JPH11171114A - Stretch-wrap packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretch-wrap packaging machine which can prevent problems such as film cutting. SOLUTION: The stretch-wrap packaging machine is constituted to cause an object 1 to be packaged to be carried by a conveyer 2 to pass between film guides 5, put a film 3 released from a film supplying device 4 over the object 1, also lead both ends of the film 3 under the object 1 to have the film 3 put over the object 1 like a cylinder, cut the film 3 before and after the object 1 and fold the film into the object 1 for packaging in the film. An extension guide roller 18 in contact with the film 3 between the film supplying device 4 and the film guides 5 is provided between the film supplying device 4 and the film guides 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transporting, for example, a tray by means of a conveyor device, while conveying a strip-shaped stretch film in the same direction as the tray above the conveyor device, and expanding the stretch film. The present invention relates to a stretch wrapping machine that is wrapped in a tubular shape around a tray and packed.

[0002]

2. Description of the Related Art Conventionally, fresh foods such as fish, meat and fruits are stored in a tray, and a spreadable film (stretch film) is placed around the tray while being stretched from above, and polymerized at a lower portion of the tray. There are many packaging machines that cut and fold the film between the trays. However, since the stretch film used at this time has a very high adhesiveness, if the film is simply covered on the tray, the expansion effect is impaired on the upper surface of the tray, and wrinkles are generated. If the tray is soft or the contents to be accommodated in the tray are soft when placed on the tray as it is, it will be crushed because the film tension acts directly on the tray and the contents. There was something.

Therefore, the film is stretched and supported inside a left and right film supply device which feeds and feeds the film by sandwiching both side edges of the film by a belt conveyer arranged vertically, and above a tray which conveys the film on the conveyor device. A film guide section is provided.

[0004] That is, a film supply device is provided on both sides of the conveyor device, the belt conveyor device being vertically opposed to each other, and a film supply device for sandwiching and extending a side end of the film is disposed in a downwardly inclined state in the transport direction. A film guide portion is provided inside the supply device and on both sides of the conveyor device, which has a length in the transport direction and stretches and supports the film, and the height of the upper edge portion of the film guide portion is slightly higher than the height of the tray. (For example, Japanese Utility Model Publication No. Sho 62-31361,
156417).

[0005] With this configuration, since the film guide portion is installed higher than the upper surface of the tray, the film slides on the upper edge portion of the film guide portion when the film is stretched, so that the film contacts the tray. No wrinkles occur while holding the entire film in a uniform tension state without applying a large load to the upper edge and contents of the tray when feeding the film, and releasing the left and right film extensions by the film guide. In this case, the film is stretched on the upper surface of the tray, and the film is wound around the tray in a tubular shape.

[0006]

However, in such a conventional stretch wrapping machine, the film that has just protruded from the film supply device is stretched and supported by the upper edge of the film guide section, and is conveyed in this expanded state. It is a configuration to do.

[0007] That is, the left and right ends of the film are merely sandwiched by the belt conveyer devices arranged up and down, and only extend to the upper edge of the inner film guide portion.

Therefore, for example, as described above, the film supply device is provided so as to be inclined downward in the transport direction with respect to the film guide portion, and the holding of the film is released at the downwardly inclined transport front end portion. Due to the configuration, the film sandwiched by the upper and lower belt conveyor devices of the film supply device will be stretched diagonally inward and upward, and the stretched film contacts the edge portion of the upper belt conveyor device, When the film tension acts only on the edge portion, the film may be cut at the edge portion.

At this time, the space between the left and right film supply devices and the inner left and right film guides is reduced due to restrictions on the width of the device, or the height of the tray is high, so that the film supply device with respect to the film guides is not used. The lower the height of the film holding portion, the steeper the angle of the film stretched from the film supply device to the inner film guide portion, the more the film contacts the edge portion, and the more the tension is concentrated. And film breakage may occur.

In particular, when the temperature is low, the film stretches poorly and the film is likely to break.

The present invention focuses on such a problem, and solves such a problem by a simple improvement means, and provides an epoch-making stretch wrapping machine capable of preventing a problem such as film breakage. It is intended to provide.

[0012]

The gist of the present invention will be described with reference to the accompanying drawings.

Conveyor device 2 for placing and transporting packaged object 1
A pair of film supply devices 4 for extending and sending out the film 3 are disposed on the left and right sides of the film supply device 4 in a downwardly inclined state toward the transport direction of the packaged object 1. A pair of film guides 5 for stretching the film 3 stretched by 4 above the conveyor device 2 is provided, and the packaged object 1 is transported by the conveyor device 2 and passed between the film guide portions 5. The film 3 released from the film supply device 4 is placed on the package 1 from above, and both ends of the film 3 are guided to the lower side of the package 1 to move the film 3 to the package 1. A stretch wrapping machine configured to cut the film 3 before and after the article to be packaged 1 and fold the film 3 into the article to be packaged, wherein the film 3 is wrapped. Between the supply device 4 and the film guide 5, deployed guide roller abutting the film 3 between the film feeding device 4 and the film guide 5
The present invention relates to a stretch wrapping machine characterized by having 18 provided.

The extension guide roller (18) is provided inside a portion where the film holding portion (4D) of the film supply device (4) is positioned lower than the film guide portion (5). And a stretch wrapping machine.

The film supply device 4 is provided with a belt conveyor device 4A which is wound and conveyed vertically, and the film feeder 4A is provided with the upper and lower belt conveyor devices 4A.
, And the extension guide rollers 18 are provided inside the belt conveyor device 4A above the film supply device 4, and the inner side of the belt conveyor device 4A above and below the film supply device 4. A guide surface 17 that guides the film 3 spread on the film guide portion 5 so that the direction of expansion of the film 3 does not come into contact with the edge portion 4B of the upper belt conveyor device 4A is a peripheral surface of the expansion guide roller 18. The stretch wrapping machine according to any one of claims 1 and 2, wherein

The guide surface 17 is provided so that the direction of extension of the film 3 extended from the upper and lower belt conveyors 4A of the film supply device 4 to the inner film guide portion 5 is the same as that of the upper belt conveyor 4A. A first guide surface portion 17A that guides the film 3 so as not to come into contact with the edge portion 4B;
And a second guide surface portion 17B for guiding the stretch packaging machine.

The stretch wrapping machine according to any one of claims 1 to 4, wherein the extension guide roller 18 is configured to be freely rotatable.

A mounting shaft 19 projects inward coaxially with the rotary shaft 4C of the belt conveyor device 4A on the upper side of the film supply device 4, and the extension guide roller 18 is mounted on the mounting shaft 19. The stretch wrapping machine according to any one of claims 3 to 5, wherein the stretch wrapping machine is provided so as to be freely rotatable.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be briefly described with reference to the drawings, which are examples of embodiments, showing the functions and effects.

An article to be packaged 1 (for example, a tray 1 containing contents) is conveyed by a conveyor apparatus 2 and a film supply apparatus 4 provided on both left and right sides of the conveyor apparatus 2.
As a result, the left and right ends of the film 3 are sandwiched, and the film 3 is sent out in the tray conveying direction in an extended state.

The film 3 is conveyed by the film guide portions 5 provided on the left and right sides of the conveyor device 2.
The film 3 is covered from above the tray 1 by the disappearance of the film stretching action by the film guide unit 5 and the release of the stretching and pinching by the film supply device 4, and the left and right sides of the released film 3 are supported. Both ends are guided to the lower center of the tray 1 to transfer the film 3 to the tray 1.
Then, the film 3 before and after the tray 1 is cut, and the tray 1 is folded and packaged.

At this time, in the present invention, the film 3 which is extended from the left and right film supply devices 4 to the left and right film guide portions 5 inside the film supply device is placed between the film supply device 4 and the film guide portion 5. The film 3 is guided in a predetermined direction of extension by contacting the guide surface 17 on the peripheral surface of the extension guide roller 18 provided in the above, and following the shape of the guide surface 17.

That is, the film 3 overhanging from the film supply device 4 is not simply stretched toward the film guide portion 5 obliquely upward from the film holding portion 4D as it is as in the conventional example. The film 3 is guided by the guide surface 17 of the roller 18 in a direction avoiding the edge 4B of the film supply device 4 where the film 3 may be caught and the film may be cut off, and is extended and guided to the film guide 5 obliquely upward.

More specifically, for example, when the film supply device 4 is configured to hold the side end of the film 3 by the upper and lower belt conveyor devices 4A, the roller 18
The upper and lower belt conveyor devices 4A
From the film holding portion 4D so as to project in a substantially horizontal inward direction which does not contact the inner edge portion 4B of the upper and lower belt conveyor device 4A.
The film 3 is guided so that the film 3 smoothly and gradually extends inward and upward, and is stretched over the upper edge of the film guide portion 5.

Thus, by simply providing the guide roller 17 having a guide surface 17 for abutting against the film 3 and guiding the stretch direction in a predetermined direction inside the film supply device 4, the guide surface 17 Since the spreading tension of the film 3 is dispersed, it is possible to prevent the spreading tension of the film 3 from being concentrated on the film holding portion 4D of the belt conveyor device 4A above and below the film supply device 4, and for example, the edge of the belt conveyor device 4A It is possible to prevent the film 3 to be stretched and conveyed from contacting the portion 4B, thereby preventing the film from being cut at the edge portion 4B, and to maintain a smooth film conveyance without any trouble.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

In the present embodiment, a transparent resin-made tray 1 having an open top box for storing foods such as mushrooms and strawberries as an article to be packaged 1 is stretched from above by a stretch film 3 having high adhesiveness and extensibility. The present invention is applied to a packaging machine that wraps in a cylindrical shape and folds the front and rear ends to be cut into the lower side of a tray to stretch-wrap.

In the stretch wrapping machine of the present embodiment, a film coating is carried out in which the belt-like film 3 is drawn out in the tray conveying direction above the tray 1 to be horizontally conveyed while the film 3 is in contact with the tray 1 from above the tray 1. Process part A and film 3 from the unloading side while further transporting tray 1
And a film packaging process portion B in which the left and right ends of the film 3 are guided to the lower center of the tray 1 and the film 3 is packaged in the tray 1 in a tubular shape, and the film 3 between the sequentially conveyed and packaged trays 1 And a film cutting / packaging completion process portion C in which the front and rear ends of the cut film are folded under the tray 1 and the tray 1 after the stretch packaging is carried out.

First, specific examples of the film coating step A, which is a main part of the present invention, will be described.

A belt-like stretch film 3 is stretched on both left and right sides of a conveyor device 2 for horizontally placing and transporting the tray 1 forward and pulled out from a film roll 3A above the conveyor device 2 while being stretched. Further, a pair of film supply devices 4 for feeding the film in the tray conveyance direction are provided.

The left and right film supply devices 4 are configured so that the belt conveyor device 4A to be wound and transported is brought close to the upper and lower sides, and the side ends of the film 3 are nipped and conveyed by the upper and lower belt conveyor devices 4A. .

That is, the left and right side edges of the film 3 pulled out from the film roll 3A are nipped by the upper and lower belt conveyor devices 4A arranged on the left and right, and the film 3 is moved by the feed movement of the belt conveyor device 4A.
In the transport direction.

The left and right film supply devices 4 are provided to be inclined downward in the direction in which the tray 1 is conveyed.

In this manner, the film 3 is configured to be gradually stretched from left and right while being stretched strongly. In this embodiment, the film holding portion 4D at the leading end of the transport is lower than the lower surface of the tray 1 on the conveyor device 2. It is configured to come to a low position.

The film 3, which is sandwiched between the left and right ends at both left and right sides of the conveyor device 2, is located inside the left and right film supply devices 4 and on the left and right sides of the conveyor device 2.
Film guide part 5 that is stretched and supported above (tray 1)
Is arranged.

The left and right film guides 5 are formed of plate-like members having a length in the transport direction, and their upper guide edges 5A are arranged at the same height in the left and right directions, and the tray 1 is horizontally transported by the conveyor device 2. The film 3 is stretched and supported above, and the film 3 is horizontally stretched and held above the tray 1 while the film 3 is fed out to slide the guide upper edge 5A by the above-mentioned feeding (in the present embodiment, (Moves in the length direction of the film guide portion 5).

Therefore, the film 3 does not come into contact with the tray 1 until the film stretching action by the film guide portion 5 is eliminated, and the film 3 is stretched above the tray 1 in the extended state by the left and right film supply devices 4. It is configured to be sent out in the transport direction while being bridged.

On the other hand, when the film 3 passes the film release position P at the leading end in the transport direction where the pinching of the film side end is released by the upper and lower belt conveyor devices 4A of the film supply device 4, that is, specifically, Conveyor device 4
After the film release position P at which the pinching of the film 3 by the belts is released at the end of A, the film feed roller 9 in the film packaging process portion B overlaps both edges of the film 3 to form the film into a tube. Guide edges provided on the guide shaft 10 and the guide plate 11 for guiding the both edges of the film 3 while continuing to transport while ensuring the
The film 3 released from the belt conveyor device 4A is guided to the lower center of the tray 1 by a film guide mechanism 13 such as 12;
The film 3 is configured to be covered from above the tray 1 past the front end portion Q in the transport direction.

In this embodiment, the tray 1 is continuously conveyed by the second conveyor device 14 for sandwiching and conveying the tray 1 from both right and left sides, and the film 3 is wound around the tray 1 by the film guide mechanism 13 in a cylindrical shape. I have.

In this embodiment, the upper edge 5A of the guide 5 of the film guide 5 is partially extended to the upper edge 1 of the tray 1.
A, the leading end in the carrying direction is gradually lowered and inclined toward the carrying direction. At the leading end Q, the height located slightly above the upper edge of the tray 1 is increased. It is configured to be.

That is, the film 3 stretched by the film supply device 4 is drawn out and conveyed while being horizontally stretched and supported considerably above the tray 1 to a certain extent, and gradually descends near the film release position P. , Tray 1
Will be lowered to near the upper part of.

The leading end Q of the upper edge 5A of the guide 1 on the side of the tray 1 in the direction of conveyance surely protrudes from the film release position P toward the direction of conveyance of the tray 1. Until the stretching is released, the film stretching action by the upper edge portion 5A of the guide is securely held.

Further, since the film 3 can be sufficiently positioned near the upper portion of the tray 1, the film 3 can be brought into contact with the tray 1 immediately after the extension is released without delaying the timing even if the degree of protrusion is slight. As a result, the film 1 can be covered so that a strong spreading tension is not applied to the tray 1 and wrinkles are not generated as much as possible.

Further, in this embodiment, a round rod-shaped endless belt 7 which does not easily damage the film 3 is movably suspended between the roller portions 6 which are freely rotatably provided, and the film 3 is attached to the endless belt 7. The film guide portion 5 is configured such that the film guide portion 5 is supported by a tension.

Accordingly, the structure of the film guide portion 5 having the above-mentioned functions and effects can be easily realized, and the moving and transporting of the film 3 becomes smooth, so that the stretch packaging machine is extremely practical.

That is, even if the film 3 does not slide and convey on the guide upper edge 5A, in the present embodiment, the endless belt 7 suspended by a roller functioning as the guide upper edge 5A is used. The endless belt 7 is fed by the action of friction in accordance with the transport movement of the film 3 so that the film 3 can be transported smoothly without being damaged.

Further, the film guide portion 5 of this embodiment is
As shown in FIG. 7, a mounting hole 5 provided in an upper edge portion of the mounting plate 5B.
C, the roller portion 6 is supported by a shaft, an endless belt 7 is suspended between the roller portions 6, and the film 3 is stretched and supported on the upper endless belt 7. ,
A number of reference lines 5D are formed on the surface of the mounting plate 5B at predetermined intervals vertically, and the mounting fixture 5E is loosened using the reference line 5D as a guide to move the mounting plate 5B up and down along the mounting guide groove 5F. The film guide portion 5 is configured to be able to adjust and set the height of the endless belt 7 which is the upper edge 5A of the film guide portion 5.

That is, according to the height of the tray 1 to be conveyed,
The transfer surface HA of the tray 1 is a predetermined reference line 5D of the mounting plate 5B.
The height of the upper edge portion 5A of the film guide portion 5 from the transport surface HA can be accurately adjusted and changed.

Therefore, since the position of the mounting plate 5B to be matched with the height of the conveying surface HA of the conveyor device 2 is clarified by the reference line 5D, the adjustment can be performed accurately and easily.

Further, since the reference line 5D is provided at a constant interval, when a certain reference line 5D is aligned with the transport surface HA,
The height of the upper edge portion 5A of the film guide portion 5 from the transport surface HA can be easily grasped.

In this embodiment, the transport surface H of the conveyor device 2
Although the reference line 5D is aligned with the reference line A, a predetermined alignment position may be provided on the mounting side of the mounting plate 5B so that the reference line 5D is adjusted to this alignment position. By aligning this reference line 5D with the surface HA), it is possible to know as a numerical value how high the upper edge 5A of the film guide portion 5 (the upper edge of the endless belt 7) is with respect to the transport surface HA. Alternatively, numerical values may be displayed on some predetermined reference lines 5D.

For example, guide lines 5D are formed at intervals of 10 mm, and 75 mm, 65 mm, and 55 mm are sequentially arranged from the lower guide line 5D.
If the numerical value is displayed as mm ..., for example, the conveyor device 2
The height of the upper edge 5A of the film guide portion 5 from the transport surface HA can be automatically adjusted to 65 mm by fixing the mounting plate 5B so that the transport surface HA is aligned with the second reference line 5D from the bottom. Becomes

In the specific example, numerical values are displayed on the reference line 5D for adjusting the height from the transport surface HA. However, the height of the tray 1 to be used is numerically displayed on the predetermined reference line 5D, and the tray 1 to be used is displayed. It is possible to easily know which reference line 5D to match in accordance with the above, or to set the distance (height) value from this reference line to each of the other reference lines 5D using the predetermined reference line 5D as a reference line. Numerical values may be displayed.

In this embodiment, in such a stretch wrapping machine, the film 3 between the film supply device 4 and the film guide portion 5 is provided between the film supply device 4 and the film guide portion 5. Rolling guide rollers 18 that contact each other are provided on the left and right.

That is, in the present embodiment, the extension guide roller 18 is provided inside the film holding portion 4D located at a height lower than the film guide portion 5 of the film supply device 4.
And the direction of extension of the film 3 extending from the film holding portion 4D of the upper and lower belt conveyor devices 4A of the film supply device 4 toward the inner film guide portion 5 is the same as that of the upper belt conveyor device 4A. A first guide surface portion 17A that guides the film 3 so as not to come into contact with the edge portion 4B, and a second guide that guides the film 3 onto the film guide portion 5 that is gradually extended upward and inward and upward. The guide surface 17 provided with the surface portion 17B connected in the rotation axis direction is
Is provided on the peripheral surface.

More specifically, a mounting shaft 19 is protruded inward coaxially with the rotating shaft portion 4C of the upper belt conveyor device 4A of each of the left and right film supply devices 4, and this mounting shaft 19 is provided.
The roller 18 for extension guide is freely rotatable.
Therefore, a mounting shaft 19 is provided using the rotating shaft portion 4C as a roller shaft for supporting the belt, which is a component of the belt conveyor device 4A.
Since the roller 18 can be easily mounted at a position close to the belt conveyor device 4A, the production is easy, the cost is not increased, and the practicality is excellent. In addition, even if the free roller is provided so as to be freely rotatable, even if it comes into contact with the film 3 and guides the direction of extension, the film rolls freely due to friction with the film 3 and the film transport resistance is small, which hinders the film transport. Not.

Further, the roller 18 for the extension guide of this embodiment
Has a trapezoidal cross section as shown in FIGS.

That is, the large-diameter peripheral surface of the extension guide roller 18 near the film supply device 4 is extended from the upper and lower belt conveyor devices 4A of the film supply device 4 to the inside of the film guide portion 5. The direction in which the film 3 extends is the edge portion 4 of the upper belt conveyor device 4A.
A first guide surface portion 17A that guides so as to project in a substantially horizontal direction so as not to come into contact with B, and a tapered peripheral surface formed continuously with the first guide surface portion 17A is formed such that the outer diameter gradually decreases so that the extending direction is increased. A second guide surface portion 17B for guiding the film 3 onto the film guide portion 5 which is located gradually inward and upward is formed.

Therefore, the film 3 which is extended from the left and right film supply devices 4 to the left and right film guide portions 5 inside the film supply device 4 is provided with a stretching guide provided between the film supply device 4 and the film guide portion 5. The film 3 contacts the guide surface 17 on the peripheral surface of the use roller 18 and the film 3 follows the shape of the guide surface 17 so that the film 3 is guided in a predetermined extending direction.

That is, the film 3 protruding from the film supply device 4 is simply stretched toward the film guide portion 5 obliquely upward from the edge portion 4B, which is the film holding portion 4D, just as in the conventional example. Instead, when the guide surface 17 of the extension guide roller 18 abuts on the film 3 between the film supply unit 4 and the film guide unit 5, the film supply unit may come into contact with the film 3 and cause a film break. Edge part 4 of 4
B is once extended in a direction to avoid B, and is extended and guided to the film guide portion 5 obliquely upward.

Specifically, the upper and lower belt conveyors 4
Although the side end of the film 3 is pinched by the film pinching portion 4D of A and protrudes inward, the roller
The film 3 is guided by the first guide surface portion 17A of the guide surface 17 so as to project in a substantially horizontal inward direction that does not contact the inner edge portion 4B of the upper and lower belt conveyor device 4A, and the second guide surface portion 17B The film 3 is guided so as to be stretched smoothly and gradually upward inward and stretched over the upper edge of the film guide portion 5.

As a result, the film 3 is brought into contact with the guide surface 17 of the extension guide roller 18 which is provided to protrude inward from left to right by simply using the belt conveyor device 4A of the film supply device 4. The spreading tension is dispersed, so that the spreading tension of the film 3 can be prevented from being concentrated on the film holding portion 4D of the upper and lower belt conveyor devices 4A of the film supply device 4, and the film can be prevented from being cut. Therefore, it is possible to maintain a smooth film transport without any trouble.

Further, in this embodiment, since the first guide surface portion 17A and the second guide surface portion 17B have the trapezoidal cross section, the film 3 comes into contact with the guide surface 17 on the outer peripheral surface, and the extending direction is regulated. Is guided in a predetermined direction, so that it is guided so as to protrude in the horizontal direction so as to avoid the edge portion 4B such as the belt edge portion of the belt conveyor device 4A, and further rises sharply inside the belt conveyor device 4A. Therefore, the film 3 is smoothly guided upward so as not to form a corner where the film 3 is caught.

Therefore, even if the film 3 is pressed and guided by the guide surface 17 of the extension guide roller 18, the guide surface 17 is formed to have a smooth curved surface, so that there is no trouble in the film conveyance. The roller 18 for rolling guide rolls in accordance with the transport of the film 3, so that there is no further problem in transporting the film.

Accordingly, even when the temperature is low, the film breakage is unlikely to occur, so that the temperature range in which the apparatus can be operated stably is dramatically expanded.

In this embodiment, the descending inclination of the film supply device 4 and the film supply device 4 and the film guide portion 5
The shape of the guide surface 17 of the extension guide roller 18 can be appropriately designed depending on various conditions such as the distance between the extension guide roller 18 and, for example, in this embodiment, two portions for the extension guide are provided inside each film supply device 4. Although the rollers 18 are provided, the shape of the guide surface 17 of each of the extension guide rollers 18 is different depending on the above-mentioned conditions at the arrangement position.

For example, in this embodiment, as shown in FIG. 6A, the guide surface 17 of the extension guide roller 18 is formed by a first guide surface portion 17A and a second guide surface portion 17B. FIG. 6
As shown in (B), the guide surface 17 composed of the first guide surface portion 17A and the second guide surface portion 17B is formed by a smooth surface in which both surfaces (17A, 17B) are continuously formed. Is also good.

In this embodiment, the film supply device 4
Since the guide roller 18 is mounted on the mounting shaft 19 protruding from the guide roller 17, it is easy to change and replace the guide roller 18 in response to a change in the design of the guide surface 17 due to the above-mentioned various conditions.

Next, the film packaging step B and the film cutting and packaging completion step C will be briefly described.

As described above, while the tray 1 is being transferred from the conveyor device 2 to the second conveyor device 14 of the left-right sandwiching type, the leading end of the film supply device 4 in the transport direction (having a height lower than the tray transport position). While the film 3 released at the film release position P is conveyed by the feed roller 9, the left and right side edges of the film are guided by the guide mechanism 13 so as to overlap the lower center of the tray 1. It is configured to be wound in a shape.

The film 3 between the trays 1 is cut by the cutting device 15 descending between the trays 1 to be packaged as described above, and the cut end is folded toward the lower surface of the tray 1. .

In this way, the tray 1 on which the stretch packaging has been completed is carried out to the carry-out conveyor 16.

In the above-described embodiment, the film feeding device 4 is provided with upper and lower belt conveyors 4A, and the film 3 is interposed between the upper and lower belt conveyors 4A, 4A.
The endless chain is provided on the left and right sides, and the endless chain is rotatably provided by a sprocket, and a plurality of films are formed at predetermined intervals with respect to the endless chain. A film supply device of a type that includes a clip for holding the film 3 and transports the film 3 while holding both side ends of the film 3 with the clip.

[0074]

The present invention is constructed as described above.
According to the first and second aspects of the present invention, the stretching guide rollers having the guide surfaces are simply provided on the left and right sides of the inside of the film supply device so as to face each other. It is an epoch-making stretch wrapping machine that can be sent and conveyed, and is extremely unlikely to cause film breakage.

According to the third aspect of the present invention, the film can be reliably pinched by the upper and lower belt conveyors, sent out and transported in an extended state, and the film tension is concentrated on the edge of the belt conveyor. This makes it possible to reliably prevent the film from being cut off due to the film being caught or rubbed, thereby providing a stretch wrapping machine with extremely high practicality.

According to the fourth aspect of the present invention, it is possible to reliably prevent the film from being cut at the edge of the belt conveyor device, and to smoothly move the film extending direction without suddenly leading upward. This is an even more innovative stretch packaging machine that can stretch and convey films.

According to the fifth aspect of the present invention, the stretch guide roller is freely rotatable, so that the film can be transported without any trouble, and a more excellent stretch packaging machine capable of realizing smoother stretch transport can be realized.

Further, according to the sixth aspect of the present invention, it is possible to easily attach the roller for the stretch guide, and it is possible to extremely easily realize the present invention with a simple improvement in an existing stretch wrapping machine. It becomes a packaging machine.

[Brief description of the drawings]

FIG. 1 is a schematic configuration side view of the present embodiment.

FIG. 2 is a schematic configuration plan view of the present embodiment.

FIG. 3 is an enlarged schematic side view of a main part of the embodiment.

FIG. 4 is an enlarged schematic perspective view of a main part of the embodiment.

FIG. 5 is an enlarged explanatory front view of a main part of the embodiment.

FIG. 6 is an explanatory diagram showing another example shape of the extension guide roller of the present embodiment.

FIG. 7 is an explanatory side view illustrating a configuration of a film guide section of the present embodiment.

[Explanation of symbols]

 Reference Signs List 1 Packaged object (tray) 2 Conveyor device 3 Film 4 Film supply device 4A Belt conveyor device 4B Edge portion 4C Rotation shaft portion 4D Film sandwiching portion 5 Film guide portion 17 Guide surface 17A First guide surface portion 17B Second guide surface portion 18 Extension Guide roller 19 Mounting shaft

Claims (6)

[Claims] 1. A pair of film supply devices for extending and sending out a film are disposed on both left and right sides of a conveyor device for placing and transporting an article to be packaged, in a downwardly inclined state in a transport direction of the article to be packaged, A pair of film guide portions for extending the film stretched by the film supply device above the conveyor device is provided inside the film supply device, and the packaged object is transported by the conveyor device and the film guide portion is interposed between the film guide portions. Through which the film released from the film supply device is placed on the packaged object from above, and both ends of the film are guided to the lower side of the packaged object, and the film is formed into a cylindrical shape on the packaged object. Over
A stretch packaging machine configured to cut a film before and after the object to be packaged and fold the film into the object to be packaged, and between the film supply device and the film guide unit, A stretch wrapping machine provided with a stretch guide roller abutting on a film between the film guide portion. 2. The stretch wrapping machine according to claim 1, wherein the stretch guide roller is provided inside a portion where the film holding portion of the film supply device is located at a height lower than the film guide portion. . 3. The film supply device according to claim 1, wherein a belt conveyor device that is wound and conveyed is vertically opposed to each other, and a side end of the film is sandwiched by the upper and lower belt conveyor devices. The extension guide roller is provided inside the upper belt conveyor device, and the direction in which the film is extended from the upper and lower belt conveyor devices of the film supply device to the inner film guide portion is the upper belt conveyor device. The stretch wrapping machine according to any one of claims 1 and 2, wherein a guide surface for guiding the roller so as not to come into contact with an edge portion of the stretch guide roller is provided on a peripheral surface of the extension guide roller. 4. A direction in which the direction of extension of the film extended from the upper and lower belt conveyor devices of the film supply device to the inner film guide portion does not contact the edge portion of the upper belt conveyor device. And a second guide surface for guiding the film onto the film guide located on the upper side inward with the extending direction gradually directed upward. Item 6. The stretch packaging machine according to Item 3. 5. The stretch wrapping machine according to claim 1, wherein the extension guide roller is configured to be freely rotatable. 6. A mounting shaft is protruded inwardly coaxially with a rotation shaft of a belt conveyor device above the film supply device, and the expansion guide roller is provided on the mounting shaft in a freely rotatable manner. The method according to claim 3, wherein:
Stretch wrapping machine according to item.