JP4369680B2 - Packaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging apparatus in which a packaging sheet is packaged in close contact with a workpiece when a workpiece such as various commodities is packaged by body folding or body winding.
[0002]
[Prior art]
In general, as this type of body-wrapping device, for example, there are devices described in Patent Documents 1 and 2 below.
For example, in Patent Document 1, in a state where a packaging film of a predetermined size is held by a belt pulley, the work is lifted by an elevator and pressed against the film to cover it in a body winding or a body folded state. And both sides | surfaces of a workpiece | work are hold | maintained with a paddle via a film, and are further packaged after that. In addition, when a press plate is disposed between the paddles and the cylinder-folded work is lifted by an elevator and sandwiched between the pair of paddles, the air caught between the upper surface of the work and the film is They are sandwiched between elevators and forcibly compressed so that they are discharged and rolled up.
Moreover, in patent document 2, when raising a workpiece | work with an elevator and pressing against a film and carrying out a body folding like the packaging apparatus of patent document 1, it is a guide plate on the both sides | surfaces which oppose from the raising start by an elevator to the completion | finish of raising. The body width is regulated by the guide plate. In addition, the film is pulled in a direction opposite to the moving direction of the workpiece by a suction hole provided in the middle of the guide plate, and the body is folded while being in close contact with the upper surface and both side surfaces of the workpiece.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-12302 [Patent Document 2]
Japanese Patent Laid-Open No. 6-32307
[Problems to be solved by the invention]
However, in the packaging devices described in Patent Documents 1 and 2, air is left in the space between the work and the film before the film is pressed against the work because the film is pressed tightly by pressing it against the work with a press plate or a guide plate. Is wrapped together with the work during the body winding and collected between the upper surface of the work. For this reason, there is a drawback that the body becomes loose and cannot be tightly wrapped.
When raising the workpiece at low speed, it is possible to remove the air accumulated between the workpiece upper surface and the film by compressing it with a press plate or guide plate. Even if the body is folded, air cannot escape from both sides without the film, and the film swells like a balloon. Therefore, wrinkles and sagging occur in the packaged film. For this reason, there is a drawback that the appearance is poor.
In addition, when a soft unstretched plastic film such as a polyethylene film is used as the film, the film on the upper surface of the work swells in a balloon state, so that the film undulates and vibrates when the work is raised at a high speed.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging apparatus that can perform tight packaging without causing wrinkles or sagging even during high-speed packaging for conveying a workpiece at high speed. And
[0006]
[Means for Solving the Problems]
The packaging device according to the present invention is a packaging device in which a workpiece is pressed against a packaging sheet for packaging, a holding means for holding the packaging sheet, a conveying means for conveying the workpiece in the direction of the packaging sheet, and the workpiece And a guide member that guides the conveying direction, and an exhaust hole that is formed in the guide member and exhausts air between the workpiece and the packaging sheet.
When the workpiece is conveyed along the guide member and pressed against the packaging sheet, the workpiece is conveyed to the packaging sheet by causing the air in the gap between the workpiece and the packaging sheet to be exhausted from the exhaust hole and conveyed. The air between the workpiece and the wrapping sheet can be eliminated when the body folds and is wrapped so that tight packaging without wrinkles or sagging can be performed.
[0007]
Moreover, the exhaust means which forcibly exhausts the air between a workpiece | work and the packaging sheet from an exhaust hole may be provided. As a result, evacuation can be performed more smoothly, and packaging such as cylinder folding or cylinder winding in which the film is in close contact with the workpiece can be performed.
The exhaust unit is preferably a suction unit that forcibly sucks and exhausts air from the exhaust hole. Or the blowing means which pushes a packaging sheet to a workpiece | work direction and discharges air from an exhaust hole via a packaging sheet may be sufficient.
Further, the packaging sheet held by the holding means may be bent toward the work when contacting the work by forcibly exhausting air from the exhaust hole by the exhaust means . Thereby, the discharge of air between the packaging sheet and the workpiece can be promoted, and the air wrapping can be further reduced, and the tight packaging can be performed.
It should be noted that a switching valve may be provided in the exhaust means to turn on and off the exhaust.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a packaging device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view for explaining the outline of a process of collecting and packaging boxes for each integration unit in an integrated packaging machine including a packaging apparatus, FIG. 2 is a main part configuration diagram of the packaging apparatus, and FIG. 3 is a packaging shown in FIG. FIG. 4 is a schematic view of the suction device shown in FIG. 3 as viewed from 90 ° different directions.
The integrated packaging machine 1 shown in FIG. 1 is a unit unit in which a rectangular parallelepiped box (hereinafter simply referred to as a box) b such as a tissue box, for example, is arranged in close contact with an appropriate number of pieces, for example, 5 pieces. The integrated unit B is a device for packaging with a packaging sheet such as a plastic film f. In the present embodiment, a soft unstretched plastic film made of, for example, a polyethylene film is used as the film f.
[0009]
In the packaging process by the integrated packaging machine 1, the boxes b manufactured in sequence are arranged in the same direction in close contact with each other and conveyed by the integrated conveying device 2, and then the adjacent boxes b are separated from each other in the conveying process. After that, the integrated unit B is formed by bringing them into close contact with each other. Then, the integrated unit B is sent upward by an elevator. On the other hand, in the packaging machine 3, a strip-shaped plastic film fo made of polyethylene or the like is wound around a roll 4, and the film fo is unwound from the roll 4 and cut at a predetermined length by a film cutting device 5.
And in the packaging machine 3, in the state which hold | maintained the cut | disconnected film f horizontally, the integrated unit B which raises with an elevator is pressed from the bottom, it folds down, and it wraps in a body winding with the film f, Then, the side flap of both ends is carried out. Further, it is bent and sealed.
[0010]
In the stacking and packaging machine 1 having the outline process of stacking the boxes b and packaging with the film f, for example, the packaging of the packaging machine 3 that winds and winds the stacking unit B with the film f cut into a substantially square shape having a width of about 780 mm. The apparatus 6 will be described below.
The packaging machine 3 shown in FIG. 1 is disposed on the extension line of the flat belt conveyor of the stacking and conveying apparatus 2 that conveys the box b so as to be substantially opposed to each other while being vertically shifted. The packaging device 6 is arranged in a direction substantially orthogonal to the conveyance path of the box b, and is wrapped around with the film f while conveying the integrated unit B. Moreover, the packaging device 6 is disposed so as to be deviated in the vertical direction with respect to the conveyance path of the box b, and the unit B on the conveyance path is lifted by an elevator so as to be wrapped in the body with the film f.
In the packaging device 6 shown in FIGS. 2 and 3, the film f cut into a substantially square shape is conveyed to a position of an elevator 9 for raising the integrated unit B by a pair of belt pulleys 8 and 8 (holding means), and is in a stationary state. Retained. On the upper side of the film f that is held stationary, a paddle mechanism 10 that holds the integrated unit B in which the film f is folded is disposed in a stationary state. A plurality of paddle mechanisms 10 are arranged at predetermined intervals and supported by an endless chain 11. This endless chain 11 is wound between a pair of chain wheels (not shown) and is intermittently conveyed by a drive source such as a motor to intermittently convey the paddle mechanism 10.
In the intermittent conveyance, the pair of upper paddles 13 and 13 of the adjacent paddle mechanism 10 is moved from the receiving position of the stacking unit B by the pair of upper paddles 13 and 13 of the single paddle mechanism 10 to the receiving position of the stacking unit B. The distance until this is set as one pitch.
[0011]
In each paddle mechanism 10, as shown in FIG. 2, a pair of upper paddles 13, 13 are arranged facing each other so as to sandwich the integrated unit B. Each of the upper paddles 13 has a substantially L shape in side view, and forms a substantially plate shape extending in the arrangement direction of the five boxes b in the integrated unit B (direction perpendicular to the paper surface in FIG. 2). Each upper paddle 13 is supported in a state where a substantially L-shaped head 13a extends in the horizontal direction and is fixed to the chain 11, and a leg 13b substantially perpendicular to the head 13a extends downward.
Moreover, a substantially plate-shaped paddle portion 14 for holding the side surfaces B1 and B2 in which the five boxes b of the integrated unit B are arranged is attached to the inner side surface of the leg portion 13b. A flank that is inclined or curved outward is formed at the lower end of the paddle portion 14. In the pair of upper paddles 13 and 13 of the paddle mechanism 10, the interval W between the paddle parts 14 and 14 is set to be substantially equal to the width of the long side of each box b of the integrated unit B.
Thus, the side surfaces B1 and B2 are sandwiched between the pair of upper paddles 13 and 13 in a state where the integrated unit B raised by the elevator 9 pushes the film f and is folded.
[0012]
A stopper 15 is provided below the film f held by the belt pulleys 8 and 8 to stop the stacking unit B transported by the stacking transport device 2 at a position where it is placed on the stationary elevator 9. (See FIG. 4).
A pair of side guides 16 and 16 (guide members) are disposed on both sides of the stopper 15 so as to face each other. The side guides 16, 16 guide the ascent of the integrated unit B by the elevator 9, and are each formed in a substantially plate shape. The side guides 16, 16 are held by the belt pulleys 8, 8 from the upper side of the elevator 9 and come into contact with the film f. It extends upward to the position.
The side guides 16 and 16 are set at the same interval W as the interval between the paddle portions 14 and 14. For this reason, the side guides 16 and 16 abut on the side surfaces B1 and B2 on which the boxes b of the integrated unit B stopped by abutting against the stopper 15 are arranged.
[0013]
Further, each side guide 16 is formed with one or a plurality of long hole-shaped exhaust holes 17 in the upper part thereof. In FIG. 4, three rows of upper and lower two-stage exhaust holes 17 extending in the horizontal direction are provided in the space C between the upper surface B3 of the integrated unit B placed on the elevator 9 in contact with the stopper 15 and the film f. ing. It should be noted that the space C between the upper surface B3 of the integrated unit B and the film f only needs to have a gap that allows the air in the space C to be exhausted to the outside through the exhaust hole 17.
2 and 3, a suction chamber 18 is provided outside the exhaust hole 17 of each side guide 16, and the suction chamber 18 communicates with a suction blower 20 through a pipe 19. The pipe 19 is provided with a switching valve 21 for switching between opening and closing. By switching the switching valve 21, it is possible to control intake and stopping through the exhaust hole 17 of the side guide 16. The suction chamber 18, the pipe 19, the suction blower 20, and the switching valve 21 constitute a suction means 30 (exhaust means).
[0014]
A pair of auxiliary guides 23, 23 that allow the elevator 9 to pass through the integrated unit B are disposed above the side guides 16, 16 via the film f held by the belt pulleys 8, 8. .
Here, as shown in FIG. 2, each pair of paddle portions 14, 14, side guides 16, 16 and auxiliary guides 23, 23 are arranged in the same straight line, have the same interval W, and have the same center line O. The center line O coincides with the lifting axis of the elevator 9.
A pair of bottom tackers 24 and 24 that can reciprocate in the horizontal direction are provided below the paddle mechanism 10. The bottom tackers 24, 24 move in a direction approaching the center line O while sucking air, thereby covering the lower surface B4 of the cylinder-folded integrated unit B held by the paddle mechanism 10 with the film f. ing. Further, each paddle portion 14 of the paddle mechanism 10 is provided with a press portion 25 for elastically pressing the both end corners of the upper surface B3 of the sandwiched integrated unit B.
[0015]
The packaging device 6 according to the present embodiment has the above-described configuration, and the operation will be described next. The packaging device 6 is configured to carry the integrated unit B at high speed and wrap it at high speed.
First, in FIGS. 2 and 3, the film f cut to a predetermined size is sandwiched at both ends by a pair of belt pulleys 8, 8, conveyed to the receiving unit B receiving position below the paddle mechanism 10, and held stationary. . On the other hand, the stacking unit B is transported by the stacking and transporting apparatus 2 in units of five, and is placed on the elevator 9 at a position where it abuts against the stopper 15 below the film f that is held stationary as shown in FIG. The When the integrated unit B collides with the stopper 15, a part of the air in the box b is sent between the upper surface B3 and the film f.
In general, since the box b constituting the stacking unit B is a paper box, it is in a state of expanding into a barrel shape including air inside. Therefore, the integrated unit B is collided with the stopper 15 between the side guides 16 and 16 to discharge air from the inside of the box b so as to be shaped into a shape close to a rectangular parallelepiped. And since the pair of side guides 16 and 16 contact | abuts the integration | stacking unit B to side surface B1, B2, three side surfaces are controlled in combination with the stopper 15. FIG. Further, the center of the film f is slightly shifted from the front of the paddle mechanism 10 in the transport direction with respect to the center line O of the paddle mechanism 10 (see FIG. 2).
Next, by opening the switching valve 21, the suction force of the suction blower 20 is applied to the exhaust holes 17, 17 of the side guides 16, 16 through the pipe 19 and the suction chamber 18, and the upper surface B 3 of the integrated unit B and the film The air in the gap C with f is exhausted. As a result, the gap C has a negative pressure, so the soft film f is curved between the side guides 16 and 16 toward the upper surface B3 (see FIG. 3). Thereafter, the elevator 9 is raised and the integrated unit B is conveyed along the side guides 16 and 16. Then, since the air in the gap C is exhausted, the film f is pressed against the upper surface B3 of the integrated unit B and does not swell in a balloon shape, and smoothly adheres.
[0016]
The integrated unit B rising by the elevator 9 pushes the film f from below and folds it to remove the film f from the belt pulleys 8 and 8. The stacking unit B that folds the film f passes between the pair of auxiliary guides 23, 23, so that the film f is folded into a substantially U shape between the auxiliary guides 23, 23 and both side surfaces B 1, B 2 of the stacking unit B. Squeeze both sides of the lever and pull it downward by friction. Thus, the film f is brought into close contact with the upper surface B3 and the both side surfaces B1 and B2 of the integrated knit B.
The ascending stacking unit B is inserted between the pair of upper paddles 13 and 13 through the pair of bottom tackers 24 and 24. Since the flank is formed at the lower ends of the paddle portions 14 and 14 of the upper paddles 13 and 13, the integrated unit B is smoothly inserted between the paddle portions 14 and 14.
Then, as shown in FIG. 2, the integrated unit B stops at a position where both corners of the upper surface B3 abut against the press portions 25, 25 via the film f and slightly elastically deforms, and the upper paddle 13, 13 paddle portions 14 and 14 are sandwiched. Since the press portions 25 and 25 elastically press the vicinity of both corners of the upper surface B1 through the film f, the displacement and loosening of the film f in the vicinity of the corner portions of the upper surface B1 are prevented.
In this state, the bottom surface B <b> 4 of the integrated unit B is positioned on a substantially extended line of the top surfaces of the bottom tackers 24 and 24. Moreover, in FIG. 2, both end portions of the film f in the body folded state are bent outward through the auxiliary guides 23, 23, but the left end portion extends longer than the right end portion.
[0017]
Next, the pair of bottom tackers 24 and 24 move in the direction of approaching each other toward the center line O while performing intake air, thereby pushing the film f extending in the vertical direction and moving horizontally on the bottom surface B2. Since the elevator 9 is lowered in conjunction with this, the integrated unit B sandwiched between the pair of upper paddles 13 and 13 is supported by the bottom tackers 24 and 24. Furthermore, each bottom tacker 24 slides in the direction of the center line O along the bottom surface B4 while taking in air, whereby the film f is gradually wrapped in a body-wound state so as to cover the bottom surface B4 from both sides. Moreover, a force acts in the direction in which the film f is softly pulled at both ends by the intake air, so that the film f is prevented from being stretched or displaced, and the film f is tightly wound around the integrated unit B.
In this state, the right end portion of the film f is in close contact with the bottom surface B4, and the left end portion is not in close contact with the bottom surface B. Then, in order to convey the integrated unit B by moving the paddle mechanism 10 by intermittent movement, the left end portion of the film f is overlapped with the right end portion in close contact with the bottom surface B4, and the body winding is finished.
[0018]
As described above, according to the present embodiment, the air generated when the integrated unit B collides with the stopper 15 at the time of trunk winding and the air remaining between the upper surface B3 and the film f are forcibly exhausted through the exhaust hole 17. Thus, even if the integrated unit B is conveyed at a high speed, the film f can be smoothly adhered to the upper surface of the integrated unit B, and tight roll-wrapping with a good appearance can be performed without causing wrinkles, stretching or sagging.
[0019]
In the above-described embodiment, when the stacking unit B is lifted, the air in the gap C is sucked by the suction means 30 and the film f is curved and brought closer to the upper surface B3 side of the stacking unit B with a negative pressure, and then the elevator is moved. 9, the integrated unit B is raised and pressed against the film f. However, the present invention is not limited to such a procedure, and the suction unit is not limited to such a procedure. 30 may be activated. Even in this case, the film f can be evacuated by preventing the film f from expanding in a balloon shape with the air in the gap C by raising the integrated unit B, so that tight packaging without wrinkles or stretched sag can be performed on the film f.
In the above-described embodiment, air accumulated in the gap C between the upper surface B3 of the integrated unit B and the film f is forcibly exhausted using the suction means 30 including the suction blower 20. Is not limited to such a configuration, and the suction means 30 may not be provided. In this case, the air accumulated in the gap C is compressed with the film f by the ascending of the integrated unit B by the elevator 9, so that it is pushed out from the exhaust hole 17 and exhausted.
If such a configuration is adopted, the configuration becomes simple and the inexpensive packaging device 6 can be obtained.
[0020]
Further, in the above-described embodiment, the suction means 30 is adopted as the exhaust means, and the air in the gap C is forcibly sucked and exhausted. Instead, as in the modification shown in FIG. Air blowing means 32 may be provided on the side opposite to the elevator 9 and the integrated unit B with respect to the film f supported by the belt pulleys 8 and 8. By forcibly curving the film f in the direction of the integrated unit B with the air discharged from the blowing means 32, the air in the gap C can be exhausted from the exhaust hole 17 to the outside. In addition, by curving the film f, it is possible to suppress a wrapping of air in the gap C when the integrated unit B is raised, and to perform a tighter body fold.
Moreover, the shape of the exhaust hole 17 formed in the side guide 16 is not limited to the long hole, and is arbitrary, and even if the long hole 17 is adopted, the shape is not limited to the horizontal direction, and may be arbitrary such as an oblique direction or a vertical direction. It can be formed in the direction of In addition, regarding the pair of side guides 16, 16, a configuration in which the exhaust hole 17 or the exhaust hole 17 and the suction unit 30 are provided in only one of them may be adopted. Further, the exhaust hole 17 may be provided in a member different from the side guide 16.
Further, as the film f, instead of the above-mentioned unstretched plastic film, a work-cured film such as paper or OPP or CPP may be used, and these films and paper constitute a packaging sheet.
Further, the work to be stacked and transported in the present invention is not limited to the stacking unit B of the box b, and can be applied to various products. Moreover, it is not limited to the thing which accumulated several workpiece | work, The same packaging can be performed also with a single-piece workpiece | work.
[0021]
【The invention's effect】
As described above, the packaging device according to the present invention includes a guide member that guides the workpiece conveyance direction, a conveyance unit that conveys the workpiece in the direction of the packaging sheet, and a guide member that is formed between the workpiece and the packaging sheet. Since air is exhausted between the workpiece and the sheet for packaging, the air in the gap between the workpiece and the packaging sheet can be exhausted from the exhaust hole, and tight packaging without wrinkles, stretching or sagging can be performed.
[0022]
In addition, since the exhaust means for forcibly exhausting the air between the workpiece and the packaging sheet is provided, it is possible to perform the packaging in which the film is closely attached to the workpiece by exhausting more smoothly and suppressing the wrapping of the air.
In addition, the packaging sheet held by the holding means is forced to exhaust air from the exhaust hole by the exhaust means so that it is curved toward the workpiece side when contacting the workpiece. Air discharge between the sheet and the workpiece can be promoted, and air wrapping can be further reduced, and tight packaging can be performed.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining an outline of a process of stacking and packaging boxes for each stacking unit in a stacking and packaging machine including a packaging apparatus according to an embodiment of the present invention.
FIG. 2 is a main part configuration diagram of the packaging device.
FIG. 3 is a schematic view showing portions of a side guide and suction means of the packaging device.
4 is a schematic view of the packaging device shown in FIG. 3 as viewed from a direction different by 90 °. FIG.
FIG. 5 is a view similar to FIG. 3 showing a modification of the packaging device according to the present embodiment.
[Explanation of symbols]
2 Stacking and transporting device 6 Packaging device 8 Belt pulley (holding means)
9 Elevator (transportation means)
10 Paddle mechanism 15 Stopper 16 Side guide (guide member)
17 Exhaust hole 30 Suction means (exhaust means)
32 Blowout means (exhaust means)
b Box (work)
B Integrated unit (work)
f Film (packaging sheet)

Claims (3)

In a packaging device that wraps a workpiece against the packaging sheet,
A holding means for holding the packaging sheet; a conveying means for conveying the workpiece in the direction of the packaging sheet; a guide member for guiding the conveying direction of the workpiece; and the workpiece and the packaging sheet formed on the guide member A packaging apparatus comprising an exhaust hole for exhausting air between the two.   The packaging apparatus according to claim 1, wherein exhaust means for forcibly exhausting air between the workpiece and the packaging sheet from the exhaust hole is provided. The packaging sheet held by the holding means is bent toward the work when contacting the work by forcibly exhausting air from the exhaust hole by the exhaust means. The packaging device according to claim 2 .

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