JP3463909B2 - Tube making equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film tube forming apparatus used to form a pleated square bag having four corners.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 55-48012 discloses a device for manufacturing a rectangular bag 1 having pleats 2 formed at four corners as shown in FIG. In the apparatus, in the process of moving the strip-shaped film in the direction of arrow 3, the film is first formed into a tube along the inner surface of the rectangular first forming cylinder, and then this tube film is formed into a second forming cylinder having a rectangular cross section. The pleats 2 are formed along the ribs protruding from the corners of the second forming cylinder by moving the pleats 2 along the outside.

[0003]

According to the above-mentioned apparatus, while the strip-shaped film is formed into a tube shape along the inner surface of the first forming cylinder, the object to be packaged is utilized from its upper end opening portion of the first forming cylinder by utilizing its gravity. Supply (drop) into the same tube film
Type, that is, a vertical packaging device. Even if the device is used as a horizontal device, the tube film moves outside the second molding cylinder at the portion of the second molding cylinder, so that the portion of the cylinder is covered. There is the drawback that the transport force of the packages is interrupted and thus does not function as a horizontal packaging device.

[0004]

In order to apply the present invention to a horizontal packaging apparatus, a flat slide plate 11 having an upper surface horizontally supported on a machine base and a slide plate 11 extending along the longitudinal direction of the slide plate are provided. A cylindrical mold 14 having a reverse groove cross-section which is placed on the sliding plate, and a member 16 for connecting the cylindrical mold to the machine base so that the lower open surface of the cylindrical mold substantially matches the upper surface of the sliding plate. And a fixed film passage gap is formed between the gate-shaped frame 22 fixed to the machine base so as to cover the cylinder-making mold and both sides of the cylinder-molding mold fixed to the frame. Two upper surface pressing plates 2 arranged in parallel so as to form a constant film passing gap between the pair of side surface pressing plates 26 arranged on both sides and the upper surface of the cylindrical mold which is also fixed to the frame.
9 and a slit 4 for passing a film having a constant width formed in the central portion of the upper pressing plate along the longitudinal direction of the tubular mold.
2, ribs 15 projecting outwardly from the four corners of the tubular mold along the longitudinal direction of the tubular mold, and sandwiching both side edges of the strip-shaped film covering the tubular mold. A rotating body 43 for pulling the film from the rear side of the tubular mold, and a top and bottom 2 provided from the rear side of the pair of side surface pressing plates 26 through flexible connecting members 37 in the film transfer direction respectively.
Each of the heat bars 36 is composed of a heat bar 36 and elements for pressing the heat bar against the sliding plate and the upper pressing plate with a fold formed at the corner of the film made into a cylinder.

[0005]

Function: A strip-shaped film placed along the sliding plate is rolled into a tubular shape around the tubular die. Since the tubular type is a reverse groove type and the lower surface is open, when the tubularly rolled film is pulled in the longitudinal direction, the tube film slides on the upper surface of the sliding plate. Therefore, when an object to be packaged is supplied into the tube film from one end of the tubular mold, the object to be packaged is carried on the tube film without any interference.

The slide plate is originally installed along the lower open surface of the tubular mold, and a film passing gap is provided between the pair of side surface holding plates and upper surface holding plates on both sides and the tubular mold. As a result, the tube flume is pressed against the tubular mold by these plates, and the ribs protruding from the tubular mold form the original pleats on the tube film.

When the original shape of the folds passes between the upper pressing plate and the heat bar and between the lower sliding plate and the heat bar, the welding is performed by the pressure contact force of the heat bar with the upper pressing plate and the pressure contact of the heat bar with the sliding plate. And pleats each of the four corners of the square tube film.

[0008]

EXAMPLE As shown in FIG. 1A, a sliding plate 11 fixed on a machine base 10 is stuck on a base 13 fixed to the machine base 10 with screws 12 as shown in FIG.
Has a reverse groove type cross section, and ribs 1 from each of the four corners
5 is protruding outward.

As shown in FIG. 2, the tubular mold 14 is supported on the machine base via a member 16 fixed to the upper surface of the tip thereof, and as shown in FIG. 1A, the lower open surface 17 and the sliding plate 11 of the tubular mold are separated. The upper surface is aligned at the same height, and the strip-shaped film 20 sent through the roller 18 is put on the upper surface of the slide plate 11, and the same film is wound around the cylindrical die 14 in a tubular shape. After that, the tube film 20 is pulled by pulling the tube film in the direction of arrow A by the power of the rotating body.
a slides on the upper surface of the sliding plate 11. Therefore, the object to be packaged 21 sent from the tip of the tube-making type is the tube film 20.
It is transported on board a.

Two front and rear frames 22 and 2 in FIG.
3 is a gate type as shown in FIG. 4, both ends of which are fixed to the machine base 10 with bolts 24 so as to cover the cylinder making type 14,
A pair of double-sided pressing plates 26 fixed to the frame via brackets 25 are arranged with a film passing gap 27 between both side surfaces of the tubular mold 14 and fixed to the same frame via blocks 28. Side-by-side pair of upper holding plates 2
9 and a film passing gap 30 between the upper surface of the cylindrical mold 14 and
Since the tube film 20a moving around the cylindrical mold can be formed by four ribs 15, four folds 31 of the original shape can be formed.

As shown in FIG. 2, the two side pressing plates 26 on both sides of the cylindrical mold are provided with parallel links 34, 3 so that a movable block 33 arranged on the outer side thereof can be displaced in the front-rear direction.
5, and the heat bar 36 is supported on both of the movable blocks 33 via a connecting member 37. In addition, the coil spring 3 that connects the fixed block 28 and the movable block 33
The pulling force of 9 is effective on both sides of the Z point formed between the parallel link 34 and the support pin, and the upper pressing plate 29 in the normal pressure contact state and the heat bar 36 can be separated from each other.

As shown in FIG. 1B, the metal heat bars 36 on both sides are composed of two upper and lower parts, and a pipe heater 38 is installed inside the heat bar 36. The heat bar 36 has four springs 39 shown in FIG. The folds 31 are sandwiched and the upper pressing plate 29 is provided at the upper portion, and the sliding plate 1 is provided at the lower portion.
An urging force B is applied so as to press contact with 1.

An example of the urging force can be implemented by forming the connecting member 37 by a leaf spring and causing the elastic force of the leaf spring to act in the direction of arrow B.

It is also possible to urge the heat bar 36 in the direction of arrow B by the pressure of compressed air acting on the actuator, and in this case, the magnitude of the urging force can be adjusted variously.

Further, the heat bar 36 can be attracted in the direction of arrow B by the permanent magnet 40 fixed to the upper pressing plate 29, or the heat bar 36 can be attracted by the electromagnet 41 fixed to the sliding plate 11.

The film palm edge protruding from the slit 42 between the pair of upper pressing plates 29 is welded by the pair of rotating bodies 43, and both rotating bodies 43 also function as power bodies for carrying the tube film. .

[Brief description of drawings]

[Fig. 1A] Side view of the center with a split bamboo section

FIG. 1B is a cross-sectional view obtained by cutting the previous figure with a bamboo ring, and is a cross-sectional view taken along line I-I in FIG. 2.

FIG. 2 is a plan view of FIG. 1A.

FIG. 3 is a sectional view taken along the line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

10 ... Machine stand 11 ... Sliding plate 14 ... Cylinder type 15 ... Ribs 17 ... Lower opening surface 20 ... Tube film 22, 23 ... Frame 26 ... Side holding plate 27, 30 ... Film passing gap 29 ... Top pressing plate 31 ... Hida 36 ... Heat bar 37 ... Connecting material (leaf spring) 40 ... Permanent magnet 41 ... Electromagnet

Claims (4)

(57) [Claims] 1. A flat slide plate 11 having an upper surface horizontally supported on a machine base, and a tubular mold 14 having a reverse groove cross-section which is covered on the slide plate so as to extend along the longitudinal direction of the slide plate. And a member 16 for connecting the tubular mold to the machine base so that the lower open surface of the tubular mold substantially matches the upper surface of the slide plate, and fixed to the machine base so as to cover the tubular mold. Gate-shaped frame 22
And a pair of side-face pressing plates 26 fixed to the frame and arranged so as to form a constant film passage gap between both side surfaces of the cylindrical mold, and also of the cylindrical mold fixed to the frame. Two upper surface pressing plates 29 arranged in parallel so as to form a constant film passing gap with the upper surface.
And a slit 42 for passing a film having a constant width formed in the central portion of the upper pressing plate along the longitudinal direction of the tubular mold.
A rib 15 projecting outwardly from each of the four corners of the tubular mold along the longitudinal direction of the tubular mold, and both side edges of a strip-shaped film covering the tubular mold are sandwiched between the ribs.
A rotating body 43 for pulling the rum from the rear of the tubular mold, and two upper and lower heat bars 36 provided from the rear of the pair of side surface pressing plates 26 in the film transfer direction via flexible tie members 37, respectively. A tube-making device constituted by an element that presses and urges the heat bar against the slide plate and the upper pressing plate with a fold formed at the corner of the film made into a tube. 2. The cylinder manufacturing apparatus according to claim 1, wherein the element for pressing and urging the heat bar against the sliding plate and the upper pressing plate is configured to utilize the elastic force of a spring. 3. The cylinder manufacturing apparatus according to claim 1, wherein the element for pressing and urging the heat bar against the sliding plate and the upper pressing plate is configured to utilize the attractive force of the magnet. 4. The cylinder manufacturing apparatus according to claim 1, wherein the element for pressing and urging the heat bar against the sliding plate and the upper pressing plate is configured to utilize the pressure of compressed air.