JP2001139003A - Film bag manufacturing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag manufacturing mechanism remarkably shortening the length of the bag manufacturing mechanism and also simplifying the structure of the whole of the mechanism. SOLUTION: A film bag manufacturing mechanism is provided with a feed conveyor 1 carrying articles P to a bag manufacturing section for packaging, a raw fabric film roll 2 as a packaging material disposed above the conveyor 1, folding guide disks 3 and 4 disposed under the film roll 2 and folding downward the left and right sides of a film (f) delivered from the roll 2, bag manufacturing guide sections 5 and 6 provided with rollers or with the rollers and belts hung around the rollers for moving the left and right sides of the film (f) close to the central side in the carrying direction while clamping the suspended left and right sides of the film (f) passed through the disks 3 and 4 and carrying them and also center sealers 7 and 8 for joining the left and right sides of the film (f) moved together to the transfer center side by the operation of the guide sections 5 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a tray-type or pillow-type packaging made of a stretch-type plastic film or a general plastic film, which can be performed by a single mechanism. The present invention relates to a bag making mechanism for a film packaging machine capable of shortening the length.

[0002]

2. Description of the Related Art Conventionally, articles such as foods arranged on trays of various shapes are automatically packaged together with a stretch film such as a PE film or a general film, or the packaged articles are formed into a pillow form. Many packaging machines for packaging have been proposed, and many of them have been put to practical use.

[0003] In the above-mentioned packaging machine, the bag making mechanism of the packaging machine using the stretch film has a configuration illustrated in FIG. That is, the stretched film 32 wound in a roll shape on the conveyer 31 is moved in the running direction of the conveyer 31 with respect to the packaged articles F such as foods stacked on the individual trays T conveyed by the conveyer 31. A film feed belt 32 formed by winding a film around a pulley rotatably supported on a horizontal axis on both sides (left and right) of the film in the feed direction.
L and 33R and a film guide (not shown) feed the film 32 in the transport direction of the tray T while holding the entire film in a horizontal position. The film 32 thus fed is immediately after the belts 33L and 33R. By pulling the film into the lower side of the bag-making plate 34 and simultaneously supporting the film with the side belt 35, the left and right sides of the film were brought closer to the lower surface side of the tray T, and were supported by a vertical shaft disposed immediately after the bag-making plate 34. By sandwiching the film 32 between the center sealer rolls 36, the left and right sides of the film 32 are folded into the lower surface of the tray T to form a bag at the center of the lower surface of the tray T with a palm joint.

In the conventional bag making mechanism shown in FIG. 4, a cut plate 37 is provided immediately after the sealer roll 36 for cutting the front and rear portions of the center-sealed film 32 on the tray T. The roller conveyor 38 is arranged, and the front and rear of the cut film 32 are folded under the tray T by the nozzles 39 and 40, so that the tray packaging is completed by the stretch film.

In the above-described conventional bag making mechanism for stretch film, the stretch film 32 as a wrapping material is horizontally spread by film feed belts 33L and 33R, and then conveyed.
The belt 33L, 3
The left and right sides of the film 32 are bent toward the lower surface side of the tray T by the cooperation of the forming bag making plate 34 and the center sealer 36 disposed at the subsequent stage of the 3R, and the bent portion is positioned at the center of the back surface of the tray T. Since the film 32 is overlapped and sealed, the mechanism of the portion where the film 32 is spread horizontally and then folded into the lower surface of the tray T must be long. This point is based on the fact that a general plastic film other than a stretch film is used as a packaging material, and a so-called “bag making device” for forming a film into a cylindrical shape in place of the bag making plate 34 is incorporated in a bag making mechanism. The same applies to bag machines.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional bag making mechanism, the present invention not only significantly reduces the length of the bag making mechanism but also makes the structure of the entire mechanism simple. It is an object to provide a mechanism.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a mechanism of the present invention comprises a supply conveyor for conveying articles to a bag-making section for packaging, and a conveyor arranged above the conveyor. A raw film roll as a wrapping material, a folding guide member disposed below the film roll, and a bending guide member for bending the left and right sides of the film fed from the roll downward, and the film passing through the guide member. A bag-making guide portion comprising a roller or a roller and a belt wrapped around the left and right sides of the film while approaching the center side in the transport direction while nipping and transporting the suspended left and right sides in the orientation of the film; And a center sealer for joining the left and right sides of the film which is brought close to the feed center side by the action of (1). As the bending guide member, a rotatable disk (hereinafter, referred to as a bending guide disk) is preferable.

In the mechanism of the present invention, the supply conveyor is formed by two or more parallel belt conveyors and the left and right conveyors are variably arranged in the left and right positions with respect to the transport direction in the above configuration, so that the articles to be packaged are provided. It is possible to cope with the difference between the left and right widths. This is because the positions of the left and right folding guide discs and the left and right rollers on the film entrance side in the bag-making guide section in the transport direction are made variable, so that a more appropriate one according to the width of the article to be packaged can be obtained. It is possible to realize a bag making mechanism. Further, it is preferable that the bending guide disk has a structure that moves up and down in accordance with the height of an article. In the mechanism of the present invention, instead of the bending guide disk, a bending guide bar formed of a rod having a length about the diameter of the disk, or
In some cases, a folding guide rotating body row in which small balls and small pulleys are arranged in a row so as to be about the length of the guide bar may be used. It is desirable that the upper surface of the guide bar be processed to make it slippery. In addition, the guide bar may be curved so as to have a substantially high middle bow.

[0009]

Next, an embodiment of the mechanism of the present invention will be described with reference to the drawings. 1 is a plan view showing a main part of an example of the bag making mechanism of the present invention, FIG. 2 is a side view of a main part of the bag making mechanism of FIG. 1, and FIG. 3 is a plan view of another example of the bag making mechanism of the present invention. FIG. 4 is a perspective view of an example of a conventional bag making mechanism.

In FIGS. 1 and 2, reference numeral 1 denotes a supply conveyor for supplying articles P such as foods arranged on a tray to a bag making mechanism of the present invention. , Side conveyors 1a and 1b arranged on the right side,
It is formed by three intermediate conveyors 1c arranged between the two conveyors 1a and 1b. In addition, side conveyors 1a, 1b
Is a structure that can change its position on the left and right sides in the transport direction.
To be able to respond to the differences. The position of the intermediate conveyor 1c is fixed.

Of course, the supply conveyor 1 may be formed by a single wide conveyor. Also, in the figure, 1d, 1e, 1f are driven rollers in each of the conveyors 1a to 1c, but these rollers may be in the form of one roller common to each belt. The drive rollers in each of the conveyors 1a to 1c are omitted because they do not appear in the drawing.

Reference numeral 2 denotes an original roll of a plastic stretch film wound up in a roll and disposed as a packaging material near the end of the conveyor 1. The film f, which is rotatably supported by the rollers 2a and 2b and is wound, is supplied to the upper surface of the article P conveyed on the conveyor 1. 2c is the raw film 2
And a stretching roller for stretching the film f fed from the apparatus. In addition, the support form of the film raw material 2 may be a form supporting the paper tube (winding core).

Reference numerals 3 and 4 denote bending guides for bending only the left and right portions of the film f, which is fed onto the article P in the conveying direction of the conveyor 1 via the tension roller 2c, downward. It is a disk as an example of a member.
Reference numerals 3a and 4a denote shafts which rotatably support the disks 3 and 4, and are supported by arm-shaped bearing brackets 3b and 4b which swing about support pins 3c and 4c. With this configuration, the discs 3 and 4 are integrated with the shafts 3a and 4a and the brackets 3b and 4b.
The position can be changed in the transport direction of the article P, that is, the inner widths of both disks 3 and 4 can be changed, and the bearings 3b and 4b are arranged so as to be vertically movable with respect to the transport surface by swinging. I have. In the present invention, although not shown, instead of the bending guide discs 3 and 4, a guide bar having a length about the diameter of the discs 3 and 4 or a small ball or a small ball along the length direction of the bar is provided. A guide rotating body row in which rotating bodies such as pulleys are arranged in a row may be applied.

Reference numerals 5 and 6 denote bag-making guides disposed immediately after the disks 3 and 4 (as viewed from the direction in which the article P is conveyed), and are formed as follows in the illustrated example. First, immediately after the two left and right folding guide disks 3 and 4, two rollers 51a, each of which is a pair, are supported by a vertical axis and located on the left and right sides in the transport direction of the article P. ,Five
1b and 61a and 61b are erected. Left and right rollers 51
Among the rollers 51a and 61a, the rollers 51a and 61a located inside the mechanism are respectively connected to two rollers 52a and 62a arranged closer to the center on the front side with respect to the transport direction, and the belts 5a and 62a, respectively. 6a
Is connected.

On the other hand, the rollers 51b and 61b located on the outside
Two rollers 52b, 62b disposed further forward (in the transport direction) of the rollers 52a, 62a are connected by belts 5b, 6b, respectively. The left belts 5a and 5b and the right belts 6a and 6b in the transport direction are brought into contact with each other in parallel running opposing surfaces, and the belts 5b and 6b are formed by using the rollers 52b and 62b as driving rollers. Is moved in the direction of the arrow, so that the belts abutted against the belts 5b and 6b
The driving belts 5a, 6a are driven by the driving belts 5b, 6b at a constant speed in conjunction with the running of the belts 5b, 6b. Therefore,
Same as 6a, 6b with two parallel left and right belts 5a, 5b
The left and right hanging portions of the film f, both sides of which are bent downward (vertically) by the discs 3 and 4, are clamped between the discs 3 and 4, and are pulled while being attracted to each other in the direction in which the articles are transported.

An end portion of the supply belt 1 of the article P;
A substantially triangular space is formed between the vicinity of the rollers 52a, 62a on the front side of the belts 5a, 6a in the bag-making guide portions 5, 6, and in the present invention, a triangular space is formed in this space. The flat support plate 7 is disposed such that its upper surface is substantially flush with the transport surface of the supply belt 1. Reference numerals 8 and 9 denote a pair of rollers adjacent to the drive rollers 52b and 62b and supported on a vertical axis, and function as a second sealer. The pair of rollers 52b, 62b in the bag-making guide portions 5, 6 and the belt 5b,
6b functions substantially as a first sealer.

In the above example, the support plate 7
Although formed by one triangular plate, in the mechanism of the present invention, as shown in FIG. 3, the support plate 7 is divided into two separate types of plates 71 and 72 from the center thereof.
And the auxiliary plates 73 and 74 are
b, 52b, the belts 5b and 6b wrapped around the same 61b, 62b are arranged in the space formed by the belts.
The auxiliary plates 73 and 74 can be formed so that their positions can be changed in response to changes in the width of the rollers 51a and 51b and the rollers 61a and 61b. With such a configuration, even if the width of the conveyed article P changes, the position of the belts 1a and 1c corresponding to the change of the width, the position of the folding guide disks 3 and 4, and the roller 51a, 51b, 61a, 6
Since the support of the article P can be made more complete following the position change of 1b, trouble in transporting the article in the bag making process is less likely to occur.

As described above, an example of the bag-making mechanism of the present invention is constituted, and its operation and effect will be described below. In the bag making mechanism according to the present invention, the original film 2 wound in a roll shape from above the product P supplied to the bag making mechanism section by the supply conveyor 1 is fed out via the tension roller 2c. The point is the same as that of the conventional mechanism, but the left and right sides of the film f fed out via the pulling rollers 2c are bent downward (vertically) by the bending guide discs 3 and 4, and this folding is performed. The bent portions are pulled into the bottom surface of the article P by the left and right belts 5a, 5b, 6a, 6b abutting on the bag-making guide portions 5, 6 while maintaining the substantially vertical posture, and act as a first sealer. Roller 52b, 62b
The point that it is united on the bottom side of the article P to make a bag
It is completely different from the conventional bag making mechanism. The bag-making guide portions 5, 6 are arranged such that the outer peripheral surfaces of a plurality of rollers are opposed to each other on the traveling locus of the belts 5a to 6b so that the film is conveyed across the opposed surfaces of the rollers. It can also be formed on a roller-type bag-making guide section described above.

[0019]

As described above, the bag-making mechanism according to the present invention has the structure shown in FIG.
Film feed belt in the conventional bag making mechanism illustrated in FIG.
Instead of 33L, 33R, film guide and bag making plate 34,
Since the guide members 3 and 4 formed by disks or the like that bend the left and right sides of the film and the bag-making guide portion using rollers or rollers and belts are provided, the distance between the article supply conveyor and the sealer in the conventional mechanism is greatly increased. It can be formed in packed dimensions and greatly contributes to shortening the length of the entire packaging machine.

In a conventional packaging machine using various films as a packaging material, packaging using a stretch film was practically impossible with a packaging machine including a bag making machine as an essential component. With the bag making mechanism, even without a bag making device, it is possible to make a bag using a film that makes a bag making device indispensable, and because there is no bag making device, it is also possible to make a bag using a stretch film. From bag making with a film that cannot use a bag making machine by one packing machine incorporating the mechanism of the present invention, to bag making with a film that conventionally required a bag making machine, specifically, one package There is an advantage that a machine can perform from tray packaging to pillow packaging.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of an example of a bag making mechanism of the present invention.

FIG. 2 is a side view of a main part of the bag making mechanism of FIG.

FIG. 3 is a plan view of another example of the bag making mechanism of the present invention.

FIG. 4 is a perspective view of an example of a conventional bag making mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Article supply conveyor 2 Raw film 3,4 Folding guide disk 5,6 Bag-making guide part 7 Support plate 8,9 Roller of 2nd sealer T Tray P Article f Film

Claims (5)

[Claims] 1. A supply conveyor for transporting an article to a bag making section for packaging, a raw film roll as a packaging material disposed above the conveyor, and an unrolled film disposed below the film roll and fed from the roll. A bending guide member for bending the left and right sides of the film to be bent downward, and the left and right sides of the film while nipping and transporting the left and right sides of the film passing through the guide member in the orientation of the posture. And a center sealer for joining the left and right sides of the film, which is brought close to the feed center side by the action of the rollers, or a roller for bringing the film closer to the center side in the transport direction, and a belt wound around the rollers. And a film bag making mechanism. 2. The film bag making mechanism according to claim 1, wherein the supply conveyor is formed by two or more parallel belt conveyors, and the left and right conveyors are variably arranged in the right and left positions with respect to the transport direction. 3. A film bag making mechanism according to claim 1, wherein the left and right folding guide members and the positions of the left and right rollers on the film entrance side in the bag making guide section in the transport direction are variably arranged. 4. The film bag making mechanism according to claim 1, wherein the folding guide member is variably arranged in the upper and lower directions in the conveying direction. 5. The bending guide member is formed of either a rotatable disk, a rod-like body on which the film slides on the upper surface, or a row of small rotary bodies arranged in the film feeding direction. The film bag making mechanism according to any one of claims 1 to 4.