JPH11124111A - Fastener locking apparatus for packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener locking apparatus for a packaging bag wherein a fastener attached to a bag mouth of the packaging bag is automatically and reliably engaged. SOLUTION: The fastener locking apparatus for a packaging bag for pressing to engage a fastener 3 comprising a locking string 10 attached to one of internal faces of a bag mouth and the other locking string 11 attached to the other internal face to be engaged with the locking string 10 has a contact plate 6 brought into contact with one of external faces of the bag mouth over a full length of the locking string 10 and a pressing plate 9 sliding on the external face of the bag mouth along the other locking string 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag fastener locking device for pressing a fastener attached to a bag mouth of a packaging bag.

[0002]

2. Description of the Related Art One of the fasteners of a fastener is mounted on the inner surface of one side of a bag mouth, and the other is provided on the inner surface of the other side. 2. Description of the Related Art A packaging bag is known in which a locking strip is engaged with the other locking strip, and the bag mouth is closed by fusing the bag mouth above the fastener. Such a packaging bag is usually transferred to the bag mouth closing device after filling the contents in the filling device, and the fastener is manually pressed and engaged from one end to the other end thereof, and the zipper is placed above the fastener. Was sealed by pressing with a hot sealing bar. However, in this method, it takes time and effort to manually engage the fastener, and the working efficiency is very poor.

In view of the above, a pair of chucking bars are provided at the tip portions of a pair of interlocking arms swinging in opposite directions, and a pair of sealing bars are mounted above the chucking bar so as to face each other. A zipper-sealing device for a zipper-equipped packaging bag in which the zipper-tightening bar is pressed against the packaging bag prior to the sealing bar is disclosed in Japanese Utility Model Publication No. 63-131.
No. 35 discloses this. However, when the above fastener is pressed and engaged at a stretch over its entire length, the locking strip is bent and a portion that does not engage occurs, and the fastener that has not been engaged during transportation or the like starts from the portion that was not engaged. There is a fear that it will come off.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a packaging bag fastener locking device capable of automatically and securely engaging a fastener attached to a bag mouth of a packaging bag. With the goal.

[0005]

According to the present invention, there is provided a fastener for locking a packaging bag according to the present invention. One of the locking strips is mounted on the inner surface of one side of the bag mouth, and the other is locked on the inner surface of the other side. A zipper for pressing and engaging a fastener comprising the other locking strip meshing with the strip, and a contact plate abutting on one outer surface of the bag opening over the entire length of the one locking strip; And a pressing plate that slides on the outer surface of one side of the bag mouth along the other locking strip.

[0006] While the pressing plate is pressed against the backing plate,
It slides along a fastener, and as a result, the other engaging strip is pressed against one locking strip and both engage. Also,
By sliding the pressing plate from one end of the fastener to the other end, the already engaged portion of one locking strip and the other locking strip can sequentially engage subsequent locking strips Guide to the right place.

[0007] The contact plate and the pressing plate can be freely contacted and separated from each other,
The pressing plates may be mounted on a slide table of a rodless cylinder, and sealing bars may be provided above and below the slide tables so as to be able to freely contact and separate from each other. By doing so, the bag mouth of the packaging bag is welded above the fastener, and the bag mouth is more securely closed. Further, the pressing plate is preferably formed by bending a spring plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a fastener 1 for locking a packaging bag according to the present invention presses and engages a fastener 3 mounted on the inner surface of a bag mouth of a packaging bag 2. A pair of swing arms 4 and 5 swinging in opposite directions to each other, a contact plate 6 attached to the lower end of one swing arm 4, and a contact plate 6 attached to the lower end of the other swing arm 5. And a short pressing plate 9 attached to a slide table 8 of the rodless cylinder 7. The fastener 3 is attached over the entire width thereof in parallel with the upper edge of the packaging bag 2, and one of the locking strips 10 is mounted on one inner surface of the bag mouth, and one of the locking strips is mounted on the other inner surface. It comprises a strip 10 and the other locking strip 11 which is detachably engaged.

The upper ends of the oscillating arms 4 and 5 are pivotally supported by a frame (not shown), and are connected via a conventionally known connecting means such as a link mechanism. When the link mechanism is operated, the oscillating arms 4 and 5 are operated. Swing in conjunction with each other in opposite directions, so that the lower ends thereof come into contact with and separate from each other. The swing arms 4 and 5 are provided downstream of the contents filling device of the packaging machine in the transport direction, and the opening of the packaging bag 2 transferred through the contents filling device is moved by the swing arms 4 and 5. Is located between the lower ends.

As shown in FIG. 2, the backing plate 6 is formed slightly longer than the fastener 3 and is firmly attached to the inner surface of the lower end of one swing arm 4 via a bolt 12 and a nut 13. As shown in FIGS. 1 and 2, when the lower ends of the swing arms 4 and 5 approach each other, the backing plate 6 is provided on the outer surface of one side of the bag opening of the packaging bag 2 and over the entire length of one locking strip 10. It is abutted over.

The rodless cylinder 7 is disposed along the fastener 3 and, as shown in FIGS. 3 and 4, a cylinder tube 14, a piston 15 sliding inside the cylinder tube 14 along the longitudinal direction, and a cylinder 15. Tube 1
The slide table 8 is provided outside the cover 4 so as to face the backing plate 6 and is joined to the piston 15 and slides with the piston 15. A bore 17 having a circular cross section is formed in the cylinder tube 14 along the longitudinal direction. The bore 17 is formed in the cylinder body 14 through a slit 18 formed in the inner surface of the cylinder tube 14 along the longitudinal direction. Communicates with the outside world.

Further, both ends of the cylinder tube 14 are
Each is sealed by an end cover 16 in which a port 19 is formed. Further, the opening of the bore 17 is closed by an inner seal band 20 made of a flexible material,
The opening of the slit 18 is closed by an outer seal band 21 made of a flexible material.

As shown in FIG. 4, the piston 15 is formed in a cylindrical shape, and a narrow neck portion 22 passing through the slit 18 protrudes from a surface on the slit 18 side. A wide locking projection 23 is formed at the tip of the neck 22, and the locking projection 23 projects outside the cylinder tube 14. Then, the locking projection 23 is engaged with the outer surface of the slide table 8, so that the piston 7 and the slide table 8 slide integrally.

An inner seal band 20 for closing the bore 17 of the cylinder tube 14 is slidably inserted into the piston 15 through through holes formed on both sides of the neck 22 in the longitudinal direction. Further, an outer seal band 21 for closing the slit 18 of the cylinder tube 14 is provided.
Is slidably inserted between the locking projection 23 and the slide table 8.

As shown in FIG. 2, the pressing plate 9 is formed by bending a band-like spring plate, and one end of a flat fixing portion 24 is folded into a mountain shape, and the top portion thereof is a pressure contact portion 25. And
The fixing part 24 is fixed to the surface of the slide table 8 of the rodless cylinder 7 using a fixing tool 26 such as a screw, and the press contact part 25 is opposed to the backing plate 6. Above the backing plate 6 and the pressing plate 9, a sealing bar 27 similar to the conventional one is arranged so as to be able to freely contact and separate.

The fastener 1 of the present invention is used as follows. As shown by a broken line in FIG. 1, the swing arms 4 and 5 are in an opened state in advance, and as shown in FIG.
Is disposed near one end of the cylinder tube 14.
When the packaging bag 2 filled with the contents in the filling device is conveyed to a position between the swing arms 4 and 5 and stopped, a link mechanism (not shown) operates to swing the swing arms 4 and 5 downward. The lower end approaches.

Then, the backing plate 6 and the pressing plate 9 attached to the lower ends of the swinging arms 4 and 5 also approach each other, and the backing plate 6 is attached to one outer surface of one side of the bag mouth of the packaging bag 2 by one of the fasteners 3. At the same time, the pressing plate 9 is brought into contact with the position corresponding to the other engaging ridge 11 on the other outer surface, and the bag mouth is gradually compressed. When the swing arms 4 and 5 swing to the lower limit position shown by the solid line in FIG. 1, the bag mouth of the packaging bag 2 is completely closed, and as shown in FIG. It is pressed closer to one end, and as a result, the fastener 3
One of the locking ridges 10 and the other locking ridge 11 are pressed and engaged at one end thereof.

Next, when compressed air is injected into the cylinder tube 14 through the port 19 at one end of the rodless cylinder 7, the piston 15 moves toward the other end under the pressure, and the piston 15 moves accordingly. The slide table 8 engaged with the piston 15 slides along the cylinder tube 14. Then, the pressing plate 9 attached to the slide table 8 slides on the other outer surface on the other side of the bag mouth toward the other end while pressing the backing plate 6, and the one locking strip 10 of the fastener 3 and the other locking strip 10 Are sequentially engaged from one end to the other end.

When the fastener 3 has been engaged over the entire length, a pair of sealing bars 27 heated to a high temperature are brought close to each other and pressed against the outer surfaces on both sides of the bag mouth of the packaging bag 2. Is welded. Next, while the sealing bar 27 is separated, the swing arms 4 and 5 are swung upward to separate the abutment plate 6 and the pressing plate 9, and the packaging bag 2 having the closed bag opening is subjected to the next step. Transfer to

In order to lock the fastener 3 of the packaging bag 2 conveyed next, compressed air is injected into the cylinder tube 14 through the port 19 at the other end of the rodless cylinder 7, and the pressing plate is pressed. 9 is slid from the other end to one end, whereby the one locking line 10 and the other locking line 11 are engaged with the fastener 3 of the packaging bag 2 from the opposite direction. Further, the sealing bar 27 may be brought into contact with or separated from the packaging bag by a mechanism independent of the fastener locking device 1, but it is attached to the swing arms 4, 5 above the backing plate 6 and the pressing plate 9, respectively. Can also. Sealing bar 27
Are attached to the swing arms 4 and 5, the contact plate 6 and the pressing plate 9
At the same time, the sealing bar 27 also approaches, and the step of welding the bag mouth and the step of locking the fastener 3 are performed simultaneously.

[0021]

According to the structure of the first aspect, the fastener provided at the bag mouth of the packaging bag is sequentially pressed and engaged from one end to the other end. The already engaged portion of the stop will guide the subsequent locks to the correct engagement position, so that the fastener can be locked reliably and easily without manual work.

[Brief description of the drawings]

FIG. 1 is a side view of a fastener device for fastening a packaging bag according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the above.

FIG. 3 is a sectional side view of a main part of a rodless cylinder.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastener locking device of packaging bag 2 Packaging bag 3 Fastener 4,5 Swing arm 6 Backing plate 7 Rodless cylinder 8 Slide table 9 Press plate 10 One locking strip 11 The other locking strip 12 Bolt 13 Nut 14 Cylinder tube 15 Piston 16 End cover 17 Bore 18 Slit 19 Port 20 Inner seal band 21 Outer seal band 22 Neck 23 Engagement projection 24 Fixed part 25 Press-contact part 26 Fixture 27 Sealing bar

Claims (4)

[Claims] 1. A fastener comprising a locking member mounted on one inner surface on one side of a bag mouth and another locking member mounted on an inner surface on the other side and meshing with the one locking member. In the fastener device for a packaging bag to be fastened, a contact plate abutting on one outer surface of the bag opening over the entire length of the one locking streak, and the bag mouth along the other locking streak. And a pressing plate that slides on an outer surface on one side. 2. The fastener device according to claim 1, wherein the backing plate and the pressing plate are freely movable toward and away from each other. 3. The fastener device according to claim 1, wherein the pressing plate is attached to a slide table of a rodless cylinder. 4. The fastening device according to claim 1, wherein the pressing plate is formed by bending a spring plate.