JPH10167534A - Rewinder driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To send out a web certainly even if it can not be pinched, for example because the web surface is damaged in rewinding, without slipping at the peripheral surface of the takeup roller. SOLUTION: An unwinder device A, receiving device B, and a takeup device C are arranged in series and are independently driven by motors M1, M2 and M3 installed on a rewinder device, wherein the motors M1 and M3 are of torque adjustable type while M2 is of variable speed type, and the actual speed of the web 2 is sensed and compared with the operating speed set by the receiving motor so that the actual speed of the web 2 is always identical to the receiving speed. If any difference exists between the receiving speed and the web speed, an appropriate correction is made, and the torque of the unwinder motor or takeup motor is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a rewinder for unwinding and rewinding a web roll, for example, a slitter.

[0002]

2. Description of the Related Art A conventional rewinder is schematically shown in FIG. 2 by three elements: an unwinding device A, a take-up device B, and a rewinding device (hereinafter simply referred to as a winding device) C. The winding device C has a roll R
In order to control the winding appearance and winding hardness of the roll R, the touch roller 1 is constantly pressed against the roll R with a predetermined contact pressure while being in contact therewith to wind the roll R.

[0003] The drive system of this rewinder device is as follows.
As can be seen in the drawing, the unwinding device A is the unwinding motor M ₁ , the unwinding device B is the unwinding motor M ₂ , and the unwinding device C
Are each separately driven by a winding motor M _3, unwound from the unwinding device A, securely pinch the take-up rollers 3 and 4 the web 2 which is wound by the winding device C is taking device B Then, the tension of the web 2 being transferred between the unwinding device A and the unwinding device B, that is, the unwinding tension T _1, is sent from the unwinding device B toward the winding device C in the direction of the arrow. is controlled by the unwind motor M _1, the tension i.e. unwinding tension T ₂ of the web 2 to be transferred between the take-up device B and the unwinding device C is controlled by the winding motor M _3, so that they do not affect each other The tension is cut reliably.

[0004] However, in the above-mentioned rewinder device, there is not much problem as long as the tension is surely cut. However, depending on the type of web, when the web 2 is pinched by the take-up device B, the web surface is rubbed. In some cases, the web cannot be pinched due to damage or the like.

Therefore, in order to securely grasp and send out the web without pinching, the take-up device is improved, and as shown in FIG. The two rollers 3 and 4 are Z-hung or S-hung as shown in FIG. 3 to increase the angle at which the web 2 surrounds the peripheral surface of the take-up rollers 3 and 4 (roller hug angle of the web), and further pulls. A device is used in which the cylindrical peripheral surfaces of the take-up rollers 3 and 4 are coated with a substance having a high coefficient of friction, or the diameter of the rollers is increased so that no slippage occurs between the roller peripheral surfaces and the web.

However, in the case of such an apparatus, when the running speed of the web increases, air is drawn between the peripheral surface of the roller and the web, a thin air layer is formed on the roller surface, and the web gripping force is significantly reduced. The web slips on the surface. This occurs especially on slippery webs, such as films coated on the surface with silicone. As a result, abrasion due to slippage occurs on the web surface,
It severely degrades the quality of the product and causes fatal defects that cause defective products.

On the other hand, as another countermeasure, a take-up roller is used as a suction roller, a large number of small-diameter suction holes are formed in the roller surface, and the end shaft of the roller is hollow, and the roller is connected to a suction pump to reduce the height of the roller surface. Attempts have been made to create an airflow that passes through the shaft through the roller cylinder, and suction-grip the web on the roller surface.However, the cost of manufacturing the roller is expensive, and traces of suction holes on the roller surface are formed on the web surface. There is a drawback that there is.

[0008]

SUMMARY OF THE INVENTION The present invention addresses the above-described problems and, in order to solve these defects, focuses on the torque control between the actual web winding speed and the take-up speed. An object of the present invention is to reliably send out a web that cannot be pinched due to, for example, damaging the web surface without slipping on the peripheral surface of the take-up roller.

[0009]

That is, one of the features of the present invention that meets the above-mentioned object is that the unwinding device, the take-up device and the winding device are arranged in series as a driving method of the rewinder device. In a rewinder device provided with an electric motor that is driven separately and independently, the unwinding device and the winding device are driven by a torque-adjustable electric motor,
The take-off device is driven by a variable speed motor, and the actual speed of the web is detected and compared with the operation speed set by the take-off motor,
The purpose is to control the torque of either the unwinding motor or the winding motor so that the actual web speed always matches the take-up speed.

According to a second aspect of the present invention, there is provided a specific mode of torque control of an unwinding motor including correction when a speed difference occurs between a take-up speed and an actual web speed in the above-mentioned driving method. In connection with the touch roll of the device. A web speed detection device is provided, a take-up speed detection device is provided in connection with the motor of the take-up device, and a proportional integrator for a difference between the take-up speed and the web speed is provided, and the take-up motor detected by the take-up motor control device is provided. The tension value is corrected through the proportional integrator, the corrected value is multiplied by the winding diameter value calculated by the unwinding roll diameter calculator, and torque control is performed based on the result.

[0011]

The actual running speed of the web and the peripheral speed of the take-off roller are positively matched even when the web is not pinched due to damage to the surface of the web when rewinding by the driving method of the present invention. If there is a difference, the web is securely gripped by the take-up roller by being corrected and driven, so that the surface of the take-up roller is surely prevented from slipping on the roller surface and without damaging the web surface. It is transported at a speed and does not cause product defects.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the driving method of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, the conventional driving method focuses only on the take-up device, and changes the idea that has always been taken to prevent slipping between the web to be fed and the take-up roller, and actively drives the actual running of the web. The speed and the peripheral speed of the take-off roller are made to coincide with each other, and FIG. 1 shows an outline of the drive system.

[0014]

That is, according to the present invention, the unwinding device A, the take-up device B, and the take-up device C are arranged in series as shown in the figure, and each motor individually drives them independently and independently. Driven by M ₁ , M ₂ , M ₃ , the web 2 unwound by the unwinder A is sent through the take-up rollers 3, 4 of the take-up device B, and the web 2 is constantly driven by the touch roller 1 at the take-up device C. It is the same as that of the related art that is wound while being brought into contact with the predetermined pressure, and there is no particular difference on the surface.

However, in the present invention, as one of its features, a pinch force is not applied so that the take-up rollers 3 and 4 of the take-up device B damage the web surface as in the prior art.

In the illustrated drive system of the present invention, the drive motors M ₁ and M ₃ of the unwinding device A and the winding device C among the unwinding device A, the take-up device B, and the winding device C are provided. each torque adjustable motor is used, the driving motor M ₂ intermediate take-up device B are respectively driven done used the variable speed electric motor.

[0017] Thus, in the driving system, the touch roller 1 has a web Hashihaya detector 5 is associated attached, while a driving motor M ₁ of the unwinding device A, for driving the take-up device B unwinding speed for the control of each the driving motor M ₃ of the motor M ₂ and the winding device C, take-up speed, along with the detection device 6, 7 and 8 each for detecting the winding speed is attached The take-up device B is provided with a proportional integrator 9 for the difference δ between the take-up speed and the web speed, in addition to the take-up speed detecting device 7.
The winding tension value 11 is detected from 0, and when the speed difference δ is generated, the value is corrected through the proportional integrator 9 to the winding tension value 11, and the unwinding roll diameter calculator is separately calculated from the numerical value 12. The multiplier 14 multiplies the winding diameter value calculated at 13 by the multiplier 14,
It is configured to perform the torque control of the drive motor M ₁ of the unwinding device A.

In the present invention, the actual running speed V _{1 of the} web and the peripheral speed V _{2 of}
Is important, that is, it is important to always drive such that the relationship of V ₁ = V ₂ is maintained. If this further detail, in FIG. 4, the take-up the web 2 to the rollers 3 and 4 to surround the running, roller center between the rollers 3,4 unwinding tension T ₁ of the web, the winding tension T ₂ , A contact pressure P is generated. Therefore, assuming that the friction coefficient between the roller surface and the web 2 is μ, the web gripping force F of the take-off roller is F = P · μ.

When the relationship of F ≧ T ₁ −T ₂ is established between the unwinding tension (take-up tension) T ₁ , the take-up tension T ₂ and the web gripping force F, the web 2 is taken up by the take-up roller 3, 4
Is transported at the surface speed of the take-up rollers 3 and 4 without slipping on the roller surface. If the relationship of F ≧ T ₁ −T ₂ does not hold, and if T ₁ −T ₂ > 0, the web 2 is pulled toward the unwinding side, and its running speed is determined by the take-up rollers 3, 4. Slower, causing slippage on the rollers.

On the other hand, if T ₁ −T ₂ <0, the web 2 is pulled toward the winding side, and its running speed becomes faster than the peripheral speed of the take-up rollers 3 and 4. Causes slippage. In any case, the problem does not become apparent as long as the speed difference is small. However, in actual use, in the case of a silicon-coated polystyrene film, when the running speed is 300 m / min, the speed difference exceeds 1%. It was confirmed that scratches appeared on the film. On the other hand, according to the driving method of the present invention, the problem did not occur and it was proved that the problem could be solved.

[0021]

As described above, the present invention compares the actual running speed of the web with the operating speed set by the take-off motor as a driving method of the rewinder device such as a slitter device, and determines that the web speed is equal to the take-up speed. It controls the torque of the unwinding or winding motor so that it matches, so even in a web rewinding device that cannot be pinched because the web surface is damaged or the like, there is no slippage at all. It is possible to send out and wind up the web, and as a slitter device for a film or the like coated with silicon on its surface, it has a remarkable effect of enabling smooth transfer without impairing the quality of the product at all. Further, when there is a difference between the web speed and the take-up speed, the take-up tension value is detected, corrected based on the speed difference, and further calculated as the unwind roll diameter to obtain the unwind motor. Is performed, the actual running speed of the web is matched with the take-up speed, and the above-described effect can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a drive system of a rewinder device according to the present invention.

FIG. 2 is a schematic diagram illustrating a driving method of a conventional rewinder device.

FIG. 3 is a partial explanatory view showing another mode of a conventional take-up roller.

FIG. 4 is an explanatory diagram showing a state in which a web is brought into contact with a take-up roller.

[Explanation of symbols]

A unwinding device B take-up device C winding device M ₁ unwinding device driving motor M ₂ take-up device driving motor M ₃ Winding device driving motor 1 touch roller 2 webs 3, 4 take-off roller 5 web running Speed detecting device 6, 7, 8 Speed detecting device with each motor 9 Proportional integrator 10 Winding motor control device 14 Multiplier

Claims (2)

[Claims] 1. A rewinding device in which an unwinding device, a take-up device, and a winding device are arranged in a series, and each of which is provided with an electric motor that is driven independently and independently, wherein the unwinding device and the winding device can be torqued. Driven by the adjustment motor and the take-up device by the variable-speed motor, detect and compare the actual speed of the web with the operation speed set by the take-off motor,
A driving method for a rewinding device, wherein the torque of either the unwinding motor or the winding motor is controlled so that the actual web speed always matches the take-up speed. 2. A web speed detection device is provided in connection with the touch roll of the unwinding device, and a take-up speed detection device is provided in connection with the motor of the take-up device, and a proportionality of a difference between the take-up speed and the web speed. An integrator is provided to correct the winding tension value detected by the winding motor control device through the proportional integrator, and the corrected value is multiplied by the winding diameter value calculated by the unwinding roll diameter calculator to unwind. The method for driving a rewinder device according to claim 1, wherein torque control of the electric motor is performed.