JP3779226B2 - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealer which has excellent mass-productivity by a simple structure and can produce uniform seal parts and a method for manufacture of a soft article with the seal part. SOLUTION: When a drum 5 and a rotary base 6 are rotated together, the follower 10a of an oscillating support member 9 oscillatably equipped on the outer circumference of the rotary base 6 is guided by the cum groove 15c of a cam member 15 to oscillate the oscillating support member 9. When the oscillating support member 9 reaches a prescribed rotation point, an anvil 14 supported by the oscillating support member 9 abuts on a horn 8 and leaves the horn 8 at another rotation place. Because the anvil 14 is moved by oscillating motion of the oscillating support member 9, motion as a whole is simple, and a soft work connected by the horn 8 and the anvil 14 can be securely clamped.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device for forming a sealing portion for a continuous soft work for manufacturing soft articles such as disposable diapers and sanitary napkins. In In particular, a sealing device that can perform reliable sealing operations with simple operation. In Related.
[0002]
[Prior art]
An apparatus for producing a continuous soft article such as a diaper by ultrasonically sealing a continuous web at a constant interval is described in, for example, Japanese Patent Publication No. 10-513128 (PCT / US96 / 00618). Yes.
[0003]
In the invention described in the publication, an ultrasonic sealing mechanism including a plurality of ultrasonic horns and anvils is provided on the rotating work drum, and rotates together with the rotating work drum. The web is wound around the outer peripheral surface of the rotating work drum, and the web is sent in the downstream direction from the upstream side as the rotating work drum rotates. The ultrasonic horn is driven by a cam so as to be able to reciprocate in the width direction on the outer peripheral surface of the rotating work drum, and an anvil facing the ultrasonic horn is provided inside the drum. Then, when a continuous web is sent by the rotation of the rotating work drum, the ultrasonic horn crosses the web in the width direction by a certain distance, thereby forming a linear ultrasonic seal portion with respect to the web. Is done.
[0004]
[Problems to be solved by the invention]
However, in the sealing device disclosed in JP 10-513128 A, the operation of reciprocating the ultrasonic horn along the width direction on the outer peripheral surface of the rotating work drum is performed by cam driving, so the rotational speed of the drum Therefore, it is necessary to change the reciprocating speed of the ultrasonic horn accordingly. Therefore, the moving speed of the ultrasonic horn will change according to the production speed, the time of the pressure and time of the sealing conditions will change, and sealing can be performed under good sealing conditions. It becomes difficult. In other words, the sealing device described in the above publication is limited by cam shapes, drum diameters, and the like, so that only a production speed corresponding to these can be realized. Therefore, when an attempt is made to change the production speed after manufacturing the device, there is a structural problem that the allowable range that can be changed is narrow.
[0005]
In the case of continuously sealing absorbent articles such as diapers, rubber or gathers are generally provided in the web, and these are generally ultrasonically sealed together. In products having rubber or gathers, undulations are formed in the web. Therefore, when such a web is sealed with the sealing device disclosed in Japanese Patent Publication No. 10-513128, the super-reciprocating movement as described above is performed. The sonic horn moves up and down in accordance with the undulations, and the pressure applied to the web is likely to change during sealing. Therefore, it is difficult to uniformly ultrasonically seal the web, and there is a problem that the finish and strength of the seal portion are likely to vary.
[0006]
Furthermore, it is necessary to control the air cylinder to apply pressure to the ultrasonic horn when the ultrasonic horn contacts the web, and to release the pressure by controlling the air cylinder when leaving the web. Is required.
[0007]
In addition, when sealing a web for manufacturing the absorbent article or the like, the thickness of the web is often different at the seal location. In this case, when the ultrasonic horn and the anvil are clamped by a single pressurizing means, the thick part of the web is pressed with a larger force than the thin part, so The web melts in a large portion preferentially over a portion having a small thickness. For this reason, there is a problem that the web becomes hard at a thick portion, and the seal strength and the texture of the finish vary depending on the location at the seal location.
[0008]
The present invention is intended to solve the above-described conventional problems, and has a simple structure that is excellent in mass productivity and capable of uniform sealing. The It is intended to provide.
[0009]
Further, the present invention provides a sealing device capable of preventing occurrence of a portion having a different sealing strength or finishing texture by uniformly melting a sealing portion even for a soft work having different thickness dimensions. The It is intended to provide.
[0010]
[Means for Solving the Problems]
The present invention Has a rotating part, a rotation driving means for rotating the rotating part, and a plurality of seal mechanisms arranged along the rotation direction of the rotating part, and sandwiches a soft work in the seal mechanism to A first clamping member and a second clamping member that form a seal portion on the workpiece are provided, and the continuous soft workpiece supplied to the sealing mechanism is within the predetermined range of the circular trajectory of the sealing mechanism. In the sealing device in which the sealing portion is formed by being sandwiched between the sandwiching member and the second sandwiching member,
In the sealing mechanism, the first clamping member is positioned on the rotation center side of the rotating portion, and the seal facing surface is directed outward in the normal direction from the rotation center. The second sandwiching member corresponding to the member is disposed on the outer side in the normal line direction than the first sandwiching member, and the second sandwiching member has a seal-opposing surface of the first sandwiching member. Is supported by the rotating portion so as to be able to rotate to a sandwiching position where pressure is applied toward the seal-facing surface and a retracted position away from the first sandwiching member,
When the rotating portion rotates, the second holding member is rotated to the holding position within the predetermined range, and at least the soft work supply portion to the seal mechanism and the soft from the seal mechanism A swing driving means for rotating the second clamping member to the retracted position is provided at the work discharge portion.
[0011]
Said The present invention Then, since the second clamping member constituting the seal mechanism is rotated away from the radially arranged first clamping member in the radial direction to be in the retracted position, the simple swaying motion can be used for the first clamping member. The two clamping members can be moved to a retracted position that does not interfere with the sealed state and the transfer of the continuous soft workpiece. Further, since the sealing is performed by the operation in which the first clamping member and the second clamping member are brought into contact with each other, the sealing can be performed at a high speed.
[0012]
For example, the continuous soft workpiece has at least a weldable sheet, and the continuous soft workpiece includes a liquid absorber disposed at intervals in the supply direction, and the liquid absorber. And a weldable sheet to be supported, and the liquid absorber is sealed in a state in which the sheets are stacked with the liquid absorber positioned between the seal mechanism and the seal mechanism.
[0013]
By interposing the liquid absorber between the sealing mechanisms, the sheet can be reliably sealed at a portion where there is no liquid absorber.
[0014]
The rotating portion is provided with a rotating drum, and the first clamping member is disposed inside the rotating drum, and a seal facing surface of the first clamping member protrudes from an outer peripheral surface of the rotating drum. It is preferable that it exists in the position to do.
[0015]
With this structure, the sheets can be reliably sealed with the liquid absorber between the sealing mechanisms and on the outer peripheral surface of the rotating drum.
[0016]
Moreover, it is preferable that the seal-facing surface of the second holding member when rotated to the retracted position is rotated to an angle of approximately 90 degrees with respect to the rotation center axis of the rotating portion.
[0017]
By rotating the second sandwiching member in the retracted position to the angle, the second sandwiching member is reliably retracted to a position where it does not interfere with the soft work in the continuous soft work supply unit and discharge unit. It is possible to make it.
[0018]
For example, as the swing driving means, a cam locus fixed at a position where the rotating portion faces is provided, and when the rotating portion rotates, it moves along the cam locus and moves the second clamping member. A follower that is rotated to the clamping position and is rotated to the retracted position is provided.
[0019]
In this case, the cam locus is a continuous cam groove that surrounds the entire circumference of the rotation center of the rotating portion.
[0020]
For example, the follower is attached to a swing support member that supports the second sandwiching member, and when the follower moves along the cam trajectory, the swing support member is moved from the sandwiched position to the sandwiching position. A link mechanism is provided between the swing support member that supports the second clamping member and the follower, and the follower is moved along the cam locus. When moving, the swing support member is rotated to the clamping position and the retracted position via the link mechanism.
[0021]
The second pinching member is provided for each seal mechanism by providing the cam locus fixed in this way and rotating the second pinching member using the rotation operation of the rotating portion as a drive source. There is no need to provide a drive source such as a cylinder mechanism for rotating the.
[0022]
The rotating portion is provided with a swing support member that is swingably supported by the swing shaft, and the second clamping member is supported by the swing support member via an elastic member. It is preferable that when the second clamping member is rotated to the clamping position, the second clamping member is pressurized toward the first clamping member via an elastic force exerted by the elastic member. .
[0023]
By pressing the second clamping member toward the first clamping member via the elastic member, even if the soft work has a structure with unevenness, the seal facing surface of the second clamping member and the first clamping It becomes easy to apply a uniform pressing force to each part of the soft workpiece with the seal-facing surface of the member.
[0045]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
[0046]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a sealing device of the present invention (a sectional view taken along the line I-I in FIG. 3), and FIG. 2 is a perspective view showing a rotating drum of the sealing device and its internal structure. 3 is an explanatory view showing the operating state of the seal device, FIG. 4 is an exploded perspective view showing the configuration of the swing support portion, FIG. 5 is a front view of the cam member on the fixed portion side, and FIG. 7A and 7B are side views showing a state in which the anvil (second clamping member) is rotated to the retracted position with respect to the horn (first clamping member), and FIGS. 7A and 7B show the anvil to the clamping position. It is a side view which shows the process in which it rotates.
[0047]
In the sealing device 1 shown in FIG. 1, a bearing portion 3 is provided on a stationary table 4 that is a stationary portion, and a rotating shaft 3 a is rotatably supported by ball bearings 3 b and 3 b held by the bearing portion 3. Yes. In FIG. 1, the rotation center line of the rotating shaft 3a is indicated by OO. A timing wheel 2 having teeth on the periphery is fixed to a base end portion on the right side of the rotating shaft 3a in the drawing, and a toothed belt is hung on the timing wheel 2. Power from a drive source having a motor (not shown) is applied from the toothed belt to the timing wheel, and the rotating shaft 3a is continuously rotated counterclockwise at a constant angular velocity when viewed from the left side of FIG. . In this embodiment, the drive source, the toothed belt and the timing wheel 2 constitute a rotational drive means.
[0048]
A rotating base 6 serving as a rotating portion is fixed to the rotating shaft 3a, and a rotating drum 5 is fixed to the rotating base 6. The rotating base 6 faces the fixed table 4 in a parallel state.
[0049]
As shown in FIGS. 1 and 2, a plurality of rectangular windows 5 a extending in parallel with the rotation center line OO are formed on the outer peripheral surface 5 </ b> A of the rotary drum 5. Each window 5a is formed at an equal pitch in the circumferential direction of the rotating drum 5, and in this embodiment, each window 5a is provided at six locations at an arrangement angle of 60 degrees with respect to the rotation center line OO. Yes.
[0050]
The rotating part is provided with a seal mechanism. This sealing mechanism is to sandwich and seal a continuous soft workpiece between the first clamping member and the second clamping member. In this embodiment, the sealing mechanism is an ultrasonic sealing mechanism, and this sealing mechanism is The first sandwiching member to be configured is the horn 8 and the second sandwiching member is the anvil 14.
[0051]
The horn 8 and the anvil 14 are both provided in the rotating part and rotate together with the rotating base 6 and the rotating drum 5. The horn 8 is fixed to the rotating base 6 inside the rotating drum 5. Yes. The horn 8 and the ultrasonic wave generation means 7 connected to the horn 8 are arranged radially around the rotation center line OO, and the arrangement angle thereof coincides with the arrangement angle of the window 5a. . Each of the horns 8 protrudes outward from the window 5a of the rotary drum 5, and the seal facing surface 8a at the tip of the horn 8 is outside in the normal direction (radial direction) from the rotation center line OO. The seal facing surface 8a is located in parallel with the central axis OO. The protruding height of the seal facing surface 8a from the outer peripheral surface of the rotary drum 5 is h.
[0052]
The rotation base 6 has a hexagonal shape, and a swing support member 9 is provided on the outer periphery of the rotation base 6. The swing support member 9 includes a swing portion 10 and a holding portion 11, and the swing portion 10 and the holding portion 11 are fixed. The oscillating portion 10 has a substantially sector shape, and the oscillating portion 10 is slidably supported with respect to the outer peripheral portion of the rotating base 6 by an oscillating shaft 10A located at the center of curvature of the fan shape. The rocking shaft 10A is oriented 90 degrees with the rotation center line OO, and the rocking support member 9 is a radial direction about the rotation center line OO around the rocking shaft 10A. It can be turned to the outside.
[0053]
A cam member 15 is fixed to the surface of the fixed table 4 facing the rotary base 6. As shown in FIG. 5, when the cam member 15 is viewed from the front, the cam member 15 has a shape in which a part of the disk is cut out, and this cut-out portion is shown as a broken-out portion 15a.
[0054]
The center of the cam member 15 coincides with the rotation center line OO of the rotating portion. A groove portion 15b is formed on the surface of the cam member 15 between an inner radius R1 and an outer radius R2 with the rotation center line OO as the center of curvature (see FIG. 5). As shown in FIG. 1, the cross-sectional shape of the groove 15b is an arc locus having a radius r1 with respect to the rocking center of the rocking portion 10 (center of the rocking shaft 10A). As shown in FIG. 5, the concave surface of the groove portion 15b has a donut surface shape that surrounds the entire circumference of the rotation center line OO with the rotation center line OO as the center. Further, as shown in the lower part of FIG. 1, the missing part 15 a of the cam member 15 has a shape in which the outer peripheral side of the groove part 15 b is cut off.
[0055]
A cam groove 15c serving as a cam locus is formed on the concave surface of the groove portion 15b. As shown in FIG. 1, the cam groove 15c is concave in the direction perpendicular to the tangent LL of the cylindrical surface of the concave surface of the groove 15b (toward the radial direction with respect to the axis center of the swing shaft 10A). Is formed. A follower 10 a is provided on the fan-shaped surface of the rocking portion 10. This follower 10a is a rotating roller. Alternatively, the follower 10a may be a convex body that does not rotate. When the rotary base 6 rotates, the follower 10a moves along the cam groove 15c. In this embodiment, the cam member 15 and the follower 10a constitute swing driving means for swinging the swing support member 9.
[0056]
As shown in FIG. 5, the cam groove 15c is a circular arc having a constant radius between the rotational positions A2 and A3 at a position away from the rotational center line OO and centered on the rotational center line OO. In the range from the rotational position A0 to A1, it is an arc locus having a constant radius centered on the rotation center line OO at a position close to the rotation center line OO.
[0057]
Therefore, while the follower 10a moves from the rotational position A2 to A3, the swing support member 9 is rotated toward the outer peripheral surface 5A of the rotating drum 5 to the clamping position as shown in the upper part of FIG. It reaches. Further, while the follower 10a moves from the rotational position A0 to A1, the swing support member 9 is rotated approximately 90 degrees toward the fixed table 4 as shown in the lower part of FIG. Become.
[0058]
FIG. 4 shows the holding part 11 from the side facing the rotating drum 5. An elastic member 13 is attached inside the holding portion 11, and an anvil 14 that is a second clamping member of the seal mechanism is supported on the elastic member 13.
[0059]
The holding part 11 is formed with openings 11C and 11C on both sides. An opening portion 11D that is notched in a bowl shape is formed on the side facing the rotating drum 5, and frame portions 11a and 11a serving as receiving portions are provided on both side portions of the opening portion 11D. A side surface of the holding portion 11 where the opening 11D is not formed is a fixed surface 11A, and the swinging portion 10 is fixed to the fixed surface 11A. As shown in FIG. 4, the swinging portion 10 is formed with a support hole 10A1 that is rotatably supported by the swing shaft 10A.
[0060]
The bottom surface of the holding portion 11 is an attachment surface 11B that fixes the elastic member 13. The elastic member 13 is a material that can be elastically deformed, such as rubber, or a material in which a reinforcing material is incorporated into rubber, and has a bag body (casing) that can be flexibly deformed and elastically deformed. It is an air damper or an air spring in which air is supplied as a fluid to the hollow portion of the bag body, and the inside is set to a predetermined pressure by the air pressure.
[0061]
A disc-shaped support plate 13A and a fixed plate 13B are attached to the upper and lower surfaces of the elastic member 13, and tap holes 13a and 13a extending in the vertical direction are provided in the support plate 13A and the fixed plate 13B, respectively. The fixed plate 13B is provided with a nozzle 13b, and an air pipe is connected to the nozzle 13b. The internal pressure of the elastic member 13 can be set via the air pipe and the nozzle 13b. The internal pressure setting means of the elastic member 13 has the same type of structure as that described in FIG. That is, the air pressure supplied to each of the elastic members 13 provided in each of the plurality of sealing mechanisms can be individually adjusted and set.
[0062]
The elastic member 13 is installed inside the holding portion 11 in a state in which a radially bulging portion protrudes from the openings 11C and 11C in the width direction. And it is clamped from the outside of the holding part 11 to the tap holes 13a, 13a provided on the fixing plate 13B by bolts (not shown) inserted into the mounting holes 11b, 11b formed in the mounting surface 11B of the holding part 11, and elastically The member 13 is fixed inside the holding part 11.
[0063]
The diameter d of the support plate 13A of the elastic member 13 is set larger than the width dimension W of the opening 11D. When the elastic member 13 is fixed inside the holding portion 11, the support plate 13A is It faces the inner surfaces 11c and 11c of the portions 11a and 11a. Therefore, in a state where the elastic member 13 is expanded, the surface of the support plate 13A is brought into pressure contact with the inner surfaces 11c and 11c.
[0064]
Here, the inner surfaces 11c and 11c of the frame portions 11a and 11a are not parallel to the mounting surface 11B, and the inner surfaces 11c and 11c are inclined away from the mounting surface 11B as they move away from the swinging portion 10 at an inclination angle θ. It is inclined. The fixed surface 11A and the mounting surface 11B to which the swinging portion 10 is fixed are perpendicular to each other.
[0065]
Accordingly, the elastic member 13 expands in the holding portion 11, and the surface of the support plate 13A is pressed against the inner surfaces 11c and 11c of the frame portions 11a and 11a, and the surface of the support plate 13A is the mounting surface 11B. The surface of the support plate 13A is inclined at an inclination angle θ so as to move away from the mounting surface 11B as the distance from the swinging portion 10 increases.
[0066]
The anvil 14 has a base 14A having a constant thickness in the longitudinal direction, and a pair of convex portions 14B and 14B extending in parallel to the longitudinal direction are formed on the surface of the base 14A. The surface of the convex portions 14B, 14B is a seal facing surface 14a facing the horn 8, and this seal facing surface 14a is a pattern surface that sets the pattern shape of the seal portion formed on the continuous soft workpiece. ing.
[0067]
The base 14A of the anvil 14 is provided with through holes 14A1 and 14A1 at two positions on both ends in the longitudinal direction, and the base 14A is attached to the support base 14C with bolts (not shown). Furthermore, two through holes (not shown) are formed in the support base 14C, and the base 14A and the support base 14C are formed by fastening bolts (not shown) inserted into the tap holes 13a and 13a described above into the through holes. The support plate 13A is fixed in close contact with the surface of the support plate 13A.
[0068]
The support base 14C of the anvil 14 and the seal facing surface 14a are parallel. Therefore, in a state where the anvil 14 is fixed to the support plate 13A of the elastic member 13 in the holding portion 11, the seal facing surface 14a is moved away from the swing portion 10 (the swing shaft 10A) as the mounting surface 11B. It inclines with the said inclination-angle (theta) so that it may distance from.
[0069]
Next, an example of a continuous soft workpiece 30 supplied to the sealing device 1 will be described with reference to FIG. The soft work 30 is supplied to the sealing device 1 in a folded state as shown in FIG. FIG. 9 shows a state in which a seal portion is formed, and shows a IX-IX cross section of FIG. 8B, and FIG. 10 shows a XX cross section of FIG. 8B and FIG. .
[0070]
FIG. 8B shows a state in which the sealing portion 1 is formed by the horn 8 and the anvil 14 on the continuous soft work 30 by the sealing device 1. After forming the seal portion S on the continuous soft work 30, the pants-type disposable which is a soft absorbent article is cut by a cutting line C1-C1 between the adjacent seal portion S and the seal portion S. Diapers are manufactured. FIG. 8A shows a state in which the continuous soft work 30 is developed.
[0071]
In the developed belt-like body shown in FIG. 8A, the first sheet 32 is positioned on the back side in the figure, and the second sheet 31 is overlaid thereon. The first sheet 32 is wider than the second sheet 31, and on one side 30 </ b> A shown in FIG. 8A, the side edge 32 a of the first sheet 32 is the second sheet 31. It is folded so that it can be overlaid. Similarly, on the other side 30 </ b> B, the side edge 32 b of the first sheet 32 is folded so as to be superimposed on the second sheet 31. This folded state is shown in FIG.
[0072]
As shown in FIG. 10, a plurality of waistbands 35 are sandwiched between the first sheet 32 and the second sheet 31 on one side 30 </ b> A of the belt-like body. In addition, a waist band 36 is sandwiched between the first sheet 32 and the second sheet 31 on the other side 30 </ b> B of the belt-like body. A plurality of waistbands 35 and waistbands 36 are provided, and each waistband is arranged in parallel and is arranged extending linearly in the feeding direction of the belt-like body.
[0073]
Further, leg bands 37 and 38 are provided between the first sheet 32 and the second sheet 31. A plurality of leg bands 37 and leg bands 38 are provided. Each of the leg band 37 and the leg band 38 extends in the feeding direction of the belt-like body in a state of being curved in a wave shape. And as shown to FIG. 8 (A), the leg hole 34 used as the leg insertion part when it turns into underwear is formed in the area | region enclosed by the said leg band 37 and the leg band 38. As shown in FIG.
[0074]
The waistbands 35 and 36 and the legbands 37 and 38 are sandwiched between the first sheet 32 and the second sheet 31 in a state where the waistbands 35 and 36 and the leg bands 37 and 38 are stretched at a predetermined magnification in the feeding direction of the band-shaped body. The first sheet 32 and the second sheet 31, and the waist bands 35 and 36 and the leg bands 37 and 38 sandwiched between the first sheet 32 and the second sheet 31 are bonded to each other with a hot melt adhesive or the like.
[0075]
The first sheet 32 and the second sheet 31 are air permeable and liquid blocking, and can be fused by heat. For example, a spunbond nonwoven fabric or meltblown nonwoven fabric formed of thermoplastic synthetic fibers, or a laminate of the nonwoven fabrics. Alternatively, one of the first sheet 32 and the second sheet 31 may be the nonwoven fabric and the other may be a breathable plastic film.
[0076]
The waistbands 35 and 36 and the legbands 37 and 38 are elastic elastic members such as thread-like or band-like rubber and synthetic rubber.
[0077]
On the surface of the second sheet 31, the liquid absorber 33 is installed between the leg hole 34 and the leg hole 34. The liquid absorber 33 has an hourglass shape or a rectangular shape, and is arranged at a certain interval in the feeding direction of the strip. The liquid absorber is pulverized pulp, a mixture of pulverized pulp and a water-absorbing polymer (SAP), a laminate of hydrophilic nonwoven fabric, air laid pulp, or the like. These absorbent materials are wrapped in a liquid-permeable top sheet. Each liquid absorber 33 is bonded to the surface of the second sheet 31 with a hot melt adhesive or the like.
[0078]
The top sheet is formed of a spunlace nonwoven fabric, an air-through nonwoven fabric, a plastic film in which liquid permeation holes are formed, or the like.
[0079]
A continuous soft work 30 shown in FIG. 8B is formed by folding the belt-like body shown in FIG. 8A in a two-ply manner along a center line O1-O1 extending in the longitudinal direction. When the soft work 30 is supplied to the sealing device 1, the horn 8 is in a state where the first sheet 32 and the second sheet 31 are stacked between the liquid absorbers 33 and 33. And anvil 14 and are ultrasonically sealed. As shown in FIG. 10, in the soft work 30 sandwiched between the horn 8 and the anvil 14, four sheets of two first sheets 32 and two second sheets 31 are overlapped at an intermediate portion. The thickness is the smallest.
[0080]
Also, on the side that becomes the waist side, First The side edges 32a and 32b of the sheets 32 and 32 overlap, and the waistbands 35 and 36 are interposed to increase the thickness. On the leg side which is the leg hole 34 side, the four sheets and the leg bands 37 and 38 are interposed, and the thickness at the leg side is larger than the intermediate portion and smaller than the waist side. It has become.
[0081]
The first sheet 32 and the second sheet 31 are formed of a heat-sealable material, generate heat internally by vibrations applied from the horn 8, and each sheet is formed on the seal-facing surface 14a of the anvil 14. The seal portion S is formed by welding according to the shape of the convex pattern.
[0082]
In the example of FIG. 8B, the pattern of the seal portion S formed by the minute convex pattern is formed such that fine seal lines form a row. After the sealing part S is formed by the sealing device 1, a pants-type disposable diaper that is a soft absorbent article is cut between the adjacent sealing part S and the sealing part S along a cutting line C1-C1. Is completed.
[0083]
The soft absorbent article manufactured by the sealing device 1 of the present invention may be a sanitary napkin or a panty liner.
[0084]
Hereinafter, the operation of the sealing device 1 will be described.
As shown in FIG. 2, the continuous soft work 30 is wound around a supply roll 21 provided in the supply unit (i) and supplied to the outer peripheral surface 5 </ b> A of the rotary drum 5. The continuous soft work 30 is wound around the outer peripheral surface 5A of the rotating drum 5 (more specifically, the seal-facing surface 8a of the horn 8 protruding from the outer peripheral surface 5A) at an angle of about 180 degrees, and the discharge part (ii) 2, the sheet is separated from the rotary drum 5, and the discharge roll 22 is wound around and pulled out.
[0085]
The continuous soft work 30 is continuously fed to the supply unit (i) at a constant speed, and in the sealing device 1, rotational power is transmitted to the timing wheel 2 to rotate the rotary shaft 3a and the rotary unit. The base 6 and the rotating drum 5 rotate counterclockwise in FIGS. 2 and 3 at a constant angular velocity.
[0086]
Here, the continuous soft work 30 comes into contact with the seal facing surface 8a of the horn 8 protruding from the outer peripheral surface 5A of the rotating drum 5, and the rotating drum 5 rotates in this state. Therefore, in this embodiment, the angular speed of the rotating portion is set so that the rotational peripheral speed of the seal facing surface 8a matches the supply speed of the continuous soft work 30. Therefore, on the outer peripheral surface 5A of the rotating drum 5, the seal-facing surface 8a of the horn 8 and the continuous soft work 30 circulate together without slipping each other.
[0087]
Further, the arrangement pitch in the circumferential direction of the horns 8 protruding from the outer peripheral surface 5A of the rotary drum 5 is the arrangement pitch of the liquid absorbers 33 of the continuous soft work 30 and the arrangement pitch of the leg holes 34 shown in FIG. It matches. Therefore, when the continuous soft work 30 is supplied to the outer peripheral surface 5A of the rotary drum 5, as shown in FIG. 9, the liquid absorber 33 is placed between the horn 8 and the horn 8 (between the seal mechanism and the seal mechanism). ), A portion where the liquid absorber 33 does not exist is installed on the seal facing surface 8a of the horn 8.
[0088]
While the rotating base 6 and the rotating drum 5 rotate counterclockwise at a constant speed, the follower 10a provided on the swinging portion 10 of the swinging support member 9 is cam of the cam member 15 provided on the fixed table 4. It moves along the groove 15c.
[0089]
As shown in FIGS. 3 and 5, when the follower 10a moves in the cam groove 15c between the rotation positions A0 to A1 by the rotation of the rotation base 6, the follower 10a is rotated by the cam groove 15c. It is moved in a direction approaching the line OO. Therefore, during this time, as shown in the lower part of FIG. 1 and FIG. 6, the swing support member 9 is rotated outwardly in the radial direction around the swing shaft 10 </ b> A and held by the swing support member 9. The anvil 14 being turned is directed outward at an angle of approximately 90 degrees with respect to the rotation center line OO. At this time, since the swing support member 9 is rotated in the missing portion 15a of the cam member 15, the seal facing surface 14a of the anvil 14 is 90 degrees with respect to the rotation center line OO. The swing support member 9 can rotate.
[0090]
The supply part (i) and the discharge part (ii) of the continuous soft work 30 are located between the rotation positions A0 to A1. During this time, the anvil 14 is retracted so as not to interfere with the continuous soft work 30 in the travel path of the continuous soft work 30 supplied to the rotary drum 5 and the travel path of the continuous soft work 30 discharged from the rotary drum 5. Rotate to position. Therefore, the supply and discharge of the continuous soft work 30 are not hindered by the anvil 14.
[0091]
While the follower 10a moves from the rotational position A1 to A2, the follower 10a is guided by the cam groove 15c and moved in the outer circumferential direction. Therefore, when the swing support member 9 is rotated toward the outer peripheral surface 5A of the rotary drum 5 and exceeds the rotational position A2, a liquid absorber 33 for the continuous soft work 30 is provided as shown in FIG. 10, the first sheet 32 and the second sheet 31 shown in FIG. 10 and the laminated body of the waist bands 35 and 36 and the leg bands 37 and 38 are opposed to the seal facing surface 8 a of the horn 8 and the seal of the anvil 14. It is pinched by the surface 14a. This state continues until the rotational position A3.
[0092]
Further, while the follower 10a reaches from the rotational position A3 to A0, the follower 10a is guided to the rotation center line OO side by the cam groove 15c, and the anvil 14 rotates in a direction away from the horn 8 and the continuous soft work 30. To do. When the rotation position A0 is reached, as shown in FIG. 6 again, the anvil 14 rotates to an angle of about 90 degrees with respect to the rotation center line OO and becomes the retracted position.
[0093]
Then, while the follower 10a of each swing support member 9 is from the rotational position A2 to A3, the ultrasonic wave generating means 7 is energized for a predetermined time, and the horn 8 oscillates for a predetermined time, as shown in FIG. 8B. The seal portions S and S are formed on the continuous soft workpiece 30, and the soft workpiece 30 is fused by the seal portions S and S. Then, the continuous soft work 30 that has been sealed as shown in FIG. 8B is discharged by the discharge roll 22. And after coming out from the discharge roll 22, it is cut | disconnected by the cutting line C1-C1 shown in FIG. 8 (B) between the seal part S and the seal part S, and each underpants type diaper is manufactured.
[0094]
FIG. 6 shows a state where the swing support member 9 is rotated to the retracted position. In this state, the seal facing surface 8a at the tip of the horn 8 coincides with the rotation center line OO and a surface Lh parallel to the outer peripheral surface 5A of the rotating drum 5, and the swing support member 9 swings. The moving center (the center of the swinging shaft 10A) is located on the surface Lh. In FIG. 6, a plane that passes through the oscillation center and is perpendicular to the plane Lh is represented by Lv. In the state of FIG. 6, the attachment surface 11B of the holding portion 11 of the swing support member 9 is parallel to the surface Lv.
[0095]
In the state of FIG. 6, the seal facing surface 14 a of the anvil 14 rotating to the retracted position slightly protrudes toward the horn 8 from the surface Lv. This amount of protrusion is the margin of contraction of the elastic member 13 when the anvil 14 is pressed against the horn 8 by reaching the clamping position.
[0096]
Air supply is controlled to the elastic member 13 through the nozzle 13b so as to have a predetermined internal pressure. In the state of FIG. 6, the support plate 13 </ b> A of the elastic member 13 is pressed against the inclined inner surface 11 c of the frame portion 11 a of the holding portion 11 by the internal pressure of the elastic member 13. Therefore, the seal facing surface 14a of the anvil 14 is inclined at an inclination angle θ with respect to the surface Lv so that the protruding amount from the surface Lv increases as the distance from the swing shaft 10A increases.
[0097]
While the follower 10a reaches from the rotational position A1 to A2 shown in FIGS. 3 and 5, the swing support member 9 rotates toward the outer peripheral surface 5A of the rotating drum 5, and in the final stage of this rotating operation, FIG. 7 (A), the seal facing surface 14a of the anvil 14 hits the seal facing surface 8a of the horn 8 with the continuous soft work 30 interposed therebetween.
[0098]
Here, in FIG. 6, the seal facing surface 14 a of the anvil 14 is inclined toward the contact direction with the horn 8 as it moves away from the center of swinging. When the support member 9 is rotated by (90 degrees −θ) from the state of FIG. 6, the seal facing surface 14 a of the anvil 14 is substantially parallel to the seal facing surface 8 a of the horn 8.
[0099]
When the follower 10a reaches the rotational position A2 and the swing support member 9 is rotated 90 degrees from the surface Lv as shown in FIG. 7B, the surface of the support plate 13A of the elastic member 13 is held. The anvil 14 receives the elastic force of the elastic member 13 toward the horn 8 with the mounting surface 11B, the support plate 13A, and the seal facing surface 14a being parallel or substantially parallel to each other, away from the inner surface 11c of the frame portion 11a of the portion 11. It is elastically pressurized.
[0100]
Thus, since the seal facing surface 14a of the anvil 14 protrudes from the surface Lv with the inclination angle θ in the state of FIG. 6, the seal facing surface 8a of the horn 8 is in the state of FIG. And the seal-facing surface 14a of the anvil 14 are in contact with each other in a parallel or nearly parallel state, and then the elastic pressure from the elastic member 13 acts on the anvil 14. Therefore, when the anvil 14 is brought into pressure contact with the horn 8 by the turning operation, an operation in which the seal facing surface 14a of the anvil 14 is displaced along the surface Lh with respect to the seal facing surface 8a of the horn 8 is less likely to occur.
[0101]
This is because the seal facing surface 14a of the anvil 14 and the seal facing surface 8a of the horn 8 come into contact with each other as parallel surfaces, and the surfaces of the seal facing surfaces 8a and 14a are hardly damaged. In addition, since the continuous soft work 30 is sandwiched between flat surfaces, the continuous soft work 30 is surely sandwiched between the seal facing surface 8a and the seal facing surface 14a.
[0102]
Moreover, when the continuous soft work 30 is a continuous body of a pants-type disposable diaper, as shown in FIG. 10, in the part which forms the seal | sticker part S with the horn 8 and the anvil 14, it is the continuous soft work 30. Is not flat. That is, the thickness is the largest on the waist side, the thickness is thin in the middle, and the thickness is further increased on the leg side. Therefore, the soft work 30 to be sealed is partially different in thickness, and the surface thereof is uneven.
[0103]
As described above, the portion where the seal portion S is formed is not uniform in thickness but locally changes in thickness, but the anvil 14 has air (fluid) sealed inside a bag-like elastic body. Since the air damper is pressurized toward the horn 8, the seal facing surface 14 a of the anvil 14 can flexibly cope with a change in the thickness of the continuous soft work 30. Moreover, the continuous soft work 30 is pressed almost uniformly at each location of the seal portion S by the horn 8 and the anvil 14 by the pressure inside the elastic member 13. Therefore, the seal quality of the seal portion S can be made uniform.
[0104]
The internal pressure of the elastic member 13 in the bag can be controlled by supplying air pressure from the nozzle 13b. Therefore, it is possible to easily control to change the internal pressure of the elastic member 13 in the bag according to the material and structure of the continuous soft work 30 to be sealed. Therefore, even when the structure of the continuous soft work 30 is changed and the seal pattern of the seal facing surface 14a of the anvil 14 is changed accordingly, only by changing the internal pressure of the elastic member 13, Setup setup can be completed, and sealing work can always be performed under optimum conditions.
[0105]
Further, since the sealing mechanism employs a mechanism that performs sealing after sandwiching the continuous soft work 30, the energization time to the ultrasonic wave generating means 7 is set to a predetermined time, and the sealing pressure is set to a predetermined pressure. By setting the size, the sealing conditions can be kept constant at any production speed, and various production speeds can be realized.
[0106]
Furthermore, the position of the ultrasonic generator 7 can be varied in the normal direction (radial direction) with respect to the rotating drum 5 so that the protruding height h of the tip of the horn 8 from the outer peripheral surface 5A of the rotating drum 5 can be changed. It is preferable that they are attached as described above. If comprised in this way, the said protrusion height h can be changed according to the thickness of the liquid absorber 33 of the soft workpiece | work 30, and even if it is any product provided with the liquid absorber, between sheets Can be securely sealed.
[0107]
Further, when the continuous soft work 30 is formed by folding the liquid absorber 33 with each sheet as shown in FIG. 8B, the protrusion height h shown in FIG. The thickness T of the continuous soft work 30 at the portion where the absorber 33 is provided is approximately ½, that is, the protruding height h is substantially equal to the thickness of the liquid absorber 33 in the expanded state. Is preferred.
[0108]
With this setting, the sheets 31 and 32 can be reliably sandwiched between the horn 8 and the anvil 14 without being affected by the thickness of the liquid absorber 33 at a portion where the liquid absorber 33 is not provided. become.
[0109]
Moreover, in the said embodiment, although the horn 8 is fixed to the rotation centerline OO side and the anvil 14 is provided in the outer side so that rocking | fluctuation is possible, conversely, the anvil 14 is on the rotation centerline OO side. It may be fixed and provided so that the horn 8 swings. Further, the sealing mechanism may be a heat sealing mechanism that heats the first clamping member and the second clamping member and clamps and seals a continuous soft work by both members.
[0110]
In the first embodiment, the swing support member 9 is provided with a follower 10a serving as a convex portion and the cam member 15 is formed with a cam groove 15c as the swing drive means. The cam member may have a convex cam trajectory, and the swing support member may have a concave portion guided by the convex cam trajectory.
[0111]
Further, as a swing driving means for swinging the swing support member 9, a cylinder mechanism or a link mechanism may be used as in the second embodiment described below.
[0112]
The elastic member 13 that pressurizes the anvil may be a coil spring or the like.
[0113]
11 to 14 show a second embodiment of the sealing device of the present invention. FIG. 11 is a longitudinal sectional view, FIG. 12 is a front view showing the structure of the cam member, and FIG. FIG. 14 is a side view showing the support state, and FIG. 14 is a configuration diagram of a pipe line for setting the internal pressure of the elastic member.
[0114]
The sealing device 40 shown in FIG. 11 is the same as the sealing device 1 shown in the first embodiment, the number of vibration driving means, ultrasonic wave generating means, the number of elastic members that support the anvil 14, and the number shown in FIG. The only difference is the setting condition of the internal pressure to each elastic member using the pipe, and the other configuration is substantially the same.
[0115]
That is, the supplied soft work 30 is the same as that shown in FIGS. Further, the seal timings A0, A1, A2, and A3 of the seal mechanism are the same as those of the seal device 1, and the anvil when the swing support member rotates to the retracted position or the position of the swing support member rotates to the retracted position. 14, the relative operation of the anvil 14 and the horn 8 when the anvil 14 rotates and hits the horn 8, the optimum value of the protrusion height h of the horn 8 from the rotating drum 5, etc. Same as 1.
[0116]
In addition, below, the same code | symbol is attached | subjected to the same component as the sealing device 1 of 1st Embodiment, and the detailed description is abbreviate | omitted.
[0117]
The sealing mechanism in the sealing device 40 shown in FIGS. 11 and 12 is an ultrasonic sealing device including a horn 8 that is a first clamping member and an anvil 14 that is a second clamping member. Unlike the first embodiment, the horn 8 is vibrated by a plurality of ultrasonic wave generating means 7, and in this embodiment, as shown in FIG. Each of the sealing mechanisms is provided with two ultrasonic wave generating means 7A and 7B. The two ultrasonic wave generating means 7A and 7B are arranged in the width direction of the rotating drum 5, that is, the direction in which the rotation center line OO of the rotating drum 5 extends. When vibration is given to the horn 8 by the ultrasonic wave generating means 7A and 7B arranged in this way, the output of ultrasonic vibration given from the horn 8 to the soft work 30 can be increased.
[0118]
As shown in FIG. 10, in the part which forms the seal part S of the said soft workpiece | work 30, the thickness of a laminated body is large in a waist side and a leg side. Therefore, by arranging the two ultrasonic wave generating means 7A and 7B along the rotation center line OO, ultrasonic vibration can be efficiently applied to the thick part of the soft work 30. The entire seal area of the soft work 30 can be uniformly melted.
[0119]
In each sealing mechanism, ultrasonic vibration is applied to the common horn 8 by the two ultrasonic generation means 7A and 7B, but separate horns are supported by the respective ultrasonic generation means 7A and 7B. It may be a thing.
[0120]
The rotary drum 5 is fixed to a rotary base 6 having a regular hexagonal front shape as shown in FIG. A swing support member 50 is supported at the center of each side of the regular hexagon of the rotary base 6. Therefore, the arrangement angle of the swing support member 50 is an interval of 60 degrees. The swing support member 50 includes a swing portion 51 and a holding portion 52, and the swing portion 51 and the holding portion 52 are fixed. Each of the swinging parts 51 is swingably supported on the side of the rotary base 6 by a swinging shaft 51A. The swing shaft 51A is oriented in a direction orthogonal to the rotation center line OO.
[0121]
A cam member 60 constituting a swing driving means is fixed to the surface of the fixed table 4 facing the rotation base 6. The cam member 60 has a flat plate shape having a predetermined thickness dimension, and a cam groove 61 serving as a cam locus is formed on the front surface thereof. The cam groove 61 is continuous around the rotation center line OO, and the depth direction of the recess of the cam groove 61 is parallel to the rotation center line OO.
[0122]
As shown in FIG. 11, a link mechanism is provided between each swinging portion 51 and the cam member 60. In this link mechanism, a drive link 53 is rotatably supported by the swinging part 51 via a connecting shaft 51B provided in a direction orthogonal to the rotation center line OO.
[0123]
On the back surface of the rotation base 6, a base 54A of a rotation link 54 is rotatably supported by a support shaft 54a. The axial direction of the support shaft 54a is parallel to the rotation center line OO. A distal end portion of the drive link 53 is rotatably connected to a distal end portion of an arm portion 54B of the rotation link 54 via a connecting shaft 55. The axial direction of the connecting shaft 55 is parallel to the rotation center line OO.
[0124]
A driving member 56 is attached to the rotation link 54. The drive member 56 has a drive support 56a fixed so as not to rotate in the middle of the rotation link 54, and a follower 56b provided on the drive support 56a. The follower 56b can move in the cam groove 61. The follower 56b rolls in the cam groove 61 or slides without rolling.
[0125]
In FIG. 12, the drive support 56a is not shown, and the relative positional relationship between the rotation link 54, the follower 56b, and the drive link 53 is shown.
[0126]
When the rotary base 6 rotates, the follower 56 b moves along the cam groove 61. At this time, the distance between the follower 56b and the rotation center line OO changes according to the shape of the cam groove 61. In response to this change, the rotation link 54 is rotated, and the swing support member 50 is further rotated via the drive link 53. In this embodiment, the cam member 60 and the follower 56b constitute swing driving means.
[0127]
The swing support member 50 is rotated by the cam groove 61. The timing of this rotation is the same as that of the seal device 1 of the first embodiment. When the follower 56b moves between A2 and A3, the swing support member 50 rotates around the swing shaft 51A toward the outer peripheral surface 5A of the rotary drum 5 to reach the clamping position. Further, while the follower 56b moves between A0 and A1, the swing support member 50 is in the retracted position rotated about 90 degrees toward the fixed table 4 about the swing shaft 51A. .
[0128]
As shown in FIGS. 11 and 13, in the second embodiment, two elastic members 71 and 72 are provided in each holding portion 52. The two elastic members 71 and 72 are arranged in the width direction of the rotating drum 5, that is, in the direction along the rotation center line OO.
[0129]
The elastic members 71 and 72 are the same as the elastic member 13 shown in FIG. 4, and air is supplied to the elastically deformable bag body as a fluid.
[0130]
The basic structure of the holding portion 52 is the same as that of the holding portion 11 shown in FIG. 4, and the two elastic members 71 and 72 are attached to the mounting surface 52B of the holding portion 52 via fixing plates 71A and 71B. It is fixed. Further, frame portions 51a and 51a similar to the frame portions 11a and 11a shown in FIG. 4 are formed on the portion facing the mounting surface 52B, and the inner surfaces 51c and 51c of the frame portions 51a and 51a are It has an inclination angle θ with respect to a plane parallel to the mounting surface 52B, and the inner surfaces 51c, 51c are inclined so as to approach the horn 8 as they move away from the swing shaft 51A. .
[0131]
A support plate 70 is fixed to the tips of the elastic members 71 and 72, and the anvil 14 is fixed to the support plate 70. In a state where the anvil 14 is not in contact with the horn 8, the support plate 70 is pressed against the inner surfaces 51 c and 51 c by the fluid pressure inside the elastic members 71 and 72. Has the tilt angle θ. The effect of providing the inclination angle θ is the same as that of the sealing device 1 of the first embodiment.
[0132]
The fixing plates 71A and 72A are provided with nozzles 73 and 74, and air pipes 75 and 76 are connected to the nozzles 73 and 74, respectively. The internal pressures of the elastic member 71 and the elastic member 72 can be individually set via the air pipes 75 and 76 and the nozzles 73 and 74.
[0133]
As shown in FIG. 10, in the seal region sandwiched between the horn 8 and the anvil 14 in the soft work 30, the thickness of the waist side is larger than the thickness of the leg side. Therefore, in this embodiment, the internal pressure of the elastic member 72 pressing the anvil 14 on the leg side is slightly higher than the internal pressure of the elastic member 71 pressing the anvil 14 on the waist side. Set.
[0134]
As a result, the anvil 14 is pressed relatively strongly against the horn 8 on the leg side, and the anvil 14 is pressed relatively weakly against the horn 8 on the waist side. As a result, the soft workpieces 30 having different thicknesses are in substantially the same molten state over the entire length from the waist side to the leg side. As a result, it is possible to avoid a phenomenon in which a part of the seal portion S becomes stiff and deteriorates in the finished absorbent article without being partially melted excessively.
[0135]
In addition, since uniform seals are formed at portions having different thicknesses, poor sealing hardly occurs even if the internal pressures of both the elastic members 71 and 72 are not excessive. Therefore, it is easy to prevent the occurrence of defects such as an excessive pressure acting on the soft workpiece and the sheet being melted.
[0136]
Individual setting of the internal pressure in the plurality of elastic members 71 and 72 is effective when the soft work 30 has portions having different thicknesses as described above, but instead of or in addition to this. This is also effective when different materials are distributed in the seal portion. For example, when a material with a different melting temperature is located in the seal part, the internal pressure of the elastic member is increased at the part facing the material having a high melting temperature, and the part facing the material having a low melting temperature. To weaken the internal pressure of the elastic member. As a result, a uniform seal portion is formed.
[0137]
In this embodiment, the anvil 14 is single, but the anvil pressurized by the elastic member 71 and the anvil pressurized by the elastic member 72 may be provided separately. Alternatively, by using a single anvil and forming a thin portion between the portion supported by the elastic member 71 and the portion supported by the elastic member 72, the portion pressed by the elastic member 71 and the elastic member 72 The part to be pressed may be easily operated individually.
[0138]
FIG. 14 shows conduits serving as pressure setting means that can be set by changing the internal pressure of each elastic member 71 and each elastic member 72 provided in each seal mechanism.
[0139]
High pressure air is supplied to the two pressure setting units 81 and 82 from an air pressure generating unit 80 such as an air pump. One pressure setting unit 81 is used to set the supply pressure to the elastic members 71 and 72 to a predetermined value when the soft work 30 is sealed. The other pressure setting part 82 is for releasing the air in the elastic members 71 and 72 and releasing the pressing of the support plate 70 by the elastic members 71 and 72. This is set at the time of setup work such as supplying the soft work 30 to the sealing device 40 at the start of the sealing work and rotating the rotary drum 5 for a predetermined time. The pressure setting units 81 and 82 are constituted by a regulator using a diaphragm.
[0140]
The pressure setting unit 81 and the pressure setting unit 82 are switched by a switching valve 84. A pressure sensor 85 is provided at the tip of the switching valve 84. The pressure sensor 85 generates an electric signal 85a when the pressure in the pipe line falls below a predetermined value. When the electric signal 85a is obtained, the sealing work by the sealing device 40 is stopped. .
[0141]
Each sealing mechanism is provided with a pressure reducing adjustment valve 86 that communicates with the inside of the elastic member 71 via a pipe 75 and a pressure reducing adjustment valve 87 that communicates with the inside of the elastic member 72 via a pipe 76. During the sealing operation, the pressure set by the pressure setting unit 81 is reduced by the pressure reducing adjustment valve 86 and supplied to the elastic member 71, and the pressure is reduced by the pressure reducing adjusting valve 87 and supplied to the elastic member 72.
[0142]
The pressure reducing adjustment valves 86 and 87 can be set by individually adjusting the pressure supplied to the elastic members 71 and 72 by adjusting the opening of the valves. Thereby, as described above, for example, the internal pressure of the elastic member 71 is set to be slightly low, and the internal pressure of the elastic member 72 is set to be slightly high.
[0143]
In addition, a pressure reducing adjustment valve that simultaneously adjusts all the air pressures supplied to the plurality of elastic members 71 provided in each seal mechanism, and a pressure reducing adjustment valve that adjusts all the air pressures supplied to the plurality of elastic members 72 simultaneously. It may be provided.
[0144]
14, the pressure sensor 85 and the pressure reducing adjustment valves 86 and 87 are mounted on the rotary base 6, and the pipe connecting the switching valve 84 and the pressure sensor 85 has a rotation center line OO. And is further extended to the outside of the sealing device 40 via a rotating joint.
[0145]
In the sealing device 1 of the first embodiment, the same pipe line as shown in FIG. 14 is used. However, in the sealing device 1, one decompression adjusting valve corresponding to each sealing mechanism is provided.
[0146]
In the second embodiment, the holding portion 52 is provided with the two elastic members 71 and 72. However, the present invention is not limited to this, and three or more elastic members are provided. It may be a thing.
[0147]
【The invention's effect】
According to the present invention described in detail above, it is possible to form a seal portion at an intermittent portion at a high speed with respect to a continuous soft workpiece. In addition, since the second clamping member of the seal mechanism is rotated outward in the radial direction and separated from the first clamping member, the continuous soft work by the first clamping member and the second clamping member It is possible to quickly and reliably perform clamping and releasing. Further, since the clamping and releasing can be performed only by swinging the second clamping member, the operation of the apparatus can be simplified and the mechanism structure can be simplified.
[0148]
In particular, when the second clamping member is rotated by the cam member, the second clamping member can be operated in the clamping and releasing directions using the rotational power of the rotating portion, and the power source is minimized. Is possible.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a sealing device of the present invention, and is a cross-sectional view taken along the line II in FIG.
FIG. 2 is a perspective view illustrating a rotating part of the sealing device;
FIG. 3 is an explanatory view showing an operating state of the sealing device;
FIG. 4 is an exploded perspective view showing the structure of a swing support member;
FIG. 5 is a front view showing the shape of the cam member on the fixed portion side;
FIG. 6 is a side view showing a state where the anvil has moved to a retracted position away from the horn;
7A is a side view showing a state where the swing support member is rotated and the anvil is in contact with the horn, and FIG. 7B is a state where the elastic member is contracted and the anvil is pressed against the horn. Side view,
8A is a perspective view showing a developed state of a continuous soft work, FIG. 8B is a perspective view showing a continuous soft work being supplied to a sealing device,
9 is a cross-sectional view showing a state in which a continuous soft work is sandwiched between a horn and an anvil, and the cross-sectional direction of the soft work is a IX-IX cross section of FIG. 8B.
FIG. 10 is a cross-sectional view showing a state in which a continuous soft work is sandwiched between a horn and an anvil, and the cross-sectional direction of the soft work is the XX cross section of FIG.
FIG. 11 is a longitudinal sectional view showing a second embodiment of the sealing device of the present invention,
FIG. 12 is a front view showing the structure of a cam member;
FIG. 13 is a side view of the swing support part;
FIG. 14 is an explanatory diagram of a conduit for supplying air to the elastic member;
[Explanation of symbols]
1 Sealing device
2 Timing wheel
3 Bearing part
3a Rotating shaft
4 fixed table
5 Rotating drum
6 Rotating base
7 Ultrasonic wave generation means
8 Horn (first clamping member)
8a Seal facing surface
9 Swing support member
10 Swing part
10a Followers
11 Holding part
13 Elastic member
14 Anvil
14a Seal facing surface
15 Cam member
15a missing part
15b groove
15c Cam groove
21 Supply roll
22 Discharge roll
30 continuous soft workpieces
31 Second sheet
32 First sheet
33 Liquid absorber
35, 36 waistband
37, 38 leg bands
40 Sealing device
50 Swing support member
51 Oscillating part
52 Holding part
53 Drive link
54 Rotating link
56 Drive member
56b Followers
60 Cam member
61 Cam groove
71, 72 Elastic member
75,76 Air pipe
80 Air supply source
81,82 Pressure setting part
84 Switching valve
85 Pressure sensor
86,87 Pressure reducing adjustment valve
OO rotation center line
(I) Supply section
(Ii) Discharge unit

Claims (10)

A rotation unit; a rotation driving unit that rotates the rotation unit; and a plurality of seal mechanisms arranged along a rotation direction of the rotation unit. The soft work is sandwiched between the seal mechanism and the soft work. A first clamping member and a second clamping member that form a seal portion are provided, and the continuous soft workpiece supplied to the seal mechanism is capable of causing the first clamp member to fall within a predetermined range of the circular trajectory of the seal mechanism. In the sealing device in which the seal portion is formed by being sandwiched between the member and the second sandwiching member,
In the sealing mechanism, the first clamping member is positioned on the rotation center side of the rotating portion, and the seal facing surface is directed outward in the normal direction from the rotation center. The second sandwiching member corresponding to the member is disposed on the outer side in the normal line direction than the first sandwiching member, and the second sandwiching member has a seal-opposing surface of the first sandwiching member. Is supported by the rotating portion so as to be able to rotate to a sandwiching position where pressure is applied toward the seal-facing surface and a retracted position away from the first sandwiching member,
When the rotating portion rotates, the second holding member is rotated to the holding position within the predetermined range, and at least the soft work supply portion to the seal mechanism and the soft from the seal mechanism A sealing device characterized in that a swing driving means for rotating the second clamping member to the retracted position is provided at a work discharge portion.   The sealing device according to claim 1, wherein the continuous soft workpiece has at least a weldable sheet.   The continuous soft workpiece includes a liquid absorber disposed at intervals in the supply direction, and a weldable sheet that supports the liquid absorber, and the liquid absorber includes the sealing mechanism. The sealing device according to claim 2, wherein the sheet is sealed in a state where the sheets are overlapped with each other while being positioned between the sealing mechanism and the sealing mechanism.   The rotating part is provided with a rotating drum, and the first clamping member is disposed inside the rotating drum, and a position where the seal facing surface of the first clamping member protrudes from the outer peripheral surface of the rotating drum. The sealing device according to any one of claims 1 to 3.   The seal-opposing surface of the second clamping member when rotated to the retracted position is rotated to an angle of approximately 90 degrees with respect to the rotation center axis of the rotating portion. The sealing device according to 1.   The swing driving means is provided with a cam locus fixed at a position where the rotating portion faces, and when the rotating portion rotates, it moves along the cam locus and holds the second holding member. The sealing device according to claim 1, further comprising a follower that rotates to a position and rotates to the retracted position.   The seal device according to claim 6, wherein the cam trajectory is a continuous cam groove that surrounds the entire circumference of the rotation center of the rotating portion.   The follower is attached to a swing support member that supports the second sandwiching member, and when the follower moves along the cam locus, the swing support member moves to the sandwiching position and the retracted position. The sealing device according to claim 6 or 7, wherein the sealing device is rotated to the right.   A link mechanism is provided between the swing support member that supports the second clamping member and the follower, and when the follower moves along the cam locus, the swing mechanism is interposed via the link mechanism. The sealing device according to claim 6 or 7, wherein the moving support member is rotated to the holding position and the retracted position.   The rotating portion is provided with a swing support member that is swingably supported by the swing shaft, and the second clamping member is supported by the swing support member via an elastic member, 10. When the second clamping member is rotated to the clamping position, the second clamping member is pressurized toward the first clamping member via an elastic force exerted by the elastic member. The sealing apparatus in any one of.

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