JPH08231098A - Paper tension control device in paper feed section of rotary press - Google Patents

Abstract

PURPOSE: To correct the fluctuation of tension caused at the time of accelerating or decelerating a rotary press according to the diameter of a rolled paper. CONSTITUTION: In a paper tension control device composed of an electric tension detector 7; a control section connected to the detector 7; a booster amplifier 12 connected to the control section; an electropneumatic converter 13 connected to the booster amplifier 12; and an air brake device 4 connected to the electropneumatic converter 13, a rolled paper diameter detector 24 and an accelerated or decelerated speed detector 25 are connected to the control section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tension control device in a paper feeding section of a rotary press.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional paper tension control device in a paper feed section. A support shaft 3 on which a paper roll is mounted is rotatably attached to the ends of the arms of the pair of three arms 2 of the paper feed unit 1. An air brake device 4 is provided at the shaft end of the support shaft 3. The paper fed from the winding paper enters the infeed device (not shown) via the guide roller 5, the floating roller 6 and the tension detector 7.

The tension of the paper fed out from the paper roll fluctuates when the rotary press speed is further accelerated or decelerated due to the decrease of the paper roll outer diameter at the time of paper splicing and the normal operation, the defective roundness and the eccentricity. Therefore, the paper tension control device 16 is provided in order to suppress this fluctuation. As shown in FIG. 4, the paper tension control device 16 includes an electric tension detector 7, a control unit 8, a booster amplifier 12, an electropneumatic converter 13, and
The electro-pneumatic converter 13 including the air brake device 4 is connected to the air brake device 4 by the air circuit 15.

The control unit 8 stores the set tension, compares the set tension with the detected tension detected by the tension detector 7 and calculates a difference, and a gain for amplifying the difference amount from the circuit 9. 10 and a primary delay circuit 11 that suppresses sharp tension adjustment. The output from the primary delay circuit 11 is input to the electropneumatic converter 13, and the air pressure matching the input amount is supplied to the air brake device 4 from the air regulating valve 13a of the electropneumatic converter 13. Therefore, the brake torque that acts on the shaft 3 that supports the web is changed by the air brake device 4, and the tension that acts on the outer diameter of the web at this time is adjusted.

Note that 14 (1 / r) indicates that the value is divided by the instantaneous radius v of the paper roll that changes from moment to moment. In the figure, 17 is a filter, 18 is an air reservoir, and 19 is a pressure reducing valve.

[0006]

In order to prevent the paper from vibrating due to a sharp change in the tension of the paper, the primary delay circuit suppresses the tension adjustment sensitively. However, when acceleration or deceleration of the rotary press, as shown in FIG. 2, for example, when accelerating begin, GD ² (inertia) of the web
Therefore, the tension temporarily increases sharply and then returns to the original set tension, and at the time when acceleration reaches a constant speed, the tension temporarily decreases sharply and returns to the original set tension. The deceleration is the opposite of the acceleration.

Due to the increase or decrease in tension due to this acceleration / deceleration, it is possible that the paper is cut or flutters to cause printing failure. The present invention was developed in order to address such problems, and it is possible to reduce fluctuations in paper tension that occur during acceleration / deceleration of a rotary press.
The purpose is to calculate the required torque correction amount according to the diameter of the paper roll and feed it forward to the output side of the tension controller.

[0008]

The structure of the present invention for achieving the above object is an electric tension detector, a control unit connected to the electric tension detector, and a booster amplifier connected to the control unit. And a paper tension control device comprising an electropneumatic converter connected to the booster amplifier and an air brake device connected to the electropneumatic converter, wherein a winding paper diameter detection device and an acceleration / deceleration detector are connected to the control unit. It is characterized by having done.

[0009]

According to the present invention, tension fluctuations during acceleration / deceleration of the rotary press are immediately corrected by the above means, and a necessary torque correction amount (acceleration / deceleration torque of the web) corresponding to GD ² which changes depending on the diameter of the web is obtained. Calculate or input in advance for each paper thickness and width of the paper roll, derive the required torque correction amount from the graph of the set paper roll diameter and brake correction amount, and feed this torque correction amount to the output side of the primary delay circuit. Forward addition Add this output to the brake device via the booster amplifier and electropneumatic converter to suppress tension fluctuation during acceleration / deceleration.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. In the figure, reference numeral 20 denotes a paper tension control device, which is the conventional paper tension control device 1 shown in FIG.
6, an electric tension detector 7, a control unit 8 connected to the electric tension detector 7, a booster amplifier 12 connected to the control unit 8 and an electropneumatic air connected to the booster amplifier 12. It is composed of a converter 13 and an air brake device 4 connected to the electropneumatic converter 13.

In the present invention, the control unit 8 is
Drawer diameter detecting device 24, acceleration / deceleration detector 25, and a drawing device for calculating a correction torque or drawing a memorized web diameter from a graph of the amount of correction torque (set by the width size of the wrapping paper) 23 and the withdrawing device 23 is connected to the output side circuit 22 of the primary delay circuit 11 of the controller 8. Thus, the correction torque of the pull-out device 23 is feed-forwarded and input, and added to the output from the primary delay circuit 11 to instruct the electro-pneumatic converter 13 via the booster amplifier 12 to supply the corrected pneumatic pressure with an electric quantity (voltage V). Therefore, the electropneumatic converter 13 supplies the air pressure according to this instruction to the air brake device 4, so that the brake torque acting on the support shaft 3 changes, and the tension due to the acceleration / deceleration of the rotary press that occurs on the paper fed from the web. Eliminate the increase and decrease of.
The paper tension after being released in this way is measured by the tension detector 7
Is detected at and sent to the comparison circuit 9.

[0012]

As described above, according to the present invention, since the winding paper diameter detection device and the acceleration / deceleration detector are connected to the control unit of the paper tension control device, the paper tension that occurs during the acceleration / deceleration of the rotary press. The fluctuation is calculated by the paper diameter and the acceleration / deceleration, or it is picked up from the graph of the paper diameter and the correction brake amount, and the necessary correction braking force is output. It is possible to suppress fluctuations in the paper tension that occur during acceleration / deceleration in response to the above. Further, the correction of the tension fluctuation in the paper feeding unit during the normal constant speed operation is not performed sharply as in the past, but is performed after one breath.

[Brief description of drawings]

FIG. 1 is a diagram showing a control system of the present invention.

FIG. 2 is a graph of rotary press speed, paper tension fluctuation, and brake correction amount in FIG.

FIG. 3 is a schematic view of a conventional paper tension control device.

FIG. 4 is a diagram showing a conventional control system.

[Explanation of symbols]

 4 Air Brake Device 7 Electric Tension Detector 8 Control Unit 12 Booster Amplifier 13 Electropneumatic Converter 20 Paper Tension Control Device 24 Winding Diameter Detection Device 25 Acceleration / Deceleration Detector

Claims (1)

[Claims] 1. An electric tension detector, a control unit connected to the electric tension detector, a booster amplifier connected to the control unit, an electropneumatic converter connected to the booster amplifier, and the electropneumatic conversion. In a paper tension control device comprising an air brake device connected to a press, a paper tension control device in a paper feed part of a rotary press, wherein a winding paper diameter detection device and an acceleration / deceleration detector are connected to the control part. .