JP2010222118A - Method for controlling tension of rotary press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a speed response can not catch up with a fluctuating speed of disturbance when the disturbance is inputted in tension for some reason, and elimination of an influence of the disturbance is difficult in a method for controlling tension of a rotary press. <P>SOLUTION: In this method for controlling the tension of the rotary press, with respect to the tension of a web traveling between an in-feed roll unit and a transfer unit, and the transfer unit and an out-feed roll unit, a difference in a peripheral speed between an in-feed roll and a transfer roll is detected, a difference in a peripheral speed between an out-feed roll and the transfer roll is also detected, and then the rotational frequency of a driving motor is controlled so that a difference between a set web tension and a web tension detected by a tension detector falls within a target value. Since the tension is thus controlled so as to prevent the occurrence of a change in the tension of the web among the in-feed roll unit, roll transfer device, and out-feed-roll unit, the stable traveling of the web is performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tension control method for a rotary printing press.

Conventionally, as a web tension control device, for example, a device disclosed in Japanese Unexamined Patent Application Publication No. 2007-69455 (Patent Document 1) has been proposed.
The present invention is a tension control device for controlling the tension of a continuously running web to a set tension, the first and second running means provided on the running path of the web for running the web, A dancer roller around which the web that travels from the first travel toward the second travel means is wound, an arm that is rotatably held around a predetermined support shaft, and that rotatably holds the dancer roller; A dancer roller device having an actuator that applies a predetermined force according to a set tension in a direction in which the tension is generated on the arm, and the arm is moved at a predetermined speed, and the arm is positioned at a predetermined position. The first control means for controlling the speed of the first and second traveling means, and the dancer low according to the rotation angle of the arm from the predetermined position. Force acting on the web from having a second control means for controlling the force to be generated by the actuator so as to be constant.

 In addition, an angle detector that detects a rotation angle of the arm and outputs a detection signal to the second control unit, and the actuator includes an air cylinder and a pressure of compressed air supplied to the air cylinder. And an electropneumatic converter that adjusts according to a control command from the second control device.

  In addition, the tension control method includes a dancer roller on which a running web is wound, an arm that is rotatably held around a predetermined support shaft, and that holds the dancer roller rotatably, and tension on the web on the arm. A tension control method for controlling the tension of a web that is continuously running by a dancer roller device having an actuator that applies a predetermined force according to a set tension in the direction in which the web is generated, the web running at a predetermined speed, In addition, during the running control of the web so that the arm is located at a predetermined position, the force acting on the web from the dancer roller is constant according to the rotation angle of the arm from the predetermined position. The force generated by the actuator is controlled so that

JP 2003-54800 A

  In the prior art disclosed in Patent Document 1, the speed response cannot catch up with the fluctuation speed when a change in the diameter of the roller is input or due to a processing error, and the influence of disturbance cannot be removed. This dancer roller system detects the position of the roller supported by the air cylinder and feedback controls the adjustment of the web tension so that the position of the roller is always constant. In the case of a printing press, color misregistration occurs in the meantime, resulting in a large number of printing defects.

  According to the present invention, when a new printing is performed, the tension of a rotary printing press capable of correcting the diameter of the infeed roller in accordance with the change of the roll diameter at the time of exchanging the plate cylinder and performing printing with a predetermined set tension P. It aims to provide a control method.

In the present invention, an infeed roll unit combined with an infeed roll is provided in the web introduction portion of the rotary printing press, and a plurality of outfeed rolls are combined in the discharge portion of the web of the rotary printing press. An outfeed roll unit is provided, and the infeed roll unit includes a plurality of infeed rolls and a drive motor that rotationally drives the infeed roll, and the outfeed roll unit includes the outfeed roll and the outfeed roll. A tension control method for a rotary printing press composed of a servomotor that rotationally drives an outfeed roll that drives a roll,
Detecting the difference between the peripheral speed of the infeed roll and the peripheral speed of the transfer roll, the tension of the web running between the infeed roll unit and the rotary press, and the rotary press and the outfeed roll unit; The rotational speed of the servo motor is controlled so that the difference between the peripheral speed of the outfeed roll and the peripheral speed of the transfer roll is detected and the difference between the set web tension and the web tension detected by the tension detector becomes a target value. It is characterized by.

  The tension control method for a rotary printing press according to the present invention controls the tension so as not to cause fluctuations in the tension between the in-feed roll unit, the roll transfer device, and the out-feed roll unit. Thus, misprints that occur during a test run of printing can be extremely reduced.

It is a schematic side view of a 6-color gravure printing machine. It is a schematic side view of a tension control part. It is a block diagram which shows the synchronous control apparatus of a 6 color gravure printing machine.

  Hereinafter, an embodiment in which a tension control method for a rotary printing press according to the present invention is applied to a six-color gravure printing press will be described with reference to the accompanying drawings.

(Embodiment 1)
In FIG. 1, a paper feeding unit 10, an infeed unit 12, a printing unit unit 11 (a first printing unit unit 11a, a second printing unit unit 11b, a third printing unit unit 11c, a fourth printing unit unit 11d, and a fifth printing unit). The unit unit 11e, the sixth printing unit unit 11f), the outfeed unit 14, the tension adjusting roll 12a, the tension adjusting rolls 12b and 12c, and the winding unit 16 are configured.

  The first printing unit unit 11a, the second printing unit unit 11b, the third printing unit unit 11c, the fourth printing unit unit 11d, the fifth printing unit unit 11e, and the sixth printing unit unit 11f all have the same unit configuration. A plurality of guide roll groups 18 are linked via gears (not shown), and are independently driven by a servo motor 17. A plate cylinder 22 is supported at the lower end of the guide roll group 18, and ink is in contact with the plate cylinder 22. A roller is rotatably supported by the frame.

Further, as shown in FIG. 2, tension detectors are provided between the infeed roll 12a of the infeed section 12 and the first printing unit section 11 and between the outfeed roll 14a and the winding section 16 of the outfeed section 14, respectively. (Not shown) is provided. The paper feeding unit 10 and the winding unit 16 are provided with known tension control units 43a and 43b, respectively, between the infeed unit and the first printing unit unit 11a, and between the outfeed unit 14 and the winding unit 16. It is comprised so that the tension | tensile_strength of can be adjusted.
The infeed unit 12, the first printing unit unit 11a, the outfeed unit 14, and the winding unit 16 are respectively a servo controller 35 (35a, 35b, 35c, 35d, 35e, 35f), an infeed contra 35g, and Synchronously controlled by the outfeed contra 35h.

FIG. 3 shows a synchronous operation control system of the gravure rotary printing press 1. The synchronous control device 30 includes a DSP (digital signal processor) unit 31 that operates as an integrated control unit, a memory unit 32 that stores various data, and a plate cylinder servo controller 35 (35a, 35b, 35c, 35d, 35e, 35f), infeed contra 35g and outfeed contra 35h, tension control units 43a, 43b, and input / output I / F unit 34. It comprises a digital signal processor (DSP) 31, a memory 32, a servo controller 35, an input / output unit I / F 34 comprising an input unit 34a and a display unit 34b, a paper feed unit 10 and a control unit 35 for the winding unit 16. . The servo controller 35 includes an infeed unit 12, a first printing unit unit 11a, a second printing unit unit 11b, a third printing unit unit 11c, a fourth printing unit unit 11d, a fifth printing unit unit 11e, and a sixth printing unit unit. 11f and the drive part of the outfeed part 14, respectively.
When the DSP 31 gives an operation command and a speed command from the printing press control circuit 35, each servo controller 35 gives a rotation angle signal from the printing press control circuit corresponding to the command at the same timing.
Each servo controller 35 outputs a drive signal corresponding to the command to the servo motor 17, and a feedback signal from the encoder 37 is input to the servo controller 35.

The servo controller 35 has a software servo function that configures an angular position loop of a fixed period (servo system sampling period) and controls each servo system. During constant speed operation, the DSP 31 maintains a time interval corresponding to the speed command and continuously commands the rotation angle signal to the servo controller 35.
At this time, the synchronization of the servo motor 17 is maintained by the software synchronization of the DSP 31. During acceleration and deceleration, a rotation angle signal is continuously generated while maintaining a change rate according to a predetermined target acceleration time and deceleration time. That is, the synchronization of the plate cylinder 22 is maintained by the software synchronization of the DSP 31.
Note that the tension control of the paper feeding unit 10 and the winding unit 16 is performed separately by a set tension control according to a speed signal and a control command from the DSP 31 to the servo motor 17.

The input / output I / F unit 34 includes an input unit 34a, a display unit 34b such as a CRT, and a register mark detector (11a, 11b, 11c, 11d, 11e, 11f) provided for each printing unit 11 (11a, 11b, 11c, 11d, 11e, 11f). Are not connected).
In the memory unit 32, in addition to an area for storing various data input by the input unit 34a and the like, a plate cylinder phase angle storage means for storing a plate cylinder phase angle for each printing unit, and a web for each printing unit Web path length storage means for storing the path length and web winding information storage means for storing the web winding information, the normal paper, the waste paper information, etc. are provided for each printing unit.

The DSP unit 31 stores the data in the memory unit 32 when a job identification code, various data, or the like is input from the input device 34a. Further, when an operation command and a speed command are given from the printing press controller 40, the printing cylinder servo controller 35 (35a, 35b 35c, 35d, 35e, 35f) and the feed roller servo controller 33i of the printing unit that executes printing are simultaneously provided. Each position command (rotation angle) signal is given.
In addition, the DSP unit 31 maintains a time interval corresponding to the speed command during constant speed operation, and continuously generates a position command signal to the servo controller 35. At this time, the synchronization of each plate cylinder 7 is maintained by the software synchronization of the DSP unit 31. At the time of acceleration / deceleration, position command signals are continuously generated while maintaining the rate of change according to a predetermined target angular acceleration according to acceleration time and deceleration time. Maintain sex.

    A speed command signal is given as a control target value from the DSP unit 31 to each plate cylinder servo controller 35, in-feed contra 35g, and out-feed contra 35h. In response to this, a drive signal corresponding to the command signal from the servo amplifier 36 (E1, E2, E3, E4, E5, E6, EIF, EOF) is sent to the servomotor 17 (M1, M2, M3, M4, M5, M6, When output to MI, MO), the rotation angle position signal (rotation phase signal) is output from the encoder 37 (S1, S2, S3, S4, S5, S6, S7, S8) connected to the shaft end of the servo motor 17. Is input to the plate cylinder servo controller 35 and the infeed contra 35g as a position feedback signal. The plate cylinder servo controller 35 and the infeed contra 35g constitute a position loop having a fixed period (servo system sampling period) and have a software servo function for controlling each servo system.

The tension control units 43a and 43b are driven in synchronization by a tension control command signal from the DSP unit 31 synchronized with a command signal to the plate cylinder servo controller 35. That is, the tension control units 43a and 43b output drive signals to the unwinding unit 3, the infeed unit 12a, the outfeed unit 14, and the winding unit 16 based on the tension control command signal from the DSP 31, and the web tension control. I do.
The tension adjusting unit 43a and the tension adjusting unit 43b shown in FIG. 2 include infeed rolls 12a and 14b (dancer rollers) rotatably supported at the tips of the piston rods 40b and 41b of the air cylinder 40a and the air cylinder 41a, respectively. In addition, a linear sensor (not shown) for detecting the displacement of the piston rod 41 is provided, so that the web tension can be detected and the web tension can be controlled.
And when disturbance etc. arise in the web T and slack arises in the web T, the tension | tensile_strength which acts on the web T from the infeed roll 12a will fall if the force which generate | occur | produces in the air cylinders 40a and 41a remains constant. Therefore, compressed air is supplied to the air cylinders 40a and 41a.
On the contrary, since tension occurs in the web T and the infeed roll 12a and the outfeed roll 14a act upward in the vertical direction of the piston rods 40b and 41b, the infeed roll 12a and the outfeed roll 14a act on the web T. Therefore, the compressed air in the air cylinders 40a and 41a is exhausted, and the fluctuation of the tension of the web T is suppressed.

Hereinafter, the relationship between the web tension in the infeed section 12 and the rotation speed of the infeed roller and the plate cylinder will be described. The web tension control is omitted because the explanation of the outfeed section is the same.
Infeed roller peripheral speed Vi (m / sec)
Plate cylinder peripheral speed Vp (m / sec)
Web cross section A (mm ² )
Web longitudinal elastic modulus E (N / mm ² )
Infeed roll / printing unit tension Pi (N)
Then,

・・・・・・・・・・（１）
すなわち、
版胴径 Ｄｐ
版胴／版胴サーボモータ間変速比 Ｇｐ
版胴サーボモータ回転数 Ｎｐ
インフィードローラ径 Ｄｉ
インフィードローラ／インフィードローラサーボモータ間変速比 Ｇｉ
インフィードローラのサーボモータ回転数 Ｎｉ
版胴周速 Ｖｐ
インフィードローラ周速 Ｖｉ
すると、
Ｖｐ＝Ｎｐ・Ｇｐ・π・Ｄｐ ・・・・・・・（２）
Ｖｉ＝Ｎｉ・Ｇｉ・π・Ｄｉ ・・・・・・・（３）
ここで、設定張力をＰ、印刷速度Ｖとすると、
Ｖ＝Ｖｐ
として、版胴サーボモータ回転数Ｎｐを求める。

(1)
That is,
Plate cylinder diameter Dp
Speed change ratio between plate cylinder / plate cylinder servomotor Gp
Plate cylinder servo motor speed Np
Infeed roller diameter Di
Gear ratio between infeed roller / infeed roller servomotor Gi
Infeed roller servo motor speed Ni
Plate cylinder peripheral speed Vp
Infeed roller peripheral speed Vi
Then
Vp = Np · Gp · π · Dp (2)
Vi = Ni · Gi · π · Di (3)
Here, if the set tension is P and the printing speed V,
V = Vp
The plate cylinder servo motor rotation speed Np is obtained as follows.

・・・・・（４）
又（１）式より

・・・・・（５）
よって、インフィードローラのサーボモータ回転数Ｎｉは

Next, the servo motor speed Ni of the in-feed roller necessary to obtain the set tension
Ask for.

From equation (2)

(4)
From equation (1)

(5)
Therefore, the servo motor speed Ni of the infeed roller is

よって

Printing is performed by a gravure printing machine based on the rotation speed Np of the servo motor 17 and the rotation speed Ni of the servo motor M1 of the infeed roller 12a obtained by the above calculation.
If a tension difference ΔP (= Pic−P) between the set tension P and the tension detection value Pic between the infeed roll 12a and the printing unit unit 11 is generated, the virtual diameter Dic of the infeed roller 12a that corrects ΔP to zero. Is calculated, the rotation speed Nic of the servo motor 17 of the infeed roller 12a is obtained, and if the operation is performed at this rotation speed Nic, the set tension P is obtained.
From the difference between the set tension at this time and the actual tension, the peripheral speed difference ΔVi of the infeed roll with respect to the plate cylinder is obtained.

Therefore

インフィードローラの仮想径Ｄｉｃは、

インフィードローラの回転数は、

以上により、新たな印刷を行なう場合に、版胴が交換されると、上述した手順に従いインフィードローラの径を修正し、予め定めた設定張力Ｐで印刷を行なうことができる。 The difference in feed roller rotation speed ΔNi is

The virtual diameter Dic of the infeed roller is

The rotation speed of the infeed roller is

As described above, when new printing is performed, if the plate cylinder is replaced, the diameter of the infeed roller can be corrected according to the above-described procedure, and printing can be performed with a predetermined set tension P.

  According to the tension control method for a rotary printing press of the present invention, the tension is controlled so as not to cause fluctuations in the tension between the in-feed roll unit, the rotary press, and the out-feed roll unit. It is.

T web 10 paper feeding section 11 (11a, 11b, 11c, 11d, 11e, 11f) printing unit section 12 infeed section 12a infeed roll 14 outfeed section 14a outfeed roll 15 tension adjusting roll 16 winding section 17 (M1) , M2, M3, M4, M5, M6, MI, MO) Servo motor 18 Guide roll 19 Servo controller 20 Tension controller 22 Plate cylinder 23 Ink roller 30 Synchronous controller 31 Digital signal processor (DSP)
34 Input / output I / F section 34a Input section 34b Display section 35 (35a 35b 35c 35d 35e 35f) Servo controller 35g In-feed contra
35h Outfeed contra
36 E1, E2, E3, E4, E5, E6, EIF, EOF Servo amplifier 37 (S1 S2 S3 S4 S5 S6 S7 S8) Encoder
40a Air cylinder
40b Piston rod 41a Air cylinder
41b Piston rod 43a Tension controller 43b Tension controller

Claims (1)

An infeed roll unit combined with an infeed roll is provided at the web introduction portion of the rotary printing press, and an outfeed roll unit combined with a plurality of outfeed rolls is provided at the web discharge portion of the rotary printing press. The infeed roll unit includes a plurality of infeed rolls and a drive motor that rotationally drives the infeed roll, and the outfeed roll unit includes the outfeed roll and an outfeed roll that drives the outfeed roll. A tension control method for a rotary printing press composed of a servo motor that rotationally drives a feed roll,
Detecting the difference between the peripheral speed of the infeed roll and the peripheral speed of the transfer roll, the tension of the web running between the infeed roll unit and the rotary press, and the rotary press and the outfeed roll unit; The rotational speed of the servo motor is controlled so that the difference between the peripheral speed of the outfeed roll and the peripheral speed of the transfer roll is detected and the difference between the set web tension and the web tension detected by the tension detector becomes a target value. A tension control method for a rotary printing press characterized by the above.

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