JPH1128805A - Register control method and device - Google Patents

Abstract

(57) [Summary] In an apparatus having a plurality of drive systems for driving a plurality of units, stable and high-precision registration is achieved without mechanically changing a transmission system and switching the drive systems. A register control method and a register control device that can be performed are provided. A downstream unit for processing a web is controlled in rotational speed by a drive system separate from a unit upstream of the unit, and a register shift of a web supplied to the downstream unit or discharged from the downstream unit is detected. And adjusting the path length of the web between the upstream unit and the downstream unit to correct the misregistration,
A register control method for adjusting the rotation speed of the drive system of the downstream unit when the adjustment of the path length exceeds a predetermined range, and a register control device to which the method is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of registering webs. Particularly, a stable and high-precision registration is performed in a multicolor printing machine or a combined printing / coating machine having a plurality of driving systems for separately driving each or a part of a plurality of printing or coating units. The present invention relates to a register control method and a register control device.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing the configuration of a so-called sectional drive in-line machine having separate drive motors in a printing section and a coating section. In this in-line machine, not only coating in the coating unit 103 but also printing can be performed by switching. In switching to printing, the driving system is switched so that stable registration accuracy is obtained. That is,
In the drive system switching device 105, the drive system of the plate cylinder of the coating unit is switched by mechanically changing the transmission system from the drive motor 106b of the coating unit to the drive motor 106a of the printing unit 102.

[0003]

As described above, the coating unit 1
In order to print with stable registration accuracy in 02
Since the drive system must be switched by mechanically changing the transmission system, the work load at that time is large for the operator of the inline machine. Further, a mechanism for switching the drive system is required, and the inline machine has a large scale and a complicated configuration. Therefore, a large installation space is occupied, and the equipment cost is high. Therefore, an object of the present invention is to provide stable and high-accuracy registration in a device having a plurality of drive systems for driving a plurality of units without mechanically changing the transmission system and switching the drive system. And to provide a register control method and a register control device.

[0004]

The above objects are achieved by the present invention described below. In other words, the present invention provides a method for controlling the rotational speed of a downstream unit for processing a web by a drive system separate from that of the upstream unit, so that misregistration of the web supplied to the downstream unit or discharged from the downstream unit is performed. And adjusting the web path length between the upstream unit and the downstream unit so as to correct the misregistration, and when the adjustment of the path length exceeds a predetermined range, the downstream path is adjusted. A register control method for adjusting the rotation speed of the drive system of the unit. According to the present invention, misregistration of a web supplied to or discharged from a downstream unit is detected, and the misregistration of the web path length between the upstream unit and the downstream unit is corrected. Adjustments are made to If the adjustment of the path length exceeds the predetermined range, the rotational speed of the drive system of the downstream unit is adjusted. As described above, by adjusting the path length of the web and adjusting the rotation speed of the drive system of the downstream unit in combination, stable and high precision registration can be achieved without mechanically changing the transmission system and switching the drive system. Matching can be performed.

[0005] The present invention also provides a driving unit capable of controlling the rotation speed of a downstream unit for processing a web separately from the upstream unit, and supplying to the downstream unit or discharging from the downstream unit. Misregistration detecting means for detecting misregistration of the web, a compensator for adjusting the path length between the downstream unit and the upstream unit, and operating the compensator so as to correct the misregistration. And a control means for controlling the rotation speed by operating the drive means of the downstream unit when the adjustment of the path length exceeds a predetermined range. According to the present invention, the downstream unit for processing the web is driven by the drive unit capable of controlling the rotation speed, and the register shift of the web supplied to the downstream unit or discharged from the downstream unit is performed by the register detection unit. Is detected, the path length between the downstream unit and the upstream unit is adjusted by the compensator, the compensator is operated by the control means so as to correct the misregistration, and the path length is adjusted. If it exceeds the predetermined range, the driving means of the unit is operated to adjust the rotation speed. As described above, by adjusting the path length of the web and adjusting the rotation speed of the drive system of the downstream unit in combination, stable and high precision registration can be achieved without mechanically changing the transmission system and switching the drive system. Matching can be performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to embodiments. FIG. 1 is a diagram showing a configuration of a printing / coating in-line machine provided with a register control device of the present invention. FIG.
1, 1 is a paper feeding unit, 2 is a printing unit, 3 is a coating unit, 4 is a winding unit, 5a and 5b are web winding bodies, 6a, 6b and 6
c is a printing unit, 7a, 7b and 7c are compensators, 9a and 9b are motors, 10 is a web, 11a and 11
b, 11c, 11d are plate cylinders, 12a, 12b, 12c,
12d is an impression cylinder.

As shown in FIG. 1, the basic configuration of this printing / coating in-line machine comprises a paper feeding unit 1, a printing unit 2, a coating unit 3, and a winding unit 4. The printing / coating in-line machine usually prints on the web 10 in the printing unit 2 and immediately applies the coating on the printed web in the coating unit 3. In other words, the printing / coating in-line machine is a device that performs the printing process and the coating process in one process. In this printing and coating inline machine,
The coating unit 3 can perform printing by switching as well as performing coating. The switching is performed so that the printing cylinder is used as the printing cylinder and the printing cylinder 11d is used as a printing cylinder, and registration of overprinting is enabled.

Before describing the register control device for registering, the overall operation of the printing and coating inline machine shown in FIG. 1 will be described first. The web 10 unwound from the winding body 5a of the paper feeding unit 1 is supplied to the printing unit 6a, and the web 10 is sent to the plate cylinder 11 by the impression cylinder 12a.
a, printing is performed by applying a printing pressure. Subsequently, the web 10 is guided by a guide roller to the dryer of the printing unit 6a, and the printing ink is dried. The web 10 sent from the dryer is supplied to the next printing unit 6b via the compensator 7a.

The compensator 7a includes a printing unit 6b
Is a device for performing registration with printing performed in the printing unit 6a when printing is performed in the printer. At the entrance of the dryer of the printing unit 6b, a register detector (not shown) detects a register shift from the distance between two register marks printed on the web 10 by the printing units 6a, 6b. Based on the detection signal of the misregistration, the compensator 7a performs the registration by adjusting the path length of the web 10 between the printing unit 6a and the printing unit 6b.

As described above, the web 10 on which printing has been performed in the printing units 6b and 6c is fed to the coating unit 3. As shown in FIG. 1, the printing unit 2 is driven by a motor 9a, and the coating unit 3 is driven by a motor 9b. The reason why the drive system is separated in this way is to reduce the restriction on coating in the coating unit 3 by the printing unit 2. For example, even if the coating plate cylinder is a gravure plate cylinder of the same plate type as the printing plate cylinder, it is not necessary to use a plate cylinder having the same diameter. Further, in the coating unit 3, various various coating methods can be implemented in addition to the gravure coating method. The web 10 that has been coated and dried in the coating unit 3 is supplied to the winding unit 4. The winding section 4 winds the web 10 to form a winding body.

Next, a case where printing is performed in the coating unit 3 will be described. Usually, the accuracy required for registering overprints in multicolor printing is high. On the other hand, the accuracy required for registering in coating is lower than the accuracy, or it is not necessary at all. When printing is performed in the coating unit 3, it is necessary to ensure required registration accuracy. FIG. 2 is a diagram illustrating the configuration of the register device of the present invention applied to the coating unit 3. In FIG. 2, FIG.
The same reference numerals are given to the same parts as in the first embodiment, 21 is a register mark detector, 22 is a register controller, 23 is a motor for operating the compensator 7c, and 24a and 24b are movable rollers of the compensator 7c (upper and middle positions). ), 25
Is an upper limit detector for detecting the upper limit movable roller 24a;
Is a lower limit detector for detecting the lower limit movable roller, and 28 is a rotation speed control device for controlling the rotation speed of the motor 9b for driving the coating unit 3.

As described above, the coating unit 3 is driven by a motor 9b different from the motor 9a for driving the printing unit 2. The motors 9a and 9b can be driven at the same rotation speed and the same phase without mechanically connecting the rotating shafts of the motors 9a and 9b by a transmission system. For example, the rotation speed and phase can be controlled as a motor capable of driving the motors used for the motors 9a and 9b at the same rotation speed and the same phase, for example, an AC servomotor, a vector inverter motor, and the like. However, even when such a drive system is used, complete control cannot be performed depending on the state of the load. In addition, a motor that performs simpler speed control may be used due to cost and other requirements. According to the register control device of the present invention,
Even when the motor 9a and the motor 9b cannot be completely driven at the same rotation speed and the same phase, stable and highly accurate registration can be performed.

As described above, when it is impossible to completely drive the motor 9a and the motor 9b at the same rotation speed and the same phase, it is impossible to avoid the occurrence of misregistration as it is. FIG. 2 shows a configuration for avoiding this. The register mark detector 21 includes a register mark printed in the upstream printing unit 6c and a register mark printed in the downstream coating unit 3 on which a printing plate is mounted. And a register error is detected from the interval between the two and outputs a register error signal. The register control device 22 inputs the register shift signal and outputs an operation amount so as to correct the register shift. Motor 23
Has a motor driver, moves the movable roller 24b by inputting the operation amount, and adjusts the path length of the web 10 between the printing unit 6c and the downstream coating unit 3 on which the printing plate is mounted. Immediately after the movement of the movable roller 24b, the actual length of the web 10 on the path does not change and the tension changes. Then, in the process of mitigating the tension fluctuation and shifting to the steady state, the entire length of the web 10 as an entity matches the adjusted path length. This adjustment is made to correct the misregistration and is registered.

In such a case that the motor 9a and the motor 9b cannot be completely driven at the same rotation speed and the same phase, the correction of the misregistration continues continuously even if the degree is different. Can be considered. As a result, the movement of the movable roller 24b continues without interruption, and reaches the limit of the movable range of the movable roller 24b.

The upper limit detector 25 of the compensator 7c detects that the movable roller 24b has reached the upper limit of the movable range and outputs an upper limit signal. The lower limit detector 26 detects that the movable roller 24b has reached the lower limit of the movable range and outputs a lower limit signal. The upper limit signal and the lower limit signal are input by the rotation speed controller 28, and output an operation amount for operating the speed of the motor 9b so that the movable roller 24b falls within the movable range. The motor 9b has a motor driver, and the motor driver inputs the operation amount to adjust the rotation speed of the motor 9b. When the upper limit signal is input, the rotation speed of the motor 9b is increased so as to increase the feeding speed of the web 10 and shorten the path length of the web. Also,
When the lower limit signal is input, the rotation speed of the motor 9b is reduced so that the feeding speed of the web 10 is reduced and the path length of the web is increased.

In the printing / coating in-line machine shown in FIG. 1, the motor 9a for driving the printing unit 2 is used as a main motor in a normal operation to start operation, increase speed, decelerate,
The motor 9b of the coating unit 3 and the motors of the sheet feeding unit 1 and the winding unit 2 can perform operations such as stopping and the like. That is, the rotation speed of the motor 9b is synchronized with the rotation speed of the motor 9a. In that case, the rotation speed of the motor 9b is given by a speed ratio to the rotation speed of the motor 9a. In this case, "increase the rotation speed of the motor 9b" in the above description means "increase the speed ratio of the rotation speed of the motor 9b to the rotation speed of the motor 9a". "Reducing the rotation speed of the motor 9b" means "reducing the speed ratio of the rotation speed of the motor 9b to the rotation speed of the motor 9a".

Next, the process of the register control will be described. FIG. 3 is a flowchart showing a register control process according to the present invention. The register control process shown in FIG. 3 is performed by the control of a control unit having a combined function of the register control device 22 and the rotation speed control device 28 in FIG. In step S1, a registration error (register error) is read (detected) by a scanning head (register error detector).
Next, in step S2, it is determined whether the printed pattern of the web 10 is advanced or delayed compared to the pattern on the plate surface of the plate cylinder 11d. If so, the process proceeds to step S3. If it is late, the process proceeds to step S7.

In step S3, the compensator roller (movable roller 24b) is moved upward in the direction of increasing the web path length. Next, in step S4, it is determined whether the position of the compensator roller has reached the upper limit. If the upper limit has not been reached, the process returns to step S1 and the subsequent steps are repeated. If the upper limit has been reached, the process proceeds to step S5. In step S5, the rotation speed of the motor 9b for driving the plate cylinder 11d is increased. Next, in step S6, it is determined whether to end or continue the register control process. If the register control process is to be continued, the process returns to step S1 and the subsequent steps are repeated.
When ending the register control process, the process ends.

On the other hand, in step S2, the web 10
If the printed pattern is behind the pattern on the plate surface of the plate cylinder 11d, the process proceeds to step S7. Step S7
, The rotational speed of the motor 9b for driving the plate cylinder 11d is reduced. Next, in step S6, it is determined whether to end or continue the register control process. If the register control process is to be continued, the process returns to step S1 and the subsequent steps are repeated. When ending the register control process, the process ends.

Although the present invention has been described based on the embodiments, the present invention is not limited to the embodiments, and can be implemented in various forms based on the technical idea of the present invention. It goes without saying that the present invention is also included in the present invention. For example, in the embodiment, the register control when performing printing in one coating unit of the printing / coating in-line machine is described as an example, but the register control when performing printing in a plurality of coating units is also described. Clearly applicable. Further, the present invention is not limited to the inline machine, and can be applied to a printing machine in which each printing unit is provided with an individual motor as a drive system of the printing unit. In addition to the printing machine, a processing device that performs processing while performing alignment on the web, for example, an embossing device, a punching device, a business form processing device,
The present invention can be applied to register control such as the above.

For example, in the embodiment, an example is described in which a register shift is detected by a register shift detector immediately after printing, but a register mark sensor printed by an upstream printing unit by a register mark sensor immediately before printing is detected. Then, it is possible to detect the misregistration by detecting the phase of the plate cylinder with a rotary encoder or the like and calculating the misregistration amount from the detected phase. According to this method, misregistration can be detected even when printing is performed with a light color ink that is difficult to detect in a downstream printing unit.

Further, for example, in the embodiment, an example in which the movable range of the compensator roller is detected by the upper limit detector and the lower limit detector has been described. However, instead of detecting the upper limit and the lower limit, the position of the compensator roller is determined. The speed of the motor can be controlled based on the detection and the displacement from the predetermined position. A limit switch or a proximity switch can be used for the upper limit detector and the lower limit detector. For detecting the position of the compensator roller, an encoder (absolute encoder) that can detect the position as an absolute position (not a relative position),
It is possible to use a counting device that counts the number of generations of the pulse signal that moves the compensator roller by adding a sign to the moving direction.

[0023]

As described above, according to the present invention, in an apparatus having a plurality of drive systems for driving a plurality of units, the drive system is not changed by mechanically changing the transmission system. A register control method and a register control device capable of performing stable and high-accuracy register can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a printing / coating in-line machine including a register control device of the present invention.

FIG. 2 is a diagram showing a configuration of a register device of the present invention.

FIG. 3 is a flowchart showing a process of register control in the present invention.

FIG. 4 is a diagram showing a configuration of a so-called sectional drive in-line machine having separate drive motors in a printing unit and a coating unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Paper feed part 2 Printing part 3 Coating part 4 Winding part 5a, 5b Web winding body 6a, 6b, 6c Printing unit 7a, 7b, 7c Compensator 9a, 9b, 23 Motor 10 Web 11a, 11b, 11c, 11d plate cylinder 12a, 12b, 12c, 12d impression cylinder 21 register mark detector 22 register control device 24a, 24b movable roller (indicating upper and middle positions) 25 upper limit detector 26 lower limit detector 28 rotation speed control device

Claims (2)

[Claims] 1. A downstream unit for processing a web is controlled in rotational speed by a drive system separate from a unit upstream of the unit, and a misregistration of a web supplied to the downstream unit or discharged from the downstream unit is controlled. Detecting and adjusting the path length of the web between the upstream unit and the downstream unit so as to correct the misregistration, and when the adjustment of the path length exceeds a predetermined range, the downstream unit. Adjusting the rotational speed of the drive system. 2. A drive unit capable of controlling a rotation speed of a downstream unit for processing a web separately from an upstream unit thereof, and a driving unit for supplying a web to the downstream unit or discharging a web discharged from the downstream unit. A misregistration detecting means for detecting misregistration, a compensator for adjusting a path length between the downstream unit and the upstream unit, and adjusting the path length by operating the compensator so as to correct the misregistration And a control means for operating the drive means of the downstream unit to adjust the rotation speed when the adjustment of the path length exceeds a predetermined range.