JPS5936063A - Winding tension control method of sheet-shaped article - Google Patents

Abstract

PURPOSE:To make it possible to accurately control winding tension by substantially making a touch roll in contact with a winding roll to be a free roll and enabling sheet tension to be accurately detected just before the touch roll. CONSTITUTION:The tension of a film 1 is detected at a guide roll 3 position just before a touch roll by means of a tension detecting device 8. Here, the touch roll 4 is made to be a free roll, and driven with the same peripheral speed as that of a winding roll 5, so that the winding tension of the film 1 wound round the winding roll is accurately detected without its attenuation. The torque of the winding roll 5 is controlled based on this detected value via a control device 7 and a driving device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the winding tension of a sheet-like material such as a film in a slitter that winds the sheet-like material onto each take-up roll while cutting it into strips. The present invention relates to a method for controlling the winding tension in a slitter that winds up a take-up roll while bringing it into contact with a common touch roll.

Generally, in a slitter, the winding tension of the sheet material is controlled by controlling the drive torque of the winding roll, but in order to control the winding tension to a more accurate value in line with the target value, It is desirable to control the drive torque of the take-up roll while actually detecting the take-up tension of the take-up roll.

Conventionally, in a slitter of the type that winds a sheet 1 to 1 while bringing all the winding rolls into contact with one touch roll,
Since each take-up roll is in contact with the touch roll and it is not possible to detect the winding tension itself of the sheets 1 to 2 that are wound up on the take-up roll, a tension detection roll is installed before the touch roll to check the tension of the sheet. was detected. However, since the touch roll was equipped with a drive device on the touch roll itself, the winding tension of the material is transmitted from the take-up roll to the tension detection roll via the touch roll. The detected tension did not correspond accurately to the winding tension at the position of the winding roll. Therefore, the conventional winding tension control method of controlling the drive torque of the winding roll based on the tension detected by the tension detection roll has its own limits in accuracy.

The present invention aims to accurately control the winding tension of a sheet material to a target value in order to solve the problems of the conventional method described above.

In order to achieve this objective, in the sheet-like material winding tension control method of the present invention, the touch roll is substantially made into a free roll, so that the influence of the touch roll driving force on the sheet-like material tension is reduced. The winding tension is directly transmitted to the sheet-like object immediately before the touch roll, and the tension of the sheet-like object immediately before the touch roll is detected and the drive torque of the take-up roll is controlled based on the detected tension. The winding tension of the ~ shaped article is controlled. In other words, in practice, free roll means that even when the touch roll is driven to cancel mechanical loss of the touch roll, the surface drive is mainly performed by the take-up roll, and the circumferential speed of the take-up roll and the touch roll are match, and the touch roll always follows the take-up roll.

In this tension control method, since the tension having the same value as the actual winding tension at the position of the winding roll is detected just before the touch roll, the same value as the target winding tension is applied to the sheet material just before the touch roll. By controlling the driving torque of the winding roll so that a certain tension is applied, the actual winding tension of the sheet 1 can be accurately controlled to the target tension.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for controlling the winding tension of a sheet-like material according to the present invention will be described below with reference to the drawings.

1 and 2 show an apparatus for carrying out a method according to a first embodiment of the invention.

In the figure, reference numeral 1 indicates a strip-shaped film as a sheet-like object cut into a plurality of pieces in the width direction. The film strip 1 is wound up on a latter winding roll 5 guided by a guide roll 2.3. Each take-up roll 5 has one common touch roll 4
is being forced on. Reference numeral 6 denotes a motor as a rotational drive device for the take-up roll 5, and the rotation of the motor 6 is transmitted to the take-up roll 5 by a belt 9.

The guide roll 3 is provided at a position immediately in front of the touch roll 4 in the film 1 feeding direction, and the guide roll 3 is provided with a torque detector 8 as a tension detection device for detecting the tension of each strip film 1. . The tension detection device @8 is connected to the input section of the control device @7, which includes a microcomputer or the like. The control device 7 compares and examines the tension from the tension detection device 8 with a target value, and controls the drive device 6 of each winding roll 5.
, a signal is output in order to generate a torque that brings the tension closer to the target value.

Therefore, the drive position 6 of each winding roll 5 and the control device 7 are connected to each other.

The tension control method of the first embodiment using the above device is carried out as follows. After the film 1 is cut in the width direction, it is sent toward the take-up roll 5, and the tension is detected from the drive torque of the guide roll 3 by the tension detection device 8 at the guide roll 3 immediately before the touch roll 4. The touch roll 4 is a free roll and is driven by the take-up roll 5 and the film 1 wound around the touch roll 4 at the same circumferential speed as the take-up roll 5. The winding tension of the film 1 being wound around the winding roll 5 is transmitted without attenuation. The detection signal of the tension of the film 1 immediately before the touch roll 4 is sent to the control till FF 7, where it is compared with the target value of the winding tension, and when the detected tension is smaller than the target value, the torque of the winding roll 5 is increased. When the detected tension is greater than the target value, the take-up roll 5
A signal that reduces the torque of the take-up roll 5 drive device 6
output towards. The torque of the take-up roll 5 is controlled by this signal. The tension of the same value as the winding tension is detected just before the touch roll 4, and the driving torque of the winding roll 5 is controlled based on the detection signal, so that the tension of the strip film 1 wound on the winding roll 5 is Tension is controlled. By repeating this control, the winding tension of the strip film 1 is controlled to approach the target value as much as possible. FIG. 3 shows an apparatus for carrying out a method according to a second embodiment of the invention. In this device, the device for detecting the tension of the sheet-like material 1 consists of rotation speed detectors 10 and 11 provided on the touch roll 4 and the idle roll 3.

That is, by knowing the rotational speed of the touch roll 4 and the guide roll 3, the circumferential speed ratio of both rolls 4.3 can be known, and this circumferential speed ratio and the tension of the seam 1-shaped object 1 are correlated with each other. The tension of the sheet 1 is detected by detecting the number of revolutions. The rotation speed detectors 1o and 11 are connected to the control device 7.

In the method according to the second embodiment of the present invention using this device, the tension of the sheet material 1 is first detected by the rotation speed detectors 1o and 11, the control device 7 compares and calculates the tension with a target value, and A signal is output to the drive device 6 of the sheet material 1 to control the tension of the sheet material 1 to match the target value. Other configurations,
Since the operation is similar to that of the first embodiment, similar parts are given the same reference numerals as in FIG. 2, and a description thereof will be omitted.

Note that in the first and second embodiments, the touch roll 4
The winding tension is detected through the torque or circumferential speed of the guide roll 3 immediately before the winding. You may return the tension detection roll. In this case, all the rolls between the upstream detection roll and touch roll 4 are treated as free rolls, and the tension detected by the detection rolls is added to the tension detected by the detection rolls by a constant v1 machine 0s of the free rolls. This makes it possible to detect the winding tension. In addition, in the above embodiment, a method was explained in which all the winding rolls come into contact with one common touch roll, but as shown in FIGS. 4 and 5, two touch rolls are provided and each touch roll is A method in which a plurality of take-up rolls are in contact with each other may also be adopted.

As described above, in the method of the present invention, the touch roll is a free roll, the tension of the sheet is detected just before the touch roll, and the tension is controlled based on the tension. The effect is that the tension can be accurately controlled to a target tension.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the winding section of a slitter according to a first embodiment of the method of the present invention, FIG. 2 is a side view of the apparatus of FIG. 1, and FIG. FIG. 4 is a side view of a winding section of a slitter according to another embodiment for carrying out the method of the present invention; FIG. FIG. 5 is a plan view of the apparatus shown in FIG. 4. 1...Sheet-like material 2.3...Guide roll 4...
...Touch roll 5...Take-up roll 6...Take-up drive motor 7...
...Control device 8...Torque detector 9 as tension 1ξ output device...Bell 1-10.11...... Figure 5: Rotation speed detector as a detection device

Claims (3)

[Claims] (1) While cutting the sheet-like material into strips, wind it onto each take-up roll, bring the plurality of take-up rolls into contact with a common touch roll, and measure the winding tension of each cut sheet-like material on each take-up roll. In a slitter controlled by controlling rotational drive torque, the touch roll is surface-driven by each take-up roll, with the touch roll being substantially a free roll;
The tension generated in the sheet immediately before the touch roll is detected, and the rotational drive torque of each take-up roll is controlled according to the detected tension to determine the winding tension of each sheet to be wound on each take-up roll. A method for controlling the winding tension of a sheet-like material, the method comprising controlling the winding tension of a sheet-like material. (2) The sheet-like material according to claim 1, wherein the tension of the sheet 1 to the sheet material immediately before the touch roll is detected by providing a guide roll immediately before the touch roll and detecting the torque applied to the guide roll. A method for controlling the winding tension of objects. (3) The tension of the sheet material immediately before the touch roll is detected by providing a guide roll immediately before the touch roll and detecting the difference in circumferential speed between the touch roll and the guide roll. A method for controlling the winding tension of a sheet material.