JPH0333603Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an improvement in a bi-fold film opening device which is used in a device for wrapping articles with synthetic resin bi-fold films, and is capable of smoothly opening the bi-fold film unrolled from a roll film.

[Conventional technology]

Conventionally, this type of opening device for a double-folded film has been proposed, for example, as seen in the invention of a device for opening a double-folded film in an article packaging device in Utility Model Publication No. 60-20567. A film opening device consisting of a pair of upper and lower guide plates that pass through the space, and a sealing device following the film opening device are provided.A bi-fold film feeding device is provided next to the film opening device, and the product entrance of the film opening device is connected to the bi-fold film. In an article packaging device using a bi-folded film, the opening is diagonal in the opposite direction of the feeding device, and the entrance edges of both guide plates are inclined at approximately the same angle with respect to the film feeding direction and the article transporting direction. A primary belt conveyor leading from the rear of the film opening device to the sealing device in front of the film opening device and a secondary belt conveyor following it are installed in the transfer path, and the upper and lower guide plates of the film opening device are opposed to each other with the primary belt conveyor sandwiched between them. At the same time, a space is provided between the primary belt conveyor and the upper guide plate for the article and the upper piece of the open film to pass through, and a space is provided between the primary belt conveyor and the lower guide plate for the article and the lower piece of the open film to pass through. The horizontal piece of the seal pedestal of the sealing device is arranged between the primary and secondary belt conveyors so that a welding part is created at the leading edge of the opened film for each seal of the article, and the sealing pedestal of the sealing device is placed between the primary and secondary belt conveyors, and the leading edge of the film is melted and welded. A known technique is known in which the film is pulled out from the outlet of the opening device by hanging the article to be transferred. However, in the above structure, the guide plate is formed into a triangular plate shape, and the film is folded back and reversely opened by the tip edge of the guide plate, but since the film surface comes into contact with the edge of the guide plate, frictional resistance occurs. However, there is a drawback that it cannot be pulled out smoothly because it gets caught on the edge and becomes lopsided or misaligned. In particular, since the vertically opposing guide plates do not have folded edges that extend vertically, the part of the film that is folded and becomes the inner center will not be guided except at the corners of the guide plate, and if there is large friction, it will not be folded back evenly. There are drawbacks. Furthermore, since the guide plate is pulled out by the folded film, a force is applied in the drawing direction, but unless a constant tension is applied to this, the folded film cannot be opened evenly.

[Problem that the invention attempts to solve]

This idea was devised in view of the above circumstances, and its main problem is that it has a simple structure that only requires stretching a wire material, and can guide the inside center when folding a half-folded film. To provide an opening device for a folded film capable of exerting uniform tension even when adjusting the height of an opening guide member.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention provides a height-adjustable pair of upper and lower parts in the transport path for the packaged goods so that the goods can pass through the space, and also includes an edge that diagonally crosses the transport path and an edge between the transport path. a film opening guide member having a corner portion with an edge portion extending in the longitudinal direction and a tip end connected to each other;
and a sealing device disposed behind the film opening guide member, and a bifold film feeding device is provided next to the film opening guide member, and the product entrance side of the film opening guide member is directed in the direction opposite to the bifold film feeding device. In a bifold film opening device in which the opening is oblique to the upper and lower film opening guide members, and the entrance edges of the upper and lower film opening guide members are inclined at approximately the same angle with respect to the film feeding direction and the article transporting direction, the wire material is Stretch it like this. (a) Fix the proximal end of the filament in one place that does not move up and down in conjunction with the height adjustment of the film opening guide member, and pass it through the corner of one of the film opening guide members or directly. (b) the wire material is fixed to a corner of one of the film opening guide members; (c) extends from the first guide receiver at different angles in the forward direction of the transfer direction of the transfer path and is interlocked with the height adjustment of the film opening guide member; (d) From the spanning position between the corners, the wire material extends upward or downward, which is the direction in which the wire material extends, approximately vertically at a different angle. (e) A technical measure is taken in which the extending end is fixed at the other location where it does not move up and down in conjunction with the height adjustment of the film opening guide member.

[Effect]

The wire material is stretched with both ends fixed in a fixed position, and is stretched almost vertically at the corner of the film opening guide member to form a vertical guide part, so that it is stretched between the upper and lower film opening guide members. Move freely Guide the middle part of the film as a folded edge,
The half-folded film can be smoothly pulled out by folding it back into a substantially straight line to correct the bending. In addition, the above-mentioned wire material is stretched with a constant tension, and even if the height of the film opening guide member is adjusted, the second guide receiver moves up and down in conjunction with the height adjustment, so that the film opening guide member does not move up and down. The same tension can be maintained.

【Example】

An embodiment in which the bi-fold film opening device of this invention is used in an L-sealer packaging device will be described below with reference to the drawings. The opening device for a double-folded film shown in FIGS. 1 to 4 includes a primary conveyance path 1 leading to a sealing device 3;
A secondary conveyance path 2 is provided from the sealing device 3 to a heat tunnel (not shown) for heat shrinking the film. Both the primary conveyance path 1 and the secondary conveyance path 2 are composed of belt conveyors, and a roll film feeding device 4 is provided on the side of the middle part of the primary conveying path 1. A folded film opening device 5 of this invention is provided. The bifold film opening device 5 is composed of an upper film opening guide member 6 spaced apart above the primary conveyance path 1, and a lower film opening guide member 7 spaced apart parallel to the hanging position, and the height can be adjusted. One end of an upper film opening guide member 6 and a lower film opening guide member 7 are fixed to a pair of transfer frames 9a and 9b which are vertically moved up and down by a device 8. The film opening guide members 6 and 7 are connected to an edge portion that diagonally crosses the primary conveyance path 1.
It consists of a hollow pipe bent in an inverted rectangular shape with an edge extending along the longitudinal direction and a tip connected to each other and having a corner, and the inlet edge 6a, 7a where the bi-folded film f is reversely opened. Multiple fumaroles H, H...
are drilled at approximately regular intervals. Further, one end of the film opening guide members 6, 7 is connected to the constant pressure air supply device A, and the other end is fixed and closed to the movable frames 9a, 9b as described above. As shown in the figure, the supplied air at a constant pressure passes through the hollow part of the pipe and is ejected from the blowhole H at a prescribed pressure, forming a gap between it and the bifold film f drawn in the direction of the arrow. It flows out in a direction like this. Here, the air supply device may be any device that supplies air at a constant pressure, and for example, any known structure such as a blower or a structure in which a compressor and a regulator are connected can be used as appropriate. The transfer frames 9a and 9b are provided with a height adjustment device 8.
The upper transfer frame 9a is movable up and down. Here, the height adjustment device 8 rotates a handle 8H formed at the tip of a rotating shaft 8A that protrudes to the side, thereby adjusting an operating shaft 8B with a thread through a conversion mechanism such as a bevel gear. Rotate and upper transfer frame 9
Nut-shaped receiving part 8C and operating shaft 8B fixed to a
Although the height adjusting means is configured to move up and down by screwing it forward and backward, other known height adjusting means may be used. In addition, 8G in the figure is a pair of guide shafts for moving the upper and lower transfer frames 9a and 9b in parallel. The shape formed by the upper and lower film opening guide members 6, 7 and the upper and lower moving frames 9a, 9b is a right-angled isosceles triangle. The sides that are connected (fixed) are arranged at approximately right angles, and the corner of the above triangle is located in the extending part, and the extending side is bent at an angle of about 45 degrees from the corner and gradually slopes. Both of the moving frames 9a and 9b have a shape in which they abut each other at about 45 degrees and extend their extending ends toward the air supply device side. And upper and lower film opening guide members 6,
Reinforcement plates 61 and 71 are fixed to the tip corner portions of 7, respectively. The upper and lower film opening guide members 6 and 7 configured in this manner always maintain a constant tension even when the height is adjusted by the tension maintaining means 30 made of stretched wire material. It is becoming possible to maintain it. In the case of this embodiment, this tension maintaining means 30 has one end of a flexible wire W fixed to a hole 71H of a reinforcing plate 71 fixed to the tip corner of the lower film opening guide member 7, and the wire W is a reinforcing plate 6 that is stretched vertically directly above therefrom and is fixed to the tip corner of the upper film opening guide member 6.
1 It passes through the hole 61H serving as the first guide receiver, changes direction at a substantially right angle, is stretched in the horizontal direction, and extends in the traveling direction of the primary conveyance path 1, and its extended portion is provided on the upper moving frame 9a. Guide 9 serves as the second guide receiver.
g, then change direction approximately at right angles, extend vertically, and attach the extending end to a stand 31 fixed to the base of the packaging device via a spring 32 so that the above-mentioned corner is located above the wire W. It consists of a fixed structure. In the present invention, it is not necessary to interpose the spring 32 to fix the wire W to the stand 31, but it is preferable to use the buffering force of the spring 32 or other elastic body because the tension can be kept constant more smoothly. With this structure, the fixed length of the flexible wire W is only fixed at both ends by the stand 31 and the reinforcing plate 61 of the lower film opening guide member 6, and the upper moving frame 9a can be adjusted in height. Even if the wire W moves up and down due to the operation of the device 8,
Since the wire W passes through the guide 9g and the hole 61H of the reinforcing plate 61 of the upper film opening guide member 6 without changing the tension, a constant tension is always maintained between the upper and lower film opening guide members 6, 7
can be given to Further, the wire W is stretched between the corners of the upper and lower film opening guide members 6 and 7, and a vertical guide portion W' extending vertically is used as a guide edge for folding the film. That is, when the folded edge f3 side of the half-folded film is folded back, the upper and lower film opening guide members 6,
7, but since the vertical guide portion W' guides the middle portion as a folded edge, the bending is corrected and it can be pulled out smoothly. In order to use this bi-fold film opening device 5, the roll of bi-fold film f is opened at its folded edge f.
3 is set in the feeding device 4 with the packaged article G facing oppositely to the conveyance direction. Then, the upper piece f1 of the bifold film f pulled out from the film roll is placed on top of the upper film opening guide member 6, and while the lower piece f2 is inserted under the lower film opening guide member 7, both the upper and lower pieces are The inner surfaces f1' and f2' are the entrance edges 6a and 7a of the film opening guide members 6 and 7, respectively.
It can be folded back and the folded edge f3 side can be turned inside the vertical guide portion W' to open it in a reverse opening state (see Fig. 5). This is because the entrance edges 6a, 7a are set at an angle of 45 degrees, which is the same with respect to the direction in which the bi-folded film f is fed out and the direction in which the article to be packaged G is conveyed. Since the primary conveyance path 1 is inserted into the hollow of the opened bi-fold film f, the packaged article G remains placed in the primary conveyance path 1 and is not restrained in any way. The film is inserted into the half-folded film f without opening. One end of the opened bi-fold film f is welded in advance by the sealing device 3 (from the second time onwards, the front end is always fixed by the welding process for wrapping the article G that was transported just before). The closed portion is caught by the moving article G to be packaged, and the bifold film f is pulled out from the feeding device 4. The bi-folded film f, which is successively opened by the pulled-out film opening guide members 6 and 7, is opened by the blow holes H formed at the entrance edges 6a and 7a.
H, . . . form a slight gap with the film opening guide members 6, 7 and come into a non-contact state, or come into contact with an extremely weak force, and are smoothly opened and pulled out. Also, upper and lower film opening guide members 6 and 7 are provided.
can always maintain a constant tension by the tension maintaining means 30, so when folding the two-fold film f, the film f passes through the apex (tip corner) portion of the film opening guide members 6 and 7. It is possible to effectively prevent entanglement, displacement, etc. This devised bi-fold film opening device is
The present invention is not limited to the above-mentioned embodiments, and any structure may be used as long as it can be mounted vertically with the conveyance means interposed therebetween. Further, it is preferable that the film opening guide member is provided with a blowhole at the entrance edge as described above, since the film can be easily reversed. Further, the film opening guide member may be formed into a triangular plate shape, and in short, it is sufficient that the film opening guide member is separated into upper and lower parts.

[Effect of the idea]

Since this device has the above-mentioned structure, when the half-folded film is reversed by stretching the wire material, the bent edge side of the half-cut film can be guided vertically when folded back. It is possible to invert the film into a substantially U-shaped cross section with a thickness of . This guide allows the film to be turned over smoothly and eliminates extra resistance caused by deformation during reversal. At the same time, the tension of the filament material is maintained at a constant level regardless of the height adjustment of the film opening guide members placed above and below, which prevents the folded film from being rolled in or misaligned. This makes it possible to perform extremely efficient packing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of the folded film opening device of this invention, and Fig. 2 is A--A in Fig. 1.
3 is an explanatory sectional view showing the elevating device and the tension maintaining means, FIG. 4 is a partial perspective view of the packaging device, FIG. FIG. 6 is a plan view showing a different embodiment of the film opening guide member. 1...Primary conveyance path, 2...Secondary conveyance path, 3...
Sealing device, 4... Feeding device, 5... Opening device, 6... Upper film opening guide member, 7...
... Lower film opening guide member, 8 ... Height adjustment device, 30 ... Tension maintaining means, W ... Flexible wire, W' ... Vertical guide portion, f ... Bifold film, A ... Air supply device , G... Goods to be packaged.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A transport path for the packaged article, which is provided as a pair of upper and lower parts whose height can be adjusted so that the article can pass through the gap, and an edge that diagonally crosses the transport path and the edge of the transport path. A film opening guide member having a corner portion with an edge extending in the longitudinal direction and a tip thereof being connected to each other, and a sealing device disposed behind the film opening guide member are provided, and the film opening guide member is provided next to the film opening guide member. A bi-fold film feeding device is provided, the article entrance side of the film opening guide member is opened diagonally in the opposite direction of the bi-fold film feeding device, and the entrance edges of the upper and lower film opening guide members are opened in the film feeding direction. In a device for opening a bi-folded film which is inclined at approximately the same angle with respect to the transport direction of the article, the base end of the filament is not moved up and down in conjunction with the height adjustment of the film opening guide member. At the same time, the wire material is fixed to the corner of one of the film opening guide members, or directly fixed to the corner of one of the film opening guide members. A first guide holder provided at a corner of the other vertically opposing film opening guide member is passed through the first guide holder to form a vertical guide portion, and the first guide holder is provided at an angle forward in the transfer direction of the transfer path from the first guide holder. Instead, pass through the second guide holder provided at the part that moves up and down in conjunction with the height adjustment of the extended film opening guide member, and further in the extending direction of the wire material from the spanning position between the corners. It extends substantially vertically at a certain upward or downward angle, and its extending end is fixed to the other point that does not move up and down in conjunction with the adjustment of the height of the film opening guide member. Folded film opening device. (2) The bi-fold according to claim 1 of the utility model registration claim, characterized in that the filament is made of a wire, and the extending end of the filament is fixed via an elastic member that expands and contracts. Film opening device. (3) The inlet edge of the film opening guide member on the side that contacts the bi-folded film is formed into a hollow tubular shape, and a blowhole is bored on the surface facing the film retraction direction, and a reinforcing plate is fixed at the corner of the inlet edge. The device for opening a bi-folded film according to claim 1, wherein the reinforcing plate is provided with a hole to serve as a guide for passing the filament.