JP6131044B2 - Stretchable sheet manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention provides a stretchable sheet manufacturing apparatus in which individual thread-like elastic members in an extended state are interposed between a pair of continuous sheets and are joined along a crossing direction intersecting the continuous direction of the continuous sheet, And a manufacturing method.

  Conventionally, an elastic sheet has been used as a functional part of an absorbent article such as a disposable diaper. As shown in the schematic perspective view of FIG. 1A, in the manufacturing process, the stretchable sheet is generated in the form of a continuous sheet 10 as an intermediate part. Further, the stretchable sheet 10 is, for example, a CD in a direction in which the individual thread-like elastic members 13, 13... Stretched between the pair of continuous sheets 11, 12 intersect the continuous direction of the continuous sheets 11, 12. It is the aspect which was interposed and joined in the state along the direction.

  The stretchable sheet 10 manufacturing apparatus 120 includes a pair of upper and lower rolls 21u that are driven and rotated while the corresponding continuous sheets 11 and 12 of the pair of continuous sheets 11 and 12 are wound around the outer peripheral surfaces 21ua and 21da, respectively. 21d and the pair of continuous sheets 11 and 12 which are overlapped and joined by a pair of upper and lower rolls 21u and 21d, the continuous body 13a of the thread-like elastic member is conveyed forward in the front-rear direction as the conveying direction. And a winding mechanism 141 for winding the continuous body 13a of the thread-like elastic member around the transport mechanism 131 while feeding the continuous body 13a of the thread-like elastic member.

  The conveyance mechanism 131 includes a pair of belt-shaped conveyance units 132 and 132 provided at respective positions closer to the end side in the CD direction than the continuous sheets 11 and 12 as main bodies. Then, the pair of belt-like conveyance sections 132 and 132 conveys the continuous body 13a of the thread-like elastic member wound around itself in a wound state with the longitudinal direction as the conveyance direction.

  Here, in this winding state, the continuous body 13a of the thread-like elastic member is stretched around the pair of belt-like conveyance units 132, 132 in the CD direction. That is, the continuous body 13a of the thread-like elastic member is provided on the upper portions of the pair of belt-like transport portions 132 and 132 from above, and on the lower portions of the pair of belt-like transport portions 132 and 132, respectively. The transfer portions 13ac extended from below are alternately provided in the transport direction.

  Further, the span portion 13ac immediately after the winding is inclined with respect to the CD direction. For this reason, while the transfer portion 13ac is being transferred toward the pair of rolls 21u and 21d, the belt-like transfer portions 132 and 132 are respectively configured to gradually correct this inclination and eliminate the inclination gradually. A pair of upper and lower endless belts 133u and 133d arranged side by side in the vertical direction is a main body. That is, by making a difference in the respective conveyance speed values between the pair of endless belts 133u, 133d, each spanning portion 13ac that is slanted with respect to the CD direction at the beginning of winding is positioned substantially parallel to the CD direction. It has corrected even to. And thereby, each spanning part 13ac which became substantially parallel to this CD direction is interposed between the continuous sheets 11 and 12, and is joined. Then, in order to change each spanning part 13ac of the continuous body 13a of the thread-like elastic member into individual thread-like elastic members 13, 13,... The continuous body 13a of the thread-like elastic member is cut by 181 and 181, and the above-described stretchable sheet 10 is generated in the form of a continuous sheet.

  Patent Document 1 discloses a configuration including a crank-shaped pipe arm member 146 as the winding mechanism 141. FIG. 1B shows a schematic perspective view of the arm member 146. The arm member 146 is a member obtained by bending a pipe into a crank shape. More specifically, the arm member 146 includes a first pipe part 146a provided along the conveying direction, which is the longitudinal axis of the pipe axis as much as possible as the rotation axis C146, and a radial direction from the front end of the first pipe part 146a. A second pipe portion 146b extending outward, and a third pipe portion 146c extending forward from the outer end of the second pipe portion 146b in parallel with the first pipe portion 146a. Yes. The first to third pipe portions 146a, 146b, and 146c communicate with each other on the inner circumferential space (hereinafter also referred to as an inner circumferential space), and the inner circumferential space is a thread-like elastic member. Is used for the travel route of the continuum 13a. That is, the continuous body 13a of the thread-like elastic member drawn out from the coil body 13C (the continuous body 13a of the thread-like elastic member is wound in a coil shape, for example, see FIG. 3) is the rear end of the first pipe portion 146a. The second pipe part 146b and the third pipe part 146c are sequentially passed through the inner peripheral side space from the first part to the inner peripheral side space. Then, by rotating the first pipe portion 146a as the rotation axis C146, the third pipe portion 146c circulates around the transport mechanism 131, whereby the continuous body 13a of the thread-like elastic member is transferred to the transport mechanism 131. It is designed to be wound.

JP2012-90836

  Such an arm member 146 winds the continuous body 13a of the thread-like elastic member around the transport mechanism 131 while rotating at a high speed of 600 to 3600 times per minute, for example. Therefore, it is very important that the rotation stability, that is, the dynamic balance is good. If the dynamic balance is bad, the continuous body 13a of the thread-like elastic member cannot be stably wound through the generation of vibration or the like. For example, due to the winding becoming unstable, the stretched state of the continuous body 13a of the thread-like elastic member may change unexpectedly, and eventually the stretchability of the stretchable sheet 10 may vary. .

  However, in the crank-shaped arm member 146 disclosed in Patent Document 1 described above, as shown in FIG. 1B, the center of gravity is greatly deviated from the rotation axis C 146. It is difficult to expect stability.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to stabilize the winding of the thread-like elastic member around the transport mechanism.

The main invention for achieving the above object is:
An apparatus for producing a stretchable sheet in which individual thread-like elastic members in an elongated state are interposed between a pair of continuous sheets and are joined in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
A joining mechanism for sandwiching and joining the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A transport mechanism that transports the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
A winding mechanism that winds the continuous body of the thread-like elastic member in an extended state around the transport mechanism while feeding out the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. A cutting mechanism,
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is small,
The winding mechanism has a cylindrical member as the one member,
The cylinder member rotates with the cylinder axis of the cylinder member as the rotation axis,
The elastic sheet manufacturing apparatus is characterized in that an end of the transport mechanism is inserted on the inner peripheral side of the cylindrical member .
Also,
This is a method for producing a stretchable sheet in which an individual thread-like elastic member in an extended state is interposed between a pair of continuous sheets in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
The joining mechanism is configured to sandwich and join the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A conveying mechanism that conveys the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
Winding the continuous body of the thread-like elastic member around the transport mechanism in an extended state while the winding mechanism unwinds the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. And having
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is small,
The winding mechanism has a cylindrical member as the one member,
The cylinder member rotates with the cylinder axis of the cylinder member as the rotation axis,
It is a manufacturing method of an elastic sheet , wherein the end of the conveyance mechanism is inserted in the inner circumference side of the cylinder member .
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, it is possible to stabilize the winding of the continuous body of the thread-like elastic member around the transport mechanism.

FIG. 1A is a schematic perspective view of a conventional manufacturing apparatus 120 for a stretchable sheet 10, and FIG. 1B is a schematic perspective view of a crank-shaped pipe arm member 146 used in the manufacturing apparatus 10. FIG. 2A is a schematic plan view of the stretchable sheet 10 manufactured by the manufacturing apparatus 20 of the first embodiment, and FIG. 2B is a view taken along the line BB in FIG. 2A. It is a schematic perspective view of the manufacturing apparatus 20 of the elastic sheet 10 of 1st Embodiment. 3 is a schematic central cross-sectional view of a winding part 46. FIG. 5A to 5C are schematic views of a drive mechanism that drives the pulleys 48p, 48p, 48p, and 48t. FIG. 6A is a schematic central cross-sectional view of the winding portion 46 ′ of the second embodiment, and FIG. 6B is a BB arrow view in FIG. 6A. It is a general | schematic center sectional drawing of the winding part 46 '' of the modification of 2nd Embodiment. 8A, 8B, and 8C are schematic perspective views of a configuration example in which a counter balance weight portion 146cbw is provided for the arm member 146 of the winding mechanism 141, respectively.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An apparatus for producing a stretchable sheet in which individual thread-like elastic members in an elongated state are interposed between a pair of continuous sheets and are joined in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
A joining mechanism for sandwiching and joining the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A transport mechanism that transports the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
A winding mechanism that winds the continuous body of the thread-like elastic member in an extended state around the transport mechanism while feeding out the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. A cutting mechanism,
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is an apparatus for producing a stretchable sheet, characterized in that is small.

  According to such a stretchable sheet manufacturing apparatus, the rotating member is integrally provided with the counter balance weight portion, and the rotating member and the counter balance weight portion are used as one member. The deviation amount of the center of gravity position of the member from the rotation axis is smaller than the center of gravity position of the rotating member itself. Therefore, the rotation of the rotating member around the rotation axis can be stabilized, and as a result, the continuous body of the thread-like elastic member can be stably wound around the transport mechanism.

An apparatus for producing such an elastic sheet,
The winding mechanism has a cylindrical member as the one member,
The cylinder member rotates with the cylinder axis of the cylinder member as the rotation axis,
It is desirable that an end of the transport mechanism is inserted on the inner peripheral side of the cylindrical member.

According to such a stretchable sheet manufacturing apparatus, the winding mechanism has a cylindrical member as one member when the rotating member and the counterbalance weight part are used as one member. And this cylinder member rotates by using its own cylinder axis as a rotation axis. Therefore, the deviation | shift amount from the rotating shaft of the gravity center position of a cylinder member is small, and, thereby, the said cylinder member can rotate with a favorable dynamic balance. As a result, the winding of the continuous body of the thread-like elastic member around the transport mechanism can be greatly stabilized.
Moreover, since it is a cylinder member, the wind noise which may be generated with rotation is also effectively reduced, and as a result, the manufacturing apparatus is free from noise problems.

An apparatus for producing such an elastic sheet,
On the outer peripheral surface of the cylindrical member, a groove is formed along a part of the travel route of the continuous body of the thread-like elastic member,
It is preferable that a continuous body of the traveling elastic thread member is passed through the groove.

According to such a stretchable sheet manufacturing apparatus, since the groove is formed on the outer peripheral surface, it is exposed to the outside. Therefore, the state of the continuous body of the thread-like elastic member in the groove can be easily seen from the outside. As a result, it is possible to detect in advance various unexpected troubles that may occur in the continuous body of the thread-like elastic member, for example, a situation in which traveling is hindered due to, for example, clogging of foreign matter in the groove. Can prevent troubles.
Moreover, since it is exposed to the outside, it is difficult for foreign matter to accumulate in the groove. That is, foreign matter such as dust or dust that can accumulate in the groove is quickly discharged to the outside of the groove by centrifugal force. Therefore, it is possible to maintain a state in which the running of the continuous body of the thread-like elastic member is not obstructed over a long period of time. Breakage of the continuum can be prevented in advance.
Furthermore, the continuous body of the thread-like elastic member is passed through the groove. That is, it is accommodated in the groove. Therefore, it is possible to effectively prevent wind pressure from acting on the continuous body of the thread-like elastic member with the rotation of the cylindrical member, and as a result, to effectively prevent the running of the continuous body of the thread-like elastic member from becoming unstable. it can.

An apparatus for producing such an elastic sheet,
It is desirable that the cylinder wall of the cylinder member has a hollow structure.

  According to such a stretchable sheet manufacturing apparatus, since the cylindrical wall of the cylindrical member has a hollow structure, the moment of inertia of the cylindrical member is reduced. Therefore, even when the position of the center of gravity of the cylindrical member is deviated from the rotation axis, it is possible to effectively suppress an adverse effect on the rotation, for example, generation of vibrations. It becomes possible to more stably wind the continuous body of the thread-like elastic member around the mechanism.

An apparatus for producing such an elastic sheet,
The rotating member has a plurality of pulleys that define a traveling route of a continuous body of the thread-like elastic member in the rotating member;
The continuous body of the thread-like elastic member supplied to the rotating member is preferably sent around the pulley and sent to the input portion.

  According to such a stretchable sheet manufacturing apparatus, when traveling in the rotating member, the continuous body of the thread-like elastic member is guided by the pulley, thereby enabling smooth travel. Therefore, it is possible to effectively prevent the continuous body of the thread-like elastic member from being obstructed by the continuous body of the thread-like elastic member being caught by the rotating member. As a result, it is possible to suppress unintentional fluctuations in the extended state of the continuous body of the thread-like elastic member.

An apparatus for producing such an elastic sheet,
The pulley is preferably driven to rotate.

  According to such a stretchable sheet manufacturing apparatus, since the pulley is driven and rotated, the continuous body of the thread-like elastic member is guided to the pulley in a state in which its running is not hindered. Therefore, traveling can be guided more smoothly by the pulley, and the traveling state can be further stabilized.

An apparatus for producing such an elastic sheet,
In the rotating member, it is preferable that a dummy pulley on which the continuous body of the thread-like elastic member is not hung is provided at a position symmetrical with respect to the position of the pulley and the rotation axis.

  According to such a stretchable sheet manufacturing apparatus, it is possible to effectively prevent the deterioration of the dynamic balance of the rotating member that may occur with the installation of the pulley by the installation of the dummy pulley.

An apparatus for producing such an elastic sheet,
In the cylindrical member, it is preferable that a dummy groove portion through which the continuous body of the thread-like elastic member is not passed is formed at a position symmetrical with respect to the position of the groove portion and the rotation axis.

  According to such a stretchable sheet manufacturing apparatus, it is possible to effectively prevent the deterioration of the dynamic balance of the cylindrical member that may occur with the formation of the groove portion by forming the dummy groove portion.

An apparatus for producing such an elastic sheet,
The rotating member is preferably made of aluminum.

  According to such a stretchable sheet manufacturing apparatus, since the rotating member is made of lightweight aluminum, the moment of inertia can be reduced. Therefore, even when the position of the center of gravity of the rotating member is deviated from the rotation axis, it is possible to effectively suppress adverse effects on the rotation, for example, unstable rotation. As a result, the input portion of the rotating member can stably wind the continuous body of the thread-like elastic member around the transport mechanism.

Also,
This is a method for producing a stretchable sheet in which an individual thread-like elastic member in an extended state is interposed between a pair of continuous sheets in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
The joining mechanism is configured to sandwich and join the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A conveying mechanism that conveys the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
Winding the continuous body of the thread-like elastic member around the transport mechanism in an extended state while the winding mechanism unwinds the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. And having
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is a method for producing a stretchable sheet, characterized in that it is small.

  According to such a method for producing an elastic sheet, the rotating member is integrally provided with the counterbalance weight part, and the one member when the rotating member and the counterbalance weight part are formed as one member. The deviation amount of the center of gravity position from the rotation axis is smaller than the center of gravity position of the rotating member. Therefore, the rotation of the rotating member around the rotation axis can be stabilized, and as a result, the continuous body of the thread-like elastic member can be stably wound around the transport mechanism.

=== First Embodiment ===
FIG. 2A is a schematic plan view of the stretchable sheet 10 manufactured by the manufacturing apparatus 20 of the first embodiment. Moreover, FIG. 2B is a BB arrow line view in FIG. 2A.
The stretchable sheet 10 is a continuous sheet 10 that is continuous in a continuous direction, and is used as a part of a disposable diaper, for example. That is, the stretchable sheet 10 is an intermediate product before becoming a final product. And this elastic sheet 10 is used as a functional component which provides elasticity to a side flap, a waist part, etc. of a diaper, for example.

  The stretchable sheet 10 includes a pair of continuous sheets 11 and 12 that are overlapped and joined in the thickness direction, and a plurality of thread-like elastic members 13 that are interposed between the pair of continuous sheets 11 and 12. 13 and so on. A plurality of thread-like elastic members 13 are arranged at intervals in the continuous direction along the width direction perpendicular to the continuous direction of the continuous sheets 11 and 12. Each thread-like elastic member 13 is joined to at least one continuous sheet 11 (12) in an expanded state. Therefore, the stretchable sheet 10 is given stretchability in the width direction by the thread-like elastic members 13, 13. That is, if each thread-like elastic member 13, 13... Shrinks, the continuous sheets 11 and 12 also shrink in the width direction and become a plurality of wrinkles. However, the shrinkage force of the thread-like elastic members 13, 13. If the continuous sheets 11 and 12 are pulled against each other, the wrinkles are extended and the continuous sheets 11 and 12 are expanded.

  In the example of FIG. 2A, the thread-like elastic members 13, 13,... Are arranged in the continuous direction with a constant arrangement pitch P0 with respect to the continuous sheets 11, 12, but the arrangement pitch P0 is limited to such an equal pitch. It is not a thing. For example, the arrangement pitch P0 may change periodically.

  In the example of FIG. 2A, the end 13e of the thread-like elastic member 13 protrudes from the respective edges 11e and 12e in the width direction of the continuous sheets 11 and 12, but in some cases, as shown in FIG. 11 and 12 may not protrude from the edges 11e and 12e in the width direction. That is, depending on the contraction force of the thread-like elastic member 13 after the continuous body 13a of the thread-like elastic member is cut in the manufacturing apparatus 20 to be described later and the application range of the adhesive, the edges 11e, 12e of the continuous sheets 11, 12 It is also possible that the sheet shrinks to the inside and completely fits in the continuous sheets 11 and 12, and in this case, the elastic sheet 10 looks beautiful.

  The thread-like elastic member 13 is, for example, a plurality of elastic filaments joined together to form a bundle, and the elastic filament is, for example, a synthetic resin fiber such as polyurethane fiber or PTT fiber. A specific example of the thread-like elastic member 13 is “Lycra (trademark) DuPont”. Further, the diameter of the thread-like elastic member 13 is, for example, 0.2 mm to 0.5 mm in a natural length state that is a non-extended state, and 0.1 mm to 0.00 mm in a state that is extended up to three times the natural length. 3 mm.

  On the other hand, the pair of continuous sheets 11 and 12 are continuous sheets having substantially the same width in the width direction, and are made of a nonwoven fabric, a woven fabric, a film, or the like. Then, both the pair of continuous sheets 11 and 12 may be made of the same material, or may be made of different materials depending on the case. In addition, about the material types, such as a nonwoven fabric, a woven fabric, and a film, the existing thing can be used suitably. For example, for non-woven fabrics and woven fabrics, single fibers made of thermoplastic resins such as polyethylene or polyethylene terephthalate, composite fibers with a sheath core structure, or combinations thereof can be used, and films can be used. Even if it exists, the thing made from the thermoplastic resin illustrated above etc. can be used.

  Further, an adhesive is interposed between the pair of continuous sheets 11, 12, and at least one of the pair of continuous sheets 11, 12 and the pair of continuous sheets 11, 12 is continuous by this adhesive. The sheet 11 (12) and the respective thread-like elastic members 13, 13... Are joined and integrated. As such an adhesive, for example, a hot melt adhesive can be used. Moreover, as an application pattern of the adhesive to the surface of the continuous sheet 11 (12), a stripe pattern in which a plurality of band-shaped application regions along the continuous direction are arranged in a discrete manner in the width direction may be used. It may be a spiral pattern in which a plurality of spiral application areas along the line are discretely arranged in the width direction, or may be a so-called solid application pattern in which an adhesive is applied without gaps over the entire predetermined area.

FIG. 3 is a schematic perspective view of the manufacturing apparatus 20 for the stretchable sheet 10.
As shown in FIG. 3, the manufacturing apparatus 20 includes a joining mechanism 21 that superposes and presses a pair of continuous sheets 11 and 12 in the thickness direction while transporting along a continuous direction, and a joining mechanism 21. A conveying mechanism 31 that conveys a continuous body 13a of a thread-like elastic member toward a pair of continuous sheets 11 and 12 that are overlapped in the thickness direction and pressed and joined, and a continuous body of a thread-like elastic member After the pair of continuous sheets 11 and 12 are pinched by the winding mechanism 41 and the joining mechanism 21 while the continuous body 13a of the thread-like elastic member is wound around the conveyance mechanism 31 while the feeding mechanism 31 is unwound, the thread-like elastic member Are cut at a position closer to the end side in the width direction than the continuous sheets 11 and 12 to generate individual thread-like elastic members 13, 13.

The transport mechanism 31 includes a pair of belt-shaped transport units 32 and 32 as main bodies, and each belt-shaped transport unit 32 is disposed at each position on the end side in the width direction from the continuous sheets 11 and 12, respectively. Each of the belt-like transport units 32 and 32 can transport the continuous body 13a of the thread-like elastic member along the longitudinal direction thereof, that is, transport the continuous body 13a of the thread-like elastic member with the longitudinal direction as the transport direction. To do.
Therefore, the continuous body 13a of the thread-like elastic member wound around the pair of belt-like transport portions 32 and 32 by the winding mechanism 41 is sequentially transported toward the joining mechanism 21 in this wound state. And in this winding state, the continuous body 13a of the thread-like elastic member is stretched across the pair of belt-like transport portions 32, 32 in the width direction. That is, the continuous body 13a of the thread-like elastic member includes an upper spanning portion 13ac (hereinafter also referred to as an upper spanning portion 13ac) that is spanned from above on each of the upper portions of the pair of belt-shaped transport portions 32 and 32, and A pair of belt-like conveyance sections 32, 32 has a crossover portion 13ac (hereinafter also referred to as a lower crossover portion 13ac) that is stretched from below to the lower portions of the belt-shaped conveyance sections 32, 32 alternately.

  Moreover, the span 13ac immediately after winding is in an inclined state with respect to the width direction. Therefore, in order to gradually correct this inclination and substantially eliminate this inclination while the transfer portion 13ac is being transferred toward the joining mechanism 21, the belt-like transfer portions 32 and 32 are each provided with a predetermined device. Is given. That is, each of the belt-like conveyance units 32 and 32 intersects with both the conveyance direction of the continuous body 13a of the thread-like elastic member and the width direction of the continuous sheets 11 and 12 (corresponding to the vertical direction in the example of FIG. 3). A pair of endless belts 33u and 33d arranged side by side as a main body, and by making a difference in each conveyance speed value between the pair of endless belts 33u and 33d, the winding is inclined with respect to the width direction at the beginning. Each spanned portion 13ac is corrected to a posture substantially parallel to the width direction. As a result, the spanning portions 13ac that are substantially parallel to the width direction are overlapped on the respective surfaces of the continuous sheets 11, 12 while being interposed between the continuous sheets 11, 12 by the joining mechanism 21. Combined, pinched and joined. Incidentally, the upper portions of the pair of belt-like conveyance portions 32, 32 correspond to the pair of upper endless belts 33u, 33u, respectively, and the lower portions of the pair of belt-like conveyance portions 32, 32 are also the lower portions of the pair. This corresponds to the endless belts 33d and 33d.

  And the continuous body 13a of the thread-like elastic member joined to the pair of continuous sheets 11 and 12 in this way is more end in the width direction than the continuous sheets 11 and 12 after the clamping force of the joining mechanism 21 related to the joining. Are cut by the cutting mechanisms 51, 51 at the respective positions on the side, whereby the spanning portions 13ac, 13ac... Of the continuous body 13a of the thread-like elastic members are changed to individual thread-like elastic members 13, 13,. . And the elastic sheet 10 is produced | generated by the above.

  Hereafter, each structure 21, 31, 41, 51 is demonstrated. In the following description, the continuous direction of the continuous sheets 11 and 12 is also referred to as “MD direction”, and the direction orthogonal to the MD direction, that is, the width direction of the continuous sheets 11 and 12 is referred to as “CD direction”. " The thickness direction of the continuous sheets 11 and 12 is orthogonal to both the continuous direction and the width direction.

  For convenience of explanation, three directions orthogonal to each other are defined as a vertical direction, a front-rear direction, and a left-right direction. In this example, the up-down direction is parallel to the vertical direction, and the front-rear direction and the left-right direction are parallel to the horizontal direction. The CD direction and the left-right direction are the same direction. Furthermore, the conveyance direction of the continuous body 13a of the filamentous elastic member by the conveyance mechanism 31 is parallel to the front-rear direction. Incidentally, the CD direction (left-right direction) corresponds to the “crossing direction” according to the claims, and the MD direction corresponds to the “continuous direction” according to the claims.

<<< joining mechanism 21 >>>
The joining mechanism 21 includes a pair of upper and lower rolls 21u and 21d that are driven and rotated about rotation axes C21u and C21d facing the CD direction. Then, one continuous sheet 11 of the pair of continuous sheets 11 and 12 is wound around the upper roll 21u as the first roll at a predetermined winding angle, and the lower roll 21d as the second roll is wound around the lower roll 21d. The other continuous sheet 12 is wound at a predetermined winding angle. Both of the continuous sheets 11 and 12 are held in a state in which there is almost no relative slip between the outer peripheral surfaces 21ua and 21da of the rolls 21u and 21d to be wound, thereby driving the rolls 21u and 21d. With the rotation, the continuous sheets 11 and 12 are transported along the rotation directions Dcu and Dcd of the rolls 21u and 21d substantially integrally with the outer peripheral surfaces 21ua and 21da of the corresponding rolls 21u and 21d.

  When the outer peripheral surfaces 21ua and 21da of the pair of rolls 21u and 21d pass through the closest position Pn (hereinafter also referred to as the nip position Pn), the upper continuous sheet 11 and the lower continuous sheet 12 are The two layers are overlapped in the thickness direction and sandwiched between the layers, and thereby, the two are joined together by an adhesive applied in advance to at least one of the surfaces to be overlapped. As described above, immediately before the joining, between the pair of continuous sheets 11 and 12, the extended portion 13ac of the continuous body 13a of the stretched yarn-like elastic member is in the CD direction (width direction). Since it is put in along, the three parts of the upper and lower continuous sheets 11 and 12 and the spanning portion 13ac of the continuous body 13a of the thread-like elastic member are joined and integrated at the time of joining.

  By the way, the drive rotation of the pair of rolls 21u, 21d is performed using, for example, a servo motor (not shown) as a drive source. The rotation speed of the servo motor is controlled by an appropriate control device (not shown). Under the control of the rotation speed, the production speed value (m / min) of other devices in the absorbent article production line. ) (For example, in proportion), the peripheral speed values (m / min) of the rolls 21u and 21d are changed. For example, if the speed of the other device increases, the peripheral speed value (m / min) of the rolls 21u and 21d is increased by an amount corresponding to the speed, and conversely, if the other device decelerates, the amount corresponding to that increases. The peripheral speed value (m / min) is decelerated. Thereby, the joining mechanism 21 can always supply the elastic sheet 10 at a supply speed value (m / min) required by another device.

<<< Conveyance mechanism 31 >>>
As shown in FIG. 3, the transport mechanism 31 has belt-shaped transport portions 32 and 32 on the left and right in the CD direction, respectively. Each belt-shaped transport unit 32 is disposed so as to straddle the joining mechanism 21 in the front-rear direction while the longitudinal direction thereof is directed in the front-rear direction, and thereby, the elastic thread is straddled across the joining mechanism 21 along the front-rear direction. A conveyance path for the continuous body 13a is formed.

  Each belt-like conveyance unit 32 has a pair of upper and lower endless belts 33u and 33d. Each endless belt 33u, 33d is wound around a pair of pulleys 34u, 34u, 34d, 34d disposed at both ends in the front-rear direction. At least one of the pulleys 34u and 34d is connected to servo motors 35u and 35d serving as drive sources, so that the rotational speed value can be set for each of the endless belts 33u and 33d.

Further, by setting the orientations of the pulleys 34u, 34u, 34d, and 34d, the endless tracks 33u and 33d are arranged so that the orbits of the endless belts 33u and 33d are located closer to the end side in the CD direction and in the CD direction than the end side track Tr1. The center side track Tr2 is located on the center side. In the end-side track Tr1, the endless belts 33u and 33d move forward in the front-rear direction, while in the center-side track Tr2, move backward, and are thus wound around the pair of belt-like conveyance units 32 and 32. The continuous body 13a of the filamentous elastic member is held by the endless belts 33u, 33d, 33u, and 33d that move on the end-side track Tr1, so that it is conveyed forward in the front-rear direction and finally reaches the joining mechanism 21. It has become.
Incidentally, the direction of the belt surfaces of the endless belts 33u and 33d is basically the direction in which the normal direction of the surfaces is parallel to the CD direction, but in some cases, for example, greater than 0 ° and less than 60 ° from the CD direction. It may be inclined in the angle range.

  The servo motors 35u and 35d for driving the endless belts 33u and 33d are controlled in rotation speed by an appropriate control device. Then, under this rotational speed control, the servomotors 35u, 35d allow the upper endless belt 33u to define the transport speed value (m / min) of the transport mechanism 31 and the lower endless belt 33d. The circumferential speed value (m / min) is changed in conjunction with (for example, in proportion to) the circumferential speed value (m / min) that is the rotational speed value (m / min) of the joining mechanism 21. Therefore, the peripheral speed values (m / min) of the rolls 21u and 21d of the joining mechanism 21 are changed to correspond to the change in the production speed value (m / min) of another apparatus in the absorbent article production line. Even in this case, the conveyance speed value (m / min) of the continuous body 13a of the thread-like elastic member is promptly changed to the speed value corresponding thereto.

<<< winding mechanism 41 >>>
As shown in FIG. 3, the winding mechanism 41 includes a thread-like elastic member from a coil body 13C of a thread-like elastic member (a continuous body 13a of the thread-like elastic member wound around a suitable winding member such as a bobbin in a coil shape). The continuous body 13a is wound around the rear end portion 31b of the transport mechanism 31 while being fed out. Therefore, the winding mechanism 41 includes a feeding part 43 that feeds the continuous body 13a of the thread-like elastic member from the coil body 13C of the thread-like elastic member that is rotatably supported by the reel mechanism 42, and a thread-like elasticity that is fed from the feeding part 43. And a winding portion 46 that winds the member continuous body 13 a around the rear end portion 31 b of the transport mechanism 31.

  The feeding portion 43 feeds the continuous body 13a of the thread-like elastic member from the coil body 13C attached to the reel mechanism 42 and sets the tension of the continuous body 13a within a predetermined tension range, and then the winding speed of the winding portion 46. In conjunction with the value (m / min), the continuous body 13a of the thread-like elastic member is supplied to the winding section 46 at a predetermined supply speed value (m / min) corresponding to the winding speed value.

  Here, the above-described tension range is determined in advance based on the minimum tension in a range in which the continuous body 13a of the thread-like elastic member does not loosen, and is, for example, 0.0298N to 0.098N. Thus, basically, the ratio of the winding speed value of the winding section 46 to the supply speed value of the feeding section 43 is the continuous body 13a of the thread-like elastic member at the time of winding around the transport mechanism 31. The expansion magnification is. Therefore, by adjusting the supply speed value in conjunction with the winding speed value, the continuous body 13a of the thread-like elastic member can be wound around the transport mechanism 31 almost always at the target extension magnification. Incidentally, the expansion ratio is an index indicating how many times the continuous body 13a of the thread-like elastic member is extended from its natural length. For example, the length LS in the extended state is divided by the natural length L0. The divided value (= LS / L0). Further, the winding speed value (m / min) is calculated by, for example, the upper spanning portion 13ac, the lower spanning portion 13ac in FIG. 3, and the pair of portions 13ad, 13ac, 13ac between the portions 13ac, 13ac. 13d (the added portion (m) of each length at the time of winding of the portions 13ad and 13ad that contact the endless belts 33u and 33d on the end-side track Tr1) is rotated once around the rotation axis C46a by the input portion 48t. It is possible to divide by the time (minutes) required for.

  As a specific configuration example of the feeding portion 43, an upstream position in the supply route of the continuous body 13a of the filamentous elastic member from the coil body 13C of the reel mechanism 42 to the winding portion 46, that is, close to the coil body 13C. And a supply roll 45 provided at a position downstream of the tension controller 44 in the supply route, that is, at a position close to the winding portion 46 in the supply route. Here, the tension controller 44 performs feedback control of the feed amount from the coil body 13C so that the tension of the continuous body 13a of the thread-like elastic member at the nearest downstream position falls within a predetermined tension range. As a configuration example, it has a sensor 44s for measuring the tension at the nearest downstream position, and a feeding drive pulley 44p provided at a position upstream of the travel route from the measurement position of the sensor 44s. . Then, a servo motor (not shown) as a drive source of the feeding drive pulley 44p is controlled by an appropriate control device so that the measured value of the tension output from the sensor 44s falls within the preset tension range. The

  FIG. 4 is a schematic central sectional view of the winding portion 46. As shown in FIG. 4, the winding portion 46 includes a bottomed cylindrical member 46 a (corresponding to a cylindrical member) disposed in the vicinity of the rear end portion 31 b of the transport mechanism 31 as a main body.

  The bottomed tubular member 46a has a tubular portion 46at and a bottom plate portion 46ab that closes the tubular end opening on the rear side of the tubular portion 46at. The cylindrical portion 46at is, for example, a cylindrical body having a cylindrical wall thickness t that is constant over the entire circumference, and a circular cross-sectional shape of the outer peripheral surface 46ata of the cylindrical wall, on the inner peripheral side of the cylindrical portion 46at. The cylinder shaft C46a that is virtually positioned is supported by an appropriate bearing member Brg so as to be rotatable about the rotation axis C46a. The cylinder axis C46a is set at substantially the same position as the center position of the cross-section defined by both the vertical direction and the CD direction while being parallel to the front-rear direction. Yes. Therefore, a later-described input portion 48t provided on the bottomed tubular member 46a can be made to circulate around the transport mechanism 31, and thereby the continuous body 13a of the thread-like elastic member is wound around the transport mechanism 31. Can do.

  Here, the cylindrical axis C46a is an axis that connects the cross-sectional center C46at of the cylindrical portion 46at over the entire length of the cylindrical portion 46at, but in this example, the cross-section of the outer peripheral surface 46ata of the cylindrical portion 46at as described above. Since the shape is a perfect circle, the cross-sectional center C46at is a so-called circle center, and therefore the cylinder axis C46a is an axis that connects the circle centers over the entire length of the cylinder portion 46at.

  Therefore, the amount of deviation of the center of gravity of the bottomed cylindrical member 46a from the rotation axis C46a is very small. Therefore, during rotation, the bottomed cylindrical member 46a can rotate with a very good dynamic balance, As a result, it is possible to stably rotate around the rotation axis C46a, such as suppressing vibration during rotation to an extremely low level. As a result, the continuous body 13a of the thread-like elastic member can be wound around the transport mechanism 31 at a target expansion ratio. Moreover, since it is the bottomed cylindrical member 46a, the wind noise during rotation is greatly reduced, and it is also freed from noise problems.

  Desirably, the cylindrical wall of the cylindrical portion 46at of the bottomed cylindrical member 46a may have a hollow structure. Then, the moment of inertia of the bottomed tubular member 46a is reduced. Thus, even if the center of gravity of the bottomed cylindrical member 46a is deviated from the rotation axis C46a, it is possible to effectively suppress adverse effects on the rotation, such as the occurrence of vibrations, etc. The insertion portion 48t attached to the bottomed tubular member 46a can stably wind the continuous body 13a of the thread-like elastic member around the transport mechanism 31. Incidentally, the reduction of the moment of inertia of the bottomed cylindrical member 46a is not limited to the above, and can be realized by another method. For example, the inertia moment can be reduced by making the bottom plate portion 46ab of the bottomed cylindrical member 46a hollow, and the inertia moment can be similarly reduced by making the bottomed cylindrical member 46a lightweight aluminum. Can be reduced.

  The bottomed cylindrical member 46a is rotated by an appropriate drive source. In this example, a servo motor 49m is used. That is, as shown in FIG. 4, from the bottom plate portion 46ab of the bottomed cylindrical member 46a, a small-diameter cylindrical body 47 is provided so as to protrude rearward and coaxially with the cylindrical axis C46a as the rotation axis C46a. A driving pulley 49p is coaxially fixed to the cylindrical body 47, and the driving rotation operation of the driving rotating shaft 49s of the servo motor 49m is input to the driving pulley 49p via the timing belt 49b. As a result, the bottomed tubular member 46a is driven to rotate. Incidentally, the small-diameter cylindrical body 47 is provided with the above-described bearing member Brg, that is, the bearing member Brg that rotatably supports the bottomed tubular member 46a.

On the other hand, a plurality of pulleys 48p, 48p, and 48p are provided at a plurality of positions in the bottomed cylindrical member 46a for the purpose of defining a travel route of the continuous body 13a of the thread-like elastic member in the bottomed cylindrical member 46a. ing. That is, a continuous body 13a of a thread-like elastic member is wound around each of the pulleys 48p, 48p, 48p. Each of the pulleys 48p, 48p, and 48p has a bottomed cylindrical member that is a continuous member 13a of a thread-like elastic member that is supplied from the feeding portion 43 to the rear end portion of the small-diameter cylindrical body 47 of the bottomed cylindrical member 46a. It guide | induces to the insertion part 48t to the conveyance mechanism 31 set to the front-end part 46af of 46a.
Specifically, each of the pulleys 48p, 48p, and 48p includes a front end position on the inner peripheral side of the small-diameter cylindrical body 47, a rear end position of the cylindrical portion 46at of the bottomed cylindrical member 46a, and a front end of the cylindrical portion 46at. In addition, a feeding pulley 48t is separately provided as the above-described feeding portion 48t at the front end position.
Then, the continuous body 13a of the thread-like elastic member supplied from the feeding portion 43 is wound around the pulleys 48p, 48p, 48p in the above order, so that the continuous body 13a of the thread-like elastic member is as follows. As a result, the charging unit 48t is reached. First, the continuous body 13a of the thread-like elastic member supplied from the feeding portion 43 reaches the front end position of the small-diameter cylindrical body 47 through the inner peripheral side of the small-diameter cylindrical body 47. Then, by the pulley 48p at that position, The traveling direction is changed outward in the radial direction of the bottomed cylindrical member 46a and travels along the bottom plate portion 46ab of the bottomed cylindrical member 46a. And this traveling leads to the rear end position of the cylindrical portion 46at of the bottomed cylindrical member 46a, but the traveling direction is again changed forward by the pulley 48p at the rear end position to the front end position of the cylindrical portion 46at. It reaches. And finally, it is guided by the pulley 48p at the front end position to the input portion 48t at the same position.

  Note that the input pulley 48t, which is the input portion 48t, has its own rotation axis C48t set in parallel with the cylinder axis C46a of the bottomed cylinder member 46a. Therefore, the pulley 48t can smoothly and promptly feed the continuous body 13a of the thread-like elastic member toward the rear end portion 31b of the transport mechanism 31 located on the inner peripheral side of the bottomed cylindrical member 46a.

  Further, with respect to the position in the front-rear direction, the front end portion 46 af of the bottomed cylindrical member 46 a overlaps the rear end portion 31 b of the transport mechanism 31. That is, the rear end portion 31b of the transport mechanism 31 is inserted from the front end portion 46af of the bottomed cylindrical member 46a to the inner peripheral side of the bottomed cylindrical member 46a. Therefore, the continuous body 13a of the thread-like elastic member thrown from the feeding portion 48t at the front end position to the rear end portion 31b of the transport mechanism 31 can be reliably wound around the outer periphery of the rear end portion 31b of the transport mechanism 31. .

  By the way, the rotation speed of the servo motor 49m for driving and rotating the winding portion 46 is controlled by an appropriate control device. Then, under the rotational speed control, the servo motor 49m links the winding speed value (m / min) of the winding section 46 with the transport speed value (m / min) of the transport mechanism 31 described above (for example, Change proportionally). Therefore, the peripheral speed values (m / min) of the rolls 21u and 21d of the joining mechanism 21 are changed to correspond to the change in the production speed value (m / min) of another apparatus in the absorbent article production line. Thus, even when the influence reaches the transport speed value of the transport mechanism 31, the arrangement pitch in the transport direction (front-rear direction) of the transfer portions 13ac, 13ac... On the transport mechanism 31 is always constant. Can be maintained. As a result, the arrangement pitch P0 of the respective thread-like elastic members 13, 13... On the continuous sheets 11, 12 can always be kept constant regardless of the production speed value of the other apparatus.

  The pulleys 48p, 48p, 48p and the insertion pulley 48t provided on the above-mentioned bottomed cylindrical member 46a are driven by the rotational force of the continuous member 13a by contact with the continuous member 13a of the thread-like elastic member. A pulley may be used, or a driving pulley that rotates by obtaining a rotational force from an appropriate drive source such as a servo motor (not shown) may be used. However, in the case of the former driven pulley, since the accompanying rotational force is taken from the continuous body 13a of the thread-like elastic member, the continuous body 13a of the thread-like elastic member has a slight restraining force that stops traveling. Will be added. As a result, an unplanned pulling force may randomly act on the continuum 13a, and the extension state of the continuum 13a may become unstable.

  Therefore, if possible, the pulleys 48p, 48p, 48p and the input pulley 48t may be driven pulleys as in the latter case. As an example of the drive source of these pulleys 48p, 48p, 48p, 48t, a servo motor can be cited. Here, each of the pulleys 48p, 48p, 48p, 48t may have a servo motor mounted on the bottomed cylindrical member 46a. However, depending on circumstances, all the pulleys 48p, 48p, 48p of the bottomed cylindrical member 46a may be used. , 48t may share one servo motor. That is, in the latter case, the pulleys 48p, 48p, 48p, and 48t are shared from a single servo motor by a winding transmission mechanism such as a pulley and a timing belt, or a gear train that meshes a plurality of gears. And configured to transmit the rotational force.

  In addition, the peripheral speed value (m / min) of each pulley 48p, 48p, 48p, 48t is, for example, the winding speed value (m / min) from the supply speed value (m / min) of the supply roll 45 of the feeding unit 43 described above. It may be set to an arbitrary value selected from the speed range up to (min). If it does so, the restraining force which each pulley 48p, 48p, 48p, 48t can exert on the continuous body 13a of a thread-like elastic member can be reduced effectively, and also it is the input part 48t of the bottomed cylindrical member 46a. It is also possible to effectively suppress the slack of the continuous body 13a of the thread-like elastic member on the travel route from the loading pulley 48t to the transport mechanism 31 and stably wind the same. In this case, the rotation speed of each servo motor may be controlled by an appropriate control device, and in this case, each pulley 48p, 48p, 48p, 48t is the traveling speed of the continuous body 13a of the thread-like elastic member. It is possible to drive and rotate in conjunction with the value.

  Incidentally, as an example of a power feeding mechanism for feeding power to the servo motor mounted on the bottomed cylindrical member 46a and rotating together, an electrode (not shown) provided on the outer peripheral surface 47a of the small-diameter cylindrical body 47 of the bottomed cylindrical member 46a. ), And a conductive brush member (not shown) supported by a stationary member in a slidable contact with the electrode, and an appropriate external power source (not shown) for supplying power to the brush member , And the like.

  However, depending on the surrounding environment, the brush member as described above may not be used. In such a case, the pulleys 48p, 48p, 48p, and 48t are moved using the following drive mechanism. It may be driven and rotated. 5A to 5C are schematic views of such a drive mechanism. In FIG. 5A, the pulleys 48p, 48p, 48p, and 48t are illustrated, and the driving pulleys 40p, 40p, 40p, 40t, 40p1, 40p2, and 40p3 of the drive mechanism are generally not illustrated, but FIG. In contrast, the pulleys 48p, 48p, 48p, and 48t are not shown, and the drive mechanism is illustrated. FIG. 5C shows a CC arrow view in FIG. 5B.

  As shown in FIGS. 5A and 5B, this drive mechanism generates the rotational motions of the pulleys 48p, 48p, 48p, and 48t from the rotational motion of the bottomed tubular member 46a. That is, the drive endless belt 40b of FIG. 5B is driven by being driven around the drive pulleys 40p, 40p, 40p, and 40t provided in parallel so as to correspond to the pulleys 48p, 48p, 48p, and 48t, respectively. It has become.

  More specifically, as shown in FIG. 5A and FIG. 5B, the driving mechanism corresponds to each pulley 48p, 48p, 48p, 48t, and each of the driving pulleys provided integrally and coaxially at adjacent positions. 40p, 40p, 40p, 40t, a first driving pulley 40p1 rotatably supported on the bottom plate portion 46ab of the bottomed tubular member 46a, and a second driving pulley 40p2 rotatably supported on the bottom plate portion 46ab. And a third driving pulley 40p3 that is rotatably supported by the cylindrical portion 46at of the bottomed cylindrical member 46a, a rotational axis C46a that is the cylindrical axis C46a and the central axis C40s of the bottomed cylindrical member 46a, and the bottom plate portion A fixed pulley 40s that is fixedly supported by an appropriate fixing system member (not shown) so as to be non-rotatable. 5B and 5C, the drive endless belt 40b includes the fixed pulley 40s → the first drive pulley 40p1 → the drive pulley 40p → the drive pulley 40p → the drive pulley 40p → the drive pulley. 40t → the third driving pulley 40p3 → the second driving pulley 40p2 is sequentially wound around in this order.

  Therefore, when the bottomed cylindrical member 46a rotates around the cylindrical axis C46a, the first driving pulley 40p1 and the second driving pulley 40p2 also revolve around the cylindrical axis C46a together with the bottomed cylindrical member 46a. Along with the revolution, the first and second drive pulleys 40p1 and 40p2 rotate around the rotation axes C40p1 and C40p2, respectively, by the change in the revolution position of the first and second drive pulleys 40p1 and 40p2. Due to the rotation, the driving endless belt 40b goes around. Then, the driving pulleys 40p, 40p, 40p, and 40t are also rotated by this rotation, and this rotation is transmitted to the pulleys 48p, 48p, 48p, and 48t that the driving pulleys 40p, 40p, 40p, and 40t are in charge of. Thus, each pulley 48p, 48p, 48p, 48t is driven to rotate.

<<< Cutting mechanism 51 >>>
As shown in FIG. 3, the cutting mechanisms 51, 51 are respectively disposed at positions closer to the end side in the CD direction than the transport mechanism 31 in correspondence with the belt-shaped transport units 32, 32. Is the main body. Each of the rotary blades 52 and 52 is driven and rotated around the center of the circle, and the edge of the outer peripheral edge of the rotary blade 52 from the end in the CD direction to the continuous body 13a of the thread-like elastic member at the position in charge thereof. By pressing, the continuous body 13a of the thread-like elastic member is cut at a position closer to the end side in the CD direction than the continuous sheets 11 and 12, and the individual thread-like elastic members 13, 13. . That is, the continuous portion 13ac of the continuous body 13a of the thread-like elastic member stretched in the CD direction between the pair of belt-like transport units 32, 32 arranged in the CD direction is connected to the continuous body 13a of the thread-like elastic member by cutting the rotary blade 52. As a result, the span portion 13ac is assembled to the continuous sheets 11 and 12 as individual thread-like elastic members 13.

  Incidentally, the cutting mechanism 51 is not limited to the rotary blade 52 described above. For example, instead of the rotary blade 52 described above, a fixed blade may be provided, or an ultrasonic cutter that cuts the cutting target while vibrating the blade edge with the generated ultrasonic vibration may be provided. A laser that burns off the object may be provided. Furthermore, it may be configured such that it can be sheared so as to be cut with a scissors, or may be configured so as to be cut with pinching.

=== Second Embodiment ===
FIG. 6A is a schematic central cross-sectional view of a winding portion 46 ′ of the second embodiment. Moreover, FIG. 6B is a BB arrow line view in FIG. 6A.
In the first embodiment described above, as shown in FIG. 4, the travel route of the continuous body 13a of the thread-like elastic member is set on the inner peripheral side of the bottomed cylindrical member 46a. However, the winding portion 46 ′ of the second embodiment is mainly different in that it is devised so that the running state of the continuous body 13a can be visually recognized from the outside of the bottomed tubular member 46a. To do. Therefore, since the contents other than this are generally the same as those in the first embodiment, the same reference numerals are given to the same components, and descriptions thereof are omitted.

As shown in FIGS. 6A and 6B, first, a groove 46m is formed on the outer peripheral surface 46ata of the cylindrical portion 46at of the bottomed cylindrical member 46a along a part of the traveling route of the continuous body 13a of the thread-like elastic member. A continuous body 13a of a thread-like elastic member is passed through the groove 46m. That is, since the traveling route on the outer peripheral surface 46ata is a route for sending the continuous body 13a of the thread-like elastic member from the rear to the front, the groove 46m is formed in a straight line along the front-rear direction corresponding to the route. ing.
Further, as shown in FIG. 6A, the bottom plate portion 46ab of the bottomed cylindrical member 46a has a slit portion 46sD for taking out the continuous body 13a of the thread-like elastic member from the inner peripheral side to the outer peripheral side of the bottomed cylindrical member 46a. It is formed along the rotational radius direction of the bottomed cylindrical member 46a. Thus, the continuous body 13a of the thread-like elastic member supplied from the feeding portion 43 through the inner peripheral side of the small diameter cylindrical body 47 to the inner peripheral side of the bottomed cylindrical member 46a is replaced with the outer peripheral surface of the bottomed cylindrical member 46a. It can be guided to the groove 46m of 46ata.

Here, the effect of the groove 46m will be described. First, since the groove part 46m is formed in the outer peripheral surface 46ata of the bottomed cylindrical member 46a, the space in the groove part 46m is exposed to the outside. Therefore, the state of the continuous body 13a of the thread-like elastic member that is passed through the space in the groove 46m can be easily seen from the outside. As a result, various unexpected troubles that can occur in the continuous body 13a of the thread-like elastic member, for example, a situation in which traveling is hindered due to clogging of foreign matter in the groove 46m, etc. can be detected in advance. As a result, the trouble can be prevented in advance.
In addition, since the space in the groove 46m is exposed to the outside, it is difficult for foreign matter to accumulate in the groove 46m. That is, foreign matter such as dust and dirt that can accumulate in the space in the groove 46m is quickly discharged to the outside of the groove 46m by centrifugal force. Therefore, it is possible to maintain a state in which the running of the continuous body 13a of the thread-like elastic member is not obstructed over a long period of time, and as a result, an unexpected change in the stretched state caused by the thread-like elastic member 13a being caught on the foreign matter, In addition, troubles such as breakage of the continuum 13a can be prevented in advance.
Further, the continuous body 13a of the thread-like elastic member is accommodated in the groove 46m. Therefore, it is possible to effectively prevent an excessive wind pressure from acting on the continuous body 13a of the thread-like elastic member as the bottomed cylindrical member 46a rotates, and as a result, the running of the continuous body 13a of the thread-like elastic member becomes unstable. This can be prevented.

  However, if the groove 46m is formed in the bottomed cylindrical member 46a or the pulleys 48p, 48p, 48p, 48t described above are provided, the dynamic balance of the bottomed cylindrical member 46a is deteriorated and the rotation around the cylinder axis C46a is unstable. There is a risk of becoming. Therefore, desirably, as shown in the schematic central cross-sectional view of FIG. 7, the continuous body 13a of the thread-like elastic member is located at a position that is line-symmetric with respect to the groove 46m and the cylinder axis C46a on the outer peripheral surface 46ata of the bottomed cylindrical member 46a. A dummy groove portion 46mD that does not pass is formed, and similarly, a dummy slit that does not allow the continuous body 13a of the thread-like elastic member to pass through the outer peripheral surface 46ata at a position that is line-symmetric with respect to the slit portion 46s and the cylinder axis C46a. A portion 46sD is formed, and dummy pulleys 48pD, 48pD, 48pD, and 48tD on which the continuous body 13a of the thread-like elastic member is not hung are provided at positions that are line-symmetric with the pulleys 48p, 48p, 48p, and 48t. And good. And if it does in this way, the dynamic balance which may deteriorate with formation of the groove part 46m, the slit part 46s, and installation of the pulleys 48p, 48p, 48p, and 48t can be returned to the original favorable state.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the configuration including the pair of upper and lower rolls 21u and 21d is exemplified as the joining mechanism 21, but the present invention is not limited to this. That is, other configurations may be used as long as the pair of continuous sheets 11 and 12 can be stacked and joined while being conveyed. For example, the joining mechanism 21 may have a configuration including a pair of upper and lower endless belts (not shown) that circulate around the drive.

  In the above-described embodiment, as an example of the cylindrical member 46a related to the winding mechanism 41, the bottomed cylindrical member 46a having a circular shape in each of the outer peripheral surface 46ata and the inner peripheral surface is illustrated, but is not limited thereto. For example, each cross-sectional shape of the outer peripheral surface and the inner peripheral surface may be a regular polygonal cylinder member such as a regular triangle or a square, or may be a polygonal cylinder member other than a regular polygon.

Further, when a crank-shaped arm member 146 as shown in FIG. 1B is used as a rotating member related to the winding mechanism 141, a counter balance weight portion 146cbw is provided for the arm member 146, thereby The dynamic balance may be improved. Incidentally, in this case, when the arm member 146 and the counter balance weight part 146cbw are made one member, the deviation amount of the center of gravity position of the one member from the rotation axis C146 is the rotation axis of the center of gravity position of the arm member 146 itself. The counter balance weight portion 146cbw is provided so as to be smaller than the deviation amount from C146. Hereinafter, a detailed description will be given with reference to FIGS. 8A and 8B.
8A and 8B are schematic perspective views of an example of an arm member 146 ′ obtained by additionally providing a counter balance weight portion 146cbw with respect to the crank-shaped arm member 146. FIG. As described above, the crank-shaped arm member 146 includes the first pipe portion 146a serving as the rotation axis C146 and the second pipe portion extending outward in the rotational radius direction from the front end portion of the first pipe portion 146a. 146b and a third pipe portion 146c extending forward from the outer end portion of the second pipe portion 146b in parallel with the first pipe portion 146a. In this example, with respect to the arm member 146, the second pipe portion 146b1 and the third pipe portion 146c1 having the same specifications as the second pipe portion 146b and the third pipe portion 146c are used as the counter balance weight portion 146cbw. The rotation axis C146 is provided so as to be symmetrical with the second pipe portion 146b and the third pipe portion 146c, thereby correcting the dynamic balance of the arm member 146.
However, the other second pipe part 146b1 and the third pipe part 146c1 do not necessarily have the same specifications as the second pipe part 146b and the third pipe part 146c, respectively. If the same specification is not used, the dynamic balance correction effect is only smaller than that of the same specification, that is, even in this case, a corresponding correction effect can be obtained.

  In some cases, as shown in FIG. 8B, the second pipe portion 146b and the third pipe portion 146c of the crank-shaped arm member 146 may be combined with the second pipe portion 146b1 and the second pipe portion 146b1 as the counter balance weight portion 146cbw. A plurality of sets of the three pipe portions 146c1 may be provided. For example, in the example of FIG. 8B, a plurality of sets of the second pipe portion 146b and the third pipe portion 146c are provided at an equal pitch in the rotation direction of the arm member 146.

  More specifically, first, three sets of another second pipe portion 146b1 and third pipe portion 146c1 are provided for the second pipe portion 146b and the third pipe portion 146c of the arm member 146. That is, a total of four second pipe portions 146b, 146b1, 146b1,... And a total of four third pipe portions 146c, 146c1, 146c1,... Are provided at an equal pitch of 90 ° in the rotation direction of the arm member 146. Also in this case, a correction effect with a high dynamic balance can be achieved. However, the arrangement pitch in the rotation direction is not limited to 90 °, and may be 120 ° or 60 ° or 45 °.

  Further, as in the arm member 146 ′ ″ shown in FIG. 8C, the second pipe portions 146b and 146b1 adjacent to each other in the rotation direction and the second pipe portions 146b1 and 146b1 adjacent to each other in the rotation direction are appropriately connected. By connecting with the member 147, the rigidity of the second pipe portions 146b, 146b1, 146b1, 146b1 may be increased. In this way, the individual vibrations of the second pipe portions 146b, 146b1, 146b1,... And the third pipe portions 146c, 146c1, 146c1,. The rotation of 146 ″ ″ can be further stabilized.

  In the above-described embodiment, the bottomed cylindrical member 46a is illustrated as an example of the one member when the rotating member and the counterbalance weight portion are a single member, and a plurality of pulleys are provided for the bottomed cylindrical member 46a. Although 48p, 48p, 48p, and 48t are provided to stabilize the running state of the continuous body 13a of the thread-like elastic member in the bottomed cylindrical member 46a, the pulleys 48p, 48p, 48p, and 48t are to be installed. The one member is not limited to the bottomed tubular member 46a. For example, the arm members 146 ′, 146 ″, 146 ′ ″ configured as shown in FIG. 8A and FIG. 8B, that is, the arm member configured to have the counterbalance weight portion 146cbw and the arm member 146 as one member. A plurality of pulleys 48p, 48p, 48p, and 48t may be provided along the travel route of the continuous body 13a of the thread-like elastic member with respect to 146 ′, 146 ″, and 146 ′ ″.

  In the above-described embodiment, the conveyance mechanism 31 of the continuous body 13a of the thread-like elastic member has a pair of belt-like conveyance portions 32 and 32, and each belt-like conveyance portion 32 has a pair of upper and lower endless belts 33u and 33d. However, it is not limited to this. That is, any other configuration may be used as long as the continuous body 13a of the thread-like elastic member is wound by the winding mechanism 41 and the wound continuous body 13a can be conveyed toward the joining mechanism 21. . For example, a screw-like conveyance unit may be used instead of the belt-like conveyance unit 32. That is, the screw-shaped transport unit has a pair of upper and lower round bar-shaped shaft members, and a spiral groove is formed on the outer peripheral surface of each round bar-shaped shaft member over substantially the entire length. Drive around. And a conveyance mechanism may be comprised by arrange | positioning the screw-shaped conveyance part which has this pair of upper and lower round rod-shaped shaft members in each position of the both sides of CD direction, respectively. Incidentally, in this case, the continuous body 13a of the thread-like elastic member is engaged with the spiral groove on the outer peripheral surface of the round bar-shaped shaft member, and the round bar-shaped shaft member is kept in the axial center while substantially maintaining this engaged state. By rotating and rotating around, the continuous body 13a of the thread-like elastic member wound around the pair of screw-like conveyance portions is conveyed in the conveyance direction.

  In the above-described embodiment, the case where both the MD direction as the continuous direction and the CD direction as the intersecting direction are orthogonal to each other is illustrated, but the present invention is not limited thereto. That is, as long as these two are in a crossing relationship with each other, they may not be in an orthogonal relationship.

10 Elastic sheet,
11 continuous sheet, 11e edge,
12 continuous sheets,
13 thread-like elastic member, 13e end,
13a A continuous body of thread-like elastic member, 13ac spanning part, 13C coil body,
20 manufacturing equipment,
21 Joining mechanism,
21u upper roll, 21ua outer peripheral surface,
21d lower roll, 21da outer peripheral surface,
31 transport mechanism, 31b rear end,
32 belt-shaped transport unit,
33u upper endless belt, 33d lower endless belt,
34u pulley, 34d pulley,
35u servo motor, 35d servo motor,
41 winding mechanism, 42 reel mechanism,
43 Feeding section, 44 Tension controller,
44p Drive pulley for feeding, 44s sensor, 45 supply roll,
46 winding part,
46a bottomed tubular member (tubular member, one member), 46at tubular portion, 46af front end portion,
46ata outer peripheral surface, 46m groove, 46mD dummy groove,
46ab bottom plate part, 46s slit part, 46sD dummy slit part,
47 small diameter cylindrical body, 47a outer peripheral surface,
48p pulley, 48pD dummy pulley,
48t input pulley (input part), 48tD dummy input pulley,
49b timing belt, 49p driving pulley,
49m servo motor, 49s drive rotation shaft,
40b endless belt for driving, 40p driving pulley, 40t driving pulley,
40p1 first driving pulley, 40p2 second driving pulley,
40p3 third drive pulley,
51 cutting mechanism, 52 rotary blade,
141 winding mechanism,
146 Arm member (rotating member),
146 ′ arm member (one member), 146 ″ arm member (one member),
146 '''arm member (one member),
146a first pipe section,
146b second pipe part, 146b1 another second pipe part,
146c third pipe part, 146c1 another third pipe part,
146 cbw counter balance weight part, 147 connecting member,
Brg bearing member,
Pn nip position,
C21u rotation axis, C21d rotation axis,
C40s center axis, C46a cylinder axis (rotary axis), C46at cross section center,
C48t rotation axis,
Tr1 end side track, Tr2 center side track, C146 rotation axis,

Claims (9)

An apparatus for producing a stretchable sheet in which individual thread-like elastic members in an elongated state are interposed between a pair of continuous sheets and are joined in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
A joining mechanism for sandwiching and joining the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A transport mechanism that transports the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
A winding mechanism that winds the continuous body of the thread-like elastic member in an extended state around the transport mechanism while feeding out the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. A cutting mechanism,
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is small,
The winding mechanism has a cylindrical member as the one member,
The cylinder member rotates with the cylinder axis of the cylinder member as the rotation axis,
An apparatus for manufacturing a stretchable sheet , wherein an end of the transport mechanism is inserted on an inner peripheral side of the cylindrical member . It is a manufacturing apparatus of the elastic sheet according to claim 1 ,
On the outer peripheral surface of the cylindrical member, a groove is formed along a part of the travel route of the continuous body of the thread-like elastic member,
A stretchable sheet manufacturing apparatus, wherein a continuous body of the traveling elastic thread member is passed through the groove. It is a manufacturing apparatus of the elastic sheet according to claim 1 or 2 ,
The cylinder wall of the said cylinder member is a hollow structure, The manufacturing apparatus of the elastic sheet characterized by the above-mentioned. It is a manufacturing apparatus of the elastic sheet according to any one of claims 1 to 3 ,
The rotating member has a plurality of pulleys that define a traveling route of a continuous body of the thread-like elastic member in the rotating member;
The stretchable sheet manufacturing apparatus, wherein the continuous body of the thread-like elastic member supplied to the rotating member is wound around the pulley and sent to the input portion. It is a manufacturing apparatus of the elastic sheet according to claim 4 ,
The pulley is driven and rotated, and the stretchable sheet manufacturing apparatus is characterized in that: It is a manufacturing apparatus of the elastic sheet according to claim 4 or 5 ,
In the rotating member, a dummy pulley on which a continuous body of the thread-like elastic member is not hung is provided at a position symmetrical with respect to the position of the pulley and the rotation axis. . It is a manufacturing apparatus of the elastic sheet according to claim 2 ,
An apparatus for manufacturing a stretchable sheet, wherein a dummy groove portion through which the continuous body of the thread-like elastic member is not passed is formed at a position symmetrical with respect to the position of the groove portion and the rotation axis in the cylindrical member. It is a manufacturing apparatus of the elastic sheet according to any one of claims 1 to 7 ,
The said rotation member is a product made from aluminum, The manufacturing apparatus of the elastic sheet characterized by the above-mentioned. This is a method for producing a stretchable sheet in which an individual thread-like elastic member in an extended state is interposed between a pair of continuous sheets in a state along a crossing direction intersecting the continuous direction of the continuous sheet. And
The joining mechanism is configured to sandwich and join the pair of continuous sheets in the thickness direction of the continuous sheet while conveying the continuous sheet along the continuous direction of the continuous sheet;
A conveying mechanism that conveys the continuous body of the thread-like elastic member toward the gap between the pair of continuous sheets that are sandwiched and joined by the joining mechanism;
Winding the continuous body of the thread-like elastic member around the transport mechanism in an extended state while the winding mechanism unwinds the continuous body of the thread-like elastic member;
After the pair of continuous sheets are clamped by the joining mechanism, the continuous body of the thread-like elastic members is cut at a position closer to the end side in the intersecting direction than the continuous sheet to generate the individual thread-like elastic members. And having
The winding mechanism is provided on the rotating member that rotates around a predetermined rotation axis, and around the transport mechanism by the rotating operation of the rotating member. A loading unit for loading a continuous body into the transport mechanism; and a counterbalance weight unit provided in the rotating member;
The amount of deviation of the center of gravity position of the one member from the rotation axis when the rotation member and the counter balance weight part are one member than the amount of deviation of the center of gravity position of the rotation member from the rotation axis. Is small,
The winding mechanism has a cylindrical member as the one member,
The cylinder member rotates with the cylinder axis of the cylinder member as the rotation axis,
A method for producing a stretchable sheet , wherein an end of the transport mechanism is inserted on an inner peripheral side of the cylindrical member .

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