JPH1191709A - Packaging equipment having clamper for pinching packaging film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide packaging equipment which can grasp the end of a film firmly and hold it even when the same is used in a damp environment. SOLUTION: This packaging equipment 1 is provided with a film pinching part 61 for pinching and keeping the end F1 of a vinyl packaging film F. The film pinching part has a fixed clamper 44 and a movable clamper 58, and the movable clamper is able to open/close extending from a closing position where the same, together with the fixed clamper, holds the end of the film to an opening position where the same releases the end of the film. The touching face 50 with the film of the fixed clamper is made of the same type material as the film, and the touching face 59 with the film of the movable clamper is made of a metallic material which is smooth and yet shiny.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for packaging a tray containing articles to be packaged, such as food, using a packaging film, and in particular, holds an end of the film during the packaging operation. The structure of the clamper.

[0002]

2. Description of the Related Art Conventionally, there has been known an apparatus for automatically wrapping a tray containing an article to be wrapped such as fresh food using a wrapping film made of vinyl chloride. This type of packaging apparatus includes a tray packaging section to which a tray containing articles to be packaged is supplied, a film supply section to guide a packaging film to the tray packaging section, and a packaged tray sent out from the tray packaging section. And a tray carrying-out section for receiving the same.

According to this conventional packaging apparatus, the film fed from the film supply section is pulled in the tray feeding section in the film feeding direction and in the width direction orthogonal to the feeding direction, and is stretched by this. The tray that stores the object to be stored on the film is applied from below. Then, in this state, by folding the film from both sides along the payout direction and both sides along the width direction toward the bottom of the tray,
The tray and the article to be packaged are integrally packaged.

When the film is pulled back and folded, the above-mentioned conventional packaging apparatus includes a front gripper for grasping the leading end of the film fed from the film supply unit and pulling out the front end, and both ends in the width direction of the film pulled out. And a pair of side grippers for grasping and pulling.

[0005] The front gripper includes a fixed clamper and a movable clamper disposed below the fixed clamper. These clampers have contact surfaces facing each other, and sandwich the leading end of the film between these contact surfaces.

[0006] A flat film pad is attached to the contact surface of the fixed clamper. The film pad is made of an elastic material such as polyurethane sponge rubber, and comes into contact with the film with a predetermined frictional force.

The movable clamper can be opened and closed between a closed position where the end of the film is sandwiched in cooperation with the fixed clamper and an open position where the movable clamper is released below the fixed clamper and releases the sandwiching of the film. ing. The movable clamper is formed of a comb-shaped thin metal plate, and a contact surface of the movable clamper is subjected to chrome plating. Therefore, the contact surface of the movable clamper is a flat mirror surface which is smooth and glossy, and good adhesion to the film is maintained.

Therefore, the leading end of the film is sandwiched between the film pad of the fixed clamper and the contact surface of the movable clamper, thereby preventing the film from coming out of the front gripper.

[0009]

By the way, this type of packaging apparatus is used under various environments, and may be used in a place with high humidity such as a kitchen. Then, in the conventional packaging apparatus, when the front gripper grasps the leading end of the film and pulls it out, or when the film pulled out by the front gripper is pulled in the width direction by the side gripper, the leading end of the film comes out of the front gripper. This causes a problem that the film cannot be stretched to a size corresponding to the tray.

The reason for this is that when the film or gripper is condensed due to use in an environment with high humidity or a change in the ambient temperature of the packaging device, moisture penetrates into the film pad of the fixed clamper, and It is considered that water is interposed between the film pad and the film or between the movable clamper and the film as a water film, and the coefficient of friction at the contact portion with the film rapidly decreases.

Therefore, if slippage occurs between the film and the front gripper due to a decrease in the coefficient of friction, when the film is folded toward the bottom of the tray, the margin of overlap between the film and the bottom surface of the tray is insufficient, and the tray is insufficient. Cannot be completely packaged. As a result, packaging failures such as partial exposure of the bottom of the tray may occur, which may cause a reduction in the value of the product, or juice or moisture released from the packaged product may flow from the unpacked portion at the bottom of the tray. The problem of oozing out and soiling other products and hands arises.

An object of the present invention is to enable the film edge to be firmly gripped and held even when used in an environment with a particularly high humidity, and to prevent the film from coming out at the time of tray packaging. It is to obtain a packaging device.

[0013]

In order to achieve the above object, the invention according to claim 1 is characterized in that, when a tray accommodating an object to be packaged is packaged by using a packaging film, an edge of the film is used. It is assumed that the packaging device has a film holding portion for holding the portion therebetween, and the film holding portion grasps the end of the film and pulls out the film to a position covering the tray.

The film holding portion has a first clamper and a second clamper facing each other, and the second clamper cooperates with the first clamper to sandwich an end of the film. Openable and closable over a closed position and an open position detached from the end of the film,
The contact surface of the first clamper with the film is made of the same material as the film, and the contact surface of the second clamper with the film is made of a smooth and glossy metal material. It is characterized by being constituted.

According to such a packaging apparatus, the adhesion between the film and the first clamper and between the film and the second clamper are both improved, and even when used in an environment with high humidity, slippage may occur. The effect of moisture can be eliminated as much as possible. For this reason, the holding force of the film is improved, and the film can be reliably prevented from coming out of the film holding portion when the film is pulled.

Further, since the contact surface of the second clamper is smooth and the frictional resistance between the second clamper and the film is kept small, the peeling property of the film when the second clamper is moved to the open position is also improved. The film becomes good, and the film is hardly entangled or adhered to the film holding portion.

In order to achieve the above object, according to the present invention, when a tray accommodating an object to be packaged is packed by using a film for packaging, the tray is held by sandwiching an end of the film. It is assumed that the packaging device has a film holding portion, and the film holding portion is used to hold the film and pull out the film to a position covering the tray. And
The film clamping portion has a first clamper and a second clamper facing each other, and the second clamper cooperates with the first clamper to close the end of the film and the film. The contact surface of the first clamper with the film is formed of tanned leather, and the contact surface with the film of the second clamper can be opened and closed. Is characterized in that the contact surface is made of a smooth and glossy metal material.

In such a packaging device, the tanned skin used for the contact surface of the first clamper generally has a large moisture absorption and moisture permeability, has a function of adjusting moisture in the atmosphere, and has a function of absorbing moisture. It has the property that the area is widened and the flexibility is increased. For this reason, as the humidity increases, the familiarity with the film becomes better, and the adhesion becomes better. At the same time, even if moisture is interposed between the film and the contact surface, this moisture is immediately absorbed by the tanning skin, and the water film is broken through by the fibrous structure of the tanning skin, and the contact surface and the film It is difficult for a water film to be formed between them.

Therefore, in addition to the fact that the contact surface of the second clamper is smooth and has good adhesion to the film, the holding force of the film can be enhanced even when used in an environment with high humidity. It is possible to reliably prevent the film from coming out of the film holding portion when the film is pulled.

Further, since the contact surface of the second clamper is smooth and the frictional resistance between the second clamper and the film is small, the peeling property of the film when the second clamper is moved to the open position is improved. The film becomes good, and the film is hardly entangled or adhered to the film holding portion.

[0021] In order to achieve the above object, the present invention provides a third aspect.
Is characterized in that the contact surface of the second clamper of the film holding portion is covered with a surface layer of aluminum.

According to such a packaging device, the aluminum surface layer generally has better adhesion to the film than the chromium plating layer, so that even when used in an environment with high humidity, it may cause slippage. The effect of moisture can be minimized. For this reason, the holding force of the film is improved, and the film can be reliably prevented from coming out of the film holding portion when the film is pulled.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the entire configuration of the packaging apparatus 1. The packaging device 1 includes a cart 2 and an apparatus main body 3 supported by the cart 2. The apparatus main body 3 has a front panel 3a and a rear panel 3b. The front panel 3a and the rear panel 3b are arranged so as to face each other.

The apparatus main body 3 includes a tray carry-in section 4, a tray carry-out section 5, a tray wrapping section 6, and a film supply section 7. The tray carrying-in section 4 is equipped with a belt conveyor 8. The belt conveyor 8 extends horizontally through the front panel 3 a of the apparatus main body 3. The belt conveyor 8 has a plurality of belts 10 horizontally arranged at intervals in the width direction thereof, and these belts 10 run endlessly in synchronization with each other. The carry-in end 8a of the belt conveyor 8 is led out of the apparatus main body 3, and the carry-out end 8b is guided between the front panel 3a and the rear panel 3b.

A tray 11 containing a packaged object A such as fresh food is supplied to the carry-in end 8a of the belt conveyor 8. The tray 11 is made of, for example, a lightweight resin material such as expanded polystyrene. As shown in FIG. 6, the tray 11 has a flat bottom surface 11a, and four peripheral surfaces 11b extending upward from the periphery of the bottom surface 11a, and has a flat box shape having an open upper end as a whole. I have.

As shown in FIGS. 1 and 3, the tray carrying-out section 5 is arranged at a position higher than the tray carrying-in section 4 between the front panel 3a and the rear panel 3b. The tray unloading section 5 includes a receiving end 12 a for receiving the tray 11 and an unloading end 1 for sending out the tray 11.
2b. The receiving end 12a is adjacent to the discharge end 8b of the belt conveyor 8, and is connected to the discharge end 12b.
b is led out of the apparatus body 3 from between the front panel 3a and the rear panel 3b.

As shown in FIG. 4, the tray carrying-out section 5 has a pair of roller support frames 13a and 13b.
The roller support frames 13a and 13b are parallel to each other and horizontally arranged along a direction orthogonal to the belt conveyor 8. Between these roller support frames 13a and 13b, a folding roller 14, first to third unloading rollers 15a to 15c, a free roller 1
6 and a belt conveyor 17 are supported. These return rollers 14, first to third unloading rollers 15
a to 15c, free roller 16 and belt conveyor 1
Reference numerals 7 are arranged in a line from the receiving end 12a to the discharge end 12b.

The folding roller 14 is located at the receiving end 12a of the tray discharge section 5. The folding roller 14, the first to third unloading rollers 15a to 15c, and the belt conveyor 17 are rotationally driven in the same direction in synchronization with each other by a motor (not shown).
The belt conveyor 17 has a built-in electric heater 18.

As shown in FIGS. 2 and 3, the tray packaging portion 6 is located between the front panel 3a and the rear panel 3b, and is provided at the discharge end 8b of the belt conveyor 8 and the receiving end of the tray discharge portion 5. It is arranged between the portion 12a. The tray packaging section 6 is equipped with a lifter 20. The lifter 20 is for raising the tray 11 sent to the carry-out end 8b, and includes a bracket 21 that can be moved up and down, and a plurality of supporters that are supported by the bracket 21 and that can pass between the belts 10. And a piece 22. Of the support pieces 22, other than the center support piece 22, the other support pieces 22 are, as shown by arrows in FIG.
It is supported by the bracket 21 so as to be rotatable along the traveling direction 0, and is normally held in an upright posture by a spring (not shown).

The bracket 21 is linked to a lifting mechanism 23. Therefore, the support piece 22 of the lifter 20 is
The belt 1 is lowered from the upper surface of the belt 10
The tray 11 is moved up and down over a lowering position facing the bottom surface 11a of the tray 11 placed on the upper side and a raising position for pushing up the tray 11 to the same height as the tray unloading section 5.

As shown in FIG. 3, the film supply unit 7
Are arranged below the tray discharge section 5. The film supply unit 7 includes a reel 25 on which a film F for packaging is wound.
It has. The film F is made of vinyl chloride,
It is transparent and has such flexibility that it can be stretched when pulled. The film F delivered from the reel 25 is guided below the receiving end 12a of the tray unloading section 5 via a tension roller 26 and a pair of guide rollers 27a and 27b.

As shown in FIGS. 4 and 5, below the second carry-out roller 15b, a feeding end F of the film F is provided.
Dispenser 28 for guiding 1 below folding roller 14
Is arranged. The dispenser 28 has a comb shape wider than the film F.
Are supported by the apparatus main body 3 together with the guide rollers 27a and 27b.

Below the folding roller 14, a gripping roller 30 is arranged. The gripping roller 30 is supported by the apparatus main body 3 via a pair of levers 31a and 31b so as to be vertically rotatable. for that reason,
The grip roller 30 is movable between a first position in contact with the folding roller 14 and a second position separated below the folding roller 14.

The levers 31a and 31b are arranged outside the roller support frames 13a and 13b. These levers 31a and 31b are urged upward by a spring (not shown), and this force causes the grip roller 3
0 is always held in the first position. Also, lever 3
Each of 1a and 31b has a bent portion 32 at an intermediate portion thereof. When the gripping roller 30 is rotated to the first position, the bent portion 32 moves the roller supporting frame 13a, 1
3b.

The first discharge roller 15a of the tray discharge section 5
A cutter 33 is disposed below the table. Cutter 33
Is for cutting the film F fed from the reel 25, and is located below the feeding path of the film F. The cutter 33 is moved up and down by a driving mechanism, such as an electromagnetic solenoid (not shown), between a cutting position protruding above the dispenser 28 and a standby position retracted below the dispenser 28. When the cutter 33 is raised to the cutting position, the cutting edge of the cutter 33 enters the cutter receiver 34, and the film F is cut.

As shown in FIGS. 3 and 4, a slider 36 is provided above the tray packaging section 6.
The slider 36 includes a front panel 3a and a rear panel 3b.
And is horizontally arranged so as to extend between them. Slider 3
6 are guided by guide rails 37 (only one is shown in FIG. 3) attached to both panels 3a and 3b.
The tray main body 3 is supported by the apparatus main body 3 so as to be slidable toward and away from the receiving end 12a. The slider 36 is reciprocated by a motor (not shown) between a first slide position adjacent to the receiving end 12a of the tray unloading portion 5 and a second slide position moving away from the receiving end 12a.

As shown in FIG. 5 and FIG.
Has a pressing plate 38 and a folded plate 39. The pressing plate 38 is for feeding the tray 11 pushed up to the raised position by the lifter 20 into the tray carrying-out section 5, and is attached to the center of the slider 36. The return plate 39 is provided with the slider 36.
And projecting substantially horizontally toward the receiving end 12a of the tray carrying-out portion 5, so that the slider 36 comes into contact with the bottom surface 11a of the tray 11 when the slider 36 is slid toward the first sliding position. .

As shown in FIG. 4, the slider 36 has a pair of brackets 40a and 40b. The brackets 40a and 40b protrude from the center of the slider 36 toward the side opposite to the tray discharge section 5. A fork 42 is pivotally supported between the brackets 40a and 40b via a pivot shaft 41 so as to be vertically rotatable.

The fork 42 extends below the slider 36 toward the receiving end 12a of the tray unloading section 5, and a fixed clamper 44 as a first clamper is attached to the tip of the fork 42. Have been. The fixed clamper 44 protrudes toward the tray carrying-out section 5 directly below the folding plate 39, and a roller 45 is rotatably supported at the tip of the fixed clamper 44.

As shown in FIG. 7, the fixed clamper 44
It has a flat plate shape extending in the width direction of the film F.
The fixed clamper 44 is provided at the feeding end F of the film F.
It has a flat pad support surface 46 facing one.
A film pad 48 is supported on the pad support surface 46 via a spacer 47.

As best shown in FIG. 8, the film pad 48 is in contact with the pay-out end F1 of the film F. In the case of the present embodiment, the film pad 48 is made of a material of the same material as the film F. It is made of an elastic body (tradeilon, trade name). The film pad 48
Predetermined depth dimension D along the feeding direction of film F
Has a width of several millimeters having a width L larger than the width of the film F.
8 is fixed to the pad support surface 46 via a double-sided adhesive tape 49 or an adhesive. Therefore, the film pad 48 is located at the tip of the fixed clamper 44 and is adjacent to the roller 45.

The lower surface of the film pad 48 is a flat contact surface 50 that contacts the film F. A plurality of grooves 51 are formed in the first half of the contact surface 50. The grooves 51 extend in the width direction of the film pad 48 and are arranged at an interval in the depth direction of the film pad 48.

The spacer 47 is in the form of a sheet having a thickness of several millimeters, and is interposed between the film pad 48 and the pad support surface 46 at a position corresponding to a position above the first half of the contact surface 50. Have been. This spacer 47
Is fixed to the pad support surface 46 via a double-sided adhesive tape 52 or an adhesive. Therefore, the front half of the film pad 48 projects downward from the rear half of the film pad 48 by an amount corresponding to the height of the spacer 47, and the film pad 4 including the contact surface 50 is provided.
The lower surface of the tapered surface 8 is a tapered surface 50a that is inclined downward as going from the rear end to the front end of the film pad 48.

As shown in FIGS. 5 to 7, one end of an arm 53 is fixed to the pivot shaft 41. The arm 53 extends below the slider 36 toward the tray discharge section 5. A stud bolt 54 is screwed into the tip of the arm 53, and a clamper bracket 56 is fixed to the stud bolt 54 via a nut 55.

On the upper surface of the clamper bracket 56, a second
The movable clamper 58 is screwed. The movable clamper 58 is formed in a comb shape with a metal material, and is located below the fixed clamper 44. The upper surface of the movable clamper 58 is
Form a flat contact surface 59 with which the contact surface 5 contacts.
9 faces the film pad 48. The contact surface 59 of the movable clamper 58 is finished to a smooth and glossy mirror surface by applying a chrome plating process, and the adhesion between the contact surface 59 and the film F is enhanced. .

The movable clamper 58 is arranged such that the contact surface 59 is fixed to the fixed clamper 44 with the pivot shaft 41 as a fulcrum.
The contact surface 59 is rotatable between a closed position in contact with the film pad 48 and an open position in which the contact surface 59 is detached below the film pad 48. The movable clamper 58 is normally rotated toward a closed position via a return spring 60.
4 and 58, a film sandwiching portion 61 for grasping and drawing out the feeding end portion F1 of the film F is constituted.

As shown in FIG. 6, a rotating lever 63 is fixed to the pivot shaft 41. Rotating lever 63
Extends obliquely upward toward the tray discharge section 5,
A roller 64 is supported at the tip of the rotating lever 63. When the slider 36 approaches the first sliding position, the roller 64 moves the cam 65 supported by the apparatus main body 3.
, And is pressed downward. By this pressing, the arm 53 is turned downward via the turning lever 63, and the movable clamper 58 is directed toward the open position, whereby the film holding portion 61 is opened.

When the slider 36 reaches the first sliding position, the film holding portion 61 is positioned below the receiving end 12a of the tray unloading portion 5, and the rotating lever 6
The third roller 64 enters the concave portion 66 at the end of the cam 65. Therefore, the pressing of the rotating lever 63 by the cam 65 is released, and the arm 53 is rotated upward by the return spring 60. This rotation causes the movable clamper 58 to move the film pad 48 of the fixed clamper 44.
The feeding end F1 of the film F is sandwiched between the contact surface 50 of the film pad 48 and the contact surface 59 of the movable clamper 58.

As shown in FIG. 4, a pair of lever pressing members 68a and 68b are disposed at both ends of the slider 36. The lever pressing members 68a, 68b protrude toward the tray discharge section 5, and a cam surface 69 (shown in FIGS. 5 and 6) is formed at the protruding tip. When the slider 36 is slid to the first sliding position, the cam surface 69 moves the bent portion 32 of the levers 31a and 31b.
It comes in contact with. By this contact, the levers 31a and 31b are pivoted downward, and the gripping roller 30 is separated from the folding roller 14.

As shown in FIG. 2 and FIG. 4, a pair of side grippers 71 and 72 are arranged in the tray packaging section 6. The side grippers 71 and 72 are arranged on both sides in the width direction of the film F guided to the tray packaging unit 6. These side grippers 71 and 72 have first to seventh clampers 73a to 73g arranged along side edges F2 and F3 of the film F, respectively. These first
The seventh to seventh clampers 73a to 73g are for grasping the side edges F2 and F3 in the width direction of the film F and pulling them in the width direction, and are supported by the apparatus main body 3 so as to be movable in the direction of coming and coming from each other. And are moved in synchronization with each other by a motor (not shown).

The procedure for packaging the tray 11 containing the articles A to be packaged with the film F in the packaging apparatus 1 having such a configuration will be described with reference to FIGS.

First, at the loading end 8a of the tray loading section 4,
The tray 11 containing the articles to be packaged A is supplied. The tray 11 is carried into the tray packaging section 6 via the belt conveyor 8 as shown in FIG. At this time, the support piece 22 of the lifter 20 is waiting at the lowered position so as not to hinder the loading of the tray 11.

When the tray 11 is carried into the tray packaging section 6, the slider 36 is moved to the first position as shown in FIG.
Is moved to the slide position. Then, first, the lever 3 is pressed by the lever pressing members 68a and 68b of the slider 36.
1a and 31b are pressed downward, and the gripping roller 3
0 is largely separated below the folding roller 14. Thereafter, the fixed clamper 44 and the movable clamper 58 of the film holding section 61 are positioned below the receiving end 12a of the tray unloading section 5, and the clampers 44, 58
Move away from each other and face the dispenser 28. When the slider 36 reaches the first sliding position, the movable clamper 58 is rotated upward, and cooperates with the film pad 48 of the fixed clamper 44 to dispose the dispenser 2.
8, the feeding end F <b> 1 of the film F fed out is gripped.

In this case, the film pad 48 is made of a rubber-like elastic material of the same quality as the film F, and the contact surface 59 of the movable clamper 58 is finished to a smooth and glossy mirror surface. So
The adhesion to the film F becomes good.

Further, since a plurality of grooves 51 are formed in the contact surface 50 of the film pad 48, the feeding end F 1 of the film F is pressed against the contact surface 50 of the film pad 48 via the movable clamper 58. Then, the film pad 48 is elastically deformed, and the opening edge of the groove portion 51 having a sharp edge is pressed into the film F.

At the same time, the lower surface of the film pad 48 including the contact surface 50 has a tapered surface 50a inclined downward as the film pad 48 advances from the rear end to the front end.
Therefore, when the feeding end F1 of the film F is sandwiched in cooperation with the movable clamper 58, the lower surface of the film pad 48 is
Rather, the front end of the contact surface 50 having the groove 51 is intensively pressed against the feeding end F1 of the film F. As a result, when the feeding end F1 of the film F is sandwiched between the film pad 48 and the movable clamper 58, the surface pressure applied to the film F increases, and the film F can be firmly sandwiched.

As shown in FIG. 8, the depth dimension D of the film pad 48 is set to be about twice the clamping width X of the film F between the film pad 48 and the movable clamper 58. When the feeding end F1 of the film F is sandwiched between the movable clamper 48 and the movable clamper 58, the feeding end F1
8 is hard to catch on the rear end.

When the feeding end F1 of the film F is sandwiched between the fixed clamper 44 and the movable clamper 58, FIG.
The slider 36 is slid to the second slide position corresponding to the size of the tray 11 as shown in FIG. Then, the lever pressing members 68a, 6 of the slider 36
The pressing of the levers 31a and 31b by the lever 8b is released, the gripping roller 30 is rotated upward, and the film F is sandwiched between the folding roller 14 and the folding roller 14.

Therefore, the film F is applied to the rollers 14 and 3
Therefore, the film F is pulled out in the feeding direction between the film holding portion 61 and the film holding portion 61, and therefore, the film F is drawn out to the tray packaging portion 6 with an appropriate tension.

When the film F is pulled out, the side grippers 71 and 72 are held at positions away from the side edges F2 and F3 of the film F as shown in FIG. Thereafter, as shown in FIG. 11B, the side grippers 71 and 72 are advanced in a direction approaching each other, and the first to seventh clampers 73a to 73g separate the side edges F2 and F3 of the film F. Be pinched.

Thereafter, the side grippers 71 and 72 are slid in a direction away from each other according to the width of the tray 11, as shown in FIG. As a result, FIG.
As shown in (1), the film F is pulled from both sides along the width direction, and is stretched to a size that can sufficiently cover the tray 11 from above.

Next, as shown in FIGS. 10 (D) and 11 (D), the tray 11 is lifted via the lifter 20, and the film F on which the tray 11 and the article to be packaged A have been greatly elongated. Pressed from below.

When the lifting of the tray 11 is completed, the side grippers 71 and 72 are slid in a direction approaching each other as shown in FIG. The side edges F2 and F3 are folded toward the bottom of the tray 11. By such an operation, the film F pulled out to the tray packaging unit 6 is folded along the bottom surface 11a of the tray 11 from both sides along the width direction.

Next, as shown in FIG. 10E, the slider 36 is slid toward the first sliding position. As a result, the folding plate 39 enters below the tray 11, and the feeding end F1 of the film F gripped by the film holding portion 61 is folded by the folding plate 39 along the bottom surface 11a of the tray 11.

When the slider 36 is further slid, the tray 11 is fed into the receiving end 12 a of the tray discharge section 5 by the pressing plate 38. On this occasion,
The first to seventh clampers 73 a to 73 g of the side grippers 71, 72 are the first clampers 73 a to 73 g,
From the clamper 73g to the seventh clamper 73a closest to the tray carrying-out section 5, and the clamping of the side edges F2 and F3 of the film F is released. Subsequently, the side grippers 71 and 72 slide in a direction away from each other,
It returns to the initial state as shown in FIG.

As shown in FIG. 10F, the tray 11
Is fed into the receiving end portion 12a of the tray discharge section 5, the tray 11 rides on the folding roller 14, the first to third discharge rollers 15a to 15c, and the free roller 16 in this order. Then, as is apparent from FIG. 6, the film F fed from the folding roller 14 is wound around the folding roller 14 so that the direction of the film F is reversed, and the folding roller 14 and the first to third films are returned. Take-out rollers 15a to 15
c and the bottom 11 a of the tray 11. Therefore, the bottom surface 11a of the tray 11 is successively covered with the film F, and the film F whose feeding direction is reversed is the same as that of the film F folded back along the bottom surface 11a of the tray 11 first. It overlaps the side edges F2 and F3.

Next, as shown in FIG. 10G, the cutter 33 moves up to the cutting position, and cuts the film F immediately after the dispenser 28. Cut end F4 of this film F
Is guided to the bottom surface 11a of the tray 11 via the peripheral surface of the folding roller 14 as the feeding operation of the tray 11 progresses.

The wrapped tray 11 is sent to the belt conveyor 17 via the return roller 14, the first to third unloading rollers 15a to 15c and the free roller 16. In the course of the conveyance by the belt conveyor 17, the film F overlapping on the bottom surface 11 a of the tray 11 is heated by the electric heater 18. By this heating, the film F on the bottom surface 11a of the tray 11 is welded, and the film F from the tray 11 is prevented from falling off.

According to the packaging apparatus 1 described above, the film pad 48 of the fixed clamper 44 is made of a rubber-like elastic body of the same quality as the film F, and the contact surface 59 of the movable clamper 58 with the film F is made a mirror surface. Therefore, the adhesion between the film F and the film pad 48 and the adhesion between the film F and the movable clamper 58 are both good, and the film F
Holding power increases.

Therefore, even when the packaging device 1 is used in a high humidity environment such as a kitchen, the contact surface 59 of the film pad 48 and the movable clamper 58 is less likely to be affected by moisture that causes slippage. Thus, the feeding end portion F1 of the film F can be firmly inserted.

Further, according to the above configuration, when the feeding end F1 of the film F is sandwiched, the film pad 48
The edge of the groove 51 becomes a kind of edge and cuts into the film F, and the surface pressure applied to the film F increases with the inclination of the contact surface 50 of the film pad 48.
In addition to the good adhesion to the film F, the feeding end F1 of the film F can be reliably sandwiched.

Accordingly, when the film F guided to the dispenser 28 is gripped and pulled out from the space between the folding roller 14 and the gripping roller 30,
With the side grippers 71, 72, the side edges F2,
When pulling in the width direction across F3, and further, when the tray 11 is applied to the stretched film F from below,
It is possible to reliably prevent the feeding end portion F1 of the film F from falling out of the film holding portion 61.

Therefore, even when the feeding end F 1 of the film F gripped by the film holding portion 61 is folded back along the bottom surface 11 a of the tray 11 with the movement of the slider 36 to the first sliding position. In addition, it is possible to sufficiently secure the overlapping margin between the feeding end portion F1 of the film F and the bottom surface 11a of the tray 11.

As a result, it is possible to solve the conventional defective packaging such that the bottom surface 11a of the tray 11 is partially exposed, and it is possible to prevent a decrease in commercial value.

The contact surface 59 of the movable clamper 58
Since the mirror surface is finished, the frictional resistance between the film F and the film F is reduced, and the releasability of the film F when the movable clamper 58 is turned to the open position is improved. Therefore, the film F is not entangled or adhered to the movable clamper 58 after the feeding end F1 of the film F is released, and the packaging operation of the tray 11 can be continuously and smoothly performed.

The present invention is not limited to the first embodiment, and FIGS. 12 to 14 show a second embodiment of the present invention.

In the second embodiment, the material of the film pad 80 of the fixed clamper 44 is different from that of the first embodiment. This is the same as the first embodiment. Therefore, in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the second embodiment, tanned cow skin is used as the film pad 80. Not only cow leather but also natural leather generally has a large moisture absorption (the amount of water vapor absorbed per unit area of the leather) and moisture permeability (the amount of water vapor that passes through a unit area of the membrane material in a certain period of time) ) Also acts to regulate atmospheric moisture. And
Natural leather has properties such that the area increases when moisture is absorbed, and the flexibility increases.

FIG. 14 shows a leather texture of cowskin used as the film pad 80. In FIG. 14, reference numeral 81 denotes an epidermis, 82 denotes a hair shaft, 83 denotes a hair root, 84 denotes a raised muscle, 85 denotes a sweat gland, 86 denotes a fiber, 87 denotes a silver layer, 88
Denotes a mesh layer, 89 denotes a boundary layer, and 90 denotes a wall layer.

The fiber 86 has a helical structure in which various amino acids are linked in a chain, and several hundred fibers are assembled into a fiber bundle, and these fiber bundles are further aggregated and finally cross-linked. doing. Therefore, the mesh layer 88 has a fiber structure in which countless fibers 86 are crossed to form a network structure. The fibers of the reticulated layer 88 are slightly stiff and have high strength because they are thick and have high density, whereas the fibers of the grain surface layer 87 are thin and flexible but have low strength. Moreover, especially in cowskin, the fibers are thick, dense, and interlaced, so that a good fiber structure can be obtained.

Cowhide having such a fiber structure is shown in FIG.
As shown by a two-dot chain line in FIG. 4, the cut surface A is cut off along with the wall surface layer 90 at a cutting line A passing through the mesh layer 88, and the cut surface, in other words, the lower surface where the fiber structure is exposed, is It is used as a contact surface 91. And
Cowhide is fixed to the pad support surface 46 of the fixed clamper 44 via a double-sided adhesive tape 49 or an adhesive with its contact surface 91 facing the movable clamper 58.

A pedestal 93 is interposed between the pad support surface 46 and the film pad 80. Pedestal 93
Is made of an elastic material such as polyurethane sponge rubber, and the pedestal 93 has a sheet shape having a size corresponding to the film pad 80 and a thickness of several mm. The pedestal 93 has a front half 93a and a rear half 93b.
And The first half 93a and the second half 93b are arranged in the direction in which the film F is fed out, and the thickness of the first half 93a is set to be larger than the thickness of the second half 93b.

The pedestal 93 is fixed to the pad support surface 46 of the fixed clamper 44 via a double-sided adhesive tape 94 or an adhesive. Therefore, the front half of the film pad 80 projects downward from the rear half of the film pad 80 by an amount corresponding to the thickness difference between the front half 93a and the rear half 93b of the base 93. The contact surface 91 of the film pad 80 is a tapered surface 80a that is inclined downward as going from the rear end to the front end of the film pad 80.

According to such a configuration, when tanned cowhide is used as the film pad 80, this cowhide has the property of increasing its area and increasing its flexibility when absorbing moisture, so that the humidity increases. Accordingly, familiarity with the film F is improved, and adhesion to the film F is improved.

[0086] Further, since the cowhide uses the lower surface where the fiber structure is exposed as the contact surface 91 with the film F, even if moisture is interposed between the film F and the contact surface 91, this moisture is Will be immediately absorbed by the innumerable fibers, and water will not easily remain as a water film between the film F and the contact surface 91. With it,
Even if a water film is formed between the film F and the contact surface 91, this water film will be quickly pierced by the end of the fiber, and the water film will be formed between the film F and the film pad 80. Is less likely to slip.

Therefore, the feeding end F1 of the film F can be reliably sandwiched in addition to the good adhesiveness between the cow skin and the film F, and the feeding end F1 of the film F is gripped and the folding roller is held. When the film 11 is pulled out from between the gripper roller 14 and the gripping roller 30 or when the film 11 is pulled in the width direction across the side edges F2 and F3 of the film F by the side grippers 71 and 72, the tray 11 is further lowered on the stretched film F. , The feeding end portion F1 of the film F can be reliably prevented from falling out of the film holding portion 61.

Also, according to the above configuration, the contact surface 91 of the film pad 80 is a tapered surface 80a that is inclined downward as it goes from the rear end to the front end of the film pad 80. When the feeding end portion F1 of the film F is sandwiched, the contact surface 91 of the film pad 8 is not
Rather, its front end is intensively pressed against the feeding end F1 of the film F. Therefore, between the film pad 80 and the movable clamper 58, the feeding end portion F of the film F
When 1 is inserted, the surface pressure applied to the film F increases, and the film F can be inserted more firmly.

FIG. 15 and FIG. 16 disclose a third embodiment of the present invention. The third embodiment is different from the first embodiment mainly in the material of the film pad 100 and the configuration of the movable clamper 58 as the second clamper. The other basic configurations are as follows. , And the same as the first embodiment.

The film pad 100 of the fixed clamper 44
Is made of polyurethane sponge rubber (trade name: Balcolan) having an open-cell structure. The film pad 100 has a width such that it covers the entire width of the fixed clamper 44, and has a band shape with a thickness of several millimeters. The upper surface of the film pad 100 has a double-sided adhesive tape 102 or an adhesive. The fixed clamper 44 is fixed to the pad support surface 46.

The lower surface of the film pad 100 is a contact surface 103 in contact with the film F. The contact surface 103 has a front half 103a and a rear half 103b, and the rear half 103b is inclined downward as approaching the front half 103a.

On the contact surface 59 of the movable clamper 58, a protective tape 105 is overlaid. Protection tape 1
Numeral 05 is made of an aluminum foil having a smooth and glossy surface 105a, and the back surface of the protective tape 105 is fixed to the contact surface 59 via an adhesive (not shown) or a double-sided adhesive tape. This protective tape 10
Reference numeral 5 designates an aluminum surface layer covering the contact surface 59, and the surface 105a of the protective tape 105 is in contact with the film F.

According to such a configuration, since the surface 105a of the protective tape 105 made of aluminum foil is generally smoother than the mirror surface obtained by chrome plating, the adhesion to the film F is further improved. For this reason, even when the packaging operation is performed in an environment with high humidity, the contact surface 59 of the movable clamper 58 is hardly affected by the moisture that causes the slip, and the feeding end F1 of the film F is firmly fixed. Can be sandwiched.

The contact surface 10 of the film pad 100
3, the film pad 100 is inclined downward as it advances from the rear end to the front end, so that when the feeding end F1 of the film F is sandwiched in cooperation with the movable clamper 58, the front end of the film F F is intensively pressed against the pay-out end F1, and the surface pressure applied to the film F increases accordingly. Therefore, the holding force of the film F increases, and it is possible to reliably prevent the film F from coming out of the film holding portion 61 when the film F is pulled in the feeding direction and the width direction.

In the third embodiment, the aluminum foil tape is adhered to the contact surface 50 of the fixed clamper 44. However, the present invention is not limited to this. For example, the contact surface 50 of the fixed clamper 44 may be used. The contact surface 50 may be covered with a glossy aluminum surface layer by subjecting the contact surface 50 to aluminum vapor deposition or aluminum sputtering.

The surface layer obtained by the aluminum vapor deposition process or the aluminum sputtering process has a higher smoothness than the mirror surface obtained by chromium plating, similarly to the aluminum foil, so that the adhesion to the film F is improved. Become. For this reason, even when the packaging operation is performed in an environment with high humidity, the contact surface 59 of the movable clamper 58 is hardly affected by the moisture that causes the slip, and the feeding end F1 of the film F is firmly fixed. Can be sandwiched.

In the first embodiment,
The film pad is made of the same material as the film, and the contact surface of the movable clamper is subjected to chrome plating. However, the contact surface of the movable clamper may be subjected to aluminum vapor deposition or aluminum sputtering. .
That is, a combination of the film pad according to the first embodiment and the movable clamper according to the third or fourth embodiment, or a combination of the film pad according to the second embodiment and the third embodiment.
Alternatively, a combination with the movable clamper of the fourth embodiment is possible.

Further, in each of the above embodiments, only the second clamper (movable clamper) is opened / closed. However, in some cases, the first clamper (fixed clamper) is used.
May be opened and closed in synchronization with the second clamper.

[0099]

According to the present invention described in detail above, the adhesion between the film and the first clamper and between the film and the second clamper are both good, so that the packaging device can be used in a high humidity environment such as a kitchen. Even when used in an environment, the contact surfaces of both clampers are less susceptible to moisture that causes slippage, and the feeding end of the film can be firmly sandwiched.

Therefore, since the holding force of the film is increased as compared with the conventional case, it is ensured that the edge of the film comes out of the film holding portion when the edge of the film is gripped and pulled out or when the gripped film is stretched. This has the advantage that packaging defects are less likely to occur, and that the reliability of the packaging operation using the packaging film is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a packaging device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a tray loading unit and a tray packaging unit of the packaging device.

FIG. 3 is a plan view of the packaging apparatus showing a positional relationship between a tray packaging section and a tray carry-out section of the packaging apparatus.

FIG. 4 is a plan view showing a state where a film drawn out to a tray packaging unit is pulled in a width direction.

FIG. 5 is a cross-sectional view showing a state in which the film holding portion grips the film feeding end and pulls out the film.

FIG. 6 is a cross-sectional view showing a state in which a wrapped tray is pushed out from a tray wrapping section to a tray discharge section.

FIG. 7 is an exploded perspective view showing a film holding portion.

FIG. 8 is a cross-sectional view showing a state where a film feeding end is sandwiched between a fixed clamper and a movable clamper.

FIG. 9 is a perspective view of a fixed clamper and a film pad.

FIGS. 10A to 10H are schematic diagrams showing a procedure for folding a film fed from a reel from both sides along the feeding direction toward the bottom of the tray.

FIGS. 11A to 11F are schematic diagrams showing a procedure of folding a film fed from a reel from both sides along the width direction to the bottom of the tray.

FIG. 12 is a cross-sectional view showing a state in which a film feeding end is sandwiched between a fixed clamper and a movable clamper in the second embodiment of the present invention.

FIG. 13 is a perspective view of a fixed clamper and a film pad.

FIG. 14 is a cross-sectional view showing a configuration of tanned cow skin.

FIG. 15 is a cross-sectional view showing a state where a film feeding end is sandwiched between a fixed clamper and a movable clamper in the third embodiment of the present invention.

FIG. 16 is a perspective view of a fixed clamper and a film pad.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Tray 44 ... First clamper (fixed clamper) 50 ... Contact surface 58 ... Second clamper (movable clamper) 59 ... Contact surface 61 ... Film holding portion 105 ... Surface layer (protective tape) A ... Package F …the film

Claims (3)

[Claims] When packaging a tray containing an object to be packaged using a packaging film, the film holding section has a film holding section for holding an end of the film, and the film is held by the film holding section. In the packaging device configured to be pulled out to a position covering the tray, the film holding portion includes a first clamper and a second clamper facing each other, and the second clamper cooperates with the first clamper. And openable and closable between a closed position sandwiching the end of the film and an open position detached from the end of the film, and a contact surface of the first clamper with the film is made of the same material as the film. The contact surface of the second clamper with the film is made of a smooth and glossy metal material. Packaging apparatus according to symptoms. 2. When packaging a tray in which an object is stored using a film for packaging, the film holding portion has a film holding portion for holding an end of the film, and the film is held by the film holding portion. In the packaging device configured to be pulled out to a position covering the tray, the film holding portion includes a first clamper and a second clamper facing each other, and the second clamper cooperates with the first clamper. The film can be opened and closed between a closed position for sandwiching an end of the film and an open position detached from the end of the film, and a contact surface of the first clamper with the film is made of tanned leather. And a contact surface with the film in the second clamper is made of a smooth and glossy metal material. 3. A film holding section for holding an end portion of the film when the tray containing the objects to be housed is packed using a packaging film, and the film holding section holds the film with the film holding section. In a packaging apparatus configured to grasp and pull out the tray to a position covering the tray, the film holding portion includes a first clamper and a second clamper facing each other, and the second clamper is connected to the first clamper. The first clamper and the second clamper can cooperate to open and close between a closed position where the end of the film is sandwiched and an open position where the end is separated from the end of the film. A packaging apparatus having a contact surface in contact with an end portion, wherein the contact surface of the second clamper is covered with a surface layer of aluminum.