JPH08143196A - Method and device for controlling tension of two-shaft winder - Google Patents

Abstract

PURPOSE: To perform stable winding operation by a method wherein during cutting of a sheet film by a traverse type cutter, the output of an electric motor for a winding shaft on the winding completion side is gradually decreased, and output torque of an electric motor form a winding shaft on the winding starting side is gradually increased. CONSTITUTION: During cutting of a sheet film W by a traverse type cutter 13, output torque of an electric motor for a first winding shaft 5 on the winding completion side is gradually decreased from specified torque (control target torque), and output torque of an electric motor for a second winding shaft 7 on the winding starting side is gradually decreased from zero. This constitution keeps a total tension, exerted on the sheet film W, at a given value by specified torque during cutting, and prevents an excessive winding tension from being exerted on the sheet film W in both the first winding shaft 5 on the winding completion side and the second winding shaft 7 on the winding starting side and performs stable winding operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension control method and apparatus for a twin-screw winder, and more particularly to a tension control method for a twin-screw winder that continuously winds a sheet / film in a sheet / film production line. And the device.

[0002]

2. Description of the Related Art As a winding machine for continuously winding a sheet / film, two winding shafts each driven by an individual electric motor to wind the sheet / film individually,
And a traverse type cutter that cuts the sheet film by traveling in the width direction of the sheet film between the two winding shafts. Type cutter seat
Biaxial winders are known that cut the film and start winding the sheet film around the other wind shaft.

This twin-screw winder is of a center wind-up type in which the winding tension of the sheet / film is controlled to a predetermined value by controlling the output torque of an electric motor that rotationally drives the winding shaft.
In this twin-screw winder, during normal winding, the speed of the electric motor is controlled in synchronism with the feed speed of the sheet / film by a winding diameter calculation or the like, and the winding tension is controlled to be kept at a predetermined constant value. .

Further, in this twin-screw winder, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent No. 2566962, when a sheet or film is cut by a traverse cutter, driving of a take-up shaft on the take-up completion side is performed so that excessive tension does not act on the sheet / film being cut so that the film is not broken. It has been proposed to taper the torque.

In the conventional twin-screw winding machine as described above, when the sheet / film is cut, even if the drive torque of the winding shaft on the winding completion side is controlled to be gradually reduced, the winding is newly started. The drive torque of the shaft is controlled to keep the winding tension at a predetermined constant value, as in the normal winding.

[0006]

However, the tension acting on the sheet / film at the time of cutting the sheet / film depends on the driving torque of the winding shaft on the winding completion side and the driving torque of the winding shaft to start new winding. Based on the theory that it depends on the sum of the above, the winding tension of the sheet / film on the winding shaft that starts winding becomes unstable because the drive torque of the winding shaft on the winding completion side is excessive. Become. For this reason, the sheet / film is wrinkled on the winding shaft side where the winding is started,
Breakage, tears, etc. occur, and a stable winding start operation cannot be performed. Once wrinkles occur in the sheet film at the start of winding, the wrinkles are transferred to the sheet film that is subsequently wound, which causes a defective winding product of several 100 m.

The present invention has been made by paying attention to the above-mentioned problems, and at the time of cutting a sheet or film, the sheet is wound on either the winding shaft on the winding completion side or the winding shaft on the winding start side. An object of the present invention is to provide a tension control method and device for a twin-screw winder that avoids excessive winding tension of the film and enables stable winding operation.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide two winding shafts, which are respectively driven to rotate by individual electric motors, to individually wind a sheet film, and the two winding shafts. It has a traverse type cutter that cuts the sheet film by traveling in the width direction of the sheet film between the shafts, and if a predetermined amount of the sheet film is wound around one winding shaft, the sheet In the tension control method of the twin-screw winder that cuts the film and starts winding the sheet / film on the other winding shaft, when cutting the sheet / film by the traverse cutter, one of the winding shafts This is achieved by a tension control method for a twin-screw winder, characterized in that the output torque of the electric motor is gradually reduced and the output torque of the electric motor of the other winding shaft is gradually increased.

Further, in the tension control method for a twin-screw winder according to the present invention, the sum of the output torque of the electric motor of the one winding shaft and the electric output torque of the other winding shaft during the cutting of the sheet / film. The output torque of the electric motor of the one winding shaft is gradually reduced, and the output torque of the electric motor of the other winding shaft is gradually increased so as to keep the constant value of.

In order to achieve the above-mentioned object, the tension control device for a twin-screw winder according to the present invention has two winding shafts that are individually driven to rotate by individual electric motors to wind a sheet film. And a traverse cutter that cuts the sheet film by traveling in the width direction of the sheet film between the two winding shafts, and if a predetermined amount of the sheet film is wound on one winding shaft, Cutting the sheet film by the traverse type cutter, in the tension control device of the twin-screw winder that starts the winding of the sheet film on the other winding shaft, at the time of cutting the sheet film by the traverse type cutter, It is characterized in that it has a control device for gradually decreasing the output torque of the electric motor of the one winding shaft and gradually increasing the output torque of the electric motor of the other winding shaft. .

Further, in the tension control device for the twin-screw winder according to the present invention, the control device is such that the output torque of the electric motor of the one take-up shaft and the electric motor of the other take-up shaft during cutting of the sheet / film. In order to maintain a constant value with the output torque of, the output torque of the electric motor of the one winding shaft is gradually reduced,
The detailed feature is that the output torque of the electric motor of the other winding shaft is gradually increased.

[0012]

With the above-described structure, when the sheet or film is cut by the traverse type cutter, the output torque of the motor of the winding shaft on the winding completion side is gradually reduced, and the motor of the winding shaft for starting winding is By gradually increasing the output torque, the winding tension of the sheet / film does not become excessive on either the winding shaft on the winding completion side or the winding shaft on the winding start side.

Here, the output torque of the electric motor of the winding shaft on the winding completion side is gradually reduced to zero from the specified torque value during steady winding, and the output torque of the electric motor of the winding shaft on the winding start side is gradually increased. The value increases from zero or a value close to zero to the specified torque value during steady winding.

During the cutting of the sheet / film, the winding completion side winding is controlled by gradually reducing the output torque of the winding completion side electric motor and gradually increasing the output torque of the winding start side winding motor. If the sum of the output torque of the motor of the shaft and the output torque of the motor of the winding start side winding motor is kept constant, the tension applied to the sheet film during cutting the sheet film is kept constant. It is possible to more surely prevent the winding tension of the sheet / film from becoming excessive in both the winding shaft on the winding completion side and the winding shaft on the winding start side.

[0015]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a twin-screw winder to which the tension control device according to the present invention is applied. The twin-screw winder has an arm 3 which is rotated about a pivot 1 by 180 degrees by a drive device (not shown).
A first winding shaft 5 is rotatably attached to one end of the arm 3, and a second winding shaft 7 is rotatably attached to the other end.

The first winding shaft 5 and the second winding shaft 7 are rotationally driven by individual electric motors 9 and 11 (see FIG. 2),
The sheet / film W is pressed by the pressing roller 12 to wind the sheet / film W individually in a predetermined tension applied state.

The biaxial winding machine is a traverse type machine which cuts the sheet film W by traveling in the width direction of the sheet film W between the first winding shaft 5 and the second winding shaft 7. It has a cutter 13. In the traverse type cutter 13, one winding shaft, in FIG. 1, the first winding shaft 5 is a sheet / film W.
When the sheet is wound by a predetermined amount, the sheet / film W is cut.

FIG. 2 shows an embodiment of a tension control device for a twin-screw winder according to the present invention.

The tension control device has a tension setting section 15 for setting a control target value of tension, and the tension setting section 15 winds a control target torque Tset determined by the control target tension value together with a winding completion side torque setting section 17. It is output to the take start side torque setting unit 19.

The winding completion side torque setting section 17 and the winding start side torque setting section 19 are given a trigger signal at the start of cutting the sheet / film W by the traverse cutter 13.
The winding completion side torque setting unit 17 sets the winding completion side control target torque Te according to the formula (1), and the winding start side torque setting unit 19 sets the winding start side control target torque Ts according to the formula (2). To do.

Te = Tset {1- (t / tc)} (1) Ts = Tset (t / tc) (2) where t is the elapsed time from the trigger signal input time, and the trigger signal input time is zero. Is. tc is a required cutting time, and the required cutting time tc is calculated from the width dimension w of the sheet / film W and the traveling speed Vc of the traverse type cutter 13 which are input in advance according to the equation (3).

Tc = w / Vc (3) The winding completion side control target torque Te and the winding start side control target torque Ts are given to the individual winding diameter correction units 21 and 23 to be wound diameter corrected, and Compensation calculation is performed by feedback compensation units 25 and 27 such as mechanical loss compensation, inertia compensation, and tension compensation, and the results are given to drive circuits 29 and 31 of the electric motors 9 and 11.

For example, if the first winding shaft 5 is currently on the winding completion side and the second winding shaft 7 is on the winding start side, the winding completion side after the winding diameter correction and various compensation calculations is performed. Control target torque Te
Is input to the drive circuit 29, the torque control of the electric motor 9 of the first winding shaft 5 is quantitatively performed according to the winding completion side control target torque Te, and the winding diameter is corrected and the winding after the various compensation calculations is performed. The take-up start side control target torque Ts is input to the drive circuit 31, and the torque control of the electric motor 11 of the second take-up shaft 7 is quantitatively performed according to the take-up start side control target torque Ts.

As a result, as shown in FIG.
When the sheet / film W is cut by the traverse cutter 13, the output torque of the electric motor 9 of the first winding shaft 5, which is the winding completion side, has a characteristic of Tset · {1- (t / tc)} and the specified torque ( The output torque of the electric motor 11 of the second winding shaft 7 on the winding start side is smaller than the control target torque Tset), and the output torque of the electric motor of the other winding shaft is Tset · (t / tc). Gradually increase with the characteristics of.
Since t = 0 at the start of cutting, the output torque of the electric motor 9 of the first winding shaft 5 at the start of cutting is Tset, and the output torque of the electric motor 11 of the second winding shaft 7 is zero. Since t = tc at the time of completion, the output torque of the electric motor 9 of the first winding shaft 5 at the time of completion of cutting is zero, and the electric motor 1 of the second winding shaft 7 is
The output torque of 1 is Tset, and the sum of the output torque of the electric motor 9 and the output torque of the electric motor 11 during cutting is always maintained at the specified torque Tset.

As a result, the total tension acting on the sheet / film W during cutting is maintained at a predetermined value by the specified torque Tset, and the first winding shaft 5 on the winding completion side and the second winding on the winding start side. The winding tension is not excessively applied to the sheet / film W on any of the take-up shafts 7.

As a result, the sheet
Both the breakage of the film W and the occurrence of wrinkles, folds, tears and the like on the sheet / film W on the winding start side are avoided, and the occurrence of defective products is avoided.

After the completion of cutting, t = tc may be maintained.

FIG. 2 shows the case where the first winding shaft 5 is on the winding completion side and the second winding shaft 7 is on the winding start side. On the starting side, when the second winding shaft 7 is the winding completion starting side, the winding completion side torque setting unit 17
Is connected to the drive circuit 31 of the electric motor 9 of the second winding shaft 7, and the series of the winding start side torque setting unit 19 is connected to the drive circuit 29 of the electric motor 11 of the first winding shaft 5. To be done.

In the embodiment described above, the gradual reduction control of the output torque of the electric motor on the winding completion side and the gradual increase control of the output torque of the electric motor on the winding start side are performed by the timer control. This control is performed by the traverse type cutter 13. The cutter position information may be input to perform feedback compensation based on the cutter position, and its specific control method is not limited to the timer control as described above.

[0031]

As can be understood from the above description, according to the tension control method and apparatus for a twin-screw winder of the present invention,
When a sheet or film is cut by the traverse cutter, the output torque of the motor of the winding shaft on the winding completion side gradually decreases, and the output torque of the motor of the winding shaft that starts winding gradually increases. Since the take-up tension of the sheet / film does not become excessive on either the take-up shaft on the take-up side or the take-up shaft on the take-up start side, the sheet / film breaks on the take-up completion side. Wrinkles, folds, tears and the like on the sheet and film on the starting side are all avoided. This prevents the occurrence of defective products,
The winding of the sheet / film in the sheet / film production line can be performed continuously and efficiently and satisfactorily.

During the cutting of the sheet / film, the winding completion side winding is controlled by the gradual reduction control of the output torque of the winding completion side electric motor and the gradual increase control of the output torque of the winding start side winding motor. If the sum of the output torque of the motor on the shaft and the output torque of the motor on the winding start side is kept at a constant value, the tension acting on the sheet film during the cutting of the sheet film will be kept at a constant value. It is possible to more reliably prevent excessive winding tension of the sheet / film on both the winding shaft on the winding completion side and the winding shaft on the winding start side. It is possible to more reliably avoid the breakage of the sheet and the occurrence of wrinkles, folds, and tears in the sheet / film on the winding start side.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a twin-screw winder to which a tension control device according to the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a tension control device for a twin-screw winder according to the present invention.

FIG. 3 is a graph showing change characteristics of the output torque of the electric motor of the winding shaft on the winding completion side and the output torque of the electric motor of the winding shaft on the winding start side at the time of cutting the sheet / film.

[Explanation of symbols]

 5 First winding shaft 7 Second winding shaft 9 Electric motor 11 Electric motor 12 Pressure contact roller 13 Traverse type cutter 15 Tension setting unit 17 Winding completion side torque setting unit 19 Winding start side torque setting unit

Claims (4)

[Claims] 1. A pair of winding shafts, each of which is driven to rotate by an individual electric motor to wind the sheet film individually, and a sheet which runs in the width direction of the sheet film between the two winding shafts. It has a traverse type cutter for cutting the film, and if a predetermined amount of the sheet film is wound on one winding shaft, the sheet film is cut by the traverse type cutter, and the sheet for the other winding shaft is cut.
In a tension control method for a twin-screw winder that starts winding a film, when the sheet or film is cut by the traverse cutter, the output torque of the electric motor of the one winding shaft is gradually reduced and the other winding winds. A tension control method for a twin-screw winder, which comprises gradually increasing the output torque of an electric motor for a shaft. 2. One of the take-up shafts so that the sum of the output torque of the electric motors of the one take-up shaft and the output torque of the electric motors of the other take-up shaft is kept at a constant value during the cutting of the sheet / film. 2. The tension control method for a twin-screw winder according to claim 1, wherein the output torque of the electric motor is gradually decreased and the output torque of the electric motor of the other winding shaft is gradually increased. 3. Two take-up shafts, each of which is driven to rotate by an individual electric motor to wind the sheet / film individually.
And a traverse type cutter that cuts the sheet film by traveling in the width direction of the sheet film between the two winding shafts. Type cutter seat
In the tension control device of the twin-screw winder that cuts the film and starts winding the sheet / film on the other winding shaft, when cutting the sheet / film by the traverse cutter, one of the winding shafts A tension control device for a twin-screw winder, comprising a control device for gradually reducing the output torque of the electric motor and gradually increasing the electric output torque of the other winding shaft. 4. The control device keeps the sum of the output torque of the electric motor of the one winding shaft and the output torque of the electric motor of the other winding shaft at a constant value during the cutting of the sheet / film. Gradually reduce the output torque of the motor of one winding shaft,
The tension control device for a twin-screw winder according to claim 3, wherein the output torque of the electric motor of the other wind-up shaft is gradually increased.