JP5089821B1 - Sealing device - Google Patents

Abstract

A sealing device that can reduce manufacturing costs and is easy to maintain.
[Solution]
A rotating body driven to convey the work to be sealed, a seal head that faces the outer peripheral surface of the rotating body through the work to be sealed and applies heat for sealing to the work to be sealed; The workpiece to be sealed can be sandwiched between the seal head and the seal head driving device that repeats the forward movement in the forward direction with respect to the conveyance of the workpiece to be sealed and the backward movement in the return direction opposite to the forward direction, And a head facing portion incorporated in the rotary body in a state in which forward movement in the forward direction and backward movement in the return direction are possible with respect to the conveyance of the work to be sealed, and the head facing portion is connected to the forward path of the seal head. The forward movement and the backward movement are interlocked with the movement and the backward movement, and a path for sandwiching the belt-like seal with the seal head in the forward movement is provided. And a de-facing section drive unit.
Sealing is performed in a state where both the sealing head and the head facing portion both move in the forward path while sandwiching the workpiece to be sealed, and the same sealing operation is repeated after both of them move back.
[Selection] Figure 3A

Description

  The present invention relates to a sealing device that seals a sealed portion having flexibility and heat welding.

  2. Description of the Related Art Conventionally, for example, an ultrasonic sealing device is known as a member that joins (seal) synthetic resin such as disposable disposable diapers or sheet portions such as fibers or nonwoven fabrics containing synthetic resin.

Japanese Patent No. 4297715

  In this technology, anvils (convex parts) are installed at equiangular intervals on the outer peripheral surface of the rotating body, and a continuous soft work is conveyed according to the rotation of the rotating body, and the ultrasonic horn facing the anvil moves in a reciprocating arc. When the soft work is sandwiched between the anvil and the ultrasonic horn and moved in the same direction (conveying direction of the soft work), the work is thermally welded (sealed) by heat generated by ultrasonic vibration. After sealing, the ultrasonic horn returns to its original position and repeats the same operation with the anvil that comes after the outer peripheral surface of the rotating body. If, for example, six anvils are fixed to the outer peripheral surface of the rotating body, the ultrasonic horn reciprocates six times with one rotation of the rotating body, and seals six times in cooperation with the anvil. According to this, since the reciprocating ultrasonic horn follows and seals the soft work for a certain period of time, there is an advantage that the sealing time can be increased compared to the fixed ultrasonic horn, and when the soft work is transported at high speed However, a certain level of sealing quality can be obtained.

  However, it is required that the outer peripheral surfaces of a plurality of anvils (convex portions) installed on the outer peripheral surface of the rotating body be located on the same circumference as much as possible, and the interval between each anvil and the ultrasonic horn is not uniform. And that is directly linked to variations in seal quality. Therefore, after fixing a plurality of anvils to the rotating body, it is necessary to perform highly accurate outer periphery polishing so that the outer peripheral surfaces of the plurality of anvils are on the same circumference. Furthermore, if one of the multiple anvils is damaged or there is a setup change that changes the seal pattern (seal pattern) of the anvil, all the anvils are removed from the outer peripheral surface of the rotating body and replaced with multiple new anvils. After that, the outer peripheral surface needs to be re-polished. Therefore, much time and labor are required, and the cost of the apparatus is increased.

Means for Solving the Problems and Effects of the Invention

This invention is a sealing device for joining a sealed portion of a flexible continuous or discontinuous sealed workpiece having heat weldability by heat,
A rotating body driven to convey the work to be sealed;
A seal head that opposes the outer peripheral surface of the rotating body through the work to be sealed and applies heat for sealing to the work to be sealed;
A seal head driving device that repeatedly moves the seal head in the forward direction with respect to the conveyance of the work to be sealed, and repeats moving in the reverse direction in the reverse direction;
A workpiece to be sealed can be sandwiched between the seal head and incorporated in the rotating body in a state in which forward movement in the forward direction and backward movement in the return direction are possible with respect to the conveyance of the workpiece to be sealed. Head facing part,
A head facing portion driving device that moves the head facing portion in the forward and backward directions in conjunction with the forward and backward movements of the seal head and provides a locus for sandwiching the workpiece to be sealed with the seal head in the forward motion. And comprising
Sealing is performed while both the sealing head and the head-facing portion move in the forward path, and the workpiece to be sealed is sandwiched between them, and the same sealing operation is repeated after both the return path movements.

  In an embodiment, the head facing portion is given a forward trajectory that approaches the seal head side from the space formed in the outer peripheral portion of the rotating body in the forward movement and moves in the forward direction together with the seal head, and In the inward movement, a return direction trajectory that moves by shifting from the forward trajectory toward the center of the rotating body is given.

  In an embodiment, the seal head is given the same circular reciprocation locus along the outer circumferential surface of the rotating body as the forward trajectory of the forward movement and the return direction trajectory of the backward movement, or the forward movement thereof. Is given an arc-shaped forward trajectory along the outer peripheral surface of the rotating body, and in the return movement, a returning direction trajectory is provided which moves away from the forward locus to the side away from the center of the rotating body. .

  According to the present invention, when sealing a workpiece to be sealed one after another, it is not necessary to install a plurality of convex portions (anvils) on the outer peripheral surface of the rotating body, and the entire outer peripheral surface of the plurality of convex portions is eliminated. Therefore, high-precision polishing for forming on the same arc concentric with the center of the rotating body is also unnecessary. And the seal head and the head facing part are interlocked with each other to repeat the forward movement and the backward movement, and the workpiece is transported at a high speed because it moves while moving with the workpiece while sandwiching the workpiece to be sealed by both forward movements. However, a certain sealing time can be secured, and the reliability of the sealing performance during high-speed conveyance is increased.

The front view which shows simply one Example of this invention. The side view. The front view which shows the mechanism part of FIG.1 and FIG.2 simply. The front view which shows the modification of FIG. 3A. FIG. 4 is a front view showing a traveling trajectory of an anvil's outward path and a return path in FIG. 3. The front view which shows the drive mechanism which concerns on the anvil of FIG. 6 is a simplified side cross-sectional view of the inside of a rotating body including the drive mechanism of FIG. The front view which shows the vicinity of the drive motor of the anvil of FIG. The perspective view which shows the opening part of the rotary body which an anvil exposes outside. The top view of the part. The front view which shows the motion of an ultrasonic horn and an anvil. The figure which shows the example of protrusion of the surface of an anvil. The figure which shows Example 1 of the movement locus | trajectory of an ultrasonic horn and an anvil. The figure which shows Example 2 of the movement locus | trajectory of an ultrasonic horn and an anvil. The figure which shows the modification of the mechanism which circulates an anvil. FIG. 15 is a simplified cross-sectional view of the mechanism of FIG. 14. The figure which shows an example of a to-be-sealed workpiece. The top view which shows the top view of a to-be-sealed 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 Example 3 of the movement locus | trajectory of an ultrasonic horn and an anvil. The figure which shows Example 4 of the movement locus | trajectory of an ultrasonic horn and an anvil. The figure which shows Example 5 of the movement locus | trajectory of an ultrasonic horn and an anvil. The front view corresponding to FIG. 1 which added the cam which provides a circular locus to an ultrasonic horn. The figure which shows simply the positional relationship of the roll and cam in FIG. The principal part side view of FIG. The figure which shows Example 1 of the cam attached to the roll. The figure which shows Example 2 of the cam attached to the roll. The figure which shows Example 3 of the cam attached to the roll. The figure which shows Example 1 of the cyclic locus provided to an ultrasonic horn. The figure which shows the example 2 of a patrol locus | path similarly. The figure which shows the example 3 of a patrol locus similarly. The figure which similarly shows the example 4 of a cyclic locus. The figure which shows the example 5 of a patrol locus similarly. The figure which shows the example 6 of a patrol locus similarly. The figure which shows the example 7 of a cyclic locus similarly. 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 cam member and cam groove which circulates an ultrasonic horn. 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 sealing (joining) apparatus as a sealing apparatus shown in FIG. 1 includes a roll 1 as a rotating body that takes a continuous belt-like (longitudinal) work 26 as a work to be sealed and conveys it, and a roll 1 is provided with an ultrasonic unit 5 including an ultrasonic horn 3 and an ultrasonic generator 4 facing the outer peripheral surface. The ultrasonic horn 3 mainly functions as a seal head. The roll 1 is rotatably supported by a support 7 on the ground surface by a rotating shaft 6 at the center thereof, and is rotated 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 is swingable about one axis, and the ultrasonic unit 5 is also connected to the rotation center of the roll 1 via the support portion 10. Swings around a concentric centerline.

  A crank portion 15 is connected to the support portion 10 of FIG. The crank portion 15 is rotationally driven around a central axis by a motor 16 as a driving device, and causes the support portion 10 and the arm 11 to perform a reciprocating arc motion (pendulum motion) via a connecting portion 14 that is eccentrically connected to the crank portion 15. . Note that the motor 16 that drives the crank portion 15 and the motor 8 that drives the roll 1 are not separate motors, but a common motor is used, and the drive of this motor is distributed between the roll 1 and the crank portion 15, and a predetermined motor is used. Can also be synchronized.

  FIG. 2 is a simplified side view of FIG. 1, and the roll 1 is rotatably supported by the support 7 on both sides via the shaft 6 as described above, and the base end portion of the arm 11 is a bearing with respect to the shaft 6. 11a is supported so as to be able to swing (turnable 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.

  Next, with reference to FIG. 3A and the like, the anvil 2 serving as a head facing portion with respect to the ultrasonic horn 3 as a seal head will be described. The anvil 2 is in a pressed state with a workpiece sandwiched between it and the ultrasonic horn 3, and ultrasonic vibrations (heater heating in the case of heat sealing) are applied in the sandwiched state, whereby a predetermined seal portion is formed. The

  As shown in FIG. 11, for example, two rows of protrusion groups 2 a for forming a seal pattern are formed on the surface of the anvil 2, (A) is a spread form on one side, and (B) is a parallel form. As will be described later, the seal pattern is applied to the overlapped sheet-like workpiece 26 to form the seal portion 32. For example, as shown in FIGS. 16 and 17, the sheet-like workpiece 26 is pasted at a predetermined interval so that the water absorbing member 29 crosses between the first sheet portion 27 and the second sheet portion 28. An object is folded in half, and such a sheet-like workpiece 26 is supplied to the roll 1 via the conveying roll 30 in FIG. 1 and sealed by the ultrasonic horn 3 and the anvil 2 in FIG. A cutting line 33 is scheduled between each of the two seal portions 32 (FIG. 17), and the sheet-like workpiece 26 is separated into individual products or intermediate products 34 (disposable paper diapers, etc.) by cutting at each cutting line 33. Will be. The cutting is performed by feeding the sheet-like workpiece 26 to a downstream process (such as a cutting process) via the transport roll 31 of FIG.

  As a form of the sheet-like workpiece, for example, as shown in FIG. 18, a sheet-like workpiece in which the 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 (disposable disposable diapers or the like). The seal line 32 differs depending on whether the projection group 2a in FIG. 11A or 11B is parallel or widened, but if it is a widened seal line, for example, the waist part of the disposable paper diaper is inclined. It becomes. In FIG. 19, such a sheet-like workpiece 26 or 38 is supplied to the 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.

  Returning to FIG. 3A, the anvil 2 is supported by an anvil arm 45 as a rocking body, and protrudes from the tip of the anvil arm 45 so as to be able to face the ultrasonic horn 3. The anvil arm 45 is supported so as to be able to oscillate about a oscillating shaft at a certain distance from the ultrasonic horn 3, and in this example, the rotating shaft 6 of the roll 1 also serves as the oscillating shaft. The anvil arm 45 is connected to the crank plate 50 via a connecting portion 49, the crank portion 50 is rotated by a motor 51 as a driving means, and the rotation is transmitted to the anvil arm 45 by the connecting portion 49. The anvil 2 supported by the arm 45 is also oscillated within a predetermined angle range.

  The anvil 2 is held by the arm 45 via a linear guide 46 so as to be movable in the longitudinal direction of the arm 45 (a direction away from and approaching the rotating shaft 6 of the roll 1), and is supported by an elastic member such as a spring 47. It is biased in a direction away from 6, in other words, a direction protruding from the outer periphery of the roll 1. Further, the anvil 2 is provided with a cam follower 48 (a side surface of the anvil 2 protrudes). The cam follower 48 is fitted into a laterally looped cam groove 52 shown in FIG. 4, and the anvil arm 45 accompanying the rotation of the crank portion 50 shown in FIG. The anvil 2 moves along the cam groove 52 in accordance with the rocking motion.

  The cam groove 52 has a cam curve that circulates as a whole with a forward path 52a, a return path 52b, and connecting portions 52c and 52d (smooth corner portions or turned-back portions that cause a dead point to be folded back) that connect them on both sides. Form. The forward path 52a is formed in a convex curve shape that is convex outward of the roll 1, and the curvature thereof can be, for example, along an arc centered on the axis of the rotation axis 6 of the roll 1, as shown in FIG. 3A. The curvature of the arc that is the reciprocal movement trajectory of the ultrasonic horn 3 can be made to correspond. The cam curve of the return path 52b in FIG. 4 may be, for example, an arc shape that protrudes outward to the same extent as the forward path 52a, an arc shape that is concave outward, or a linear shape that is neither convex nor concave. . 3 and FIG. 5 urges the anvil 2 outward, and rattling is unlikely to occur between the cam follower 48 and the cam groove 52 when the anvil 2 is cyclically moved (swinged). However, if the fitting accuracy between the two is high, the spring 47 may be omitted.

  The cam groove 52 is formed in the cam plate 53, and the cam plate 53 is fixed to a non-rotating portion inside the roll 1 directly or via a bracket (fixing member). As shown in FIG. 6, the roll 1 has a hollow shape inside, for example, a cylindrical shape in which one side end is closed and the other side end is opened to the side, and is closed. One side end is fixed to the rotating shaft 6, and the rotating shaft 6 is rotatably supported by the abutment 7 via a bearing 6a. An extension 54 extends from one abutment 7 supporting the rotating shaft 6 toward the inner space of the roll 1, and a cam plate 53 is formed integrally with the extension 54, or a separate cam plate 53. Is fixed at a substantially right angle to the rotating shaft 6. The extension 54 approaches the anvil arm 45 along the rotation shaft 6, makes the cam plate 53 face the side surface of the anvil 2, and the cam follower 48 of the anvil 2 engages with the cam groove 52 of the cam plate 53.

  A motor 51 that swings the anvil arm 45, a crank portion 50, and a connecting portion 49 are also incorporated in the hollow portion of the roll 1, and the motor 51 is installed on the abutment 7 via a fixed base 53. The anvil arm 45 is swingably supported inside the roll 1 via the bearing 45a and does not hinder the rotation of the roll 1. An extension 54 extending from the abutment 7, a cam plate 53 supported by the extension 7, a motor 51 for swinging the anvil arm 45, a crank part 50, a connecting part 49, and the like are also housed in the hollow roll 1. There is no hindrance to rotation.

  The outer cylindrical portion 1a of the hollow cylindrical roll 1 is formed with one or a plurality of (in this example, four as shown in FIG. 3A) openings 55 (spaces) at equal angular intervals. As shown in FIGS. 8 to 9, a width larger than the depth dimension of the anvil 2 (dimension parallel to the axial direction of the roll 1) so as to have a predetermined length L along the cylindrical outer periphery of the roll 1. For example, a rectangular shape is formed so as to include W. The anvil 2 can project or be exposed outward from these openings 55, and the process of the anvil 2 moving through the forward path 52 a from the connection portion 52 c that is the starting point of the cam groove 52 shown in FIG. 4 or the like via the cam follower 48 ( In the course of the forward path), the anvil 2 is lifted (lifted or floated) so as to protrude or be exposed upward from an arbitrary opening 55, and the anvil 2 moves in the connecting portion 52d of the cam groove 52 and the return path 52b. The anvil 2 descends so as to retract into the roll 1 from the opening 55, and returns and moves in a state of being retracted from the outer periphery of the roll 1.

  As shown in FIG. 10, the forward movement in the swing (circulating motion) of the anvil 2 and the forward movement in the swing (reciprocal arc motion) of the ultrasonic horn 3 are both moved along an arc shape. On the other hand, the return movements of the two are separated from each other (with respect to the ultrasonic horn 3 that moves in a simple reciprocating circular arc, the anvil 2 is separated inward), and returns to the original position, and thereafter this cycle. repeat. This one-round cycle is executed in a rotating state of the roll 1 that conveys the sheet-like workpiece 26 while being entangled with the roll 1 by rotating the roll 1.

  3A, during the rotation of the roll 1, when the arbitrary opening 55 of the roll 1 approaches the swing region of the anvil 2, the forward swing of the anvil arm 45 (same as the rotation direction of the roll 1 in FIG. 3A). The anvil 2 floats outward from the opening 55 by the cam groove 52, and the anvil 2 is connected to the ultrasonic horn 3 while sandwiching the sheet-like workpiece 26 between the ultrasonic horn 3 and the cam horn 52. While moving in the forward direction together with the opening 55 of the roll 1 and the work 26, sealing by ultrasonic waves (welding by vibration heat generation) is performed. After the sealing, the anvil 2 is retracted from the opening 55 by the cam groove 52 and the inner side of the outer peripheral cylindrical portion 1a where the opening 55 of the roll 1 does not exist is transferred to the roll 1 in the process in which the anvil arm 45 turns from the forward path to the return path. Oscillates (reverses) in the direction opposite to the direction of rotation of the motor and returns to the original position.

  Further, when the opening 55 positioned next to the roll 1 approaches, the forward movement of the anvil arm 45 occurs as described above, and the same is repeated thereafter. The workpiece 26 is sandwiched between the ultrasonic horn 3 and the anvil 2 (synchronized movement) between the ultrasonic horn 3 and the anvil 2 and the sealing is performed one after another. Here, the sealing time can be increased in the process of moving the ultrasonic horn 3 and the anvil in the forward direction, and the reliability of the seal is ensured even during high-speed conveyance of the workpiece 26. A plurality of anvils 2 are not fixed to the outer peripheral surface of the roll 1 at equal intervals. For example, one anvil 2 swings relative to the roll 1 and participates in all seals. It is easy to adjust and manage the gap between the anvil 2 and the ultrasonic horn 3 necessary for ensuring uniformity, and it is easy to avoid variations in seal performance for a plurality of seal portions.

  In order to operate the roll 1, the anvil 2, and the ultrasonic horn 3 in cooperation with each other as described above, the rotation phase of the roll 1 and the oscillation period of the anvil arm 45 and the horn arm 11 are synchronized. This control is performed by the control unit 57 that controls the motor 8 that rotates the roll 1, the motor 51 that swings the anvil arm 45, and the motor 16 that swings the horn arm 11 in association with each other.

  In addition, the outer peripheral surface of the anvil 2 can be formed, for example along the circular arc centering on the centerline of the roll 1, and the projection group 2a shown in FIG. 11 protrudes from the circular-arc outer peripheral surface. In that case, the arc-shaped outer surface of the anvil 2 follows the moving arc of the ultrasonic horn 3. Further, the speed in the reciprocating arc motion of the ultrasonic horn 3 is slow (or zero) at the base end in a sine curve, fast at the middle, and slow (or zero) at the end. Further, the anvil 2 that oscillates cyclically also moves at a non-constant speed similar to the ultrasonic horn 2. Since the moving speeds of the anvil 2 and the ultrasonic horn 3 are approximately approximate, relative movement between the two is negligible, but the anvil 2 is moved relative to the roll 1 (opening 55) and the work 26 that move at a constant speed. 2 and the ultrasonic horn 3 move relatively in the swing range. That is, the anvil 2 moves relatively in the length direction in the opening 55, the ultrasonic horn 2 moves on the surface of the workpiece 26, and the anvil 2 moves on the back surface of the workpiece 26 to some extent, while the two protrusion groups The workpiece 26 is pressed and joined (seal) 2a.

  In FIG. 3A, the drive device (the connecting portion 49, the crank portion 15, the motor 16) that swings the ultrasonic horn 3 (horn arm 11) and the drive device (the connecting portion 49) that swings the anvil 2 (anvil arm 45). , The crank portion 50 and the motor 51) are provided separately from each other, but the horn arm 11 and the anvil arm 45 are configured to swing integrally, and a swinging means (single) common to them (single). A driving device) may be provided. For example, as shown in FIG. 3B, the drive device that swings the anvil arm 45 is omitted, and only the drive device that swings the horn arm 11 is provided, or the drive device that swings the horn arm 11 is omitted in FIG. 3A. Alternatively, only the driving device that swings the anvil arm 45 may be provided to swing the horn arm 11 and the anvil arm 45 integrally. In other words, a common (one) driving device is used that combines the seal head driving device of the ultrasonic horn 3 and the head-opposing driving device of the anvil 2. In this way, it is possible to easily synchronize the swings of the arms 11 and 45, and consequently the swings of the ultrasonic horn 3 and the anvil 2.

  In the above description, as shown in FIG. 12, the anvil 2 performs a reciprocating circular motion by the anvil arm 45 and the cam groove 52, and the ultrasonic horn 3 performs a reciprocating arc motion by the horn arm 11. In the example shown in FIG. 13, the horn 3 has a simple reciprocating arc motion, while the anvil 2 has a circular trajectory, but both ends of the rocking motion are shown. Is not a smooth trajectory, but a trajectory having an acute turn-around point where a dead point occurs at both ends of the swing can be given to the anvil 2.

  In order to impart the movement of FIG. 13 to the anvil 2, instead of the cam groove 52 described above, a block-shaped cam 60 is provided on the inner surface of the outer peripheral cylindrical portion 1a of the roll 1 as shown in FIG. A cam surface 61 constituted by the side portions of the anvil 2 faces the cam follower 61 provided on the side surface of the anvil 2. The anvil 2 is incorporated into the tip of the anvil arm 11 and is urged by an elastic member such as a spring 47 in a direction protruding from the outer periphery of the roll 1. When the cam 60 passes through the anvil 2, the preceding cam surface 61 a is cam follower. Through 62, the anvil 2 is pushed down in the direction of retreating from the outer periphery of the roll 1 against the urging force of the spring 47.

  In this example, the number of cams 60 corresponds to the number of openings 55 formed in the roll 1 (for example, four), equiangular intervals on the circumference of the roll 1, and between the openings 55 in the circumferential direction. Or a part of the position of each opening 55 (overlap). The cam surface 61 of the cam 60 is formed on one side (61a) of the cam surface 61 if the amount of protrusion from the inner surface of the outer peripheral cylindrical portion 1a of the roll 1 is inward (direction approaching the center line of the roll 1) is the cam height. ), The cam height gradually increases, does not change much at the intermediate portion (61b), and gradually decreases on the other side (61c).

  When the anvil 2 starts swinging in the forward direction by the arm 11 and approaches the opening 55, the cam follower 62 of the anvil 2 is in the vicinity of the cam surface 61c of the cam 60, and the cam 60 does not exist. When the cam follower 62 responds, the anvil 2 is pushed out by the spring 47 and protrudes from the opening 55 of the rotating roll 1, and the horn 3, the opening 55 of the roll 1, and the work are sandwiched with the ultrasonic horn 3. 26 moves in the forward direction, and sealing with ultrasonic waves is performed over a predetermined time during the forward movement.

  After the sealing, when the anvil 2 starts to move in the backward direction by the arm 45, the cam 60 following the rotating roll 1 reaches the anvil 2, and the cam surface 61a on the leading side moves the cam follower 62 of the anvil 2 to the spring 47. By pushing down against the spring force, the anvil 2 is retracted so as to be retracted from the opening 55, and the anvil 2 dives inside the outer peripheral cylindrical portion 1 a of the roll 1 and swings in the opposite direction to the roll 1 (recovery). Move). When the anvil 2 turns from its backward movement to the forward movement, the cam follower 62 is positioned in the vicinity of the cam surface 61c so as to be detached from the cam 62, and the face is exposed from the opening 55 that comes next to the rotating roll 1. Then, it is pushed out by the spring 47 and thereafter the same operation as above is repeated. 15A and 15B, when the cam follower 62 of the anvil 2 is detached from the cam 60, the cam follower 62 of the anvil 2 is applied to the inner peripheral surface 63 of the outer peripheral cylindrical portion 1a of the roll 1, The amount of protrusion of the anvil 2 may be regulated, or the amount of protrusion of the anvil 2 may be determined by applying the stopper facing portion 65 provided on the anvil 2 to the stopper 64 formed on the anvil arm 45 as shown in FIG. May be regulated. Further, the plurality of cams 60 in the figure can be replaced with one cam ring that is continuous in an annular shape.

  The above is an example in which the anvil 2 and the ultrasonic horn 3 are swung synchronously as shown in FIG. 13, but as shown in FIGS. 20A to 20C, the anvil 2 has the movement locus shown in FIG. 12 or 13. On the other hand, the ultrasonic horn 3 is not a reciprocal arc trajectory, and the forward path is a simple arc motion by the arm 11, but the return path can give the horn 3 a return path away from the outer peripheral surface of the roll 1 than the forward path trajectory. This can eliminate or reduce the horn 3 coming into contact (interference) with the workpiece 26 and rubbing the surface of the horn 3 in the return path of the horn 3, and is effective in avoiding a decline in commercial value due to the rubbing or the like.

An example of a mechanism for giving such a forward path and a return path to the ultrasonic horn 3 will be described.
In FIG. 21, 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 roll 1. In this example, the ultrasonic unit 5 is attached to the support portion 10 by a linear guide (linear bearing) 12. Slide in a predetermined range.

  The movement of the ultrasonic unit 5 in the direction approaching (for example, descending) the roll 1 is regulated by a stopper 13 provided in the support unit 10, and the movement of the ultrasonic horn 3 toward the roll 1 beyond a certain limit is prevented. The The support portion 10 is connected to the crank portion 15 via the connecting portion 14, and the support portion 10 and the arm 11 perform a reciprocating arc motion (pendulum motion) by a motor 16 that is a driving means thereof.

  A plurality of cams 18 are provided on the outer periphery of the roll 1 so as to protrude from the outer periphery of the roll 1 (see also FIG. 22), and the ultrasonic unit 5 is provided with a cam follower 19 for these cams 18. The cam follower 19 rises and falls according to the cam curve of each cam 18 in a direction approaching and separating from the outer periphery of the roll 1 by climbing on and exceeding each cam 18 as the roll 1 rotates.

  FIG. 23 is an enlarged side view showing the vicinity of the ultrasonic unit 5. The cam 18 is fixed to the end surface of the roll 1, and the cam surface protrudes from the outer periphery of the roll 1 so that it 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, and does not interfere with the overlapped sheet portion (work) sandwiched between the ultrasonic horn 3 and the anvil 2. It is like that.

  In a state in which the cam follower 19 rides on the cam 18, the ultrasonic unit 5 rises upward in FIG. 23, and the ultrasonic unit 5 is provided with the stopper facing part 21 on the support part 10 and separated from the stopper 13 described above. It becomes a 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 is not restrained by the cam 18 and is lowered in FIG. 23, but its movement limit is the support portion 10. When the stopper facing portion 21 of the ultrasonic unit 5 is brought into contact with the above-described stopper 13 provided in FIG. 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.

  FIG. 24 shows 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 roll 1 by a bolt hole 25 and fastening means such as a bolt (not shown). The cam surface 24 in this example protrudes from the outer peripheral surface of the roll 1 and comes into contact with the cam follower 19 on the ultrasonic unit 5 side, but as a whole resembles a flat trapezoidal shape and rises from the right side in the figure. (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 (FIG. 25) or an arcuate surface that is convex toward the outside of the anvil roll 1 (FIG. 26). An arcuate curved surface with a small curvature that is concave with respect to the outside is formed (FIG. 24).

  The cam follower 19 is moved by the arm 11 along the outer peripheral arc of the roll 1, and the top cam surface 24 b is formed in a concave shape, so that the locus of the cam follower 19 becomes 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 roll 1 is shown. ing. As shown in FIG. 27, the movement of the cam follower 19 (and hence the ultrasonic horn 3) is combined with the movement given to the cam follower 19 by 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 an arc centered on the center line of the roll 1 from the right in the figure, and a return trajectory B that returns to the original position following the forward trajectory A are provided, The connecting portion between the forward direction trajectory A and the return direction trajectory B can be a relatively small arc-shaped corner portion, and most or middle part of the return direction trajectory B is a linear trajectory, An inclined trajectory.

  FIG. 28 shows an example in which the forward trajectory A is the same as that in FIG. 27, and the return direction trajectory B1 occupies most of the straight portion, and the folded portion becomes a relatively large arcuate corner portion. In FIG. 29, the forward trajectory A is turned back at its end, and after returning by a certain amount along the same arc, the trajectory rises to a straight portion and descends to a return trajectory B2 connected 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 FIG. 27 to FIG. 29, it can be said that the ultrasonic horn moves along a circular trajectory in the sense that it always passes another trajectory in the forward direction and the return direction.

  In addition, as shown in FIGS. 30 to 33, it is also possible to use return direction trajectories B3 to B6 having a circular arc shape that protrudes outward with respect to the forward trajectory A in the same manner. . In this case, the top cam surface 24b shown in FIG. 24 may be linear (FIG. 25) or loosely arcuate (FIG. 26) protruding outward.

  FIG. 34 shows the relative positional relationship between the cam 18 and both ends P1, P2 of the reciprocating arc locus of the ultrasonic horn 3 provided by the swing arm 11. For example, as shown in FIG. 2C, when the leading end C1 of the cam 18 passes the cam follower 19 before the ultrasonic horn 3 reaches the swing end P2, when the horn 3 reaches the moving end P2. The leading end C1 of the cam 18 enters the outside of the swing range of the horn 3 (the side away from the other swinging end P1) (preceding / passing), and before the cam follower 19 reaches the swinging end P2, the cam 18 The horn 3 gets on and starts to separate from the outer peripheral surface of the anvil roll 1. In this case, the circular trajectories of FIGS. 27 to 28 and FIGS. 30 to 31 are given to the horn 3. As shown in FIG. 34B, when the leading end C1 of the cam 18 cannot catch up with the cam follower 19 until the horn 3 reaches the swinging end P2, the leading end of the cam 18 with respect to the swinging end P2. The part C1 is inside the swinging range (near side near the swinging end P1) (following), and the ultrasonic horn 3 reaches P2 from P1 and folds back on the cam 18 on the way back to P1. 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. 29 and 32 is given to the ultrasonic horn 3. As shown in FIG. 34A, in the case of synchronous arrival where the moving end P2 of the ultrasonic horn 3 coincides with the leading end C1 of the cam 18, a circular locus as shown in FIG. 33 is obtained. As described above, the forward trajectory A depends on whether the leading end C1 of the cam 18 overshoots so as to enter the outside of the horn swinging end P2 (+ y) or stops inside (near) (-y). The trajectory shape of the turn-back portion of the return direction trajectory B that follows is determined.

  The forward direction process of the ultrasonic horn 3 is applied by the horn arm 11 and the return process is applied by the cam 18 fixed to the anvil roll 1, and there are other methods and forms. As an example, as shown in FIG. 35, a fixed cam member 40 is provided, and a cam groove 41 corresponding to a circular trajectory 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. 36, 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, thereby A movement trajectory can be directly given to the sonic horn 3. A locus corresponding to this cam groove 42 can be formed corresponding to FIGS. In the example of FIG. 35, an arc-shaped forward trajectory A along the outer peripheral surface of the roll 1 and a return direction trajectory B mainly composed of a linear portion or an arc-shaped portion following the arc-shaped forward trajectory A are provided. It is assumed to be a continuous corner part or a folded part that turns back to an acute angle.

  The premise that the horn arm 11 is swung by the crank 15 or the like is not necessarily essential. For example, as shown in FIG. 37, the support unit 10 is supported by a linear or arcuate fixed guide 43 provided on a fixed member so as to be reciprocally movable (slidable). 5 is supported so as to be able to approach and separate from the outer peripheral surface of the roll 1, and the support portion 10 is reciprocated by the crank portion 15. Assuming this, the horn arm 11 is not necessary. Then, the cam follower 42 on the ultrasonic unit 5 side engages with the cam groove 41 formed in the fixed cam member 40 as shown in FIG.

  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. For example, although an ultrasonic horn has been exemplified as the above-described seal head, the present invention can also be applied to a heat seal apparatus that heat-welds a heeled part by heating a heater.

1 roll (rotating body)
2 Anvil (head facing part)
3 Ultrasonic horn (seal head)
Reference Signs List 4 Ultrasonic generator 5 Ultrasonic unit 10 Support section 11 Horn arm 14 Connection section 15 Crank section 16 Motor (seal head drive device)
18 Cam 19 Cam follower 24 Cam surface 26, 38 Sheet-like workpiece (sealed workpiece)
27 1st sheet | seat part (sealed part)
28 Second sheet portion (sealed portion)
29, 36 Water absorbing member 32 Seal wire 33 Cutting line 45 Anvil arms 48, 62 Cam follower 49 Connecting portion 50 Crank portion 51 Motor (head facing portion drive device)
52 Cam groove 55 Opening (space)
60 Cam 61 Cam surface

Claims (4)

A sealing device for joining a sealed portion of a flexible continuous or discontinuous sealed workpiece having heat welding property by heat,
A rotating body driven to convey the work to be sealed;
A seal head that opposes the outer peripheral surface of the rotating body through the work to be sealed and applies heat for sealing to the work to be sealed;
A seal head driving device that repeatedly moves the seal head in the forward direction with respect to the conveyance of the work to be sealed, and repeats moving in the reverse direction in the reverse direction;
The workpiece to be sealed can be sandwiched between the seal head and incorporated in the rotating body in a state in which forward movement in the forward direction and backward movement in the return direction are possible with respect to the conveyance of the belt-like workpiece. A head facing portion;
A head facing portion driving device that moves the head facing portion in the forward and backward directions in conjunction with the forward and backward movements of the seal head and provides a locus for sandwiching the workpiece to be sealed with the seal head in the forward motion. And comprising
The sealing device is characterized in that sealing is performed in a state where both of the seal head and the head facing portion move in the forward path while holding the work to be sealed, and the same sealing operation is repeated after both of them move in the backward path.   The head facing portion is given a forward trajectory that approaches the seal head side from the space formed in the outer peripheral portion of the rotating body in the forward movement and moves in the forward direction together with the seal head, and in the backward movement. The sealing device according to claim 1, wherein a return direction trajectory that moves by shifting from the forward trajectory toward the center of the rotating body is provided.   3. The sealing device according to claim 1, wherein the seal head is provided with the same circular reciprocating locus along the outer peripheral surface of the rotating body as a forward direction trajectory of the forward movement and a return direction trajectory of the backward movement.   The seal head is given an arc-shaped forward trajectory along the outer peripheral surface of the rotating body in the forward movement, and moves in a backward direction away from the center of the rotating body in the backward movement. The sealing device according to claim 1, wherein a return direction trajectory is provided.

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