JPH0885659A - Web work machine - Google Patents

Abstract

PURPOSE: To make highly accurate and subtle tension control achievable by controlling a web speed and torque corresponding to the extent of tension with a first AC servomotor for a raw fabric roll, a second AC servomotor for a delivery roll and a third AC servomotor for a product roll. CONSTITUTION: Each of current values with a second AC servomotor 31 driving a delivery roll 30, a third AC servomotor 71 driving the winding side, and two fourth AC servomotors 81A and 81B is read, thereby finding each output. A first AC servomotor 13 at the unreeled side is controlled over its torque so as to be turned to the current value corresponding to the required tension T1. The third AC servomotor 71 controls its own torque so as to keep the current value corresponding to some tension T2 being intended for a web lying between the delivery roll 30 and two surface rolls 70A, 70B. Accordingly, such control as starting from almost zero tension and highly accurate winding both can be performed without requiring any special tension detecting mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web processing machine such as a slitting machine for slitting a so-called web, which is a sheet-like object such as paper or plastic film, to a predetermined width.

[0002]

2. Description of the Related Art Conventionally, in a web processing machine of this type, after processing such as slitting while rewinding the web from a raw roll wound with a wide web, the processed web is rewound. It is performed such that it is wound up into a product roll (winding roll). In such a conventional web processing machine, a mechanical brake or a powder brake is exclusively used on the unreel side for rewinding the original roll, and a tension detection roll is arranged between the unreel and the payout roll to detect the tension between them. Then
Tension control is performed. In some cases, the unreel-side winding diameter is obtained by calculation, and control without a tension detecting roll is performed.

On the other hand, the tension between the payout roll and the product roll (winding roll) is controlled by placing a powder clutch on the drive side of the winding roll and giving an empirical slip ratio, or during that time. A dancer roll is arranged, the weight of this dancer roll is specified,
A method of slipping the powder clutch so that the position is fixed has been taken. Of course, control using a motor instead of the powder clutch has also been performed.

[0004]

In such a conventional web processing machine, the web tension control method is as follows.
In particular, in the method of using a mechanical brake or powder brake on the unreel side in processing ultra-thin films, etc., mechanical loss is large and excessive tension occurs,
There were inconveniences such as permanent distortion of the film.

On the other hand, on the winding side, in addition to the above-mentioned problems, there are problems such as the winding hardness and the winding appearance which are directly related to the quality of the product, and these are also determined by the tension. The AC servo motor on the winding side is
It must be possible to temporarily cut the unreel side tension by the delivery roll and rewind the released sheet by subtle tension control.

Further, disposing the tension detecting roll, the dancer roll, or the like complicates the apparatus, and in some cases it may be difficult to install.

An object of the present invention is to provide a web processing machine which solves the problems of the prior art as described above, simplifies the configuration of the apparatus, and enables fine and precise tension control from zero tension. is there.

[0008]

According to one aspect of the present invention, a web processing machine includes an unreel stand for holding an unrolled roll of a web around which a web to be processed is rewound, and a web. A processing means for processing, and a web is unwound toward the processing means from the original roll held between the unreel stand and the processing means and held by the unreel stand. In a web processing machine equipped with a feeding roll for winding and a winding means for winding the web processed by the processing means into a product roll, the web processing machine is provided on the unreel stand and rotated to the original roll. A first AC servo motor for giving a torque, a second AC servo motor for giving a rotating torque to the pay-out roll, and the winding means. Therefore, a third AC servomotor for driving a surface roll for imparting a rotational torque to the product roll formed is provided, and the second AC servomotor speeds so as to obtain a desired web speed. It is controlled and reads the current value of the second AC servo motor and the third AC servo motor, and the current value corresponding to the summed output is to be applied to the web between the unreel stand and the payout roll. The first AC servomotor is torque-controlled so that the current value corresponds to a desired tension, and the third AC servomotor is controlled.
The servomotor is characterized in that the servomotor itself controls the torque so as to maintain a current value corresponding to a desired tension to be applied to the web between the processing means and the winding means.

According to another feature of the present invention, a web processing machine includes an unreel stand for holding a web roll around which a web to be processed is wound so as to be able to be rewound, and a processing machine for processing the web. Means, an unwinding roll arranged between the unreel stand and the processing means, and an unwinding roll for unwinding a web from the raw roll held by the unreel stand toward the unwinding means, A web processing machine provided with winding means for winding the web processed by the processing means into a product roll, the web processing machine being provided on the unreel stand for applying a rotating torque to the raw roll. 1 AC
A servo motor, a second AC servomotor for applying a rotational torque to the payout roll, and a third AC for driving a surface roll for applying a rotational torque to the product roll formed by the winding means.
A servo motor, the second AC servo motor is speed controlled to a desired web speed,
The current values of the second AC servomotor and the third AC servomotor are read, and the current value corresponding to the total output is a desired tension to be applied to the web between the unreel stand and the payout roll. The first AC servomotor is torque-controlled so as to have a current value corresponding to the second AC servomotor, and a desired tension to be applied to a web between the processing means and the winding means is applied to the second AC servomotor. The motor is controlled by draw control so that the rotation ratio between the motor and the third AC servomotor is constant.

According to still another feature of the present invention, the winding means includes a product roll forming section for winding and forming the product roll, wherein the product roll forming section rotates on the product roll. A fourth AC servo motor for applying torque is provided, and the current value of the fourth AC servo motor is read, and the summed output is obtained by adding the current value of the fourth AC servo motor. To do.

[0011]

The AC servo motor used in the present invention is
The generated torque is proportional to the current value, and its rotation speed is determined only by the voltage. Since there is no correlation between the torque and the number of rotations, this characteristic is used to control the speed of the second AC servomotor that drives the feeding roll, and to control the speed at a predetermined number of rotations. Rotate accurately. That is, the machine speed (web speed) is determined. Of course, a DC servo motor or the like having the above characteristics may be used. Therefore,
The term "AC servomotor" used in this specification
Has a broad meaning including such a DC servo motor and the like.

In the case where the sum of the outputs of the second AC servomotor for driving the feeding roll and the output of the third AC servomotor or the case where the fourth AC servomotor is provided, Further, the sum of the output of the fourth AC servomotor and the total is the desired tension between the unreel stand and the pay-out roll. Therefore, the first AC reel on the unreel side is set to have a current value corresponding thereto. What is necessary is just to operate a servomotor. Generally, it operates as a brake. However, depending on the case, for example, when the mechanical loss is extremely disliked, or when the winding diameter is started with a large diameter, the rotation may be assisted as a motor.

Further, the current value of the second AC servomotor for driving the feeding roll does not correspond to the tension T ₁ between the unreel stand and the feeding roll in a ratio of 1: 1. Because, as described above,
This is because being affected by the tension T ₂ of the between product roll (take-up roll). That is, the torque T _{Q2 of the} feeding roll is given by the following equation.

T _Q2 = (T ₁ −T ₂ ) · d / 2 where d is the diameter of the payout roll.

That is, the pay-out roll is placed at the center,
Unreel side tension T ₁ and winding side tension T ₂
And the second AC driving the feeding roll
The torque T _{Q2 of the} servo motor is determined. However, since both T ₁ and T ₂ are set values, the difference between them is T ₀ : T ₀ = (T ₁ −T ₂ ) Therefore, T _Q2 = T ₀ · d / 2 As if the torque with respect to the tension of T ₀ And this is immediately sought.

On the other hand, the third AC servomotor on the product roll (winding roll) side controls the torque so that its own current value becomes a current value corresponding to the desired tension T ₂ , or The tension T _{2 is} controlled by the draw control so that the rotation ratio with the AC servomotor 2 is kept constant.
May be controlled. The power supply of each AC servomotor is usually the same power supply, and the first AC
Since the servomotor normally operates as a brake, the generated energy generated by the servomotor is returned to the system, which is a significant energy saving.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 schematically shows the entire configuration of a slitting machine which is a web processing machine as one embodiment of the present invention. The slitting machine mainly includes an unreel stand 10 for holding a web roll 1 on which a web to be processed is wound so that the web 1 can be rewound, and a web slitting means for processing the web. For feeding the web 2 from the raw roll 1 disposed between the unreel stand 10 and the slitter 50 and held on the unreel stand 10 toward the slitter 50. A roll 30; surface rolls 70A and 70B constituting winding means for winding the webs 3A and 3B slitted by the slitter 50 into product rolls 4A and 4B; and product roll forming sections 90A and 90B. ing.

The unreel stand 10 is provided with a support arm 11 attached to the machine frame 5. The original roll 1 can be inserted into the tip of the support arm 11 and rotated together with the original roll. The shaft 12 is attached. Further, the support arm 11 is provided with a first AC servomotor 13 for rotating the shaft 12 to give a rotational torque to the original roll 1.

The machine frame 5 has a feeding roll 3
A second AC servomotor 31 for applying a rotational torque to zero is provided. In addition, a touch roll 32 is provided for the feeding roll 30. Further, a third AC servomotor 71 for applying a rotational torque to the surface rolls 70A and 70B is provided. In this embodiment, the upper and lower two surface rolls 70A and 70B are connected by a timing belt 72, and are configured to be integrally rotated by one AC servomotor 71.

The product roll 90A is supported by a linear rail (not shown) so as to freely reciprocate horizontally.
It comprises a winding shaft 80A around which the product roll 4A can be wound and rotated with it. The rack 91A, the pinion 92A, and the low-friction cylinder 93A are arranged on each of the pair of machine frames 5 on the operation side and the non-operation side, and the pinion 92A is connected to the operation side and the non-operation side by the same shaft. This is because the pinions 92A arranged on the operation side and the counter operation side are integrally rotated. Therefore, when the rack 91A is reciprocated by the low friction cylinder 93A coupled to the rack 91A, the movement of the rack 91A is restricted through the pinion 92A on both the operating side and the non-operating side, and the rack 91A always reciprocates integrally and is connected thereto. The contact pressure of the winding shaft 80A with respect to the surface roll 70A is designed so that there is no difference between the operating side and the non-operating side. The contact pressure F to the surface roll 70A is controlled by adjusting the pressure of the cylinder 93A. Furthermore, a fourth AC servomotor 81A for applying rotation to the product roll 4A is associated with the winding shaft 80A that rotates with the product roll 4A.

Similarly, the product roll 90B is supported by a linear rail (not shown) for horizontal reciprocating movement, and is provided with a winding shaft 80B around which the product roll 4B can be wound and rotated. Rack 91
B, the pinion 92B and the low friction cylinder 93B
The pinion 92B is arranged on each of the pair of machine frames 5 on the operation side and the non-operation side, and the pinion 92B is connected to the operation side and the non-operation side by the same shaft. This is because the pinions 92 arranged on the operation side and the non-operation side are respectively provided.
This is because the rotation of B is integrally rotated. Therefore, when the rack 91B is reciprocated by the low-friction cylinder 93B coupled to the rack 91B, the movement of the rack 91B is restricted by the pinion 92B on both the operating side and the non-operating side, and the rack 91B always reciprocates integrally and is connected to the rack 91B. Winding shaft 80
The contact pressure of B on the surface roll 70B is
Care has been taken to avoid any difference between the non-operating sides. The control of the contact pressure F to the surface roll 70B is
This is performed by adjusting the pressure of the cylinder 93B. Furthermore, the winding shaft 80B that rotates together with the product roll 4B
Is associated with a fourth AC servomotor 81B for giving rotation to the product roll 4B.

Here, the AC servo motor used in the present invention may be any commercially available one. For example, the Minas series (MINA) from Matsushita Electric Industrial Co., Ltd.
S series) or a digital AC servo motor sold as Toyo Denki Co., Ltd. as BS Servo E series and F series.

Next, the overall operation and tension control of such a slitting machine will be described. A web 2 to be processed is fed from a raw roll 1 mounted on a shaft 12 of an unreel stand 10 to a feed roll 30.
Then, it is drawn out through the conversion rolls 21 and 22, and is sent to the slitter 50 through the nip portion between the feeding roll 30 and the touch roll 32, and further through the conversion rolls 41 and 42.

The webs 3A and 3B slit by the slitter 50 to a predetermined width are converted into rolls 61 and 62A, 63A and 62, respectively.
B, 63B, surface rolls 70A and 7
OB. These processed webs 3A and 3B are further processed into product roll forming parts 90A and 90B.
The winding shafts 80A and 80B are respectively wound around.

At this time, the product rolls 4A and 4B are
To the extent that a slip does not occur between the surfaces roll 70A and 70B by the tension T ₂ at the contact pressure F,
It is pressed against the surface rolls 70A and 70B. Since the cores of the product rolls (winding rolls) 4A and 4B and the surface rolls 70A and 70B are on the same horizontal line, they are hardly affected by the change in weight due to the increase in the winding diameter, and the diameter of the surface roll is ,
Since it is always constant, there is almost no need to consider the torque fluctuation of the third AC servomotor 71 due to the change of the winding diameter.

However, when the winding diameter of the product roll is large and the speed is high, the fluctuation of the acceleration / deceleration torque during acceleration / deceleration cannot be ignored, and it is necessary to correct it.
It is almost unnecessary with a normal slitting machine. Therefore, the current value of the third AC servo motor 71 for driving the surface rolls 70A and 70B, in the normal always tension T ₂ and 1: 1 relationship, by controlling the current value (torque control) control of T ₂ are possible.

On the other hand, the control of the tension T ₁ is almost always performed by using the first AC servomotor 13 on the unreel side as a brake. However, the raw material roll 1 has a smaller diameter than the product rolls 4A and 4B. Is extremely large, the weight is heavy, and the mechanical loss becomes extremely large. Therefore, it is impossible to control the tension T ₁ only by the current value of the first AC servomotor 13 on the unreel side in the same manner as the product roll side. It is.

Also, the response to the ever-changing diameter becomes complicated. Therefore, in general, a method has been adopted in which a tension detecting roll is placed between the unreel stand and the payout roll, and the tension of the web is directly measured to adjust the unreel side brake. In particular, since a mechanical brake or a powder brake is generally used for this brake, even if the brake is released, there is a problem that excessive tension occurs due to the mechanical loss. Moreover, the response to acceleration / deceleration torque is slow,
It was not suitable for increasing the diameter and speed of the raw roll.

As a very recent tendency, a motor brake system using a DC motor or the like instead of a mechanical brake or a powder brake has begun to be adopted. However, these are simply because the mechanical brake was replaced with the motor brake. However, the method of detecting and controlling the web tension by the tension detecting roll remains unchanged.

On the other hand, according to the present invention, the second AC servomotor 31 for driving the feeding roll 30, the third AC servomotor 71 for driving the winding side, and the fourth AC servomotor. When the motors 81A and 81B are provided, the current value with the fourth AC servo motor is read to obtain an output, and the first AC servo motor on the unreel side is adjusted so that the current value corresponds to the required tension T _1. 1
3 and a third AC servomotor 71
Is a feeding roll 30 and a surface roll 70A,
The desired tension T ₂ to be applied to the web between 70B and 70B
Controls the torque itself so as to keep the current value corresponding to whether or feed roll 30 and the surface roll 70A, the desired tension T ₂ to be subjected to the web between the 70B, the second AC servo motor 31 And the third AC servomotor 71 are controlled by draw control so that the rotation ratio is constant, so that a tension detection roll is not required, and the reaction is reduced as compared with the control in which feedback is performed using the tension detection roll. Is extremely quick. In addition, when the mechanical loss becomes excessive, for example, at the beginning of application of the material roll 1, the rotation can be automatically assisted as a drive motor.

The overall operation of such tension control will be collectively described below. First, payout roll 3
The second AC servomotor 31 for driving 0 is always speed-controlled so as to rotate at a predetermined speed.
The third AC servo motor 71 for driving the surface rolls 70A and 70B for driving the product roll 4A and 4B, and the torque control itself so as to keep the current value corresponding to the tension T _2, to control the tension T ₂ or one in which the rotation ratio between the second AC servo motor 31 and the third AC servo motor 71 to control the take-up roll side tension T ₂ by a draw control such that the constant.

First for driving the unrolled original roll 1
The AC servo motor 13 normally operates as a brake, and drives the second AC servo motor 31 and the third AC servo motor 71 that drive the feeding roll 30;
C servomotor 81A, when there is 81B, like the current value corresponding to the output of the sum of the fourth AC servo motor is a current value corresponding to the tension T _1, to control the braking force.

In this example, product rolls 4A and 4
B is center-driven by the fourth AC servomotors 81A and 81B that compensates for mechanical loss.
Of course, the driving force of the product rolls 4A and 4B described above is
To be precise, the driving force of the fourth AC servomotors 81A and 81B is added.

If it is desired to make the roll hardness of the product rolls 4A and 4B particularly soft, the tension and the contact pressure F should be made as small as possible so that the center drive by the fourth AC servomotor should be effective. Conversely, when low tension and a certain degree of hardness are required, it can be adjusted by increasing the contact pressure between the surface roll and the winding roll. By adjusting the contact pressure with the center drive as described above, the rigidity can be freely controlled.

[0036]

EFFECTS OF THE INVENTION In a web processing machine such as a slitting machine, a special tension detecting mechanism such as a tension detecting roll is not required, and it is possible to control from almost zero tension, and the winding roll has a certain degree of hardness. Highly accurate winding that can be freely adjusted is possible.

Therefore, the configuration of the entire web processing machine can be simplified and the web processing machine can be made inexpensive.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the overall configuration of a slitting machine which is a web processing machine as one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material roll 2 Web 3A Processed web 3B Processed web 4A Product roll 4B Product roll 5 Machine frame 10 Unreel stand 11 Support arm 12 Shaft 13 First AC servomotor 30 Feeding roll 31 Second AC servo Motor 32 Touch roll 50 Slitter 70A Surface roll 70B Surface roll 71 Third AC servomotor 72 Timing belt 80A Winding shaft 80B Winding shaft 81A Fourth AC servomotor 81B Fourth AC servomotor 90A Product roll forming part 90B Product roll forming section 91A rack 91B rack 92A pinion 92B pinion 93A low friction cylinder 93B low friction cylinder

Claims (4)

[Claims] 1. An unreel stand for holding a web roll around which a web to be processed is wound so as to be able to be unwound, a processing means for processing a web, and the unreel stand and the processing means. A delivery roll for delivering the web toward the processing means from the original roll held between the unrolled stands and a web processed by the processing means. In a web processing machine provided with a winding means for forming a roll, a first AC servomotor provided on the unreel stand for applying a rotation torque to the material roll, and a rotation torque for the delivery roll. And a second AC servomotor for applying a rotational torque to the product roll formed by the winding means. A third AC servo motor for driving a face roll, and the second A
The C servomotor is speed-controlled so as to attain a desired web speed, and the second AC servomotor and the third A servomotor are controlled.
The current value of the C servo motor is read, and the current value corresponding to the summed output is set to the current value corresponding to the desired tension to be applied to the web between the unreel stand and the payout roll. The first AC servo motor is torque-controlled, and the third AC servo motor is self-maintaining so as to maintain a current value corresponding to a desired tension to be applied to the web between the processing means and the winding means. A web processing machine characterized by controlling its own torque. 2. The winding means includes a product roll forming section for winding and forming the product roll, and the product roll forming section provides a fourth AC servomotor for applying a rotation torque to the product roll. Is provided, and the fourth A
2. The web processing machine according to claim 1, wherein the current value of the C servomotor is read, and the total output is obtained by adding the current value of the fourth AC servomotor. 3. An unreel stand for holding a web roll around which a web to be processed is wound so as to be able to be unwound, a processing means for processing the web, and the unreel stand and the processing means. A delivery roll for delivering the web toward the processing means from the original roll held between the unrolled stands and a web processed by the processing means. In a web processing machine provided with a winding means for forming a roll, a first AC servomotor provided on the unreel stand for applying a rotation torque to the material roll, and a rotation torque for the delivery roll. And a second AC servomotor for applying a rotational torque to the product roll formed by the winding means. A third AC servo motor for driving a face roll, and the second A
The C servomotor is speed-controlled so as to attain a desired web speed, and the second AC servomotor and the third A servomotor are controlled.
The current value of the C servo motor is read, and the current value corresponding to the total output is set to a current value corresponding to a desired tension to be applied to a web between the unreel stand and the feeding roll. Torque control of the first AC servomotor, and a desired tension to be applied to the web between the processing means and the winding means,
A web processing machine, which is controlled by a draw control so that a rotation ratio between the second AC servo motor and the third AC servo motor becomes constant. 4. The product winding unit includes a product roll forming unit that winds and forms the product roll. The product roll forming unit includes a fourth AC servomotor that applies a rotational torque to the product roll. Is provided, and the fourth A
The web processing machine according to claim 3, wherein the current value of the C servo motor is read, and the summed output is also the current value of the fourth AC servo motor.