JPH0531943U - Tension control device for rotary press - Google Patents

Abstract

(57) [Abstract] [Object] The present invention is a tension control device capable of keeping the tension of running paper constant even if the pressure of the air cylinder acting on the dancer roller provided in the infeed portion of the rotary press fluctuates. Is provided. In a device for controlling the tension of running paper by a dancer roller provided in an infeed portion of a rotary press and an air cylinder that pressurizes the dancer roller, a tension fluctuation of the running paper caused by a pressure change of the air cylinder is corrected. A tension control device for a rotary press provided with a feedback circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing tension fluctuation by a dancer roller provided in an infeed part of a rotary press.

[0002]

[Prior Art]

 FIG. 2 shows a tension control device for a rotary press. The running paper fed out from the winding paper mounted on the support shaft 2 of the paper feeding unit 1 passes through the floating roller 3 and the electric tension detector 4, and the infeed roller 6 of the infeed unit 5 and the electric tension detector 4. 10. After passing through the dancer roller 8 pressurized by the air cylinder 7, the printing unit 9 further carries the drag roller 11 at the entrance of the folding machine 12.

Tension control in the paper feeding unit 1 is performed by a shaft end brake 13 acting on the support shaft 2, an electric tension detector 4, and a reel stand tension control device 14 to make the tension of the running paper substantially constant. . The tension of the running paper which has become almost constant becomes constant by the tension control in the infeed section 5. Conventionally, the tension control of the running paper in the infeed section 5 has been performed by infeed roller 6, continuously variable transmission (PIV) 21, pilot motor 22, air cylinder 7, dancer roller 8, dancer roller displacement detector 23, and electric tension detection. And an infeed tension control device (hereinafter simply referred to as a control device) 24.

When the tension of the traveling paper is set due to the thickness of the paper quality paper, this value is input to the control device 24. This input value is amplified by the amplifier 25, enters the electropneumatic converter 26, and is converted into an air pressure equivalent to the amplified value (electric quantity). This air pressure acts on the air cylinder, and the weight of the dancer roller 8 is applied to the running paper. Give tension. The flow diagram of the above tension control system is shown in Fig. 3.

When the tension of the running paper between the infeed roller 6 and the printing unit 9 changes, the dancer roller 8 moves vertically from the neutral position. When this movement amount is detected by the dancer roller displacement detector 23 and sent to the control device 24, the control device 24 rotates the pilot motor 22, minutely changes the reduction ratio of the PIV 21, and changes the rotation speed of the infeed roller 6. The dancer roller 8 is returned to the neutral position. However, the tension of the running paper depends on the weight of the dancer roller 8 and the air pressure acting on the air cylinder 7, and is not related to the vertical movement of the dancer roller 8. The tension detected by the electric tension detector 10 is only displayed on the controller 24.

[0006]

[Problems to be solved by the device]

 Even if the pressure supplied to the air cylinder of the dancer roller is supplied from the electropneumatic converter, the pressure of the air in the air cylinder shifts the vertical direction of the dancer roller and the lap sensitivity of the air supply valve that sends the adjusted air pressure to the air cylinder. It slightly fluctuates due to the operating sensitivity of the air supply valve (valve in the air section of the electropneumatic converter) that acts to restore the pressure reduced by leakage or the like. As a result, the tension of the running paper also fluctuates slightly and printing defects such as misregistration may occur.

An object of the present invention is to provide a tension control device capable of keeping the tension of running paper constant even if the pressure of an air cylinder acting on a dancer roller provided in an infeed portion of a rotary press changes. Is to

[0008]

[Means for Solving the Problems]

 Provide a feedback circuit for tension correction in the running paper tension control system of the infeed device so that the tension is kept constant even if the pressure in the air cylinder of the dancer roller fluctuates.

[0009]

[Action]

 The tension of the running paper detected by the electric tension detector at the exit of the infeed roller is fed back and compared with the set tension, so if there is a difference, this value is converted to electropneumatic conversion via the amplifier. The tension of the running paper is kept constant by operating the device and changing the pressure of the air cylinder.

[0010]

【Example】

 FIG. 1 shows a control device for a rotary press according to the present invention. When the tension set in the control device 24 is input, it is amplified by the amplifier 25, and converted by the electropneumatic converter 26 into air pressure corresponding to the amplified value (electric quantity). This air pressure acts on the air cylinder 7 to apply tension to the running paper together with the weight of the dancer roller 8 as in FIG. 3, but the tension of the running paper thus applied is applied to the electric tension detector. When the tension is detected by 10 and sent to the control device 24, this tension is returned to the input side of the amplifier 25 by the feedback circuit, compared with the set tension, and if there is a difference, the electropneumatic converter 2 passes through the amplifier 25. 6 is operated to change the air pressure acting on the air cylinder 7. Therefore, the tension of the running paper becomes constant at the dancer roller 8.

[0011]

[Effect of the device]

 The tension control device for a rotary press according to the present invention is a device for controlling the tension of a running paper by a dancer roller provided in the infeed part of the rotary press and an air cylinder for pressurizing the dancer roller. The following effects are obtained by providing a feedback circuit that corrects the tension fluctuations of the running paper caused by the above.

[0012] Even if the pressure of the air cylinder acting on the dancer roller that is provided in the infeed portion of the rotary press and that keeps the tension of the running paper constant, the tension is always kept constant. Does not happen.

[Brief description of drawings]

FIG. 1 is a flow diagram of a control system according to an embodiment of the present invention.

FIG. 2 is a side view showing an example of a control system of a rotary press.

FIG. 3 is a flow diagram of a tension control system of a conventional rotary press.

[Explanation of symbols]

 8 Weight of dancer roller 10 Tension detector 24 Tension control system by dancer roller 25 Amplifier 26 Electro-pneumatic converter

Claims (1)

[Scope of utility model registration request] 1. A device for controlling the tension of a running paper by a dancer roller provided in an infeed part of a rotary press and an air cylinder for pressing the dancer roller, wherein the tension of the running paper caused by a pressure change of the air cylinder. A tension control device for a rotary press, comprising a feedback circuit for correcting fluctuations.