JP2006212813A - Gravure printing machine and its controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gravure printing machine and its controlling method, in which the registering slur in printing by each printing unit can be converged to a stationary state in its early stage. <P>SOLUTION: The gravure printing machine is equipped with a foregoing stage printing unit 10a, which performs printing at first on a web W, and later stage printing units 10b, 10c and 10d provided on the downstream side of the foregoing stage printing unit 10a. In addition, the gravure printing machine has a control unit 30, which sends the magnitude of a registering slur calculated from both the magnitude of the registering slur calculated by a registering slur calculator 31c corresponding to the concerned later stage printing unit 10c and the magnitude of the registering slur sent to a compensator manipulated variable calculator 32b corresponding to a later stage printing unit 10b lying on the upstream side of the later stage printing unit 10c to a compensator manipulated variable calculator 32c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a line shaft type gravure printing machine that performs printing on a continuously conveyed web and a control method thereof, and more particularly, to a line shaft type gravure printer that can quickly converge misregistration of printing to a steady state. The present invention relates to a gravure printing machine and a control method thereof.

  As a gravure printing machine, a plurality of (for example, three) printing units that perform multicolor printing on a web such as film or paper, a drive unit that drives each printing unit, and a control device that controls each printing unit What was provided is known (for example, refer patent document 1). Such a conventional gravure printing machine will be described in detail below.

  A plurality of printing units in a conventional gravure printing machine print a web and attach a registration mark to the web. A registration mark is provided on the downstream side of the printing cylinder to detect a registration mark on the web. Each has a detection sensor and a compensator roller that is provided on the upstream side of the plate cylinder and adjusts the tension of the web sent to the plate cylinder.

  Each plate cylinder of the plurality of printing units is connected to a line shaft of a drive unit, and the line shaft is driven by a drive motor. In this case, the drive motor drives the line shaft to rotate the plate cylinders synchronously.

  The control device has a registration controller that controls each compensator roller based on the registration mark on the web detected by the registration mark detection sensor of each printing unit to adjust its position.

  In a conventional gravure printing machine having such a configuration, first, a continuously conveyed web is sent to a first printing unit, and the web sent to the first printing unit is printed by a plate cylinder. Is done. In this case, the first register mark is attached to the web by the plate cylinder.

Next, the web discharged from the first printing unit is sent to the second printing unit, and printing is performed on the web by the plate cylinder of the second printing unit, and the second registration mark is printed on the web. It is attached to. Then, the first registration mark and the second registration mark on the web are detected by the registration mark detection sensor of the second printing unit. Thereafter, signals of the first registration mark and the second registration mark are sent to the control device, and the compensator roller in the second printing unit is set so that the distance between the two registration marks becomes a predetermined size in the control device. Is calculated.
The control device controls the compensator roller of the second printing unit based on the operation amount of the compensator roller to adjust its position. As a result, a desired tension is applied to the web between the plate cylinder of the first printing unit and the plate cylinder of the second printing unit, and registration is performed.

  Similarly, in the third printing unit, the relative distance between the second registration mark and the third registration mark on the web detected by the registration mark detection sensor of the third printing unit is a predetermined size. The compensator roller of the third printing unit is controlled so that a desired tension is applied to the web between the plate cylinder of the second printing unit and the plate cylinder of the third printing unit. Done.

  As described above, in the conventional gravure printing machine, for each printing unit, the registration mark attached by the printing cylinder of this one printing unit on the web detected by the registration mark detection sensor of one printing unit. And the compensator roller of one printing unit is controlled so that the distance between the printing mark and the register mark attached by the plate cylinder of another printing unit provided on the upstream side of the one printing unit becomes a predetermined size. . As a result, a desired tension is applied to the web between the plate cylinder of one printing unit and the plate cylinder of another printing unit provided on the upstream side of the one printing unit so as to perform printing registration. It has become.

JP 2004-66577 A

When multi-color printing is performed on a web by a plurality of printing units using the above-described gravure printing machine, as described above, the plate cylinder of each printing unit is rotationally driven in synchronization by the line shaft of the drive unit. Therefore, the amount of variation in tension applied to the web between the two plate cylinders by the compensator roller of the printing unit is sequentially stacked as the web passes through each compensator roller as it is sent to the downstream printing unit. .
For example, in the most upstream compensator roller, tension adjustment for registration is not further performed on the web from the upstream side. With this control method, a desired tension can be applied, and the misregistration of printing can be converged to a steady state at an early stage.

  However, especially in the downstream printing unit, fluctuations in tension caused by the compensator roller of other printing units on the upstream side interfere with each other, and it is difficult to perform desired registration for printing misregistration.

  As described above, in the conventional gravure printing press, the compensator roller of each printing unit is controlled independently for each printing unit regardless of the operation status of the other printing units. For this reason, when performing printing registration by the compensator roller of each printing unit, tension fluctuations by the compensator roller of the other printing unit on the upstream side interfere with each other, so that the misregistration of printing can be quickly converged to a steady state. Have difficulty.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a gravure printing machine and a control method thereof capable of quickly converging printing misregistration by each printing unit to a steady state. And

The present invention includes a front printing unit having a plate cylinder that applies printing to a web that is continuously conveyed and attaches a registration mark to the web, and is provided on the downstream side of the front printing unit, and performs printing on the web. And a registration cylinder for attaching a registration mark to the web, and a registration mark detection sensor for detecting a registration mark on the web, provided on the downstream side of the printing cylinder, and provided on the upstream side of the printing cylinder and sent to the printing cylinder A plurality of subsequent printing units each having a compensator roller for registering the web, and a line cylinder connected to the plate cylinder of the preceding printing unit and the plate cylinder of each subsequent printing unit, and rotating the plate cylinders synchronously. And a plate cylinder of one post-printing unit on the web detected by a registration mark detection sensor of the one post-printing unit The size of the registration deviation between the registration mark attached more and the registration mark attached by the plate cylinder of the upstream printing unit provided on the upstream side of one downstream printing unit or another downstream printing unit is calculated. A misregistration calculator, a compensator operation amount calculator that calculates the operation amount of the compensator roller of one post-stage printing unit based on the size of the misregistration, and the operation of the compensator roller sent from the compensator operation amount calculator A control device having a plurality of compensator controllers for controlling the position of the compensator roller of one post-stage printing unit based on the quantity and adjusting the position thereof, and the control device has a misregistration corresponding to one post-print unit. The amount of misregistration calculated by the calculator and the other succeeding stage provided upstream of the one succeeding printing unit. Sending the size of the registration error determined based on both the size of the registration error sent to the compensator operation amount calculator corresponding to the printing unit to the compensator operation amount calculator corresponding to the one subsequent printing unit. Is a gravure printing machine.
According to such a gravure printing machine, when the registration of printing is performed by the compensator roller in the downstream printing unit, the compensator roller of the downstream printing unit in consideration of the registration variation caused by the upstream tension variation. Can be controlled. As a result, misregistration of printing by each printing unit can be quickly converged to a steady state.

In the gravure printing machine of the present invention, the control device sends one post-stage after a preset delay time has passed since the amount of misregistration was sent to the compensator operation amount calculator corresponding to the other post-stage printing unit. The control gain set in advance for the magnitude of the registration error calculated by the registration error calculator corresponding to the printing unit and the magnitude of the registration error already sent to the compensator operation amount calculator of the other subsequent printing unit. It is preferable to add the magnitudes of misregistration obtained by multiplication and send the total magnitude of misregistrations to a compensator operation amount calculator corresponding to one subsequent printing unit.
According to such a gravure printing machine, after a tension is applied to a predetermined portion of the web by the compensator roller of another downstream printing unit on the upstream side, the compensator roller of one downstream printing unit on the downstream side Considering the time (delay time) until tension is applied to the predetermined part of the web, the compensator operation amount calculator corresponding to the one subsequent printing unit is more misregistered according to the actual driving situation. Can send the size of. As a result, misregistration of printing by each printing unit can be converged to a steady state earlier.

The present invention relates to the above-described gravure printing machine control method, wherein the registration mark detected by the registration mark detection sensor of one subsequent-stage printing unit and attached by the plate cylinder of one subsequent-stage printing unit on the web; A step of calculating, by a registration deviation calculator of the control device, a size of a registration deviation between a registration mark attached by a plate cylinder of a preceding printing unit provided on the upstream side of the succeeding printing unit or another succeeding printing unit; A step of calculating an operation amount of the compensator roller of one post-stage printing unit based on the size of the misregistration by a compensator operation amount calculator of the control device, and an operation of the compensator roller sent from the compensator operation amount calculator Based on the quantity, the compensator controller of the control device can control the compensator And adjusting the position thereof, and the amount of misregistration calculated by the misregistration calculator corresponding to one post-stage printing unit, and the other provided upstream of the one post-stage print unit The amount of misregistration obtained based on both the size of the misregistration sent to the compensator operation amount calculator corresponding to the subsequent printing unit is displayed in the compensator operation amount calculator corresponding to one subsequent printing unit. It is the control method of the gravure printing machine characterized by sending.
According to such a control method of the gravure printing machine, when performing registration of printing by the compensator roller in the downstream printing unit, the downstream printing unit is considered in consideration of the registration variation caused by the upstream tension variation. The compensator roller can be controlled. As a result, misregistration of printing by each printing unit can be quickly converged to a steady state.

According to the gravure printing machine and the control method thereof of the present invention, the size of the registration error calculated by the registration error calculator corresponding to the second and subsequent second printing units in the web flow direction, and the one subsequent stage. The size of the misregistration obtained based on both the magnitude of misregistration sent to the compensator operation amount calculator corresponding to the other subsequent-stage printing unit provided on the upstream side of the printing unit is expressed as the second value. It is sent to a compensator operation amount calculator corresponding to one subsequent printing unit thereafter.
For this reason, when performing registration of printing by the compensator roller in the downstream printing unit, it is possible to control the compensator roller of the downstream printing unit in consideration of the registration variation caused by the upstream tension variation. As a result, misregistration of printing by each printing unit can be converged to a steady state at an early stage, and the registration time can be shortened. For this reason, a yield can be improved and production efficiency can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 are diagrams showing an embodiment of a gravure printing machine according to the present invention. Among these, FIG. 1 is a figure which shows the structure of the gravure printing machine of this Embodiment, FIG. 2 is a block diagram which shows the control method by the control apparatus of the gravure printing machine of FIG. 1, FIG. It is explanatory drawing which shows the magnitude | size of the registration shift sent to each compensator operation amount calculator in the control apparatus of FIG. 2 with time.

The gravure printing machine shown in FIG. 1 is provided on the downstream side of the upstream printing unit 10a, which first performs printing on a web W such as a film or paper continuously conveyed in the direction of the arrow, A plurality of, for example, three subsequent printing units 10b, 10c, and 10d, each of which prints a different color on the web W, and a drive unit 20 that drives the preceding printing unit 10a and the subsequent printing units 10b, 10c, and 10d. I have. In this case, the first-stage printing unit 10a is a first-color printing unit, the second-stage printing unit 10b is a second-color printing unit, the second-stage printing unit 10c is a third-color printing unit, and the second-stage printing unit 10d is the fourth color printing unit. Printing unit.
The gravure printing machine also includes a control device 30 that controls the upstream printing unit 10a, the downstream printing units 10b, 10c, and 10d and the drive unit 20.

  The pre-printing unit 10a includes a printing plate cylinder 11a and a pressure cylinder 12a that performs printing while sandwiching the web W between the plate cylinder 11a. Reference numeral 11a designates a first register mark on the web W.

Further, the rear printing units 10b, 10c, and 10d have substantially the same configuration, and the web W is sandwiched between the printing cylinders 11b, 11c, and 11d and the printing cylinders 11b, 11c, and 11d, respectively. And impression cylinders 12b, 12c, and 12d for printing. When printing is performed on the web W, the plate cylinders 11b, 11c, and 11d are provided with second, third, and fourth register marks on the web W, respectively.
The post-stage printing units 10b, 10c, and 10d further have compensator rollers 14b, 14c, and 14d that are provided on the upstream side of the plate cylinders 11b, 11c, and 11d and are movable in the direction of the arrow in FIG. The compensator rollers 14b, 14c, and 14d are configured to adjust the size of the tension applied to the web W sent to the plate cylinders 11b, 11c, and 11d by changing the positions thereof and perform printing registration. Further, the latter-stage printing units 10b, 10c, and 10d are further provided on the downstream side of the plate cylinders 11b, 11c, and 11d, and have registration mark detection sensors 15b, 15c, and 15d that detect the registration marks on the web W, respectively. Yes. Here, the registration mark detection sensor 15b detects the first registration mark and the second registration mark on the web W, and the registration mark detection sensor 15c detects the second registration mark and the third registration mark on the web W. The mark is detected, and the registration mark detection sensor 15d detects the third registration mark and the fourth registration mark on the web W.

  The compensator rollers 14b, 14c, and 14d are driven by the compensator motors 16b, 16c, and 16d connected to the compensator rollers 14b, 14c, and 14d, respectively, and the positions thereof are changed. , 16c, and 16d are controlled by driving signals of operation amounts of the compensator rollers 14b, 14c, and 14d from a register controller 30a of the control device 30 described later.

  The drive unit 20 is connected to the plate cylinder 11a of the front-stage printing unit 10a and the plate cylinders 11b, 11c, and 11d of the rear-stage printing units 10b, 10c, and 10d, and the line shaft 21 is connected to the line shaft 21. And a drive motor 22 for driving the motor. The drive motor 22 drives the line shaft 21 to rotationally drive the plate cylinders 11a, 11b, 11c, and 11d.

The control device 30 includes a register controller 30a connected to the compensator motors 16b, 16c, 16d and the register mark detection sensors 15b, 15c, 15d of the subsequent printing units 10b, 10c, 10d, and a setting device 30b connected to the register controller 30a. And have. The register controller 30a controls the compensator motors 16b, 16c, and 16d based on the register mark signal on the web W detected by the register mark detection sensors 15b, 15c, and 15d. The setting device 30b is composed of, for example, a touch panel, and gives a command to the register controller 30a to set the control content by the register controller 30a. Specifically, the control gain s and the delay time t are set in the setting device 30b as will be described later.
A control method by the control device 30 will be described later.

Next, the operation of the present embodiment having such a configuration will be described.
When the web W is transported to the gravure printing machine shown in FIG. 1, the web W is first sent to the first-stage printing unit 10a for the first color. The web W sent to the pre-stage printing unit 10a is sandwiched between the plate cylinder 11a and the impression cylinder 12a to be printed in the first color. At this time, a first register mark is attached to the web W by the plate cylinder 11a.

  The web W on which the first color printing has been performed by the first color upstream printing unit 10a is then sent to the second color downstream printing unit 10b. The tension of the web W sent to the subsequent printing unit 10b is adjusted by the compensator roller 14b. At this time, as will be described later, the control device 30 controls the driving of the compensator 16b, and the driving of the compensator 16b changes the position of the compensator roller 14b in the direction of the arrow in FIG. It is adjusting.

  The web W is further sent to the plate cylinder 11b of the latter-stage printing unit 10b, and the web W is sandwiched between the plate cylinder 11b and the impression cylinder 12b to perform the second color printing. At this time, a second registration mark is attached to the web W by the plate cylinder 11b. Next, the first registration mark and the second registration mark on the web W sent from the plate cylinder 11b are respectively detected by the registration mark detection sensor 15b, and the signals of these registration marks are detected by the registration controller of the control device 30. 30a.

The web W on which the second color printing has been performed in the latter-stage printing unit 10b is then sent to the third-color latter-stage printing unit 10c for printing. The action of the second-color printing unit 10c for the third color on the web W is substantially the same as that of the second-color printing unit 10b for the second color, and the web sent from the plate cylinder 11c by the registration mark detection sensor 15c. A second registration mark and a third registration mark on W are respectively detected, and signals of these registration marks are sent to the registration controller 30a of the control device 30.
Similarly, the web W on which the third color printing has been performed in the subsequent printing unit 10c is then sent to the fourth printing unit 10d for printing. The action of the post-printing unit 10d for the fourth color on the web W is substantially the same as the action of the post-printing units 10b and 10c for the second and third colors described above, and the printing drum 11d is detected by the registration mark detection sensor 15d. The third registration mark and the fourth registration mark on the web W sent from are detected, and signals of these registration marks are sent to the registration controller 30 a of the control device 30.

Next, the control method by the control device 30 will be described in further detail with reference to FIG.
As shown in FIG. 2, the registration controller 30a of the control device 30 corresponds to the subsequent printing units 10b, 10c, and 10d, and the registration deviation calculators 31b, 31c, and 31d, and the registration deviation calculators 31b, 31c, Compensator operation amount calculators 32b, 32c, 32d connected to 31d, and compensator controller 33b, 33c, 33d connected to each compensator operation amount calculator 32b, 32c, 32d.
As shown in FIG. 2, the registration error calculators 31b, 31c, and 31d are connected to the registration mark detection sensors 15b, 15c, and 15d of the subsequent printing units 10b, 10c, and 10d, respectively. , 15c, 15d, the registration mark signals on the web W are sent to the registration deviation calculators 31b, 31c, 31d.
The compensator controllers 33b, 33c, and 33d are connected to the compensator motors 16b, 16c, and 16d of the subsequent printing units 10b, 10c, and 10d, respectively.

First, the operation of each of the registration error calculators 31b, 31c, and 31d will be described by taking the registration error calculator 31b at the most upstream side as an example.
In the registration deviation calculator 31b, the second registration mark and the subsequent printing unit, which are detected by the registration mark detection sensor 15b of the corresponding succeeding printing unit 10b and attached on the web W by the plate cylinder 11b of the succeeding printing unit 10b. The amount of misregistration is obtained by subtracting a set value of a preset interval from the size of the interval of the first register mark attached by the plate cylinder 11a of the upstream printing unit 10a provided on the upstream side of 10b. A plurality of times Eb (n) (n is time) are detected over time at a preset time interval.
Specifically, this time interval is, for example, the time for which the plate cylinder 11b rotates once (t = 1), and the registration error calculator 31b uses a plurality of registration error sizes Eb (n), Eb ( n + 1), Eb (n + 2),... Eb (n + k) are detected.
The registration error calculators 31c and 31d perform substantially the same operation as the registration error calculator 31b. That is, by subtracting the set value from the size of the interval between the third registration mark and the second registration mark on the web W, the size of the registration deviation Ec (n) is obtained. By subtracting the set value from the size of the interval between the three registration marks, a plurality of registration deviations Ed (n) are detected over time at preset time intervals.

Next, the size Eb (n) of the registration error calculated by the registration error calculator 31b is sent over time to the compensator operation amount calculator 32b.
On the other hand, as shown in FIG. 2, the compensator operation amount calculator 32c includes a registration error magnitude Ec (n) calculated by the registration error calculator 31c and a registration error sent to the compensator operation amount calculator 32b. The size Ec ′ (n) of the registration error determined based on both the size Eb (n) and the size Eb (n) is sent over time.
Specifically, the size of the misregistration Ec ′ (n) sent to the compensator operation amount calculator 32c is a value obtained by the following equation (1).
Ec ′ (n) = Ec (n) + sEb (nt) (1)
In Expression (1), s is a preset control gain, and t is a preset delay time. The control gain s and the delay time t are set manually by the operator, for example, via a touch panel or the like in the setting device 30b, or automatically set according to the operating state of the gravure printing machine. ing.

  The expression (1) will be described in detail. The amount of misregistration Ec ′ (n) sent to the compensator operation amount calculator 32c is determined by the compensator operation amount calculator 32b corresponding to the subsequent printing unit 10b. The registration deviation magnitude Ec (n) calculated by the registration deviation calculator 31c after a predetermined delay time t has elapsed since the transmission of the distance Eb (nt), and the aforementioned registration deviation magnitude Eb. The size of the misregistration (Ec (n) + sEb (nt)) is obtained by adding the size of the misregistration sEb (nt) obtained by multiplying (nt) by the control gain s.

The registration deviation Ed ′ (n) sent to the compensator operation amount calculator 32d is also calculated by the same calculation as the registration deviation Ec ′ (n) sent to the compensator operation quantity calculator 32c. It has become. Specifically, the magnitude Ed ′ (n) of the registration error sent to the compensator operation amount calculator 32d is a value obtained by the following equation (2).
Ed ′ (n) = Ed (n) + sEc ′ (nt) (2)

FIG. 3 shows the magnitudes of misregistration Eb (n), Ec ′ (n), Ed ′ (n) sent to the compensator operation amount calculators 32b, 32c, 32d over time. In the control device 30 according to FIG. 3, the control gain is set to s = 1 and the time delay is set to t = 2.
In FIG. 3, the horizontal axis is time (t), and time flows in the right direction of FIG. Specifically, for example, at time t = n + 2, the size of the registration error sent to the compensator operation amount calculator 32b is Eb (n + 2), and the size of the registration error sent to the compensator operation amount calculator 32c is Ec ( n + 2) + Eb (n), and the magnitude of the registration error sent to the compensator operation amount calculator 32d is Ed (n + 2) + Ec (n).

  As shown in FIG. 3, at time t = n + k, the magnitude of the registration error sent to the compensator operation amount calculator 32b is Eb (n + k), and the magnitude of the registration error sent to the compensator operation amount calculator 32c is Ec. (N + k) + Eb (n + k−2), and the size of the registration error sent to the compensator operation amount calculator 32d is Ed (n + k) + Ec (n + k−2) + Eb (n + k−4).

Next, the operation of each compensator operation amount calculator 32b, 32c, 32d will be described by taking the compensator operation amount calculator 32b at the most upstream side as an example.
The compensator operation amount calculator 32b performs PID control so that the magnitude Eb (n) of misregistration sent to the compensator operation amount calculator 32b is reduced, and the operation amount Xb of the compensator roller 14b of the rear printing unit 10b ( n) is calculated over time at the above-described time interval (for example, the time for which the plate cylinder 11b rotates once). Here, PID control refers to control that combines proportional control (P control), integral control (I control), and differential control (D control).
In the compensator operation amount calculators 32c and 32d, substantially the same operation as that of the compensator operation amount calculator 32b is performed, and the amount of misregistration Ec ′ (n) sent to the compensator operation amount calculators 32c and 32d, respectively. A plurality of operation amounts Xc (n) and Xd (n) of the compensator rollers 14c and 14d are calculated over time at the aforementioned time interval so that Ed ′ (n) becomes small.

  As shown in FIG. 2, the signals of the manipulated variables Xb (n), Xc (n), and Xd (n) (n is time) are sent to the compensator controllers 33b, 33c, and 33d with time. It has become.

  The compensator controllers 33b, 33c, and 33d receive the operation amounts Xb (n), Xc (n), and Xd (n) of the compensator rollers 14b, 14c, and 14d sent to the compensator controllers 33b, 33c, and 33d, respectively. Based on this, the driving of the compensator motors 16b, 16c, 16d of the subsequent printing units 10b, 10c, 10d is controlled to adjust the positions of the compensator rollers 14b, 14c, 14d.

According to the gravure printing machine and the control method thereof according to the present embodiment, as described above, for example, the registration deviation magnitude Ec (n) calculated by the registration deviation calculator 31c corresponding to the subsequent printing unit 10c, and this The amount of misregistration obtained based on both the magnitude of misregistration Eb (n) sent to the compensator operation amount calculator 32b corresponding to the latter-stage printing unit 10b provided on the upstream side of the latter-stage printing unit 10c. Ec ′ (n) is sent to the compensator operation amount calculator 32c corresponding to the latter-stage printing unit 10c.
For this reason, when the registration of printing is performed by the compensator roller 14b in the downstream downstream printing unit 10b, the downstream compensator roller 14c of the downstream downstream printing unit 10c is considered in consideration of the registration variation caused by the upstream tension variation. Can be controlled. In this way, the misregistration of printing by the subsequent printing units 10b, 10c, and 10d can be quickly converged to a steady state.

The preset delay time t has elapsed since the register controller 30a of the control device 30 sends the magnitude Eb (nt) of the misregistration to the compensator operation amount calculator 32b corresponding to the subsequent printing unit 10b. Later, the size Ec (n) of the registration error of the subsequent printing unit 10c calculated by the registration error calculator 31c corresponding to the subsequent printing unit 10c, and the compensation amount operation calculator 32b of the subsequent printing unit 10b have already been sent. The registration deviation magnitude sEb (nt) obtained by multiplying the registration deviation magnitude Eb (nt) by a preset control gain s is added. Then, the register controller 30a sends the total size Ec ′ (n) (= Ec (n) + sEb (nt)) of the misregistration to the compensator operation amount calculator 32c.
For this reason, after a tension is applied to a predetermined portion of the web W by the compensator roller 14b of the upstream printing unit 10b on the upstream side, the compensator roller 14c of the downstream printing unit 10c on the downstream side is applied to the predetermined portion of the web W. In consideration of the time until the tension is applied (delay time t), the amount of misregistration in line with the actual operation can be sent to the compensator operation amount calculator 32c corresponding to the subsequent printing unit 10c. it can. Thereby, the misregistration of printing by the printing units 10b, 10c, and 10d can be converged to the steady state earlier.

  Examples and comparative examples of the gravure printing machine according to the present invention will be described below with reference to FIGS. FIG. 4 is a graph showing temporal changes in the size of the registration error calculated by the respective registration error calculators corresponding to the first to fourth post-printing units in the embodiment of the present invention. 5 is a graph showing a temporal change in the size of the registration error calculated by each of the registration error calculators corresponding to the first to fourth post-stage printing units in the comparative example. 4 and 5, the horizontal axis indicates time (sec), and the vertical axis indicates the size (mm) of the registration error calculated by each registration error calculator.

The gravure printing machine used in the examples and comparative examples is provided on the downstream side of the first printing unit and the first printing unit that first performs printing on the continuously conveyed web, and each is different from the web. Four rear printing units that perform color printing, a front printing unit, and a drive unit that drives each subsequent printing unit are provided. Further, this gravure printing machine has a control device for controlling the front-stage printing unit and each subsequent-stage printing unit.
The first-stage printing unit, second-stage printing unit, and drive unit in the gravure printing machine used in the examples and comparative examples are substantially the same as the first-stage printing unit 10a, the second-stage printing units 10b, 10c, 10d, and the driving unit 20 shown in FIG. It becomes the composition of.

Further, the control device of the gravure printing machine used in the examples and the comparative examples has a registration calculator, a compensator operation amount calculator, and a compensator controller, which are the above-described registration calculator 31b. 31c, 31d, compensator operation amount calculators 32b, 32c, 32d and compensator controllers 33b, 33c, 33d.
However, the example and the comparative example are different in the transmission method of the magnitude of the registration sent from the registration calculator to the compensator operation amount calculator.

That is, in the embodiment, as shown in FIG. 2 and FIG. 3, the size of the registration error sent to the compensator operation amount calculator corresponding to each subsequent printing unit is the registration error calculator corresponding to this subsequent printing unit. The amount of misregistration calculated by adding the magnitude of misregistration already sent to the compensator operation amount calculator of the other succeeding printing unit upstream of the succeeding printing unit. Yes.
Specifically, for example, in the compensator operation amount calculator 32c, the amount of the register Ec (n) calculated by the register deviation calculator 31c and the compensator operation before a preset time delay (t = 2). The registration magnitude Ec ′ (n) obtained by the following equation (3) is sent based on both the registration magnitude Eb (n−2) already sent to the quantity calculator 32b.
Ec ′ (n) = Ec (n) + Eb (n−2) (3)

On the other hand, in the comparative example, the size of the registration error sent to the compensator operation amount calculator corresponding to each subsequent printing unit is only the size of the registration error calculated by the registration error calculator corresponding to this subsequent printing unit. It has become.
Specifically, for example, the size Ec ′ (n) of the misregistration sent to the compensator operation amount calculator 32c is the size of the misregistration calculated by the misregistration calculator 31c as shown in Expression (4). Ec (n) is the same.
Ec ′ (n) = Ec (n) (4)

As shown in FIGS. 4 and 5, according to the present embodiment, even if a registration error occurs due to disturbances such as web acceleration / deceleration and paper splicing, printing is performed in the second and subsequent post-printing units. It can be seen that the absolute value of the size of misregistration (mm) converges to 0 mm at an early stage with respect to the comparative example.
That is, when adjusting the printing by adjusting the web tension by the compensator roller in the downstream printing unit as in this embodiment, the compensator roller of the downstream printing unit in consideration of the upstream registration fluctuation. It can be seen that the misregistration of printing by each printing unit can be converged to a steady state at an early stage by controlling.

It is a figure which shows the structure of the gravure printing machine of this Embodiment. It is a block diagram which shows the control method by the control apparatus of the gravure printing machine of FIG. It is explanatory drawing which shows the magnitude | size of the registration shift sent to each compensator operation amount calculator in the control apparatus of FIG. 2 with time. It is a graph which shows the time-dependent change of the magnitude | size of the registration calculated by each registration deviation calculator corresponding to each 1st-4th back | latter stage printing unit in the Example of this invention. It is a graph which shows the time-dependent change of the magnitude | size of the registration deviation calculated by each registration deviation calculator corresponding to each 1st-4th back | latter stage printing unit in a comparative example.

Explanation of symbols

10a Pre-stage printing units 10b, 10c, 10d Post-stage printing units 11a, 11b, 11c, 11d Plate cylinders 12a, 12b, 12c, 12d Impression cylinders 14b, 14c, 14d Compensator rollers 15b, 15c, 15d Registration mark detection sensors 16b, 16c, 16d Compensator motor 20 Drive unit 21 Line shaft 22 Drive motor 30 Controller 30a Register controller 30b Setter 31b, 31c, 31d Register deviation calculator 32b, 32c, 32d Compensator operation amount calculator 33b, 33c, 33d Compensator controller W Web

Claims (3)

A pre-stage printing unit having a plate cylinder for printing on a continuously conveyed web and attaching a register mark to the web;
A plate cylinder that is provided on the downstream side of the preceding printing unit and performs printing on the web and attaches a registration mark to the web, and a registration mark detection sensor that is provided on the downstream side of the plate cylinder and detects the registration mark on the web. And a plurality of subsequent printing units each having a compensator roller provided on the upstream side of the plate cylinder and configured to register the web sent to the plate cylinder,
A drive unit having a line shaft that is connected to the plate cylinder of the front-stage printing unit and the plate cylinder of each subsequent-stage printing unit, and that rotates each of the plate cylinders synchronously;
A registration mark detected by a registration mark detection sensor of one subsequent printing unit and attached on the web by a plate cylinder of the one subsequent printing unit; and a preceding printing unit provided on the upstream side of the one subsequent printing unit or A misregistration calculator that calculates the size of the misregistration between the registration marks attached by the plate cylinders of other subsequent printing units, and the operation of the compensator roller of one subsequent printing unit based on the size of the misregistration A compensator operation amount calculator for calculating the amount, and a compensator controller for controlling the position of the compensator roller of one subsequent printing unit based on the operation amount of the compensator roller sent from the compensator operation amount calculator A control device having a plurality of
The control device calculates the amount of misregistration calculated by the misregistration calculator corresponding to one subsequent printing unit and the compensator operation amount corresponding to the other succeeding printing unit provided on the upstream side of the one subsequent printing unit. A gravure printing machine, wherein the size of the registration error determined based on both the size of the registration error sent to the device is sent to a compensator operation amount calculator corresponding to one subsequent printing unit.   The control device sends a misregistration size to a compensator operation amount calculator corresponding to another subsequent printing unit, and after a preset delay time has elapsed, a misregistration calculator corresponding to one subsequent printing unit. And the size of the misregistration obtained by multiplying the size of the misregistration already sent to the compensator operation amount calculator of another subsequent printing unit by a preset control gain. 2. The gravure printing machine according to claim 1, wherein the sum of the misregistrations is sent to a compensator operation amount calculator corresponding to one subsequent printing unit. In the control method of the gravure printing machine according to claim 1,
A registration mark detected by a registration mark detection sensor of one subsequent printing unit and attached on the web by a plate cylinder of the one subsequent printing unit; and a preceding printing unit provided on the upstream side of the one subsequent printing unit or A step of calculating a size of a registration deviation between the registration mark attached by the plate cylinder of another subsequent printing unit by a registration deviation calculator of the control device;
A step of calculating an operation amount of a compensator roller of one post-stage printing unit based on a size of a registration error by a compensator operation amount calculator of a control device;
Based on the amount of operation of the compensator roller sent from the compensator operation amount calculator, the step of controlling the compensator roller of one subsequent printing unit by the compensator controller of the control device, and adjusting the position,
The size of the misregistration calculated by the misregistration calculator corresponding to one subsequent printing unit, and the compensator operation amount calculator corresponding to the other succeeding printing unit provided on the upstream side of the one subsequent printing unit. A control method for a gravure printing machine, wherein the size of a registration error determined based on both the size of the registration error is sent to a compensator operation amount calculator corresponding to one subsequent printing unit.

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