JP2000168742A - Packaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding structure for a mandrel wherein unnecessary stress is scarcely applied to a film/sheet while wrinkles, creases, flaws or the like scarcely occur. SOLUTION: An apparatus 10 for putting a cylindrical film/sheet S over an object to be packaged for packaging includes a mandrel 12 for shaping the film/sheet which is fed in a flat state into a cylinder. A first magnet 14 is fixed inside the mandrel 12. A second magnet 16 is placed outside the mandrel 12 across a gap for passing the film/sheet S through from an outer wall face of the mandrel 12. Attractive force and/or repulsive force between the first magnet 14 and the second magnet 16 holds the mandrel 12 on the object H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel holding structure, and more particularly to, for example, a tubular heat shrink.
The present invention relates to a mandrel holding structure used in an apparatus for packaging a film / sheet over a package.

[0002]

2. Description of the Related Art A conventional apparatus for covering a tubular film or sheet over a package H is described in, for example, JP-A-63-29, JP-B-49-35752 and JP-B-6-79.
No. 13332 and the like. Here, an example of a conventional apparatus will be described with reference to FIG. The apparatus 1 includes a mandrel 2 for forming a heat-shrinkable film / sheet S fed in a flat state into a cylindrical shape. The formation from the flat state to the cylindrical state is performed by expanding the cylindrical film / sheet fed out in the flat state so as to cover the substantially cylindrical mandrel 2 and continuously transferring the expanded film / sheet. The mandrel 2 is held by a plurality of sets of rollers 3, 4, and 5. The rollers 3 and 4 are rotatably supported while partially exposing the inside and outside of the mandrel 2. On the other hand, the roller 5 is disposed so as to fit between the rollers 3 and 4, is rotatably supported by the apparatus main body, and is further rotated in a direction indicated by an arrow by a drive motor (not shown). Further, a film / sheet S is provided between the roller 5 and the roller 6 facing the roller 5 in the vertical direction of the mandrel 2.
Of the transfer belt B is suspended. The transport belt and the film / sheet S are held between the rotating roller 5 and the rollers 3 and 4. Therefore, the roller 5 is connected to the rollers 3, 4
In addition to holding the mandrel 2 in cooperation with, the film / sheet S is transported from the upper part of the figure to the lower part to be packaged H while being expanded in a cylindrical shape. Above the mandrel 2, a cutting device 7 for cutting the film / sheet S at a predetermined length is provided. Further, a transport device 9 for transporting the packaged object H is provided below the mandrel 2. Further, a heating device 8 is provided downstream of the transport device 9 for heating and shrinking the film / sheet S covered with the packaged object H by, for example, hot air.

[0003]

However, in the above-described apparatus, a large pressure is applied between the rollers because the pair of rollers 3, 4, and 5 also serves as a mandrel holding means and a film / sheet transfer means. It is easy to catch, and Figure 9
As shown in the figure, the film / sheet S follows a zigzag path when passing between the rollers.
Unnecessary stress is likely to be applied to the sheet S, and wrinkles, kinks, scratches, and the like are likely to be formed.

[0004] Therefore, a main object of the present invention is to prevent unnecessary stress on a film / sheet and to reduce wrinkles, folds, and the like.
An object of the present invention is to provide a mandrel holding structure that is resistant to scratches and the like.

[0005]

A holding structure for a mandrel according to the present invention is a holding structure for a mandrel in a packaging apparatus for packing a tubular film / sheet on a body to be packaged, and is in a flat state. A mandrel for forming the film / sheet fed out in a cylindrical shape,
A first magnet fixed to the inside of the mandrel, and a second magnet fixed to the device body and arranged outside the mandrel, wherein the first magnet and the second magnet The mandrel is held so as not to drop on the packaged object due to the suction force and / or repulsion force of the mandrel. In the mandrel holding structure according to the present invention, in order to easily hold the mandrel by a magnetic force, the first magnet and the second magnet may be displaced vertically in the longitudinal direction of the mandrel. Good.
According to the mandrel holding structure of the packaging device of the present invention, since the mandrel is held by magnetic force, the stress applied to the film / sheet can be reduced by the rollers around the mandrel, and the film / sheet can be used to reduce the rollers around the mandrel. Wrinkles, break habits, scratches, etc. due to passing are less likely to occur.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the accompanying drawings.

[0007]

FIG. 1 is a perspective view showing an essential part of an example of a packaging apparatus using a mandrel holding structure according to the present invention. The packaging device 10 includes a cylindrical mandrel 12 whose one end in the major axis direction is wedge-shaped. As the mandrel 12, for example, a material that is light and hardly magnetized can be used, and for example, an aluminum alloy such as duralumin is preferably used. The mandrel 12 is for forming a heat-shrinkable film / sheet S fed out in a flat state into a cylindrical shape, similarly to the conventional apparatus shown in FIG. Is disposed so as to extend substantially vertically above. Inside the mandrel 12,
The first magnet 14 is fixed. The first magnet 14 is shown in FIG.
As shown in FIG. 2, two fan-shaped ones having a substantially fan shape in plan view are provided apart from each other in the diameter direction of the mandrel 12. At a position facing the first magnet 14 outside the mandrel 12, the mandrel 1
Two substantially arc-shaped second magnets 16 are arranged with a gap for allowing the film / sheet S to pass between the second outer wall surface and the second outer wall surface. The second magnet 16 is fixed to a mounting plate 52 fixed to the main body of the packaging device 10. The mandrel 12 is held on the packaged body H so as to be attracted upward in the long axis direction by the magnetic force of the first magnet 14 and the second magnet 16. Note that the vertical direction in the description of this embodiment coincides with the long axis direction of the mandrel 12.

The first magnet 14 of the packaging device 10
The second magnet 16 and the second magnet 16 are arranged, for example, with polarities as shown in FIG. With this arrangement, the first
The attraction force between the first magnet 14 and the second magnet 16 facilitates a force for pulling the mandrel 12 upward in the longitudinal direction, while the repulsive force between the first magnet 14 and the second magnet 16 lowers the mandrel 12. It becomes easier to resist the force of pushing down. The first magnet 14 and the second magnet 16 are staggered up and down in the longitudinal direction of the mandrel 12, as shown in FIG. 5, to facilitate holding the mandrel by magnetic force. Is also good.

The mandrel 12 is provided with four first transfer rollers 18 rotatable above and below the first magnet 14, for a total of four. The first transfer roller 18 cooperates with a first transfer means 24 to be described later to form a film / sheet S.
Is transported from above to below, and is positioned in the diameter direction of the mandrel 12 in cooperation with a first drive roller 26 described later.

Further, as shown in FIGS. 2 and 4, a second transfer roller 20 is rotatably provided on the mandrel 12. As shown in FIG. 2, the second transfer rollers 20 are arranged at predetermined intervals in the vertical direction in the vicinity of the lower end of the mandrel 12 in the long-axis direction, and the mandrel 12 is moved relative to the first transfer roller 18. About 90 in the circumferential direction
A total of eight, for example, four are provided at positions separated by degrees.
The second transfer roller 20 includes a second transfer unit 32 described later.
The film / sheet S is transported from above to below in cooperation with, and the mandrel 12 is positioned in the diameter direction. The first transfer roller 18
And the second transfer roller 2
The diametric directions positioned by 0 are orthogonal to each other.

Further, a total of eight rollers 22, for example, four in each case, are provided rotatably at predetermined intervals in the vertical direction on both side surfaces of the upper end side of the mandrel 12 which are pointed in a wedge shape. These rollers 22 are for transporting the film / sheet S from above to below in cooperation with a first transport unit 24 described later.

On both sides extending from the upper end to the middle of the mandrel 12, first transfer means 24, 24 are arranged. The first transfer means 24 includes a first drive roller 26. The first drive rollers 26 are rotatably supported by mounting plates 52 fixed to the main body of the packaging device 10 so as to correspond to the four first transfer rollers 18 described above, respectively, and are rotated by a drive motor (not shown). Is done. Also, the first drive roller 26
As shown in FIG. 2, the first transfer belt 30 and the film / sheet S are sandwiched between the first transfer roller 18 and the first transfer roller 18 at an obliquely upper side outside the first transfer roller 18. The first transfer belt 30 is annular, and is disposed so as to extend in the vertical direction beside the mandrel 12. The lower end of the first transfer belt 30 is wound around the first drive roller 26, and the upper end is wound around the roller 28. Can be In this embodiment, gear-shaped irregularities are carved on the respective surfaces of the first drive roller 26 and the roller 28, and the corresponding irregularities are also formed on the first transfer belt 30. Are engaged. An intermediate portion of the first transfer belt 30 between the first drive roller 26 and the roller 28 is provided so that the film / sheet S can be sandwiched between the plurality of rollers 22 provided on the mandrel 12. .

The first transfer means 24 is provided on the upper first
Roller 22 at the upper end with respect to the axis of the drive roller 26
The side is provided so as to be swingable in a direction approaching or moving away from the mandrel 12. That is, in the preparation stage of the packaging operation shown in FIG. 1, the upper end side of the first transfer means 24 is separated from the mandrel 12, and the film / film is attached to the mandrel 12.
The seat S is mounted. When the film / sheet S is mounted on the upper end of the mandrel 12 and the package H is set below, the upper end side of the first transfer means 24 approaches the mandrel 12 from both sides, and the first drive roller 26 and the roller 28, the first transport belt 30 rotating at a high speed and the first
Between the transfer roller 18 and the roller 22
The film / sheet S is continuously transported from above to below while holding the sheet S. Thereafter, when the next film / sheet S is mounted on the upper end of the mandrel 12, the first
The upper end side of the transfer means 24 is separated from the mandrel 12. That is, the upper end side of the first transfer belt 30 is brought close to the rollers 22 on the side surface of the mandrel 12 and holds the film / sheet S only when the film / sheet S is transferred downward.

On both sides of the lower end of the mandrel 12, a second
Transfer means 32, 32 are arranged. Second transfer means 3
2 includes a second drive roller 34. The second drive roller 34 is rotatably supported by a mounting plate 54 fixed to the main body of the packaging device 10 and is rotated by a drive motor (not shown). The second drive roller 34 is provided so as to face the second transfer roller 20 as shown in FIGS. 1 and 4, and the second transfer belt 3 is provided between the second drive roller 34 and the second transfer roller 20.
8 and the film / sheet S. The second transfer belt 38 is annular,
It is arranged so as to extend in the vertical direction on the side of the mandrel 12, and its upper end is wound around the second drive roller 34,
The lower end is wound around the roller 36. In this embodiment, gear-shaped irregularities are carved on the respective surfaces of the second drive roller 34 and the roller 36, and corresponding irregularities are also formed on the second transfer belt 38, and both are formed. Are engaged. The second transfer belt 38 at an intermediate portion between the second drive roller 34 and the roller 36 of the second transfer belt 38 is connected to a plurality of second transfer rollers 20 provided on the mandrel 12 by a film. / Provided so that the sheet S can be sandwiched. The second transfer belt 38 is
The film / sheet S, which is rotated at a high speed by the second roller 34 and the roller 36 and cooperates with the second transfer roller 20, is further continuously transferred further downward. is there.

Further, the packaging device 10 folds a heat-shrinkable film / sheet S for shrink packaging which has been formed in a tubular shape in advance into a flat sheet, winds it into a roll, and holds the mandrel 12. And a film / sheet supply means 40 for sequentially feeding out toward the upper end of the sheet. Further, between the supply means 40 above the mandrel 12,
A cutting device 42 is provided for cutting the film / sheet S that is expanding in a cylindrical shape into a predetermined length. As the cutting device 42, for example, a known cutting blade is disposed with the film / sheet S interposed therebetween, and the film / sheet S is cut by bringing the two cutting blades close to each other at a predetermined timing. A cutting device is used. Mandrel 12
Below, a transport device 46 such as a conveyor belt for transporting the packaged object H is provided. Further, on the downstream side in the transport direction, the film covered by the packaged object H /
For example, a tunnel-shaped heating device 44 for heating and shrinking the sheet S with hot air or the like is provided. Further, in this embodiment, the packaged object holding device 48 is provided on the transport device 46 below the mandrel 12. The holding device 48 converts the sequentially transported packaged objects H into the mandrel 12 in order to easily cover the packaged material H with the film / sheet S transported downward from the mandrel 12.
Is held from both sides in the front-rear direction for a certain period of time in an upright state. As the packaged object H, for example, a container such as a bottle or a can having a cylindrical body or the like can be applied. Further, in this embodiment,
Downstream of the holding device 48, a finishing roller 50 for completing the covering of the package H with the film / sheet S is provided. That is, since the packaged object H is gripped by the holding device 48 when being coated, the gripped portion cannot be covered with the film / sheet S. Then, after the holding by the holding device 48 is released, the film / sheet S is completely pulled down to the bottom of the packaged object H by the finishing roller 50 to complete the coating. As the finishing roller 50, a brush roller having a brush planted on the surface may be used.

At the time of operation of the packaging apparatus 10 of this embodiment, the film / sheet S is sequentially fed out from the supply means 40 in a flat state. The tubular film / sheet S fed out in a flat state is put on the upper end of the mandrel 12, and is continuously and continuously transferred downward.
It is expanded in a tubular shape. Then, the film / sheet S is completely covered on the package H transported by the transport device 46 from above. Thereafter, the film / sheet S is thermally contracted by heating by the heating device 44, and the shrink packaging is completed. Then, the completed package is transported downstream again by the transport device 46, and at the same time, a new packaged object H is transported.

In the above-described structure for holding the mandrel 12 of the packaging apparatus 10, the mandrel 12 does not fall in the vertical direction (height direction) due to the attraction and / or repulsion between the first magnet 14 and the second magnet 16. So that it is kept. At the same time, the first transfer roller 18 and the first drive roller 26
The second transfer roller 20 and the second transfer means 32 position the mandrel 12 in the diameter direction. In this embodiment, the first transfer roller 18 and the first drive roller 26 and the second transfer roller 20 and the second transfer means 32 do not participate in holding the mandrel 12 in the vertical direction. In this packaging device 10, since the mandrel 12 is held by magnetic force, the mandrel 12 is stably held in a state where the mandrel 12 floats in the air except for a portion where the film / sheet S is sandwiched by rollers, and the film / The sheet S can be passed smoothly and at high speed without resistance. Therefore, the roller for holding the mandrel 12 can be eliminated, and the film / sheet S can be transported through a path exhibiting a smooth curve.
Unnecessary stress is less likely to be applied to the sheet S, and wrinkles, creases, scratches, and the like are less likely to be formed. In addition, as shown in FIG.
If the transfer roller 18 and the first drive roller 26 are arranged horizontally and horizontally, the film / sheet S does not bend,
Wrinkles and the like caused by the rollers around the mandrel 12 can be further prevented.

The positions of the first magnet 14 and the second magnet 16 and the arrangement of the magnetic poles are not limited to those described above.
Needless to say, it can be appropriately changed within a range in which the object of the present invention can be achieved.

[0019]

According to the packaging apparatus of the present invention, since the mandrel is held on the package by magnetic force, the stress applied to the film / sheet by the rollers around the mandrel can be reduced, and the film / sheet can be formed. Wrinkles, kinks, scratches, and the like caused by passing through rollers around the mandrel are less likely to occur.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an example of a packaging apparatus using a mandrel holding structure according to the present invention.

FIG. 2 is an illustrative sectional view showing the apparatus shown in FIG. 1 as viewed from the front.

FIG. 3 is a sectional view taken along line III-III shown in FIG. 2;

FIG. 4 is an illustrative sectional view taken along line IV-IV shown in FIG. 3;

FIG. 5 is an illustrative sectional view showing a modification of the arrangement of the first magnet and the second magnet.

FIG. 6 is an illustrative view showing a positional relationship between a first drive roller and a first transfer roller and a state of a first transfer belt and a film / sheet between them;

FIG. 7 is an illustrative view showing a modified example of a positional relationship between a first drive roller and a first transfer roller and a state of a first transfer belt and a film / sheet between them;

FIG. 8 is an illustrative view showing one example of an apparatus using a conventional mandrel holding structure.

FIG. 9 is an illustrative view showing a positional relationship of a pair of rollers for holding the mandrel and transporting the film / sheet in the apparatus shown in FIG. 8 and a state of a transport belt and a film / sheet between them;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging apparatus 12 Mandrel 14 1st magnet 16 2nd magnet 18 1st transfer roller 20 2nd transfer roller 22 roller 24 1st transfer means 26 1st drive roller 28 roller 30 1st transfer belt 32 Second transfer means 34 Second drive roller 36 Roller 38 Second transfer belt 40 Film / sheet supply means 42 Cutting device 44 Heating device 46 Transport device 48 Holding device 50 Finishing roller

[Procedure amendment]

[Submission date] October 22, 1999 (1999.10.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Packaging device

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging apparatus , and more particularly to an apparatus for packaging a tubular heat-shrinkable film / sheet over a package .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004] Therefore, a main object of the present invention is to prevent unnecessary stress on a film / sheet and to reduce wrinkles, folds, and the like.
An object of the present invention is to provide a packaging device that is resistant to scratches and the like.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

SUMMARY OF THE INVENTION A packaging apparatus according to the present invention.
Is a packaging equipment for packaging is covered with a tube-like film / sheet to be packaged body, for forming a coming fed in a flattened state film / sheet into tubular and the mandrel, the mandrel a first magnet fixed inside, is fixed to the apparatus main body, viewing including a second magnet disposed outside of the mandrel, the mandrel first magnet and the second
To be packaged by the attraction and / or repulsion of the magnet
Above and further diametrically opposed to the mandrel.
A first transfer roller rotatably provided on both wall surfaces;
Operate film / sheet in cooperation with first transport roller
It is installed in the main body of the device to transfer from the upper end to the lower end of the barrel.
First driving means for driving the first mandrel and a first transfer mechanism for the mandrel.
Are diametrically opposed to each other
A second transfer roller rotatably provided on both wall surfaces;
2 cooperates with the transfer rollers of
Installed on the main unit to transfer from the upper end to the lower end
And a second driving means . Further, in the packaging apparatus according to the present invention, the first transfer row is provided.
And the first drive means, and the second transfer roller and the first drive means.
2 driving means is involved in holding the mandrel up and down
Work together to achieve diametrical positioning of the mandrel.
Preferably.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

FIG. 1 is a perspective view showing an essential part of an example of a packaging apparatus using a mandrel holding structure according to the present invention. The packaging device 10 includes a cylindrical mandrel 12 whose one end in the major axis direction is wedge-shaped. As the mandrel 12, for example, a material that is light and hardly magnetized can be used, and for example, an aluminum alloy such as duralumin is preferably used. Mandrel 12
8 is for forming a heat-shrinkable film / sheet S fed out in a flat state into a cylindrical shape, as in the case of the conventional apparatus shown in FIG. It is arranged to extend to. Inside the mandrel 12,
The first magnet 14 is fixed. The first magnet 14 is shown in FIG.
As shown in FIG. 2, two fan-shaped ones having a substantially fan shape in plan view are provided apart from each other in the diameter direction of the mandrel 12. At a position facing the first magnet 14 outside the mandrel 12, the mandrel 1
Two substantially arc-shaped second magnets 16 are arranged with a gap for allowing the film / sheet S to pass between the second outer wall surface and the second outer wall surface. The second magnet 16 is fixed to a mounting plate 52 fixed to the main body of the packaging device 10. The mandrel 12 is held on the packaged body H so as to be attracted upward in the long axis direction by the magnetic force of the first magnet 14 and the second magnet 16. Note that the vertical direction in the description of this embodiment coincides with the long axis direction of the mandrel 12.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

According to the packaging device to the present invention, it is possible to reduce the stress applied from the roller near Ma down <br/> Dorell the film / sheet, film / sheet passes through the rollers around the mandrel Wrinkles, breakage habits, scratches, etc., due to the wrinkles are less likely to occur.

Claims (2)

[Claims] 1. A structure for holding a mandrel in a packaging device for packaging a tubular film / sheet over a packaged object, wherein the film / sheet fed out in a flat state is formed into a tubular shape. A first magnet fixed to the inside of the mandrel, and a second magnet fixed to the apparatus main body and arranged outside the mandrel, the first magnet comprising: A mandrel holding structure for holding the mandrel on the packaged object by an attractive force and / or a repulsive force between the mandrel and the second magnet. 2. The mandrel holding structure according to claim 1, wherein the first magnet and the second magnet are arranged so as to be shifted vertically in the longitudinal direction of the mandrel.