CN103284845B

CN103284845B - Sealing device

Info

Publication number: CN103284845B
Application number: CN201310073078.1A
Authority: CN
Inventors: 原正昭; 渡边诚司
Original assignee: SHINKO KIKAI Co Ltd
Current assignee: SHINKO KIKAI Co Ltd
Priority date: 2012-07-31
Filing date: 2013-03-07
Publication date: 2014-08-13
Anticipated expiration: 2033-03-07
Also published as: CN103284845A; JP5089821B1; JP2014028481A

Abstract

The invention provides a sealing device which can be reduced in manufacture cost and easy to maintain. The sealing device is provided with a rotating body which is driven for transporting a workpiece to be sealed; a sealing head which is opposite to the outer periphery of the rotating body across the workpiece to be sealed and simultaneously used for providing the workpiece to be sealed with heat for sealing; a sealing head driving device which enables the sealing head to perform driving path movements towards the forward direction and to perform returning path movements towards the backward direction opposite to the forward direction, with respective to the transporting direction of the workpiece to be sealed; a head contraposition part which can clamp the workpiece to be sealed together with the sealing head and is arranged inside the rotating body in a state of capable of performing driving path movements towards the forward direction and performing returning path movements towards the backward direction, with respective to the transporting direction of the sheet-shaped workpiece; and a head contraposition part driving device which is in linkage with the driving path movements and the returning path movements of the sealing head so as to enable the head contraposition part to perform the driving path movements and the returning path movements and to provide a track of the workpiece to be sealed, which is clamped between the head contraposition part and the sealing head, during the driving path movements. When the sealing head and the head contraposition part perform the driving path movements jointly, the workpiece to be sealed is sealed in the state that the workpiece to be sealed is clamped between the head contraposition part and the sealing head. After the returning path movements are performed by the head contraposition part and the sealing head, identical sealing actions are conducted repeatedly.

Description

Sealing device

Technical field

The present invention relates to the sealing device that sealing has the sealed portion of thermal welding and flexibility.

Background technology

In the past, as the device of the tabs of the synthetic resin such as disposable paper diaper etc. or the fiber that contains synthetic resin and even non-woven fabrics etc. is bonded with each other (sealing), known had a ultrasonic sealing device.

Prior art document

Patent documentation

No. 4297715 communique of patent documentation 1 Japan Patent

In this technology, outer peripheral face at rotor is interval with anvil block (protuberance) with equal angles, with the continuous soft workpiece of the rotational conveyance of rotor, simultaneously, the ultrasonic variable amplitude bar relative with anvil block done round circular arc and moved, by anvil block and ultrasonic variable amplitude bar clamping soft workpiece and when (throughput direction of soft workpiece) is mobile in the same direction, by the heating being formed by ultrasonic vibration, workpiece is carried out to thermal welding (sealing).After sealing, ultrasonic variable amplitude bar returns to home position, and repeats identical action between the anvil block of arrival after the outer peripheral face of rotor.If at fixing for example six anvil blocks of the outer peripheral face rotating, the once rotation ultrasonic variable amplitude bar by rotor carries out round movement six times, collaborates and carries out 6 sealings with anvil block.Like this, owing to coming and going mobile ultrasonic variable amplitude bar, follow soft workpiece certain hour and seal, therefore, compare with fixed ultrasonic variable amplitude bar and have advantages of and can save the sealing time, even in the situation that carrying soft workpiece with high speed, still can obtain sealing quality to a certain degree.

Summary of the invention

Invent problem to be solved

But, require the outer peripheral face that is arranged on a plurality of anvil blocks (protuberance) on rotor outer peripheral face to be positioned at as much as possible on same circumference, if the interval of each anvil block and ultrasonic variable amplitude bar is inhomogeneous, it directly causes sealing the uneven of quality.Therefore, after a plurality of anvil blocks are fixed on to rotor, must carry out high-precision periphery grinding, so that the outer peripheral face of a plurality of anvil blocks is positioned on same circumference.In addition, if in a plurality of anvil blocks one produces damagedly, or will convert the operation of the seal pattern (seal mark style) that changes anvil block time, at the outer peripheral face from rotor, take off all anvil blocks, and after changing a plurality of new anvil blocks, must carry out regrinding to outer peripheral face.Therefore, require a great deal of time and labour, thereby cause expensiveization of device.

Solve scheme and the invention effect of problem

The invention provides a kind of sealing device, it engages the sealed portion of the soft continuous or discontinuous sealed workpiece with thermal welding by heat, it is characterized in that, sealing device is provided with:

Rotor, it is actuated to carry sealed workpiece,

Seal head, it is relative with the outer peripheral face of described rotor by sealed workpiece, meanwhile, sealed workpiece is provided for to the heat of sealing,

Seal head driving device, it makes described seal head exercise towards the positive direction path movement with respect to the conveying of sealed workpiece, and makes seal head carry out return path movement towards the recovery direction contrary with it,

Opposed portion, between itself and above-mentioned seal head, can clamp sealed workpiece, and its inside at above-mentioned rotor is mounted with the state that can carry out the enforcement path movement of forward and restore the return path movement of direction in the conveying with respect to above-mentioned banded workpiece

Opposed portion driving device, make enforcement path movement and the return path movement interlock of described opposed portion and above-mentioned seal head, exercise path movement and return path movement, and in exercising path movement, give and described seal head between clamp the track of sealed workpiece

When path movement is exercised jointly by described seal head and an opposed portion, under clamping the state of sealed workpiece, the two seals, after the return path movement of the two, repeat same sealing action.

In an embodiment, described opposed portion in exercising path movement, give from be formed on space described rotor peripheral part towards described seal head side joint near and together with seal head mobile forward track towards the positive direction, and, in its return path movement, give than described enforcement path locus and more to the central side of described rotor, being offset and mobile recovery direction track.

In an embodiment, for described seal head, the forward track of enforcement path movement and the recovery direction track of return path movement as it are all given along the circular-arc same round track of the outer peripheral face of described rotor, or, at it, exercise in path movement and give along the circular-arc forward track of the outer peripheral face of described rotor, in its return path movement, give towards a lateral deviation at the center than described enforcement path locus further from described rotor and moving and mobile recovery direction track.

According to the present invention, in the situation that continuously sealed workpiece being sealed, at the outer peripheral face of rotor without a plurality of protuberances (anvil block) are set, thereby without for the outer peripheral face of described a plurality of protuberances being formed on the same circular arc with the centres of rotor on the whole and carrying out high accuracy grinding.And, because seal head repeats to exercise the return path movement of path movement mutually linkedly with an opposed portion, when clamping sealed workpiece and making this workpiece mobile together by the two enforcement path movement, seal, therefore, even high speed conveying workpieces, still can guarantee certain sealing time, thereby can improve the reliability of the sealing property while carrying.

Symbol description

1 roller (rotor)

2 anvil blocks (an opposed portion)

3 ultrasonic variable amplitude bars (seal head)

4 ultrasonic wave generators

5 ultrasound unit

10 supports

11 luffing arms

14 connecting portions

15 crank portion

16 motors (seal head driving device)

18 cams

19 cam followers

24 cam surfaces

26,38 sheet-like workpieces (sealed workpiece)

271 the 1st tabs (sealed portion)

28 the 2nd tabs (sealed portion)

29,36 absorbent materials

32 potted lines

33 cut off line

45 anvil block arms

48,62 cam followers

49 connecting portions

50 crank portion

51 motors (an opposed portion driving device)

52 cam paths

55 openings (space)

60 cams

61 cam surfaces

Brief description of drawings

Fig. 1 is the simple front view that shows one embodiment of the present of invention.

Fig. 2 is the side view of one embodiment of the present of invention.

Fig. 3 A is the front view of the component portion of simple displayed map 1 and Fig. 2.

Fig. 3 B is the front view of the variation of displayed map 3A.

Fig. 4 has shown the enforcement of anvil block in Fig. 3 A and the front view of return circulation track.

Fig. 5 is the front view that has shown the driving mechanism of anvil block in Fig. 3 A.

Fig. 6 is the simplified side sectional view of inside of the rotor of the driving mechanism that contains Fig. 5.

Fig. 7 has shown near the front view of the CD-ROM drive motor of anvil block in Fig. 6.

Fig. 8 has shown the axonometric chart that anvil block is exposed to the peristome of rotor externally.

Fig. 9 has shown the part top view that anvil block is exposed to the peristome of rotor externally.

Figure 10 is the front view that has shown the motion of ultrasonic variable amplitude bar and anvil block.

Figure 11 A has shown the surperficial protruding example of anvil block.

Figure 11 B has shown the surperficial protruding example of anvil block.Figure 12 has shown the example 1 of the motion track of ultrasonic variable amplitude bar and anvil block.

Figure 13 has shown the example 2 of the motion track of ultrasonic variable amplitude bar and anvil block.

Figure 14 has shown the variation of the mechanism that makes anvil block circulation.

Figure 15 A is the simple sectional view of mechanism in Figure 14.

Figure 15 B is the simple sectional view of mechanism in Figure 14.

Figure 16 has shown an example of sealed workpiece.

Figure 17 is the top view of sealed workpiece and shows the sealing process that it is carried out and the top view that cuts off operation.

Figure 18 has shown another sheet-like workpiece and for the sealing process of this workpiece and the top view that cuts off operation.

Figure 19 has shown the sealing process being formed by ultrasonic variable amplitude bar and anvil block.

Figure 20 A has shown the example 3 of the motion track of ultrasonic variable amplitude bar and anvil block.

Figure 20 B has shown the example 4 of the motion track of ultrasonic variable amplitude bar and anvil block.

Figure 20 C has shown the example 5 of the motion track of ultrasonic variable amplitude bar and anvil block.

Figure 21 is for to give front view circulation track, corresponding with Fig. 1 by adding cam to ultrasonic variable amplitude bar.

Figure 22 has simply shown the position relationship of Figure 21 central roll and cam.

Figure 23 is the major part side view of Figure 21.

Figure 24 has shown the example 1 that is arranged on the cam on roller.

Figure 25 has shown the example 2 that is arranged on the cam on roller.

Figure 26 has shown the example 3 that is arranged on the cam on roller.

Figure 27 has shown the example 1 of the circulation track of giving ultrasonic variable amplitude bar.

Figure 28 has shown the example 2 of this circulation track.

Figure 29 has shown the example 3 of this circulation track.

Figure 30 has shown the example 4 of this circulation track.

Figure 31 has shown the example 5 of this circulation track.

Figure 32 has shown the example 6 of this circulation track.

Figure 33 has shown the example 7 of this circulation track.

Figure 34 A has shown the hunting range of ultrasonic variable amplitude bar and the position relationship of cam.

Figure 34 B has shown the hunting range of ultrasonic variable amplitude bar and the position relationship of cam.

Figure 34 C has shown the hunting range of ultrasonic variable amplitude bar and the position relationship of cam.

Figure 35 has shown makes the cam part of ultrasonic variable amplitude bar circulation and the example of cam path.

Figure 36 is the front view of travel mechanism that has shown the ultrasonic variable amplitude bar of the cam path that adopts Figure 35.

Figure 37 is the front view that has shown the travel mechanism of the ultrasonic variable amplitude bar in another embodiment.

The specific embodiment

Ultrasonic sealing (joint) device as the sealing device shown in Fig. 1 is provided with: as the roller 1 of rotor, move continuous band shape as sealed workpiece (longitudinally shape) workpiece 26 and it is carried; Ultrasound unit 5, contains the ultrasonic variable amplitude bar 3 relative with the outer peripheral face of roller 1 and ultrasonic wave generator 4.Ultrasonic variable amplitude bar 3 mainly plays the function of seal head.Roller 1, by the turning cylinder 6 of its central part, is supported rotationally by the supporting station 7 on ground plane, and is rotated driving by the motor 8 as rotor driving device.The support 10 that ultrasound unit 5 is arranged on the swingable arm 11 of axle by cardinal extremity is supported swingably, and by support 10, the centrage that ultrasound unit 5 also can be concentric around the center of rotation with roller 1 swings.

On the support 10 of Fig. 1, by connecting portion 14, be connected with crank portion 15.Crank portion 15 is rotated driving by the motor 16 as driving device around central shaft, and by the connecting portion 14 being connected with crank portion 15 bias, makes support 10, arm 11 come and go circular motion (oscillating motion).In addition, the motor 16 of driving crank portion 15 and the motor 8 of driven roller 1 also can not adopt independent motor and use common motor, and the driving of this motor is distributed to roller 1 and crank portion 15, thereby form the synchronous of regulation.

Fig. 2 is the simple side view of Fig. 1, and roller 1 as previously mentioned, is supported in by axle 6 on the supporting station 7 of both sides rotationally, and the base end part of arm 11 is bearing on bearing 11a with respect to axle 6 is swingable (can within the scope of predetermined angular, rotate).Support 10 is parallel to axle 6 extensions with cantilever position from the free end of this arm 10, and, described ultrasound unit 5 is bearing in to its front.

Below, by Fig. 3 A etc., to the ultrasonic variable amplitude bar 3 with respect to as seal head, the anvil block 2 that forms an opposed portion describes.Anvil block 2 and ultrasonic variable amplitude bar 3 between holding workpiece and become the state of pressing, by apply ultrasonic vibration (carrying out heater heating the heated sealant in the situation that) under this clamp position, form the sealing of regulation.

As shown in Figure 11 A, Figure 11 B, on the surface of anvil block 2, for example, form 2 row for forming the projection group 2a of seal pattern, Figure 11 A is the form expanding to a side, and Figure 11 B is parallel form, as described later, on the sheet-like workpiece 26 overlapping, provide its seal pattern, form sealing 32.Sheet-like workpiece 26 is for example as shown in Figure 16, Figure 17, to between the 1st tabs 27 and the 2nd tabs 28, adopt the mode of crossing, folding with the predetermined distance subsides pair formed material doubling of water sucting part 29, this sheet-like workpiece 26 is supplied to roller 1 by the conveying roller 30 of Fig. 1, and sealed by ultrasonic variable amplitude bar 3 and the anvil block 2 of Fig. 3 A etc.At its each 2 potted line 32(Figure 17) between preset and cut off line 33, sheet-like workpiece 26 cuts off line 33 and is cut off and is separated into each goods or intermediate 34(disposable paper diaper etc. by each).This cut-out is the conveying roller 31 by Fig. 1, sheet-like workpiece 26 is delivered to lower procedure (cut-out operation) and carries out.

In addition, form as sheet-like workpiece, can be for example as shown in figure 18, for the sheet-like workpiece 38 that the material doubling that forms betwixt opening 37 under the state of subsides pair water sucting part 36 in tabs 35 is formed, even in this case, still can form two sealing lines 32 that formed by ultrasound wave with the interval of regulation, and its cut-out be formed to each goods or intermediate 39(disposable diaper etc. by cut-out line 33 therebetween).The projection group 2a of Figure 11 A or Figure 11 B is parallel or widen, if potted line 32 differences, but potted line for widening for example can be given inclination at the waist of disposable diaper.In Figure 19, this sheet-like workpiece 26 or 38 is supplied to roller 1, and clamp between the tabs in coincidence status between the projection group 2a of ultrasonic variable amplitude bar 3 and anvil block 2, by the vibrational energy being provided by ultrasonic variable amplitude bar 3, the heat melts tabs that also sealing overlaps of utilizing ultrasonic vibration to produce.

Get back to Fig. 3 A, anvil block 2 is supported by the anvil block arm 45 as pendular body, and outstanding from its leading section, thereby can be relative with ultrasonic variable amplitude bar 3.Anvil block arm 45 be take and is supported swingably as fulcrum with ultrasonic variable amplitude bar 3 swinging axle separated by a distance, and in this example, the turning cylinder 6 of roller 1 doubles as swinging axle.Anvil block arm 45 is connected with crankshaft cheek 50 by connecting portion 49, crank portion 50 is rotated by the motor 51 as driving device, its rotation is passed to anvil block arm 45 by connecting portion 49, thereby make its arm 45 in the angular range of regulation, swing (come and go and rotate), accompany therewith, the anvil block 2 being bearing on its arm 45 also swings with the angular range of regulation.

Anvil block 2 is in longitudinal (leaving and approach the direction of the turning cylinder 6 of roller 1) along arm 45 mode movably, by linear guide part 46, be maintained on arm 45, and, by spring 47 elastomeric elements such as grade, along the direction away from bolster 6, be in other words that the direction of protruding along the periphery from roller 1 is loaded.Anvil block 2 is also provided with the side protrusion of cam follower 48(anvil block 2), this cam follower 48 embeds in the rectangular loop shape cam path 52 shown in Fig. 4, the swing of doing according to the anvil block arm 45 of following the crank portion 50 shown in Fig. 5 to rotate, anvil block 2 moves along cam path 52.

Cam path 52 be provided with exercise path 52A, return path 52B and in both sides, connect the bight that their connecting portion 52C, 52d(is level and smooth or produce dead point and with the kink of acute angle-shaped bending), thereby the whole cam curve that forms circulation.Exercising path 52a forms with the convex curve shape outstanding to roller 1 outside, its curvature can be for example that the circular arc of edge centered by the axis of the turning cylinder 6 of roller 1 forms, and makes it corresponding with the curvature of the circular arc of the round motion track as ultrasonic variable amplitude bar 3 shown in Fig. 3 A.In Fig. 4, the cam curve of return path 52B can be for example outstanding circular-arc laterally with the degree identical with exercising path 52A, or recessed circular-arc or protruding also not recessed linearity neither laterally.The spring 47 of Fig. 3 A, Fig. 5 promotes anvil block 2 laterally, when the loopy moving (swing) of anvil block 2, be difficult to produce and move (rattle), but the quality of fit of the two raising also can not used spring 47 between cam follower 48 and cam path 52.

Cam path 52 is formed on lobe plate 53, and lobe plate 53 directly or by bracket (fixed part), be fixed in the nonrotational portion of roller 1 inside.As simply shown in Fig. 6, the inside of roller 1 forms hollow shape, for example the end of a side is closed and the end of opposite side forms the drum to side opening, and is fixed on turning cylinder 6 by being closed the end of side, and turning cylinder 6 is rotatably supported on supporting station 7 by bearing 6a.Extension 54 stretches to the inner space extension of roller 1 from a supporting station 7 of supporting turning cylinder 6, lobe plate 53 is integrally formed on this extension 54, or, in roughly rectangular with turning cylinder 6 mode, the lobe plate 53 of fixedly split.Extension 54 approaches anvil block arm 45 in the mode along turning cylinder 6, and makes lobe plate 53 relative with the side of anvil block 2, and the cam follower 48 of anvil block 2 is sticked in the cam path 52 of lobe plate 53.

Motor 51, crank portion 50 and connecting portion 49 that anvil block arm 45 is swung are also assemblied in the hollow bulb of roller 1, and motor 51 is arranged on supporting station 7 by fixed station 53.Anvil block arm 45 is bearing in the inside of roller 1 swingably by bearing 45a, thereby can not hinder the rotation of roller 1.The extension 54 stretching out from supporting station 7, lobe plate 53 thereon of supporting, make motor 51 that anvil block arm 45 swings, crank portion 50, connecting portion 49 etc. also be contained in the inside of the roller 1 of hollow form, rotation that can pair roller 1 causes obstacle.

On the periphery cylindrical portion 1a of the roller 1 of hollow cylindrical, form an opening 55(space) or with equal angles interval, form a plurality of (in this example, as shown in Figure 3A, be four) opening 55(space), as shown in Fig. 8～Fig. 9, each opening 55 for example forms with rectangular shape, to there is the length L of regulation along the periphery cylindraceous of roller 1, and, the large width W of depth size than anvil block 2 (with the size of the axially parallel of roller 1) there is.Anvil block 2 can be given prominence to laterally or expose from these openings 55, and, by cam follower 48, at anvil block 2 from the connecting portion 52c of the starting point of the cam path 52 of pie graph 4 grades along exercising the process (enforcement path locus) that path 52a moves, anvil block 2 is with from the mode outstanding and even that expose rise (promoting or floating) upward of opening 55 arbitrarily, in the process moving along connecting portion 52d and the return path 52b of cam path 52 at anvil block 2, the mode that anvil block 2 is introduced with the inside from opening 55 to roller 1 declines, under the state of dodging to inside from the periphery of roller 1, come and go mobile.

As shown in figure 10, enforcement path movement in enforcement path movement in the swing of anvil block 2 (shuttling movement) and the swing of ultrasonic variable amplitude bar 3 (coming and going circular motion) is circular-arc interlock with its motion track, on the other hand, the return path movement of the two departs from mutually (with respect to the ultrasonic variable amplitude bar 3 that comes and goes merely circular arc and move, anvil block 2 departs to the inside) to return to home position under the state of dodging, repeat afterwards this circulation.This cycle period of week is to rotate to be wrapped under the state of on roller 1, it being carried and realize at the workpiece 26 while making lamellar at roller 1.

In Fig. 3 A, in the rotation of roller 1, at any opening 55 of roller 1, approach the wobble area moment of anvil block 2, produce the swing (with the rotation of the rotation direction equidirectional of Fig. 3 A central roll 1) in the enforcement path of anvil block arm 45, by cam path 52 anvil blocks 2, from opening 55, towards outside, float, sheet-like workpiece 26 is clamped between itself and ultrasonic variable amplitude bar 3, simultaneously, at the opening 55 of anvil block 2 and ultrasonic variable amplitude bar 3, roller 1 and workpiece 26 jointly when exercising direction and move, the sealing of carrying out being realized by ultrasound wave (by the generate heat welding of realization of vibration).After sealing, at anvil block arm 45 from exercising the process of swing in the return path of route turning, by cam path 52, anvil block 2 enters from its opening 55, and, make not exist on roller 1 the interior side direction of the periphery cylindrical portion 1a of opening 55 swing (retreating) and make it return to home position in the mode of the direction of rotation with roller 1.

And then, while approaching the next opening 55 on roller 1, in the same manner as described above, produce the swing in the enforcement path of anvil block arm 45, repeat afterwards following identical motion, in a plurality of sealing reservations that are positioned at equal intervals on workpiece 26, the swing (coming and going mobile) by ultrasonic variable amplitude bar 3 with the mutual same period of anvil block 2, holding workpiece 26 is to seal in order.Herein, ultrasonic variable amplitude bar 3 with anvil block towards exercising in the process of direction interlock, can extend the sealing time, thereby even if when the high speed of workpiece 26 is carried, still can guarantee the reliability of sealing.In addition, because being not is fixed on the outer peripheral face of roller 1 by a plurality of anvil blocks 2 with the interval equating, and adopted for roller 1, for example an anvil block 2 swings the structure that can realize whole sealings, therefore, the gap adjustment control of guaranteeing to seal the necessary anvil block 2 of quality uniformity and ultrasonic variable amplitude bar 3 can be easily realized, thereby the deviation of sealing property can be easy to avoid for a plurality of sealings.

As mentioned above, in order to make roller 1, anvil block 2 and the mutual co-operating of ultrasonic variable amplitude bar 3, need the rotation phase of roller 1 to synchronize with the hunting period of anvil block arm 45 and luffing arm 11.This control is to be made motor 8 that roller 1 rotates, make the motor 51 that anvil block arm 45 swings and the control part 57 of the motor 16 that luffing arm 11 swings is carried out by interrelated control.

In addition, the outer peripheral face of anvil block 2 can be for example along the circular arc centered by the centrage of roller 1, to form, and the projection group 2a shown in Figure 11 A, Figure 11 B is outstanding from this circular-arc outer peripheral face.In this case, the circular-arc outer surface of anvil block 2 forms along the mobile circular arc of ultrasonic variable amplitude bar 3.And the round circular motion medium velocity of ultrasonic variable amplitude bar 3 is in sine curve mode, cardinal extremity slow (or being 0), fast in centre, terminal slow (or being 0).In addition, the anvil block 2 that circulation swings also forms the non-movement at the uniform velocity approximate with ultrasonic variable amplitude bar 3.Because the translational speed of these anvil blocks 2 and ultrasonic variable amplitude bar 3 is almost similar to, therefore, relatively moving between the two reaches negligible degree, but, for the roller 1(opening 55 moving at the uniform velocity) and workpiece 26,3 of anvil block 2 and ultrasonic variable amplitude bars relatively move in hunting range.In a word, anvil block 2 relatively moves along its length in opening 55, in addition, ultrasonic variable amplitude bar 3 along the surface of workpiece 26 with to a certain degree move and anvil block 2 with when to a certain degree moving along the back side of workpiece 26, workpiece pressing 26 on two groups of projection group 2a and engage (sealing).

Although in Fig. 3 A, make ultrasonic variable amplitude bar 3(luffing arm 11) driving device (connecting portion 14, crank portion 15, motor 16) that swings and make anvil block 2(anvil block arm 45) driving device (connecting portion 49, crank portion 50, motor 51) of swing arranges respectively, but, also can adopt and make luffing arm 11 and anvil block arm 45 one swing and they are arranged to shared (independent) pendulous device (driving device).For example, as shown in Figure 3 B, omitted the driving device that anvil block arm 45 is swung, the driving device that luffing arm 11 is swung is only set, or, can omit the driving device that in Fig. 3 A, anvil block arm 11 is swung, the driving device that anvil block arm 45 is swung is only set, luffing arm 11 and anvil block arm 45 one are swung.In a word, adopt (one) driving device sharing that is also used as the seal head driving device of ultrasonic variable amplitude bar 3 and an opposed driving device of anvil block 2.Like this, can realize simply the swing of two arms 11 and 45, and the swing of ultrasonic variable amplitude bar 3 and anvil block 2 is synchronous.

Although the example providing is in the above description: as shown in figure 12, anvil block 2 is by the oscillating motion that circulates of anvil block arm 45 and cam path 52, in addition, ultrasonic variable amplitude bar 3 comes and goes circular motion by luffing arm 11, by carry out holding workpiece 26 in conjunction with these, and, in the enforcement path movement of the two, seal, but, as shown in figure 13, also can be that radiant body 3 is simple round circular motion, on the other hand, anvil block 2 is circulation track, swinging two ends is not round and smooth track, but give the acute angle-shaped track of turning back a little that has at the generation dead point, two ends swinging to anvil block 2.

For anvil block 2 being given to the motion of Figure 13, replace foregoing cam path 52, as shown in figure 14, at the inner surface of the periphery cylindrical portion 1a of roller 1, block cam 60 is set, the cam surface 61 consisting of its downward limit part is relative with the cam follower 62 being arranged on the side of anvil block 2.Anvil block 2 is assemblied in the leading section of anvil block arm 11, and the direction of protruding along the periphery from roller 1 is loaded by elastomeric elements such as springs 47, when cam 60 passes through anvil block 2, cam surface 61a is in advance by cam follower 62, overcome the additional force of spring 47, with the direction of dodging to inside from the periphery of roller 1, press down anvil block 2.

In this example, cam 60 is for example, with quantity (four) corresponding with the quantity that is formed on the opening 55 on roller 1, on the circumference of roller 1, with equal angles interval and at its circumferencial direction, between each opening 55 or in overlap with the position of each opening 55 mode of (overlapping) of a part, arrange.The form that the cam surface 61 of cam 60 adopts is: if from the inner surface of the periphery cylindrical portion 1a of roller 1 inwardly the overhang of (direction approaching with the centrage of roller 1) reach the height of cam, a side (61a) cam height at cam surface 61 increases gradually, not too large variation of pars intermedia (61b), reduces gradually at opposite side (61c).

The swing that starts to exercise path at anvil block 2 by arm 11 with opening 55 mutually in the face of time, the cam follower 62 of anvil block 2 be positioned at cam 60 cam surface 61c near, if while there is not part corresponding to cam 60 in the cam follower 62 of anvil block 2, anvil block 2 is released by spring 47 and is protruded from the opening 55 of the roller 1 that rotates, and ultrasonic variable amplitude bar 3 between under the state of holding workpiece 26, towards exercising direction, move together with the opening 55 of horn 3, roller 1 and workpiece 26, by ultrasound wave, seal through the stipulated time in this enforcement campaign.

After sealing, when anvil block 2 transfers the motion in return path to by arm 45, the cam 60 of the rear row of the roller 1 rotating reaches anvil block 2, the cam surface 61A of side overcomes the spring force of spring 47 and presses down the cam follower 62 of anvil block 2 in advance, thereby anvil block 2 is dodged in the mode entering from opening 55, anvil block 2 pierces the inner side of the periphery cylindrical portion 1a of roller 1, with roller 1 backswing (return motion).When anvil block 2 transfers enforcement motion to from its return motion, cam follower 62 is positioned near the of cam surface 61C and departs from cam 60, so that the next opening 5 arriving exposes from the roller 1 rotating, and is released by spring 47, repeat afterwards action same as described above.In Figure 15 A, when the cam follower 62 of anvil block 2 departs from cam 60, by the inner peripheral surface 63 of the cam follower 62 of anvil block 2 and the periphery cylindrical portion 1a of roller 1 is contacted, can limit the bulge quantity of anvil block 2, as shown in Figure 15 B, the opposed portion 65 of retainer that makes to be arranged on anvil block 2 contacts with the retainer 64 being formed on anvil block arm 45, can limit the overhang of anvil block 2.In addition, also a plurality of cams 60 in this figure can be replaced by with a circular continuous cam link.

Above, as shown in figure 13, although provided, make anvil block 2 and the synchronous example swinging of ultrasonic variable amplitude bar 3, but, as shown in Figure 20 A～20C, anvil block 2 forms the motion track of Figure 12 or Figure 13, on the other hand, ultrasonic variable amplitude bar 3 is not to come and go arc track, exercise the simple circular motion of path for being formed by arm 11, but for return path, can give than exercising the return path of path further from the outer peripheral face of roller 1 radiant body 3, therefore, in the return path of horn 3, can eliminate or alleviate horn 3 contacts (interference) and abrades its surperficial situation with workpiece 26, thereby effectively avoid being waited by its scratch the reduction of the commodity value causing.

An example of the mechanism of the enforcement path described in ultrasonic variable amplitude bar 3 is given and the track in return path describes.In Figure 21, can approach remotely and support ultrasound unit 5 by support 10 with respect to the outer peripheral face of roller 1, in this example, by linear guide (linear bearing) 12, ultrasound unit 5 is slided in prescribed limit with respect to support 10.

By being arranged on the retainer 13 on support 10, restriction ultrasound unit 5 approaches roller 1(and for example declines) movement of direction, thus stop more than ultrasonic variable amplitude bar 3 moves to prescribed limit to roller 1.Support 10 is connected with crank portion 15 by described connecting portion 14, and, by the motor 16 as its driving device, make support 10, arm 11 come and go circular motion (swing).

A plurality of cams 18 are given prominence to the periphery that is arranged on roller 1 (also referring to Figure 22) from the periphery of roller 1, and the cam follower 19 relative with these cams 18 is set in ultrasound unit 5.Cam follower 19 is followed the rotation of roller 1, rests against on each cam 18 and crosses this cam, follows thus the cam curve lifting of each cam 18 along the direction of the approaching periphery away from roller 1.

Figure 23 is for showing near enlarged side view ultrasound unit 5, and cam 18 is fixed on the end face of roller 1 and cam surface stretches out from the periphery of this roller 1, thereby can contact with cam follower 19.Cam follower 19 is arranged on from the side of ultrasonic variable amplitude bar 3 towards the position extending laterally by bracket 20, so as not and the tabs in overlap condition (workpiece) being clamped between ultrasonic variable amplitude bar 3 and anvil block 2 produce interference.

At cam follower 19, rest against under the state on cam 18, in Figure 23, ultrasound unit 5 upwards rises, and forms the opposed portion 21 of retainer that is arranged in ultrasound unit 5 state separated with being arranged on described retainer 13 on support 10.Cam follower 19 cross cam 18 and with arrive next cam 18 before blank portion at once, because ultrasound unit 5 is not subject to the constraint of cam 18, therefore, it declines in Figure 23, but its Limitation Of Movement is limited because of the described retainer 13 that 21 contacts of the opposed portion of the retainer of ultrasound unit 5 are arranged on support 10.In one or two that can be in this retainer 13 and the opposed portion 21 of retainer, the elastomeric elements such as rubber are set, impact or abnormal sound in the time of can alleviating thus contact.

Figure 24 has shown an example of cam 18, and its formation is tabular, forms cam surface 24, and be fixed on the end face of roller 1 by bolt hole 25 and the not shown clamp devices such as bolt in its outer rim.Cam surface 24 in this example is from the outer peripheral face protrusion of roller 1 and the cam follower of described ultrasound unit 5 sides 19 these cam surfaces 24 of contact, the trapezoidal shape that this cam surface global approximation is flat, and, its right side from figure rises (inclined cam surface 24a), substantial transverse extension afterwards (top cam surface 24b), declines thereafter (inclined cam surface 24c).Although top cam surface 24 can form with linearity (Figure 25), can form with the outside to anvil block roller 1 circular-arc the formation (Figure 26) of convex, but in this example, it has formed the less arc-shaped surface (Figure 24) of curvature that forms concavity with respect to the outside of anvil block roller 1.

Cam follower 19 is moved by arm 11 along the periphery circular arc of roller 1, corresponding therewith, and top cam surface 24b forms concavity, and thus as hereinafter described, the track of cam follower 19 forms roughly linearity.In addition, inclined cam surface 24a, 24c can be also linearity or protrude laterally, or form to form oppositely recessed mode, in this example, provided and formed with respect to roller 1 example of recessed curve slowly.The movement of giving by 18 pairs of cam followers 19 of described cam and circular motion synthetic of giving cam follower 19 by the arm 11 swinging, as shown in figure 27, can give cam follower 19(and ultrasonic variable amplitude bar 3) motion track, give the forward track A of the circular arc of edge, right side centered by the centrage of roller 1 from figure and the recovery direction track B restoring to home position after this forward track A, the coupling part of forward track A and recovery direction track B forms to be had compared with the bight of roundlet arcuation, in addition, the more than half part or the mid portion that restore direction track B form linearity track, its both sides form skewed track.

Example shown in Figure 28 is: forward track A is identical with Figure 27, restores direction track B1 and accounts for more than half part with straight line portion, and bending part forms larger circular-arc bight.In Figure 29, forward track A, in its end bending,, afterwards, rises and arrives linearity part with a certain amount of recovery along same circular arc, and, decline to forming and divide the recovery direction track being connected B2 with circular-arc part.In this example, at the two ends of forward track A, it is zero dead point that the motion of cam follower (ultrasonic variable amplitude bar) produces instantaneous.In any track shown in Figure 27 to Figure 29, what is called must be take forward and restore the implication of direction by other track and can move with circulation track as ultrasonic variable amplitude bar.

In addition, as shown in FIG. 30 to 33, also can form the recovery direction track B3～B6 with the arc form of its convex bloating equally laterally with respect to forward track A.In this case, can form and make the top cam surface 24b of Figure 24 form linearity (Figure 25) or form circular-arc (Figure 26) of the mitigation of protrusion laterally.

Two end P1, P2 of round arc track and the relative position relation of cam 18 of the ultrasonic variable amplitude bar 3 being provided by swing arm 11 has been provided for Figure 34 A, 34B, 34C.For example, as shown in Figure 34 C, before ultrasonic variable amplitude bar 3 arrives swinging end P2, in the situation that the C1 of end in advance of cam 18 surpasses cam follower 19, when radiant body 3 arrives its mobile terminal P2, the C1 of end in advance of cam 18 enters the outside (side of another swinging end of principle P1) (in advance surpass) of the hunting range of radiant body 3, before cam follower 19 arrives swinging end P2, rests against on cam 18 and horn 3 starts to leave the outer peripheral face of anvil block roller 1.In this case, radiant body 3 is given the circulation track of Figure 27～28 or Figure 30～Figure 31.As shown in Figure 34 B, before horn 3 arrives swinging end P2, in the situation that the C1 of end in advance of cam 18 does not catch up with cam follower 19, with respect to its swinging end P2, the C1 of end in advance of cam 18 is positioned at the inner side (approaching the forward side of swinging end P1) (going afterwards) of hunting range, ultrasonic variable amplitude bar 3 arrives P2 and turns back at this from P1, in returning to the way of P1, rest against on cam 18, horn 3 starts to leave the outer peripheral face of anvil block roller 1, therefore, in this case, to ultrasonic variable amplitude bar 3, give Figure 29, circulation track as shown in Figure 32.In addition, as shown in Figure 34 A, in the situation that the mobile terminal P2 of ultrasonic variable amplitude bar 3 arrives with the C1 of end in advance of cam 18 the consistent same period, form circulation track as shown in Figure 33.As mentioned above, according to the C1 of end in advance of cam 18, whether to enter the mode in radiant body swinging end P2 outside, reach and exceed (+y) and still stop at inner side (forward) (y), determine thus the trajectory shape of the return portion of the recovery direction track B being connected with forward track A.

The forward process of ultrasonic variable amplitude bar 3 is given by luffing arm 11, and Recovery Process is given by the cam 18 being fixed on anvil block roller 1, in addition, also can adopt other method form.As an example, as shown in figure 35, fixing cam part 40 is set, forms the cam path 41 corresponding with the circulation track that ultrasonic variable amplitude bar 3 is given on this cam part 40, the cam follower 42 of ultrasonic variable amplitude bar 3 sides is sticked in this cam path 41.And, as shown in figure 36, if by the rotation of crank portion 15 in support 10, by connecting portion 14, ultrasound unit 5 is swung, cam follower 42, along its cam path 41 shuttling movements, is directly given motion track to ultrasonic variable amplitude bar 3 thus.The track being formed by this cam path 41 can form the track corresponding with Figure 27～Figure 33 etc.In the example of Figure 35, the recovery direction track B that give circular-arc forward track A along the outer peripheral face of roller 1, is divided into main body with coupled linearity part or circular-arc part, and the bight of round and smooth connection between them or with the kink of acute angle bending.

By bent axle 15 grades, make luffing arm 11 swing this prerequisite also not necessarily necessary.For example, as shown in figure 37, support 10 by be arranged on linearity on fixed part or circular-arc other fixedly guide member 43 can come and go and mobilely support (slip), on this support 10, can approach and support discretely ultrasound unit 5 with respect to the outer peripheral face of roller 1, support 10 comes and goes mobile by bent axle 15.If as prerequisite, without luffing arm 11.And the cam follower 42 of ultrasound unit 5 sides is sticked in the cam path 41 on stationary cam parts 40 that is formed on shown in Figure 35.

Although above several embodiment are illustrated,, the present invention is not made an explanation by above-mentioned record content constraints, in the situation that not departing from inventive concept, can make various distortion.For example, although as above seal head, provided the example of ultrasonic variable amplitude bar,, also can apply the present invention to heat by heater the heat seal device that sealed portion is carried out to thermal welding.

Claims

1. sealing device, it carrys out the sealed workpiece of joint continuity band shape the 1st soft tabs and the 2nd tabs with thermal welding by heat, is characterized in that, sealing device is provided with:

Rotor, it is actuated to carry sealed workpiece,

Opposed portion, sealed workpiece can be held between described opposed portion and described seal head, and described opposed portion is mounted with the state that can carry out the enforcement path movement of forward and restore the return path movement of direction in the conveying with respect to described sealed workpiece in the inside of described rotor

Opposed portion driving device, it makes enforcement path movement and the return path movement interlock of described opposed portion and described seal head, exercise path movement and return path movement, and in the enforcement path movement in described enforcement path movement and return path movement, give by sealed piece-holder the enforcement path locus between described opposed portion and described seal head

2. sealing device according to claim 1, be further characterized in that: described opposed portion its exercise in path movement, give from be formed on space described rotor peripheral part towards described seal head side joint near and together with seal head mobile forward track towards the positive direction, and, in its return path movement, give the recovery direction track more moving to the central side skew of described rotor than described enforcement path locus.

3. sealing device according to claim 1 and 2, be further characterized in that: for described seal head, as exercising the forward track of path movement and the recovery direction track of return path movement, be all endowed along the circular-arc same round track of the outer peripheral face of described rotor.

4. sealing device according to claim 1 and 2, be further characterized in that: described seal head is exercised in path movement and given along the circular-arc forward track of the outer peripheral face of described rotor at it, in its return path movement, give towards a lateral deviation at the center than described enforcement path locus further from described rotor and moving and mobile recovery direction track.