JPH10310299A - Device and method for controlling tension of strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method whereby tension can be controlled stably when a strip is wound. SOLUTION: This strip tension control device is provided with a spring 9 which constantly applies to a dancer 10 a constant force whereby tension is provided to a strip 1; an encoder ED detecting the deviation angle of the dancer 10; a tension control unit 12 which receives the inputs of a signal TR serving as a reference and an output signal T1 from the encoder ED and outputs a signal TC that is based on the deviation between both signals; a buffer unit 13 forming a loop 19 of the strip 1 between a supply shaft 2 and the dancer 10; and a position control device 14 which restrains the deviation of the dancer 10 by controlling, according to the output signal TC from the tension control unit 12, the amount of the loop 19 which the buffer unit 13 forms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for controlling the tension of a belt suitable for winding while applying tension when winding an electrode material or the like in a manufacturing process of a lithium ion secondary battery, for example. It is.

[0002]

2. Description of the Related Art In a manufacturing process of a lithium ion secondary battery, for example, a band A, a separator A, a band B, and a separator B wound on another reel are unreeled from each reel. Are sequentially laminated on the same winding shaft, and two types of strips A and B
And two separators A and B, so that a total of four members are wound simultaneously. In an apparatus using such a winding method, there is a possibility that a winding shift or a tightening may occur when winding at a high speed. Therefore, in this type of apparatus, the strips A and B and the separators A and B (hereinafter, these strips A and B and the separators A and B
Are collectively referred to simply as a “band-like body”), and a control device for adjusting the tension for keeping the tension constant is incorporated in a conveyance path for guiding the belt. This is described in, for example,
-285717. JP-A-7-2
In the method disclosed in Japanese Patent No. 85717, when adjusting the tension, one end of the dancer is attached to a servomotor, and the other end is brought into contact with a belt-like body. It adjusts while varying the amount of body loop.

[0003]

However, in the method disclosed in Japanese Patent Application Laid-Open No. Hei 7-285717, the dancer is actively shaken (rotated) when adjusting the tension.
Although it is necessary, in this method, the swing of the dancer may change the tension at the time of adjustment due to its inertia and acceleration, so that there is a problem that stable control cannot be performed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus and a method for controlling the tension of a strip which can stably control the tension when the strip is wound. It is in. Further, other objects will be clarified sequentially in the contents described below.

[0005]

Means for Solving the Problems The present invention is characterized by taking the following technical means in order to achieve the above object.
That is, a tension control device that applies tension to the belt-shaped body by bringing the other end side of a dancer that rotates around one end into contact with the belt-shaped body that is fed out from the supply shaft and wound on the winding shaft. A tension applying means for constantly applying a constant force for applying tension to the belt-like body to the dancer, a rotation angle detecting means for detecting a swing angle of the dancer, a reference signal and the rotation A tension control unit that receives an output signal from the angle detection unit and outputs a signal based on a deviation between the two signals, and a loop that is provided between the supply shaft and the dancer and forms a loop in the band-shaped body Forming means, and a position control means for controlling the amount of loop formed by the loop forming means in accordance with an output signal from the tension control means to suppress the swing of the dancer. It was formed. Further, the present invention provides a belt-shaped body which is fed from a supply shaft and wound on a winding shaft,
In a tension control method for applying tension to the band by contacting the other end of the dancer rotating about one end as a fulcrum, a constant force for applying tension to the band is always applied to the dancer. A loop is formed on the front side of the dancer, and the amount of the loop is increased or decreased according to the swing angle of the dancer, and the belt is given a certain tension while holding the dancer at a fixed position. Things.

According to the above construction, the loop amount of the loop forming means is controlled by changing the position of the dancer, and the loop control corrects the position of the dancer through the band while pulling or loosening the band with respect to the dancer. ,
With this correction, it is possible to control the tension of the belt-like body on the winding side to be substantially constant while suppressing the swing of the dancer.

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, the form described below is
Although the present invention is a preferred specific example of the present invention, various technically preferable limits are given. However, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description. It is not limited to.

FIG. 1 is a schematic configuration diagram of a strip-shaped body winding device shown as a preferred embodiment of the present invention, and shows a case where an electrode is wound in a manufacturing process of a lithium ion secondary dry battery. In FIG. 1, reference numeral 1 denotes a belt-like body,
The strip 1 is formed as a continuous strip, and is formed by applying a lithium compound to a base material such as a copper foil or an aluminum foil in a previous step. The strip 1 is wound around a supply reel 3 and set on the supply shaft 2 together with the supply reel 3. The belt 1 set on the supply shaft 2 together with the supply reel 3 includes a guide roller 4.
a, 4b, 4c, 4d, 4f, 4g, 4h, etc., and are wound on a winding reel 6 mounted on a winding shaft 5 rotated by a motor 33 (see FIGS. 2 and 3). Can be Note that the winding reel 6 on the winding shaft 5 here includes:
In a state where the strip A1, the separator A7, the strip B1, and the separator B7 are sequentially stacked, a total of four sheets, that is, two types of strips A and B and two separators 7, are stacked and wound simultaneously.

The take-up reel 6 on the take-up shaft 5
After the tape 1 has been taped to prevent unwinding, the strip 1 is transported in the element state to the next assembling step. Here, even in this winding method, when the belt-shaped body 1 is wound around the winding reel 6 at a high speed, there is a possibility that the winding may be shifted or tightened. Therefore, also in the apparatus of the present embodiment, a tension control device and a winding deviation correcting device for winding the band 1 on the take-up reel 6 while adjusting the tension of the band 1 are incorporated.

First, the detailed structure of the tension control device will be described. The dancer 10 is for forming a loop 11 of the band 1 between the guide rollers 4d and 4e in a fixed amount or a predetermined size. , A roller 10b attached to the tip of the lever 10a, and the lever 10a pivotally urged to apply a constant force in a direction in which the roller 10b contacts the surface of the belt-shaped body 1. And a spring 9 as tension applying means. An encoder ED is attached to the base end side of the lever 10a, so that the deflection angle of the lever 10a can be electrically extracted as a signal T1 from the encoder ED. And dancer 10
The roller 10b is always in contact with the surface of the belt 1 with the bias of the spring 9, and the guide rollers 4d, 4
When the tension between the lever 10a and the lever 10a becomes larger than the urging force of the spring 9, the lever 10a
Rotates together with the roller 10b, and when it becomes smaller, the loop 11
Move in the direction in which the roller 10 becomes larger.
By controlling the feeding amount of the band-shaped body 1 so as to prevent the band b from being moved at a fixed position and keeping the tension between the guide rollers 4d and 4e constant, the dancer 1
A method of controlling while preventing 0 from fluctuating greatly is adopted.

Reference numeral 12 denotes a tension control device. The tension controller 12 is formed as a board having a microprocessor, and outputs a tension correction signal TC based on a deviation (TC) between a signal T1 from the encoder ED and a tension set value TR.

Reference numeral 13 denotes a buffer unit as loop forming means for forming a loop of the band 1 between the supply shaft 2 and the dancer 10. This buffer unit 13 is provided between the guide rollers 4b and 4c. The buffer unit 13 also includes a roller 13a for forming a loop 19 between the guide roller 4b and the guide roller 4c, a moving body 13b to which the roller 13a is attached, and a screw feed of the moving body 13b. When the ball screw 13c and the moving body 13b are screw-fed,
It is composed of a linear guide 13e for guiding the moving body 13b to move up and down linearly without rotating, a servomotor 13d for rotating the ball screw 13c, and an encoder EB for detecting the rotation of the servomotor 13d. ing. In the buffer unit 13, the ball screw 13c rotates in a direction corresponding to the rotation direction of the servo motor 13d, and when the ball screw 13c rotates, a direction corresponding to the rotation direction and the rotation amount of the ball screw 13c. The moving body 13b is the roller 1
It moves up or down together with 3a, and has a structure in which the increase and decrease of the loop 19 formed by the roller 13a is controlled.

Reference numeral 14 denotes a position control device. The position control device 14 is formed as a board having a microprocessor, and a difference (P) between the signal P1 from the encoder EB and the tension correction signal TC from the tension control device 12 is obtained.
R) to output a position correction signal PC. Then, the servo motor 13d is driven by the position correction signal PC.

Reference numeral ES denotes an encoder for detecting the deflection position of the guide roller 4a, and reference numeral ET denotes the guide roller 4a.
This is an encoder that detects the shake position of f. Reference numeral 21 denotes a displacement detection sensor, which is used in a displacement correction device 20 described later. Therefore, the position shift detecting sensor 21 will be described in the description of the position shift correcting device 20.

Next, the structure of the displacement correcting device 20 will be described. The structure of the displacement correcting device 20 is shown in FIG. 2 and FIG. That is, FIG. 2 is a top view showing a part of the position shift correcting device 20 cut away, and FIG. 3 is a side view showing a part of the position shift correcting device 20 cut away from the direction of arrow A in FIG. is there. In FIGS. 2 and 3, the same reference numerals as those in FIG. 1 denote the same components as those in FIG.

2 and 3, the auxiliary plate 23
Is fixedly mounted on the base plate 22 and has a width position correcting mechanism 25 on the auxiliary plate 23 for sliding the slide base 24 toward or away from the base plate 22.
Is provided.

The width position correcting mechanism 25 is mounted on the rotating shaft 26a via a coupling 28 so as to be integrally rotatable with a width position correcting motor 26 arranged with the rotating shaft 26a oriented substantially perpendicular to the base plate 22. And the rod 29 that is provided. The rod 29 is rotatably held via a pair of bearing members 35 mounted on the auxiliary plate 23, and a screw is engraved on the outer periphery. Further, the arm portion 24a of the slide base 24 is screwed to the screw portion of the rod 29. When the rod 29 is rotated together with the rotation shaft 26 a of the width position correcting motor 26, the slide base 24 is screw-fed, and the rotation direction of the slide base 24 approaches or moves away from the base plate 22. And slide according to the amount of rotation.

The slide base 24 is a base plate 2
Main body 24b arranged opposite to the back side of 2
And an auxiliary plate portion 24 disposed on the auxiliary plate 23 at a position corresponding to the auxiliary plate 23 so as to face the auxiliary plate 23.
c and the arm portion 24a are integrally provided, are held by means not shown, and are slidably disposed in a direction approaching or moving away from the base plate 22. Here, openings are provided at positions of the base plate 22 corresponding to the guide rollers 4a to 4h, the dancer 10, the buffer unit 13 and the supply shaft 2 for releasing these members. The guide rollers 4a to 4h, the dancer 10, the buffer unit 13, and the supply shaft 2 are mounted on a slide base 24, and are integrated with the slide base 24.
It is structured so that it can move in a direction perpendicular to 2. In addition,
The displacement detection sensor 21 is not mounted on the slide base 24 but is fixedly mounted on the base plate 22.

To further explain the configuration on the slide base 24, the supply shaft 2 is rotatably supported on the slide base 24 via a bearing 30 and a bearing holding member 31. Further, a rotation shaft 33a of a supply motor 33 mounted on the auxiliary plate portion 24c of the slide base 24 via a holder 32 is coupled to the supply shaft 2 via a coupling 34 so as to be integrally rotatable. . Therefore, the supply shaft 2 rotates integrally with the rotation shaft 33 a of the supply motor 33 and draws out the band 1 from the supply reel 3.

The displacement detecting sensor 21 is arranged on the base plate 22 so that the band 1 passes through the inside thereof, detects the edge of the band 1, and detects the edge of the band 1 When it is displaced in a direction approaching or away from it, a signal corresponding to this displacement is output to the width position correction control device 40. The width position correction control device 40 is formed as a board having a microprocessor, and has a width position correction signal P4 based on a deviation (P4) between the signal P2 from the position shift detection sensor 21 and the width position setting signal P3. Is output.

Next, the operation of the belt winding device will be described. First, the belt-like body 1 fed from the supply reel 3 rotating integrally with the supply shaft 2 rotated by the supply motor 33 as a driving source is provided with guide rollers 4a, 4b,
a, the guide rollers 4c, 4d, the roller 10b, the guide rollers 4e, 4f, 4g, the displacement detecting sensor 21, and the guide roller 4h are taken up by the take-up reel 6 on the take-up shaft 5. More specifically, the belt 1 fed from the supply reel 3 is fed toward the dancer 10 while a loop 19 is formed in the buffer unit 13 by the rollers 13a.

In the part of the dancer 10, the roller 1
0b is pressed against the surface of the band 1 by the urging force of the spring 9, and the pressing force is balanced with the tension of the band 1 at the loop 11, and the dancer 10 is usually stationary at the same position. However, when the tension in the loop 11 becomes smaller than the pressing force of the spring, the dancer 10 rotates downward while increasing the amount of the loop 11 and oscillates.
And swings upward while reducing the amount of And
The amount of shake of the dancer 10 is detected by the encoder ED and output as a signal T1, and a signal (TC) corresponding to a deviation between the signal T1 and the tension set value TR is used as the tension control device 12
Is input to Then, the deviation (T
A tension correction signal TC based on C) is output to the position controller 14.

On the other hand, on the position control device 14 side, a position correction signal PC based on the deviation (PR) between the signal P1 from the encoder EB and the tension correction signal TC from the tension control device 12
To drive the servo motor 13d. The direction of rotation (sway) of the servo motor 13d differs depending on the magnitude of the tension in the dancer 10. When the servo motor 13d is rotated in the forward direction, the moving body 13b moves upward to reduce the amount of the loop 19, and When rotated in the direction, the moving body 13b is moved downward to increase the amount of the loop 19. That is, when the moving body 13b is moved upward to reduce the amount of the loop 19, the dancer 1
The amount of the band 1 fed to the zero side increases. Then
The tension in the part of the dancer 10 is reduced. Conversely, when the moving body 13b is moved downward to increase the amount of the loop 19, the dancer 1
The amount of the strip 1 fed to the zero side decreases. Then
The tension in the part of the dancer 10 increases. Therefore, the deflection position of the dancer 10 is known from the signal from the encoder ED, and the loop 19 on the buffer unit 13 side is controlled in accordance with the signal, thereby stopping the dancer 10 at a predetermined position and keeping the tension substantially constant. can do. Accordingly, in this structure, the position of the dancer 10 is corrected by controlling the loop 19, and the tension is controlled to be substantially constant while the deflection of the dancer 10 is eliminated by this correction. This makes it possible to wind the belt-like body 1 while applying a substantially constant tension to the winding reel 5 even when winding is performed at a high speed.

When the edge of the band 1 is detected to be misaligned by a signal from the misalignment detection sensor 21 during winding, the width position correction control device 40 outputs a width position correction signal P4. The width position correcting motor 26 is rotated in the positive or negative direction according to the position correction signal P4.
Then, the entire slide base 24 is moved in a direction approaching or away from the base plate 22 according to the rotation direction. That is, by the movement of the slide base 24, the supply shaft 2, the supply reel 3, the guide roller 4
a, 4b, roller 13a (dancer 10), guide rollers 4c, 4d, roller 10b, guide rollers 4e, 4
f, 4g, and the guide roller 4h are moved integrally with the slide base 24, and the traveling trajectory of the strip 1 is corrected. The correction of the traveling trajectory eliminates a winding deviation, and the band-like body 1 can be wound around the winding reel 6 with good alignment while suppressing the misalignment of both end faces. Therefore, this facilitates the work in the next step.

FIG. 4 is a schematic structural view showing a modification of the belt-shaped body winding device of the present invention. In FIG. 4, components denoted by the same reference numerals as those in FIGS. 1 to 3 indicate the same components as those in FIGS. Therefore, in the following description, duplicated descriptions will be avoided as much as possible, and different configurations will be described in detail. In this modified example, the embodiment shown in FIG. 1 corrects the position of the dancer 10 after a change in the tension appears in the signal of the encoder ED as a change in the angle of the dancer 10, but first, the supply is performed. The magnitude of the tension at the guide roller 4a, which varies with the feeding speed of the band 1 on the winding side, is obtained as a signal PS from the encoder ES, and the tension at the guide roller 4f, which varies with the feeding speed of the band 1 at the winding side, is obtained. Encoder E size
T as a signal PT, and a signal PCC of this speed difference
Is added to the position control device 14, and the servo motor 13d of the buffer unit 13 is driven to correct the position of the dancer 10. Further, the servo motor 13d is driven by the position correction signal PC based on the deviation (PR) between the signal TC from the encoder ED and the signal P1 from the encoder EB, and fine adjustment of the tension is performed in the same manner as in the embodiment of FIG. I do.
Therefore, in this modified example, the guide rollers 4a and 4f
Since the tension of the dancer 10 is controlled by controlling the position of the dancer 10 with the tension difference ((PCC)), further fine adjustment is performed by the dancer 10 and the buffer unit 13, so that the accuracy is more stable and accurate. Adjustments can be made.

FIG. 5 is a schematic structural view showing another modification of the belt-shaped body winding device of the present invention. 1 to 3 in FIG.
Those denoted by the same reference numerals as those shown in FIGS. Therefore, in the following description, duplicated descriptions will be avoided as much as possible, and different configurations will be described in detail. In this modified example, the tension is applied to the band 1 by the spring 9 in the embodiment of FIG. 1, but a predetermined tension is applied by bringing the dancer 10 into contact with the band 1 using the servomotor 41. It is like that. The magnitude of the tension applied by the servo motor 41 to the band 1 is
It is determined by a command signal TR applied to the tension (torque) control device 42 from a host device. Other configurations and operations are the same as those of the embodiment shown in FIG.

In the above embodiment, the electrode winding device for winding the electrode material in the manufacturing process of the lithium ion secondary battery has been described. However, the present invention can be similarly applied to the case of winding other belts. Things. Also,
Although the structure of the band-shaped body winding device incorporating the width position correcting mechanism has been disclosed, a similar effect can be obtained even with a structure not incorporating the width position correcting mechanism.

[0028]

As described above, according to the present invention,
The change in the position of the dancer controls the amount of loop of the loop forming means, and the loop control corrects the position of the dancer through the band while pulling or loosening the band with respect to the dancer. While the tension of the belt-like body on the winding side can be controlled to be substantially constant, high-speed response tension control can be performed, and at the time of high-speed winding, winding displacement and tightness can be prevented. And other effects can be expected.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a belt-shaped body winding device shown as one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a displacement correction mechanism in the apparatus of the present invention.

FIG. 3 is a schematic configuration diagram of a displacement correction mechanism as viewed from the direction of arrow A in FIG. 2;

FIG. 4 is a schematic configuration diagram showing a modified example of the device of the present invention.

FIG. 5 is a schematic configuration diagram showing another modified example of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt 2 Supply shaft 5 Winding shaft 9 Spring (tensile biasing means) 10 Dancer 11, 19 Belt loop 12, 42 Tension control device (or means) 13 Buffer unit (loop forming means) 14 Position control device ( 20 Position shift correction device (or means) 21 Position shift detection sensor 25 Width position correction mechanism 40 Width position correction control device (or means) ED encoder (Rotation angle detection means) ES, ET, EB encoder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01M 10/40 H01M 10/40 Z

Claims (5)

[Claims] 1. A tensioner for applying tension to a belt-like body that is fed from a supply shaft and wound around a winding shaft by bringing the other end of a dancer rotating around one end into contact with the belt-like body. A tension applying means for constantly applying a constant force to apply tension to the belt-shaped body to the dancer; a rotation angle detecting means for detecting a swing angle of the dancer; a reference signal And a tension control unit that receives an output signal from the rotation angle detection unit and outputs a signal based on a deviation between the two signals; and a loop that is provided between the supply shaft and the dancer and loops through the band-shaped body. Loop forming means to be formed; and position control means for controlling the amount of loop formed by the loop forming means in accordance with an output signal from the tension control means to suppress the swing of the dancer. A tension control device for a belt-shaped body. 2. The tension of the band between the supply shaft and the loop forming means and the tension of the band between the dancer and the winding shaft are respectively detected, and a signal of each tension is detected at the position. 2. The tension control device for a belt-shaped body according to claim 1, further comprising means for inputting to the control means. 3. The tension control device for a belt-shaped body according to claim 1, further comprising: a servomotor as the tension control means; and means for applying a torque for rotating the dancer to the servomotor as an electric signal. 4. The tension control of a belt-shaped body according to claim 1, further comprising a width position correcting mechanism for detecting a position of an edge of the band-shaped body toward the winding axis and correcting a traveling trajectory of the band-shaped body. apparatus. 5. A tension is applied to the belt-like body by bringing the other end side of a dancer rotating around one end into contact with the belt-like body fed from the supply shaft and wound on the winding shaft. In the tension control method, a constant force for applying tension to the belt-like body is always applied to the dancer, and a loop is formed on the front side of the dancer, and the amount of the loop is increased or decreased according to the swing angle of the dancer. Wherein a predetermined tension is applied to the band while holding the dancer at a predetermined position.