JP2021123023A - Registration system and registration method, and registration program in printer - Google Patents

Abstract

To provide registration system, method and program in a printer which can suppress occurrence of color tone failure due to doubling at the registration time.SOLUTION: A registration system is provided with a plurality of printing units which performs printing of a plurality of different colors including a reference color on a printing object, and each of the plurality of printing units comprises a plate cylinder. The system comprises: positional deviation amount acquisition means 13 which acquires a positional deviation amount of a printed image of other color with respect to a printed image of the reference color printed on the printing object by the plurality of printing units; and plate cylinder moving means 15 which moves a plate cylinder of a positionally deviated color of the plurality of plate cylinders in order to eliminate the positional deviation amount acquired by the positional deviation amount acquisition means 13. The plate cylinder moving means moves the plate cylinder so as to execute movement of the printed image for eliminating the positional deviation amount while dividing the movement into multiple movements with a movement amount smaller than the positional deviation amount.SELECTED DRAWING: Figure 2

Description

The present invention relates to a registration system, a registration method, and a registration program in a printing machine for performing registration.

In such a printing machine, the register mark of each color of the printed matter printed by the printing unit of a plurality of colors is imaged by the imaging means, and the misalignment of the register mark of each other color with respect to the register mark of the reference color is detected from the captured information. Some of them have an automatic registering function that adjusts the register by moving the plate cylinders of other colors so as to eliminate this misalignment (see, for example, Patent Document 1).

In addition, the distance from the register mark of the reference color to the register mark of another color is detected, the difference between the distance and the preset target distance is calculated, and each plate cylinder is set so that the difference is eliminated. A moving one has also been proposed (see, for example, Patent Document 2).

The following are possible causes for the misalignment of the register mark of each other color with respect to the register mark of the reference color.
The surface of the plate mounted on the plate cylinder has a portion that receives water and repels ink and a portion that repels water and receives ink. The former is a non-image portion in which an image is not formed, and the latter is an image portion in which an image is formed. Then, the water on the surface of the plate on which the reference color is printed may adhere to the printing paper on the impression cylinder via the blanket cylinder, and the printing paper may be stretched. If the next color is printed in this state, the next color may be printed at a position deviated from the printing position where the reference color is printed.

Japanese Patent No. 2733941 JP-A-2017-202630

When the above misalignment occurs, in both Patent Documents 1 and 2, the plate cylinder is moved by the misaligned distance so that the misalignment disappears at once. Then, doubling (a phenomenon in which printed images are duplicated) occurs in a predetermined number of printed matter after movement. When this doubling occurs, the shading of the image changes, which may cause poor color tone, and early improvement is desired.

The present invention has been made to solve such a problem, and by providing a registration system, a registration method, and a registration program in a printing machine capable of suppressing the occurrence of color tone defects due to duplication at the time of registration. be.

In order to achieve the above object, the registering system in the printing machine according to the present invention is provided with a plurality of printing units for printing a plurality of different colors including a reference color on a printing object, and the plurality of printing units of the plurality of printing units are provided. Each is provided with a plate cylinder, and a misalignment amount acquisition means for acquiring a misalignment amount of a print image of another color with respect to a print image of a reference color printed on a print object by the plurality of printing units, and a misalignment amount acquisition means. A registering system in a printing machine provided with a plate cylinder moving means for moving a plate cylinder of a color that is misaligned among the plurality of plate cylinders in order to eliminate the misalignment amount acquired by the amount acquisition means. In the plate cylinder moving means, the plate cylinder is moved so that the movement of the printed image for eliminating the misalignment amount is divided into a plurality of movements with a movement amount smaller than the misalignment amount. It is characterized by that.

According to the above configuration, the printing image is moved to eliminate the misalignment amount by moving the plate cylinder in order to divide the movement of the printed image into a plurality of movements with a movement amount smaller than the misalignment amount. It is possible to suppress the change in color tone of the printed matter due to duplication while performing the above.

Further, in the registering system in the printing machine according to the present invention, after the plate cylinder moving means moves the tip of the plate cylinder based on the small movement amount, the movement amount becomes the small movement amount after a predetermined time elapses. It may be a means for controlling the next movement of the plate cylinder based on the plate cylinder.

As described above, a stable printing state is obtained when a predetermined time elapses after moving the tip of the plate cylinder based on a small movement amount. By moving the plate cylinder from the stable printing state to the next movement based on a small movement amount, it is possible to effectively suppress the color tone change of the printed matter due to duplication.

Further, the present invention is a register in a printing machine for registering the plate cylinder by using a printing machine including a plurality of printing units having a plate cylinder for printing a plurality of different color prints including a reference color on a printing object. In the matching method, a misalignment amount acquisition step for acquiring a misalignment amount of a print image of another color with respect to a print image of a reference color printed on a print target by the plurality of printing units, and a misalignment amount acquisition step for acquiring the misalignment amount. In order to eliminate the acquired misalignment amount, the plate cylinder moving step for moving the misaligned color plate cylinder among the plurality of plate cylinders is provided, and the plate cylinder moving step includes the misalignment amount. This is a registering method in a printing machine, characterized in that the plate cylinder is moved in order to divide the movement of the printed image into a plurality of movements with a movement amount smaller than the displacement amount. You may.

According to the above configuration, the printing image is moved to eliminate the misalignment amount by moving the plate cylinder in order to divide the movement of the printed image into a plurality of movements with a movement amount smaller than the misalignment amount. It is possible to suppress the change in color tone of the printed matter due to duplication while performing the above.

Further, the present invention is provided with a plurality of printing units for printing a plurality of different color prints including a reference color on a printing object, each of the plurality of printing units including a plate cylinder, and the plurality of printing units. To eliminate the misalignment amount acquisition means for acquiring the misalignment amount of the printed image of another color with respect to the print image of the reference color printed on the print target, and the misalignment amount acquired by the misalignment amount acquisition means. In a registering system in a printing machine including a plate cylinder moving means for moving a plate cylinder of a color that is misaligned among the plurality of plate cylinders, the misaligned plate cylinder moving means causes the misalignment. It is a registering program of a printing machine for automatically performing a process of registering by moving a plate cylinder of a certain color using a computer, and is a print image for eliminating the amount of misalignment of the computer. Even if it is a registering program in a printing machine for functioning as a control unit for controlling the movement of a plate cylinder so that the movement of the plate can be divided into a plurality of movements with a movement amount smaller than the displacement amount. good.

According to the above configuration, the printing image is moved to eliminate the misalignment amount by moving the plate cylinder in order to divide the movement of the printed image into a plurality of movements with a movement amount smaller than the misalignment amount. It is possible to suppress the change in color tone of the printed matter due to duplication while performing the above.

According to the present invention, the plate cylinder is moved to register the printed image in order to divide the movement of the printed image for eliminating the misalignment into a plurality of movements with a movement amount smaller than the misalignment amount. It is possible to provide a registration system, a registration method, and a registration program in a printing machine that can suppress the occurrence of color tone defects due to duplication from time to time.

It is a side view of a printing machine. It is a block diagram which shows the control structure of the registering system in a printing machine. It is explanatory drawing which shows the relationship between the reference register mark and the 1st register mark printed by being misaligned on the printing paper. It is a flowchart for performing the register measurement of the first trial printing. It is a flowchart for performing registration correction processing during test printing. It is a flowchart for performing registration correction processing during main printing. It is a flowchart which shows the process when it becomes No in step 31 of FIG. It is a flowchart which shows the register correction processing in the oblique image direction of FIG. It is a flowchart which shows the register correction processing in the top-bottom direction of FIG. It is a flowchart which shows the register correction processing in the left-right direction of FIG.

Hereinafter, the registration system in the printing press according to the embodiment of the present invention will be described with reference to the drawings.

The printing machine 1 includes a paper stack 2, a paper feed unit 4 for feeding the printing paper to be printed one by one from the paper stack 2 by the feeder device 3, and printing sent from the paper feed unit 4. A printing unit 5 for printing five different colors (colors including at least one special color) on the paper, and each ink pot key (sometimes simply called a key) of the printing paper (printed matter) printed by the printing unit 5. The RGB camera 6, which is an RGB image pickup means for capturing a plurality of solid patches (not shown) and register marks 17 and 18 (see FIG. 3) printed in the range corresponding to), and the printing paper after imaging. It is provided with a paper ejection unit 7 for transporting and ejecting paper. The plurality of solid patches are for measuring the density (color tone) of the image of the printed printing paper, so that the target density (color tone) set based on the data of the plurality of solid patches captured is obtained. Adjust the opening of each ink pot key. In FIG. 1, the paper stacking table 2 side is the front side, the paper ejection portion 7 side is the rear side, and the direction of penetrating the paper surface is the left-right direction (or width direction), which will be described below.

The printing unit 5 has four printing units 5A, 5B, 5C, 5D for printing the four process colors K (black), C (cyan), M (magenta) Y (yellow), and other than the four process colors. It is equipped with a printing unit 5E that prints a spot color that is a color. In this embodiment, the printing unit 5E for printing the spot color is arranged at the rear end, but it may be arranged at any position. In each printing unit 5A, 5B, 5C, 5D, 5E, a plate cylinder 51 on which a plate is wound, a rubber cylinder (blanket cylinder) 52 on which ink from the plate cylinder 51 is transferred, and a rubber cylinder 52 form printing paper. The impression cylinder 53 that press-welds the ink on the rubber cylinder 52 to transfer the ink on the printing paper to the printing paper, the transfer cylinder 54 that is arranged on the starting end side in the transport direction for delivering the printing paper to the impression cylinder 53, and the printed printing paper. Is provided with a transfer cylinder 55 arranged on the terminal side in the transfer direction for transferring the ink to the next printing unit. Further, each printing unit 5A, 5B, 5C, 5D, 5E is provided with a registering device (not shown), and a registering system is configured from all the registering devices.

The RGB camera 6 is housed in a box 9 arranged at the upper part on the front end side of the paper ejection unit 7, and is arranged in step 10 between the printing unit 5E located at the rearmost portion and the paper ejection unit 7. Multiple solid patches and register marks on the printing paper conveyed through the formed openings (not shown) are imaged. The opening can be switched between an open state and a closed state by a lid (not shown) that can be opened and closed. Further, when it is desired to cross step 10 for the purpose of inspection or trouble solving on each of the pair of side wall portions 11 and 11 (only one side is shown in FIG. 1) provided in the left-right direction of the paper ejection portion 7, an RGB camera is used. A push button 12 for suspending and resuming the imaging by 6 is provided. By pressing the push button 12, the imaging by the RGB camera 6 is interrupted, and by pressing the push button 12 again, the imaging by the RGB camera 6 is restarted. The push button 12 can also be provided on the rear wall portion of the paper ejection portion 7. Further, when the vehicle is interrupted, the push button 12 blinks to notify the operator that the vehicle is interrupted. Examples of the RGB camera 6 as the imaging means include a line sensor camera, a CMOS camera, and a CCD camera. The imaged data of the register marks (register marks printed by the five printing units 5A, 5B, 5C, 5D, and 5E) captured by the RGB camera 6 is provided in the misalignment amount acquisition means 13 provided in the control unit S shown in FIG. Positional deviation in which the register marks (cyan, magenta, yellow, spot color) of other colors are misaligned with respect to the reference register mark (black in this embodiment) that is input and is used as the reference by the misalignment amount acquisition means 13. Calculate and obtain the amount. When the printing machine 1 is configured as a reversing machine having a reversing device between the printing units, the RGB camera 6 is also provided at the arrangement position of the reversing device so that the preprinted surface (the surface to be printed before the reversing) is provided. ) Can be configured to capture multiple solid patches.

FIG. 2 shows a block diagram of the registering system in the printing machine of the present invention. That is, the registration system includes a misalignment amount acquisition means 13 for acquiring a misalignment amount of a print image of another color with respect to a print image of a reference color printed on a printing paper by a plurality of printing units, and a misalignment amount acquisition means. It is provided with a plate cylinder moving means 15 for moving a plate cylinder of a color that is displaced among a plurality of plate cylinders in order to eliminate the misalignment amount acquired by 13.

As described above, the misalignment amount acquisition means 13 is a reference register mark among the five register marks captured by the RGB camera 6 (in this embodiment, black is used, but other colors may be used). This is a means for calculating and acquiring the amount of misalignment in which the register marks (cyan, magenta, yellow, spot color) of other colors are misaligned with respect to the above.

FIG. 3 shows an example in which the first register marks 18, 18 which are other colors are misaligned with respect to the reference register marks 17, 17. In FIG. 3, the vertical direction of the paper surface is the top-bottom direction which is the transport direction W of the printing paper 19, the top side is the rear end portion of the transport direction W, and the ground side is the start end portion of the transport direction W. In addition, the left-right direction of the paper surface is the left-right direction orthogonal to the top-bottom direction. In FIG. 3, the first register marks 18 and 18 are displaced to the right by F1X with respect to the reference register marks 17 and 17 in the left-right direction, and the first register mark 18 and 18 on the left side with respect to the reference register mark 17 on the left side in the vertical direction. The register mark 18 is displaced to the top by F1Y, and the first register mark 18 on the right side is displaced to the top by F2Y (F1Y <F2Y) with respect to the reference register mark 17 on the right side. When F1Y <F2Y, it means that there is a misalignment in the oblique image direction.
Such misalignment can be eliminated by adjusting the position of the plate cylinder in the top-bottom direction, the left-right direction, and the oblique image direction. The adjustment of the plate cylinder in the top-bottom direction is to adjust the rotation position (phase) of the plate cylinder, and the adjustment of the plate cylinder in the left-right direction is to adjust the left-right position by moving the plate cylinder in the left-right direction. The adjustment of the oblique image direction of the plate cylinder is to tilt the rotation axis of the plate cylinder. Since the configuration for these adjustments is a well-known technique, the description thereof will be omitted.

The plate cylinder moving means 15 is a means for moving the plate cylinder so that the movement of the printed image for eliminating the misalignment amount is divided into a plurality of movements with a movement amount smaller than the misalignment amount. In this embodiment, the small movement amount is set to 0.02 mm. The reason why it is set to 0.02 mm is that it is generally said that the influence on the color tone can be ignored. When the small movement amount is set to 0.02 mm and the misalignment amount is 0.02 mm or less, the plate cylinder movement is not executed in a plurality of times, but as one movement. Will be executed. The setting of 0.02 mm can be changed to an arbitrary value.

Next, the registration in the test printing will be described. In the registration in the trial printing, as shown in FIG. 4, the registration measurement of the first trial printing is performed, and the registration correction processing during the trial printing shown in FIG. 5 is performed based on the registration measurement result. First, it will be described from the flowchart of FIG. In the first register measurement of the test print, the register mark of each of the four colors is measured with respect to the reference register mark of black. In FIG. 4, the register mark of one color is measured with respect to the reference register mark. It shows the case of measuring the misalignment of. Further, when 30 sheets are printed, for example, 20 sheets of 20 sheets of the 11th to 30th sheets are imaged by the RGB camera 6 to detect the misalignment of the register mark of another color with respect to the reference register mark. doing. The average value of all the detected misalignments is used as the misalignment value.

First, in the control unit S, among the five registration marks imaged by the RGB camera 6, the registration marks of other colors (for example, cyan) are misaligned with respect to the reference registration mark (black in this embodiment). The misalignment amount (register misalignment amount) is calculated, and it is determined whether or not it is equal to or less than the preset OK determination misalignment amount (for example, the set value A) (step S1). In this embodiment, the set value A, which is the amount of deviation in the OK determination, is set to, for example, 0.10 mm. When the amount of registration deviation is equal to or less than the set value A (0.10 mm), the control unit S calculates the amount of registration correction (position deviation amount) for each of the oblique image, the top-bottom direction, and the left-right direction (step S2). When the calculation of the registration correction amount is completed, the registration correction amount in the oblique image direction is divided into the preset 0.02 mm (movement amount smaller than the displacement amount) described above, and the registration correction number is set (step S3). .. For example, when the calculated amount of registration correction in the oblique image direction is 0.04 mm, the number of registration corrections is two, the first is 0.02 mm, and the second is 0.02 mm as well. Subsequently, the registration correction amount in the top-bottom direction is divided into the preset 0.02 mm units described above, and the registration correction number is set (step S4). For example, when the calculated amount of registration correction (positional deviation amount) in the vertical direction is 0.03 mm, the number of registration corrections is two, the first is 0.02 mm, and the second is 0.01 mm. Subsequently, the registration correction amount in the left-right direction is divided into 0.02 mm units as described above, and the registration correction number is set (step S5). For example, when the calculated amount of registration correction in the left-right direction is 0.05 mm, the number of corrections is 3 times, the first time is 0.02 mm, the second time is 0.02 mm, and the third time is 0.01 mm. Become. When the calculation of the number of registration corrections and the registration correction amount in each of the three directions is completed, the process proceeds to the correction processing during the trial printing. In step S1, when the register deviation amount is, for example, 0.12 mm, the control unit S determines that the set value A (0.10 mm) is exceeded, so that the registration deviation amount can be efficiently corrected. , Ordinary automatic register correction is performed (step S6). If there is even one other color that is determined to exceed such a set value A, normal automatic register correction is performed for all the other colors. After the normal automatic register correction, the process ends. The normal automatic register correction is to move the plate cylinder at once based on the misalignment amount (registration amount) to perform the register correction. Although not shown, register measurement is performed for three colors other than cyan (magenta, yellow, and spot color) in the same manner.

Next, the register correction process during the test printing shown in FIG. 5 will be described. First, the control unit S confirms whether or not the registration correction in the oblique image direction is being stopped (step S10). That is, it is confirmed whether or not the registration correction in the oblique image direction of the plate cylinder is performed. If the register correction in the oblique image direction of the plate cylinder has been performed, the process proceeds to step S14. If the registration correction in the oblique image direction of the plate cylinder has not been performed, it is confirmed whether or not there is the remaining registration correction number in the oblique image direction (step S11). If there is the remaining registration correction number in the oblique image direction, the oblique image direction is changed by the Nth registration correction amount from the current position (if the previous time was the first time, this time is the second time). The position (tilt) of is corrected (step S12). When the correction is completed, the number of remaining registration corrections in the oblique image direction is subtracted (step S13), and the process proceeds to step S14. If there is no remaining register correction number in the oblique image direction in step S11, the process proceeds to step S14.

In step S14, it is confirmed whether or not the registration correction in the vertical direction is stopped. That is, it is confirmed whether or not the registration correction in the vertical direction of the plate cylinder is performed. If the register correction in the vertical direction of the plate cylinder has been performed, the process proceeds to step S18. If the registration correction in the top-bottom direction of the plate cylinder has not been performed, it is confirmed whether or not there is the remaining registration correction number in the top-bottom direction (step S15). If there is the remaining number of registration corrections in the top-bottom direction, rotate the plate cylinder by the amount of registration correction N times from the current position in the top-bottom direction (if the previous time was the first time, this time the second time). The position of the above in the vertical direction is corrected (step S16). When the correction is completed, the number of remaining registration corrections in the vertical direction is subtracted (step S17), and the process proceeds to step S18. If there is no remaining register correction number in the vertical direction in step S15, the process proceeds to step S18.

In step S18, it is confirmed whether or not the registration correction in the left-right direction is stopped. That is, it is confirmed whether or not the register correction in the left-right direction of the plate cylinder is performed. If the register correction in the left-right direction of the plate cylinder has been performed, the process proceeds to step S22. If the plate cylinder has not been corrected for registration in the left-right direction, it is confirmed whether or not there is a remaining number of registration corrections in the left-right direction (step S19). If there is the remaining number of registration corrections in the left-right direction, the plate cylinder is moved to the left-right direction by the Nth (if the previous time was the first time, this time the second time) registration correction amount from the current position to correct the left-right direction ( Step S20). When the correction is completed, the number of remaining register corrections in the left-right direction is subtracted (step S21), and the process proceeds to step S22. If there is no remaining register correction number in the left-right direction in step S19, the process proceeds to step S22. In step S22, it is confirmed whether or not the registration correction of all the plate cylinders in the three directions (oblique image direction, top-bottom direction, left-right direction) is completed. If all the registration corrections are completed, the registration correction processing is completed, and if all the registration corrections are not completed, the process returns to step S10. When the register correction amount (positional deviation amount) during the test printing is 0.05 mm, the plate cylinder is moved by 0.02 mm at the first time, and 0.02 mm at the second time is moved immediately after the movement is completed. Immediately after the movement, the third 0.01 mm is moved so that the register is adjusted. By moving the plate cylinder immediately in this way, registration can be performed quickly. It should be noted that a step for the passage of time may be provided between each movement so that the plate cylinder is not moved immediately.

In the register correction process during the trial printing of FIG. 5, when the density (color tone) of the image on the printed printing paper is OK, the trial printing is shifted to the main printing at that stage. Therefore, there is a case where the final printing is performed with a part of the register correction processing during the trial printing remaining. The register correction process will be performed even during the main printing, and the register correction process during the main printing will be described with reference to the flowchart of FIG.

First, the control unit S confirms whether or not the registering devices of all the units are stopped (step S30). In other words, it is confirmed whether there is a unit in which the plate cylinder is moved for register correction. If the registering devices of all the units are stopped, the process proceeds to step S31, and if the registering devices of all the units are not stopped, the registration correction process ends. In step S31, it is confirmed whether or not the oblique image of the main printing, the top and bottom, and the remaining number of corrections in the left-right direction are all 0. That is, it is confirmed whether the register correction processing during the test printing remains. If the number of remaining corrections in all directions is all 0, the process proceeds to step S32, and if the number of remaining corrections in all directions is not all 0, the process proceeds to step S40 (see FIG. 7).

In the registration correction process during the main printing, it is confirmed whether or not the position shift amount is measured by the RGB camera 6 in step S32. For the measurement of the amount of misalignment, for example, the RGB camera 6 is used to detect misregistration every 50 sheets (corresponding to each Z rotation), and the last 20 sheets (31st to 50th sheets) are printed. The average value of all the misalignment amounts of the paper is taken as the misalignment value. When the measurement is performed, the process proceeds to step S33. If the measurement has not been performed, the process proceeds to step S39. That is, after measuring the amount of misregistration, the process proceeds to step S33. Then, when the measurement is performed, the control unit S confirms whether or not the machine rotation has advanced by X rotations (arbitrary preset rotation speed) or more since the registering devices of all the units have stopped in step S33. do. This becomes a stable printing state as time passes after the registration correction is performed. This is to acquire the measurement result from the printing paper printed in the stable printing state.

When the control unit S determines in step S33 that the mechanical rotation has advanced by X rotations or more since the registering devices of all the units have stopped, the register correction amounts in the oblique image, top and bottom, and left-right directions are calculated. It is confirmed whether or not (step S34), and if it is not calculated, the register correction amount in the oblique image, top and bottom, and left-right directions is calculated (step S35). After calculating the registration correction amount, registration correction processing that requires registration correction, that is, registration correction processing in the oblique image direction (step S36), registration correction processing in the vertical direction (step S37), and registration correction processing in the left-right direction (step S38). ), Then the process proceeds to step S39. In step S39, it is confirmed whether or not all the registration corrections in the three directions (oblique image direction, top-bottom direction, and left-right direction) have been completed. If all registration corrections have been completed, the registration correction processing is completed, and if all registration corrections have not been completed, the process returns to step S30.

In step S31, the control unit S shifts to step S40 shown in FIG. 7 when the number of remaining corrections in all directions is not 0, that is, when register correction remains. In step S40, it is confirmed whether or not the machine rotation has advanced by Y rotation (arbitrary preset rotation speed) or more after the registering devices of all the units are stopped. This is because the next registration correction is performed after a lapse of time from the registration correction. A stable printing state is obtained when a predetermined time elapses after the registration correction is performed. By moving the plate cylinder from the stable printing state, it is possible to effectively suppress the color tone change due to duplication. In particular, during main printing, it is necessary to suppress the occurrence of doubling, which causes spoiled paper (defective paper judged to be printing defects), as much as possible, and the plate cylinder is moved from the stable printing state as described above. Is effective. The control unit S ends the registration correction process if the mechanical rotation has not advanced by Y rotation or more since the registering device of all the units has stopped in step S40, and if it has advanced by Y rotation or more, the oblique image direction. It is confirmed whether or not there is a remaining number of corrections of the register (step S41). If there is a remaining number of corrections in the oblique image direction, the oblique image direction is corrected by the Nth correction amount from the current position (if the previous time was the first time, this time is the second time) (step S42), and the oblique image direction is corrected. The remaining number of times is subtracted (step S43), and the process returns to step S39 (see FIG. 6). In step S41, if there is no remaining number of corrections in the oblique image direction, it is confirmed whether or not there is a remaining number of corrections in the top-bottom direction, which is the next correction (step S44). If there is a remaining number of corrections in the top-bottom direction, the top-bottom direction is corrected by the Nth correction amount from the current position (if the previous time was the first time, this time is the second time) (step S45), and the remaining number of corrections in the top-bottom direction is calculated. Subtract (step S46) and return to step S39 (see FIG. 6). If there is no remaining number of corrections in the top-bottom direction in step S44, the process proceeds to the next correction, and it is confirmed whether or not there is a remaining number of corrections in the left-right direction, which is the next correction (step S47). If there is a remaining number of corrections in the left-right direction, the left-right direction is corrected by the Nth correction amount from the current position (if the previous time was the first time, this time is the second time) (step S48), and the remaining number of corrections in the left-right direction is corrected. Subtract (step S49) and return to step S39 (see FIG. 6). If there is no remaining number of corrections in the left-right direction, the process returns to step S39 (see FIG. 6).

The registration correction process in the oblique image direction in step S36 of FIG. 6 will be described with reference to FIG. It should be noted that the registration correction processing in the oblique image direction of the plate cylinder is performed for each unit, but only one unit will be described with reference to FIG. The control unit S confirms whether or not there is a register correction amount in the oblique image direction (step S50). That is, it is confirmed whether or not the register marks of other colors (cyan) are displaced in the oblique image direction with respect to the reference register mark (black) among the five register marks captured by the RGB camera 6. When the control unit S determines that there is a register correction amount in the oblique image direction, for example, when the register correction amount in the oblique image direction is 0.05 mm, the control unit S divides 0.05 mm into 0.02 mm units. When divided, the number of registration corrections is 3, the first is 0.02 mm, the second is 0.02 mm, and the third is 0.01 mm, and the number of registration corrections and the amount of registration correction are set (step S51). When set, the oblique image direction is corrected by moving the plate cylinder by the Nth (first time if it is the first time) register correction amount from the current position (step S52). After the correction, the number of remaining registration corrections in the oblique image direction is subtracted (step S53), and the process proceeds to step S37 in FIG. If there is no registration correction amount in the oblique image direction in step S50, the process proceeds to step S37 in FIG.

The registration correction process in the vertical direction in step S37 of FIG. 6 will be described with reference to FIG. Although the registration correction process in the vertical direction is performed for each unit, only one unit will be described in FIG. The control unit S confirms whether or not there is a register correction amount in the vertical direction (step S60). That is, it is confirmed whether or not the register marks of other colors (cyan) are displaced in the vertical direction with respect to the reference register mark (black) among the five register marks captured by the RGB camera 6. When the control unit S determines that there is a register correction amount in the top-bottom direction, for example, when the register correction amount in the top-bottom direction is 0.05 mm, the control unit S divides 0.05 mm into 0.02 mm units. When divided, the number of registration corrections is 3, the first is 0.02 mm, the second is 0.02 mm, and the third is 0.01 mm, and the number of registration corrections and the amount of registration correction are set (step S61). .. When set, the vertical direction is corrected by rotating the plate cylinder by the Nth (first time if it is the first time) register correction amount from the current position (step S62). After the correction, the number of remaining registration corrections in the vertical direction is subtracted (step S63), and the process proceeds to step S38 in FIG. If there is no register correction amount in the vertical direction in step S60, the process proceeds to step S38 in FIG.

The left-right direction registration correction process in step S38 of FIG. 6 will be described with reference to FIG. Although the registration correction process in the vertical direction is performed for each unit, only one unit will be described in FIG. The control unit S confirms whether or not there is a register correction amount in the left-right direction (step S70). That is, it is confirmed whether or not the register marks of other colors (cyan) are displaced in the left-right direction with respect to the reference register mark (black) among the five register marks captured by the RGB camera 6. When the control unit S determines that there is a register correction amount in the left-right direction, for example, when the register correction amount in the left-right direction is 0.05 mm, the control unit S divides 0.05 mm into 0.02 mm units. When divided, the number of registration corrections is 3, the first is 0.02 mm, the second is 0.02 mm, and the third is 0.01 mm, and the number of registration corrections and the amount of registration correction are set (step S71). When set, the plate cylinder is moved in the left-right direction by the Nth (first time if it is the first time) registration correction amount from the current position to correct the left-right direction (step S72). After the correction, the number of remaining register corrections in the left-right direction is subtracted (step S73), and the process proceeds to step S39 in FIG. If there is no register correction amount in the left-right direction in step S70, the process proceeds to step S39 in FIG.

Further, in FIG. 6, when performing the second or third registration correction in the oblique image direction, the control unit S rotates the machine X times after the registration devices of all the units are stopped in step S33 each time. Since it is executed after confirming whether or not the progress has been made, as described above, a stable printing paper can be obtained after a predetermined time has passed since the previous registration correction was performed, and the measurement result (register) from the printing paper is obtained. Not only can the correction amount) be obtained, but also the occurrence of doubling can be effectively suppressed. The same applies to the second and third registration corrections in the top-bottom direction and the left-right direction. As described above, the machine rotation rotates X and the machine rotation Y rotates means that the number of printed printing papers has reached a predetermined number, for example, when the number of printed sheets reaches a predetermined number (for example, 10 sheets). In addition, the following registration correction is performed. This predetermined number of sheets is the number of sheets at which the image (including the register mark) on the rubber cylinder 52 from which the ink supply is cut off is removed (eliminating doubling) to the extent that the ink is not transferred to the printing paper by printing about the predetermined number of sheets. .. This predetermined number of sheets can be changed according to the paper quality of the printing paper and the like.

During main printing, when the printing paper on which the movement of the plate cylinder at the end of multiple registration corrections (third if three times) is printed is not completed by the 30th sheet (= 50 sheets-20 sheets). Since there is a possibility that the register mark before or during the movement of the plate cylinder is detected (imaged) by the RGB camera 6, the movement of the plate cylinder due to the detection result of the next (after 50 sheets) misalignment is skipped. I try not to be done. The 30 sheets are an example and can be changed arbitrarily.

Further, the present invention is a register in a printing machine for registering the plate cylinder by using a printing machine including a plurality of printing units having a plate cylinder for printing a plurality of different color prints including a reference color on a printing object. In the matching method, a misalignment amount acquisition step for acquiring a misalignment amount of a print image of another color with respect to a print image of a reference color printed on a print target by the plurality of printing units, and a misalignment amount acquisition step for acquiring the misalignment amount. In order to eliminate the acquired misalignment amount, the plate cylinder moving step for moving the misaligned color plate cylinder among the plurality of plate cylinders is provided, and the plate cylinder moving step includes the misalignment amount. This is a registering method in a printing machine, characterized in that the plate cylinder is moved in order to divide the movement of the printed image into a plurality of movements with a movement amount smaller than the displacement amount. You may.

Further, the present invention is provided with a plurality of printing units for printing a plurality of different color prints including a reference color on a printing object, each of the plurality of printing units including a plate cylinder, and the plurality of printing units. To eliminate the misalignment amount acquisition means for acquiring the misalignment amount of the printed image of another color with respect to the print image of the reference color printed on the print target, and the misalignment amount acquired by the misalignment amount acquisition means. In a registering system in a printing machine including a plate cylinder moving means for moving a plate cylinder of a color that is misaligned among the plurality of plate cylinders, the misaligned plate cylinder moving means causes the misalignment. It is a registering program of a printing machine for automatically performing a process of registering by moving a plate cylinder of a certain color using a computer, and is a print image for eliminating the amount of misalignment of the computer. Even if it is a registering program in a printing machine for functioning as a control unit for controlling the movement of a plate cylinder so that the movement of the plate can be divided into a plurality of movements with a movement amount smaller than the displacement amount. good.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the printing machine including five units is shown, but it may be a printing machine including two or more arbitrary number of units. Further, a printing machine including a plurality of units may print with a smaller number of units (at least 2 units or more) than the total number of units.

Further, although the RGB camera 6 is used in the above embodiment, the configuration may be such that the positional deviation is detected by using a spectrophotometer. Further, when a spectrophotometer is used, the operator may take out the printed printing paper and detect the misalignment with the spectrophotometer.

Further, in the above-described embodiment, the case where the registration correction is automatically performed by the control unit S is shown, but the operator may drive the registration device at an arbitrary timing to perform the registration correction. In this case, the operator moves the plate cylinder of the misaligned color in order to execute the movement of the printed image in a plurality of movements with a movement amount smaller than the acquired position shift amount.

Further, in the above-described embodiment, the register mark printed by each printing unit is imaged to detect the misalignment, but the printed image may be imaged to detect the misalignment.

Further, in the above-described embodiment, the movement amount smaller than the misalignment amount is set to a predetermined value (0.02 mm), but a plurality of different sizes of different movement amounts (movement smaller than the misalignment amount) are set. Amount) may be used, or for example, the amount of misalignment may be divided into smaller movement amounts evenly or unevenly, and a plurality of the divided movement amounts may be used.

Further, in the above-described embodiment, registering is performed by using the plate cylinder moving means 15 at both the trial printing and the main printing, but the plate cylinder moving means 15 is used only at the time of the trial printing or only at the time of the main printing. It may be used to make a register.

Further, in the above-described embodiment, in the case of shifting to the main printing during the registration during the trial printing and performing the registration left unfinished during the trial printing, as shown in FIG. 7, it is oblique. After the correction of the image direction is completed, the correction of the top-bottom direction is performed, and after the correction of the top-bottom direction is completed, the correction of the left-right direction is performed. In addition, after performing the first correction in the oblique image direction, the first correction in the top-bottom direction is performed, and when the first correction in the top-bottom direction is completed, the first correction in the left-right direction is performed. May be good.

Further, in the above-described embodiment, the registration correction is performed in the order of the oblique image direction, the top-bottom direction, and the left-right direction, but the order of the registration correction is not limited to this. For example, it may be performed in the order of the left-right direction, the top-bottom direction, and the oblique image direction.

Further, in the above-described embodiment, the displacement amounts for the oblique image direction, the left-right direction, and the top-bottom direction in the displacement amount are calculated, and the calculated displacement amount in each direction is divided into a plurality of times to move the plate cylinder. However, the misalignment amount is divided in a state where all three directions of the oblique image component, the left-right component, and the top-bottom component are included, and the plate cylinder is included in all three directions based on the divided misalignment amount. You may move to. After moving the plate cylinder, the machine rotation causes the plate cylinder to move again every predetermined rotation.

1 ... Printing machine, 2 ... Paper stacking table, 3 ... Feeder device, 4 ... Feeding unit, 5 ... Printing unit, 5A, 5B, 5C, 5D, 5E ... Printing unit, 6 ... RGB camera, 7 ... Paper ejection unit , 9 ... Box, 10 ... Step, 11 ... Side wall, 12 ... Button, 13 ... Amount acquisition means, 15 ... Plate cylinder moving means, 17 ... Reference register mark, 19 ... Printing paper, 51 ... Plate cylinder, 52 ... Rubber Body, 53 ... impression cylinder, 54, 55 ... transfer cylinder, S ... control unit, W ... transport direction

Claims (4)

A plurality of printing units for printing a plurality of different colors including a reference color on a printing object are provided, and each of the plurality of printing units is provided with a plate cylinder, and the plurality of printing units print on the printing object. A misalignment amount acquisition means for acquiring the misalignment amount of the printed image of another color with respect to the printed image of the reference color, and the plurality of plate cylinders for eliminating the misalignment amount acquired by the misalignment amount acquisition means. In a registering system in a printing machine equipped with a plate cylinder moving means for moving a plate cylinder of a color that is misaligned among
The plate cylinder moving means moves the plate cylinder so that the movement of the printed image for eliminating the misalignment amount is divided into a plurality of movements with a movement amount smaller than the misalignment amount. A featured registering system for printing presses. The plate cylinder moving means controls to move the tip of the plate cylinder based on the small movement amount, and then to move the plate cylinder next based on the small movement amount after a predetermined time has elapsed. The registration system in the printing machine according to claim 1, wherein the registration system is a means. In the registration method in a printing machine that registers the plate cylinders by using a printing machine having a plurality of printing units having a plate cylinders for printing a plurality of different colors including a reference color on a printing object.
A misalignment amount acquisition step for acquiring a misalignment amount of a print image of another color with respect to a print image of a reference color printed on a print target by the plurality of printing units, and a misalignment amount acquisition step acquired by the misalignment amount acquisition step. A plate cylinder moving step for moving a plate cylinder of a color that is misaligned among the plurality of plate cylinders in order to eliminate the amount is provided.
In the plate cylinder moving step, the plate cylinder is moved so that the movement of the printed image for eliminating the misalignment amount is divided into a plurality of movements with a movement amount smaller than the misalignment amount. A characteristic registration method in a printing machine. A plurality of printing units for printing a plurality of different colors including a reference color on a printing object are provided, and each of the plurality of printing units is provided with a plate cylinder, and the plurality of printing units print on the printing object. A misalignment amount acquisition means for acquiring the misalignment amount of the printed image of another color with respect to the printed image of the reference color, and the plurality of plate cylinders for eliminating the misalignment amount acquired by the misalignment amount acquisition means. In a registering system in a printing machine equipped with a plate cylinder moving means for moving a plate cylinder of a color that is misaligned among
A registering program for a printing press for automatically performing a process of registering by moving a plate cylinder of a color that is misaligned by the plate cylinder moving means using a computer.
A control unit that controls the computer to move the plate cylinder in order to divide the movement of the printed image for eliminating the misalignment amount into a plurality of movements with a movement amount smaller than the misalignment amount. A registering program in a printing press to function as.

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