JP5999840B2 - Widening device for elastic stretch sheet - Google Patents

Description

  The present invention relates to a widening device for an elastic stretch sheet.

  2. Description of the Related Art Conventionally, a widening apparatus for an elastic stretch sheet that stretches in the width direction orthogonal to the transport direction while transporting the elastic stretch sheet is known (Patent Document 1). In the known apparatus, a pin member is disposed on the outer periphery of a pair of rotors whose rotation axes intersect, and pin-shaped needles are provided at both ends of the elastic elastic sheet in a region where the distance between the outer peripheral portions of the pair of rotors is narrow. The elastic stretchable sheet is inserted, receives the elastic stretchable sheet, and both rotors rotate approximately half, so that the elastic stretchable sheet is widened and passed to the next step.

JP04-218158 A

  The elastic stretchable sheet may be generated by cutting a continuous web supplied to an anvil roll provided upstream of a pair of rotors on the anvil roll. In this case, the anvil formed on the anvil roll and the needles of the widening device (a pair of rotors) are in a relationship that does not interfere in phase during operation.

  However, when the power source of the motor that rotates the rotor is turned off, the rotor can be freely rotated. Therefore, the needle and the anvil may interfere with each other and the needle may be damaged.

  Accordingly, an object of the present invention is to provide a widening device for an elastic stretchable sheet that does not cause a needle to be damaged when the power of a motor is inadvertently turned off.

The present invention is a widening device for an elastic stretchable sheet that stretches an elastic stretchable sheet that is stretchable in the width direction perpendicular to the conveying direction in the width direction,
A pair of rotors facing each other and spaced apart from each other at a passing position for passing the sheet downstream compared to a receiving position for receiving the sheet upstream;
A plurality of needles arranged on the outer periphery of the rotor to pierce the sheet and hold the sheet;
Regardless of the protrusion position at which the plurality of needles protrude from the outer periphery of the rotor and can be inserted into the sheet, and the phase of the rotor, the plurality of needles can be drawn from the outer periphery of the rotor and inserted into the sheet. First switching means for switching to a retractable position.

According to the present invention, the first switching means for switching the needle from the protruding position to the retracted position where the needle cannot be stuck regardless of the phase of the rotor is provided. Therefore, in the case where power is not supplied to the rotor motor, it is possible to prevent interference between the needle and the anvil by switching the needle to the retracted position.

FIG. 1 is a layout view of an apparatus for manufacturing a worn article to which an embodiment of a widening device for an elastic stretch sheet of the present invention is applied, and shows a case where one of pads is in a receiving position. FIG. 2A is a longitudinal sectional view taken along line IIA-IIA in FIG. 2B of the rotor when each needle is in the protruding position, and FIG. 2B is a front view of the rotor when each needle is in the protruding position. FIG. 3 is a cross-sectional view of the widening apparatus including a pair of rotors and a needle set at a protruding position. FIG. 4 is a layout diagram of the apparatus for manufacturing a worn article, and shows a case where one of the pads is in the hand-over position. 5A is a longitudinal cross-sectional view of the rotor taken along line VA-VA in FIG. 5B, and FIG. 5B is a front view of the rotor, showing the needle set in a holding state and a released state, respectively. FIG. 6 is a longitudinal sectional view showing a view in which the needle at the protruding position is in the released state at the hand-over position. FIG. 7A is a longitudinal sectional view taken along the line VIIA-VIIA of FIG. 7B showing the case where the needle is in the retracted position, and FIG. 7B is a front view showing the case where the needle is in the retracted position.

Preferably, a motor that rotationally drives the rotor;
The apparatus further includes control means for controlling the first switching means so that all of the plurality of needles are in the retracted position when the motor is powered off.

  In this case, all the needles are in the retracted position when the motor is turned off. Therefore, the needle can be prevented from interfering with the anvil and being damaged.

More preferably, each rotor has a plurality of pads,
A plurality of the needles are inserted into each pad,
The first switching means switches between the protruding position and the retracted position by moving the needle in the normal direction without moving the pads in the normal direction of the rotor.

  In this case, even if the needle is displaced from the protruding position to the retracted position, there is no need to move the pad.

  Preferably, the plurality of needles in the sheet receiving position are set in a holding state protruding from the outer periphery of the rotor and stuck in the sheet, and the plurality of needles in the sheet passing position are drawn from the outer periphery of the rotor. And a second switching means for setting to a released state not stuck in the sheet.

  In this case, the needle in the holding state at the receiving position receives the sheet, is conveyed to the transfer position, and the needle in the released state releases the sheet.

The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the manufacturing apparatus includes a conveyor 5 (an example of a conveyance device), a cutter 1, an anvil roll 2, a widening device 3, and a conveyance roller 4 (an example of another conveyance device).

The conveyor 5 conveys the continuous sheet S at a speed V <b> 1 while adsorbing a part of the continuous sheet S continuous in the conveyance direction Y by the adsorption unit 50. In place of the conveyor 5, an unwinding roller having a drive motor for unwinding the original roll of the continuous sheet S at a constant speed may be employed.
The continuous sheet S can be expanded and contracted in the width direction X orthogonal to the transport direction Y, and becomes, for example, a waist elastic body that expands and contracts in the waistline direction of the diaper.

  The anvil roll 2 rotates at a speed V2 larger than the speed V1 of the conveyor 5, and adsorbs the leading end portion of the continuous sheet S with the peripheral surface 2f, and the leading end of the continuous sheet S with respect to the peripheral surface 2f. The continuous sheet S is conveyed at the speed V1 of the conveyor 5 while slipping the part. The tip portion constitutes an elastic stretchable sheet S1 (hereinafter simply referred to as a sheet piece S1) that is widened in the width direction X later.

The cutter 1 cuts the leading end portions introduced on the anvil roll 2 of the continuous sheet S continuous in the conveying direction Y one after another at a predetermined interval in the conveying direction Y, and a plurality of waist elastic bodies (of the sheet pieces S1). Example) one after another.
The anvil roll 2 is provided with a plurality of hard anvils 2a with which the blades of the cutter 1 abut.

  The anvil roll 2 separates the sheet piece S1 from the continuous sheet S by conveying the sheet piece S1 generated by cutting the leading end of the continuous sheet S along the peripheral surface 2f.

That is, when the leading edge is released by cutting from the continuous sheet S conveyed at the speed V1 of the conveyor 5 on the anvil roll 2, each sheet piece S1 (cut leading edge) is faster than the speed V1 of the conveyor 5. The large anvil roll 2 is transported at the speed V2, and the distance from the leading end before the subsequent cutting is increased.

  The widening device 3 receives the sheet piece S1 from the anvil roll 2 to the pad 33 at a receiving position R1 where the peripheral surface 2f of the anvil roll 2 contacts the pad 33 of the widening device 3 via the sheet piece S1. Thereafter, at the transfer position R2 where the pad 33 is in contact with the conveying roller 4 via the sheet piece S1, the sheet piece S1 is disposed on the absorbent main body 20 of the wearing article conveyed by the conveying roller 4 (an example of a conveying device). . The main body 20 has a longitudinal direction along the transport direction Y and is continuous with the transport direction Y. The transport roller 4 may be a transport conveyor.

Next, the widening device 3 will be described.
As shown in FIG. 3, the widening device 3 includes a pair of rotors 30 and a servo motor 31 that rotationally drives each rotor 30.

The said widening apparatus 3 is a right-and-left symmetrical structure, and demonstrates one rotor 30 and the servomotor 31 below.

The pair of rotors 30 and 30 face each other obliquely, and the delivery position R2 for delivering the sheet piece S1 is separated from the receiving position R1 for receiving the sheet piece S1 upstream. That is, the pair of drive shafts 32 and 32 for rotating the pair of rotors 30 and 30 are disposed obliquely so that the axes 32c and 32c intersect each other. In other words, the pair of rotors 30 and 30 are arranged so that the distance along the width direction X increases as they go from the receiving position R1 to the transfer position R2.
Note that the inclination of the pair of rotors is exaggerated for easy understanding.

2A and 2B, the rotor 30 includes a rotor body 35 that is continuously rotated by a servo motor 31 via a drive shaft 32, a plurality of pads 33, and first and second switching means 6 and 7. Is provided. The pad 33 may be formed with a plurality of suction holes 34 for adsorbing the sheet piece S1 with negative air pressure.

As shown in FIGS. 2A and 2B, a plurality of needles N are inserted through the pads 33. These needles N are arranged on the outer periphery of the rotor 30 as shown in FIG. 1 and pierce the sheet piece S1 at the receiving position R1 to hold the sheet piece S1.

In order to prevent the needle N from being damaged when the needle N of FIG. 1 is pierced at both ends in the width direction X of the sheet piece S1, the flexible portion is provided in the recess where the needle N can be received at both ends in the axial direction of the anvil roll 2. (For example, sponge rubber) 2b is provided. 1 and 4, the flexible portion 2b is provided with a halftone dot.

As shown in FIGS. 2A and 2B, the first switching means 6 has a protruding position P1 in which the plurality of needles N protrude from the outer periphery of the pad 33 and can pierce the sheet S1, and FIGS. 7A and 7B. Thus, regardless of the phase of the rotor 30, the plurality of needles N are switched from the outer periphery of the pad 33 to the retracted position P2 where the sheet piece S1 cannot be inserted.

The first switching means 6 includes an air cylinder device 61 attached to the slider 60 slidable on the rotor body 35 and a bracket 62 attached to the tip of the air cylinder device 61. The plurality of needles N are attached to the bracket 62. The first switching means 6 moves the needle N in the normal direction Z without moving the pads 33 in the normal direction Z of the rotor 30 to move the protrusion position P1 and the retracted position. Switch to P2.

The control device 39 in FIG. 2A receives an OFF signal when at least one of the two servo motors 31 and 31 is turned off, and the control device 39 operates a solenoid valve (not shown) to air-operate as shown in FIG. 7A. The rod of the cylinder device 61 is contracted. As a result, the plurality of needles N of the pad 33 in FIG. 2A retracts from the protruding position P1 to the retracted position P2 in FIG. 7A.

On the other hand, when both the pair of servo motors 31 and 31 are turned on, an ON signal is input to the control device 39 of FIG. 7A, and the control device 39 operates a solenoid valve (not shown) or the like, as shown in FIG. 2A. The rod of the air cylinder device 61 is extended. As a result, the plurality of needles N of the pad 33 in FIG. 7A return from the retracted position P2 to the protruding position P1 in FIG. 2A.

The second switching means 7 in FIG. 2B has a known cam groove 70 and a cam follower 71 and the slider 60. As shown in FIG. 2A, the cam follower 71 is attached to the slider 60. Accordingly, the cam follower 71 moves along the cam groove 70 while the rotor 30 makes one rotation, and the slider 60 slides in the radial direction of the rotor 30 accordingly.

That is, the plurality of needles N at the receiving position R1 of the sheet piece S1 are set in a holding state protruding from the outer periphery of the pad 33 and stuck in the sheet piece S1, while the plurality of the plurality of needles N at the passing position R2 of the sheet piece S1. The needle N is pulled from the outer periphery of the pad 33 and is set in a released state where it is not stuck in the sheet piece S1.

Next, the operation of the widening device 3 will be described.
First, a normal driving operation will be described. In this case, the power supply of the servo motor 31 in FIG. 3 is ON, and therefore all the needles N are set at the protruding position P1.
3 and 6, illustration of the control device 36 is omitted.

The continuous sheet S is conveyed at the speed V <b> 1 of the conveyor 5 while the part of the continuous sheet S continuous in the conveying direction Y of FIG. 1 is adsorbed by the adsorption unit 50, and the continuous sheet S is supplied to the anvil roll 2.
On the other hand, while adsorbing the leading end portion of the continuous sheet S with the peripheral surface 2f of the anvil roll 2 rotating at a speed V2 larger than the speed V1, the continuous sheet S of the continuous sheet S is attracted to the peripheral surface 2f of the anvil roll 2. The continuous sheet S is conveyed at the speed V <b> 1 of the conveyor 5 while slipping the leading end.

When the leading edge is conveyed while slipping a predetermined amount on the anvil roll 2, the cutter 1 cuts the leading edge of the continuous sheet S on the anvil roll 2. The cut sheet piece S1 is conveyed to the receiving position R1 at a speed V2 higher than the speed V1 of the conveyor 5 while being sucked and held by the anvil roll 2.

In the receiving position R1, the pair of pads 33, 33 (FIG. 3) of the widening device 3 receives the sheet piece S1 from the anvil roll 2. That is, the needle N that protrudes in the radial direction of the roller 30 from the pads 33 and 33 in FIG. 3 (set to the protruding position P1) is stuck into the sheet piece S1 and is held, and a negative pressure source (not shown) The negative pressure of air is applied from the suction holes 34 of the pads 33 and 33 to receive and hold the sheet piece S1 across the pads 33 and 33.
Note that the negative pressure on the anvil side in FIG. 1 is released or switched to positive pressure at the receiving position R1.

The pads 33, 33 that have received the sheet piece S1 are separated from each other in the width direction X as shown in FIG. 6 as the rotor 30 rotates from the receiving position R1 in FIG. 1 to the transfer position R2 in FIG. As a result, the sheet piece S1 is expanded (widened) in the width direction X.

On the other hand, as shown in FIGS. 5A and 5B, the needle N retracts in the radial direction of the rotor 30 as the pad 33 approaches the transfer position R2, and in the transfer position R2, the needle N is radially inward of the outer peripheral surface of the pad 33. The needle N is retracted to the released state. In the transfer position R2, the negative pressure of the suction hole 34 of the pad 33 is released or set to a positive pressure.

Thereby, the sheet piece S1 in the widened state in FIG. 6 is arranged on the absorbent main body 20 on the conveying roller 4 at the transfer position R2 in FIG.
The conveying roller 4 may be provided with a suction device for maintaining the state of the widened sheet piece S1.

Next, a case where power supply to the servo motor 31 in FIG. 2A is stopped, such as when the power switch is set to OFF, will be described.

In this case, as shown in FIGS. 7A and 7B, the tip of the needle N is retracted from the outer surface of the pad 33 regardless of the phase of the rotor 30. That is, when the power switch of the servo motor 31 is turned off, the control device 39 operates a solenoid valve (not shown) so that the rods of all the air cylinder devices 61 are contracted, whereby all the needles N are in phase with the rotor 30. Regardless of the phase of the pad 33, the position is switched to the retracted position P2 retracted from the outer surface of the pad 33.
As shown in FIGS. 7A and 7B, at the transfer position R2 (FIG. 1), the needle N retracted inward in the radial direction of the rotor 30 by the cam mechanism retracts further inward due to contraction of the rod of the air cylinder device 61. .

Therefore, even if the servo motor 31 is turned off and each rotor 30 rotates freely, the needle N is not likely to be damaged by the anvil 2a in FIG.

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, it may be a continuous sheet that widens the sheet.
Further, the second switching means may be provided with another control means instead of the cam mechanism to control the needle protrusion and retraction according to the phase of the rotor.
Moreover, the main-body part to which a sheet piece is affixed may be mutually connected, and may be cut for every product.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.

INDUSTRIAL APPLICABILITY The present invention can be used for the manufacturing method and manufacturing of disposable wearing articles.

1: Cutter
2: Anvil roll 2a: Anvil 2b: Flexible part 2f: Peripheral surface 20: Absorbent body part
3: Widening device 30: Rotor 31: Servo motor 32: Drive shaft 33: Pad 34: Suction hole 35: Rotor body 39: Control device 4: Conveying roller 5: Conveyor 50: Suction unit 6: First switching means 60: Slider 61: Air cylinder device 62: Bracket 7: Second switching means 70: Cam groove 71: Cam follower V1: Conveyor speed V2: Anvil roll speed
N: Needle P1: Projection position P2: Retraction position R1: Receiving position R2: Handing position S: Continuous sheet S1: Elastic stretchable sheet (sheet piece) tip X: Width direction Y: Conveyance direction Z: Normal direction

Claims (3)

A widening device for an elastic stretch sheet that stretches an elastic stretch sheet that is stretchable in the width direction perpendicular to the transport direction, in the width direction,
A pair of rotors facing each other and spaced apart from each other at a passing position for passing the sheet downstream compared to a receiving position for receiving the sheet upstream;
A plurality of needles arranged on the outer periphery of the rotor to pierce the sheet and hold the sheet;
Regardless of the protrusion position at which the plurality of needles protrude from the outer periphery of the rotor and can be inserted into the sheet, and the phase of the rotor, the plurality of needles can be drawn from the outer periphery of the rotor and inserted into the sheet. First switching means for switching to a retractable position ;
A motor for rotating the rotor;
And a control means for the power supply of the motor for controlling the first switching means so that all the turned OFF of the plurality of needles is the retracted position. The widening device of claim 1 ,
Each of the rotors has a plurality of pads,
A plurality of the needles are inserted into each pad,
The first switching means switches between the protruding position and the retracted position by moving the needle in the normal direction without moving the pads in the normal direction of the rotor. The widening device according to claim 1 or 2,
The plurality of needles at the receiving position of the sheet are set in a holding state protruding from the outer periphery of the rotor and stuck in the sheet, and the plurality of needles at the sheet transfer position are drawn from the outer periphery of the rotor It further includes a second switching means for setting to a release state where it is not stuck.

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