JPH07315333A - Transfer device of film in packing machine - Google Patents

Abstract

PURPOSE:To nip or release a film without control of ambient temperature or moisture, by providing a plurality of narrow protrusions having a specified size at the contact side of the film along the driving direction of the drive belt. CONSTITUTION:A transfer device M1 of a film is constituted of a driven belt 14 intermittently circulated at the lower part of both sides of the film F, a transferable free belt 28 nipping the edge of film, a clamp lever 24 raising the driven belt 14, and a support bracket 34 supporting the upper face of the free belt 28 and regulating the position. A plurality of protrusions 15 having 0.5-1.5mm in the breadthwise dimension of the end face 15a, parallelly arranged with interposed recessed grooves 16 in the breadthwise direction of the belt 14 are provided at the contact face with the film F of respective driven belts 14. In this way, when the clamp lever 24 is lowered, the film F is easily peeled off from the driven belt 14 and securely released. And the film F can be prevented from breaking or mispacking on packing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine for packaging an object to be packaged, which is placed on a tray, with a stretch film together with the tray. The present invention relates to a film transporting device that clamps and transports a film, and releases the film after the packaging.

[0002]

2. Description of the Related Art Conventionally, in a stretch film packaging machine,
A stretch film made of polyvinyl chloride or the like of a specified length (hereinafter simply referred to as a film) is held in advance at the packaging position with the peripheral edge being sandwiched, and the packaged item such as perishable food is passed through the packaging position. The tray is lifted from below, the upper surface of the tray is covered with the stretched film, then the sandwiching of the film is released, and the excess film is folded on the lower surface of the tray to package the packaged product together with the tray.

A conventional film transporting device holds both side edges of a film cut into a predetermined length, as known from Japanese Utility Model Laid-Open Nos. 2-69802 and 3-102409. The driving belts are respectively arranged below the both side edges of the film and are driven to intermittently circulate in the horizontal direction so that the nipping can be released after the wrapping, and both side edges of the film can be nipped. And a clamp lever that raises the drive belt in the packaging position so that both side edges of the film can be clamped, and a free belt that is freely movable and disposed above both edges of the film. And a support bracket that supports the upper surface of the free belt to regulate the position of the free belt.

Further, as shown in FIG. 1, the drive belt 54
Is a ridge 55 formed in the width direction so that the film can be conveyed without slipping when the film is nipped and conveyed.
Are arranged side by side along the driving direction, and each ridge end surface 55a is made smooth so that the film is not adhered to the ridge 55 to prevent the film from coming off when the edges of the film are clamped. The drive belt 54 is composed of a main body 54a made of a thermoplastic resin and a base cloth 54b. The end face 55a of the ridge 55 is heated and melted to be smooth, and the width w0 of the end face 55a is set to 3. 0mm, height h0 is 3.
The width w1 of the groove 56 was 0 mm and the width w1 was 3.0 mm.

On the other hand, the free belt is composed of a flat belt made of cloth, the surface side of which is in contact with the film being flat.

[0006]

However, in the conventional film transport apparatus, the drive belt is a belt belt in which ridges having a smooth surface are juxtaposed in the transport direction, and when the edges of the film are clamped, The adhesive strength of the film to the smooth ridge surface was used.

Therefore, when the ambient temperature is low and the humidity is high, the adhesive force is not sufficient, and the film comes off during packaging, so that proper packaging cannot be performed.

On the contrary, when the ambient temperature is high and the humidity is low, the adhesive force becomes too high, and even if the clamp lever is lowered to release the pinch, the film sticks to the ridge end surface of the drive belt. Since the film is folded in that state, the film is torn.

In order to solve the above problem, it is possible to control the temperature and humidity of the film, but it takes a lot of time and effort.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a film transporting device which can appropriately clamp and release the film without controlling the ambient temperature and humidity. And

[0011]

A film transport apparatus according to the present invention holds a stretch film having a predetermined length by sandwiching both side edges of the stretch film and transports the stretched film in a horizontal direction, stops the transport at a packaging position, and ascends from below. A film transport device of a packaging machine for releasing the sandwiching of both side edges of the film after covering the article to be packaged, which is arranged below the both side edges of the film and is driven by intermittent circulation in the horizontal direction. A drive belt and free belts that are respectively disposed above the both side edges of the film so that the edge of the film can be sandwiched between the drive belts and freely movable, and below the edge of the film at the packaging position. The clamp lever for raising each of the drive belts and the upper surface side of each of the free belts arranged above the edge of the film at the wrapping position. A support bracket for holding and regulating the position, wherein the drive belts are arranged side by side on the surface side in contact with the film along the drive direction and with a groove in the width direction of the drive belt. The width of the end face is 0.5 to
It is characterized in that it is provided with a plurality of protrusions having a length of 1.5 mm, and each of the free belts is configured such that the front surface side in contact with the film is flat.

It is desirable that the position regulating surface of the free belt in each of the support brackets is arranged so as to be inclined downward with respect to the center side of the film.

[0013]

In the film transporting device according to the present invention, the end face is provided side by side with the groove on the surface side of the drive belt in contact with the film along the drive direction and in the width direction of the drive belt. Is provided with a plurality of ridges having a width dimension of 0.5 to 1.5 mm.

That is, since the ridges of the drive belt are formed by narrowing the width of the end faces, the film is unlikely to stick to the ridges, and the mode in which both side edges of the film are sandwiched is the sticking of the end faces of the ridges. Instead of using the force, the action of the ridges biting into the film is used to sandwich between the drive belt and the free belt.

Therefore, if the clamp lever is pushed up, the edge of the film can be held between the drive belt and the free belt, and if the clamp lever is lowered, the film is peeled from the ridge end surface of the drive belt. The film can be easily released and the film can be reliably released.

Therefore, in the film conveying apparatus according to the present invention, the film can be properly clamped and unclamped without controlling the temperature and humidity of the surroundings, and the film is torn or packaged at the time of packaging. Can be prevented.

When the position limiting surface of the free belt in each of the support brackets is arranged to be inclined downward with respect to the center side of the film, a ridge that bites strongly into the film at the time of sandwiching is formed in the center of the film. It can be defined in the first row on the side, the position of pinching / unpinning the film can be stabilized, and the pinching and unpinching of the film can be performed more accurately. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 3 to 5, the film transporting device M1 used in the packaging machine of the embodiment has a pair of left and right drive belts 14 (14L and 14R) and a pair of left and right free belts 28 (28L and 28R). ), A pair of left and right clamp levers 20 (20L and 20R), and clamp levers 24 (24L) arranged in front of and behind each clamp lever 20.
24R) and a pair of left and right support brackets 34 (34L)
.34R), and as shown in FIG.
It is arranged in front of a feeding / cutting device M2 that feeds and cuts the film F0 from the original roll 1.

As shown in FIG. 2, the drive belt 14 is composed of a urethane main body 14a and a base cloth 14b. The drive belt 14 extends along the drive direction on the surface side of the main body 14a.
4 is provided with a plurality of ridges 15 arranged side by side with a V-shaped groove 16 interposed therebetween. In the case of the embodiment, these ridges 15 have a width w2 of the end surface 15a of 1.0.
mm, height h1 is 1.0 mm, width w3 of the groove 16 is 1.0 mm
I am trying.

A pair of left and right drive belts 14L.1
4R is horizontally wound around the driving roller 17 and the rotatable driven roller 18 so as to be driven by intermittent circulation.

A pair of left and right free belts 28L and 28R
Is configured as a flat flat belt made of cloth, and is wound around the free rollers 29 and 30 that are rotatable and is wound around the guide rollers 31 and 32 that is rotatable to drive each drive belt 14L.・ It is located above 14R.

A pair of left and right clamp levers 20L and 20R
Are formed of a synthetic resin such as nylon so as to reduce sliding resistance with the drive belts 14, are arranged below the upper portion 14U of each drive belt 14, and are attached to the upper end of the lever 21a of the link mechanism 21. It is supported. The lever 21a has a center supported by a pin 21b and is swingable, and has the other end connected to a solenoid 22 and a coil spring 23. Each clamp lever 20 has a coil spring 2
The upper portion 14U of the drive belt 14 is normally pushed upward by the urging force of 3, and the film F is sandwiched. Then, when the solenoid 22 is excited, the lever 21a rotates against the urging force of the coil spring 23 and is pulled down, so that the clamping is released.

Like the clamp lever 20, the clamp levers 24 arranged on the left and right sides are provided with two drive belts 14.
It is made of synthetic resin such as nylon so as to reduce the sliding resistance with and is pivotally supported on the upper end of the lever 25a of the link mechanism 25. The lever 25a is supported by a pin 25b at the center and is swingable. The other end is connected to the solenoid 26 and the coil spring 27. The clamp levers 24 are configured such that the urging force of the coil springs 27 always pushes the upper portion 14U of the drive belt 14 upward to clamp the film F, and when the solenoid 26 is excited. In addition, the lever 25a rotates against the urging force of the coil spring 27 and is pulled down, so that the clamping is released.

Two clamp levers 24 are provided on each of the left and right sides.
Is the tray W1 and the article W to be packaged placed on the tray W1.
When wrapping the article W0 consisting of 2 and 2 with the film F1 (see FIG. 9), after the clamping release operation of the clamp levers 20 and 20, the clamping release operation is performed quickly or the clamping release operation is performed slightly later. Thereby, the tension of the film F1 when the packaged object W0 is packaged is adjusted.

The pair of support brackets 34L and 34R are
The cross-section is L-shaped with the horizontal plate portion 34a and the vertical plate portion 34d, and the front end side of the horizontal plate portion 34a is arranged on the center side of the film F1. Further, a resin plate 34b made of synthetic resin such as nylon is fixed to the lower surface of the horizontal plate portion 34a in order to reduce sliding resistance with the free belt 28, and the lower surface of the resin plate 34b is connected to the free belt. The position regulating surface 34c is opposed to the upper surface side of the lower part 28B of 28. The position restricting surface 34c is inclined so that the tip side is lowered, and the angle α from the horizontal direction is
It is 1 degree.

The vertical plate portion 34d of each support bracket 34 is
It is fixed to the outer side 36a of the side plates 36a and 36b of the support frames 36 and 36 that cover both side surfaces of the lower portion 14B of each drive belt 14. Each support frame 36, 36
In addition to the support bracket 34, is a drive roller 17, a driven roller 18, a free roller 29, which are arranged on the left and right sides.
30, guide rollers 31, 32 shafts and pins 21b, 25
b, or the ends of the coil springs 23 and 25 are held.

The pair of left and right support frames 36,
The support frame 36L on the left side of 36 is a bush 38 that is mounted on guide rods 40 arranged at two front and rear positions.
Is fixed to the base 36c at the bottom, and the support frame 36R on the right side is a guide rod 40 arranged at two front and rear positions.
The female screw member 39 that is screwed into the male screw portion 40a is fixed to the base 36c at the bottom.

These guide rods 40, 40 are rotated in a predetermined direction when the width of the film F is changed in accordance with the width of the tray W1, so that the support frame 36R side is brought closer to the support frame 36L side. Drive belts 14L and 14R and free belts 28L and 28R
Thus, the adjustment is performed so that the both side edges of the film F can be properly clamped.

Above the rear end side of each drive belt 14, as shown in FIGS. 4 and 6, a holding belt 9 in the feeding and cutting device M2 is arranged.

The feeding and cutting device M2 will be briefly described. As shown in FIG. 6, the feeding and cutting device M2 winds a film F0 around a rotatable original fabric roll 1 and a film F0 from the original fabric roll 1. A rotatable guide roller 2 for guiding, drive rollers 3 and 4 which are driven to rotate intermittently by a rotary drive source (not shown), and a rotatable pressing roller 5 disposed above the drive roller 4 and having a rubber 5a wound around its outer periphery. A saw blade-shaped cutter 6 that moves upward by a solenoid (not shown), and pressing plates 7 and 7 arranged above the cutter 6, and further arranged above the rear end of each drive belt 14. And a pressing lever 12 that is disposed below the pressing belts 9 in the vicinity of each pressing belt 9 and is movable upward.

Film transporting device M1 and feeding / cutting device M2
6, the front end of the film F0 is arranged at the front end position of the pressing belt 9 in advance as shown in FIG. 6, and when the drive rollers 3, 4, and 17 are rotationally driven from that state, the film F0 The leading end of the film F0 is sequentially fed out from the original roll 1 by the nipping / conveying of the pressing belt 9 and the driving belt 14 and the nipping / conveying of the driving belts 14L / 14R and the free belts 28L / 28R. The tip of F0 advances.

When the leading edge of the film F0 is placed at a predetermined position, as shown in FIG.
The rotation drive of 17 is stopped, the cutter 6 rises, and the cut C is made in the film F0.

Thereafter, when the driving rollers 3, 4, 17 are rotationally driven and the cut C of the film F0 is arranged at the front end portion of the pressing belt 9, the rotational driving of the driving rollers 3, 4 is stopped, and The presser lever 12 moves upward,
The film F0 on the rear side of the break C is pressed by the pressing belt 9.

At this time, since the drive rollers 17 and 17 are continuously driven to rotate, as shown in FIG.
The film F0 on the front side of the drive belt 14L, 14R
Both side edges are sandwiched between the free belt 17L and the free belt 17L, and the free belts 17L and 17R are transported, cut at the cut C, and transported to a predetermined packaging position S as a film F1 having a predetermined length.

After that, in the film transport device M1, when the film F1 is placed in the packaging position S, the drive roller 17
The rotation drive of 17 is stopped, and the drive belts 14L and 14R and the free belts 28L and 28 are attached to both side edges of the film F1.
It will stand by in a state of being sandwiched by R.

Then, as shown in FIG.
Is arranged below the packaging position S by the package supply device M3 of the packaging machine M0 and raised by the lift device M4 of the packaging machine M0, the film F1 extends on the upper surface side of the package W0 while stretching. It will be covered.

After that, the solenoids 22 and 26 are sequentially excited, the clamp levers 20 and 24 are lowered, and the upper portion 14U of the drive belts 14L and 14R is lowered.
The sandwiching of both side edges of the film F1 is released, and the packaged object W
On the lower surface side of 0, the surplus film F1 is folded by a folding device (not shown) and discharged to a predetermined position.

Thereafter, the presser lever 12 moves downward to release the pressing of the film F0 on the presser belt 9, and the excitation of the solenoids 22 and 26 is released, so that the clamp levers 20 and 24 move to the coil springs 23 and 26. The driving belts 14L and 14R sandwich the film F0 between the pressing belt 9 and the driving belts 14L and 14R.
Is driven to rotate, and the steps described above are repeated.

The drive rollers 3, 4, 17, cutter 6, presser lever 12, solenoids 22, 26 are operated in advance according to the size of the article W0 to be film F1.
Corresponding to the setting of the length, the control device (not shown) sequentially controls the drive rollers 3, 4, and 17 according to the rotation angle.

In the film transporting device M1 of the embodiment, the drive belts 14L and 14R are provided on the surface side of the drive belts 14L and 14R which is in contact with the films F1 and F0 along the drive direction.
Are arranged side by side in the width direction of the groove with a groove 16 interposed therebetween, and the end surface 15a
It has a plurality of protrusions 15 having a width dimension w2 of 1.0 mm.

That is, the protrusion 15 of each drive belt 14
However, since the width of the end face 15a is narrowed, it is difficult for the films F1 and F0 to adhere to the ridges 15.
A mode in which both side edges of 1 · F0 are sandwiched is the end surface 1 of the ridge 15.
Rather than using the adhesive force of 5a, the drive belt 1 uses the action of the ridges 15 biting into the films F1 and F0.
4L / 14R and the free belt 28L / 28R are sandwiched.

Therefore, when the clamp levers 20 and 24 are pushed up, the edges of the films F1 and F0 can be held between the drive belt 14 and the free belt 28, and when the clamp levers 20 and 24 are lowered, Drive belt 1
The film F1 is easily peeled off from the protruding end surface 15a of No. 4, and the sandwiching of the film F1 can be reliably released.

Therefore, the film transport device M of the embodiment
With No. 1, the film F1 and F0 can be properly clamped and unclamped without controlling the ambient temperature and humidity, and tearing of the film during packaging and mistakes in packaging can be prevented.

Then, each support bracket 34L / 34R
In the case where the position regulating surface 34c of the free belt 28 in the above is arranged so as to be inclined downward with respect to the center side of the film F, the ridges 15 that bite strongly into the film F when sandwiched.
Can be defined in the first row on the center side of the film F, and the position of pinching / unpinning the film F can be stabilized, and the pinching and unpinching of the film F can be more accurately performed. It can be done accurately.

In the embodiment, the width dimension w2 of the ridge end surface 15a of each drive belt 14 is set to 1.0 mm. However, if the width dimension w2 is too wide, the film F1. 1.5mm because F0 sticks
The following is desirable, and if it is too thin, the films F1 and F0 will be damaged when sandwiched. Then, the width dimension w of the groove 16
3 may be 0.5 to 1.5 mm, which is about the same as the protrusion end surface 15a.

[Brief description of drawings]

FIG. 1 is a perspective view of a drive belt used in a conventional film transport device.

FIG. 2 is a perspective view of a drive belt used in the film transport device according to the embodiment of the present invention.

3 is a vertical cross-sectional view of the same embodiment, taken along line III-III of FIG.
Corresponds to the part.

FIG. 4 is a vertical cross-sectional view of the same embodiment, which corresponds to a portion IV-IV in FIG.

FIG. 5 is a plan view of the same embodiment.

FIG. 6 is a vertical cross-sectional view showing the initial state of operation of the embodiment.

7 is a vertical cross-sectional view showing a state after the state shown in FIG.

FIG. 8 is a vertical cross-sectional view showing a state after the state shown in FIG.

FIG. 9 is a vertical cross-sectional view showing a packaging state of the embodiment.

[Explanation of symbols]

 14 (14L / 14R) ... drive belt, 15 ... ridge, 15a ... end face, 16 ... groove, 20/24 ... clamp lever, 28 (28L / 28R) ... free belt, 34 (34L / 34R) ... support bracket , 34c ... Position regulation surface, W0 ... Object to be packaged, F0 / F1 ... Film, M0 ... Packaging machine, M1 ... Film transport device.

Claims (2)

[Claims] 1. A stretch film having a predetermined length is sandwiched at both side edges to be conveyed in a horizontal direction, the conveyance is stopped at a packaging position, and an object to be packaged rising from below is covered with the film, and then the film is formed. Is a film transporting device of a packaging machine for releasing the sandwiching of both side edges of the film, the drive belts being respectively disposed below the both side edges of the film and being driven to intermittently circulate in the horizontal direction; Free belts that are respectively arranged above the both side edges of the film so as to be able to hold the edges, and are freely movable, and a clamp lever that raises the drive belts that are arranged below the edges of the film in the packaging position, A support bracket that supports the upper surface side of each of the free belts arranged above the edge of the film at the packaging position to regulate the position. The drive belts are arranged side by side on the surface side in contact with the film along the drive direction and with a groove in the width direction of the drive belt, and the end face has a width dimension of 0.5 to 1.5 mm. A plurality of ridges are provided, and each of the free belts is configured to have a flat surface side in contact with the film, the film transport apparatus of a packaging machine. 2. The packaging machine according to claim 1, wherein a position restriction surface of the free belt in each of the support brackets is arranged so as to be inclined downward with respect to a center side of the film. Film transport device.