JPH03238258A - Sheet winding control device - Google Patents

Abstract

PURPOSE:To uniform start-up of a winding roll speed and the rewinding roll speed for smooth sheet feed by setting an adequate acceleration rate automatically according to the winding diameter of the sheet coil on a rewinding roll to control speed. CONSTITUTION:The winding diameter of a sheet coil mounted on a rewinding roll 2 is computed from the rotating speed of a direct current control generator 14 for the rewinding roll by a diameter operation part 28, and the moment of inertia of the sheet coil is calculated from the winding diameter obtained by the diameter computation part 28 and a sheet input condition previously set by a GD<2> computation part 29. From the moment of inertia of the sheet coil calculated, the target acceleration rate of the rewinding roll 2 is calculated by an acceleration rate computation part 34 to control the sheet feed speed of the rewinding roll 12 based on the acceleration rate which is automatically set according to the remaining amount of the sheet coil. It is thus possible to make the start-up speed of the winding roll 1 coincide with the start-up speed of the rewinding roll 2 for the feed the sheet 3 feed without slackening.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a sheet winding control device suitable for application to a device that performs interlocking paper passing operation between a rewinding roll and a winding roll. Regarding improvements.

(Prior art) Generally, when introducing the sheet from the unwinding roll into the take-up roll or when connecting the sheets after the sheet breaks during winding operation, only the unwinding roll is operated independently and the sheet is After the sheet is fed out, the operator manually introduces the leading edge of the sheet into the take-up roll.

Incidentally, recent winding machines are equipped with an automatic paper threading device that uses air to thread the paper without bothering the operator. To control the winding machine at this time, it is necessary to operate the unwinding roll and the winding roll in conjunction with each other at the paper passing speed.

Hereinafter, the operation of this type of sheet winding control device will be explained using paper as an example. During normal winding operation, the winding roll is operated under speed control and the unwinding roll is operated under tension control. However, when a new roll is set or during paper feeding when a paper break occurs, the tension cannot be controlled by the rewind roll, so the speed of the rewind roll is also controlled. In this case, since the take-up roll is empty or has a smaller load than the unwind roll, an acceleration limiting device is used to increase the speed at a constant acceleration rate until the paper passing reference speed is reached. However, when the rewinding roll passes through an acceleration limiting device, the load is large and the acceleration torque is insufficient, resulting in a delay in reaching the specified speed.
As shown in Figure (a), the speed is controlled to match the reference speed of the winding roll. In the figure, A is the final paper passing speed.

On the other hand, on the unwinding roll side, the moment of inertia of the paper GD2
(G is the weight (kg), D is the roll diameter), so if the standard paper passing speed is set at the same acceleration rate as the take-up roll, sufficient initial acceleration torque will not be generated and the rise will be faster than the take-up roll. will be delayed.

Therefore, on the rewind roll side, the initial acceleration torque is generated by controlling the speed at the paper passing standard speed C which rises in steps as shown in Fig. 3(b), without using an acceleration limiting device. There is.

(Problem to be Solved by the Invention) However, in the speed control of the rewinding roll as described above, the GD2 for paper differs depending on the winding diameter on the unwinding side. The same initial torque is generated, and the rewind roll side rises faster than the take-up roll side.

As a result, in the sheet winding control device as described above, paper breaks occur during operation and the following problems occur when continuous paper feeding operation is performed for paper connection. In other words, the rewind roll rises faster than the take-up roll, so paper is fed out from the rewind roll by that amount, but the excess paper cannot be taken up by the take-up roll, causing the paper to sag. The paper gets caught in the slitter or gets scratched, or a paper jam occurs in the paper passing device.

This not only damages the product, but also necessitates the suspension of operation, and also causes trouble for the operator when it is time to restore the product.
There is a problem in that it takes a considerable amount of time to drive the paper.

The present invention was made to solve such conventional problems, and by automatically setting an appropriate acceleration rate according to the winding diameter of the sheet coil on the unwinding roll and controlling the speed, It is an object of the present invention to provide a sheet winding control device which aligns the speed rises of a take-up roll and a rewind roll and executes a smooth paper passing operation.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a sheet winding device that performs interlocking paper passing operation between a rewind roll and a take-up roll. In a sheet winding control device in which a DC braking generator is used for the return roll, the DC braking generator is driven by tension control during winding operation, and is driven by speed control during sheet passing operation, the rotational speed of the DC braking generator is a diameter calculating means for calculating the winding diameter of the sheet coil mounted on the unwinding roll; and calculating the moment of inertia of the sheet coil from the winding diameter obtained by the diameter calculating means and preset sheet input conditions. It is equipped with a GD2 calculation section and an acceleration rate calculation section that calculates a target acceleration rate of the rewinding roll from the moment of inertia of the sheet coil calculated by the GD2 calculation section, and is automatically set according to the remaining amount of the sheet coil. This configuration controls the paper passing speed of the rewind roll based on the acceleration rate.

(Function) By taking the above measures, the present invention calculates the moment of inertia of the sheet coil on the unwinding roll, and
Generates initial torque commensurate with the remaining amount of sheet coil during sheet feeding operation 1. By automatically setting the acceleration rate to be obtained, the start-up speed of the rewind roll matches the start-up speed of the take-up roll, and the paper passing operation is performed without sagging of the sheet.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the sheet winding control device of the present invention. In the figure, 1.1 is a winding roll, 2 is a rewinding roll, and the sheet 3 wound on the unwinding roll 2 is wound up by the winding rolls 1, 1.

The operation control of the winding rolls 1, 1 is divided into a winding operation and a paper passing operation. During the former winding operation,
a winding roll acceleration limiting device 7 that outputs a winding roll reference speed 6 according to the winding speed set by the winding speed setting resistor 4, the winding operator contact 5, and the winding speed setting resistor 4; A winding roll electric motor control device 9 that outputs a signal so that the speed detected by the winding roll speed detector 8 follows the winding roll reference speed 6 from the winding roll acceleration limiting device 7; This is carried out using a take-up roll electric motor 10, 10, etc., which rotates the take-up roll 11 in response to the output of the roll motor control device 9.

During the latter paper passing operation, the paper passing driver contact 11 is turned on to set the paper passing standard speed 1 set by the paper passing speed setting resistor 12.
3 is introduced into the winding roll acceleration limiting device 7, and the winding rolls 1, 1 are rotationally driven via the winding roll electric motor control device 9 and the winding roll electric motor 10 in the same manner as described above. ing.

On the other hand, on the unwinding roll 2 side, a DC braking generator 14 for the unwinding roll is used, and this DC braking generator 14 is driven by tension control during winding operation, and is driven by speed control during paper feeding operation. In other words, it is configured to be driven in conjunction with the winding rolls 1, 1. Specifically, during winding operation, the tension control device 23 outputs a tension control signal according to the deviation between the detected tension from the tension detector 21 and the set tension of the tension setting resistor 22, and the paper density setting resistor 22. 24° paper width setting resistor 25. The diameter calculation unit 2 uses input conditions such as the spool diameter setting resistor 26 and the unwinding roll speed detector 27.
GD to calculate the moment of inertia GD2 of the sheet coil on the unwinding roll 2 based on the winding diameter obtained through 8.
2 calculation section 29, an acceleration/deceleration compensation section 30 for rewinding roll,
A multiplication means 31 that multiplies the output of the tension control device 23 by the output of the rewind roll acceleration/deceleration compensator 30, a tension control type contact 32 that is turned on during tension control, and drives the rewind roll DC generator 13. DC generator control device 33 to control
This is done using

Next, during paper passing operation, an acceleration rate calculation section 34 calculates a target acceleration rate of the rewind roll 2 based on the paper passing reference speed from the paper passing speed setting resistor 12 and the output of the GD2 calculation section 29.
, a multiplier 35 for multiplying the winding diameter of the sheet coil obtained by the diameter calculation section 28 and the output of the speed detector 27 for the rewind roll, a speed control device 36 for the rewind roll 2, and a speed controller 36 for the rewind roll 2, which is turned on during speed control. This is done by using a speed control type contact 37 to control the rewinding roll, and a DC generator control device 33 to drive and control the DC generator 13 for the rewinding roll.

Next, the operation during winding operation in the apparatus configured as above will be explained. In this case, the winding driver detection point 5 is turned on, and the reference speed set by the winding speed setting resistor 4 is controlled by the winding roll motor control device 9 through the acceleration limiting device 7 and the winding roll motor control device 9. Electric motor 10.
By driving 10, the winding rolls 1, 1 are operated at a constant speed.

On the other hand, the rewinding roll 2 receives an acceleration/deceleration compensator 30 using the output of the acceleration limiting device 7 for the winding roll as a reference speed signal, and receives the winding speed obtained by the diameter calculation section 28 from the output of the tension detector 27. An acceleration/deceleration compensation signal is obtained using the diameter as a feedback signal, this is multiplied by the output of the tension setting resistor 22, and the rewind roll braking generator 13 is activated via the tension control type contact 32 and the DC generator control device 33. By driving, tension control operation is performed.

Next, the operation during paper passing operation will be explained. In this case, the paper passing driver contact 11 is turned on, and the paper passing speed setting resistor 12 is turned on.
Based on the reference speed set in , the take-up roll acceleration limiting device 7 controls the take-up roll electric motor so that it starts up at a constant acceleration rate until it reaches the final paper passing speed A, as shown in FIG. 2(a). By outputting the target speed to the device 9, the winding roll motor 10.10 is driven. The paper passing speed setting resistor 12 inputs the final paper passing speed A of the rewind roll shown in FIG. 2 to the acceleration rate calculating device 34.

At this time, in the GD2 calculation section 29, the paper density setting resistor 24
, paper width setting resistor 25 and spool diameter setting resistor 26
Based on the respective setting value signals input from the , and the winding diameter of the sheet coil input from the diameter calculation section 28
The moment of inertia of the sheet coil on the rewinding roll 2 is calculated and input to the acceleration rate calculating section 34.

This acceleration rate calculation unit 34 calculates a ratio between a preset moment of inertia of the sheet coil at full winding and the moment of inertia of the sheet coil at the time of paper passing, and calculates a target value that corrects the acceleration rate at full winding. The acceleration rate is determined and sent to the speed controller 36. From this speed control device 36, the speed control contact point 3
7. By driving the rewind roll DC generator 13 via the rewind roll DC generator control device 33, the rewind roll speed during paper passing is controlled as shown in FIG. 2(b). be able to. In FIG. 2(b), the paper passing reference speed C is the one when the roll is full, and 2 is the paper passing speed reference when the corrected target acceleration rate as described above is adopted. As the sheet coil diameter of the rewinding roll becomes smaller and the moment of inertia decreases, the target acceleration rate is made smaller and the paper passing reference speed 2 is corrected in the direction shown by arrow E.

Therefore, according to the configuration of the above embodiment, since the paper passing reference speed is automatically corrected in accordance with the sheet coil diameter on the rewinding roll 2, there is an advantage that paper passing can be carried out smoothly.

In the above embodiment, the sheet coil diameter is calculated from the unwinding roll speed measured by the speed detector 27, but the sheet coil diameter can also be directly measured using an optical sensor or a sensor that contacts the sheet coil surface. By doing so, the diameter calculation section 28 can be replaced, and the sheet coil diameter can be controlled more accurately.

[Effects of the Invention] As explained above, according to the present invention, the moment of inertia of the sheet coil on the rewinding roll is calculated by 1, and the paper passing reference speed is corrected so as to generate a motor torque corresponding to this moment of inertia. This makes it possible to start up paper at an appropriate speed regardless of the amount of remaining sheet coil, making it possible to prevent paper cuts, paper jams, and wasted paper, and improve the efficiency of paper threading work. can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention;
FIG. 2 is an explanatory diagram showing the change over time in the paper passing reference speed of the present invention, and FIG. 3 is an explanatory diagram showing the time change in the paper passing reference speed in the conventional apparatus. 1... Winding roll, 2... Rewinding roll, 3...
- Sheet, 4... Winding speed setting resistor, 5... Winding operator contact, 7... Acceleration limiting device for winding roll, 9
... Motor control device, 10... Motor for winding roll, 11... Paper passing driver contact, 12... Paper passing speed setting resistor, 13... DC braking generator for unwinding roll. ,
21... Tension detector, 22... Tension setting resistor, 2
4... Paper density setting resistor, 25... Paper width setting resistor, 26... Spool diameter setting resistor, 28... Diameter calculation section, 29... GD2 calculation section, 30... Addition Deceleration compensator, 31... Multiplier, 32... Tension control contact,
33... DC generator control device, 34... Acceleration rate calculating section, 35... Multiplying means, 36... Speed control device, 3
7...Speed control human contact.

Claims (1)

[Scope of Claims] A sheet winding device that performs interlocking paper passing operation between an unwinding roll and a take-up roll, wherein a DC braking generator is used for the unwinding roll, and the DC braking generator is used for winding operation. In a sheet winding control device that is driven by tension control at times and driven by speed control during sheet feeding operation, a diameter calculation is performed to calculate the winding diameter of the sheet coil attached to the unwinding roll from the rotational speed of the DC braking generator. a GD2 calculation unit that calculates the moment of inertia of the sheet coil from the winding diameter obtained by the diameter calculation unit and preset sheet input conditions; and a GD2 calculation unit that calculates the moment of inertia of the sheet coil calculated by the GD2 calculation unit. an acceleration rate calculation unit that calculates a target acceleration rate of the rewinding roll, and controlling the paper passing speed of the rewinding roll based on the acceleration rate that is automatically set according to the remaining amount of the sheet coil. Characteristic sheet winding control device.