JP2013216023A - Ultrasonic bonding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic bonding hardly causing such a product defect that the surface of a sheet is damaged by a scratch or a commercial value is lowered.SOLUTION: A device in which a first sheet and a second sheet both having flexibility and thermally adhesiveness are placed on each other and bonded by an ultrasonic wave is provided with: an ultrasonic horn corresponding to the first sheet and the second sheet that are placed on each other; a rotary body for transporting the first and second sheets and holding both the sheets between the ultrasonic horn and the rotary body; and an ultrasonic horn transportation device for moving the ultrasonic horn along a circuit track including a forward direction track linked with the round track of the rotary body and a returning direction track continuing to the end of the forward direction track and returning to a starting point side of the forward direction track while being separated from the round track of the rotary body. In the forward direction track of the ultrasonic horn, the first and second sheets are bonded to each other by the ultrasonic wave while holding the sheets in cooperation with the rotary body.

Description

  The present invention relates to an ultrasonic bonding apparatus for bonding by ultrasonic waves in a state where first and second sheet portions having flexibility and heat-welding properties are overlapped.

  2. Description of the Related Art Conventionally, an ultrasonic sealing device is known as a member for joining (sealing) sheets of synthetic resin such as disposable paper diapers or fibers or nonwoven fabrics containing synthetic resin.

Japanese Patent No. 4297715

  This technology uses ultrasonic reciprocation to swing the ultrasonic horn along the outer peripheral surface of the sheet conveying rotator. The same arc motion is repeated, and there is an advantage that the ultrasonic horn can increase the sealing time compared with the fixed type.

  However, there is a risk that the surface of the sheet will be rubbed and damaged or the value of the product may be reduced when returning with an arc locus. The present invention has been made to solve the above-described problems.

Means for Solving the Problems and Effects of the Invention

The present invention is an apparatus for joining by ultrasonic waves in a state where the first sheet portion and the second sheet portion having flexibility and heat-welding property are overlapped,
An ultrasonic horn facing the first sheet portion and the second sheet portion in a stacked state;
A rotary body that conveys the first and second sheet portions and sandwiches both the sheet portions with the ultrasonic horn, and
Returning the ultrasonic horn toward the start point side of the forward trajectory while being separated from the rotational trajectory of the rotating body following the end of the forward trajectory corresponding to the rotating trajectory of the rotating body and the end of the forward trajectory. An ultrasonic horn moving device that moves along a circular trajectory including a direction trajectory,
In the forward trajectory of the ultrasonic horn, the first and second sheet portions are joined by ultrasonic waves while being sandwiched in cooperation with the rotating body.

  Thereby, as conceptually shown in FIG. 1 and FIG. 2, the ultrasonic horn facing the rotating body that conveys the overlapped sheet portions is sealed with a forward trajectory corresponding to the rotating trajectory of the rotating body. And a return direction trajectory that returns to the original while being separated from the rotating body is provided following the forward direction trajectory. Unlike the conventional reciprocating arc trajectory shown in FIG. Inconveniences such as rubbing the surface are less likely to occur.

  In addition, as shown in FIG. 2, it is possible to prevent the return dead points d1 and d2 that always occur in the prior art shown in FIG. 4 when approaching / separating from the rotating body. It becomes easier to move the horn more smoothly.

  As an embodiment, a plurality of convex portions projecting toward the ultrasonic horn at predetermined intervals are provided on the outer peripheral surface of the rotating body, the forward trajectory corresponding to the rotational trajectory of the convex portion, and the convex portion The ultrasonic horn moving device moves the ultrasonic horn along the circular trajectory including a return trajectory returning to the start end side of the forward trajectory while being separated from the rotation trajectory, and the forward trajectory of the ultrasonic horn The first and second sheet portions are joined by ultrasonic waves while being held in cooperation with the convex portions of the rotating body.

  By sandwiching the sheet portion overlapped between such a convex part (so-called anvil) and the ultrasonic horn, the ultrasonic vibration of the ultrasonic horn is intensively transmitted to the seal location, and a good seal can be obtained even in a short time. it can.

As an embodiment, the return direction trajectory includes a linear trajectory or an arc-shaped trajectory that is convex in a direction away from the outer peripheral surface of the rotating body.
As the number of linear trajectory portions increases, the ultrasonic horn returns to the original position at a short distance and can be prepared for the next seal, and the circularity is improved by including the arc-shaped trajectory.

  As an embodiment, the ultrasonic horn is moved toward and away from the outer periphery of the rotating body by a swinging mechanism on a support section that swings around an axis concentric with the rotation center of the rotating body in the forward path and the return path. On the other hand, on the outer periphery of the rotating body, the ultrasonic horn is separated from the outer periphery of the rotating body according to the relative movement between the rotation of the rotating body and the backward movement of the swing mechanism. A cam to be approached again is provided, the forward trajectory of the ultrasonic horn is given by the forward movement of the rocking mechanism, and the return direction trajectory is given by a combination of the backward movement of the rocking mechanism and the cam. .

  The movement trajectory of the ultrasonic horn can be given by, for example, a circulating cam groove, but the forward trajectory of the ultrasonic horn is given by, for example, an arc trajectory by the reciprocating arc motion of the arm, and the return direction trajectory is applied to the rotating body. If the ultrasonic horn is moved away from the rotating body by the provided cam, the forward trajectory and the return trajectory can be given to the ultrasonic horn with a simpler configuration.

The figure which shows this invention notionally. The figure explaining the circulation locus | trajectory of the ultrasonic horn illustratively. The figure explaining the surrounding surface locus | trajectory of the ultrasonic horn of a prior art example. The figure explaining the turning dead center with the conventional ultrasonic horn locus | trajectory. The front view which shows simply one Example of this invention. The figure which shows simply the positional relationship of the anvil and cam in FIG. 5A. The side view of FIG. 5A. The figure which shows Example 1 of the cam attached to the anvil roll. The figure which shows Example 2 of the cam attached to the anvil roll. The figure which shows Example 3 of the cam attached to the anvil roll. The figure which shows Example 1 of the cyclic locus provided to an ultrasonic horn. The figure which shows Example 2 of a cyclic locus. The figure which shows another example 3 of a cyclic locus. The figure which shows Example 4 of a cyclic locus. The figure which shows Example 5 of a cyclic locus. The figure which shows the example 6 of a cyclic locus. The figure which shows Example 7 of a cyclic locus. The figure which shows the positional relationship of the rocking | fluctuation range of an ultrasonic horn, and a cam. The figure which shows the example of the protrusion of the surface of an anvil. The figure which shows an example of a sheet-like workpiece. The figure which shows the top view of a sheet-like workpiece | work, the sealing process provided to it, and a cutting process. The top view which shows another sheet-like workpiece | work, the sealing process with respect to the workpiece | work, and a cutting process. The figure which shows the sealing process by an ultrasonic horn and an anvil. The figure which shows the cam member and cam groove in another Example. The front view which shows the moving mechanism of the ultrasonic horn using the cam groove of FIG. The front view which shows the moving mechanism of the ultrasonic horn in another Example.

  An ultrasonic bonding (seal) apparatus shown in FIG. 5A includes an anvil roll 1 as a rotating body having an anvil 2 as a convex portion on the outer peripheral surface, an ultrasonic horn 3 and an ultrasonic wave facing the outer peripheral surface of the anvil roll 1. And an ultrasonic unit 5 including the generator 4. The anvil roll 1 is rotatably supported by a support 7 on the ground surface by a rotation shaft 6 at the center thereof, and is driven to rotate by a motor 8 as a rotating body driving device. The ultrasonic unit 5 is supported so as to be swingable by a support portion 10 attached to an arm 11 whose base end can swing around one axis. In this example, the arm 11 is supported by a support 7 so as to be swingable by a shaft (bearing) 6 b (FIG. 6) concentric with the rotating shaft 6 of the anvil roll 1, and the ultrasonic unit 5 is also supported via the support portion 10. It swings around a center line concentric with the center of rotation of the anvil roll 1.

  The ultrasonic unit 5 is supported by the support portion 10 so as to be able to approach and separate from the outer peripheral surface of the anvil roll 1, and in this example, a linear guide (linear bearing) 12 holds the ultrasonic unit 5 with respect to the support portion 10 within a predetermined range. Slide with.

  The movement of the ultrasonic unit 5 in the direction approaching (for example, descending) the anvil roll 1 is regulated by a stopper 13 provided in the support unit 10, and the movement of the ultrasonic horn 3 beyond a certain limit toward the anvil roll 1 is performed. Be blocked. A crank portion 15 is connected to the support portion 10 via a connecting portion 14. The crank portion 15 is rotationally driven around a central axis by a motor 16 as a crank driving device, and the support portion 10 and the arm 11 are reciprocated in a circular arc motion (pendulum motion) via a connecting portion 14 that is eccentrically connected to the crank portion 15. Let

  The motor 16 that drives the crank portion 15 and the motor 8 that drives the anvil roll 1 are not separate motors, but a common motor is used, and the drive of this motor is distributed to the anvil roll 1 and the crank portion 15. It is also possible to take a predetermined synchronization.

  A plurality (four in this example) of anvils 2 are provided at predetermined equal intervals so as to protrude from the outer periphery of the anvil roll 1. Corresponding to these anvils 2, a plurality of cams 18 (four in this example) are provided on the outer periphery of the anvil roll 1 so as to protrude from the outer periphery of the anvil roll 1. As schematically shown in FIG. 5B, the cam 18 does not interfere with the anvil 2 with respect to the anvil 2 fixed to the outer periphery of the anvil roll 1, and occupies a position overlapping (stacked) with the anvil 2 in a front view, Conceptually, the cam 18 is in front and the anvil is positioned behind it. The ultrasonic unit 5 is provided with a cam follower 19 for these cams 18. The cam follower 19 moves up and down on each cam 18 as the anvil roll 1 rotates, and ascends and descends according to the cam curve of each cam 18 in the direction approaching and separating from the outer periphery of the anvil roll 1 with respect to the support portion 10.

  FIG. 6 is a simplified side view of FIG. 5. As described above, the anvil roll 1 is rotatably supported by the abutments 7 on both sides via the shafts 6, and the base end of the arm 10 is mounted on one of the abutments 7. The portion is supported by the bearing 6b so as to be swingable (rotatable within a predetermined angle range). From the free end portion of the arm 10, the support portion 10 extends in a cantilever state in parallel with the shaft 6, and the above-described ultrasonic unit 5 is supported on the distal end side thereof. The anvil 2 of the anvil roll 1 and the cam 18 do not interfere with each other. That is, the anvil 2 protrudes from one side of the outer peripheral surface of the anvil roll 1, and the cam 18 is fixed to the end surface of the roll 1 so that the cam surface protrudes from the outer periphery of the roll and can come into contact with the cam follower 19. The cam follower 19 is provided at a position protruding laterally from the side surface of the ultrasonic horn 3 via the bracket 20. The cam follower 19 does not interfere with the overlapped sheet portion sandwiched between the head portion of the ultrasonic horn 3 and the anvil 2.

  In a state where the cam follower 19 rides on the cam 18, the ultrasonic unit 5 rises upward in FIG. 6, and the stopper facing portion 21 provided in the ultrasonic unit 5 is from the above-described stopper 13 provided in the support portion 10. It is in a separated state. When the cam follower 19 gets over the cam 18 and corresponds to the blank portion up to the next cam 18, the ultrasonic unit 5 does not receive the restraint of the cam 18, so that the cam unit 19 is lowered in FIG. 6. When the stopper facing portion 21 of the ultrasonic unit 5 comes into contact with the stopper 13 provided at the position of the ultrasonic unit 5, it is regulated. One or both of the stopper 13 and the stopper facing portion 21 can be provided with an elastic member such as rubber, thereby reducing impact and noise during contact.

  It should be noted that the stacked sheet portions as workpieces (workpieces) to be described later are heated inside by ultrasonic waves and bonded (sealed) by solidifying after heat melting. It is clamped between the horn 1 and the anvil 2. When adjusting the pressure (seal pressure) or when handling the sheet portion as a workpiece, when the anvil 2 is separated from the ultrasonic unit 5, the central axis 6 of the anvil roll 1 is moved up and down. For this purpose, an elevating cylinder 22 is provided close to the abutment 7, and the anvil roll 1 is moved toward and away from the ultrasonic unit 5 through the bearing portion 23 of the shaft 6 by its operation.

  7A to 7C show an example of the cam 18, which has a plate shape, has a cam surface 24 formed on the outer edge thereof, and is fixed to the end surface of the anvil roll 1 by fastening means such as a bolt hole and a bolt (not shown). ing. The cam surface 24 in this example protrudes from the outer peripheral surface of the anvil roll 1 and comes into contact with the cam follower 19 on the ultrasonic unit 5 side as described above. However, the cam surface 24 as a whole resembles a flat trapezoidal shape. (Inclined cam surface 24a), then extends substantially laterally (top cam surface 24b), and then descends (inclined cam surface 24c). The top cam surface 24b may be formed linearly or may be formed by an arcuate surface that is convex toward the outside of the anvil roll 1, but in this example, it is slightly concave toward the outside of the anvil roll 1. An arcuate curved surface with a small curvature.

  The cam follower 19 is moved by the arm 11 along the outer peripheral arc of the anvil roll 1 and the top cam surface 24b is formed in a concave shape, so that the locus of the cam follower 19 is substantially linear as will be described later. become. In addition, the inclined cam surfaces 24a and 24c can also be formed to be linear, convex outward, or concave in the opposite direction, and in this example, an example of a curved curve that is loosely concave with respect to the anvil roll 1 is shown. Has been. As shown in FIG. 8, the movement of the cam follower 19 (and thus the ultrasonic horn 3) is obtained by combining the movement given to the cam follower 19 from the cam 18 and the arc motion given to the cam follower 19 by the swinging arm 11. A trajectory is provided, and a forward trajectory A along a circular arc centered on the center of the anvil roll 1 from the right in the figure, and a return trajectory B that returns to the original position following this forward trajectory A are provided, The connecting portion between the forward trajectory A and the return trajectory B can be an arcuate corner portion, the majority or middle portion of the return trajectory B is a linear trajectory, and both sides are inclined trajectories. It can be.

  FIG. 9 shows an example in which the forward trajectory A is the same as that in FIG. 8, the return direction trajectory B1 occupies most of the straight portion, and the folded portion becomes a relatively large arcuate corner portion. FIG. 10 shows a return direction trajectory B2 in which the forward trajectory A is turned back at its end, and after returning by a certain amount along the same arc, it rises to reach a linear portion and descends to connect to the arc portion. The In this example, a dead point at which the movement of the cam follower (ultrasonic horn) instantaneously becomes zero at both ends of the forward trajectory A is generated. In any of the trajectories shown in FIGS. 8 to 10, it can be said that the ultrasonic horn moves along a circular trajectory in the sense that the trajectory always passes through different trajectories in the forward direction and the return direction.

  Further, as shown in FIG. 11A, a return direction trajectory B3 having an arcuate shape that bulges outward (becomes convex) with respect to the forward trajectory A can also be used. In this case, as shown in FIGS. 7B and 7C, the top cam surface 24b may be linear or a loose arc that protrudes outward. Further, in FIG. 11B, the forward trajectory A is an arc-shaped trajectory along the outer peripheral surface of the anvil roll 1, both sides are corner portions having a large curvature, and the return direction trajectory B4 has a larger curvature than the forward trajectory A (curvature). The arc-shaped surface has a short radius.

  Further, in FIG. 11C, the forward trajectory A is an arc trajectory along the outer peripheral surface of the anvil roll 1, the both ends are turning points (dead points) a1 and a2, and the return direction trajectory B5 is from the turning point a1. A circular trajectory reaching the turning point a1 through the rising inclined surface b2, the top surface b3 formed of a flat surface or an arcuate surface convex upward, and the inclined surface b1 descending from the top surface b3 is shown. Here, b2, b3 and b1 may be one arcuate surface having a larger curvature (shorter radius of curvature) than the arcuate surface of the forward trajectory A, and b2 and b1 are both substantially linearly symmetric. The inclined surface b3 may be an arcuate surface having a larger or smaller curvature than the arcuate surface of the forward trajectory A or the same curvature. In the return direction trajectory B5, after returning at a2, the constant distance returns the same trajectory as the forward trajectory A, rises b2 midway, merges with the forward trajectory A from the top surface b3 through b1, and returns a constant distance. After that, it may be folded back at a1. Further, as shown in FIG. 11D, a circular trajectory in which turning points a1 and a2 are generated, which is composed of a forward trajectory A and a return trajectory B6, is given to the ultrasonic horn 3, and the ultrasonic horn 3 is separated from the outer periphery of the anvil roll 1. It is possible to substantially match the turning points a1 and a2 with the starting point and the ending point. That is, the ultrasonic horn 3 starts to be separated from the anvil roll 1 in synchronization with the time when the ultrasonic horn 3 turns back the end a2 of the forward trajectory.

  The cam 18 in FIG. 7C is an example of the cam 18 that gives the circular trajectory in FIGS. 11A to 11C. One end of the cam 18 is, for example, an inclined surface 24a, a top surface 24b, and an inclined surface 24c, which may be one arcuate surface having a larger curvature than the outer peripheral arc of the anvil roll 1, or the inclined surfaces 24a, 24c may be It is a straight surface, and the top surface 24b may be configured by an arc-shaped surface having a larger or smaller curvature than the outer peripheral arc of the anvil roll 1 or a similar degree. Further, the inclined surfaces 24a and 24c may be arc-shaped surfaces that are convex or concave outward, and the top surface 24b is an arc-shaped surface that is convex outward, and these 24a to 24c may be smoothly continuous. .

  In any case, in the case of the cam surface 24 of the cam 18 as shown in FIG. 7C, including the case where the top 24b is a straight flat surface (FIG. 7B), the return direction trajectories B and B1 of the ultrasonic horn 1 are included. ˜B5 is an arcuate surface that is spaced outward from the outer peripheral surface of the anvil roll 1 with respect to the forward trajectory A, and corresponds to, for example, FIGS. 11A, 11B, and 11C.

  FIG. 12 shows the relative positional relationship between the cam 18 and both ends P 1 and P 2 of the reciprocating arc locus of the ultrasonic horn 3 provided by the swing arm 11. Basically, the ultrasonic horn 3 and the cam follower 19 are integrated, and the anvil roll 1 moves in the same direction as the ultrasonic horn 3 when the ultrasonic horn 3 (cam follower 19) moves in the forward direction (counterclockwise in the figure). Since it rotates, the cam 18 fixed to the anvil roll 1 also rotates in the same direction (counterclockwise in the figure), and the ultrasonic horn 3 tries to return from the swing end P2 (the end of the forward trajectory). A cam follower 19 rides on a cam 18 that circulates counterclockwise in the vicinity, and the ultrasonic horn 3 moves in a direction away from the outer periphery of the anvil roll 1 (the surface of the anvil 2), and the swing end (end of the return direction trajectory) ) Return to P1.

Here, as shown in FIG. 12A, when the ultrasonic horn 3 reaches the swing end P2, the tip C1 of the cam 18 fixed to the anvil roll 1 rotating in the same direction also reaches P2. For example, the cam follower 19 rides on the cam 18 almost simultaneously with the start of the return movement of the ultrasonic horn 3. In this case, for example, a circular trajectory of the ultrasonic horn 3 by a forward trajectory A and a return trajectory B6 as shown in FIG. 11D can be used.
Further, as shown in FIG. 12B, when the ultrasonic horn 3 reaches the counterclockwise swing end (end of the forward trajectory) P2 in the figure, the tip C1 of the cam moving in the same direction is the P2 of the cam. If the positional relationship does not reach (-y delay / following), the cam follower 19 rides on the cam 18 that rotates in the clockwise direction while the ultrasonic horn 3 reaches P2 from P1 and returns to P1. Thus, the ultrasonic horn 3 starts to be separated from the outer peripheral surface of the anvil roll 1. In this case, a circular trajectory as shown in FIGS. 10 and 11C can be given to the ultrasonic horn 3.

  On the other hand, as shown in FIG. 12C, before the ultrasonic horn 3 reaches the counterclockwise oscillating end (end of the forward trajectory) P2, the cam 18 that also moves (circulates) in the counterclockwise direction is provided. The positional relationship between the cam 18 and the ultrasonic horn 3 can be determined so as to pass the cam follower 19 of the ultrasonic horn 3. As described above, the anvil roll 1 (the cam 18 fixed thereto) rotates (circulates) at a constant speed in the forward trajectory of the ultrasonic horn 3, whereas the ultrasonic horn moves in the same direction. No. 3 has a maximum speed in the middle of the forward trajectory, and the speed decreases (lowers) as it approaches the swing end P2. For this reason, the tip C1 of the cam 18 overtakes the cam follower 18 of the ultrasonic horn 3 before the swinging end P2, and the tip C1 of the cam 18 may precede the center of the cam follower 18 by + y at the position P2. In this case, since the tip C1 of the cam 18 reaches the cam follower 19 and enters under the cam follower 19 before the ultrasonic horn 3 reaches the forward swing end P2, the ultrasonic horn 3 swings. The separation starts from the outer peripheral surface of the anvil roll 1 (anvil 2) before the end P2, and the turn is made with reference to P2 while separating, and the return direction locus to P1 is traced. Thereby, for example, the circular trajectories of FIGS. 8, 9, 11A, and 11B can be given to the ultrasonic horn 3 through the cam follower 19.

  As shown in FIG. 13, two rows of projection groups 2a for forming a seal pattern are formed on the surface of the anvil 2, (A) is a spread form on one side, (B) is a parallel form, As will be described later, the seal pattern is applied to the overlapped sheet-like workpiece 26. For example, as shown in FIG. 14, the sheet-like workpiece 26 is folded in two, which is affixed at a predetermined interval so that the water absorbing member 29 crosses between the first sheet portion 27 and the second sheet portion 28. The sheet-like work 26 is folded into the anvil roll 1 shown in FIG. 5 via the conveyance roll 30 and sealed by the ultrasonic horn 3 and the anvil 2. It will be sent to downstream processes (cutting process etc.) via. FIG. 15 shows such a state, and the water absorbing member 29 is pasted over the two sheet portions 27, 28, folded in half, and then joined (welded) by ultrasonic waves, and the two seal portions 32. Are formed at predetermined intervals, and are cut at a cutting line 33 between the two seal portions 32 to separate the sheet-like workpiece 26 into individual products or intermediate products 34.

  In addition, as a form of the sheet-like workpiece, for example, as shown in FIG. 16, a sheet-like workpiece 38 in which a water absorbing member 36 is attached to the sheet portion 35 and an opening 37 is formed therebetween is folded in half. Even in this case, two seal lines 32 are formed by ultrasonic waves at a predetermined interval, and are cut at a cutting line 33 therebetween to form individual products or intermediate products 39. The seal line 32 in FIGS. 15 and 16 is different depending on whether the projection group 2a in FIG. 13A or 13B is parallel or widened, but the waist portion is inclined when the seal line is wide. It will be. In FIG. 17, such a sheet-like work 26 or 38 is supplied to the anvil roll 1, and the overlapping sheet portions are sandwiched between the ultrasonic horn 3 and the projection group 2 a of the anvil 2, and the ultrasonic wave The overlapping sheet portion is melted and sealed by heat generated by ultrasonic vibration by vibration energy applied from the horn 3.

  The outer peripheral surface of the anvil 2 is substantially formed along an arc centered on the center line of the anvil roll 1. Moreover, although the rotational speed of the anvil roll 1 and the moving speed of the ultrasonic horn 3 are approximated, the speed in the reciprocating arc motion of the ultrasonic horn 3 is slow (or zero) at the base end in a sine curve, and fast in the middle. It will also be slow (or zero) at the end. Accordingly, the ultrasonic horn 3 moves relative to the anvil 2 that moves at a constant speed within a swing range, and moves to a certain degree on the surface of the sheet-like workpiece 26 to some extent while the sheet-like workpiece 26 is placed on the two protrusion groups 2a. Will be pressed (sealed).

  The sealing operation is performed by an arc-shaped forward trajectory A in the trajectory of the ultrasonic horn 3 (the trajectory of the cam follower 19) shown in FIGS. 8 to 11, and after the sealing, the arm 11 in FIG. Thus, in FIGS. 8 to 11, it returns to the original state via return direction trajectories B and B 1 to B 5 different from the forward trajectory A. At this time, since the ultrasonic horn 3 is displaced away from the outer peripheral surface of the anvil roll 1, it is easy to avoid the tip of the ultrasonic horn 3 returning while rubbing the sheet-like workpiece 38. Further, if the circular trajectories of FIGS. 8, 9, 11A, and 11B are given to the ultrasonic horn 3, no dead point of the movement occurs at the beginning and end of the forward trajectory A. It can move smoothly. On the other hand, if the circular trajectories B2 and B5 of FIG. 10 and FIG. 11C are applied to the ultrasonic horn 3, a moment (dead point) where the moving speed becomes zero in the forward trajectory A occurs. Can be set to the minimum necessary to avoid contact with the sheet-like workpiece 26 or 38, and the traveling trajectory of the ultrasonic horn 3 can be made simpler.

  In addition to applying the forward stroke of the ultrasonic horn 3 with the swing arm 11 and applying the return stroke with the cam 18 fixed to the anvil roll 1, there are other methods and forms. As an example, as shown in FIG. 18, a fixed cam member 40 is provided, and a cam groove 41 corresponding to a circular trajectory to be applied to the ultrasonic horn 3 is formed in the cam member 40, and the cam groove 41 The cam follower 42 on the sonic horn 3 side is engaged. As shown in FIG. 19, when the ultrasonic unit 5 is swung through the connecting portion 14 by the rotation of the crank portion 15 in the support portion 10, the cam follower 42 circulates in the cam groove 41, A movement trajectory can be directly given to the sonic horn 3. A locus corresponding to the cam groove 42 can be formed corresponding to FIGS. In the example of FIG. 18, an arc-shaped forward trajectory A along the outer peripheral surface of the anvil roll 1 and a return direction trajectory B mainly composed of a linear portion (or an arc-shaped portion that protrudes outward) are provided. The folded portion or the corner portion is smoothly connected between them.

  The premise of swinging the swing arm 11 by the crank 15 or the like is not necessarily essential. For example, as shown in FIG. 20, the support portion 10 is supported by a linear or arcuate other fixed guide 43 provided on a fixed member so as to be reciprocally movable (slidable), and the ultrasonic wave unit is supported on the support portion 10. 5 is supported so as to be able to approach and separate from the outer peripheral surface of the anvil roll 1, and the support portion 10 is reciprocated by the crank portion 15. Assuming this, the swing arm 11 is not necessary. Then, the cam follower 42 on the ultrasonic unit 5 side is engaged with the cam groove 41 formed in the fixed cam member 40, so that the locus similar to the example shown in FIGS. 3 can be given.

  Although several embodiments have been described above, the present invention is not construed as being limited to these descriptions, and various modifications can be made without departing from the spirit of the present invention.

1 Anvil roll (rotating body)
2 Anvil (convex)
DESCRIPTION OF SYMBOLS 3 Ultrasonic horn 4 Ultrasonic generator 5 Ultrasonic unit 10 Support part 11 Swing arm 12 Linear guide 13 Stopper 14 Connection part 15 Crank part 18 Cam 19 Cam follower 24 Cam surface 26, 38 Sheet-like work 27 1st sheet | seat part 28 2nd sheet | seat parts 29 and 36 Water absorption member 32 Seal line 33 Cutting line 40 Cam member 41 Cam groove 42 Cam follower

  The present invention relates to an ultrasonic bonding apparatus for bonding by ultrasonic waves in a state where first and second sheet portions having flexibility and heat-welding properties are overlapped.

  2. Description of the Related Art Conventionally, an ultrasonic sealing device is known as a member for joining (sealing) sheets of synthetic resin such as disposable paper diapers or fibers or nonwoven fabrics containing synthetic resin.

Japanese Patent No. 4297715

This technique uses an ultrasonic seal when the rotating body and the ultrasonic horn move in the same direction due to a reciprocating trajectory that swings the ultrasonic horn along the outer peripheral surface of the sheet conveying rotating body. It returns and repeats the same arc motion, and there is an advantage that the ultrasonic horn can increase the sealing time compared to the fixed type.

  However, there is a risk that the surface of the sheet will be rubbed and damaged or the value of the product may be reduced when returning with an arc locus. The present invention has been made to solve the above-described problems.

Means for Solving the Problems and Effects of the Invention

The present invention is an apparatus for joining by ultrasonic waves in a state where the first sheet portion and the second sheet portion having flexibility and heat-welding property are overlapped,
An ultrasonic horn facing the first sheet portion and the second sheet portion in a stacked state;
A rotary body that conveys the first and second sheet portions and sandwiches both the sheet portions with the ultrasonic horn, and
Returning the ultrasonic horn toward the start point side of the forward trajectory while being separated from the rotational trajectory of the rotating body following the end of the forward trajectory corresponding to the rotating trajectory of the rotating body and the end of the forward trajectory. An ultrasonic horn moving device that moves along a circular trajectory including a direction trajectory,
In the forward trajectory of the ultrasonic horn, the first and second sheet portions are joined by ultrasonic waves while being sandwiched in cooperation with the rotating body.

  Thereby, as conceptually shown in FIG. 1 and FIG. 2, the ultrasonic horn facing the rotating body that conveys the overlapped sheet portions is sealed with a forward trajectory corresponding to the rotating trajectory of the rotating body. And a return direction trajectory that returns to the original while being separated from the rotating body is provided following the forward direction trajectory. Unlike the conventional reciprocating arc trajectory shown in FIG. Inconveniences such as rubbing the surface are less likely to occur.

  In addition, as shown in FIG. 2, it is possible to prevent the return dead points d1 and d2 that always occur in the prior art shown in FIG. 4 when approaching / separating from the rotating body. It becomes easier to move the horn more smoothly.

  As an embodiment, a plurality of convex portions projecting toward the ultrasonic horn at predetermined intervals are provided on the outer peripheral surface of the rotating body, the forward trajectory corresponding to the rotational trajectory of the convex portion, and the convex portion The ultrasonic horn moving device moves the ultrasonic horn along the circular trajectory including a return trajectory returning to the start end side of the forward trajectory while being separated from the rotation trajectory, and the forward trajectory of the ultrasonic horn The first and second sheet portions are joined by ultrasonic waves while being held in cooperation with the convex portions of the rotating body.

  By sandwiching the sheet portion overlapped between such a convex part (so-called anvil) and the ultrasonic horn, the ultrasonic vibration of the ultrasonic horn is intensively transmitted to the seal location, and a good seal can be obtained even in a short time. it can.

As an embodiment, the return direction trajectory includes a linear trajectory or an arc-shaped trajectory that is convex in a direction away from the outer peripheral surface of the rotating body.
As the number of linear trajectory portions increases, the ultrasonic horn returns to the original position at a short distance and can be prepared for the next seal, and the circularity is improved by including the arc-shaped trajectory.

  As an embodiment, the ultrasonic horn is moved toward and away from the outer periphery of the rotating body by a swinging mechanism on a support section that swings around an axis concentric with the rotation center of the rotating body in the forward path and the return path. On the other hand, on the outer periphery of the rotating body, the ultrasonic horn is separated from the outer periphery of the rotating body according to the relative movement between the rotation of the rotating body and the backward movement of the swing mechanism. A cam to be approached again is provided, the forward trajectory of the ultrasonic horn is given by the forward movement of the rocking mechanism, and the return direction trajectory is given by a combination of the backward movement of the rocking mechanism and the cam. .

  The movement trajectory of the ultrasonic horn can be given by, for example, a circulating cam groove, but the forward trajectory of the ultrasonic horn is given by, for example, an arc trajectory by the reciprocating arc motion of the arm, and the return direction trajectory is applied to the rotating body. If the ultrasonic horn is moved away from the rotating body by the provided cam, the forward trajectory and the return trajectory can be given to the ultrasonic horn with a simpler configuration.

The figure which shows this invention notionally. The figure explaining the circulation locus | trajectory of the ultrasonic horn illustratively. The figure explaining the surrounding surface locus | trajectory of the ultrasonic horn of a prior art example. The figure explaining the turning dead center with the conventional ultrasonic horn locus | trajectory. The front view which shows simply one Example of this invention. The figure which shows simply the positional relationship of the anvil and cam in FIG. 5A. The side view of FIG. 5A. The figure which shows Example 1 of the cam attached to the anvil roll. The figure which shows Example 2 of the cam attached to the anvil roll. The figure which shows Example 3 of the cam attached to the anvil roll. The figure which shows Example 1 of the cyclic locus provided to an ultrasonic horn. The figure which shows Example 2 of a cyclic locus. Diagram showing an example 3 of the cyclic trajectory. The figure which shows Example 4 of a cyclic locus. The figure which shows Example 5 of a cyclic locus. The figure which shows the example 6 of a cyclic locus. The figure which shows Example 7 of a cyclic locus. The figure which shows the positional relationship of the rocking | fluctuation range of an ultrasonic horn, and a cam. The figure which shows the example of the protrusion of the surface of an anvil. The figure which shows an example of a sheet-like workpiece. The figure which shows the top view of a sheet-like workpiece | work, the sealing process provided to it, and a cutting process. The top view which shows another sheet-like workpiece | work, the sealing process with respect to the workpiece | work, and a cutting process. The figure which shows the sealing process by an ultrasonic horn and an anvil. The figure which shows the cam member and cam groove in another Example. The front view which shows the moving mechanism of the ultrasonic horn using the cam groove of FIG. The front view which shows the moving mechanism of the ultrasonic horn in another Example.

An ultrasonic bonding (seal) apparatus shown in FIG. 5A includes an anvil roll 1 as a rotating body having an anvil 2 as a convex portion on the outer peripheral surface, an ultrasonic horn 3 and an ultrasonic wave facing the outer peripheral surface of the anvil roll 1. And an ultrasonic unit 5 including the generator 4. The anvil roll 1 is rotatably supported by a support 7 on the ground surface by a rotation shaft 6 at the center thereof, and is driven to rotate by a motor 8 as a rotating body driving device. The ultrasonic unit 5 is supported so as to be swingable by a support portion 10 attached to a swing arm 11 whose base end can swing around one axis. In this example, the arm 11 is supported by a support 7 so as to be swingable by a shaft (bearing) 6 b (FIG. 6) concentric with the rotating shaft 6 of the anvil roll 1, and the ultrasonic unit 5 is also supported via the support portion 10. It swings around a center line concentric with the center of rotation of the anvil roll 1.

The ultrasonic unit 5 is supported by the support portion 10 so as to be able to approach and separate from the outer peripheral surface of the anvil roll 1, and in this example, the linear guide (linear bearing) 12 holds the ultrasonic unit 5 with respect to the support portion 10 within a predetermined range. Slide with.

  The movement of the ultrasonic unit 5 in the direction approaching (for example, descending) the anvil roll 1 is regulated by a stopper 13 provided in the support unit 10, and the movement of the ultrasonic horn 3 beyond a certain limit toward the anvil roll 1 is performed. Be blocked. A crank portion 15 is connected to the support portion 10 via a connecting portion 14. The crank portion 15 is rotationally driven around a central axis by a motor 16 as a crank driving device, and the support portion 10 and the arm 11 are reciprocated in a circular arc motion (pendulum motion) via a connecting portion 14 that is eccentrically connected to the crank portion 15. Let

  The motor 16 that drives the crank portion 15 and the motor 8 that drives the anvil roll 1 are not separate motors, but a common motor is used, and the drive of this motor is distributed to the anvil roll 1 and the crank portion 15. It is also possible to take a predetermined synchronization.

  A plurality (four in this example) of anvils 2 are provided at predetermined equal intervals so as to protrude from the outer periphery of the anvil roll 1. Corresponding to these anvils 2, a plurality of cams 18 (four in this example) are provided on the outer periphery of the anvil roll 1 so as to protrude from the outer periphery of the anvil roll 1. As schematically shown in FIG. 5B, the cam 18 does not interfere with the anvil 2 with respect to the anvil 2 fixed to the outer periphery of the anvil roll 1, and occupies a position overlapping (stacked) with the anvil 2 in a front view, Conceptually, the cam 18 is in front and the anvil is positioned behind it. The ultrasonic unit 5 is provided with a cam follower 19 for these cams 18. The cam follower 19 moves up and down on each cam 18 as the anvil roll 1 rotates, and ascends and descends according to the cam curve of each cam 18 in the direction approaching and separating from the outer periphery of the anvil roll 1 with respect to the support portion 10.

Figure 6 is a schematic side view of FIG. 5 A, the anvil roll 1 as described above, is rotatably supported on both sides of the abutment 7 via the shaft 6, the arm 1 1 of one of the abutment 7 The base end portion is supported by the bearing 6b so as to be swingable (turnable within a predetermined angle range). From the free end of the arm 1 1, parallel to the supporting portion 10 and the shaft 6 extends in a cantilever state, the ultrasonic wave unit 5 described above on the front end side is supported. The anvil 2 of the anvil roll 1 and the cam 18 do not interfere with each other. That is, the anvil 2 protrudes from one side of the outer peripheral surface of the anvil roll 1, and the cam 18 is fixed to the end surface of the roll 1 so that the cam surface protrudes from the outer periphery of the roll and can come into contact with the cam follower 19. The cam follower 19 is provided at a position protruding laterally from the side surface of the ultrasonic horn 3 via the bracket 20. The cam follower 19 does not interfere with the overlapped sheet portion sandwiched between the head portion of the ultrasonic horn 3 and the anvil 2.

  In a state where the cam follower 19 rides on the cam 18, the ultrasonic unit 5 rises upward in FIG. 6, and the stopper facing portion 21 provided in the ultrasonic unit 5 is from the above-described stopper 13 provided in the support portion 10. It is in a separated state. When the cam follower 19 gets over the cam 18 and corresponds to the blank portion up to the next cam 18, the ultrasonic unit 5 does not receive the restraint of the cam 18, so that the cam unit 19 is lowered in FIG. 6. When the stopper facing portion 21 of the ultrasonic unit 5 comes into contact with the stopper 13 provided at the position of the ultrasonic unit 5, it is regulated. One or both of the stopper 13 and the stopper facing portion 21 can be provided with an elastic member such as rubber, thereby reducing impact and noise during contact.

It should be noted that the stacked sheet portions as workpieces (workpieces) to be described later are heated inside by ultrasonic waves and bonded (sealed) by solidifying after heat melting. It is pinched between the horn 3 and the anvil 2. When adjusting the pressure (seal pressure) or when handling the sheet portion as a workpiece, when the anvil 2 is separated from the ultrasonic unit 5, the rotating shaft 6 of the anvil roll 1 is moved up and down. For this purpose, an elevating cylinder 22 is provided in the vicinity of the abutment 7, and the anvil roll 1 is moved toward and away from the ultrasonic unit 5 via the bearing portion 23 of the rotating shaft 6 by its operation.

7A to 7C show an example of the cam 18, which is formed in a plate shape, has a cam surface 24 formed on the outer edge thereof, and is fixed to the end surface of the anvil roll 1 by a fastening means such as a bolt hole 25 and a bolt (not shown). Has been. The cam surface 24 in this example protrudes from the outer peripheral surface of the anvil roll 1 and comes into contact with the cam follower 19 on the ultrasonic unit 5 side as described above. However, the cam surface 24 as a whole resembles a flat trapezoidal shape. (Inclined cam surface 24a), then extends substantially laterally (top cam surface 24b), and then descends (inclined cam surface 24c). The top cam surface 24b may be formed linearly or may be formed by an arcuate surface that is convex toward the outside of the anvil roll 1, but in this example, it is slightly concave toward the outside of the anvil roll 1. An arcuate curved surface with a small curvature.

The cam follower 19 is moved by the arm 11 along the outer peripheral arc of the anvil roll 1 and the top cam surface 24b is formed in a concave shape, so that the locus of the cam follower 19 is substantially linear as will be described later. become. In addition, the inclined cam surfaces 24a and 24c can also be formed to be linear, convex outward, or concave in the opposite direction, and in this example, an example of a curved curve that is loosely concave with respect to the anvil roll 1 is shown. Has been. And moving more given to the cam follower 19 in such a cam 18, the combination of the arc motion imparted to the cam follower 19 by the arm 11 which swings, as shown in FIG. 8, the cam follower 19 (and hence the ultrasonic horn 3) A movement trajectory is given, and a forward trajectory A along the arc centered on the center of the anvil roll 1 from the right in the figure, and a return trajectory B that returns to the original position following this forward trajectory A is given. The connecting portion between the forward direction trajectory A and the return direction trajectory B can be an arcuate corner portion, and most or middle part of the return direction trajectory B is a linear trajectory, and both sides thereof are inclined. It can be a trajectory.

  FIG. 9 shows an example in which the forward trajectory A is the same as that in FIG. 8, the return direction trajectory B1 occupies most of the straight portion, and the folded portion becomes a relatively large arcuate corner portion. FIG. 10 shows a return direction trajectory B2 in which the forward trajectory A is turned back at its end, and after returning by a certain amount along the same arc, it rises to reach a linear portion and descends to connect to the arc portion. The In this example, a dead point at which the movement of the cam follower (ultrasonic horn) instantaneously becomes zero at both ends of the forward trajectory A is generated. In any of the trajectories shown in FIGS. 8 to 10, it can be said that the ultrasonic horn moves along a circular trajectory in the sense that the trajectory always passes through different trajectories in the forward direction and the return direction.

  Further, as shown in FIG. 11A, a return direction trajectory B3 having an arcuate shape that bulges outward (becomes convex) with respect to the forward trajectory A can also be used. In this case, as shown in FIGS. 7B and 7C, the top cam surface 24b may be linear or a loose arc that protrudes outward. Further, in FIG. 11B, the forward trajectory A is an arc-shaped trajectory along the outer peripheral surface of the anvil roll 1, both sides are corner portions having a large curvature, and the return direction trajectory B4 has a larger curvature than the forward trajectory A (curvature). The arc-shaped surface has a short radius.

Further, in FIG. 11C, the forward trajectory A is an arc trajectory along the outer peripheral surface of the anvil roll 1, the both ends are turning points (dead points) a1 and a2, and the returning direction trajectory B5 is the turning point a 2. A circular trajectory reaching the turning point a1 via the inclined surface b2 rising from the top, the top surface b3 formed of a flat surface or an arcuate surface convex upward, and the inclined surface b1 descending from the top surface b3 is shown. Here, b2, b3 and b1 may be one arcuate surface having a larger curvature (shorter radius of curvature) than the arcuate surface of the forward trajectory A, and b2 and b1 are both substantially linearly symmetric. The inclined surface b3 may be an arcuate surface having a larger or smaller curvature than the arcuate surface of the forward trajectory A or the same curvature. In the return direction trajectory B5, after returning at a2, the constant distance returns the same trajectory as the forward trajectory A, rises b2 midway, merges with the forward trajectory A from the top surface b3 through b1, and returns a constant distance. After that, it may be folded back at a1. Further, as shown in FIG. 11D, a circular trajectory in which turning points a1 and a2 are generated, which is composed of a forward trajectory A and a return trajectory B6, is given to the ultrasonic horn 3, and the ultrasonic horn 3 is separated from the outer periphery of the anvil roll 1. It is possible to substantially match the turning points a1 and a2 with the starting point and the ending point. That is, the ultrasonic horn 3 starts to be separated from the anvil roll 1 in synchronization with the time when the ultrasonic horn 3 turns back the end a2 of the forward trajectory.

  The cam 18 in FIG. 7C is an example of the cam 18 that gives the circular trajectory in FIGS. 11A to 11C. One end of the cam 18 is, for example, an inclined surface 24a, a top surface 24b, and an inclined surface 24c, which may be one arcuate surface having a larger curvature than the outer peripheral arc of the anvil roll 1, or the inclined surfaces 24a, 24c may be It is a straight surface, and the top surface 24b may be configured by an arc-shaped surface having a larger or smaller curvature than the outer peripheral arc of the anvil roll 1 or a similar degree. Further, the inclined surfaces 24a and 24c may be arc-shaped surfaces that are convex or concave outward, and the top surface 24b is an arc-shaped surface that is convex outward, and these 24a to 24c may be smoothly continuous. .

In any case, in the case of the cam surface 24 of the cam 18 as shown in FIG. 7C, including the case where the top 24 b is a straight flat surface (FIG. 7B), the return direction trajectory B of the ultrasonic horn 1 is With respect to the forward trajectory A, the arcuate surface is spaced outward from the outer peripheral surface of the anvil roll 1, and corresponds to, for example, FIGS. 11A, 11B, 11C , and 11D .

  FIG. 12 shows the relative positional relationship between the cam 18 and both ends P 1 and P 2 of the reciprocating arc locus of the ultrasonic horn 3 provided by the swing arm 11. Basically, the ultrasonic horn 3 and the cam follower 19 are integrated, and the anvil roll 1 moves in the same direction as the ultrasonic horn 3 when the ultrasonic horn 3 (cam follower 19) moves in the forward direction (counterclockwise in the figure). Since it rotates, the cam 18 fixed to the anvil roll 1 also rotates in the same direction (counterclockwise in the figure), and the ultrasonic horn 3 tries to return from the swing end P2 (the end of the forward trajectory). A cam follower 19 rides on a cam 18 that circulates counterclockwise in the vicinity, and the ultrasonic horn 3 moves in a direction away from the outer periphery of the anvil roll 1 (the surface of the anvil 2), and the swing end (end of the return direction trajectory) ) Return to P1.

Here, as shown in FIG. 12A, when the ultrasonic horn 3 reaches the swing end P2, the tip C1 of the cam 18 fixed to the anvil roll 1 rotating in the same direction also reaches P2. For example, the cam follower 19 rides on the cam 18 almost simultaneously with the start of the return movement of the ultrasonic horn 3. In this case, for example, a circular trajectory of the ultrasonic horn 3 by a forward trajectory A and a return trajectory B6 as shown in FIG. 11D can be used.
Further, as shown in FIG. 12B, when the ultrasonic horn 3 reaches the counterclockwise swing end (end of the forward trajectory) P2 in the figure, the tip C1 of the cam moving in the same direction is the P2 of the cam. If the positional relationship does not reach (-y delay / following), the cam follower 19 rides on the cam 18 that rotates in the clockwise direction while the ultrasonic horn 3 reaches P2 from P1 and returns to P1. Thus, the ultrasonic horn 3 starts to be separated from the outer peripheral surface of the anvil roll 1. In this case, a circular trajectory as shown in FIGS. 10 and 11C can be given to the ultrasonic horn 3.

On the other hand, as shown in FIG. 12C, before the ultrasonic horn 3 reaches the counterclockwise oscillating end (end of the forward trajectory) P2, the cam 18 that also moves (circulates) in the counterclockwise direction is provided. The positional relationship between the cam 18 and the ultrasonic horn 3 can be determined so as to pass the cam follower 19 of the ultrasonic horn 3. As described above, the anvil roll 1 (the cam 18 fixed thereto) rotates (circulates) at a constant speed in the forward trajectory of the ultrasonic horn 3, whereas the ultrasonic horn moves in the same direction. No. 3 has a maximum speed in the middle of the forward trajectory, and the speed decreases (lowers) as it approaches the swing end P2. Therefore, overtaking the cam follower 1 9 tip C1 is of the ultrasonic horn 3 of the cam 18 in front of Yuradotan P2, with respect to the center tip C1 is cam follower 1 9 of the cam 18 is at the position of P2, if the preceding only + y Arise. In this case, since the tip C1 of the cam 18 reaches the cam follower 19 and enters under the cam follower 19 before the ultrasonic horn 3 reaches the forward swing end P2, the ultrasonic horn 3 swings. The separation starts from the outer peripheral surface of the anvil roll 1 (anvil 2) before the end P2, and the turn is made with reference to P2 while separating, and the return direction locus to P1 is traced. Thereby, for example, the circular trajectories of FIGS. 8, 9, 11A, and 11B can be given to the ultrasonic horn 3 through the cam follower 19.

  As shown in FIG. 13, two rows of projection groups 2a for forming a seal pattern are formed on the surface of the anvil 2, (A) is a spread form on one side, (B) is a parallel form, As will be described later, the seal pattern is applied to the overlapped sheet-like workpiece 26. For example, as shown in FIG. 14, the sheet-like workpiece 26 is folded in two, which is affixed at a predetermined interval so that the water absorbing member 29 crosses between the first sheet portion 27 and the second sheet portion 28. The sheet-like work 26 is folded into the anvil roll 1 shown in FIG. 5 via the conveyance roll 30 and sealed by the ultrasonic horn 3 and the anvil 2. It will be sent to downstream processes (cutting process etc.) via. FIG. 15 shows such a state, and the water absorbing member 29 is pasted over the two sheet portions 27, 28, folded in half, and then joined (welded) by ultrasonic waves, and the two seal portions 32. Are formed at predetermined intervals, and are cut at a cutting line 33 between the two seal portions 32 to separate the sheet-like workpiece 26 into individual products or intermediate products 34.

  In addition, as a form of the sheet-like workpiece, for example, as shown in FIG. 16, a sheet-like workpiece 38 in which a water absorbing member 36 is attached to the sheet portion 35 and an opening 37 is formed therebetween is folded in half. Even in this case, two seal lines 32 are formed by ultrasonic waves at a predetermined interval, and are cut at a cutting line 33 therebetween to form individual products or intermediate products 39. The seal line 32 in FIGS. 15 and 16 is different depending on whether the projection group 2a in FIG. 13A or 13B is parallel or widened, but the waist portion is inclined when the seal line is wide. It will be. In FIG. 17, such a sheet-like work 26 or 38 is supplied to the anvil roll 1, and the overlapping sheet portions are sandwiched between the ultrasonic horn 3 and the projection group 2 a of the anvil 2, and the ultrasonic wave The overlapping sheet portion is melted and sealed by heat generated by ultrasonic vibration by vibration energy applied from the horn 3.

  The outer peripheral surface of the anvil 2 is substantially formed along an arc centered on the center line of the anvil roll 1. Moreover, although the rotational speed of the anvil roll 1 and the moving speed of the ultrasonic horn 3 are approximated, the speed in the reciprocating arc motion of the ultrasonic horn 3 is slow (or zero) at the base end in a sine curve, and fast in the middle. It will also be slow (or zero) at the end. Accordingly, the ultrasonic horn 3 moves relative to the anvil 2 that moves at a constant speed within a swing range, and moves to a certain degree on the surface of the sheet-like workpiece 26 to some extent while the sheet-like workpiece 26 is placed on the two protrusion groups 2a. Will be pressed (sealed).

Its sealing operation does this by an arcuate forward trajectory A in the trajectory of the ultrasonic horn 3 shown in FIGS. 8 to 11 C (the locus of the cam follower 19), after sealing, GyakuYura arm 11 in FIG. 5 8 to 11, the movement returns to the original through return direction trajectories B and B 1 to B 6 different from the forward direction trajectory A. At this time, since the ultrasonic horn 3 is displaced away from the outer peripheral surface of the anvil roll 1, it is easy to avoid the tip of the ultrasonic horn 3 returning while rubbing the sheet-like workpiece 38. Further, if the circular trajectories of FIGS. 8, 9, 11A, and 11B are given to the ultrasonic horn 3, no dead point of the movement occurs at the beginning and end of the forward trajectory A. It can move smoothly. On the other hand, if the circular trajectories B2 and B5 of FIG. 10, FIG. 11C , and FIG . 11D are applied to the ultrasonic horn 3, a moment (dead point) where the moving speed becomes zero in the forward trajectory A occurs. The lift amount of the ultrasonic horn 3 can be set to the minimum necessary to avoid contact with the sheet-like workpiece 26 or 38, and the circular trajectory of the ultrasonic horn 3 can be made simpler.

In addition to applying the forward stroke of the ultrasonic horn 3 with the swing arm 11 and applying the return stroke with the cam 18 fixed to the anvil roll 1, there are other methods and forms. As an example, as shown in FIG. 18, a fixed cam member 40 is provided, and a cam groove 41 corresponding to a circular trajectory to be applied to the ultrasonic horn 3 is formed in the cam member 40, and the cam groove 41 The cam follower 42 on the sonic horn 3 side is engaged. As shown in FIG. 19, when the ultrasonic unit 5 is swung through the connecting portion 14 by the rotation of the crank portion 15 in the support portion 10, the cam follower 42 circulates in the cam groove 41, A movement trajectory can be directly given to the sonic horn 3. The trajectory by the cam groove 4 1 can be formed is that corresponding to FIGS. 8 to 11. In the example of FIG. 18, an arc-shaped forward trajectory A along the outer peripheral surface of the anvil roll 1 and a return direction trajectory B mainly composed of a linear portion (or an arc-shaped portion that protrudes outward) are provided. The folded portion or the corner portion is smoothly connected between them.

  The premise of swinging the swing arm 11 by the crank 15 or the like is not necessarily essential. For example, as shown in FIG. 20, the support portion 10 is supported by a linear or arcuate other fixed guide 43 provided on a fixed member so as to be reciprocally movable (slidable), and the ultrasonic wave unit is supported on the support portion 10. 5 is supported so as to be able to approach and separate from the outer peripheral surface of the anvil roll 1, and the support portion 10 is reciprocated by the crank portion 15. Assuming this, the swing arm 11 is not necessary. Then, the cam follower 42 on the ultrasonic unit 5 side is engaged with the cam groove 41 formed in the fixed cam member 40, so that the locus similar to the example shown in FIGS. 3 can be given.

  Although several embodiments have been described above, the present invention is not construed as being limited to these descriptions, and various modifications can be made without departing from the spirit of the present invention.

1 Anvil roll (rotating body)
2 Anvil (convex)
DESCRIPTION OF SYMBOLS 3 Ultrasonic horn 4 Ultrasonic generator 5 Ultrasonic unit 10 Support part 11 Swing arm 12 Linear guide 13 Stopper 14 Connection part 15 Crank part 18 Cam 19 Cam follower 24 Cam surface 26, 38 Sheet-like work 27 1st sheet | seat part 28 2nd sheet | seat parts 29 and 36 Water absorption member 32 Seal line 33 Cutting line 40 Cam member 41 Cam groove 42 Cam follower

The present invention is an apparatus for joining by ultrasonic waves in a state where the first sheet portion and the second sheet portion having flexibility and heat-welding property are overlapped,
An ultrasonic horn facing the first sheet portion and the second sheet portion in a stacked state;
A rotary body that conveys the first and second sheet portions and sandwiches both the sheet portions with the ultrasonic horn, and
Returning the ultrasonic horn toward the start point side of the forward trajectory while being separated from the rotational trajectory of the rotating body following the end of the forward trajectory corresponding to the rotating trajectory of the rotating body and the end of the forward trajectory. An ultrasonic horn moving device that moves along a circular trajectory including a direction trajectory,
Wherein together joined by ultrasonic while ration the first and second sheet portions in cooperation with the rotary body in the forward path of the ultrasonic horn,
The ultrasonic horn is movable in a direction of approaching and separating from the outer periphery of the rotating body to a support section that swings in an outward path and a return path around an axis concentric with the rotation center of the rotating body by a swinging mechanism. On the other hand, a cam that moves the ultrasonic horn away from the outer periphery of the rotating body according to the relative movement between the rotation of the rotating body and the backward movement of the swing mechanism after being moved away from the outer periphery of the rotating body. The forward trajectory of the ultrasonic horn is given by the forward movement of the rocking mechanism, and the return trajectory is given by a combination of the backward movement of the rocking mechanism and the cam. And

Claims (4)

An apparatus for joining by ultrasonic waves in a state where the first sheet portion and the second sheet portion having flexibility and heat-weldability are overlapped,
An ultrasonic horn facing the first sheet portion and the second sheet portion in a stacked state;
A rotary body that conveys the first and second sheet portions and sandwiches both the sheet portions with the ultrasonic horn, and
Returning the ultrasonic horn toward the start point side of the forward trajectory while being separated from the rotational trajectory of the rotating body following the end of the forward trajectory corresponding to the rotating trajectory of the rotating body and the end of the forward trajectory. An ultrasonic horn moving device that moves along a circular trajectory including a direction trajectory,
An ultrasonic bonding apparatus characterized in that the first and second sheet portions are joined together by the ultrasonic wave in a forward locus of the ultrasonic horn while being sandwiched in cooperation with the rotating body.   A plurality of convex portions projecting toward the ultrasonic horn at predetermined intervals are provided on the outer peripheral surface of the rotating body, the forward trajectory corresponding to the rotational trajectory of the convex portion, and spaced from the rotational trajectory of the convex portion. The ultrasonic horn moving device moves the ultrasonic horn along the circular trajectory including the return direction trajectory returning to the starting end side of the forward trajectory, and the first and the first in the forward trajectory of the ultrasonic horn The ultrasonic bonding apparatus according to claim 1, wherein the second sheet portion is bonded by ultrasonic waves while being sandwiched in cooperation with the convex portion of the rotating body.   The ultrasonic bonding apparatus according to claim 1, wherein the return direction trajectory includes a linear trajectory or an arc-shaped trajectory that protrudes in a direction away from the outer peripheral surface of the rotating body.   The ultrasonic horn is movable in a direction of approaching and separating from the outer periphery of the rotating body to a support section that swings in an outward path and a return path around an axis concentric with the rotation center of the rotating body by a swinging mechanism. On the other hand, a cam that moves the ultrasonic horn away from the outer periphery of the rotating body according to the relative movement between the rotation of the rotating body and the backward movement of the swing mechanism after being moved away from the outer periphery of the rotating body. The forward trajectory of the ultrasonic horn is given by the forward movement of the swing mechanism, and the return trajectory is given by a combination of the backward movement of the swing mechanism and the cam. 4. The ultrasonic bonding apparatus according to any one of items 3.

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