JPH0553705B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for suppressing tension fluctuations during rewinding in an apparatus for winding a long material at a constant tension.

[Conventional technology]

For example, when winding up a long material such as paper or film onto a take-up roll, it is necessary to wind it at a constant tension in order to prevent distortion or the like from occurring in the long material.

A typical winding device system is shown in FIG. This winding device system has two winding rolls, an A-axis winding roll 1 and a B-axis winding roll 21, and the A-axis winding roll 1 winds a long material to a specified diameter. When the winding is over, the B-axis winding roll 21 is re-wound so that the feeding and winding process of the long material is not interrupted.

This rewinding process is shown in FIG. 19A in the figure,
19B is a guide roll, 20 is a turret motor, 17 is a tension detector, and 23 is an enveloper. First, as shown in FIG. 4a, when the A-axis take-up roll 1 reaches the specified diameter, the turret electric motor 2
0 to move the turret as shown in Figure 4b.
Rotate 180 degrees. At this time, the long material is still wound up on the A-axis winding roll 1. next,
The B-axis take-up roll 21 is rotated at a speed corresponding to the speed of the long material, the enveloper 23 is lowered, and the long material is wound around the outer periphery of the B-axis take-up roll 21 as shown in FIG. 4c. do it like this. Next, when the long material is cut with the cutter knife 24, the long material is re-wound onto the B-axis take-up roll 21 side. After that, the enveloper 23 is raised and returned to its original position.

[Problem that the invention seeks to solve]

When rewinding a long material using such a rewinding process, it is necessary to rewind the long material during the rotation of the turret, that is, as shown in Fig. 4a.
During the transition from state b to state b, or when enveloper 2
During the lifting and lowering of step 3, the path length of the long material changes, so
It appears that the line speed has changed, and the tension fluctuates.

By the way, the required output T _P of the electric motor of the winding device is expressed as follows.

T _P = T _EN × (V _L + ΔV) / 6120 × η / 100 (KW)……(
1) However, T _EN : Tension (Kg) V _L : Line speed (m/min) ΔV : Line speed conversion for path length change (m/min) η : Mechanical efficiency (%) Here, line speed for path length change It is clear from equation (1) that if the converted ΔV cannot be accurately grasped, the tension will not be as set.

In the past, a constant value was used for ΔV because calculating the path length, which changes from moment to moment, would be too complicated and impractical. the result,
It was not possible to compensate for tension fluctuations during rewinding, and it was difficult to suppress the occurrence of distortion in the long material.

Particularly in the case of a long material such as paper or film, this tension fluctuation causes adverse effects such as distortion, scratches, and wrinkles on the long material, resulting in problems such as product defects.

The present invention was made in view of the above circumstances, and an object of the present invention is to perform control to maintain a constant tension on a long material by automatically correcting tension fluctuations during rewinding. .

[Means for solving problems]

In order to achieve this objective, a method for compensating for tension fluctuations during rewinding of a winding device according to the present invention is applied to a winding device that continuously winds a long material at a constant tension. The tension fluctuations of the long material during rewinding from the roll to the empty take-up roll are memorized in chronological order, and when the next rewinding is performed, the tension fluctuations of the previous time can be canceled out. It is characterized by performing compensation to keep the tension of the long material constant during rewinding.

[Effect]

In the present invention, fluctuations in the tension of the long material during rewinding are stored moment by moment. At the time of the next rewinding, a tension fluctuation compensation value is calculated from the stored tension fluctuation value, and compensation is performed at each time point based on the calculation result. Thereby, even during the rewinding operation, it is possible to always wind up the elongated material with a constant tension.

Note that the tension fluctuation compensation value is corrected each time based on the detected tension value.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 is a flowchart of an embodiment of a method for compensating tension fluctuation during rewinding of a winding device according to the present invention;
FIG. 2 is a block diagram showing an example of the configuration of a winding device that performs tension fluctuation compensation according to the present invention, and FIG. 3 is a block diagram showing the configuration of the winding device after rewinding.

In FIGS. 2 and 3, reference numeral 1 denotes the previously described A-axis winding roll, which is driven by an A-axis electric motor 2. In FIG. The rotational speed is detected by the A-axis speed detector 3. Further, the rawness of the long material is detected by the long material speed detector 15, and the long material speed signal 16 is input to the A-axis tension controller 8. This A-axis tension controller 8 uses a set torque T _REF set by a tension setting device 9, a long material speed signal 16, and a long material tension signal detected by a long material tension detector 17. 18 to calculate the tension command signal. On the other hand, the long material speed signal 16 is A
It is compared with the A-axis speed feedback signal 11 detected by the shaft speed detector 3, and the deviation thereof is calculated by the A-axis speed controller 12 and output as the A-axis torque command 10. The A-axis switching device 5 switches between the A-axis winding mode contact 6 and the A-axis speed control mode contact 7, and outputs either command to the A-axis current controller 4 to drive the A-axis electric motor 2.

During normal line operation, the take-up mode is used, and when the take-up machine is to be operated at full size or reverse size, it is controlled by switching to speed mode.

In addition, 22 is a B axis that drives the B-axis winding roll 21.
This is a shaft electric motor, and its torque and speed control device is the same as the configuration of the A-axis, so a description thereof will be omitted.

The tension fluctuation compensation according to FIG. 1 will be explained with reference to FIG. 2. First, when rewinding is started while the A-axis electric motor 2 is driving the A-axis take-up roll 1, the clock timer _t1 installed in the A-axis tension controller 8 starts measuring time. In the rewinding tension fluctuation compensation circuit in the A-axis tension controller, the tension fluctuation compensation data number is set to an initial value of 1, and the corresponding compensation value is read into T _i . Next, in the tension command calculation circuit in the A-axis tension controller 8, the tension command T _{REF is}
Add the tension fluctuation compensation value to . At the same time, the rewinding tension variation compensation circuit in the A-axis tension controller 8 calculates the variation based on the difference between the tension command and the detected tension value, and corrects the tension variation compensation data.

Thereafter, in the same manner, after the sampling time Δt has elapsed, the tension fluctuation compensation data number is incremented to compensate for the tension fluctuation and correct the data. Since the rewinding time is usually 15 to 30 seconds, the sampling time Δt may be set in approximately 0.5 second increments.

FIG. 5 shows an example of a pattern of tension fluctuation compensation values for each sampling time.

When rewinding the take-up roll next time, the A-axis tension controller 8 and the B-axis tension controller read out the tension fluctuation compensation data stored in the memory in this controller at each sampling time Δt. By changing the tension command during rewinding, fluctuations in the tension of the long material are suppressed.

〔Effect of the invention〕

As described above, in the present invention, data for compensating tension fluctuations during rewinding in time series is provided to compensate for tension fluctuations, and at the same time, the tension fluctuation compensation data is corrected based on the detected tension value at that time. I have to. This makes it possible to reduce tension fluctuations during rewinding and control the occurrence of distortion in the long material, which is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an example of the procedure for compensating for tension fluctuations according to the present invention, FIGS. 2 and 3 are block diagrams of a general winding system, FIG. 4 is an explanatory diagram of the rewinding process, and FIG. The figure is a graph showing an example of the tension fluctuation compensation value for each sampling time. 1: A-axis winding roll, 2: A-axis electric motor, 3: A
Axis speed detector, 4: A-axis current controller, 5: A-axis switcher, 6: A-axis winding mode contact, 7: A-axis speed control mode contact, 8: A-axis tension controller, 9: Tension setting device , 10: A-axis torque command, 11: A-axis speed feedback signal, 12: A-axis speed controller, 15:
Long material speed detector, 16: Long material speed signal, 1
7: Long material tension detector, 18: Long material tension signal,
19, 19A, 19B: Guide roll, 20: Turret electric motor, 21: B-axis winding roll, 2
2: B-axis electric motor, 23: enveloper, 24: cutter knife.

Claims (1)

[Claims] 1 In a winding device that continuously winds a long material at a constant tension, the tension of the long material during the process of rewinding the long material from a winding roll that has been wound up to a specified diameter to an empty winding roll. A winding device characterized by storing fluctuations in chronological order and performing compensation to cancel out the previous tension fluctuations at the time of the next rewinding to keep the tension of the long material constant during rewinding. A method for compensating for tension fluctuations during rewinding.