JP2004292005A - Film feeding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film feeding apparatus capable of surely sucking a cut end of a film web on a suction conveyor by a simple constitution. <P>SOLUTION: The film feeding apparatus is provided with a cutting unit 16 for intermittently cutting the film web W to form a film sheet. This cutting unit 16 has an air blowing opening 46 on the underside of a holder 38 on a fixed cutter 18. Air blown from the air blowing opening 46 forms a stream C flowing along a guide passageway 6 for the film web W, and a negative pressure region D for attracting the cut end of the film web W to a suction conveyor 26 side are generated between this stream C and the guide passageway 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film supply apparatus that is applied to an overwrapping machine and supplies a film sheet as a packaging material to a packaging line.
[0002]
[Prior art]
The film supply apparatus of the overwrapping machine guides the film web fed from the web roll along a vertical guide path, and in this process, the film web is intermittently cut to form a film sheet, The film sheet is adsorbed on a suction conveyor and transferred to a packaging line.
[0003]
In this type of film supply apparatus, after the film web is cut, the cut end of the film web is in a free state between the cutting position and the suction conveyor. The area should be as short as possible.
Therefore, when the film web cutting unit comprises a fixed cutter and a rotary cutter cooperating with the fixed cutter, the fixed cutter is disposed immediately above the suction conveyor, thereby shortening the separation area. .
[0004]
However, if the rotational speed of the rotary cutter is also increased as the supply speed of the film sheet is increased, an accompanying air flow is generated along the outer periphery thereof. Such an accompanying flow leads the cut end of the film web in a free state to the rotary cutter side, and the suction conveyor may fail to suck the cut end.
Such a failure in adsorption makes it impossible to stably supply the film sheet, and causes the film sheet to be clogged below the cutting unit.
[0005]
In order to eliminate such problems, a feeding device (Patent Document 1) that cuts the film web by adsorbing the film web to a suction roller with a built-in cutter, or after cutting the film web, the cut end faces the suction conveyor. There is known a supply device (Patent Document 2) in which a rotary cutter is provided with a pressing piece forcibly pressed.
[0006]
[Patent Document 1]
Japanese Patent Publication No. 2-23412 [Patent Document 2]
JP-A-8-216088
[Problems to be solved by the invention]
Since the supply device of Patent Document 1 needs to provide a suction path for the suction roller separately from the suction conveyor, the structure of the suction system is complicated.
On the other hand, in the supply device of Patent Document 2, the film sheet may be damaged by the pressing piece.
[0008]
The present invention has been made based on the above-described circumstances, and an object of the present invention is to provide a film supply apparatus capable of stably supplying a film sheet with a simple configuration and without damaging the film sheet. There is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a film supply apparatus of the present invention (Claim 1) is arranged in a vertical guide path for guiding a film web fed from a web roll, and is disposed in the guide path, and sends out the film web. A feed roller unit and a cutting unit that is arranged in the guide path below the feed roller unit, intermittently cuts the film web, and forms a film sheet of a certain length, on one side of the guide path A cutting unit including a fixed cutter arranged and a rotary cutter arranged rotatably on the other side of the guide path and cutting the film web in cooperation with the fixed cutter; and below the fixed cutter in the cutting unit And a suction conveyor that forms a terminal portion of the guide path and sucks and transfers the film sheet to a predetermined position. The cutting unit is provided on a lower surface of the holder for holding the fixed cutter and the holder, and forms a blowing flow along the guide path by blowing air, and a negative pressure region is formed between the blowing flow and the guide path. And an air outlet for generating air.
[0010]
According to the supply device described above, when the cut end of the film web is sent from the cutting unit toward the suction conveyor, the cut end enters the negative pressure region, and in this negative pressure region, the cut end is transferred to the suction conveyor. Attracted towards. As a result, the cut end is reliably adsorbed to the suction conveyor, and the delivery thereof is taken over by the suction conveyor.
[0011]
Preferably, the supply device may further include a corrugation guide for deforming the film web fed from the feed roller unit into a wave shape when viewed in cross section. This corrugation guide deforms the film web into a wave shape to increase its rigidity, and stabilizes both the feeding of the film web from the feed roller unit to the suction conveyor and the cutting of the film web by the cutting unit.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows the packaging process of the overwrapping machine.
The overwrapping machine has a supply line 2 for articles A and a packaging line 4 extending from the end of the supply line 2, and guides a film sheet S as a packaging material between the supply line 2 and the packaging line 4. A path 6 is defined vertically.
[0013]
The upper end of the guide path 6 is connected to the feed path 8, the film web W is fed from the film roll FR along the feed path 8, and the film web W is guided to the guide path 6.
During the feeding process of the film web W, the film web W is supplied with the opening tape T fed from the tape roll TR, and the opening tape T is adhered to a predetermined position of the film web W.
[0014]
A feed roller unit 10 for the film web W is disposed above the guide path 6. The feed roller unit 10 includes a feed roller 12 and a pinch roller 14, and the feed roller 12 and the pinch roller 14 are arranged with the guide path 6, that is, the film web W interposed therebetween.
A cutting unit 16 is disposed below the feed roller unit 10, and the cutting unit 16 includes a fixed cutter 18 and a rotary cutter 20. The fixed cutter 18 is disposed on one side of the guide path 6, and the rotary cutter 20 is rotatably disposed on the other side of the guide path 6. The fixed cutter 18 and the rotary cutter 20 cut the film web W in cooperation with each other as the rotary cutter 20 rotates.
[0015]
Further, a suction conveyor (not shown in FIG. 1) is arranged below the cutting unit 16, more specifically, its fixed cutter 18, and this suction conveyor constitutes the end of the guide path 6 and is described above. It extends between the supply line 2 and the packaging line 4.
When the film web W is cut by the cutting unit 16, the cut end is adsorbed by the suction conveyor, and the delivery is taken over by the suction conveyor. Next, when the film web W is cut, the film sheet S is formed on the suction conveyor, and the film sheet S is transported to a predetermined supply position while being sucked by the suction conveyor.
[0016]
On the other hand, the packaging line 4 has a folded turret (not shown) at its starting end, and this folded turret receives one article A together with the film sheet S in one pocket. The body is folded around. After this, along with the intermittent rotation of the folding turret, the folding of the trunk flap in the film sheet S, the trunk sealing, and the one-sided ear folding are sequentially performed. Discharged.
[0017]
Thereafter, in the process in which the article A is transported through the packaging line 4, the remaining ear folds of the film sheet S, side flaps formed by the ear folds (side folds), and side seals are sequentially performed. Done. At this time, the article A is completely wrapped by the film sheet S to become a packaged product B.
After that, the packaged product B is inspected, and only the non-defective packaged product B is received from the packaging line 4 to the transport line 22 and transported. On the other hand, defective products are rejected by the reject line 24 branched from the transport line 22. Is done.
[0018]
Referring to FIG. 2, the region of the guide path 6 from the feed roller unit 10 to the suction conveyor 26 through the cutting unit 16 is specifically shown.
As shown in FIG. 2, a corrugation guide 28 is disposed at the top of the guide path 6, and the corrugation guide 28 passes along the guide path 6 from above the feed roller unit 10 through the feed roller unit 10, and , Extending towards the cutting unit 16.
[0019]
More specifically, the corrugation guide 28 includes a pair of rod rows 30 and 32 having a comb-teeth shape, and each of the rod rows 30 and 32 includes a plurality of rods arranged in the width direction of the film web W. The rods of the rod row 30 pass through the circumferential groove of the feed roller 12, and the rods of the rod row 32 pass through the circumferential groove of the pinch roller 14, thereby avoiding interference between the corrugated guide 28 and the feed roller unit 10. It has been. The rods of the rod rows 30 and 32 are alternately arranged in the width direction of the film web W, while the rods of the rod rows 30 and 32 are arranged so that the lower portions thereof enter between adjacent rods as shown in FIG. The surface of the film web W is tapered.
[0020]
Therefore, when the film web W sent from the feed roller unit 10 passes through the lower portion of the corrugation guide 28, the film web W is deformed into a wave shape as seen in the cross section as shown in FIGS. The rigidity of the film web W is increased.
As shown in FIG. 2, the rotary cutter 20 of the cutting unit 16 includes a cylindrical rotary holder 34 and a cutting blade 36 attached to the rotary holder 34 via a plurality of mounting screws 35. 36 cutting edges slightly protrude from the rotary holder 34.
[0021]
On the other hand, the fixed cutter 18 is attached to the fixed holder 38 via a plurality of mounting bolts 40 and is pressed against the guide path 6 side via a plurality of pressing bolts 42. At this time, the cutting edge of the fixed cutter 18 slightly protrudes from the fixed holder 38 and is positioned on the guide path 6.
When the rotary cutter 20 is rotated, the cutting edge of the cutting blade 36 in the rotary cutter 20 is intermittently brought into contact with the cutting edge of the fixed cutter 18, whereby the film web W is cut.
[0022]
Further, some of the mounting bolts 40, for example, the two mounting bolts 40 have no hollow shape having through-holes 44, and these through-holes 44 communicate with air blowing ports 46 opened on the lower surface of the fixed cutter holder 38, respectively. Yes.
Air hoses 48 extend from the through holes 44, and these air hoses 48 are connected to a compressed air source (not shown). Accordingly, when compressed air is supplied to the through-hole 44 through the air hose 48, the compressed air is ejected from the air outlet 46 of the fixed cutter holder 38, and thereby, an air outlet flow C flowing downward along the guide path 6 is generated. Two are formed.
[0023]
More specifically, the suction conveyor 26 disposed below the fixed cutter 18 includes a plurality of suction transfer belts. The suction transfer belts include a pair of side transfer belts 50 and these side transfer belts as shown in FIG. A pair of center transfer belts 52 is provided between the two side flow belts 50 and the center transfer belt 52.
[0024]
The center transfer belt 52 is shorter than the side transfer belt 50, and the article A is pushed into the pocket of the folded turret immediately below the center transfer belt 52. When the blow-off flow C is formed as described above, the blow-off flow C is negatively applied to the separation area between the cutting position of the film web W by the cutting unit 16 and the suction conveyor 16, as shown in FIG. Region D is generated. Here, the negative pressure in the negative pressure region D is equal to or stronger than the negative pressure generated in the lower region of the rotary cutter 20 due to the accompanying flow of air accompanying the rotation of the rotary cutter 20.
[0025]
Therefore, after the film web W is cut, when the cut end passes through the separation area, the cut end is attracted to the suction conveyor 26 side by the negative pressure in the negative pressure region D and is reliably adsorbed to the suction conveyor 26. As a result, the delivery of the film web W from the cutting unit 16 is stabilized, the film sheet S can be reliably supplied onto the suction conveyor 26, and the film web W is not clogged in the cutting unit 16. .
[0026]
Further, since the film web W that has passed through the feed roller unit 10 is deformed in a wave shape and its rigidity is increased, the feeding of the film web W from the feed roller unit 10 to the suction conveyor 26 is stabilized, and the film web W It is reliably cut by the cutting unit 16.
The present invention is not limited to the above-described embodiment, and various modifications can be made.
[0027]
For example, as shown in FIG. 6, an internal passage 54 connected to the air outlet 46 may be formed in the fixed cutter holder 38, and an air hose 48 may be connected to the internal passage 54.
Further, the air outlet 46 may have a slit shape extending in the width direction of the film web W.
[0028]
【The invention's effect】
As described above, according to the film supply apparatus of the present invention (Claim 1), the film web can be formed with a simple configuration by simply providing an air blowing port for blowing air to form a blowing flow on the lower surface of the holder of the fixed cutter. The cut end can be attracted to the suction conveyor side. As a result, even if the rotary cutter is rotating at a high speed, the suction conveyor can reliably adsorb the cut end of the film web, and the film web is sent out, that is, the film sheet is stably supplied.
[0029]
Further, since the film web that has passed through the feed roller unit is deformed into a wave shape by the corrugation guide (claim 2), the film web is sent to the suction conveyor and the cutting thereof is more stably performed.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a packaging process of an overwrapping machine.
2 is a view specifically showing a part of a film supply device in the overwrapping machine of FIG. 1. FIG.
FIG. 3 is a cross-sectional view of a corrugated guide.
FIG. 4 is a perspective view of a corrugated film web.
FIG. 5 is a view showing a suction conveyor.
FIG. 6 is a view showing a film supply apparatus according to a modified example.
[Explanation of symbols]
6 Guide Path 10 Feed Roller Unit 16 Cutting Unit 18 Fixed Cutter 20 Rotary Cutter 26 Suction Conveyor 38 Fixed Holder 46 Air Blowout Port 48 Air Hose C Blowout Flow D Negative Pressure Range

Claims (2)

A vertical guide path for guiding the film web fed from the web roll;
A feed roller unit that is disposed in the guide path and feeds the film web;
A cutting unit that is disposed in the guide path below the feed roller unit and intermittently cuts the film web to form a film sheet having a predetermined length, and is disposed on one side of the guide path. A cutting unit comprising: a fixed cutter, and a rotary cutter that is rotatably arranged on the other side of the guide path and cuts the film web in cooperation with the fixed cutter;
A suction conveyor arranged below the fixed cutter to constitute the terminal end of the guide path, and sucking and transferring the film sheet to a predetermined position;
The cutting unit is
A holder for holding the fixed cutter;
It further comprises an air outlet provided on the lower surface of the holder, which forms an outlet flow along the guide path by blowing out air and generates a negative pressure region between the outlet flow and the guide path. A film supply device. 2. The film supply apparatus according to claim 1, further comprising a corrugation guide for deforming the film web fed from the feed roller unit into a wave shape when viewed in a cross section.

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