JP5601813B2 - Intermittent press - Google Patents

Description

  The present invention is an intermittent printing machine that performs intermittent printing by intermittently running paper on a printing line using a plurality of printing units, and automatically registers the vertical and horizontal directions of a pattern printed by each printing unit. The present invention relates to an intermittent printing machine that can be adapted to the above.

  In the intermittent printing machine, when aligning the printing register with the intermittently fed printing line, the printing error is read by the sensor for each picture and the printing position is controlled by controlling the movement of each printing unit in the paper running direction according to the detection signal. I try to control it. The control of the printing position is performed while the printing plate of each printing unit is not in contact with the printing paper (Patent Document 1).

Japanese Patent Laid-Open No. 62-201248

  As described above, the printing registration of this kind of intermittent printing machine is performed while the intermittently fed paper is stopped. However, as the printing speed increases, the printing plate is not printed. The contact time is short, for example, the non-contact time at 200 shots / minute is 0.2 seconds. If a large movement amount corresponding to the registration amount is set during this period, the impact caused by the movement and stop of the heavy printing unit The vibration will be large and will adversely affect the printing press and printing accuracy.

  In the above-described conventional devices, the printing unit is moved by a rack and pinion gear, or hydraulically or by a conveyor system. Both of them are powerful brakes for locking the moving direction of the printing unit. Means are required, and responsiveness of brake lock and release in a high-speed movement range becomes a problem.

  Furthermore, in the above-mentioned conventional one, a sensor is installed for each printing unit, and the cost for following the register mark printed by each printing unit is high, and each time the top / bottom size of the printed picture is changed Therefore, it is necessary to adjust the reading position accurately, and it takes an adjustment time. If the reading position is deviated, an error occurs in correction.

  Furthermore, in the above-mentioned conventional apparatus, the left and right registration cannot be performed, and it is not possible to deal with a registration defect in the width direction of the paper.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an intermittent printing machine that can automatically and accurately perform printing registration in a vertical direction and a horizontal direction on a printing line of an intermittent printing machine. Is intended to provide.

In order to achieve the above object, an intermittent printing machine according to the present invention of claim 1 includes a plurality of printing cylinders each having a printing cylinder having a large-diameter portion with a printing plate attached in the circumferential direction and an impression cylinder that is in rolling contact with the printing plate. In the intermittent printing machine in which the printing unit is arranged in the traveling direction of the paper that is intermittently fed,
Each printing unit can be moved in the vertical direction by the unit moving motor, and the printing cylinder of each printing unit can be moved in the axial direction by the sidelay motor.
Read the registration mark for each picture printed by each printing unit on the downstream side of the printing unit on the most downstream side in the paper running direction, and the top and bottom of the registration mark of the other printing unit with respect to the registration mark of the reference printing unit A CCD camera that detects the amount of misregistration in the direction and the amount of misregistration in the horizontal direction
In response to the registration amount signal from the CCD camera, the registration correction signal in the vertical direction with respect to the reference registration mark is applied to the unit moving motor of each printing unit, and the small diameter portion of the printing cylinder is opposed to the impression cylinder. A controller that outputs the amount of misregistration correction in the horizontal direction to the sidelay motor of each printing unit ,
When the maximum vertical correction amount signal of the vertical direction by this controller is set, and the actual vertical direction correction amount signal exceeds this setting value , the set maximum registration correction amount signal and (the actual registration correction amount The remaining register correction amount signal of the value of signal-set maximum register correction amount signal) is divided and output to the unit moving motor.
This controller has a configuration in which the left-right registration correction amount signal is output to the side-lay motor at any time.

  According to a second aspect of the present invention, in the above intermittent printing machine, each printing unit is screwed to a screw shaft provided on the frame in the vertical direction, and a unit moving motor is connected to the screw shaft.

  According to a third aspect of the present invention, in the intermittent printing press according to the first or second aspect, the limit amount of one registration correction amount signal in the vertical direction by the controller can be changed.

  According to the first aspect of the present invention, it is possible to register a plurality of intermittently printed patterns in both the vertical direction and the horizontal direction. Since the registration mark registration of each pattern can be recognized by a single CCD camera, the cost is lower than the conventional technology in which a sensor is provided for each printing unit. Therefore, it is not necessary to align the position of each sensor, and the work efficiency of the registration work can be improved.

  Further, particularly in the present invention, when the amount of movement of the printing unit is limited to one time when registering in the vertical direction in each printing unit, and the amount of correction for registration exceeds the amount of movement of this limit. Since the vertical movement of the printing unit can be divided into a plurality of times, the movement distance of the printing unit by registration can be shortened, and the printing unit can be moved by registration during high-speed printing. Impact due to stopping can be reduced.

  According to the second aspect of the present invention, since the printing unit can be moved in the vertical direction by means of the screw shaft, the structure can be simplified as compared with those using a pinion gear and a rack or hydraulically. In addition, it is possible to obtain a high-speed tracking capability when moving and stopping without the need for a powerful braking device that repeats ON and OFF due to the fixing action by screws.

  According to the third aspect of the present invention, the amount of movement of each printing unit at the time of top-to-bottom adjustment is adjusted according to the traveling speed of the paper by changing the maximum amount of movement of the printing unit at one time. be able to.

It is a schematic structure explanatory view of an intermittent printing machine concerning the present invention. 2 is a schematic configuration explanatory diagram of a printing unit. FIG. It is a perspective view which shows the moving mechanism of a printing unit roughly. It is a top view which shows the paper which printed the register mark with the printing pattern. It is explanatory drawing which shows the shift | offset | difference state of the registration mark of each pattern. It is a register control flowchart which shows control of registration. It is a register control flowchart which shows the specific example of control in a CCD camera part.

  FIG. 1 shows an example of an intermittent printing machine to which the present invention is applied. In FIG. 1, 1 is a paper feeding unit, 2 is a plurality of colors, for example, black B, yellow Y, magenta M, and cyan C. The printing unit includes first to fourth printing units 2 a, 2 b, 2 c, and 2 d for printing. The paper 3 from the paper feeding unit 1 is fed to the printing unit 2 on the upstream side and the downstream side of the printing unit 2. Intermittent feeding devices 4a and 4b for intermittent running are provided. Loop portions 5a and 5b for absorbing slack of the sheet 3 intermittently fed to the upstream side of the upstream intermittent feeding device 4a and the downstream side of the downstream intermittent feeding device 4b are provided. Each of the intermittent feeding devices 4a and 4b is driven by a single drive motor such as a sectional motor that can be individually controlled for rotation.

  Each of the printing units 2a to 2d is an offset type having the same configuration, and is composed of a plate cylinder 6, a blanket cylinder 7 and an impression cylinder 8 which are in contact with each other and rotate in opposite directions. The roll of equipment is rolling. Each of the printing units 2a to 2d is driven by a single motor that can be rotationally controlled in the same manner as the intermittent feeding devices 4a and 4b.

  Each cylinder configuration of each of the printing units 2a to 2d is as shown in FIG. 2, and a large-diameter portion to which a blanket 7a having a circumference shorter than the entire circumference is fixed to the circumferential surface of the blanket cylinder 7. The blanket 7a is in rolling contact with the impression cylinder 8 to form a nip portion, and the small diameter portion without the blanket 7a is a nip release portion that does not contact the impression cylinder 8. A state where the rotational phase of the blanket cylinder 7 is in the nip releasing portion is a registration misalignment correctionable region in which the registration misalignment of the printing unit can be corrected. On the peripheral surface of the plate cylinder 6, a printing plate that is in rolling contact with the blanket of the blanket cylinder 7 is attached. The impression cylinder 8 may also be provided with a small-diameter portion for releasing the nip with respect to the blanket cylinder 7.

  Each of the printing units 2a to 2d described above is placed on the base 9 in FIG. 1 so as to be movable in the traveling (upside down) direction of the paper 3. FIG. 3 shows the moving means of the printing units 2a to 2d. The frame 10 of each unit is screwed to a screw shaft 11 provided in the vertical direction of the base 9. The screw shaft 11 is rotated by the unit moving motors 14a, 14b, 14c, and 14d of the printing units 2a to 2d via the bevel gear mechanism 12 and the drive shaft 13, so that the frame 10 moves in the vertical direction. It has become. The frame 10 is provided with a linear guide 16 that engages with a rail 15 provided on the base 9, and the linear guide 16 slides on the rail 15 so that the printing units 2a to 2d can move with a light force. It has become.

  The plate cylinder 6 of each of the printing units 2a to 2d is slightly movable in the horizontal direction in the axial direction in FIG. 3, and this movement is caused by the sidelay motors 17a, 17b, 17c, and the like of the printing units 2a to 2d. It can be performed at 17d.

  In the intermittent printing machine shown in FIG. 1, for example, as shown in FIG. 4, a pattern 18 printed in four colors B, Y, M, and C is repeatedly printed at equal intervals. At this time, the registration marks B, Y, M, and C by the printing units 2a to 2d are printed on the blank portion of the paper 3 for each picture. The interval between the registration marks is 4 mm, for example.

  In FIG. 1, the first to fourth registration marks B, Y, M, and C printed by the printing units 2a to 2d of the printing unit 2 are monitored in the same visual field on the downstream side of the printing unit 2. A CCD camera 19 is provided.

  The CCD camera 19 reads each of the registration marks B, Y, M, and C, processes the image, and sets second, third, and fourth registration marks for a reference registration mark, for example, the first top and bottom mark B. A misregistration in the vertical direction and the horizontal direction of Y, M, and C is detected.

  FIG. 5 shows an example of the registration marks B, Y, M, and C read by the CCD camera 19. In this case, the positions d2, d3, and d4 of the other registration marks Y, M, and C with respect to the first registration mark B serving as a reference are, for example, d2 = 4.27 mm, d3 = 7.7 mm, When d4 = 12.1 mm and the horizontal displacements h2, h3, and h4 are h2 = (+) 0.1 mm, h3 = (−) 0.3 mm, and h4 = 0, the interval between the registration marks Is 4 mm as described above, in the CCD camera 19, the second registration mark Y is Δd2 = 0.27 mm in the vertical direction with respect to the first registration mark B, and h2 = (+) in the width direction. Similarly, the third register mark M is detected as Δd3 = (−) 0.3 mm, h3 = (−) 0.3 mm, and the fourth register mark C is expressed as Δd4. = (+) 0.1 mm and h4 = 0 are read. The read values are sequentially input to the controller 20.

  The controller 20 sequentially processes the vertical and horizontal shift amounts of the registration marks Y, M, and C sequentially input from the CCD camera 19 to unit transfer motors 14b, 14c, and 14d of each printing unit and the side. Pulse signals corresponding to the displacements (Δd2, h2), (Δd3, h3), (Δd4, h4) are sent to the lay motors 17b, 17c, 17d, and each printing unit is moved in the vertical direction. The unit moving motors 14d, 14c, and 14d are driven so that the misregistration moves in the direction of zero, and the plate cylinders of the printing units move in directions in which the left and right registration errors become zero. As described above, the sideley motors 17b, 17c, and 17d are driven. The correction of the registration shift in the vertical direction at this time is performed in a registration correction correcting region where the small diameter portion of the blanket cylinder 7 faces the impression cylinder 8 in a non-nip state. It should be noted that the correction of the shift amount in the left direction can be performed not only in the non-nip state between the plate cylinder 7 and the impression cylinder 8 but always.

  At this time, the maximum correction amount for each registration deviation amount Δd2, Δd3, Δd4 in the vertical direction is limited, and the correction amount for one correction in the vertical direction is, for example, 0.1 mm. Limited. For this reason, when Δd2 which is 0.27 mm is corrected, it is corrected by dividing into three times of 0.1 mm, 0.1 mm and 0.07 mm. The maximum amount of correction at one time can be changed by the controller 20.

  FIGS. 6 and 7 schematically show a registration control flow for correcting the above-described registration deviation amount. The following is a flowchart for a black pattern printed by the first printing unit 2a based on this figure. A flow for correcting the vertical and horizontal misalignments of the yellow Y, magenta M, and cyan C images printed by the other second, third, and fourth printing units 2b, 2c, and 2d will be described.

  FIG. 6 shows the overall registration correction flow. In this figure, after the registration correction start step (1), another registration mark Y, Y, for the first registration mark B in the registration position registration step (2) is shown. The positions d2, d3, d4 in the vertical direction of M and C and the positions h2, h3, h4 in the left-right direction are registered. At this time, in FIG. 5, it is assumed that d2 = 4 mm, d3 = 8 mm, d4 = 12 mm, and h2, h3, and h4 are zero. Next, the reference signal of the printing speed of each of the printing units 2a to 2d and the printing length signal of one pattern are confirmed in step (3).

  In this state, in step (4) of the CCD camera 19, the positions of the registration marks B, Y, M, and C are read in the same field of view, and in step (5), the first registration mark B serving as a reference is read. Then, it is determined whether the other registration marks Y, M, and C are misaligned in the vertical direction and the horizontal direction. This determination is made for each of the registration marks Y, M, and C. If there is a registration deviation, the amount of registration mark misregistration with respect to the first registration mark B is measured in step (6), and the amount of registration misalignment in the vertical direction and the left-right direction in step (7). calculate. This calculation is performed for each of the registration marks Y, M, and C, and the deviation amounts (Δd2, h2), (Δdd, h3), and (Δd4, h4) of each registration mark are sequentially performed. It is converted into a pulse and input to the controller 20.

  In the controller 20 to which the signals of the respective misregistration amounts are input from the CCD camera 19, the register correction possible regions in the respective printing units 2b to 2d are determined in step (8), and the respective misregistration amounts are to be corrected. It is determined whether the blanket cylinder 7 of each printing unit is in the non-contact area of the paper. This determination is made by monitoring the number of pulses of the encoder that detects the paper in the blanket cylinder 7.

  For example, if one rotation of the blanket cylinder 7 is 3000 pulses, and the sheet non-contact area covers a range of 500 pulses between 1800 pulses and 2300 pulses, this 500 pulses becomes a register correcting area, which is 1 In the case of 200 shots per minute, the time is 0.2 seconds, which means that the above-mentioned registration amounts Δd2, Δd3, Δd4 in the vertical direction can be corrected within 0.2 seconds.

  The controller 20 has a register correction signal division output step (9) for dividing the registration correction signals for the registration amounts Δd2, Δd3, and Δd4 in the vertical direction from the CCD camera 19. In this step (9), the one-time magnitude of the registration correction amount signal in the vertical direction output in this step (9) is limited, and the correction amount for correcting the above-mentioned misregistration does not satisfy this limitation. If it exceeds the limit, it is divided into multiple pieces within this limit and output repeatedly.

  The division correction signals are output to the unit moving motors 14b, 14c, 14d of the printing units 2b, 2c, 2d. The correction signal for the registration in the vertical direction at this time is input to each of the unit moving motors 14b, 14c, and 14d for each registration correction possible region of each printing unit. The correction signal in the left-right direction is input to the side correction motors 17b, 17c, and 17d over the register correction possible region or at any time.

In each of the printing units 2b, 2c, and 2d, the distance in the vertical direction corresponding to the amount of registration in the vertical direction is moved a plurality of times, and the deviation in the vertical direction is divided and corrected. Further, modification signals in the lateral direction misregister corresponding to the left and right misregister amount, the printing units 2b, 2c, each side rail motor 17b of 2d, 17c, are input to 17d, a plate cylinder by the respective motors 6 is moved in the axial direction, and this misalignment in the left-right direction is corrected.

  The registration correction is performed sequentially over the second, third, and fourth printing units 2b, 2c, and 2d with respect to the registration mark B printed by the first printing unit 2a serving as a reference. The correction is confirmed at step 10. After confirming this, the process returns to reading the register position by the CCD camera 19.

  A specific example of steps (5), (6), and (7) in the CCD camera 19 will be described with reference to the registration control flowchart of FIG.

  First, in step (4), the vertical and horizontal registration positions d2 = 4.27 mm and h2 = + 0.1 mm of the second registration mark Y with respect to the first registration mark B are read. Next, in step (5), it is determined whether or not there is a registration shift in the vertical direction and the horizontal direction of the second registration mark Y with respect to the first registration mark B.

  If it is determined in step (5) that there is a registration error, the registration error in the vertical direction is Δd2 = 0.27 mm in step (6-1) within the registration error measurement in step (6). In step (6-2), the vertical registration amount Δd2 = 0.27 mm corresponding to the amount of deviation is output. When it is confirmed in step (6-3) that the output of the correction amount for the top and bottom register deviation amount is completed, the top and bottom direction movement amount (0.27 mm) by the top and bottom register correction signal is converted into a pulse in step (7). Converted and input to the controller 20.

  When it is confirmed in step (6-3) that the output of the correction amount of the top / bottom shift amount has been completed and the movement amount signal has been output to step (7), the steps (6-1) to (6) -4) reads that the amount of misregistration in the left-right direction is Δh2 = + 0.1 mm, and outputs the amount of misregistration Δh2 = + 0.1 mm in step (6-5). In step (6-6), when it is confirmed that the left / right registration amount correction amount output has been completed, the left / right movement amount (+0.1 mm) by the left / right registration correction signal is converted into a pulse in step 7. Input to the controller 20.

  When the registration amount correction amount output of the second registration mark Y is completed in the step (6-6) as described above, the registration amount correction amount of the third registration mark M is calculated, and this is calculated. It repeats sequentially until the third register mark C.

  When 0.27 mm of the vertical registration amount Δd2 of the second registration mark Y is input to the controller 20, in step (9), the magnitude of the maximum registration correction amount signal is set to 0.1 mm. If it is set, the first correction signal from step (9) is 3 mm of 0.1 mm, 0.1 mm, and 0.07 mm in each registration misalignment correction possible region of the printing unit 26. The output is output to the unit moving motor 14b, and the amount of deviation 0.27mm in the vertical direction of the second printing unit 2b is corrected in three times of 0.1 mm, 0.1 mm, and 0.07 mm.

  After the registration in the vertical direction is corrected, a correction signal of the registration amount in the horizontal direction of the second printing unit 2b + 0.1 mm is output from the controller 20 to the sidelay motor 17b, and the plate cylinder 6 is moved. The registration in the left-right direction is corrected by moving +0.1 mm in the axial direction.

  In the same manner as described above, the registration in the vertical direction and the horizontal direction of the third and fourth printing units 2c and 2d is corrected.

  DESCRIPTION OF SYMBOLS 1 ... Paper feed part, 2 ... Printing part, 2a, 2b, 2c, 2d ... Printing unit, 3 ... Paper, 4a, 4b ... Intermittent feeding device, 5a, 5b ... Loop part, 6 ... Plate cylinder, 7 ... Blanket cylinder , 7a ... Blanket, 8 ... Impression cylinder, 9 ... Base, 10 ... Frame, 11 ... Screw shaft, 12 ... Bevel gear mechanism, 13 ... Drive shaft, 14a, 14b, 14c, 14d ... Unit moving motor, 15 ... Rail , 16 ... Linear guide, 17a, 17b, 17c, 17d ... Side-lay motor, 18 ... Picture, 19 ... CCD camera, 20 ... Controller.

Claims (3)

In an intermittent printing machine comprising a printing cylinder having a large-diameter portion with a printing plate attached in the circumferential direction and a plurality of printing units consisting of a pressure cylinder that is in rolling contact with the printing plate arranged in the traveling direction of the paper that is intermittently fed,
Each printing unit can be moved in the vertical direction by the unit moving motor, and the printing cylinder of each printing unit can be moved in the axial direction by the sidelay motor.
Read the registration mark for each picture printed by each printing unit on the downstream side of the printing unit on the most downstream side in the paper running direction, and the top and bottom of the registration mark of the other printing unit with respect to the registration mark of the reference printing unit A CCD camera that detects the amount of misregistration in the direction and the amount of misregistration in the horizontal direction
In response to the registration amount signal from the CCD camera, the registration correction signal in the vertical direction with respect to the reference registration mark is applied to the unit moving motor of each printing unit, and the small diameter portion of the printing cylinder is opposed to the impression cylinder. A controller that outputs the amount of misregistration correction in the horizontal direction to the sidelay motor of each printing unit ,
When the maximum vertical correction amount signal of the vertical direction by this controller is set, and the actual vertical direction correction amount signal exceeds this setting value , the set maximum registration correction amount signal and (the actual registration correction amount The remaining register correction amount signal of the value of signal-set maximum register correction amount signal) is divided and output to the unit moving motor.
The horizontal misregistration correction amount signal by this controller is output to the sidelay motor at any time.
An intermittent printing machine characterized by that.
The intermittent printing machine according to claim 1, wherein each printing unit is screwed onto a screw shaft provided on the frame in a vertical direction, and a unit moving motor is connected to the screw shaft. The intermittent printing machine according to any one of claims 1 and 2, wherein the controller can change a limit amount of one registration correction amount signal in the vertical direction.

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