JPH0140803Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a film to cover an object in a cylindrical shape, and then cuts and separates the object to be packaged. In the process of sequentially bending and crimping the ears to the lower side of the package, the rear end film ear of the intermediate package is folded first, and then the front film ear is folded and transferred. An air blowing nozzle is provided between the roller conveyor and the second suction opening for folding the rear edge of the film which has already been folded, and the roller conveyor, and the timing of the air blowing from the nozzle is determined by the movement of the intermediate package. Prevention of separation of the trailing film edge of the intermediate package by blowing pressurized air onto the trailing edge of the intermediate package in synchronization with the process. Regarding equipment.

Conventionally, a film is used to wrap an item to be packaged, and at the same time, the film's strong self-adhesiveness is used to seal both edges of the film, making it into a cylindrical shape and cutting the film leaving an appropriate length to form the front and rear films. After that, the front and rear film edges are passed over a suction device, pulled down by the suction force, and while the film moves further forward, it is bent and crimped to the underside of the intermediate packaging body to package it. Automatic packaging machines were used.

However, there is a tendency to stop using films with strong self-adhesiveness (eg, PVC films) for food hygiene reasons, and to use films with weaker self-adhesiveness (eg, polyethylene films).

When a film with low self-adhesiveness is used in the conventional automatic packaging machine described above to automatically package items, the rear film edge of the intermediate package that has been folded and crimped becomes the front film edge. When passing over a suction device for bending, the suction force causes the sheet to be peeled off (because the adhesive strength is weak), resulting in an unfavorable packaged product.

The means to eliminate the defects mentioned above are
A variety of techniques have been developed, and one known technique is to stop the suction in synchronization with the travel timing of the intermediate package when the trailing film edge, which has been bent and crimped first, reaches the suction device for folding the front edge film edge. An attempt was made to do so.

However, although the above method is effective when the packaging is fed at a slow speed of about 30 to 40 pieces per minute, if the feeding speed is increased, the suction cannot be shut off and released reliably, so There was a drawback that the trailing edge of the film was sucked.

Therefore, an earlier application by the same applicant as the present application (Jitsugan Showa)
No. 56-119738), it is possible to reliably prevent peeling of the trailing edge of the film even during high-speed work without being affected by the feeding speed of the package, and it is possible to bend the leading edge of the film under strong suction force. In order to obtain a beautiful package with no wrinkles on the package film, a shutter plate is slidably provided in the second suction opening and operates in synchronization with the passage of the front film edge of the package. blocking the second suction opening;
By opening it, strong suction is applied when the front end film edge is folded, and when the rear end film edge of the intermediate package passes, the rear end film edge of the intermediate package that has been folded earlier is prevented from peeling off. It has been made possible to do so.

However, if the upper part of the opening of the second suction device is simply opened and closed by the shutter device, even when the shutter is closed (actually, if the shutter is completely closed, the front edge of the film cannot be pulled out after being bent, so there is a slight gap). The film has a defect in which the rear edge of the film, which has been bent forward, is sucked and peeled off due to the suction force.

The technical problem of this invention is to prevent the initially folded trailing edge of the film from separating when the intermediate package passes over the second suction opening, even if the film has weak or almost no self-adhesion. Our goal is to provide a packaging machine with improved work efficiency.

The structure of the present invention, that is, the technical means for achieving the above technical problem is as follows.

In a film edge folding device for an automatic packaging machine in which a shutter plate that operates in synchronization with the movement of the intermediate package is provided above a second suction opening so as to be openable and closable, the film edge folding device is provided between the second suction opening and the roller conveyor. An air blowing nozzle is provided at the air blowing nozzle, and the timing of air blowing from the air blowing nozzle is synchronized with the movement of the intermediate packaging (when passing through the rear end portion), and pressurized air is applied to the intermediate packaging. The present invention is such that the air is sprayed obliquely from below to above the intermediate package in the direction of travel.

With the above-mentioned technical means, the rear end film edge of the intermediate package that has been bent and crimped first can exhibit a separation prevention mechanism using pressurized air that is blown in synchronization with the approach to the second suction opening. ,
Since it is not affected in any way when passing through the second suction opening, there is no reduction in the feeding speed of the intermediate package, and the packaging work efficiency can be further improved, providing an exceptional effect.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

Figure 1 is a reference diagram showing the device of the present invention installed in an automatic packaging machine. Both end edges of the film are tightly held by the inclined belts 4, 4, and the film is advanced and lowered under tension.

Reference numerals 5 and 5 indicate claws of a feeding device provided in contact with the front part of the machine body, and the packages 11, 11... fed by the claws 5, 5... are made of film tightly stretched by the inclined belts 4, 4. When fed inside, both edges of the film moving forward together with the packages 11, 11, .

Package 1 wrapped in a cylindrical shape with a film
The side ends of 1, 11, . . . are conveyed while being held between both sides by a pair of side conveyors 10.

Reference numeral 12 denotes a roller conveyor provided below the side conveyors 10, 10, and the roller conveyor 12 has a large number of rollers 14, 14... rotatably pivoted to endless chains 13, 13 running in parallel. Air space 1 at a predetermined position
5, 15...

The running speed of the roller conveyor 12 is faster than the speed of the side conveyor 10, that is, the moving speed of the package 11.

Reference numeral 16 denotes a film cutting device, which wraps the packaged object in a cylindrical shape with a well-known film (not shown), cuts the advancing film leaving an appropriate length, and cuts the film edge portions 17 at the front and rear ends. 18.

Reference numeral 19 denotes a first suction opening, which is connected to a well-known suction device, and is connected to the film cutting device 16.
When the trailing edge film edge 18 is cut and formed by the roller, it is sucked downward, and when the trailing edge film edge 18 is sucked and held, it travels faster than the package 11 described above. The intermediate package is formed by being bent and pressed against the lower surface of the package 11 by the rollers 14 and pressed onto the lower surface of the package 11.

Reference numeral 20 denotes a second suction opening, which is disposed close to the front of the roller conveyor 12 in the traveling direction, and has a shutter plate 21 on the upper surface of the second suction opening 20 that temporarily blocks air suction. is provided so that it can be opened and closed freely.

In the second suction opening 20, an air passage 23 is formed between a pipe 22 on the side of a well-known suction device and an air suction port 24 formed wider than the film edge width.

Reference numeral 25 denotes an air blowing nozzle, which is connected to a well-known blower device via a pipe 37 and synchronized with the drive of the packaging machine via a well-known solenoid valve (not shown).
The second compressed air is sprayed in accordance with the movement of the rear end film edge of the intermediate package.
It is arranged between the suction opening 20 and the roller conveyor 12.

The shape of the air blowing nozzle 25 is determined depending on the required size of the packaging machine, but it is usually a hollow round pipe whose width approximately matches the width between the rollers 14 or the side conveyors 10, 10. preferable.

Moreover, the ejection hole 33 of the air blowing nozzle 25,
33... or the ejection slits 34 are formed to be inclined slightly upward in the advancing direction of the intermediate package 11 as shown in FIG. The width is preferably selected appropriately depending on the size or speed of the intermediate package 11.

The reason for this is that if the pressurized air ejected from the air blowing nozzle 25 is too weak, it cannot overcome the residual pressure at the second suction opening, and the rear end film edge of the intermediate package during travel. This is because it is not effective in preventing separation.

Further, as shown in FIG. 6, the spray nozzle 25 is slidably fitted with pipes 35 and 36, so that the amount of pressurized air ejected can be adjusted according to the size of the intermediate package. .

Reference numeral 26 in the figure is a driving roller chain, which is connected to a driving mechanism of an automatic packaging machine (not shown).

27 is a sprocket, 28 is the first suction opening 1
9 is a hose, 29 is a drive sprocket, 30 is a machine frame, 31 is a chute conveyor, and 32 is a drive lever for moving the shutter plate 21 forward and backward.

Next, bending and crimping the front and rear film edges,
Prevention of peeling of the trailing film edge will be explained.

Package 1 wrapped in a cylindrical shape with a film
When the films 1, 11, .

The rear end film lug 18 of the package 11 passes through the space 15 of the roller conveyor 12 and is sucked down by the first suction opening 19 and is strongly pulled downward.

In this state, the rear end film edge 18 is attached to the packaging body 11.
The packaging body 11 is bent downward by the roller 14 which advances at a faster speed, and the packaging body 1
1 to form an intermediate package.

Subsequently, the intermediate package 11 is advanced by a pair of side conveyors 10, 10, and when the front end film ear portion 17 of the intermediate package 11 reaches the open second suction opening 20, it is sucked downward by the suction force. When the film is moved forward in this state, the front edge of the film is bent to the lower part of the intermediate package 11.

At this time, the shutter plate 21 moves in the closing direction.

Further, the intermediate package 11 moves forward, and before the rear end reaches the upper part of the second suction port, a solenoid valve (not shown) is opened, and the rear end film edge that has been bent first is attached to the lower surface of the intermediate package 11. The part 18 is actively blown onto the lower surface of the intermediate packaging body by blowing up the pressurized air, and in that state, the part 18 is connected to the second suction opening 20.
pass through the top of the

Therefore, the rear end film is conveyed to the edge portion 18 without being subjected to any suction action, and is transferred to the shoot conveyor 3.
1.

Since the present invention is constructed as described above, for example, when packaging an intermediate package containing items in a tray using a film with weak or almost no self-adhesiveness, the film is first folded and crimped. The end film selvage is compressed and protected against the lower surface of the intermediate packaging body by pressurized air jetted from an air blowing nozzle just before passing through the second suction opening that bends the front end film selvage.
It has the characteristic that it is conveyed without being separated when passing through the suction opening, making it possible to obtain packaged products with high commercial value.

Although the movement of the shutter plate that opens and closes the second suction opening is illustrated and explained using a lever as one of the embodiments, the present invention is not limited to this lever, and for example, a hydraulic cylinder and a piston rod. A person skilled in the art can easily select whether to use mechanical operation such as the above, or electrical operation such as a solenoid valve, electromagnetic clutch, etc., as required.

Furthermore, since these are not the gist of the present invention, illustrations and explanations are omitted.

[Brief explanation of the drawing]

Fig. 1 is an overall front view showing the device of the present invention installed in an automatic packaging machine, Fig. 2 is an enlarged view of the main part of the device for preventing separation of the trailing film edge of the present invention, and Fig. 3 is the 4th enlarged sectional view showing the relationship between the tip film ear and the shutter plate in the suction opening;
The figure is an enlarged sectional view showing the jetting state of the air blowing nozzle that operates in synchronization with the approach of the trailing film edge to the second suction opening, and Figure 5 shows the relationship between the air blowing nozzle and the second suction opening. An enlarged sectional view showing the relationship; FIG. 6 is a sectional view showing another embodiment of the air blowing nozzle;
FIG. 7 is a sectional view taken along the line A--A in FIG. 6. 10: Side conveyor, 11: Intermediate package, 1
2: roller conveyor, 13: endless chain, 17: front end film ear, 18: rear end film ear, 19: first suction opening, 20: second suction opening, 21: shutter plate.

Claims (1)

[Scope of utility model registration request] A roller conveyor consisting of a running endless chain with many rollers rotatably attached to it.
Provide one or several spaces at each predetermined pitch,
A pair of side conveyors that run at a slower speed than the roller conveyor and sandwich and convey the package are disposed above the roller conveyor, and the trailing edge of the film is sucked at a required location on the lower surface of the upper running surface of the roller conveyor. A first suction opening is provided at the front of the roller conveyor in the direction in which the film travels, and a second suction opening is provided at the front of the roller conveyor to suck the front edge of the film so that the intermediate package in which only the edge of the rear film is folded in can be moved. In a film edge folding device in which a shutter plate that operates synchronously is provided above the second suction opening so that it can be opened and closed, air is drawn between the second suction opening that sucks the front end film edge and the roller conveyor. A blowing nozzle is provided, and the timing of air blowing from the air blowing nozzle is synchronized with the movement of the intermediate packaging body, so that pressurized air is blown onto the trailing edge of the film of the intermediate packaging body. A device for preventing separation of a rear end film edge of an intermediate packaging body which is bent and crimped to the lower side of the packaging body.