JPS6143686Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a film sealing and cutting device for a packaging machine that seals a film covering an object to be packaged in the packaging machine and cuts the film from the sealed portion. It is.

BACKGROUND ART Conventionally, there is a device of this type as shown in Japanese Utility Model Publication No. 57-6328. In this method, upper and lower films 57 and 58 covering the article to be packaged 59 are sandwiched between upper and lower sealers 60 and 54 and thermally welded, that is, sealed.
The cut is made with a knife 25 provided at 0.

By the way, for example, when a newspaper company ships newspapers to newsagents, the desired number of newspapers are wrapped in film, but this film is transparent so that the address paper can be seen through, and it is also thin and sticky. things are used.

Due to its nature, this packaging operation requires speeding up. And the knife 2
When cutting the films 57 and 58 at the transition of step 5,
The center portions of the films 57, 58 are still good, but at the beginning of the cut at the side edges of the films 57, 58, the knife 25 moves in the direction of the back width downwards on the outside of the films 57, 58 and cuts this. Otherwise, the knife 25 begins to cut while moving downward, and at this time, a tensile force is applied to the ends of the films 57 and 58 in the direction of movement of the knife 25.
Failures such as tearing at the weaker parts of parts 7 and 58, that is, the welded seal parts, often occur. This not only speeds up the packaging process, but also leaves the sealing and cutting operations incomplete.

Structure of the invention The present invention aims to solve the above-mentioned drawbacks of the conventional technology. Two knife holders with knives attached thereto are provided on the left and right sides of the center in the width direction of the film. The purpose is to eliminate the above-mentioned defect by simultaneously cutting from the center to the left and right sides.

This will be explained with reference to the diagram.

Reference numeral 3 denotes an upper sealer, which is provided on the frame 1 so as to be slidable up and down by the operation of an air cylinder 2.

A lower sealer 23 is provided opposite to the upper sealer 3, and is provided on the stand 21 so as to be movable up and down by the operation of an air cylinder 22.

In the upper sealer 3, reference numeral 4 denotes an upper main body, and as shown in FIG. 2, guide bodies 5, 5 are integrally attached to the lower part of the upper main body.

13, 13 are guide grooves provided on the opposing inner surfaces of the guide bodies 5, 5, and the knife holder 1 with a plurality of knives 14 hanging therein is inserted into the guide grooves 13, 13.
Ball bearings 17 provided on both sides of 5 and 15,
17. That is, the knife holder 15 is divided into two parts at the center, and each part is provided slidably outward in the width direction from the center. The knife 14 is also formed with an oblique cutting edge 14'' on the outside.

Seal bodies 9, 9 are placed on the outside of the guide bodies 5, 5.
As shown in FIG. 3, attach using stepped screws 10, 10. 10' is an elongated hole into which the head of the stepped screw 10 is fitted, and the seal body 9 is inserted into this elongated hole 1.
It is possible to move up and down with respect to the guide body 5 within the range of 0'.

Numerals 12 and 12 are springs fitted between the guide body 5 and the seal body 9, and even if the guide body 5 compresses the spring 12 and descends until its lower end touches the seal body 9, the knife 14 will not move. As shown in FIG. 8c, the length of each part of the tip is determined so that it does not protrude beyond the lower surface, that is, the sealing surface, of the heat-resistant rubber pressure bodies 11, 11 attached to the lower surface of the seal body 9. ing.

In the lower sealer 23, 24 is a lower body, which includes seal bodies 27, 2.
7 with bolt 28. Seal body 2
As shown in FIG.
It's always being pushed upwards.

In the grooves 31, 31 on the upper surface of the seal bodies 27, 27,
Pressure bodies 32, 32 are attached, and nichrome wires 33, 33 are attached to the pressure bodies 32, 32. In FIG. 7, 36 is a Teflon sheet for heat-resistant insulation that covers the nichrome wire 33.

Reference numerals 35 and 35 denote protruding plates that protrude from the seal bodies 27 and 27 at a constant interval, and both protruding plates 35 and 35
A knife 14 is inserted in the space between the two as shown in FIG. 8c.
The tip is inserted.

In FIG. 7, the bolt 37 is connected to the projecting plate 35,
35, seal body 27, 27, Teflon sheet 36
etc. shall be concluded in an integrated manner.

In FIG. 1, reference numerals 18, 18 are air cylinders, to which the respective outer ends of the knife holders 15, 15 are attached via connecting bodies 20, 20, and each knife that is joined at the center is actuated by the cylinder. The holders 15, 15 are each slid outward.
Knives 14' and 14' are attached to the inner ends of the respective knife holders 15 and 15, and under normal conditions, they come into contact with each other at the center of the upper sealer 3, and the knives 1
The tips of 4' and 14' coincide.

action of invention The effect will be explained.

The upper sealer 3 and the lower sealer 23 are lowered and raised by the operation of the air cylinder 2 and the air cylinder 22, and as shown in FIG. The lower surfaces of the pressurizing bodies 11, 11 and the upper surfaces of the protruding plates 35, 35 of the lower sealer 23 are sandwiched in the same position, and then, as shown in FIG. and the upper surface of the outer box 29 of the lower sealer 23.

At this time, the central portions of the films f, f' are slightly projected upward by the protruding plates 35, 35 of the lower sealer 23, and the knife 14 is still attached to the films f, f'.
It does not cut into f′.

Note that normally, the lower sealer 23 stops rising at the position shown in FIG. 8a.

When the lower sealer 3 further descends from the state shown in FIG. , 5 bend the spring 12 and descend until it hits the sealing bodies 9, 9, and between the pressurizing bodies 11, 11 of the upper sealer 3 and the outer case 29 and pressurizing bodies 32, 32 of the lower sealer 23. The films f and f' are clamped and the two films are sealed with the nichrome wires 33 and 33 of the lower sealer 23, and the knife 14 bites between the projecting plates 35 and 35 to remove the film f which is under tension in the same area. , f′.

Next, when the air cylinders 18, 18 are operated, the knife holders 15, 15 move outward from the center of the upper sealer 3, and the knives 14, 14' move the center parts of the films f, f'. cut.

In this case, the movement of the knife holders 15, 15 is as follows:
The knives 14, 14 are moved slightly longer than the distance L between them to completely cut the films f, f'.

In this device, the upper sealer 3 and the lower sealer 23 may be provided upside down, or the seal bodies 27, 27 of the lower sealer 23 may be integrated instead of being divided into two.

Effects of the invention Explaining the effects The device of the invention, when welding the upper and lower films and cutting them with a knife, the upper and lower films are clamped and sealed by the sealing bodies of the upper sealer and the lower sealer, and then the knife holder. By descending, all the knives on the upper surface of the film pierce the film uniformly. In particular, the knives whose tips coincide with each other at the center of the knife holder will stick into the film as they are, and the film will be cut by moving the holders to both sides at the same time. This completely eliminates the drawbacks of conventional devices that start cutting more sharply, the film can be cut sharply by each knife movement, and this speeds up the packaging process. .

[Brief explanation of drawings]

Fig. 1 is a front view of the device of the present invention, Fig. 2 is the A-A line in Fig. 1, Fig. 3 is the same B-B line, Fig. 4 is the C-C line, and Fig. 5 is the D-D line. The figure is a line E-E. FIG. 7 is an enlarged longitudinal sectional view taken along the line FF, and FIGS. 8 a, b, and c are longitudinal sectional side views of essential parts sequentially illustrating its operation. 3... Upper sealer, 4... Upper body, 5...
Guide body, 9...Seal body, 14...Knife, 1
4'...Central knife, 15...Knife holder, 23...Lower sealer, 24...Lower main body,
27... Seal body.

Claims (1)

[Scope of utility model registration request] Upper sealer 3 and lower sealer 23 are installed oppositely,
The seal body 9 is attached to the guide body 5 provided on the upper body 4 of the upper sealer 3, and the seal body 27 corresponding to this seal body 9 is attached to the lower body 24 of the lower sealer 23.
In the guide body 5 of the upper sealer 3, knife holders 15, 15 which are divided into two parts at the center are provided so as to be slidable outward in the width direction, and the knife holders 15, 15 have an oblique outer side. cutting blade 1
A film sealing/cutting device for a packaging machine in which a plurality of knives 14 each having a length of 4" are hung down, and adjacent knives 14', 14' are combined in the center so that their tips coincide with each other.