JP2021020708A - Sealing device, packaging device and anvil - Google Patents

Abstract

To provide a sealing device capable of suppressing damage of an anvil and a horn for ultrasonic welding, and the packaging device and the anvil.SOLUTION: A sealing device 10 comprises an ultrasonic welding anvil 16 which is rotatable and has a disk shape, a horn 15 which is abutted on an outer peripheral surface of the anvil 16 through an overlapped part 5 of a film 4, and an ultrasonic generator 14 which vibrates the horn 15. On the outer peripheral surface of the anvil 16, a groove 16a inclined in the axial direction and the circumferential direction is formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device for sealing a film and a packaging device including the same, and also relates to an anvil for ultrasonic welding used in the sealing device.

Patent Document 1 discloses a sealing device that vertically seals an overlapping portion of films rolled into a tubular shape (see FIG. 7 of Patent Document 1). This sealing device employs ultrasonic welding technology. Specifically, the outer peripheral surface of the disk-shaped anvil roller is abutted against the tip of the ultrasonic horn via the film overlapping portion. The film is conveyed by rotationally driving the anvil roller by the driving means, and the superposed portion is welded by the frictional heat generated by the ultrasonic vibration of the ultrasonic horn. Further, a notch parallel to the axial direction is formed on the outer peripheral surface of the anvil roller.

Japanese Unexamined Patent Publication No. 2003-128020

However, in the technique disclosed in Patent Document 1, since the cylindrical surface is interrupted at the portion where the notch is formed, when the notch passes through the abutting portion with the horn, the edges on both sides of the notch collide with the horn. To do. After that, the line contact time until the edge separates from the horn becomes long, and the ultrasonic vibration energy is locally concentrated on the edge. Therefore, the edges on both sides of the notch, the horn, and the anvil roller are easily damaged.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to suppress damage to anvils and horns worn by ultrasonic welding.

In order to solve the above problems, a groove diagonal to the axial direction and the circumferential direction is formed on the outer peripheral surface of the rotating disk-shaped ultrasonic welding anvil.
Further, the sealing device includes the anvil, a horn that is abutted against the outer peripheral surface of the anvil via a film overlapping portion, and an ultrasonic generator that vibrates the horn.
Further, the packaging device includes the sealing device and wraps the object to be packaged by the film sealed by the sealing device.

According to the above, even when the groove passes through the portion where the outer peripheral surface of the anvil and the horn abut each other, the outer peripheral surface of the anvil always makes line contact with the horn, and the line contact portion makes a groove diagonally with respect to the groove. Crossing. Therefore, the behavior that the edges on both sides of the groove collide with the horn does not occur. Further, the ultrasonic vibration energy is distributed to the line contact portion and is not concentrated on the edges on both sides of the groove. Therefore, damage to the anvil and the horn can be suppressed.

According to the present invention, damage to the anvil and the horn can be suppressed, and no abnormal noise is generated.

It is a front view of the vertical sealing device. It is a side view of the pillow packaging apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments and illustrated examples because the embodiments described below are provided with various technically preferable limitations for carrying out the present invention.

1. 1. Vertical Sealing Device FIG. 1 is a front view of the vertical sealing device 10.
The resin film 4 is conveyed in a direction perpendicular to the paper surface of FIG. 1 by a roller or the like, and continuously passes through the vertical sealing device 10. Then, the overlapping portion 5 of the film 4 is vertically sealed by the vertical sealing device 10. Here, the vertical direction is the transport direction of the film 4 and is the direction perpendicular to the paper surface of FIG. The overlapped portion 5 may be a portion where two films 4 are overlapped, or a portion where both side portions of the film 4 are overlapped by being rolled into a tubular shape. ..

The vertical sealing device 10 includes a machine frame 11, a drive mechanism 12, an actuator 13, an ultrasonic generator 14, a horn 15, and an anvil 16.

The drive mechanism 12 includes a motor 12a, sector gears 12b, 12c, spur gears 12d, 12e, 12f, universal joints 12g, 12h, and a connecting shaft 12i. The motor 12a is attached to the machine frame 11. A sector gear 12b is coaxially attached to the output shaft of the motor 12a. The sector gear 12c meshes with the sector gear 12b. The sector gear 12c is coaxially connected to the spur gear 12d by a rotating shaft, and the sector gear 12c and the spur gear 12d are rotatably attached to the machine frame 11. The spur gear 12d meshes with the spur gear 12e, and the spur gear 12e meshes with the spur gear 12f. The spur gear 12e is connected to one end of the universal joint 12g, the other end of the universal joint 12g is connected to one end of the universal joint 12h, and the other end of the universal joint 12h is connected to one end of the connecting shaft 12i. The universal joint 12h and the connecting shaft 12i are rotatably attached to the machine frame 11 via the guide 18. Further, the universal joint 12h and the connecting shaft 12i are provided by the guide 18 so as to be movable in a direction orthogonal to the axis of the connecting shaft 12i, that is, in the direction indicated by the arrow in FIG. Hereinafter, the direction indicated by the arrow in FIG. 1 is referred to as a lateral direction.

The connecting shaft 12i is rotatably attached to the output portion (for example, plunger, piston, rod, etc.) 13a of the actuator 13 by a bearing. The actuator 13 is attached to the machine frame 11. The actuator 13 is, for example, an air cylinder or an electromagnetic solenoid. The actuator 13 moves the connecting shaft 12i laterally.

The other end of the connecting shaft 12i is fixed to the disk-shaped anvil 16, and the anvil 16 and the connecting shaft 12i are provided coaxially. The anvil 16 is rotationally driven by the drive mechanism 12.

One or more grooves 16a are formed on the outer peripheral surface of the anvil 16. The groove 16a is oblique with respect to the circumferential direction and the axial direction. The groove 16a is open on one end surface 16c and the other end surface 16d of the anvil 16. The opening 160a on the one end surface 16c of the groove 16a is offset from the opening 161a on the other end surface 16d with a predetermined offset in the circumferential direction, and the opening 160a and the opening 160b do not overlap in the axial direction.
When the number of grooves 16a is plural, these grooves 16a are arranged at equal pitches in the circumferential direction. The pitch can be set as appropriate.

The ultrasonic generator 14 is a rod-shaped shaft body. An oscillator 14a is provided at the base end of the ultrasonic generator 14, and a booster 14b is provided at the tip of the ultrasonic generator 14. When a high frequency electric signal is supplied to the oscillator 14a, the oscillator 14a vibrates at a high frequency. The vibration of the vibrator 14a is transmitted to the booster 14b, and the amplitude is amplified by the booster 14b.

The ultrasonic generator 14 is rotatably attached to the machine frame 11 by a bearing, and the axis of the ultrasonic generator 14 and the axis of the connecting shaft 12i are parallel to each other. The base end portion of the ultrasonic generator 14 is coaxially attached to the spur gear 12f, and the ultrasonic generator 14 is rotationally driven by the drive mechanism 12.

The horn 15 is provided in a disk shape. The center of the horn 15 is fixed to the tip of the ultrasonic generator 14, and the horn 15 and the ultrasonic generator 14 are provided coaxially. When the vibration amplified by the booster 14b of the ultrasonic generator 14 is transmitted to the horn 15, the horn 15 vibrates at a high frequency so as to slightly expand / contract in the radial direction. The horn 15 may vibrate in the lateral direction.

When the actuator 13 retracts the output portion 13a, the outer peripheral surface of the anvil 16 is separated from the outer peripheral surface of the horn 15. On the other hand, when the actuator 13 advances its output, the outer peripheral surface of the anvil 16 approaches the outer peripheral surface of the horn 15, and the outer peripheral surface of the anvil 16 abuts on the outer peripheral surface of the horn 15 via the overlapping portion 5 of the film 4. .. A predetermined pressing force is applied by the actuator 13 to the overlapping portion 5 sandwiched between the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15.

When the motor 12a operates with the overlapping portion 5 of the film 4 sandwiched between the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15, the anvil 16 and the horn 15 rotate at equal peripheral speeds. As a result, the film 4 is conveyed.

Further, when the ultrasonic generator 14 vibrates the horn 15 at a high frequency, frictional heat is generated in the overlapping portion 5 sandwiched between the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15. As a result, the overlapping portion 5 is welded and sealed.

Here, when the groove 16a passes through the portion where the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15 abut each other, the pressing force and the frictional heat are not applied to the superposed portion 5 in the groove 16a portion, and the groove 16a is not yet subjected to. A seal portion is formed. The unsealed portion functions as a vent.

Further, since the groove 16a is oblique with respect to the circumferential direction and the axial direction, the opening 160a and the opening 160b of the groove 16a do not overlap in the axial direction, so that the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15 The outer peripheral surface of the anvil 16 always makes line contact with the outer peripheral surface of the horn 15, and the line contact portion diagonally crosses the groove 16a with respect to the groove 16a even when the groove 16a passes through the portions where the two abuts against each other. Therefore, the outer peripheral surface of the horn 15 does not fall into the groove 16a, and the edges on both sides of the groove 16a do not collide with the outer peripheral surface of the horn 15. Further, the ultrasonic vibration energy is distributed to the line contact portion and is not concentrated on the edges on both sides of the groove 16a. Therefore, damage to the anvil 16 (particularly in the vicinity of the groove 16a) and the horn 15 can be suppressed. Further, when the groove 16a passes through the portion where the outer peripheral surface of the anvil 16 and the outer peripheral surface of the horn 15 abut each other, no abnormal noise is generated.

If the horn 15 abuts on the outer peripheral surface of the anvil 16 via the overlapping portion 5 of the film 4, it does not have to rotate. In this case, the horn 15 may vibrate at a high frequency in the lateral direction, and the shape of the horn 15 may be a shape other than a disk.

The above vertical sealing device 10 is provided in a pillow packaging device, a three-way sealing packaging device, a four-way sealing packaging device, and other packaging devices, and is used to seal the overlapped portion 5 of the film 4. The packaging device is a device that wraps the object to be packaged by the film 4 sealed by the vertical sealing device 10. Hereinafter, a pillow packaging device as an example will be described.

2. 2. Pillow packaging device FIG. 2 is a schematic side view of the pillow packaging device 1. As shown in FIG. 2, the pillow wrapping device 1 is a horizontal pillow wrapping device, and particularly a regular pillow wrapping device.

The pillow packaging device 1 is an device for sequentially producing the package 2 by sequentially packaging the object 3 to be packaged with the film 4. The packaged object 3 may be one article or a collection of a plurality of articles. The object to be packaged 3 may be placed on a tray, and in this case, the object to be packaged 3 is packaged together with the tray. In this pillow packaging device 1, the object to be packaged 3 and the package 2 are transported from the back to the front. Therefore, the upstream side of the flow of the packaged object 3 and the packaged object 2 to be transported is the rear side, and the downstream side is the front side.

The pillow packaging device 1 includes a bag making device (former) 20, a film feeder 30, a packaged object feeder 40, a belt conveyor 50, a carry-out belt conveyor 80, a vertical sealing device 10, a horizontal sealing device 70, and an upper holding device. 60 etc. are provided. The vertical sealing device 10 may be referred to as a center sealing device, and the horizontal sealing device 70 may be referred to as an end sealing device.

A film feeder 30 is provided above the bag making device 20. A transport table and a packaged object feeder 40 are provided behind the bag making device 20. A receiving plate and a vertical sealing device 10 are provided in front of the bag making device 20. A belt conveyor 50 and an upper holding device 60 are provided in front of the vertical sealing device 10. A carry-out belt conveyor 80 is provided in front of the belt conveyor 50, and a lateral sealing device 70 is provided between the carry-out belt conveyor 80 and the belt conveyor 50.

The packaged object supply machine 40 supplies the packaged object 3 on the transport table to the bag making device 20 at predetermined intervals. The packaged material feeder 40 is a push conveyor, and includes a plurality of sprockets (in FIG. 1, only the drive sprocket 41 installed on the most downstream side is shown), an endless chain 42, a plurality of push members 43, and a motor 44. .. The endless chain 42 has an endless shape and is hung on a plurality of sprockets, and the pushing member 43 is attached to the endless chain 42 at predetermined intervals. When the drive sprocket 41 is rotationally driven by the motor 44, the endless chain 42 travels. As the endless chain 42 travels, the pushing member 43 moves toward the drive sprocket 41 in a state of protruding onto the transport table through the slit of the transfer table. Therefore, the packaged object 3 on the transport table is pushed forward by the pushing member 43 from behind and sent.

The film feeder 30 includes a raw roll 31, a feed roller 32, a feed motor 33, and the like. A strip-shaped film 4 is wound around the original roll 31. The original roll 31 is set above the bag making device 20. The film 4 unwound from the original roll 31 is guided to the bag making device 20 via the feed roller 32. When the feed motor 33 rotationally drives the feed roller 32, the film 4 is pulled out from the original roll 31. As a result, the film 4 is continuously supplied to the bag making device 20. The film 4 may be fed out from the raw fabric roll 31 by driving the raw fabric roll 31 by the feed motor 33.

When the film 4 supplied by the film feeder 30 passes through the bag making device 20, the overlapping portions 5 on both sides of the film 4 are bent downward by the bag making device 20, and the film 4 is made into the bag making device. It is rolled into a cylinder by 20. When the film 4 is rolled into a tubular shape, the object to be packaged 3 supplied to the bag making device 20 is wrapped in the film 4. The overlapping portion 5 is formed in a fin shape so as to hang down by the bag making device 20, and projects below the receiving plate through the slit of the receiving plate.

On the downstream side of the bag making device 20, the tubular film 4 is conveyed forward. Further, on the downstream side of the bag making device 20, a plurality of objects to be packaged 3 supplied by the packaged object feeder 40 are arranged inside the tubular film 4 at predetermined intervals in the longitudinal direction of the tubular film 4. Has been done. Then, these objects to be packaged 3 are conveyed to the downstream side by following the tubular film 4 on the receiving plate and the belt conveyor 50 while maintaining their arrangement.

A vertical sealing device 10 is provided in front of the bag making device 20 and below the receiving plate. FIG. 1 is a drawing showing the vertical sealing device 10 projected in the direction of the arrow A shown in FIG. The overlapping portion 5 sealed by the vertical sealing device 10 is folded to the left or right so as to be in contact with the lower surface of the tubular film 4 when sent from the vertical sealing device 10 onto the endless belt of the belt conveyor 50. In addition, a transport roller pair that sandwiches the overlapping portion 5 and applies a transport force may be provided in front of or behind the vertical sealing device 10.

The belt conveyor 50 transports the tubular film 4 sealed by the vertical sealing device 10 and the object to be packaged 3 inside the tubular film 4 forward.

Above the belt conveyor 50, an upper holding device 60 for holding the object to be packaged 3 on the belt conveyor 50 from the outside of the tubular film 4 is provided.

The tubular film 4 and the object to be packaged 3 conveyed to the front end of the belt conveyor 50 are transferred from the belt conveyor 50 to the carry-out belt conveyor 80.

A lateral sealing device 70 is provided between the belt conveyor 50 and the carry-out belt conveyor 80. The lateral sealing device 70 has an upper sealer 71, a lower sealer 72, a cutter, and the like. The lateral sealing device 70 periodically sandwiches the tubular film 4 between the upper sealer 71 and the lower sealer 72 to seal and cut the film 4 in the lateral direction. The timing at which the lateral sealing device 70 seals and cuts the film 4 is from the time when the object to be packaged 3 passes through the lateral sealing device 70 to the time when the next object to be packaged 3 passes through the lateral sealing device 70. Is. That is, when the portion of the film 4 between the adjacent objects to be packaged 3 is transferred from the belt conveyor 50 to the carry-out belt conveyor 80, the portion is sealed and cut by the lateral sealing device 70. As a result, the package 2 is completed. The completed package 2 is conveyed forward by the carry-out belt conveyor 80.

The lateral sealing device 70 is a box motion type or rotation drive type sealing device. In the box motion type, the upper sealer 71 and the lower sealer 72 are moved forward together with the film 4 with the film 4 sandwiched between the upper sealer 71 and the lower sealer 72, and then the upper sealer 71 and the lower sealer 72 are moved backward. Refers to a drive system in which the upper sealer 71 and the lower sealer 72 are once separated in the vertical direction and then brought close to each other when the film is returned to. The rotary drive system is a drive in which the upper sealer 71 is circularly moved by the upper shaft and the lower sealer 72 is circularly moved by the lower shaft below the upper sealer 71 to bring the upper sealer 71 and the lower sealer 72 into contact with each other. It is a method.

1 ... Pillow packaging device 4 ... Film 5 ... Overlapping part 10 Vertical sealing device 14 ... Ultrasonic generator 15 ... Horn 16 ... Anvil 16a ... Groove 160a, 160b ... Opening

Claims (7)

A rotating disk-shaped ultrasonic melting anvil and
A horn that is abutted against the outer peripheral surface of the anvil via the film overlapping portion,
It is equipped with an ultrasonic generator that vibrates the horn.
A sealing device in which grooves diagonal to the axial direction and the circumferential direction are formed on the outer peripheral surface of the anvil. The sealing device according to claim 1, wherein the groove is open on one end surface and the other end surface of the anvil. The sealing device according to claim 2, wherein the opening of the groove on one end surface of the anvil is displaced in the circumferential direction from the opening of the groove on the other end surface of the anvil, and these openings do not overlap in the axial direction. A packaging device comprising the sealing device according to any one of claims 1 to 3, and packaging an object to be packaged with the film sealed by the sealing device. It is a rotating disk-shaped ultrasonic welding anvil,
An anvil having grooves oblique to the axial direction and the circumferential direction on the outer peripheral surface of the anvil. The anvil according to claim 5, wherein the groove is open on one end surface and the other end surface of the anvil. The anvil according to claim 6, wherein the opening of the groove on one end surface of the anvil is displaced in the circumferential direction from the opening of the groove on the other end surface of the anvil, and these openings do not overlap in the axial direction.

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