JPH09295624A - End seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end seal device which ensures satisfactory sealing performance even when increasing line carrying speed and, therefore, improves manufacturing availability. SOLUTION: This device comprises a slide table 18 which reciprocally moves in the direction of the carrying of a cylindrical film wrapping an item, and a rotary type of sealer mechanism 26 which is supported by a fine 24 on the slide table 18 and bites the cylindrical film by means of a pair of sealers 36a and 36b. The device repeats the operation in which the slide table 18 advances in the direction of carrying when the rotary type of sealer mechanism 26 bites and seals the cylindrical film and it retracts when it is separated from the cylindrical film. The sum of the peripheral speed of the front-end faces of the rotating sealers 36a and 36b and the advancing speed of the slide table 18 is made substantially equal to the speed at which the cylindrical film is carried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end seal device for laterally sealing and cutting a predetermined portion of a tubular film containing an object to be packaged.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional horizontal pillow packaging device. As shown in the figure, the object to be packaged 3 pushed by the pusher 2 at an appropriate interval on the conveyer 1 is a film reel 4 arranged on the end of the conveyer.
It is surrounded in a tubular shape by the film 5 fed out from. Then, the tubular film 5 containing the article to be packaged 3 is laterally welded and cut at a predetermined portion by the end seal device 6 arranged at the final stage of the packaging device, so that the film 5
The articles 3 to be wrapped in are separated and delivered to the discharge conveyor 8.

The end seal device 6 has an upper sealer 6a and a lower sealer 6b which are vertically opposed to each other, and these sealers 6a and 6b are respectively rotating shafts 7a and 7b.
It is attached integrally to b and the film 5
The end faces are in pressure contact with each other. Although not shown, a heater is arranged inside the sealers 6a and 6b, and a cutting blade is provided in the center of the end face along the direction of the rotation axis, and the tubular film 5 is sandwiched between the end faces. The upper and lower film surfaces are heat-sealed and the center of the heat-welded portion is cut with a cutting blade to separate them. Therefore, the rotation speeds of the sealers 6a and 6b are matched with the feed speed of the tubular film 5.

[0004]

In the end seal device 6, the factors that affect the heat sealability are the contact time of the end faces of the sealers 6a and 6b with the film 5, and the sealer 6 with respect to the melting temperature of the film 5.
a and 6b. That is, if the contact time is shortened, sufficient heat will not be transferred to the film 5, causing insufficient heat sealing. Further, if heated too much, not only will the welded area of the film 5 be reduced, but the appearance of the seal welded portion will be impaired, so with an appropriate contact time, an appropriate heating temperature according to the melting temperature of the film 5 Must be kept at.

Therefore, the conveying speed of the packaged object 3 is set by being restricted by the above factors, and therefore it is difficult to increase the line conveying speed of the packaged object 3 for the purpose of improving productivity and operating efficiency. Met. That is, when the transport speed is increased, the rotation speeds of the sealers 6a and 6b must be necessarily increased in synchronization with each other, so that the contact time becomes short and sufficient heating cannot be performed, resulting in insufficient heat sealing. was there.

The present invention solves the above problems, and an object thereof is to provide an end seal device capable of ensuring good heat sealability even if the line transport speed is increased, thereby improving the production operation rate. To do.

[0007]

In order to achieve the above object, the present invention provides a predetermined portion of a tubular film containing a material to be packaged and conveyed in the longitudinal direction between a pair of rotary sealer tip surfaces. In an end-seal device for laterally sandwiching and sealing and cutting, a frame supporting the pair of rotary sealers is attached to a moving body that reciprocates along the transport direction of the film, and the moving body is sealed. At times, the rotational speed of the rotary sealer is suppressed by advancing in the conveying direction and making the sum of the peripheral speed of the tip of the sealer and the advancing speed of the moving body substantially coincide with the conveying speed of the film. While ensuring sufficient time to sandwich and seal the film between the pair of sealer tip faces, moving the entire rotary sealer together with the moving body forward in the transport direction increases the line transport speed. Corresponding to the reduction.

[0008]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a schematic configuration when the end seal device according to the present invention is applied to a horizontal pillow packaging device.
FIG. 2 is a sectional view taken along line AA in FIG.

As shown in the figure, the end seal device 10 is provided at the final stage of the pillow packaging device, and the conveyor 1 for conveyance is used.
It is arranged in a gap formed between the discharge conveyor 8 and the discharge conveyor 8. The end seal device 10 includes a slide table 18 as a moving body that reciprocates between the conveyors 1 and 8, a lever crank mechanism 20 that drives the slide table 18 reciprocally, and a rotary sealer provided on the slide table 18. A mechanism 26 and a crossover conveyor 30 for securing a transportation path of the article to be packaged between the conveyors 1 and 8 are provided.

The slide table 18 is attached to a slide block 16 which fits and slides on a pair of guide rails 14 arranged on the fixed frame 12. The guide rail 14 is provided between the end of the conveyor 1 for conveyance and the start end of the conveyor 8 for discharge along those conveyance directions.

A lever crank mechanism 20 is connected to the slide table 18. This lever crank mechanism 20
Is a connecting rod 20a which is vertically swingably pin-joined to the front end of the slide table 18, a swinging rod 20b having a swinging fulcrum at the lower end, the upper end being pin-connected to the tip of the connecting rod 20a, and the swinging rod 20b. It is a general one composed of a connecting rod 20c which connects an intermediate portion of the moving rod 20b and a crank pin 22a which is erected on the disk 22 which is rotationally driven, and is configured as a quick return crank mechanism, and the disk 22 is not shown. The slide table 18 is rotated by a motor and is reciprocally moved in synchronization with the rotation of the rotary sealer mechanism 26.

A frame 24 is erected on the slide table 18, and a rotary sealer mechanism 26 is rotatably supported by the frame 24. The rotary sealer mechanism 26 includes a pair of upper and lower shaft portions 32 (32a, 32b) whose both ends are supported by the frame 24.
Upper and lower sealers 36 (36a, 3a) projecting from the outer periphery of each shaft portion 32 and having a plurality of heaters 34 embedded therein
6b), a cutting blade 38 which is embedded in the upper sealer 36a and projects from the tip thereof, and a receiving blade 40 which is embedded in the lower sealer 36b and faces the cutting blade 38.

Gears 42 meshing with each other are arranged on one end side of the shaft portions 32, respectively.
Are rotated in opposite directions toward the feeding direction of the film 5. The other end of the upper shaft 32 is connected to a drive motor 44, which serves as a drive shaft.

The above rotary sealer mechanism 26 has the sealers 36a, 3a when the slide table 18 moves forward.
6b sandwiches the tubular film 5 between their front end faces, presses the cutting blade 38 against the receiving blade 40 while welding and sealing the upper and lower films 5 by applying heat and pressure to cut the film 5, and the discharge side It is discharged to the conveyor 8.

FIG. 3 shows the operation state. First, in (a), the surfaces of the respective sealers 36a and 36b on the advance side in the feed direction are brought into pressure contact with the end surface of the discharge side film 5a, and the heater 34 is heated. The ends are heat-welded by heat. Next, as shown in (b), when the upper and lower sealers 36a, 36b are in the vertical state, the cutting blade 38 is pressed against the receiving blade 40, and the end of the discharge side film 5a and the start end of the supply side film 5b are separated from each other. Detach.

Further, as the rotation progresses, as shown in (c), the surfaces of the sealers 36a and 36b on the delayed side in the feed direction press-contact the starting end of the supply-side film 5b, and the heater 34 heats the starting end. After that, the film is rotated once away from the film surface and the same operation is repeated. During this time, the slide table 18 moves back to the standby position and moves forward again, but during this forward movement, the heat fusion-cutting-heat fusion movement is performed.

That is, during the above heat-sealing operation, the rotary sealer mechanism 26 is entirely moved forward along the conveying direction of the film 5 and the articles 3 to be packaged stored therein by the slide table 18, and The upper and lower sealers 36a and 36b are rotationally moved around the shaft portions 32a and 32b. Here, the forward moving speed in the transport direction at the time of sealing the tip surfaces of the sealers 36a and 36b is the sum of the peripheral speed due to the rotation of the tip surfaces of the sealers 36a and 36b and the forward speed of the slide table 18, and these The sum of the speeds is almost equal to the transport speed of the film 5. At this time, it is preferable that the forward speed of the slide table 18 and the peripheral speed of the tip surfaces of the sealers 36a and 36b be substantially equal, but basically, the sum of these speeds is substantially equal to the transport speed of the film 5. Therefore, either one of the peripheral speeds of the tip surfaces of the sealers 36a and 36b and the forward speed of the slide table 18 may be increased, and the other speed may be decreased accordingly. By doing so, the sealer 36a,
The peripheral speed of the tip surface of 36b, that is, the rotation speed, can be slowed down, so that the welding and cutting operations can be performed at a rotation speed suitable for heat fusion while ensuring a sufficient contact time.

In addition, with the reciprocating movement of the slide table 18, the gaps to be expanded and contracted at two places between the rotary sealer 26 and the conveyor 1 and between the rotary sealer 26 and the discharge conveyor 8 are filled. A crossover conveyor belt 30 is provided in order to secure a conveyance path at the relevant portion and prevent the article 3 to be packaged from falling off. The crossover conveyor belt 30 has an entrance side fixed pulley 28a arranged at the end position of the conveyor conveyor 1 with a uniform height, and an exit side fixed pulley 28b arranged at the start end position of the discharge conveyor 8 with a uniform height. ,
The frame side moving pulley 2 mounted on the frame 24 at the same height as these fixed pulleys 28a and 28b.
8c, the slide table 1 for guiding the crossing conveyor belt 30 downward so as not to hinder the rotation of the lower sealer 36b.
8 is wound around a large number of pulleys 28 such as a table side moving pulley 28d attached to the tension pulley 2
8e prevents loosening as a whole.

In the above embodiments, the case where the end seal device of the present invention is applied to the horizontal pillow packaging device is illustrated, but the end seal device of the present invention is not limited to this horizontal pillow device, but is a vertical type. Of course, it can also be applied to a pillow packaging device.

[0020]

As described above in detail in the embodiments,
In the end seal device according to the present invention, a frame that supports a pair of rotary sealers is attached to a moving body that reciprocates in the film transport direction, and the moving sealer seals the film. By advancing in the direction of transport of the film while the film is being conveyed, the rotational speed of the rotary sealer can be suppressed by the amount of this advancing speed, and thus the time to seal the film by sandwiching the film between the pair of sealer tip faces is reduced. It is possible to cope with an increase in the line transfer speed while sufficiently ensuring the productivity, and to improve the productivity and the operation efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an end seal device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram of an operating state of a rotary sealer in the same device.

FIG. 4 is an explanatory diagram showing an outline of a film packing device including a conventional end seal device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Conveyor 3 Conveying object 5 Film 8 Conveyor for discharge 10 End seal device 18 Slide table 20 Lever crank mechanism 24 Frame 26 Rotary sealer mechanism 32 Shaft part 36 Sealer

Claims (1)

[Claims] 1. An end seal device for laterally sealing and cutting a predetermined portion of a tubular film, which encloses an object to be packaged and which is conveyed in the longitudinal direction, between a pair of rotary sealer front end surfaces, the end seal device comprising: The frame supporting the rotary sealer is attached to a moving body that reciprocates along the transport direction of the film, and the moving body is advanced toward the transport direction when the film is sealed, and the peripheral speed of the tip of the sealer is increased. And an advancing speed of the moving body, which is substantially equal to a conveying speed of the film.