JPH01167157A - Tension control compensator - Google Patents

Abstract

PURPOSE:To perform tension control from the time of paper passage operation and also at the time of shifting to manufacturing operation and to automatically make a tension setting value optimum by employing a paper passage width setter, an operation width setter, a tension calculator, a changeover device, a paper making speed setter, a paper passage end signal circuit, and a changeover signal calculator. CONSTITUTION:A paper passage width setter 14 is provided for setting the width of a narrow paper sheet 4 at the time of passing the paper sheet by means of a paper passage end signal circuit 11 at the time point when the paper sheet 4 is caught with a winder 5. By means of a signal from the setter 14, an output signal from a tension calculator 12 is added as a compensation value to a speed reference signal 18. Then, when the paper sheet 4 is changed to a wider paper width for a manufacturing operation, a changeover is performed between a setting value of the setter 14 and a setting value of an operation width setter 15 for setting a wider width of the paper sheet 4 at the time of manufacturing operation inputted to the tension calculator 12 by means of a manufacturing signal 19 and a paper making speed setter 17. An input of the calculator 12 is changed to a signal of the setter 15 by means of a changeover signal calculator 16 for starting calculation of the timing for actuating a changeover device 13. As a result, a tension necessary at the time of manufacturing is applied to the paper sheet 4.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an electric motor drive device for a paper machine.

(Prior Art) Conventional tension control and correction devices are used only during operation, and when paper is fed, the speed setting device is set to the optimum speed that does not cause paper slack or paper breakage. In addition, when changing from normal operation to operating operation by widening the paper width, increase the paper width while maintaining speed control, visually confirm that the paper width has been completely widened, and set the tension setting device to the optimum value. The work involved manually switching from speed control to tension control.

(Problems to be Solved by the Invention) Conventional paper passing operation was performed by speed control, so if the operation was not performed at the optimum speed, paper sag or two pieces of paper may occur. When changing to operational operation after unrolling, it was necessary to manually set the tension setting device to the optimum value and then switch from speed control to tension control, which could lead to incorrect settings or operations.

The present invention performs tension control from the time of paper feeding operation, and the paper sag is reduced by 9.
It is an object of the present invention to provide a tension control correction device that prevents the occurrence of paper breakage and automatically sets a tension setting value to an optimum value even when changing from paper passing operation to operation operation.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a paper passing width setting device for setting the paper width during paper passing, an operating width setting device for setting the paper width during operation, and a paper passing width setting device for setting the paper width during paper passing. A tension calculator that calculates a tension control correction signal from the signal of the paper width setter or the operating width setter, a switch that switches the signal of the paper passing width setter and the signal of the operating width setter, and a machine speed that is set during operation. The machine speed setting device, the paper passing completion signal circuit that is output when the paper passing is completed, and the operation signal input from the outside when the paper passing operation is changed to the operation operation, and the operation signal and the machine speed setting device. A tension control correction device is provided that includes a switching signal calculator that calculates the timing for operating a switch that switches between a signal from a sheet passing width setting device and a signal from an operating width setting device based on a signal.

(Function) The tension setting value during paper passing or operation is 1 given to 2 sheets of paper width.
-Determined by the tension of the hit.

TB ... (Formula 0, where T is the tension setting value, W is the paper width, and T'B is the tension per unit length applied to the paper. Therefore, once the paper width is determined,
The tension setting value can be calculated using the formula O).

Next, the timing for switching from the tension setting value during paper feeding to the tension setting value during operation is after the time determined by the following formula after the operation signal that is output when changing from paper feeding operation to operation operation is input. All you have to do is operate the switch.

Here, t is the time for outputting the switching signal, L is the path length from the paper width control device to the roll that performs tension control, ■ is the speed, and K is the margin time.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. The dry part of a paper machine generally consists of dryer rolls 31 to 33.
, a calendar roll 2, and a reel roll 3, and the paper 4 rotates by contacting the reel roll 3, and is wound up by a winder 5 that winds up the paper 4.

The reel roll 3 is driven by an electric motor 10, and the electric motor 10 includes a power source 6 that supplies electric power, a current transformer 7 that detects alternating current,
A rectifier 8 that converts alternating current into direct current, a contactor 9 that opens and closes the direct current output from the rectifier 8, and a control unit 20 that controls the rectifier 8.
Consists of. The rotation speed is controlled by an SCR control device.

When passing the paper 4 through the paper machine and winding the paper 4 around the winder 5, the paper 4 is operated with a narrower width than during operation, and the winder 5
When the winding is completed, the width is changed to the wide width for operational use. In this series of operations, the SCR control device is controlled as follows.

First, before the paper 4 is wound up by the winder 5, the circumferential speed of the reel roll 3 and the circumferential speed of the calendar roll 2 are the same, or the circumferential speed of the reel roll 3 is the circumferential speed of the calender roll 2. The speed control operation is performed using a speed reference signal 10 that controls the rotation speed of the electric motor 10 so that the rotation speed becomes somewhat faster than the speed. Next, when the paper 4 is wound around the winder 5, a paper passing completion signal circuit 11 inputted from the outside causes a paper passing setting device 14 that sets the width of the thin paper 4 at the time of paper passing, and a paper passing width. Tension calculator 12 calculates the tension applied to the paper 4 based on the signal from the setting device 14
By configuring a tension correction circuit that adds the output signal from the speed reference signal 18 as a correction value, a certain tension determined by the calculation of the tension calculator 12 is applied to the paper 4, and the paper 4 is moved by the winding machine due to this tension. 5.

Next, when the paper 4 is changed to a wide paper width for operation, the paper passing width setting is input to the tension calculator 12 by the operation signal 19 input from the outside and the paper machine speed setting device 17 that sets the paper machine speed. a switching signal calculator 16 that starts calculating the timing to operate the switching device 13 that switches between the setting value of the device 14 and the setting value of the operating width setting device 15 that sets the width of the wide paper 4 during operation;
As a result, the input of the tension calculator 12 is switched to the signal of the operating width setting device 15, the tension necessary for the operation is applied to the paper 4, and the operation is continued in this state.

〔Effect of the invention〕

According to the present invention, it is possible to prevent the occurrence of paper sag and paper breakage during paper passing, and also to automatically set the tension setting value to the optimum value even when the paper passing operation is changed to the operating operation. Operation can be prevented.

[Brief explanation of the drawing]

The drawing is a configuration diagram of a tension control correction device showing an embodiment of the present invention. 11...Paper passing completion signal circuit 12...Tension calculator 1
3...Switcher 14...Paper passing width setting device 1
5... Operating width setting device 16... Switching signal calculator 17... Paper speed setting device 18... Speed reference signal 19... Operating signal agent Patent attorney Noriyuki Chika

Claims (1)

[Claims] A paper passing width setting device that sets the paper width during paper passing, an operating width setting device that sets the paper width during operation, and a tension calculation that calculates a tension control correction signal from the signal of the paper passing width setting device or the operating width setting device. a switching device that switches the signal of the paper passing width setting device and the signal of the operating width setting device, a paper speed setting device that sets the papermaking speed during operation, and a paper passing device that outputs when paper passing is completed. A completion signal circuit, an operation signal input from the outside when changing from paper passing operation to operation operation, and a signal of the paper passing width setting device and a signal of the operation width setting device from the operation signal and the signal of the machine speed setting device. A tension control correction device comprising a switching signal calculator that calculates the timing of operating a switching device that switches signals.