JP4276463B2 - Reprinting apparatus and reprinting method for rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reprinting apparatus and a reprinting method for a rotary printing press for performing additional printing on a substrate (web) on which a pattern has already been printed.
[0002]
[Background]
Conventionally, in gravure printing or the like, there is a case where so-called reprint (overprint) printing is performed, in which additional printing is performed on a web on which a pattern has already been printed (pre-printed).
For example, in the case where prints having the same pattern and only partially different prints such as a store name, a manufacturer name, and a weighing for manufacturing are required, additional printing (overprinting) is performed. In this case, printing excluding different character portions and the like is collected in advance, and the total amount is completed, and if necessary, the plate cylinder in which only the different portions are made is used, and the additional printing is performed again on the printing press.
[0003]
By the way, in gravure printing for packaging, a stretchable film is often used as a web. When an easily stretchable film is used as the web, a rotary printing machine such as gravure printing prints the web while applying tension to the web, so the printing pitch for pre-printing matches the printing pitch for reprinting. It is difficult.
In other words, even if almost the same tension can be applied to the film in the first printing and the additional printing, it is difficult to completely reproduce the stretched state of the web that has already been printed and dried by the additional printing. Further, since a manufacturing error of the plate cylinder circumference for reprinting occurs, it is difficult to match the preprinted printing pitch with the reprinting printing pitch in a stretched state.
[0004]
Conventionally, a registration operation for aligning a registration mark at the time of reprinting with a registration mark of a preprinted web is first provided on the side for supplying the web to the printing unit that performs overprinting and the side for winding the web. In addition, coarse adjustment is performed by adjusting the tension of the infeed portion and the outfeed portion, and fine adjustment is performed by moving a register correction roller provided on the upstream side of the web path with respect to the plate cylinder to increase or decrease the web path length. (For example, patent document 1).
[0005]
[Patent Document 1]
JP 2000-117950 A
[0006]
[Problems to be solved by the invention]
Since the registration work by moving the registration correction roller continuously corrects the printed pattern in which the web stretch is slightly negative or slightly positive, It will move gradually only in the direction (positive direction or negative direction). Eventually, when the registration correction roller reaches the stroke end, for the subsequent correction of the misregistration, the registration correction roller has deviated from the movement range, so that an uncorrectable situation is likely to occur.
[0007]
In order to avoid such a situation, in the initial adjustment, tension adjustment (coarse adjustment) is performed so that the movement range of the registration correction roller does not deviate from the fine adjustment range during continuous operation. However, it is extremely difficult to adjust the tension during the coarse adjustment, and it takes a lot of time.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a reprint apparatus for a rotary printing press that allows stable reprint printing to be continued without imposing a great load on the operator and without causing the print registration correction roller to be out of the range of registration correction. And providing a reprint method.
[0009]
[Means for Solving the Problems]
  The follow-up printing apparatus for a rotary printing press according to the present invention supplies at least one printing unit having a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, and supplies a web to the printing unit. A web feeding mechanism, a web winding mechanism for winding the web, and a web feeding roller provided between the printing unit, the web feeding mechanism and the web winding mechanism, and feeding the web across the web. In a reprinting device of a rotary printing press that performs additional printing (reprinting printing) on a printed (preprinted printing) web, the web path length provided on the upstream side of the web path with respect to the plate cylinder A register correction roller that can be moved to increase or decrease the length, a registration mark corresponding to a preprinted pattern provided downstream of the web cylinder with respect to the plate cylinder, and a reprint A registration mark detection sensor that detects a registration mark corresponding to a picture, and a detection signal from the registration mark detection sensor determines the distance between the two registration marks, and calculates a deviation amount when a registration deviation is detected between the registration marks. An automatic registration correction device that moves the registration correction roller to correct the printing, a printing length measuring unit that measures a printing length from the start of the reprint printing of the web to a predetermined length printing, and the printing length Registration correction roller position detection means for detecting the position of the registration correction roller at the start of follow-up printing measured by the measurement means and printing at a predetermined length, and tracking of the registration correction roller detected by the registration correction roller position detection means. From the positional information of the registration correction roller at the start of printing and printing at a predetermined length,Register correction rollerTo be within the standard register correction rangeAboveAnd an integrated control unit that obtains the peripheral speed of the web feed roller and changes the peripheral speed of the web feed roller so as to obtain the obtained value.
[0010]
  According to this configuration, from the length printed during the follow-up printing period and the registration correction roller position information that the registration correction roller has moved within that period,Register correction rollerSince the peripheral speed of the web feed roller is calculated so that the value is within the reference register correction range, and the peripheral speed of the web feed roller is automatically changed so that the calculated value becomes the calculated value, the register correction roller moves from the reference register correction range. It will not come off. For this reason, it is possible to continue stable reprint printing without imposing a great load on the operator.
[0011]
In the present invention described above, printing units having the same configuration as the printing unit are disposed on the upstream side and the downstream side of the web of the printing unit, and the plate cylinders and pressures of the upstream and downstream printing units are arranged. It is desirable that the cylinder constitutes the web feed roller that feeds the web across the web.
According to this configuration, in a printing machine that includes a plurality of printing units and can perform multicolor printing, when one printing unit is used for reprint printing, the upstream and downstream printing units of the printing unit flow are used. Since the plate cylinder and the impression cylinder can be used as a feed roller that feeds the web between them, it is not necessary to provide a new feed roller. As a result, the parts can be shared and the number of members can be reduced.
[0012]
Further, it is desirable that the registration mark detection sensor also serves as the printing length measuring unit.
According to this configuration, the register mark detection sensor detects a register mark corresponding to a preprinted pattern and a register mark corresponding to a reprinted pattern, and at the time of printing a predetermined length from the start of the web reprint printing. The printing length up to can be measured, so that the parts can be shared, the number of parts can be reduced, the installation work can be reduced, and the cost can be reduced.
[0013]
  In the follow-up printing method of the rotary printing press according to the present invention, at least one printing unit having a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, and a web is supplied to the printing unit. A rotary printing press comprising a web supply mechanism, a web take-up mechanism for winding the web, and a web feed roller that is provided between the printing unit, the web supply mechanism, and the web take-up mechanism and feeds the web across the web. A reprinting method of a rotary printing machine for performing additional printing (reprinting printing) on a web on which a pattern has already been printed (pre-printing printing) by the reprinting apparatus, wherein the web is applied to the plate cylinder. The web path length is increased or decreased by movement of a registration correction roller provided on the upstream side of the path, and a registration mark detection sensor provided on the downstream side of the web path with respect to the plate cylinder. The registration mark corresponding to the preprinted pattern and the registration mark corresponding to the overprinted pattern are detected by the above-mentioned, and the interval between the registration marks is determined by the detection signal from the registration mark detection sensor. When the misalignment is detected, an automatic register correcting device moves the register correcting roller to calculate and correct the misalignment amount, and the printing length from the start of the web reprint printing to the predetermined length printing is printed length. The registration correction roller position detection means detects the position of the registration correction roller at the start of reprint printing and the predetermined length printing measured by the measurement means, and the registration correction roller position detection. From the positional information of the registration correction roller at the start of follow-up printing of the registration correction roller detected by the means and printing at a predetermined length, By coupling the control unit, theRegister correction rollerTo be within the standard register correction rangeAboveWhile calculating | requiring the circumferential speed of a web feed roller, the circumferential speed of the said web feed roller is changed so that it may become the calculated | required value.
[0014]
  According to this configuration, from the length printed during the follow-up printing period and the registration correction roller position information that the registration correction roller has moved within that period,Register correction rollerSince the peripheral speed of the web feed roller is obtained so that the value falls within the reference registration correction range, and the peripheral speed of the web feed roller is automatically changed so as to obtain the calculated value, the registration correction roller is out of the registration correction range. There is nothing. For this reason, it is possible to continue stable reprint printing without imposing a great load on the operator.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a one-color gravure rotary printing press 1 to which a follow-up printing apparatus according to the present invention is applied. The gravure rotary printing machine 1 includes one printing unit 2₁And printing unit 2₁, An unwinding unit 3 and an infeed unit 4 as a web supply mechanism disposed on the upstream side (left side in FIG. 1), and a printing unit 2₁Are provided with an outfeed section 5 and a winding section 6 as a web winding mechanism disposed on the downstream side (right side in FIG. 1).
Printing unit 2₁Between the web supply mechanism and the web winding mechanism, that is, the printing unit 2₁And the infeed unit 4 and the printing unit 2₁And web feed rollers 13, 14 are provided between the web feed roller 5 and the outfeed unit 5.
[0016]
Printing unit 2₁Includes a plate cylinder 7, an impression cylinder 8, and a plurality of rotation-free guide rollers 9 constituting a printing unit, and a plate cylinder driving servo motor 10 that drives the plate cylinder 7.₁Is provided via a transmission gear (not shown).
The web feed rollers 13 and 14 are connected to feed roller driving servo motors 10i and 10o via transmission gears (not shown).
As a result, the printing unit 2₁The plate cylinder 7 and the web feed rollers 13 and 14 can be independently driven.
[0017]
FIG. 2 shows a control system of the gravure rotary printing press 1. The drive control device 20 includes a DSP (digital signal processor) unit 21 that operates as an integrated control unit, a memory unit 22 that stores various data, and a plate cylinder servo controller (control circuit) 23.₁The feed roller servo controllers 23i and 23o, a tension control unit 25, and an input / output I / F (interface) unit 26 are included.
[0018]
The input / output I / F unit 26 includes an input device 27, a display device 28 such as a CRT, and feed roller ratio setting devices 29i and 29o as feed roller ratio setting means provided for the feed rollers 13 and 14, respectively. Are connected to each other.
The feed roller ratio setting devices 29i and 29o are installed in the vicinity of the plate cylinder 7 at a place where the registration marks for pre-printing and follow-up printing can be seen. Further, structurally, as shown in FIG. 3, a reprint printing unit 2 for performing reprint printing.₁The ratio of the peripheral speed of each of the web feed rollers 13 and 14 to the peripheral speed of the plate cylinder can be changed by increasing or decreasing the speed.
[0019]
Various data (for example, the printing unit 2) input by the input device 27 are stored in the memory unit 22.₁, And the like, and the diameters of the web feed rollers 13 and 14) are stored.
[0020]
When various data such as a JOB number are input from the input device 27, the DSP unit 21 stores these data in the memory unit 22. Further, when an operation command and a speed command are given from the printing press control device 50, the plate cylinder servo controller 23 of the printing unit that executes printing.₁A position command signal is also given to the feed roller servo controllers 23i and 23o.
[0021]
In addition, the DSP unit 21 maintains a time interval according to the speed command during constant speed operation, and continuously sends position command signals to each servo controller 23.₁, 23i, 23o. At this time, the synchronization of the plate cylinders 7 is maintained by the software synchronization of the DSP unit 21. While accelerating and decelerating, the position command signal is continuously generated while maintaining the rate of change according to the acceleration time and deceleration time due to a predetermined angular acceleration, that is, the synchronization of the plate cylinders 7 by the software synchronization of the DSP unit 21. Maintain sex.
[0022]
Each plate cylinder servo controller 23₁The feed roller servo controllers 23i and 23o are supplied with a speed command signal from the DSP unit 21 as a control target value. In response, the servo amplifier 30₁, 30i, 30o, the drive signal corresponding to the command signal is the servo motor 10₁, 10i, 10o, servo motor 10₁, 10i, 10o are connected to the shaft end 12₁, 12i, 12o, the rotation angle signal is a position feedback signal and the plate cylinder servo controller 23₁And input to the feed roller servo controllers 23i and 23o. Plate cylinder servo controller 23₁The feed roller servo controllers 23i, 23o are provided with a position loop 32 having a fixed cycle (servo system sampling cycle).₁, 32i, 32o, and has a software servo function for controlling each servo system.
[0023]
The tension control unit 25 includes a plate cylinder servo controller 23.₁Are driven synchronously by a tension control command signal from the DSP unit 21 in synchronism with the command signal. That is, the tension control unit 25 outputs a drive signal to the unwinding unit 3, the infeed unit 4, the outfeed unit 5, and the winding unit 6 based on the tension control command signal from the DSP 21, and performs web tension control. .
The printing press controller 50 is connected to a plate cylinder attaching / detaching device 51 that allows the plate cylinder 7 to be attached to and detached from the impression cylinder 8.
[0024]
As shown in FIG. 4, the reprint printing unit 2₁On the upstream side of the web W, a pair of web feed rollers 13 that feed the web W with the web W interposed therebetween are provided.₁Between the plate cylinder 7 and the impression cylinder 8, there are a web feed roller 13 and a printing unit 2.₁A registration correction roller 35 for adjusting the web path length between the plate cylinder 7 and the impression cylinder 8 is provided.
[0025]
The registration correction roller 35 is mounted with the web W that passes through the guide rollers 9 disposed in the front and rear of the registration correction roller 35. The registration correction roller 35 moves in the vertical direction in FIG.₁The web path length between the plate cylinder 7 and the impression cylinder 8 can be changed.
[0026]
A registration correction roller drive motor 36 is connected to the registration correction roller 35, and the registration correction roller 35 is moved within a predetermined range by driving the motor 36. Further, a registration correction roller position detector 37 which is a registration correction roller position detection unit for detecting the movement of the registration correction roller 35 is provided in the vicinity of the registration correction roller 35.
[0027]
Printing unit 2₁A printing register mark sensor 38 for detecting a printing register mark of the web W is provided on the downstream side of the web W of the plate cylinder 7 and the impression cylinder 8. The print registration mark sensor 38 can detect a registration mark of the web W that passes through the guide roller 9 </ b> A immediately adjacent to the plate cylinder 7 and the impression cylinder 8. In addition, when the additional printing is started, the web W detected at the position of the guide roller 9A can be detected, and the length of the web W at the position of the guide roller 9A can be detected when printing proceeds and a predetermined length is printed. One role can be played.
[0028]
The movement of the registration correction roller 35 is adjusted by an automatic registration correction device 45 shown in FIG.
That is, the automatic register correction device 45 performs registration adjustment between pre-printing printing and follow-up printing. The pre-printing printing register mark position detected by the printing register mark sensor 38 and the reprint printing register mark position are detected. When the distance is out of the preset reference range, the registration correction roller drive motor 36 is driven to determine the position of the pre-printing printing registration mark position and the additional printing printing registration mark position. Operates so that the distance is within the reference range.
[0029]
Further, the register mark position information from the print register mark sensor 38 is output to the input / output I / F unit 26 of the drive control device 20.
The automatic registration correction device 45 is connected to a registration adjustment encoder 39 that detects the rotation of the plate cylinder and manages the phase between the registration mark and the plate cylinder, and inputs and displays various information for automatic registration adjustment. An input / display device 40 is connected.
[0030]
In the above configuration, in order to perform reprint printing, the printing unit 2₁In the feed roller ratio setting devices 29i and 29o of the web feed rollers 13 and 14 before and after the reprint printing unit 2₁The ratio of the peripheral speed of the feed rollers 13 and 14 to the peripheral speed of the plate cylinder is set. Then, these ratios are stored in the memory unit 22.
[0031]
After the above preparation, a printed web is attached to the unwinding unit 3 and the printed web is attached to the printing unit 2.₁Through the winding part 6.
Here, after the initial phase adjustment is performed so that the registration marks of the first printing and the additional printing match, printing is started at the adjustment speed (low speed). After the start of printing, when the pre-print registration proceeds with respect to the additional printing, the speed (circumferential speed) of the in-feed portion side web feed roller 13 is decreased. On the contrary, when the pre-printing is delayed with respect to the additional printing, the plate cylinder speed (circumferential speed) of the in-feed portion side web feed roller 13 is increased.
[0032]
After completing these adjustments, the printing speed is increased to the normal operation speed and printing is continued. When the printing speed is increased to the normal operation speed, that is, the printing unit 2₁As the plate cylinder speed (peripheral speed) increases, the ratio set in advance in the feed roller ratio setting devices 29i, 29o, that is, the printing unit 2 is increased.₁The ratio of the peripheral speed of the web feed rollers 13 and 14 to the peripheral speed of the plate cylinder of the printing unit 2₁Since the plate cylinder speed (peripheral speed) and the peripheral speed of the web feed rollers 13 and 14 are changed, the speed is increased to the normal operation speed with a constant tension applied to the web.
In addition, fine adjustment at the time of reprint printing is performed by adjusting the position of the registration correction roller 35 by the automatic registration correction device 45, so that desired registration is maintained.
[0033]
At the start of reprint printing, the change in pitch length is determined by the difference between the plate cylinder circumferential speed of the reprint printing unit and the infeed side feed roller circumferential speed, so pre-printing can be done by adjusting the infeed side feed roller circumferential speed. The adjustment of the print pitch length of the additional printing is performed, and the adjustment of the print pitch length is finished when it is within a predetermined error.
At this time, as described above, the change in the pitch length is performed by detecting when the additional printing of the web W passing through the guide roller 9A and the printing of a predetermined length are detected by the register mark sensor 38.
[0034]
Further, the automatic register correcting device 45 measures the distance between the pre-printed printing register mark and the overprinting printing register mark, and performs register correction.
Here, in the adjustment of the print pitch length at the start of follow-up printing, the preprinted print pitch length is either in the expansion or shortening direction depending on the calculation accuracy, infeed roll circumference, plate cylinder circumference setting error, etc. Change direction.
[0035]
At the time of reprint printing, the change in the print pitch length is determined by the difference between the plate cylinder peripheral speed of the reprint printing unit and the infeed side feed roller peripheral speed. now,
Infeed side feed roller peripheral speed: U
Printing unit cylinder peripheral speed: V
Path length between feed roller and plate cylinder: L
Then, the displacement of the web path length between the feed roller and the plate cylinder caused by the speed difference between the feed roller and the plate cylinder “I”_FP"
I_FP= L ・ (V−U) / V
Thus, the web path length between the feed roller and the plate cylinder changes corresponding to the peripheral speed of the in-feed side feed roller. That is, the pitch length of preprint printing changes.
[0036]
For example, during a period in which the distance between the preprinted printing registration mark and the overprinting printing registration mark indicates a change within a preset reference registration correction range, the automatic registration correction device 45 causes a printing registration error that occurs during overprinting printing. Do not make corrections.
However, if the pitch length of the preprinted printing changes in the extension direction and the distance between the preprinted printing registration mark and the overprinting printing registration mark exceeds the reference registration correction range, the automatic registration correcting device 45 delays the preprinting printing registration mark. In order to move in the direction, a drive signal is output to the registration correction roller drive motor 36, the registration correction roller 35 is moved in the delay direction, and the distance between the preprinted printing registration mark and the overprinting printing registration mark is corrected within a steady deviation. . Then, the distance between the preprinted printing registration mark and the follow-up printing registration mark is within the reference registration correction range.
As described above, the automatic registration correction device 45 corrects the printing registration error that occurs during the follow-up printing.
[0037]
Here, in this embodiment, the position of the registration correction roller 35 is maintained within the registration correction range by changing the circumferential speed of the infeed feed roller. In order to correct the circumferential speed of the infeed feed roller, first, The roller peripheral speed is obtained as follows.
Register correction roller position at the start of reprint printing: P₁
Reprint length: L_L
Registration correction roller position at the end of printing for a predetermined length: P₂
These are stored in the memory unit 22.
[0038]
Then, the movement distance of the register correction roller 35 is set to “L”._C"
L_C＝ K ・ (P₂-P₁)
It becomes.
However, K: Conversion to distance
Therefore, the infeed feed roller circumferential speed to be changed is set to “U_O"
U_O= V · (1-2 · L_C/ L_L)
It becomes. In other words, the infeed feed roller peripheral speed is set to U_OBy doing so, the registration correction roller 35 is always located within the registration correction range without deviating from the registration correction range.
In addition, since an arithmetic error etc. generate | occur | produce as mentioned above, the in-feed feed roller circumferential speed actually changed compensates for it.
[0039]
The operation unit inputs the plate cylinder diameter (or plate cylinder circumference), and the web feed roller diameter (or feed roller circumference etc.) is set in the system in advance. After changing the plate cylinder diameter, start overprinting.
[0040]
According to this embodiment, the following effects can be expected.
(1) From the length printed during the reprint printing period, and the registration correction roller position information when the registration correction roller 35 starts the reprint printing and after printing a predetermined length,Register correction roller 35Therefore, the peripheral speed of the web feed roller 13 is obtained so that it falls within the reference register correction range, and the peripheral speed of the web feed roller 13 is automatically changed so as to obtain the obtained value. Does not deviate from the correction range. For this reason, it is possible to continue stable reprint printing without imposing a great load on the operator.
[0041]
(2) The register mark detection sensor 38 detects a register mark corresponding to the preprinted pattern and a register mark corresponding to the reprinted pattern, and from the start of the additional printing of the web W to the printing of a predetermined length. The printing length can also be measured, so that the parts can be shared, the number of parts can be reduced, the installation work can be reduced, and the cost can be reduced.
[0042]
(3) Since the web feed rollers 13 and 14 are provided with feed roller ratio setting devices 29i and 29o, the printing unit 2₁The ratio of the peripheral speeds of the feed rollers 13 and 14 to the peripheral speed of the plate cylinder can be changed. Then, the DSP unit 21 sets the printing unit 2 at the ratio set by each of the feed roller ratio setting devices 29i and 29o.₁Servo motor 10 for driving the plate cylinder₁Since the feed roller driving servomotors 10i and 10o are driven to rotate, the peripheral speed can be arbitrarily set for each of the web feed rollers 13 and 14.
[0043]
The present invention is not limited to the printing machine described in the above embodiments, and includes the following modifications as long as the object of the present invention can be achieved.
In each of the above embodiments, one printing unit 2₁However, the additional printing may be performed by using two or more printing units. In this case, a feed roller may be provided between a position where a plurality of printing units are sandwiched and between each printing unit.
[0044]
In the above-described embodiment, the rotary printing press 1 includes a single printing unit 2 that performs a reprint printing.₁This printing unit 2 consists of₁Although the web feed rollers 13 and 14 for feeding the web to the infeed 4 side and the outfeed 5 side are provided, the present invention is not limited thereto. A plurality of printing units are provided, for example, one of them is used as a printing unit for reprinting, and the plate cylinder and the impression cylinder in the printing unit before and after the reprinting printing unit are used in place of the web feed roller. It is good also as a rotary printing machine of various composition.
According to this configuration, in a printing machine that includes a plurality of printing units and can perform multicolor printing, when one printing unit is used for reprint printing, the upstream and downstream printing units of the printing unit flow are used. Since the plate cylinder and the impression cylinder can be used as a feed roller that feeds the web between them, it is not necessary to provide a new feed roller. As a result, the parts can be shared and the number of members can be reduced.
[0045]
Further, the tension control unit 25 is not limited to the configuration of the above-described embodiment, and may be any configuration as long as a desired tension can be applied to the web.
Further, the impression cylinder 8 is configured to contact the web W and rotate according to the travel of the web W. However, in the case of a rotary printing machine having a configuration using a plurality of printing units, each printing is performed in the same manner as the plate cylinder 7. Each unit may be driven independently, and these may be synchronously controlled by the DSP 21.
[0046]
The guide roller 9 also has a structure that contacts the web W and rotates according to the travel of the web W. However, the guide roller 9 can also be rotated independently, and the periphery of the plate cylinder 7 and the impression cylinder 8 can be rotated. You may make it synchronize with speed. In this case, the guide roller 9 and the plate cylinder 7 or the guide roller 9 and the impression cylinder 8 may be connected, and the drive source of the plate cylinder 7 or the impression cylinder 8 may be used as the drive source of the guide roller 9.
In the embodiment, the registration correction is performed by moving the registration correction roller 35 in the vertical direction. However, the present invention is not limited to this, and the position is shifted in the horizontal direction between the guide rollers arranged in the vertical direction. A registration correction roller may be arranged, and the registration correction may be performed by adjusting the pitch length by operating the registration correction roller in the horizontal direction.
[0047]
【The invention's effect】
According to the reprint apparatus and reprint method of the rotary printing press of the present invention, stable reprint printing can be performed without imposing a great load on the operator and without causing the print registration correction roller to be out of the range of the registration correction. It is possible to continue.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a gravure rotary printing press according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a control system of the gravure rotary printing press according to the embodiment.
FIG. 3 is a diagram showing a plate cylinder peripheral speed ratio setting device according to the embodiment;
FIG. 4 is a diagram showing an arrangement of a plate cylinder, an impression cylinder, a register correction roller, a web feed roller, and the like according to the embodiment.
FIG. 5 is a diagram showing an automatic register correcting device according to the embodiment.
[Explanation of symbols]
1 Rotary printing press
2₁  Printing unit
3 Unwinding part (web supply mechanism)
4 In-feed section (web supply mechanism)
5 Outfeed (web winding mechanism)
6 Winding part (web winding mechanism)
7 Plate cylinder
8 impression cylinder
9 Guide roller
13, 14 Web feed roller
21 DSP unit (integrated control unit)
35 Register Correction Roller
37 Registration correction roller position detector
38 Register mark sensor (printing length measuring means)
45 Automatic register corrector

Claims (4)

At least one printing unit having a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, a web supply mechanism for supplying a web to the printing unit, and a web winding for winding the web A web feed roller provided between the take-up mechanism, the printing unit, the web supply mechanism, and the web take-up mechanism, and feeding the web across the web, and the web on which an image has already been printed (pre-printed) Furthermore, in the reprinting device of a rotary printing press that performs additional printing (reprinting printing),
A registration correction roller provided upstream of the web path with respect to the plate cylinder and movable to increase or decrease the web path length;
A registration mark detection sensor for detecting a registration mark corresponding to a preprinted pattern provided on the downstream side of the web path with respect to the plate cylinder and a registration mark corresponding to a reprinted pattern;
An automatic registration correction device that moves the registration correction roller to determine the interval between the registration marks based on a detection signal from the registration mark detection sensor and to calculate and correct the amount of deviation when the registration deviation is detected between the registration marks. When,
A printing length measuring means for measuring a printing length from the start of reprint printing of the web to a predetermined length printing;
Registration correction roller position detection means for detecting the position of the registration correction roller at the start of follow-up printing measured by the printing length measurement means and at a predetermined length printing;
From the positional information of the registration correction roller at the start of follow-up printing of the registration correction roller detected by the registration correction roller position detection means and at the time of printing at a predetermined length, the registration correction roller is set within the reference registration correction range. A reprinting apparatus for a rotary printing press, comprising: an integrated control unit that obtains the peripheral speed of the web feed roller and changes the peripheral speed of the web feed roller so as to obtain the obtained value. In the reprint apparatus of the rotary printing press according to claim 1,
On the upstream side and downstream side of the web of the printing unit, a printing unit having the same configuration as the printing unit is disposed,
A reprinting apparatus for a rotary printing press, wherein the plate cylinder and the impression cylinder of the upstream and downstream printing units constitute the web feed roller that feeds the web therebetween. In the follow-up printing apparatus for a rotary printing press according to claim 1 or 2,
The register mark detection sensor also serves as the printing length measuring means, and is a reprinting device for a rotary printing press. At least one printing unit having a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, a web supply mechanism for supplying a web to the printing unit, and a web winding for winding the web The pattern has already been printed by the reprinting device of the rotary printing press provided with the take-up mechanism and the web feeding roller provided between the printing unit, the web supply mechanism, and the web take-up mechanism. A reprinting method for a rotary printing press that performs additional printing (reprinting printing) on a web that has been printed),
The web path length is increased or decreased by movement of a registration correction roller provided on the upstream side of the web path with respect to the plate cylinder,
A registration mark corresponding to a preprinted pattern and a registration mark corresponding to a reprinted pattern are detected by a registration mark detection sensor provided on the downstream side of the web path with respect to the plate cylinder,
The register correction roller is moved by an automatic register correction device in order to calculate and correct the amount of misalignment when the distance between the register marks is detected based on a detection signal from the register mark detection sensor and a misregistration is detected between the register marks. Let
Measure the printing length from the start of reprint printing of the web to the predetermined length printing by the printing length measuring means,
The registration correction roller position detection means detects the position of the registration correction roller at the start of the reprint printing and the predetermined length printing measured by the printing length measurement means,
Based on the positional information of the registration correction roller at the start of follow-up printing of the registration correction roller detected by the registration correction roller position detection means and at the time of printing of a predetermined length, the registration correction roller detects the reference registration correction range by the integrated control unit. wherein together determine the peripheral speed of the web feed roller, obtained overprinting method of a rotary printing machine, characterized in that to change the peripheral speed of the web feed roller to a value to fit within.

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