed rollers 319 and 321.
As a result, the sheet is conveyed in the direction of the plate cylinder 323, and its tip is clamped by a clamp mechanism 333 provided on the plate cylinder 323. When the plate cylinder 323 rotates, the base paper 311 is wound around the outer peripheral surface of the plate cylinder 323. Then, the base paper 311 is cut by the base paper cutter 317 at a predetermined length.

On the other hand, there is a sheet feeding means 335, and the sheet feeding means 335 has a sheet feeding table 337.
7, a plurality of printing papers 339 are placed in a stacked state. A pickup roller 341 and a sub roller 343 are disposed above the printing paper 339 and on the side of the plate cylinder 323. A pad 345 for sabaki is arranged below the sabaki roller 343. The registration rollers 347 and 349 are opposed to and arranged on the plate cylinder 323 side of the sub-roller roller 345. The paper feed table 337 is configured to be able to move up and down by a drive motor and a sensor (not shown) so that the uppermost printing paper 339 is always in contact with the pickup roller 341. Then, when supplying the printing paper 339, first, the pickup roller 341 and the sabaki roller 343 are rotated by a drive motor (not shown) to send out the top printing paper 339. At this time, if two or more printing papers 339 are multiply fed, the multiply fed printing papers 339 are separated by the sabaki roller 343 and the sabaki pad 345. A printing unit 351 is provided in the plate cylinder 323, and another cylinder 353 is disposed below the plate cylinder 323 in FIG. On the discharge side of the printing paper 339, a paper discharge means 355 and a paper discharge stocker 357 are provided.

According to the above configuration, the data reading means 301
The print data is read by the
Transfer to. The plate making means 307 performs perforation and plate making on the base paper 311 based on the transferred print data. The perforated and perforated base paper 311 is wound around a plate cylinder 323. On the other hand, the printing paper 339 is supplied from the paper feeding means 335 to the plate cylinder 323.
The paper is supplied by the printing unit 351 while the paper is passed therethrough, and is discharged into the discharge stocker 357 by the discharge unit 355.

[0008]

The above-mentioned conventional structure has the following problems. Recently, from the viewpoint of effective use of resources, in printing, it is required to perform printing not only on the front surface but also on the back surface. However, in the above-described conventional stencil printing apparatus, when printing is performed on both the front surface and the back surface of the printing paper 339, an operation of inverting the printing paper 339 is required as an operation. In other words, it is necessary to turn the printing paper 339 once printed on the front side upside down and set it on the paper feeding means 335 again, and there is a problem that a complicated operation is inevitable. To solve such a problem, an apparatus for printing on both sides of printing paper by using two plate cylinders has been proposed. However, by providing a plate making means on each plate cylinder, it is possible to increase the cost and size of the apparatus. There was a problem with. Furthermore, although the applicant of the present application has proposed a stencil printing apparatus that enables high-quality double-sided printing by using two plate cylinders and one transfer cylinder, it is also not preferable to provide two plate making means. It is a thing.

The present invention has been made on the basis of the above points, and an object of the present invention is to print the front surface of a printing paper by a plate cylinder and to print the ink image from another plate cylinder on the back surface of the printing cylinder. An object of the present invention is to provide a stencil printing apparatus capable of transferring and performing printing by the transfer cylinder, which is capable of making the base paper of each plate cylinder by using one plate making means.

[0010]

In order to achieve the above object, a stencil printing apparatus according to the present invention comprises a document reading unit for reading document data from a document, and a perforation on a base sheet based on the document data read by the document reading unit. .A plate making means for making a plate, a first plate cylinder around which a base paper for front side printing is wound, a second plate cylinder around which a base paper for back side printing is wound, and an ink image of this second plate cylinder is transferred A transfer cylinder, a printing means for printing on the front surface of the printing paper by the first plate cylinder and a back surface for printing by the transfer cylinder, and a selection means for selecting a plate making for front surface printing or a plate making for back surface printing. In the stencil printing apparatus including, when the plate making for surface printing is selected by the selecting unit, the plate making by the plate making unit is controlled to be an inverted image with respect to the document data read by the document reading unit. A control means for controlling the plate making by the plate making means to be a normal image with respect to the document data read by the document reading means when the plate making for back side printing is selected by the selecting means. To do.

[0011]

In the case of the present invention, the first plate cylinder and the second plate cylinder are provided, and the transfer cylinder is provided so as to correspond to the second plate cylinder. Then, the ink image is transferred from the second plate cylinder to the transfer cylinder. In the stencil printing machine having such a configuration,
If the front and back sides are simply selected by the selecting means, one plate-making means automatically performs punching and plate-making on the base paper for front side printing or the base paper for back side printing. That is, when the plate making for front side printing is selected by the selecting means, the control means controls the plate making by the plate making means to be a reverse image with respect to the original data read by the original reading means, and the back side printing is made by the selecting means. When the plate making is selected, the control means controls the plate making by the plate making means to be a normal image with respect to the document data read by the document reading means.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a view showing the outer appearance of a stencil printing machine according to this embodiment, and the internal structure thereof is shown schematically in FIG. The stencil printing machine according to the present embodiment basically has two plate cylinders 1 and 3 (the first plate cylinder 1 and the second plate cylinder 3), and between these two plate cylinders 1 and 3. A transfer cylinder 5 is provided, and around these two plate cylinders 1 and 3 and the transfer cylinder 5, a document reading means 7, a plate making means 9, plate discharging means 11 and 13, a paper feeding means 1 are provided.
5, printing means 17, 19, paper discharging means 21, cleaning means 22, etc. are arranged. The plate cylinders 1, 3 and the transfer cylinder 5 all have the same outer diameter.

The configuration of each section will be described in detail below. First, the document reading means 7 is configured as a book type image scanner unit, and a document to be printed is placed at a predetermined position on the document setting surface 23. And the original is fixed by the cover 25. Then, the image scanner (shown as the line sensor 26 in FIG. 10) is operated to read the data shown in the document. Alternatively, in the case of a sheet-shaped document, the sheet-shaped document is placed on the document tray 24, conveyed to a predetermined position on the document set surface 23 by a conveying means (not shown), set, and data is read in the same manner as described above. Go. FIG.
As shown in FIG. 0, the front side printing original 28 ′ is used as the original.
And the backside printing original 28 ″.

Below the original reading means 1, the above-described plate making means 9 is arranged. That is, first, there is a base paper roller 27, and the base paper roller 27
Is wound. A line thermal head 31 and a platen roller 35 are opposed to and arranged on the left side of the base paper roller 27 in FIG. Furthermore, the stencil paper cutter 37,
The stencil paper feed rollers 39 and 41 are opposed and arranged. On the left side of FIG. 2 with respect to the plate cylinder 1, the above-described plate discharging means 11 is installed.
Has a plate discharge box 43, and plate discharge rollers 45 and 47 are opposed to and arranged at the entrance of the plate discharge box 43. The line thermal head 31 is connected to the line sensor 26 via a signal cable 32, as shown in FIG.

In the plate making means 9 having the above structure, a plurality of point heating elements provided in the line thermal head 31 selectively generate heat based on the print data read by the document reading means 7 already described. As a result, the base paper 29 supplied from the base paper roller 27 is perforated and plate-formed. That is, the base paper 29 has, for example, a configuration in which a PET film is adhered to one surface side of a nonwoven fabric, and a portion of the PET film is melted and perforated by the heat generated by the point heating element, thereby forming a plate. Is what is done. Note that, in FIG. 10, the base paper for front side printing is indicated by 29 'and the base paper for back side printing is indicated by 29 ".

The perforated and perforated stencil 29 is conveyed in the direction of the plate cylinder 1 by a platen roller 35 and stencil feed rollers 39 and 41, and the leading end thereof is clamped by a clamp mechanism 49 provided on the plate cylinder 1. Is done. Then, as the plate cylinder 1 rotates, the base paper 29 is wound around the outer peripheral surface of the plate cylinder 1. Then, the sheet is cut by the base paper cutter 37 at a predetermined length. Since the plate discharging means 13 has the same configuration as the plate discharging means 11, the same reference numerals are given to the same parts in the figure, and the description thereof will be omitted.

Next, the configuration of the sheet feeding means 15 will be described. First, there is a paper feed table 51, and on this paper feed table 51,
A plurality of printing papers 53 are placed in a stacked state. Further, a pickup roller 55 and a sabaki roller 57 are disposed above the printing paper 53 and on the transfer cylinder 5 side. Below the separation roller 57, a separation pad 59 is arranged. Sabaki Roller 57
The registration rollers 61 and 63 are opposed to the transfer cylinder 5 side.
Are located. The paper feed table 51 is configured to be able to move up and down by a drive motor and a sensor (not shown) so that the uppermost printing paper 53 is always in contact with the pickup roller 55.

When supplying the printing paper 53, first, the pickup roller 55 and the sabaki roller 57
Are rotated by a drive motor (not shown) to feed out the uppermost printing paper 53. At that time, if two or more printing papers 53 are fed in a double feed, the separation roller 57
And the printing paper 5 double fed by the pad 59 for Sabaki
3 is separated. That is, it is set so that only one sheet of printing paper 53 can pass between the sabaki roller 57 and the sabaki pad 59. Therefore, the registration roller 6
Only one sheet of printing paper 53 is supplied to the sides 1 and 63. Then, the leading end of the supplied printing paper 53 is
When reaching the contact position between the registration rollers 61 and 63, the rotation of the pickup roller 55 and the rotation roller 57 is temporarily stopped to enter a standby state. Then, when the paper feed timing is reached in accordance with the rotation timing of the plate cylinders 1 and 3 and the transfer cylinder 5 side, the registration rollers 61 and 63 are rotated by a drive motor (not shown), and the printing paper 53 is printed. It is supplied between the cylinder 1 and the transfer cylinder 5.

Here, the rotational driving of the plate cylinders 1 and 3 and the transfer cylinder 5 will be described. First, as shown in FIG. 3, a driving motor 65 is provided, and a pulley 67 is fixed to a rotating shaft of the driving motor 65. Have been. On the other hand, a pulley 69 is coaxially fixed to the transfer drum 5 side, and a belt 71 is wound around the pulley 69 and the pulley 67. Accordingly, when the drive motor 65 is driven to rotate, the transfer cylinder 5 is rotated in the direction indicated by the arrow a in FIG. 3 via the pulley 67, the belt 71, and the pulley 69. A gear 73 is coaxially fixed to the transfer cylinder 5.
A gear 75 is meshed with the gear 3. A gear 77 meshes with the gear 75. On the other hand, as shown in FIG.
Gears 78, 78 are coaxially arranged on the side, and these gears 78, 78 mesh with gears 79, 79, respectively. Therefore, the rotation of the transfer cylinder 5 causes the gear 7 to rotate.
The plate cylinder 1 rotates in the direction indicated by the arrow b in FIG. 3 via 3, 75, 77, 78, 78, 79, 79.

Similarly, a gear 81 is engaged with the gear 73, and a gear 83 is engaged with the gear 81.
On the plate cylinder 3 side, as shown in FIG.
Similar to the case of the plate cylinder 1, 8 and 78 are arranged coaxially, and gears 85 and 85 mesh with these gears 78 and 78, respectively. Therefore, when the transfer cylinder 5 rotates, the plate cylinder 3 rotates in the direction indicated by the arrow c in FIG. 3 via the gears 73, 81, 83, 78, 78, 85, 85. Note that the drive transmission mechanism is merely an example, and various rotation transmission configurations are possible.

Next, the configuration of the printing units 17 and 19 will be described. Since the printing units 17 and 19 have the same configuration, the printing unit 17 will be described as an example. As shown in FIGS. 2 and 4, inside the plate cylinder 1, a squeegee roller 87, a doctor roller 89, a lift roller 91, a lift cam 93, a lift lever 95, a lever return spring 97,
A lever detection sensor 99 is incorporated. As shown in FIG. 5, frames 101 and 103 are built in the plate cylinder 1, and other frames 105 and 107 are fixed to the angle 109 by screws 111 and 113. The angle 109 is a rail 12 fixed between the frames 115 and 117 by screws 119 and 121.
5 is arranged via rollers 125 and 127 so as to be movable in the left-right direction in FIG.

The doctor roller 89 is provided between the frames 101 and 103 by bearing members 129 and 131.
Is rotatably supported via shafts 89a, 89a. Further, the squeegee roller 87 is rotatably supported between the lift levers 95, 95 by bearing members 133, 135 via shafts 87a, 87a. Further, ink 137 is appropriately supplied to a contact point between the doctor roller 89 and the squeegee roller 87 from an ink supply mechanism (not shown).

At the time of printing standby, the state is as shown in FIG. 4, in which the convex surface of the lift cam 93 pushes up the lift roller 91, and the lift lever 95 shields the sensor 99. On the other hand, at the time of printing, first, as shown in FIGS.
Are rotated by a drive motor (not shown), whereby the meshing gear 141 is rotated. Lift cam 9
3 is coaxially fixed to the gear 141, so that the rotation of the gear 141 causes the lift cam 93 to rotate. Then, the lift cam 93 rotates by 180 ° from the state shown in FIG. By the rotation of the lift cam 93, the upward bias on the lift roller 91 is released, so that the lift lever 95 is moved to the lever return spring 97.
The squeegee roller 87 is moved downward in the figure as shown in FIG. Then, the plate cylinder 1 acts so as to be pressed against the transfer cylinder 5. At the same time, the shield of the sensor 99 is released. Printing is performed in such a state.
As described above, the printing unit 19 has the same configuration, and the same parts are denoted by the same reference numerals and description thereof is omitted. However, printing on the plate cylinder 1 side is performed on the surface of the printing paper 53 supplied by the paper feeding means 15 between the plate cylinder 1 and the transfer cylinder 5, whereas The printing on the third side is performed on the transfer cylinder 5, and the image once transferred to the transfer cylinder 5 is printed on the back surface of the printing paper 53.

Next, the configuration of the paper discharging means 21 will be described. The paper discharging means 21 includes a printing paper separating claw 143 and the paper discharging guide 1.
45, a paper discharge tray 147, and a paper discharge stopper 149. The printed printing paper 53 is peeled off from the transfer drum 5 by the paper separating claw 143 when the printing paper holding means 151 provided on the transfer drum 5 opens its leading end. Printing paper 53 peeled off
Are guided by the paper ejection guide 145 and fly until they collide with the paper ejection stopper 149, and after being collided with the paper ejection stopper 149, are stacked on the paper ejection table 147.

Next, the structure of the cleaning means 22 will be described. As shown in FIG. 2, the cleaning unit 22 includes a tank 155 containing a cleaning liquid 153, cleaning rollers 157, 159, 161, a cleaning cloth 163,
The cleaning cloth take-up roller 165, the driven roller 167, the pressing roller 169, and the like are included. When cleaning is performed by the cleaning means 22 having the above configuration, first, the plate cylinders 1 and 3 and the transfer cylinder 5 are separated from each other, and the transfer cylinder 5 is rotated in the direction of arrow a by the drive motor 65. Next, the cleaning roller 161 and the pressing roller 169 are pressed against the transfer cylinder 5 by a drive motor and a clutch (not shown). Thereby, first, the cleaning liquid 153 is supplied to the cleaning rollers 157, 159, 1
The coating material is applied to the outer peripheral surface of the transfer drum 5 through the reference numeral 61. By the application of the cleaning liquid 153, the ink adhering to the outer peripheral surface of the transfer cylinder 5 is in a state where it can be easily wiped off.

Then, the cleaning cloth 163 is pressed against the transfer cylinder 5 via the pressing roller 169, and is wiped off together with the cleaning liquid 153 to which the ink which has been easily wiped off is applied. Then, when the application of the cleaning liquid 153 and the wiping operation are completed within a predetermined range, the pressing of the cleaning roller 161 and the pressing roller 169 against the transfer cylinder 5 is released. Next, the cleaning cloth winding roller 1 is driven by a drive motor (not shown).
Rotate 65 to wipe off the ink and remove the dirty cleaning cloth 16
At the same time as the take-up roller 3, the unused cleaning cloth 163 is supplied to the portion of the pressing roller 169 by the driven roller 167 to prepare for the next cleaning.

Next, the structure of the control means 181 will be described with reference to FIG. There is an operation panel 183, and as shown in FIG. 1, the operation panel 183 is arranged on the front side of the upper surface in the appearance of the apparatus. On the operation panel 183, a print start key 185 for starting a series of operations from reading of a document to plate making, printing, and printing, a print stop key 187 for stopping these operations on the way, and a number of printed sheets Key 189 for setting the print speed, a print speed information input key 191 for arbitrarily setting the print speed, a single-sided / double-sided print selection key 1 for selecting single-sided printing or double-sided printing
93 is arranged. Further, a front / back designating switch 195 for selecting whether to print the data read by the document reading means 7 on the front surface or the back surface of the printing paper 53 is provided. Further, the control means 181 has a CPU (Central Processing Unit) 197, and the operation panel 183 described above.
Commands from various operation keys provided on the CPU 1
It is input to 97. The CPU 197 has an inverting circuit 19
9 and the memory 201 are connected so that signals can be exchanged. Then, the CPU 197
It is configured to output a control signal to the line thermal head 31 described above via the thermal head drive circuit 203.

The inversion of data by the inversion circuit 199 will be described in detail. For example, as shown in FIG.
In the case where the original is the original for surface printing 28 ', in order to print it on the surface of the printing paper 53 passing between the plate cylinder 1 and the transfer cylinder 5, the original 29' is reversed like a mirror image. It is necessary to carry out plate making in the condition That is, it is necessary to make the original 28 'for front-side printing, which is displayed as "ABC ---", in the base paper 29' for front-side printing in a state in which it is inverted like a mirror image. There is. Therefore, the inversion circuit 199 is operated to invert the read original data, and the plate making means 7 performs punching and plate making based on the inverted data. As a result, it is possible to print "ABC ---" from the left on the surface of the printing paper 53 that passes between the plate cylinder 1 and the transfer cylinder 5. On the other hand, the original is the original for printing on the back side 28 ".
In this case, if “DEF ---” is displayed on the original 28 ″, the original paper 2 for back side printing is left as it is.
It is sufficient to perforate and plate-making 9 ". As a result, the plate cylinder 1
Also, "DEF--" can be printed from the left side on the back surface of the printing unit 53 that passes between the transfer cylinders 5. Regarding the back side printing, as described above, the image is transferred from the plate cylinder 3 side to the transfer cylinder 5, and then transferred to the back side of the printing paper 53.

The operation when performing double-sided printing based on the above configuration will be described. First, an original 28 ′ for printing on the surface of the printing paper 53 is set on the original setting surface 23,
The cover is covered by the cover 25, and in this state, the original is read by the line sensor 26. The read print data is converted into an electric signal and transferred to the line thermal head 31 of the plate making means 9. On the other hand, the base paper 29 'is supplied from the base paper roller 27, and the line thermal head 31 perforates and plate-makes the base paper 29'. The perforated and perforated base paper 29 is conveyed in the direction of the plate cylinder 1 by rollers 39 and 41, and is sucked and held by the clamp mechanism 49 of the plate cylinder 1. After that, as the plate cylinder 1 rotates, the perforated and plate-made base paper 29 'is wound around the outer periphery of the plate cylinder 1 and is adsorbed and held by the ink adhering to the surface.

Next, the original 28 "for printing on the back side of the printing paper 53 is set on the original setting surface 23, covered with the cover 25, and in that state, the original is read by the line sensor 26. The print data is converted into an electric signal and transferred to the line thermal head 31 of the plate making means 9. On the other hand, the base paper 29 is supplied from the base paper roller 27, and the line thermal head 31 supplies the base paper 29 ". The perforated and plate-made base paper 29 is processed by the rollers 39 and 41 to form the plate cylinder 1.
, And is sucked and held by the clamp mechanism 49 of the plate cylinder 1. Up to this point, it is the same as the case for surface printing, but from there, the perforated and plate-made base paper 29 "
Is transferred to another plate cylinder 3 via the transfer cylinder 5 and wound. That is, the base paper 29 ″ held by the clamp mechanism 49 of the plate cylinder 1 is transferred to the electrostatic adsorption plate 217 of the transfer cylinder 5, and then to the clamp mechanism 49 of the plate cylinder 3. Is wound around the outer peripheral surface of the plate cylinder 3. The plate cylinder 1, the transfer cylinder 5, and the plate cylinder 3 have the same outer diameter and are configured to be rotationally driven in synchronization. By arranging each of the clamp mechanism 49, the electrostatic attraction plate 217, and the clamp mechanism 49 at a position where they can be delivered, the delivery operation can be performed.

Next, the printing operation will be described. First,
The printing paper 53 is supplied between the plate cylinder 1 and the transfer cylinder 5 from the paper feeding unit 15. The supplied printing paper 53 is held by being held between the leading end of the printing paper 53 and the blanket 173 by the plurality of claws 195 of the printing paper holding means 151. Then, the printing paper 53 passes between the plate cylinder 1 and the transfer cylinder 5, and at this time, the printing cylinder 53
The printing is performed by the printing unit 17 from the side, while the image once transferred from the plate cylinder 3 to the transfer cylinder 5 is printed on the back side of the printing paper 53. Then, the printing paper 53 on which printing has been performed is released from the holding of the printing paper holding means 151 at a predetermined timing, and is discharged via the paper discharging means 21. After the printing is completed, the base papers 29 wound around the plate cylinders 1 and 3 are discharged by the plate discharging means 11 and 13, respectively, and the transfer cylinder 5 is cleaned by the cleaning means 22.

Next, the process of reading the original data by the original reading means 7 and the process of perforating / making the plate by the plate making means 9 based on the read original data will be described in more detail with reference to the flowchart of FIG. First, double-sided printing is selected by the single-sided / double-sided printing selection key 193, and the front side is selected by the front / back designating switch 195, and the original 28 ′ for front side printing is set. Then, in step S1, the document data is read. That is, as described above, the original 28 ′ for printing on the surface of the printing paper 53 is set on the original setting surface 23, covered with the cover 25, and in that state, the original data is read by the line sensor 26. read. Then, the process proceeds to step S2, and the data of the front / back designating switch 195 is read. Here, since the front surface has already been selected by the front / back designating switch 195, the selection data is read. Next, the process proceeds to step S3, and it is determined whether the front side printing or the back side printing is performed. In this case, it is determined that the printing is front side printing. Then, the process proceeds to step S4. Here, the inverting circuit 199 inverts the data. That is, as shown in FIG. 10, the original data read by the line sensor 26 is inverted like a mirror image.
Then, the process proceeds to step S5, and the base paper 2 for surface printing is used.
9'is conveyed, and in step S6, energization / perforation is performed by the line thermal head 31.

Next, in step S7, the base paper 2
9'is cut by a cutter unit 37 at a predetermined length. Then, in step S8, it is determined whether the printing is front side printing or back side printing. In this case, since the front side printing is selected, the process proceeds to step S9, and the base paper 29 'is mounted on the front side printing plate cylinder 1. This completes the plate making / platening of the base paper 29 'for surface printing. Next, plate making and printing of the base paper 29 ″ for printing on the back side are performed. First, the back side is selected by the front / back designating switch 195.
Steps S1 and S2 are executed in the same manner as described above, and since it is determined in step S3 that the back side printing is performed, step S4 is bypassed and the process proceeds to step S5. That is, in this case, as shown in FIG. 10, since it is not necessary to invert the original data read by the line sensor 26, the subsequent perforation / platemaking is executed without operating the inversion circuit 199. Less than,
The process is performed in the same manner as above until reaching step S7, and since it is determined that the back side printing is performed in step S8, the process proceeds to step S10, and the base paper 2 is placed on the plate cylinder 3 for back side printing.
9 "will be printed.

The present invention is not limited to the above-mentioned one embodiment. The control content by the control means (for example, regarding which of front-side printing and back-side printing is reversed) may be appropriately set based on the plate cylinder, the transfer cylinder, the conveyance direction of the printing paper, and the like.

[0035]

As described in detail above, according to the stencil printing apparatus of the present invention, the stencil sheet is formed by the reverse image formed on the first plate cylinder and the normal image formed on the second plate cylinder. The base paper to be formed can be plate-formed by one plate-making means, and the cost can be reduced and the apparatus can be downsized as compared with the case where two plate-making means are provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and is a perspective view showing an appearance of a stencil printing apparatus.

FIG. 2 is a view showing an embodiment of the present invention and is a side view showing an outline of an internal configuration of a stencil printing apparatus.

FIG. 3 is a diagram showing an embodiment of the present invention, and is a side view showing a schematic internal configuration of a stencil printing apparatus and a configuration of a rotation transmission mechanism for rotating a plate cylinder and a transfer cylinder.

FIG. 4 is a view showing an embodiment of the present invention, and is a side view showing an internal structure of the plate cylinder, centering on a structure of a printing unit at the time of printing.

FIG. 5 is a view showing an embodiment of the present invention, and is a cross-sectional view showing an internal configuration of the plate cylinder and focusing on a printing unit.

FIG. 6 is a view showing an embodiment of the present invention, and is a side view showing an internal configuration of the plate cylinder, focusing on the configuration of a printing unit at the time of printing.

FIG. 7 is a view showing an embodiment of the present invention and is a side view showing a rotation operation of a lift cam of a printing unit.

FIG. 8 is a diagram showing an embodiment of the present invention and is a block diagram showing a configuration of control means.

FIG. 9 is a diagram showing an embodiment of the present invention and is a flowchart showing plate making / plate deposition in the order of steps.

FIG. 10 is a diagram showing an embodiment of the present invention and is a perspective view showing how data is inverted when a base paper for front surface printing is plate-made.

FIG. 11 is a side view schematically showing a main part of a stencil printing machine showing a conventional example.

[Explanation of symbols]

 1 plate cylinder (first plate cylinder) 3 plate cylinder (second plate cylinder) 5 transfer cylinder 7 original reading means 9 plate making means 28 original 29 original paper 181 control means 199 inversion circuit

Claims (1)

[Claims] 1. A manuscript reading unit for reading manuscript data from a manuscript, a plate making unit for punching and making a plate on a base paper based on the manuscript data read by the manuscript reading unit, and a base paper for surface printing. A first plate cylinder, a second plate cylinder around which a base paper for printing on the back side is wound, a transfer cylinder to which an ink image of the second plate cylinder is transferred, and the first plate cylinder for printing on the surface of the printing paper. In the stencil printing apparatus provided with a printing means for performing printing on the back surface by the transfer cylinder, and a selection means for selecting a printing plate for front surface printing or a printing plate for back surface printing, a printing plate for front surface printing by the selection means. When is selected, the plate making by the plate making unit is controlled so as to form an inverted image with respect to the document data read by the document reading unit,
When the plate making for the back side printing is selected by the selecting device, there is provided a control device for controlling the plate making by the plate making device to be a normal image for the document data read by the document reading device. Stencil printer.