JPH05254043A - Bag manufacturing apparatus - Google Patents

Abstract

PURPOSE:To provide a bag manufacturing apparatus with a function of automatically forming folded up creases at both sides in the longitudinal direction. CONSTITUTION:Four guide bars 5 are secured to a former 1 adapted to roll a film sheet and thus form it into a cylindrical film T, and attached at the lower end of a tube P which acts to conduct the cylindrical film T. Discs 9 are disposed which are employed as being a crease forming members capable of approaching and separating from both sides of the part where these guide bars 5 are provided, and by approaching these discs thereto, the cylindrical film T is folded up from both sides, to thereby form folded up creases automatically during the period of a bag manufacturing process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-making apparatus for rolling a plastic sheet into a tubular shape and folding it vertically to form a bag having pleats.

[0002]

2. Description of the Related Art An apparatus for forming a bag by rolling a plastic sheet into a tubular shape and sealing it laterally is already known. However, as shown in FIG. 5 attached to the present specification, there is not yet provided a device for continuously and automatically forming bags having deep folds on both sides in the longitudinal direction as shown in a state after the items are packed.

[0003]

SUMMARY OF THE INVENTION The present invention provides a bag-making apparatus having the function of continuously and automatically forming folds on both sides in the longitudinal direction as described above.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided with a fold forming member below a former that rolls a sheet film into a cylindrical shape so as to be opposed to each other in the left and right directions so that they can approach and separate from each other. It was done.

[0005]

In the device according to the present invention, when the above-mentioned pleating members are brought close to each other, the tubular film formed by the former is pushed from both sides, and the longitudinal folding pleats are automatically formed during bag making. it can. Hereinafter, the present invention will be specifically described based on illustrated embodiments.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a known former for guiding a sheet film F so as to be rolled into a tubular shape. The former 1 is provided with a tube P which guides and guides the sheet film F rolled into a tubular shape downward.

On the side of the tube P, two disk-shaped pull-out rollers 2 sandwiching the edge of the film rolled into a cylinder are arranged. Below the pull-out roller 2, a disk-shaped sealer is provided. 3 is provided, and the edge of the sheet film rolled into a tubular shape is sealed to form a tubular body.

Four projecting pieces 4 are formed on the lower end of the tube P, and four guide bars 5 are provided downward from the lower end of the projecting piece 4, respectively.

Below the tube P is a pair of rubber rollers 6
The rubber roller 6 is driven and rotated by the chain 7 and is brought closer to each other by the piston 8.
It is configured to be separated.

When the rubber rollers 6 come close to each other, the tubular film T is sandwiched, and the rotation thereof pulls it out continuously. On the other hand, discs 9 are arranged at a position slightly above the rubber roller 6 so as to face each other along the axial direction of the rubber roller 6.

The disc 9 has a sharp tip and is rotatably supported by a support plate 10 which can be taken out and put in. With this configuration, the discs 9 are brought closer to each other and applied to the tubular film T, and when the rubber rollers 6 are brought closer to each other, the tubular film T that is continuously drawn out downwardly has a disc shape as shown in FIG. The folding folds are formed by 9 and folded flat to form a bag having a deep folding fold.

If the rubber roller 6 is made of sponge and the plastic bag which is filled with the articles and descending as shown in FIG. 3 is sandwiched, the bag is squeezed by the possible sponge and the bag inside Can be degassed. As described above, the rubber roller 6 also has a function of pulling the tubular film T downward, so that the rubber roller 6 has a central portion 6'made of sponge for degassing and a crimp as shown in FIG. It is preferable that the formed tubular film T has a rubber portion 6 ″ for sandwiching both end portions thereof to provide feeding.

As described above, when the cylindrical film T is deaerated by the rubber roller 6, the inside of the cylindrical film T is depressurized, so that the cylindrical film T is pressed from the outside by the atmospheric pressure, and the disc 9 is pressed. The folding folds formed at both ends of the folds are moved to the sealer 11 below the folds while being properly held.

In FIG. 3, (a) shows a state where the tubular film T closed by the sealer 11 is filled with the product and the lower filling bag is about to be separated.
(B) is a state in which the sponge rubber roller 6 is sandwiching the descending tubular film T for deaeration,
(C) shows a state in which the degassed filling portion is descending between the open sealers 11. After the tubular film T exits the rubber roller 6, the inside is degassed, so that it is in close contact with the folded portions at both ends as described above.

The sealer 11 disposed below the rubber roller 6 is a sealer for sandwiching the continuously moving tubular film T in the same direction as the rubber roller 6 and fusing and sealing. As the sealer 11, for example, JP-A-52-5
Various publicly known ones such as those shown in Japanese Patent No. 6686 may be adopted, and detailed description thereof will be omitted.

The operation of the apparatus described above will be described below.
In the state of FIG. 1, the item to be bagged through the tube P,
After filling the formed tubular film T, the sealer 1
1 is opened, the rubber roller 6 and the disc 9 serving as a pleating member are brought close to each other, and the tubular film T is pulled down while the tubular film T is folded in the state of FIG.

At this time, a rubber roller made of sponge can be used to evacuate the inside of the tubular film T. The tubular film T, which is pulled out to a predetermined length, is sandwiched by the sealer 11 to seal and separate the film, as shown in FIG.
As shown in the figure, a bag with folded pleats is formed.

In the embodiment described above, four projecting pieces 4 are formed at the lower end of the tube P, and one piece is provided below each of the projecting pieces 4.
Although the book guide bar 5 is provided, it is not limited to such a configuration. In short, as long as the tubular film T is held in an expanded state and the disc 9 as the fold forming member is inserted as shown in FIG. 2, the film T can be received from the inside to be pleated. It may have an appropriate configuration.

Further, in the illustrated apparatus, the rotatably supported disk 9 is used as the fold forming member, but this is not limited to such a structure. The point is that the tubular film T may be pushed in from both sides and folded in the state shown in FIG. 2, and may be, for example, a simple rod-like one with the tip rounded.

[0020]

As described above in detail, in the bag making apparatus according to the present invention, the left and right sides are opposed to each other so that they can approach and separate from each other, and the formed tubular film is pushed from both sides to be folded and folded. Since the fold forming member for forming the folds is provided, it is possible to automatically make a fold with a desired depth during bag making.

Further, in the apparatus according to the present invention, since the fold forming member is configured to cooperate with the four guide bars, the folding folds can be smoothly and cleanly performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a bag making apparatus according to the present invention.

FIG. 2 is a transverse cross-sectional view showing a state in which a tubular film is folded by a fold forming member.

FIG. 3 is a side view for explaining a deaeration operation inside a tubular film by a deaeration rubber roller.

FIG. 4 is a perspective view showing a configuration of a degassing rubber roller.

FIG. 5 is a perspective view showing an example of bag filling formed by the device of the present invention.

[Explanation of symbols]

 1 Former 5 Guide bar 9 Disc 11 Sealer F Sheet film P Tube T Cylindrical film

Claims (3)

[Claims] 1. A bag-making apparatus for forming a bag, comprising a former for rolling a sheet film into a tubular shape, pulling out a tubular film formed by the former downward, and heat-sealing in a direction perpendicular to the transfer direction to produce a bag. A bag making apparatus characterized in that it has a fold forming member which is disposed below the former so as to be opposed to each other on the left and right sides so as to be able to approach and separate from each other, and which presses the tubular film from both sides to form a fold. 2. A tube for guiding the tubular film formed by the former extends vertically and is attached to the former, and four guide bars are provided at the lower end of the tube so as to face downward. The bag making apparatus according to the above item 1, wherein the bag making apparatus is provided. 3. A pair of rollers is provided below the fold forming member on both sides in a direction perpendicular to the fold forming member so as to degas the inside of the same by sandwiching the cylindrical film and to pull out the cylindrical film downward. The bag making apparatus according to 1 above.