JPH0534206B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention involves opening a bi-fold film unrolled from a roll film, inserting an article between the bi-fold films through the opening, and using a sealing device to open the bi-fold film. The present invention relates to an article packaging device for sealing packaging by fusing and welding a film.

[Prior art]

A conventional device of this type is already known as Japanese Utility Model Publication No. 60-20567 filed by the present applicant. As shown in FIG. 1, this device includes a film opening device M consisting of a pair of upper and lower guide plates 6 and 7, through which the article to be packaged passes through a transfer path 1.
and a sealing device T following it, a feeding device P for a bifold film f is provided next to the film opening device M, and an article inlet 4 of the film opening device M is provided.
is opened obliquely in the direction opposite to the feeding device P, the entrance edges 11 and 12 of both guide plates 6 and 7 are both inclined at approximately the same angle with respect to the film feeding direction and the article transport direction, and Transport path 1 of a
A primary belt conveyor 1a leading from the rear of the film opening device M to the front sealing device T, and a secondary belt conveyor 1b following it are provided, and the upper and lower guide plates 6, 7 of the film opening device M are placed between the primary belt conveyor 1a and the secondary belt conveyor 1b. A space is provided between the primary belt conveyor 1a and the upper guide plate 6 through which the article a and the open film upper piece _f1 pass, and a space is provided between the primary belt conveyor 1a and the upper guide plate 6, and an open film is provided between the lower guide plate 7 and the open film. A space is provided for the lower piece f ₂ to pass through, and a welded part 1 is cut at the tip edge of the opened film for each seal of the article.
The horizontal piece 9 of the seal pedestal 8 of the sealing device T is placed between both the primary and secondary belt conveyors 1a and 1b so that the conveyor belt 8 can be opened. The structure was such that the film was drawn out from the outlet of M. Note that 15 and 16 are phototubes.

Furthermore, regarding the film drawer, the applicant filed a new invention on September 6, 1985 (Japanese Patent Application No. 198095, 1985). As shown in FIG. 2, the film drawer Q includes a horizontal piece of a seal pedestal between a primary inclined plate 21 and a secondary inclined plate 22, which are inclined so that the article to be packaged can slip out of the film opening device. 36, upper and lower chains 38, 39 are provided next to the secondary inclined plate 22, hanging over circulation guide plates 40, 41, and the film f is inserted between the upper and lower chains 38, 39. A drive gear was engaged with the lower chain 39, and the length of the film f to be pulled out could be adjusted using a separate control device.

However, in this conventional drawing device, the drawing start point O (the starting point of the film f biting in) was provided in the moving direction of the article, that is, on the side of the secondary inclined plate 22, rather than the horizontal piece 36 of the seal holder. The chains 38 and 39 pull the cut end 17 of the welded film, which tends to cause the film f to shift, and the stress concentrates on the corner 18 of the L-shaped welded weld. There have been cases where the portion 18 has been torn.

Furthermore, when the article to be packaged slips through the film opening device and is caught by the film fusing and welding part, the film f is often pulled to the opposite side of the chains 38 and 39 by the force of the article's slipping and is displaced. This shift often causes a great deal of inconvenience the next time the film is pulled out by the chain, forcing unstable operation. Conventionally, as a countermeasure to this problem, an unnecessarily wide film was used to allow for a certain degree of deviation to confirm the workability, but this was extremely wasteful.

[Purpose of the invention]

This invention aims to solve the above-mentioned drawbacks of conventional film drawing devices, and is designed to prevent the film from tearing due to the pulling force of the upper and lower chains, and to prevent the film from shifting due to the pulling force or the movement of the packaged article. The object of the present invention is to provide an article packaging device using a folded film.

[Structure of the invention]

That is, in order to achieve the above object, the present invention has a structure in which the drawing start point of the film drawing device is provided at a position that projects further toward the film opening device than the seal holder of the sealing device, and the drawing start point of the film drawing device is provided at a position that projects toward the film opening device side than the seal holder of the sealing device. The gist of the present invention is that a mounting platform for the upper and lower film pieces is constructed between the position near the drawing start point and the seal holder.

〔Example〕

FIGS. 3 to 6 show an embodiment of the present invention, and the transport path R through which the packaged article a flows is
Each of them is composed of a horizontal primary belt conveyor _C1 , a secondary belt conveyor _C2 , and a film platform S between them, and this transfer path R is provided with a film opening device M and a sealing device T following it. ,
A film feeding device P is installed on one side of the film opening device M.
A film drawing device Q is provided on one side of the sealing device T.

The film opening device M is the primary belt conveyor C ₁
It consists of an upper guide plate 23 above and a lower guide plate 24 directly below, separated from each other by a pair of right and left supports 25 and 26 that sandwich the primary belt conveyor _C1 so that the article a can pass between them. 23, 24
are integrally connected, and an inlet 27 for the article a is opened obliquely on the opposite side of the feeding device P.

That is, both guide plates 23 and 24 of the opening device M are both right-angled isosceles triangles of the same size, and the oblique sides opposite to the right angle portions are positioned as the entrance edges 28 and 29 of the article a, and the entrance edges 28 and 29 are 45 for both the film f feeding direction and the article transporting direction.
The angle of inclination is in degrees.

In this embodiment, the film opening device is a triangular guide plate, but the structure of the film opening device is not limited to this example, and may be a triangular member such as a rod shape or a rod shape.

The film feeding device P is provided with a feeding roller 31c below a pair of rollers 31a and 31b that receive the rolled film F, and the feeding roller 31c is located at a height approximately in the middle between the upper and lower guide plates 23 and 24. be.

The sealing device T includes an L-shaped roller 35 that opens and closes.
An L-shaped seal pedestal 36 is provided below, and the horizontal piece 37 of the seal pedestal 36 is connected to the landing platform S and the secondary belt conveyor.
It is located between C ₂ (Figure 4).

The boarding platform S includes a plurality of free rollers 32, each of which is pivotally supported by a support frame 33.
Further, the outer circumferential surface of each roller 32 is coated with rubber or soft plastic material to impart cushioning properties to the outer circumferential surface, thereby alleviating collisions with the packaged articles. And this boarding platform S
A space 49 is provided between the primary belt conveyor C ₁ and the primary belt conveyor C 1 for allowing the lower film piece f ₂ to float up from the primary belt conveyor C ₁ .

The film drawing device Q consists of a lower chain 39 for driving, which is meshed with a driving gear 42, and an upper chain 38 driven by the lower chain 39. The upper and lower pieces f ₁ and f ₂ on the open side of the film f are pushed together between the chains 38 and 39, so that the film f can be pulled out in the direction of movement of the article a.

In particular, in the device of the present invention, the film drawing start point O of the drawing device Q, that is, the starting point of the film biting, is located at a position that projects further toward the film opening device M than the seal pedestal 36, and is placed next to the board S. It is provided.

When operating the above-mentioned article packaging apparatus, first the film f is set in an open state using an opening device M. To do this, first, the rolled film F is placed on the feeding device P with the film folded in half 49a facing opposite to the flow direction of the article a, and then the upper piece f ₁ of the drawn film F is placed on the opening device M. while inserting the lower piece f ₂ under the lower guide plate 24, fold the upper and lower pieces f ₁ and f ₂ at the entrance edges 28 and 29 of the guide plates 23 and 24, respectively. Turn it inside. Then, the entrance edges 28 and 29 are aligned with the feeding direction of the film f and the article a.
The film f is placed at the entrance 27 of the opening device M in such a manner that both of them are inclined at the same 45 degrees with respect to the transport direction of the opening device M.
Then, the direction is changed to the transport direction of the article a, and the film f is turned upside down and opened, and the end of the film f is pulled out from the outlet of the opening device M.

At this time, the lower piece f ₂ of the film is under the primary belt conveyor C ₁ , so it is pulled upward from the space 49 at its tip, and with the upper and lower pieces f ₁ and f ₂ superimposed, the pull-out device Q is opened. Upper and lower chain 3
8, 39 and pull it out to the sealing device T.

The operation of the packaging device is started in this state. First, the sealing device T is operated idly to form the first welded part 50 at the tip of the film f, and then the articles a are sequentially placed on the primary belt conveyor _C1 . Put on. The article a transferred by the primary belt conveyor _C1 enters the film f opened by the film opening device M, and is then pushed onto the platform S by the primary belt conveyor _C1 . When the article a reaches the vicinity of the welded part 50 at the tip of the film f, it is sensed (sensor not shown) and the upper and lower chains 38, 3 of the pull-out device Q are
9 operates, the film f is opened by the opening device M.
pulled out from the body and moved forward as a whole.

Since the lower film piece f ₂ rides on the platform S, the article a pushed onto the platform S moves forward as the film f moves, with the lower film piece f ₂ placed under it. It is sent to the sealing device T. Then, the article a is placed on the horizontal piece 37 of the seal holder 36.
When the film is completely transferred onto the secondary belt conveyor C ₂ , the seal pedestal 36 moves upward and the L-shaped sealer 35 moves downward, so that the upper and lower film pieces f ₁ and f ₂ become L-shaped. By fusing and welding, the article a is completely sealed to the film fa, and at the same time, a fusing and welding portion 50 is formed at the tip of the film f.

Furthermore, when the article a is completely transferred onto the secondary belt conveyor _C2 , this is sensed and the pull-out device Q is stopped, the film f is no longer drawn out, and the welded part 50 at the tip thereof is stopped. ,
When the next article a is pushed onto the platform S by the primary belt conveyor _C1 and reaches the vicinity of the welding section 50, the film f is pulled out from the opening device M by operating the pull-out device Q again as described above. At the same time, the article a is transferred onto the secondary belt conveyor _C2 , and then the sealing device T is activated to seal and package the article a in the film fa.

The film drawing device Q is provided with its drawing start point O, that is, the part where the film bites into the film, at a position that projects further toward the film opening device M than the seal holder 36 of the sealing device T (Fig. 4). 38 and 39 are always holding not only the cut end 51 of the film f, but also the uncut portion 52, so that when the film is pulled out, the pulling force is applied directly to the uncut portion 52, and is not applied to the corner portion 53 of the L-shaped cut. Since almost no force acts on the corner 5
The so-called ear cut, where 3 is torn, never occurs.

In addition, in a close state where both the upper and lower pieces f ₁ and f ₂ of the film are on the platform S, the upper and lower chains 38 and 39 bite into the upper and lower pieces f ₁ and f ₂ , so that both the upper and lower pieces f ₁ , Unlike the case where f ₂ is separated vertically by the platform S, there is no force in the biting of both pieces f ₁ and f ₂ , and the biting progresses with a constant protruding width, which prevents film shift and Since there is no escape, the width of the protruding portion 54 can be reduced as much as possible.

Further, after the upper and lower chains 38 and 39 have bitten together the upper and lower film pieces f ₁ and f ₂ , that is, when the chains 38 and 39 are stopped after welding, the article a is pushed into the upper and lower film pieces f ₁ and f ₂ . Therefore, even if the film f is subjected to a force when the article a is pushed in, the upper and lower film pieces f ₁ and f ₂ will not be disengaged due to the force, and the width of the protruding portion 54 will be reduced. Unlike the case of this embodiment, even if the article a is slipped due to
Even if the film is pushed between the upper and lower film pieces f ₁ and f ₂ , the size of the protruding portion 54 will not change due to the falling impulse, and the corner portion 53 will not be torn.

[Other Examples]

FIG. 7 shows another embodiment of the riding platform S, in which a plate on which the film f can easily slide is used for the riding platform S, and the structure is simplified.

FIG. 8 shows still another embodiment, in which the belt 55 of the secondary belt conveyor _C2 is formed longer than the length needed to stretch it between the front and rear rollers 56, 57, and the horizontal piece 37 of the seal pedestal is primary belt conveyor
A pair of front and rear rollers 58, 59 are separately provided between _C2 .
A pair of upper and lower rollers 6 is provided below the horizontal piece 37.
0 and 61, and by hanging a part of the belt 55 on the upper and lower rollers 60 and 61, the seal holder 37
pass under the front and rear rollers 58, 5.
By multiplying by 9, the boarding platform S is constructed.

When the platform S is configured in this way, the upper surface of the platform S moves forward together with the secondary belt conveyor _C2 , so the opening device M is moved by the pull-out device Q.
This helps when pulling out the film f from the tray, making it easier to pull it out.

In addition, regardless of the secondary belt conveyor C ₂ ,
The boarding platform may be configured by a separate belt conveyor.

〔Effect of the invention〕

As explained above, in this invention, since the drawing start point of the film drawing device is provided in a position that projects further toward the film opening device side than the seal holder of the sealing device, a tear is created at the corner of the L-shaped cut of the film. This can be prevented from occurring. In addition, a mounting platform for the upper and lower film pieces is constructed between the position near the drawer start point and the seal holder in the transport path for packaged items, so that the upper and lower film pieces do not come off on the upper and lower chains of the drawer. You can make it bite,
Since the film does not shift due to the force of pulling out the film or the movement of the packaged item, economical use of the film is possible by reducing the amount of unnecessary protrusion of the upper and lower pieces of the film from the upper and lower chains. It exhibits excellent effects such as:

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional packaging device, and FIG. 2 is a perspective view of a film drawing device in the conventional packaging device. 3 to 6 show one embodiment of the present invention, FIG. 3 is a perspective view, FIG. 4 is a sectional view seen from a plane, FIG. 5 is an explanatory view showing the film being pulled out, and FIG. The figure is an enlarged sectional view of the main part. 7th
The figure is an enlarged sectional view of a main part according to another embodiment, and FIG. 8 is an enlarged sectional view of a main part according to still another embodiment. O...Drawer starting point, M...Film opening device,
P... Feeding device, Q... Pulling out device, R... Transfer path, S... Riding platform, T... Seal device, a...
Article to be packaged, f...Film, _f1 ...Film top piece, f2...Film bottom piece, 23, ₂₄ ...Guidance plate, 36...Seal pedestal, 38, 39...Chain.

Claims (1)

[Claims] 1. A film opening device consisting of a pair of upper and lower triangular members through which the article passes through, and a sealing device following the film opening device are provided in the transfer path of the packaged article, and the upper and lower film pieces are both attached to the side of the film opening side of the sealing device. In an article packaging device using a bifold film, which is provided with a film drawer device consisting of at least an upper and lower chain that bites, the drawer start point of the film drawer device is provided at a position that projects further toward the film opening device than the seal holder of the sealing device, and 1. An article packaging device for bi-folded film, characterized in that a mounting platform for upper and lower film pieces is formed between a position near the drawer start point and a seal holder in a transport path for packaged articles.