JP6114513B2 - Tension control device, transport device, and tension control method - Google Patents

Description

  The present invention relates to a tension control device that adjusts tension when a long workpiece is transported, a transport device including the tension control device, and a tension control method.

  As a device for handling a long workpiece, there are a winding device for manufacturing a winding element such as an aluminum electrolytic capacitor and an electric double layer capacitor, a printing device for printing on various films, and the like. In such an apparatus, when the workpiece is conveyed in the longitudinal direction, it is necessary to apply a predetermined tension to the workpiece to prevent the workpiece from becoming slack. Further, in the above apparatus, the work is retained by using a dancer roller or the like during a period in which a difference occurs between the work feeding speed in the feeding apparatus and the work winding speed in the winding apparatus. It is necessary to prevent the occurrence of slack or the like.

  Therefore, a dancer roller disposed between a pair of fixed rollers is urged by a spring to apply a predetermined tension to the workpiece, and a movable roller disposed between another pair of fixed rollers is displaced by a motor. Thus, a technique for absorbing slack caused by the difference between the workpiece feeding speed and the workpiece winding speed in the winding device has been proposed (see Patent Document 1).

JP2012-12192A

  However, in the configuration described in Patent Document 1, the tension control mechanism that adjusts the tension of the workpiece and the buffer mechanism that absorbs the difference between the workpiece feeding speed and the workpiece winding speed are separate mechanisms. There is a problem that the configuration becomes large. Further, in the tension control mechanism described in Patent Document 1, since the tension of the workpiece is defined by the spring, it is impossible to bring the magnitude of the tension close to substantially 0 while preventing looseness.

  In view of the above problems, an object of the present invention is to provide a tension control device, a transport device, and a tension control method capable of performing tension control and a buffer with a common mechanism.

  The present invention further provides a tension control device, a transport device, and a tension control method that can set the size of the tension to an arbitrary size, such as a minimum size, while preventing looseness. It is to provide.

In order to solve the above-described problem, a tension control device according to the present invention includes a pair of fixed rollers in which one surface side of the workpiece is hung at a midway position in a conveyance path of a long workpiece, and the pair of fixed rollers. And a movable unit provided with a tension adjusting roller on which the other surface side of the workpiece is suspended, a detection device for detecting a force received by the tension adjusting roller from the workpiece, and a direction in which the movable unit is separated from the pair of fixed rollers And a driving device that drives in a direction approaching the pair of fixed rollers, and the pair of fixing of the tension adjusting roller by controlling the driving device so that a detection value of the force in the detection device becomes a set value. by adjusting the distance from the roller, have a, and a control unit for adjusting the tension of the workpiece, the pair of fixing rollers in the horizontal direction It is arranged at a position between the tension adjustment roller, the disposed from below the pair of fixing rollers, the drive, and drives the movable unit in the vertical direction.

In addition, the tension control method according to the present invention includes a pair of fixed rollers in which one surface side of the workpiece is suspended at a midway position in a long workpiece conveyance path, and the other surface of the workpiece between the pair of fixed rollers. A tension adjusting roller having a side mounted thereon, and a driving device that drives the tension adjusting roller in a direction away from the pair of fixed rollers and a direction approaching the pair of fixed rollers. value was detected force from the controls the driving device so that the set value by adjusting the distance from the pair of fixed rollers of the tension adjustment roller, to adjust the tension of the workpiece, the pair The fixed roller is disposed at a position spaced apart in the horizontal direction, and the tension adjusting roller is disposed below the pair of fixed rollers. It is the drive, and drives the movable unit in the vertical direction.

  In the present invention, a tension adjustment roller is provided between the pair of fixed rollers, and the tension adjustment roller includes a direction in which the tension adjustment roller is separated from the pair of fixed rollers and a direction in which the pair of fixed rollers is approached. A driving device for driving is provided. For this reason, if the driving device is controlled so that the value detected by the tension adjusting roller receiving the force from the workpiece becomes the set value, the distance from the pair of fixed rollers of the tension adjusting roller is adjusted. In addition, the drive device drives the tension adjusting roller in a direction away from the pair of fixed rollers and in a direction approaching the pair of fixed rollers. Even when there is a difference between the workpiece conveyance speed on the downstream side of the tension adjustment roller, the tension adjustment roller is driven by the driving device and functions as a dancer roller. Therefore, the tension control and the buffer can be performed by a common mechanism.

  In the present invention, the detection device preferably includes a load cell that detects a load applied to the tension adjustment roller. According to this configuration, it is possible to eliminate slackness while making the magnitude of the tension substantially zero.

  In the present invention, the detection device includes an elastic support member that displaceably supports the tension adjustment roller on the movable unit in a direction away from the pair of fixed rollers and a direction approaching the pair of fixed rollers, You may employ | adopt the structure provided with the displacement meter which detects the position of the said tension adjustment roller on a movable unit.

  The tension control device according to the present invention can be used for a transport device or the like. In this case, the transport device winds the work that has been transported through the transport path and the feeding device that feeds the work to the transport path. A take-up device.

  In this case, it is preferable that the control unit controls a feeding speed in the feeding device and a winding speed in the winding device.

  In the present invention, a tension adjustment roller is provided between the pair of fixed rollers, and the tension adjustment roller includes a direction in which the tension adjustment roller is separated from the pair of fixed rollers and a direction in which the pair of fixed rollers is approached. A driving device for driving is provided. For this reason, if the driving device is controlled so that the value detected by the tension adjusting roller receiving the force from the workpiece becomes the set value, the distance from the pair of fixed rollers of the tension adjusting roller is adjusted. Can be adjusted. Further, the drive device drives the tension adjusting roller in a direction away from the pair of fixed rollers and in a direction approaching the pair of fixed rollers, so that the workpiece conveyance speed on the upstream side of the tension adjusting roller and the downstream side of the tension adjusting roller. Even when a difference occurs between the workpiece conveyance speed and the tension adjusting roller, the tension adjusting roller is driven by the driving device and functions as a dancer roller. Therefore, the tension control and the buffer can be performed by a common mechanism.

It is a perspective view which shows typically the structure of the conveying apparatus to which this invention is applied. It is explanatory drawing of the tension control apparatus of the conveying apparatus to which this invention is applied. It is explanatory drawing which shows the structural example of another detection apparatus used for the conveying apparatus (tension control apparatus) to which this invention is applied.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the description will focus on a mode in which the workpiece is conveyed in the horizontal direction (X direction). Further, description will be made assuming that the vertical direction perpendicular to the X direction is the Y direction and the direction perpendicular to the X direction and the Y direction is the Z direction.

(Conveyor configuration)
FIG. 1 is a perspective view schematically showing a configuration of a transport apparatus to which the present invention is applied. FIG. 2 is an explanatory diagram of a tension control device of a transport device to which the present invention is applied. FIGS. 2A and 2B are a front view schematically showing the configuration of the tension control device and the like, and a tension adjusting roller. It is a perspective view which shows the periphery structure.

  1 and 2A is a device that transports a long film-shaped workpiece W in the X direction (horizontal direction). The workpiece W is transferred from a coil C1 around which the workpiece W is wound. A feeding device 10 that feeds out to the transport path 20 and a winding device 30 that winds the workpiece W transported through the transport path 20 into a cylindrical shape are provided.

  The feeding device 10 includes a drive source 11 composed of a servo motor and the like, and a transmission mechanism 12 that decelerates the rotation of the drive source 11 and transmits it to the shaft 13, and the coil C <b> 1 is attached to the shaft 13. In this embodiment, the shaft 13 rotates around a horizontal axis extending in the Z-axis direction. The winding device 30 includes a drive source 31 composed of a servo motor and the like, and a winding core 32 that is rotationally driven by the driving source 31, and the workpiece W conveyed to the winding device 30 is transferred by the winding core 32. It is wound around the cylindrical wound body C2. In this embodiment, the winding core 32 rotates around a horizontal axis extending in the Z-axis direction. Here, when the conveying device 1 is configured as a winding machine for manufacturing an element such as an electrolytic capacitor or an electric double layer capacitor, the workpiece W is another long workpiece (electrode) or It is wound with a separator (not shown) or the like. In this case, the wound body C2 may be wound in a perfect circle shape, or may be wound in an elliptical shape as shown in FIG. 1 and FIG. 2 (a). In any case, after the workpiece W is wound around the winding body C2 in the winding device 30, the conveyance of the workpiece W is stopped at the timing when the workpiece W is cut by a cutting device (not shown). When the transport device 1 is configured as a printing device that performs printing while transporting the workpiece W, the workpiece W is subjected to processing such as printing before being wound up by the winding device 30. In this case, the conveyance of the workpiece W is stopped at the timing of printing on the workpiece W.

  In this embodiment, the conveyance path 20 is configured by a plurality of rollers arranged from the feeding device 10 toward the winding device 30. More specifically, the transport path 20 includes four fixed rollers 21, 22, 23, and 24 arranged at a predetermined interval from the feeding device 10 toward the winding device 30, and the four fixed rollers 21. , 22, 23 and 24 all extend in the Z-axis direction. In this embodiment, the fixed rollers 22 and 23 are arranged at positions that are spaced apart in the X direction (horizontal direction) at substantially the same height, and the work W is in contact with the fixed rollers 22 and 23 on one side W1. As shown in FIG.

  In the transport device 1, the fixed rollers 21, 22, 23, and 24 are guide rollers that rotate at fixed positions, and the feed drive of the workpiece W is performed by the driving force of the winding device 30. At that time, the feeding device 10 feeds the workpiece W at the same speed as the winding speed by the winding device 30.

(Configuration of tension control device)
As shown in FIGS. 1 and 2A and 2B, in this embodiment, a tension adjusting roller 41 is disposed between the fixed rollers 22 and 23. Work W is laid so that direction W2 may touch. In this embodiment, the tension control device 40 is configured by using the tension adjusting roller 41 and the fixed rollers 22 and 23.

  More specifically, the tension control device 40 includes fixed rollers 22 and 23, a tension adjustment roller 41, and a movable unit 43 including a detection device 42 that detects the force that the tension adjustment roller 41 receives from the workpiece W. doing. Further, the tension control device 40 detects the drive unit 50 that drives the movable unit 43 in a direction (downward) away from the pair of fixed rollers 22 and 23 and in a direction closer to the pair of fixed rollers 22 and 23 (upward). The drive device 50 is controlled so that the detection value of the force in the device 42 becomes a set value, and the distance (the height position of the tension adjustment roller 41) of the tension adjustment roller 41 from the pair of fixed rollers 22 and 23 is adjusted. And a control unit 60.

  The movable unit 43 includes a movable plate 44 that rotatably supports the tension adjustment roller 41 about a horizontal axis extending in the Z direction, and a detection device 42 provided between the movable plate 44 and the tension adjustment roller 41. In this embodiment, the detection device 42 includes a load cell 46 that detects a load that the tension adjustment roller 41 receives from the workpiece W.

  The drive device 50 includes an actuator 51 that constitutes a ball screw mechanism, and a cover 52 that covers the screw shaft of the actuator 51, and a nut and a movable unit of the ball screw mechanism via a groove 520 that opens on the side surface of the cover 52. 43 movable plates 44 are connected.

  In this embodiment, the control unit 60 includes a microcomputer or the like, and detects a load received by the tension adjusting roller 41 from the workpiece W from the detection device 42 (load cell 46) to the control unit 60 as indicated by an arrow S1. Results are output. Further, the control unit 60 controls the drive device 50 as indicated by an arrow S2, and the control unit 60 outputs the output level from the detection device 42 (load cell 46) (the load that the tension adjusting roller 41 receives from the workpiece W). The height position of the movable unit 43 (tension adjusting roller 41) (distance from the fixed rollers 22 and 23) is controlled so that the size of the movable unit 43 (tension adjusting roller 41) is constant.

  In this embodiment, the control unit 60 controls the feeding device 10 as indicated by an arrow S3, and controls the start, stop, feeding speed, and the like of the workpiece W. The control unit 60 controls the winding device 30 as indicated by an arrow S4, and controls the start, stop, winding speed, and acceleration / deceleration of winding of the workpiece W. A signal such as the angular position of the core 32 is output from the winding device 30 to the unit 60.

(Contents of tension control and main effects of this form)
In the transport device 1 of this embodiment, the workpiece W transported from the feeding device 10 through the transport path 20 to the winding device 30 is wound as a wound body C2 by the winding device 30. At that time, if a predetermined tension is not applied to the workpiece W, the workpiece W is loosened, and the wound body C2 is not properly wound. For this reason, a tension control device 40 is configured in the transport device 1, and the tension control device 40 controls the tension of the workpiece W.

  More specifically, when the tension of the workpiece W is small and the output level from the detection device 42 (load cell 46) to the control unit 60 is lower than the set value, the control unit 60 controls the movable unit 43 with respect to the drive device 50. The (tension adjusting roller 41) is lowered to command to increase the distance from the fixed rollers 22 and 23. As a result, the driving device 50 lowers the movable unit 43 (tension adjusting roller 41), so that the tension of the workpiece W increases. On the other hand, when the tension of the workpiece W is large and the output level from the detection device 42 (load cell 46) to the control unit 60 is higher than the set value, the control unit 60 makes the movable unit 43 ( The tension adjustment roller 41) is raised to command the distance from the fixed rollers 22, 23 to be small. As a result, the driving device 50 raises the movable unit 43 (tension adjusting roller 41), so that the tension of the workpiece W decreases.

  Accordingly, the tension of the workpiece W is maintained at the set value. In addition, since the tension control described above is continuously performed in a short cycle, the tension of the workpiece W is always maintained at the set value. In addition, the tension control described above performs correction when the tension of the workpiece W deviates from the set value based on the position of the movable unit 43 (tension adjustment roller 41), so that the tension of the workpiece W can be set steplessly. .

  Here, the winding device 30 winds the workpiece W into a cylindrical shape. For this reason, as the diameter of the wound body C2 increases, the length dimension (peripheral length of the wound body C2) around which the workpiece W is wound around the wound body C2 changes per unit time. Since this state is the same state as the winding speed is changed, the tension varies. Even in such a case, in this embodiment, the control unit 60 feeds back the detection result of the detection device 42 (load cell 46) to the drive device 50, so that the tension of the workpiece W is maintained at the set value. Therefore, as the diameter of the wound body C2 increases, the tension of the workpiece W is maintained at the set value without changing the winding speed in the winding device 30 and the feeding speed in the feeding device 10. Therefore, the work W can be wound appropriately.

  In particular, in this embodiment, the winding device 30 winds the workpiece W in an elliptical shape. For this reason, as the direction of the large diameter direction and the small diameter direction changes as the winding core 32 rotates, the circumferential length of the wound body C2 changes. Since this state is the same state as the winding speed is changed, the tension varies. Even in such a case, in this embodiment, the control unit 60 feeds back the detection result of the detection device 42 (load cell 46) to the drive device 50, so that the tension of the workpiece W is maintained at the set value. Therefore, the tension of the workpiece W is maintained at the set value without changing the winding speed in the winding device 30 or the feeding speed in the feeding device 10 as the angular position of the wound body C2 changes. Therefore, the workpiece W can be wound appropriately.

  Further, the work W is fed out from the feeding device 10 continuously, while the work W is taken up intermittently in the winding device 30. For this reason, a difference occurs between the conveyance speed of the workpiece W on the upstream side of the tension adjustment roller 41 and the conveyance speed of the workpiece W on the downstream side of the tension adjustment roller 41. Even in such a case, in the present embodiment, the control unit 60 feeds back the detection result of the detection device 42 (load cell 46) to the drive device 50, so that the tension of the workpiece W is maintained at the set value. Therefore, while the winding by the winding device 30 is stopped, the tension adjusting roller 41 continues to descend, and thus functions as a buffer for storing excess work W. Therefore, according to the present embodiment, the tension control device 40 can perform the tension control and the buffer with a common mechanism, so that the device configuration can be simplified.

  In the present embodiment, since the load cell 46 that detects the magnitude of the load that the tension adjusting roller 41 receives from the work W is used as the detection device 42, it is not necessary to apply an extra force to the work W. That is, since the load cell 46 is a strain gauge that detects strain caused by a load, the tension adjustment roller 41 does not need to be movable in the vertical direction on the movable unit 43. For this reason, since an extra force is not applied to the detection device 42, a smaller load can be detected as the value approaches 0. Accordingly, the tension of the workpiece W can be arbitrarily set such that the tension can be set to a minimum level as it is close to approximately zero.

[Another configuration example of the detection device 42]
FIG. 3 is an explanatory diagram showing a configuration example of another detection device 42 used in the transport device 1 (tension control device 40) to which the present invention is applied. FIGS. 3 (a) and 3 (b) show the detection device 42. FIG. 6 is an explanatory diagram when a fluid pressure cylinder is used, and an explanatory diagram when a tension coil spring is used for the detection device.

  In the embodiment described with reference to FIG. 1 and FIGS. 2A and 2B, the load cell 46 is used as the detection device 42. However, as described with reference to FIG. Position of the tension adjusting roller 41 on the movable unit 43, and an elastic support member 45 that supports the tension adjusting roller 41 in a direction away from the fixed rollers 22 and 23 and a direction away from the fixed rollers 22 and 23. A configuration provided with a displacement meter 47 for detecting the above may be adopted.

  More specifically, the movable unit 43 of the tension control device 40 shown in FIG. 3A includes a guide plate 48 fixed to the movable plate 44 and a support plate 49 that supports the tension adjusting roller 41. A guide mechanism for guiding the support plate 49 in the vertical direction is provided, and the tension adjusting roller 41 can be displaced in the vertical direction on the movable unit 43. Here, a fixed portion 451 of an elastic support member 45 including a fluid pressure cylinder device 45a such as an air cylinder device or an oil cylinder device is fixed to the movable plate 44, and the support plate 49 includes a fluid pressure cylinder device 45a. The movable part 452 of the elastic support member 45 is fixed. As the elastic support member 45, a cylinder device using spring pressure may be used instead of the fluid pressure cylinder device 45a.

  According to such a configuration, the vertical position of the tension adjusting roller 41 changes according to the magnitude of the tension received from the workpiece W. Therefore, if the displacement meter 47 detects the position of the tension adjustment roller 41, the magnitude of the load that the tension adjustment roller 41 receives from the workpiece W can be detected. Accordingly, the control unit 60 shown in FIG. 1 is configured so that the output level from the detection device 42 (displacement gauge 47) (the magnitude of the load that the tension adjusting roller 41 receives from the workpiece W) is constant. The tension of the workpiece W can be adjusted by controlling the height position of the adjustment roller 41) (distance from the fixed rollers 22 and 23).

  Further, the movable unit 43 of the tension control device 40 shown in FIG. 3B includes a support plate 49 between a guide plate 48 fixed to the movable plate 44 and a support plate 49 that supports the tension adjusting roller 41. The tension adjusting roller 41 is displaceable in the vertical direction on the movable unit 43. Here, between the convex part 490 of the support plate 49 and the convex part 440 of the movable plate 44, the edge parts 453 and 454 of the elastic support member 45 which consist of the tension coil spring 45b are hold | maintained.

  According to such a configuration, the vertical position of the tension adjusting roller 41 changes according to the magnitude of the tension received from the workpiece W. Therefore, if the displacement meter 47 detects the position of the tension adjustment roller 41, the magnitude of the load that the tension adjustment roller 41 receives from the workpiece W can be detected. Accordingly, the control unit 60 shown in FIG. 1 is configured so that the output level from the detection device 42 (displacement gauge 47) (the magnitude of the load that the tension adjusting roller 41 receives from the workpiece W) is constant. The tension of the workpiece W can be adjusted by controlling the height position of the adjustment roller 41) (distance from the fixed rollers 22 and 23).

[Other embodiments]
In the above embodiment, the tension control device 40 is configured as a vertical damper device in which the tension adjustment roller 41 is displaced in the vertical direction. However, the tension control device 40 is configured as a horizontal damper device in which the tension adjustment roller 41 is displaced in the horizontal direction. May be configured.

DESCRIPTION OF SYMBOLS 1 Conveyance apparatus 10 Feeding apparatus 20 Conveyance path | routes 22 and 23 Fixed roller 30 Winding apparatus 40 Tension control apparatus 41 Tension adjustment roller 42 Detection apparatus 43 Movable unit 45 Elastic support member 45a Fluid pressure cylinder apparatus 45b Pulling coil spring 46 Load cell 47 Displacement meter 50 Driving device 60 Control unit C1 Coil C2 Winding body W Workpiece

Claims (6)

A pair of fixed rollers on which one side of the workpiece is suspended at a midway position in the conveyance path of the long workpiece;
A tension adjusting roller having the other surface of the workpiece spanned between the pair of fixed rollers, and a movable unit including a detection device that detects a force that the tension adjusting roller receives from the workpiece;
A driving device for driving the movable unit in a direction away from the pair of fixed rollers and in a direction approaching the pair of fixed rollers;
The tension of the workpiece is adjusted by adjusting the distance from the pair of fixed rollers of the tension adjusting roller by controlling the driving device so that the detection value of the force in the detection device becomes a set value. A control unit;
I have a,
The pair of fixed rollers are disposed at positions spaced apart in the horizontal direction,
The tension adjusting roller is disposed below the pair of fixed rollers,
The tension control device characterized in that the drive device drives the movable unit in the vertical direction . The tension control device according to claim 1, wherein the detection device includes a load cell that detects a load applied to the tension adjusting roller . The detection device includes an elastic support member that supports the tension adjustment roller so as to be displaceable on the movable unit in a direction away from the pair of fixed rollers and in a direction of approaching the pair of fixed rollers, and on the movable unit. The tension control device according to claim 1, further comprising a displacement meter that detects a position of the tension adjusting roller . A conveying device comprising the tension control device according to any one of claims 1 to 3,
A feeding device for feeding the workpiece to the conveyance path;
A winding device for winding the workpiece that has been conveyed through the conveying path;
A conveying device characterized by comprising: The control unit includes a feeding speed in the feeding device and a winding speed in the winding device.
The conveying apparatus according to claim 4, wherein a take-off speed is controlled . A pair of fixed rollers on which one side of the workpiece is suspended at a midway position in the conveyance path of the long workpiece; a tension adjusting roller on which the other surface of the workpiece is suspended between the pair of fixed rollers; and the tension A driving device for driving the adjusting roller in a direction away from the pair of fixed rollers and a direction approaching the pair of fixed rollers;
By controlling the drive device so that a value obtained by detecting the force received by the tension adjusting roller from the workpiece becomes a set value, and adjusting the distance of the tension adjusting roller from the pair of fixed rollers, Adjust the tension,
The pair of fixed rollers are disposed at positions spaced apart in the horizontal direction,
The tension adjusting roller is disposed below the pair of fixed rollers,
The tension control method, wherein the driving device drives the movable unit in a vertical direction.

Images