JPH0584894A - Sectional drive device of printing line - Google Patents

Abstract

PURPOSE:To maintain the tension of each section at a constant level and thereby enhance printing accuracy by adjusting the speed and tension of each printing line using a positional control and a torque bias compensation control in the normal mode and a speed and accelerated speed feed forward control in the speed acceleration and reduction mode. CONSTITUTION:For the sectional drive of a printing line, an integrator 16 which integrates a speed command value and calculates a position command value, a position gain 17, a speed gain 18 and a torque bias compensation circuit 20 respectively are installed on the control system of each section. In addition, a differentiator 29 which differentiates a speed command value and generates a speed acceleration feed forward (FF) signal 28, a speed detector which is installed on a motor 22 to generate a feedback signal 24 and a position detector which is installed on a roll 23 to generate a feedback signal 26 are provided. During normal operation, speed and tension are adjusted using a position control and a torque bias compensation control. On the other hand, in the speed acceleration and reduction mode, speed and tension are controlled using a speed FF control and a speed acceleration FF control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sectional drive device for a printing machine.

[0002]

2. Description of the Related Art Conventionally, in a printing machine or the like, line control accuracy is remarkably required from the viewpoint of printing quality. Therefore, a line shaft drive (one motor is shared by one line and each section is shared by one line). A method of connecting and driving with a line shaft of a book) is adopted.

FIG. 5 shows a general printing machine line, 1 is a paper feed / infeed section, 2 is a printing section, 3 is a dryer section, 4 is a cooling section, 5 is a web path section, and 6 is a folding machine. Is.
FIG. 7 shows a line shaft drive, where 7 is a paper feed unit, 8 is an in-feed unit, 9 is a motor, and 33 is a line shaft drive.

[0004]

The above-described line shaft drive has the following problems. (1) The line layout lacks flexibility. (2) Due to the rigidity of the line shaft, there is a limit to the speed and size of the machine. (3) A continuously variable transmission or the like is used to connect the line shaft and the section, but there are problems in maintenance and operation.

As a countermeasure against these problems, a sectional drive having a motor in each section has been proposed. However, if the line speed is controlled only by speed control, a predetermined tension cannot be obtained. The present invention (1) keeps the tension of each section constant over a wide speed range,
(2) A sectional drive device having high printing accuracy capable of keeping the tension of each section constant even if there is a constant or fluctuating mechanical loss, and (3) keeping the tension of each section constant during acceleration / deceleration. It is intended to provide.

[0006]

A sectional drive device is constructed by incorporating position control, torque bias compensation control, speed feedforward control, and acceleration feedforward control.

[0007]

[Action]

(1) The speed and tension in the steady state (constant line speed, but variable line speed) are held at the command speed and command tension by position control and torque bias compensation control. (2) The speed and tension during acceleration / deceleration can be controlled by speed feedforward control and acceleration feedforward control.
The command tension is maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIGS. Reference numeral 1 is a paper feed unit / infeed unit, 2 is a printing unit, 3 is a dryer unit, 4 is a cooling unit, 5 is a web path unit, and 6 is a folding machine, and these members are the same as those in the prior art. The paper feeding unit 1 and the infeed unit 1 supply the rolled paper to the line with proper tension, and the printing unit 2 prints multicolor printing. The dryer section 3 dries the printing ink with hot air. The cooling unit 4 reduces the temperature of the paper heated by the dryer unit 3. The web path section 5 stably feeds the running paper after the cooling section to the folding machine. The folding machine of 6 folds into various patterns.

Hereinafter, 1 to 6 will be referred to as each section. Figure 6
In the figure, 10 is an in-feed motor 11, a printing machine motor 12, a cooling section motor 13 and a web path motor 14 are folding machine motors. FIG. 1 is a control block diagram used for implementing the present invention, and has the same configuration for each section. Reference numeral 15 denotes a speed command value generation unit, which calculates a speed command value from a draw for maintaining an appropriate tension and a reference speed.
An integrator 16 integrates the speed command value to calculate the position command value. Reference numeral 17 is a position gain, 18 is a speed gain, and 19 is a current gain.

Reference numeral 20 is a torque bias compensating circuit for compensating a constant torque loss such as a fixed mechanical loss.
A constant voltage of 7 is generated. Reference numeral 21 is a differentiator, which differentiates the speed command value and generates an acceleration feedforward signal 29. Reference numeral 22 is a motor, and 23 is a roll of each section. 24 is a feedback signal of the motor current, 25 is a feedback signal of a speed detector attached to the motor, and 26 is a feedback signal of a position detector attached to the roll.

The velocity feedforward signal 28 is the same as the velocity command value in this embodiment. A conventional control block diagram is shown in FIG. 8 for comparison with the control block diagram according to the invention of FIG. 9 and 10 are examples of responses to which the control system of FIG. 8 is applied. The vertical axis represents the tension difference (set tension-actual tension), and the horizontal axis represents time. The purpose of control is to minimize the difference in tension.

In the figure, reference numeral 30 represents a tension difference 31 in the cooling section, reference numeral 32 represents a tension difference in the web path section, and reference numeral 32 represents a tension difference in the folder. Further, the speed command value is large in FIG. 9, and the speed command value is small in FIG.
Therefore, in the control systems of FIGS. 9 and 10 to 8, it is understood that when the speed command value is changed, the tension difference changes, which is not suitable for the purpose of control. 11 and 12 are examples of responses by the control block of FIG.

FIG. 2 shows a control system in which a torque bias compensating circuit is added to the speed control system, and a part of the control system of FIG. 1 is extracted. It can be seen that the tension difference in FIG. 12 is smaller than the tension difference in FIG. Note that FIG.
And the speed command value of FIG. 11 are the same, and the speed command values of FIG. 10 and FIG. 12 are the same. Also, the tension command value is shown in FIG. 9 and FIG.
0, FIG. 11 and FIG. 12 are the same.

13 and 14 are examples of responses by the control block of FIG. The control system shown in FIG. 3 is obtained by adding a torque bias compensation circuit to the position control system shown in FIG.
The speed command value of FIG. 13 is the same as that of FIG.
The speed command value of 4 is the same as the case of FIG. The tension command value is the same as in the case of FIG. 9 in both FIGS.

13 and 14 that the steady state tension difference is small. Although the difference in tension at the time of rising is large in FIG. 14, a steady characteristic (characteristic after the time is considered to be stable after time elapses) is discussed here, and therefore there is no problem. 15 to 18 are for judging the characteristics during acceleration / deceleration.

FIG. 15 is a trapezoidal speed command value for observing the acceleration / deceleration characteristics, where the vertical axis is the speed and the horizontal axis is the time. Figure 1
No. 6 is due to the control system of FIG. 3, and it can be seen that the tension difference increases due to acceleration / deceleration. FIG. 17 is based on the control system of FIG. 4, and the tension difference during acceleration / deceleration is considerably small except when switching between acceleration and deceleration.

FIG. 18 is based on the control system of FIG. 1, and the difference in tension during acceleration / deceleration is extremely small.

[0018]

INDUSTRIAL APPLICABILITY According to the present invention, in a sectional drive such as an offset rotary press having a motor for each section of a printing line, the control system of each section integrates a speed command value to calculate a position command value. A position gain, a speed gain, a torque bias compensation circuit, a differentiator that differentiates the speed command value to generate an acceleration feedforward signal, and a speed detector that is attached to the motor to generate a feedback signal, It is equipped with a position detector that is attached to a roll and generates a feedback signal.In steady state, position control and torque bias compensation control are used to adjust the speed and tension, and during acceleration / deceleration, speed feedforward control and acceleration feedforward control are used. Since the tension is adjusted, the actual tension can be set even if the speed command value is changed. It can be kept in force.

Therefore, it is possible to take advantage of the merits peculiar to the sectional drive, such as the suitability of the line arrangement and the downsizing of the equipment.

[Brief description of drawings]

FIG. 1 is a block diagram of a control system in an embodiment of the present invention.

FIG. 2 is a block diagram of a control system that is a part of the control system of FIG.

FIG. 3 is a block diagram of another control system that is a part of the control system of FIG.

FIG. 4 is a block diagram of another control system which is a part of the control system of FIG.

FIG. 5 is an overall side view of a general printing press line.

FIG. 6 is a schematic diagram of a sectional drive in a printing press line.

FIG. 7 is a schematic diagram of a line shaft drive in a printing press line.

FIG. 8 is a block diagram of a speed control system normally used conventionally.

9 is an example of a response by the control system of FIG.

10 is another response example by the control system of FIG.

11 is an example of a response by the control system of FIG.

FIG. 12 is another response example by the control system of FIG.

13 is an example of a response by the control system of FIG.

FIG. 14 is another response example by the control system of FIG.

FIG. 15 is a diagram of a trapezoidal speed command value for viewing acceleration / deceleration characteristics.

16 is a response example at the time of acceleration / deceleration by the control system of FIG.

17 is a response example at the time of acceleration / deceleration by the control system of FIG.

FIG. 18 is a response example at the time of acceleration / deceleration by the control system of FIG. 1.

[Explanation of symbols]

 15 Speed command value generator 16 Integrator 17 Position gain 18 Speed gain 19 Current gain 20 Torque bias compensation circuit 21 Differentiator 22 Motor 23 Roll of each section 24 Motor current feedback signal 25 Speed detector feedback signal 26 Position detector Feedback signal 27 Constant voltage 28 Velocity feedforward signal 29 Acceleration feedforward signal

Front page continuation (72) Inventor Nobuyuki Makioku 5007 Itozaki-cho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Mihara Works (72) Inventor Kiyoshi Shiramizu 5007 Itozaki-cho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd., Mihara Works

Claims (1)

[Claims] 1. In a sectional drive having a motor for each section of a printing line such as an offset rotary press, an integrator for integrating a speed command value to calculate a position command value in a control system of each section, and a position Gain, speed gain, torque bias compensation circuit, differentiator that differentiates speed command value to generate acceleration feedforward signal, speed detector that is mounted on motor and generates feedback signal, and mounted on roll Position controller that generates a feedback signal by adjusting the speed and tension by position control and torque bias compensation control in a steady state, and adjusts speed and tension by speed feed forward control and acceleration feed forward control during acceleration / deceleration. A sectional line drive device for a printing line, which is configured as described above.