JPH0422763B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves inverting a bi-fold film that is unwound from a roll film to open the opening, and then guiding it vertically downward and folding the article into two from the opening. The present invention relates to a vertical packaging machine for bi-folded films, which seals and packages articles by melting and welding the opening edge of the film with an L-shaped sealing device after the films are dropped and inserted between the films.

(Prior Art) A long bi-fold film that has been folded in half in advance is transported horizontally, and the bi-fold film is opened via an opening mechanism disposed in the middle of the transport, and the opening part is opened. A packaging machine that inserts an article into the article, then cuts and simultaneously welds the open edge of the film that wraps the article using an L-shaped sealer to seal the article.
Broadly speaking, it can be divided into two types: horizontal method and vertical method.

Among these, a typical example of a horizontal type bi-fold film packaging machine is one in which a bi-fold film that is fed out in a horizontal plane is turned over 90 degrees in the width direction in approximately the same plane via an opening mechanism. The mouth is opened, and the article to be packaged is inserted into the opened film, and then the insertion part and side edges of the article to be packaged are cut and welded using an L-shaped sealer.
There is a horizontal packaging machine for double-folded film that is hermetically sealed.

Among this type of horizontal bi-fold film packaging machines, one of the models that has been put into practical use is
There is a horizontal packaging machine disclosed in Publication No. 20567.

This horizontal packaging machine is characterized by the article conveyance within the opening mechanism, and by inserting the article transfer belt into the opening device, it is possible to fold the double-folded film, which is open at one side edge in the width direction, into the opening device. It is characterized by the fact that the article passes through the opening device without contacting it, thereby eliminating misalignment between the opening edges of the two-folded film, and subsequently cutting and welding using the L-shaped sealer accurately. be.

To briefly explain its structure, it is a machine that wraps articles with synthetic resin bi-fold film.
A film opening device consisting of a pair of upper and lower right triangular guide plates, through which the article passes through, is provided in the middle of the transfer path for the packaged articles to the sealing device, and a film opening device is provided next to the film opening device, and the transfer path for the article is provided on the side of the film opening device. A feeding device is provided to feed the folded film perpendicularly to the
A two-fold film is opened by a film opening device, and the film is horizontally reversed approximately 90 degrees, and the article is placed on a transfer belt extending between the films opened from the entrance to the exit of the film reversing section in the opening device. The article is transferred into the bifold film starting from the outlet of the opening device without contacting the film, and then the opening edge on two sides of the bifold film surrounding the article is simultaneously melted and cut by an L-shaped sealer. Complete the sealed packaging by welding.

On the other hand, as a vertical packaging machine for bi-fold film, a plate-shaped or rod-shaped opening device is inserted between the two folded film pieces of the bi-fold film that hangs down due to the weight of the product or manual work from the roll film. The space between the two is expanded, and the article is placed between the two and sealed with a sealing device for hermetically sealed packaging.

(Problems to be Solved by the Invention) By the way, in the conventional horizontal packaging machine, the bifold film is transported in the horizontal direction even after passing through the opening mechanism as described above, so the packaging machine has a large installation area. In addition, special consideration is required to transport the product without disturbing the film within the opening mechanism, and the management of the packaging operation is also extensive and complicated, making it difficult to maintain efficiency. It wasn't the point. Furthermore, in addition to equipment such as transfer belts and inclined plates, the number of incidental equipment associated with these equipment also increases, making the entire apparatus complicated and causing the problem that the packaging machine becomes expensive.

On the other hand, in the above-mentioned conventional vertical packaging machine, since the direction of transport of the bi-folded film is basically vertical, it has the advantage that the installation area of the packaging machine can be narrowed and its management etc. can be made easier. The opening of the bi-folded film is done by inserting a plate-shaped or rod-shaped opening device, and the article is inserted between the opened films, so the opening is not secure and the operation of inserting the article is difficult. Not only is this extremely troublesome, but also discrepancies occur between the two pieces of the film afterwards, making it difficult to ensure that the sealer will cut and weld the film reliably.

The discrepancy between the two film pieces in this vertical packaging machine is incomparably larger than in a horizontal packaging machine. The reason for this is that after the packaged product is discharged from the packaging machine, the bi-fold film waiting to be wrapped next time simply hangs down with its lower end welded and one side edge of the bi-fold film open. If an article is inserted between the films in this state, the film will be unwound by its own weight, and at this time, the film may be twisted or the article may fall out of the opening, causing the two pieces of the film to separate. This causes a discrepancy.

In order to avoid such problems, it is necessary to allow a margin in the width of the film in advance, which has the disadvantage that the film cannot be used economically. Additionally, since a plate-shaped or rod-shaped opening device is inserted between each item and the items are placed between them, there is also the drawback that it is not possible to stack multiple items such as foam trays and package them all at once. was.

Among conventional packaging machines, the present invention aims to solve the above-mentioned problems peculiar to vertical packaging machines, which are particularly advantageous in terms of installation space and management. Vertical packaging for bi-folded film that can be applied to a machine, eliminate discrepancies between opening pieces on one side edge of a hanging bi-folded film, and also ensure that articles are inserted between both sides of the film for accurate sealing. The purpose is to provide a machine.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises: a film supply unit that horizontally supplies a bifold film with the folded part facing up and the opening part facing down; installed on approximately the same plane,
a film opening that guides the bifold film supplied from the film supply section vertically downward and flips it over to open a supply port for the packaged article; a pair of chain mechanisms disposed and pulling out the opening side edges of the reversal film vertically downward in a aligned state;
The gist of the machine is: an L-shaped sealer that simultaneously seals the opening side edge and the upper part of the reverse film that is pulled vertically downward from the opening; There is.

(Example) Hereinafter, the present invention will be specifically explained with reference to illustrated examples.

The figures show a vertical packaging machine for folded film, which is an embodiment of the present invention. Figure 1 is an overall perspective view, Figure 2 is a front view, Figure 3 is a plan view, and Figure 4 is a top view.
The figure is a left side view of the same, and FIG. 5 is a perspective view of the same essential parts.

According to this embodiment, a feeding device P for a bifold film f fed out from a roll film F is provided next to a film opening device M on a horizontal table R.
A film drawing device Q for drawing out the film f from the film opening device M is provided on the side edge of the film opening side of the sealing device T installed below the film opening device M.

The sealing device T is provided with a limit switch (not shown) that detects the position of the article a, and a discharge conveyor B is placed on the discharge side of the packaged article a' below the sealing device T.
is provided. On the opposite side of the film extractor Q from the discharge conveyor B, there is provided a winding drum D for winding up the cut tab _f3 fed out from the film extractor Q.

The film opening device M consists of a pair of left vertical guide plates 21 and right vertical guide plates 22, each of which has the same size as a right isosceles triangle. The inlet edge 2 is opened diagonally on the opposite side from the device P.
6 and 27 form an article input port 25, into which article a (in the illustrated example, a stack of several foam trays) is fed by a conveyor 20. The vertical sides of the left and right vertical guide plates 21 and 22 are disposed opposite to the film feeding device P, and serve as opening edges for opening the bifold film f fed out from the feeding device P into a left piece f ₁ and a right piece f _{2 .} 28 and 29 are configured. Further, the bottom portions of the left and right vertical guide plates 21 and 22 are connected to the upper ends of plates 23 and 24 that stand upright in parallel to the drop opening N of the horizontal platform R at a predetermined interval.

The left and right vertical guide plates 2 of the film feeding device P
At the rear facing the center of the vertical sides 1 and 22,
A feeding roller 30 for feeding out the roll film F is provided upright.

The sealing device T consists of an L-shaped sealer 31 and a seal pedestal 32, which both open and close.

The pull-out device Q for the film f is shown in FIGS. 2 and 5.
As clearly shown in the figure, the right chain 34 for speech and behavior in which the driving gears are meshed, and the right chain 3
The left chain 33 driven by the film f is rotated in a direction to pull out the film f vertically downward. More specifically, as shown in FIG. 4, it is provided on the side of the film opening side 40 of the sealing device T, and furthermore, as shown in FIG.
3 and 34 are attached to circulation guide plates 35 and 36, respectively, and the left and right pieces f ₁ and f ₂ of the open side 40 of the film f are bitten between each chain 33 and 34, and the film f is moved by the article a. It is designed so that it can be pulled out in the same direction.

The biting start point of the film f, that is, the pull-out start point O of the film pull-out device Q is provided as close as possible to the film opening device M. That is, the left and right chains 33, 34 and their guide plates 35,
The upper end of the sealer 36 is connected to the L-shaped sealer 31 of the sealing device T.
and at a position higher than the upper end of the seal pedestal 32,
It is arranged near the film opening device M.

When operating the vertical packaging machine, the film f is first set in an open state using the opening edges 28 and 29 of the opening device M. To do this, first the roll film F is passed through the feeding device P with the two-folded part 41 of the film facing upward, and then the left piece f1 of the two-folded film f that has been drawn out is passed through the left vertical guide plate ₂ of the opening device M. While placing the right piece f ₂ on the right side of the right vertical guide plate 22, press both left and right pieces.
f ₁ and f ₂ are the left and right vertical guide plates 21 and 22, respectively.
Fold it back at the entrance edges 26 and 27 and turn it inward. Then, since the entrance edges 26 and 27 of the left and right vertical guide plates 21 and 22 are both inclined downwardly by the same 45 degrees with respect to the feeding direction of the film f and the falling direction of the article a, the film f is located at the film opening. Vessel M
At the same time as the direction is changed to the falling direction of the article at the article input port 25 of
The left and right pieces f ₁ and f ₂ of the film f are overlapped and bitten between the left and right chains 33 and 34 of the pull-out device Q from the outlet of the opening device M, and are pulled down to the sealing device T.

In addition, the position of a limit switch (not shown) is adjusted appropriately according to the size and shape of the article a, and the film f of the drawer device Q is adjusted.
Adjust the length of the drawer each time using the gauge G. The length of the drawer approximately corresponds to the distance from the upper end of the sealer 31 to the position of a limit switch (not shown).

The operation of the packaging machine is started in this state. Initially, the sealing device T is operated idly to form the first melting and welding part at the tip of the film f, and the articles a are sequentially placed on the feeding conveyor 20. I'll put it on.

When the packaging machine starts operating, the film f opened from the film opening device M is transferred to the left and right chains 3.
3 and 34, it is pulled out a predetermined length, and its tip is drawn into the sealing device T. On the other hand, the article a sent from the infeed conveyor 20
falls from the opening device M into the sealing device T at the bottom, but at this time, the opening edge of the film f is sealed by the drawer Q to form a bag shape, so the product a is It enters securely between the left and right sides f ₁ and f ₂ of f, and is received by the welded part at the tip.
At the same time that the article a is accommodated, it is detected by a limit switch (not shown), and the L-shaped sealer 31 and seal pedestal 32 of the sealing device T are operated in the "close" direction to melt and weld the film f into an L-shape. , the article a is hermetically wrapped with a film f to form a packaged article a'.

This completely sealed article a' falls from the frame-shaped L-shaped sealer 31 by its own weight onto a discharge conveyor B provided below the sealing device T, and is carried out to the next process by the discharge conveyor B. be done.

Further, the cut lug f ₃ of the left and right chains 33, 34 that has been fused is automatically wound up by the winding drum D.

By fusing and welding the film f by the sealing device T, a fusing and welding part is formed at the tip of the film f each time, so the next falling article a will be caught by the fusing and welding part. Simultaneously with the stoppage, the limit switch is operated to operate the L-shaped sealer 31 and seal pedestal 32 of the sealing device T, and the above-mentioned operations are repeated, so that the articles a are sequentially and automatically packaged without waste.

FIG. 5 is a perspective view of a main part particularly illustrating stacking and packaging of articles.

The individual articles a are sequentially dropped from the feeding conveyor 20 into a bag-like film f located in the sealing device T so as to be stacked, and are stacked at the welded portion at the leading end of the film f. The height of stacking is determined by detecting a limit switch (not shown) set in advance at this position, and at the same time, the L-shaped sealer 31 and seal pedestal 32 of the sealing device T are operated, so that the films are stacked in the same manner as described above. Cut and welded and packaged in bulk.

〔Effect of the invention〕

As explained above, unlike the conventional vertical packaging machine, the present invention is equipped with a pair of right triangular vertical guide plates on the left and right sides as an opening device for bi-folded film, so that the film is unwound from the rear of the opening device. Not only can the bifold film be accurately redirected in the direction of the sealing device where the article falls, but it can also be opened wide at the article input section, making it possible to ensure that the article is inserted between the films. become. Moreover, the opening shape of the bifold film is always maintained in a constant shape at the entrance of the opening device, and the left and right ends of the film pulled out from the opening device are neatly aligned, so the film can be used economically with the minimum width. can.

Furthermore, by installing the drawer device, which is the most characteristic feature of the present invention, the bifold film is not restrained in any way as in conventional vertical packaging machines of this type, and the side edges are left open and simply hanging down. Unlike in other cases, the left and right sides of the bifold film are clamped and fixed in a aligned state, which prevents the film from moving freely and creates a bag-like shape with an open top.
Not only does the object not fly out from the film due to the force of the fall, but the edges of the film do not shift, allowing extremely stable operation. Furthermore, since the film of a predetermined length is actively pulled out by the pull-out device, and the film is fixed in that position after being pulled out, it is not only possible to accommodate the shape and size of the article, but also to prevent the fall of the article. Excessive film pulling out due to impact is avoided, and economical and stable operation is possible in this respect as well.

Of course, the vertical packaging machine of the present invention also achieves the space saving that vertical packaging machines have, and therefore the machine itself can be made extremely compact, and each device can be integrated into a caster as shown in the figure. If you attach a device such as the following, you can freely move it to any location and perform packaging work.

In addition, the packaging machine of the present invention is capable of stacking and packaging articles within the height range of the sealer device in accordance with the effects of the above-mentioned drawer device, and can stack and package multiple articles in addition to a single article. It is also an excellent vertical packaging machine that is unique in its ability to package in bulk.

[Brief explanation of drawings]

Fig. 1 is a perspective view of essential parts of a vertical packaging machine showing an embodiment of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a plan view of the same, Fig. 4 is a left side view of the same, and Fig. 5 is a It is a perspective view of the same main part. Explanation of the main parts of the symbols, M...Film opening device, P...Feeding device, Q...Drawing device, T...
... Sealing device, F ... Roll film, B ... Discharge conveyor, D ... Winding drum, O ... Drawer start point, R ... Horizontal table, N ... Drop port, a ...
(Packaged) Goods, a′...Packaged goods, 21, 22
... Vertical guide plate, 31 ... L-type sealer, 32 ...
Seal holder, 33, 34...Chain, _f1 ...Left film, _f2 ...Right film, _f3 ...Cut edge piece.

Claims (1)

[Scope of Claims] 1. A film supply unit that horizontally supplies a bi-folded film with the folded part facing up and the opening part facing down; installed in substantially the same plane as the film supply unit;
a film opening that guides the bifold film supplied from the film supply section vertically downward and flips it over to open a supply port for the packaged article; a pair of chain mechanisms disposed and pulling out the opening side edges of the reversal film vertically downward in a aligned state;
A vertical packaging machine for folded film, comprising: an L-shaped sealer that simultaneously seals the opening side edge and the upper part of the reverse film that is pulled vertically downward from the opening.