JP5709310B2 - Web transport device - Google Patents

Description

  The present invention relates to a web transport apparatus that transports the web while controlling a web transport path and a tension acting on the web.

  Conventionally, so-called web guiders are known as means for adjusting the position of the edge of the web during conveyance. (Japanese Patent Laid-Open Nos. 57-102457, 2002-128350, and 2004-43179) A web guider has a guide bar around which a web is wound, and this guide bar is positioned at the edge position of a downstream web. The web edge is controlled so that the edge of the web becomes a predetermined position. (Japanese Patent Laid-Open No. 2001-48386)

On the other hand, a tension control device is known as a device for controlling the tension of the transport web.
The tension control device includes a dancer roll that is wound around the web and moves according to the tension of the web, and a drive roll that drives the web according to the position of the dancer roll.

JP 57-102457 (front page) JP 2002-128350 (front page) JP-A-2004-43179 (front page) JP 2001-48386 (front page)

  However, while the web guider and the tension control device are indispensable for accurate conveyance of the web, both are separately provided in a series of manufacturing apparatuses, and a free roll is disposed between the two. The For this reason, the entire web guider and tension control device are increased in size, and further, it is difficult to unitize them.

  Accordingly, the main object of the present invention is to simplify the web transport device, reduce the number of parts and reduce the size, and a further object of the present invention is to provide a web transport device that can be used as a single unit. That is.

  In order to achieve the main object, the present invention provides a web transport apparatus for transporting the web while controlling a web transport path and a tension acting on the web, and a part of the web from upstream to downstream. And a guide bar that is moved around so that the downstream conveyance path of the web moves closer to a predetermined path, and the tension in the flow direction that is arranged downstream of the guide bar and that acts on the web. A dancer roll that swings to a corresponding position, and is disposed downstream of the guide bar and upstream of the dancer roll, and the web is arranged so that the dancer roll approaches a predetermined position. A driving roll driven while applying tension, and the roll is not provided to turn the web flow direction from the guide bar toward the driving roll. Characterized in that said web between Doba and the drive roll is stretched directly.

  According to the present invention, it is not necessary to interpose a free roll between the guide bar and the drive roll by directly passing the web between them. Therefore, it is possible to simplify the web transfer device having two functions of web guide and tension control, reduce the number of parts, and reduce the size.

  Incidentally, there is a frictional resistance between the guide bar and the web, and the magnitude of this frictional resistance varies for various reasons. For this reason, when the guide bar is arranged on the web path from the drive roll to the dancer roll, the fluctuation of the frictional force on the guide bar affects the downstream.

On the other hand, in the present invention, the guide bar is arranged upstream of the drive roll, so that the fluctuation of the frictional force in the guide bar will not affect the downstream.

It is a top view which shows one Example of the conveyance apparatus of the web of this invention. It is the same front view. It is the same schematic block diagram.

  In a preferred embodiment of the present invention, the axes of the guide bar, dancer roll, and drive roll extend along planes parallel to each other, and the drive roll and the guide bar run along a first plane. And the axis of the dancer roll is arranged parallel to the first plane, and the dancer roll is arranged between the guide bar and the drive roll in a plan view of the first plane.

  In this case, it becomes easy to arrange the guide bar, the drive roll, and the dancer roll in a compact manner.

  In another preferred embodiment of the present invention, the guide bar turns the web flow direction so that the first flow direction of the web introduced into the guide bar and the first direction of the web derived from the guide bar are changed. It further extends in a direction intersecting the two flow directions, and further includes a guide mechanism for guiding the movement of the guide bar so that the guide bar moves in parallel with the first or second flow direction. .

In this case, the web conveyance path can be changed by one guide bar as compared with a web guider formed by a plurality of rolls. Thus, the web transport device will be more compact.

In yet another preferred embodiment of the invention, the guide bar, dancer roll and drive roll are held on one common base.
In this case, mechanical unitization of the apparatus becomes easy.
In other words, the control of the web conveyance path and the control of the tension acting on the web are indispensable controls for processing the web with high accuracy. By unitizing a device that performs this control, The cost of the manufacturing apparatus can be reduced.

In still another preferred embodiment of the present invention, a web detecting device for detecting whether or not the web transport path is a predetermined path, a moving device for moving the guide bar, and the drive roll being driven to rotate. Driving device, a tension detecting device that detects the tension acting on the web by detecting the position of the dancer roll, and signals from both the detecting devices are inputted, and signals are sent to the moving device and the driving device. An output conveyance control device, and the case of the conveyance control device is provided separately from the case of the processing control device for processing the web derived from the dancer roll.

In this case, electrical unitization for controlling the apparatus is facilitated.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The transport apparatus for the web shown in FIG. 1 transports a web W that is a raw material for disposable wearing articles such as disposable diapers and pants.

  The web transport device transports the web W while controlling the transport path of the web W and the tension acting on the web W. The web is wound from the original fabric upstream of the web transport device. An unwinding device is provided, and a web W processing device 100 (FIG. 3) may be provided downstream of the web conveying device. As the processing apparatus 100, one or a plurality of apparatuses that fold the web W, overlap another web or an absorbent core on the web W, or cut the web W may be provided.

  The web transport apparatus includes a guide bar 1, a dancer roll 2, and a drive roll 3. The guide bar 1, the dancer roll 2 and the drive roll 3 of FIG. 2 are held on a common base 4.

  A part of the web W from the upstream D1 to the downstream D2 comes into contact with the guide bar 1 shown in FIG. The guide bar 1 is moved so that the conveyance path downstream of the web W approaches a predetermined path.

In this embodiment, the guide bar 1 is led out from the guide bar 1 and the first flow direction D1 of the web W introduced into the guide bar 1 in order to turn the flow direction of the web W approximately 90 °. The web W extends in a direction crossing the second flow direction D2. A guide mechanism 10 for guiding the movement of the guide bar 1 is provided so that the guide bar 1 moves in parallel with the first or second flow direction D1, D2.
The moving device 11 for moving the guide mechanism 10 and the guide bar 1 will be described later.

  In the case of the present embodiment, for example, the guide bar 1 moves parallel to the first flow direction D1. In this case, when the guide bar 1 moves in the first flow direction D1, the side edge We of the web W downstream of the guide bar 1 also moves in the first flow direction D1. On the other hand, when the guide bar 1 moves in the direction D11 opposite to the first flow direction D1, the side edge We of the web W downstream of the guide bar 1 also moves in the opposite direction D11.

  The side edges We on both sides of the web W are detected by the web detection devices 5 and 5. That is, the web detection device 5 detects whether or not the conveyance path of the web W is a predetermined path, and detects a pattern or the like attached to the surface of the web W instead of the detection of the side edge We. May be.

  As shown in FIG. 2, the dancer roll 2 is disposed downstream of the guide bar 1 and swings so as to be in a position corresponding to the tension in the flow direction acting on the web W.

That is, the dancer roll 2 can swing in the horizontal direction between the positions P1 and P2 at both ends indicated by a two-dot chain line with the target position P0 indicated by the solid line in FIG. 2 as the center, and the target position when the tension of the web W is small. It moves from P0 toward the upstream end position P1, and when the tension of the web W is large, it moves from the target position P0 toward the downstream end position P2.
The dancer roll 2 may reciprocate on a straight line or may reciprocate along an arc.

  The drive roll 3 is arranged downstream of the guide bar 1 and upstream of the dancer roll 2 and applies tension to the web W so that the position of the dancer roll 2 approaches the target position P0. However, it is rotationally driven by the drive device 31 of FIG. As shown in FIG. 2, the web W is directly stretched between the guide bar 1 and the drive roll 3, and the guide bar 1 and the drive roll 3 have the guide There is no roll that turns the flow direction of the web W from the bar 1 toward the drive roll 3. Thereby, the guide bar 1, the drive roll 3, and the dancer roll 2 can be arrange | positioned compactly.

In the case of the present embodiment, the axis lines 1L, 2L, 3L of the guide bar 1, the dancer roll 2, and the drive roll 3 each extend along a horizontal plane.
The drive roll 3 and the guide bar 1 are substantially along the same horizontal plane (an example of the first plane) so that the web W from the guide bar 1 toward the drive roll 3 flows along the horizontal plane. The drive roll 3 and the guide bar 1 are arranged at positions shifted vertically by the sum of the radii of both.
The dancer roll 2 is arranged in parallel to the drive roll 3 so that the web W from the drive roll 3 toward the dancer roll 2 is not twisted. That is, the dancer roll 2 is arranged in parallel to the horizontal plane and is arranged on a second plane parallel to the horizontal plane.

  In the case of this embodiment, the dancer roll 2 is disposed below the guide bar 1 and the drive roll 3, but the dancer roll 2 is disposed above the guide bar 1 and the drive roll 3. Also good.

  In this case, the dancer roll 2 may be disposed between the guide bar 1 and the drive roll 3 in a plan view of the horizontal plane. For example, the drive roll 3 is disposed at a position horizontally separated from the guide bar 1 and the dancer roll 2, and is disposed between the guide bar 1 and the dancer roll 2 in the horizontal direction. It does not have to be. Since such an arrangement has a large angle around the drive roll 3 around which the web W is wound, the drive force is easily transmitted from the drive roll 3 to the web W.

  In the wearing article manufacturing system, each roll or the like is arranged in a case that has a lower ceiling than the building and is long in the horizontal direction. Therefore, the arrangement of the bars and rolls 1 to 3 as described above may be suitable for downsizing the wearing article manufacturing system.

  The guide bar 1 and the drive roll 3 may be arranged so that the web W from the guide bar 1 toward the drive roll 3 flows along a vertical surface or an inclined surface.

Next, the moving device 11 that moves the guide bar 1 of FIG. 1 will be described.
The guide bar 1 is cantilevered at a support end 12 by a slider 13 which is guided and moved by a rail (guide mechanism) 10 extending along the first flow direction D1. The guide bar 1 may be rotatably supported by the support end portion 12.

The slider 13 is connected to an output shaft of a motor 15 with a speed reducer via a link 14 and an arm 16. As the motor 15 rotates forward and backward, the guide bar 1 moves in the first flow direction D1 and the reverse direction D11 via the slider 13 and the support end 12.

  As shown in FIG. 1, the rail 10 and the motor 15 may be supported on a cantilever 17 protruding from the base 4 in the direction D11.

  Next, the tension detector 6 shown in FIG. 2 will be described. The tension detecting device 6 is for detecting the tension acting on the web W by detecting the position of the dancer roll 2.

  In FIG. 1, the dancer roll 2 is movably supported on a base 4 via a rail 20 and a slider 21.

As shown in FIG. 2, the rail 20 extends in the horizontal direction (second flow direction D2). The slider 21 (FIG. 1) is connected to a load device 22 that applies a load in the second flow direction D2 to the dancer roll 2. The load device 22 stabilizes the position of the dancer roll 2 by pulling the slider 21 in the direction opposite to the second flow direction D2 in the state shown by the solid line in FIG.

The load device 22 applies a small load to the dancer roll 2 at the position P2 and a large load at the position P2 with respect to the tensile force at the target position P0. The load device 22 may be composed of a rod and a cylinder extending along the rail 20.

The dancer roll 2 is connected to a displacement rod 60 that is displaced according to the positions P1 to P2 of the dancer roll 2. The displacement rod 60 is slidable on a rotating body 61 which is a detected part. The rotation angle of the rotating body 61 is detected by the detection unit 62, whereby the tension detecting device is arranged so that the position of the dancer roll 2 approaches the target position P0, that is, the tension acting on the web W is constant. Based on the output signal from 6, the drive device 31 (FIG. 1) of the drive roll 3 is feedback-controlled.

Next, the configuration of the control device shown in FIG. 3 will be described.
In FIG. 3, the web detecting device 5, the tension detecting device 6, the moving device 11, and the driving device 31 are connected to the conveyance control device 7. Signals from both the detection devices 5 and 6 are input to the transport control device 7, and the transport control device 7 outputs drive signals to the motor 15 and the drive device (motor) 31 of the moving device.

The conveyance control device 7 is connected to the processing control device 101 by wire or wireless via an interface. The processing control device 101 may control the processing device 100 and other devices for processing the web W derived from the dancer roll 2.

The housing 70 of the transfer control device 7 is provided separately from the housing 102 of the processing control device 101. Thereby, the conveyance apparatus of this web is unitized.

Next, an example of a method for controlling the conveyance path and tension of the web W will be described.
In FIG. 2, when the tension of the web W derived from the dancer roll 2 becomes larger than the target value, the dancer roll 2 is pulled by the web W and the dancer roll 2 is displaced from the target position P0 toward the position P2. In addition, the tensile force applied to the dancer roll 2 by the load device 22 increases.

Along with the displacement of the dancer roll 2, the rotating body 61 is slightly rotated through the displacement rod 60, and the rotation angle of the rotating body 61 is detected by the detection unit 62. When the rotation angle signal is output from the detection unit 62 to the conveyance control device 7 in FIG. 3, the conveyance control device 7 outputs a drive signal to the drive device 31, and the rotation speed of the drive roll 3 in FIG. 2 increases. Accordingly, the dancer roll 2 approaches the target position P0.

On the other hand, the tension of the web W led out from the guide bar 1 to the drive roll 3 in FIG. 1 increases, but at this time, the side edge We will be slightly displaced in the first flow direction D1. The displacement of the side edge We is detected by the web detection device 5, and a displacement signal is output to the conveyance control device 7 in FIG.

When the displacement signal is input, the transport control device 7 outputs a drive signal to the moving device 11 so that the guide bar 1 moves in the reverse direction D11. As a result, the guide bar 1 moves in the direction D11, the position of the side edge We is displaced in the direction D11, and the web W is transported along a predetermined transport path.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the guide bar 1 may be composed of a plurality of swinging guide bars.

Moreover, the dancer roll 2 may be provided with two or more instead of single (one).
Further, both ends of the guide bar 1, the dancer roll 2 and the drive roll 3 may be supported.

Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.

  The present invention can be applied to conveyance of a web such as a nonwoven fabric.

1: guide bar 10: guide mechanism 11: moving device 12: support end 13: slider 14: link 15: motor 16: arm 17: cantilever 100: processing device 101: processing control device 102: housing 2: dancer Roll 20: Rail 21: Slider 22: Load device 3: Drive roll 31: Drive device 4: Base 5: Web detection device 6: Tension detection device 60: Displacement rod 61: Rotating body 62: Detection unit 7: Conveyance control device 70 : Casing D1: first flow direction D2: second flow direction D11: reverse directions 1L, 2L, 3L: axis P0: target positions P1, P2: positions (positions) at both ends
W: Web We: Side edge

Claims (5)

A web transport device for transporting the web while controlling a web transport path and a tension acting on the web;
A guide bar that is moved so that a part of the web from the upstream to the downstream contacts and wraps around, and the downstream conveyance path of the web approaches a predetermined path;
A dancer roll which is arranged downstream of the guide bar and swings so as to be in a position corresponding to a flow direction tension acting on the web;
A drive roll disposed downstream of the guide bar and upstream of the dancer roll and driven while applying tension to the web so that the position of the dancer roll approaches a predetermined position;
The web is directly stretched between the guide bar and the drive roll without providing a roll for turning the flow direction of the web from the guide bar toward the drive roll ,
Here , the axes of the guide bar, the dancer roll, and the drive roll extend along planes parallel to each other,
The against the guide bar in a first plane passing through the web is directed to the drive roll, the axis of said dancer roll are disposed in parallel to each other,
In the plan view of the first plane, the dancer roll approaches the guide bar, and the upstream end position away from the drive roll and the downstream end position away from the guide bar and close to the drive roll. It arrange | positions between the said guide bar and the said drive roll so that it may reciprocate . The transport apparatus according to claim 1, wherein the first plane is a horizontal plane. 3. The conveying apparatus according to claim 1, wherein the guide bar changes the flow direction of the web, the first flow direction of the web introduced into the guide bar, and the second direction of the web derived from the guide bar. Extending in the direction crossing the flow direction,
Here, a guide mechanism for guiding the movement of the guide bar is further provided so that the guide bar moves in parallel with the first or second flow direction. 3. The conveying apparatus according to claim 1 or 2 , wherein the guide bar, dancer roll, and drive roll are held on one common base. In Claim 1 or 2 , the web detection device which detects whether the conveyance route of the web is a predetermined route,
A moving device for moving the guide bar;
A drive device for rotationally driving the drive roll;
A tension detector that detects the tension acting on the web by detecting the position of the dancer roll;
A transport control device that receives signals from both detection devices and outputs signals to the moving device and the driving device;
The case of the conveyance control device is provided separately from the case of the processing control device for processing the web derived from the dancer roll.

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