KR20000016814A - Stretch wrapping device - Google Patents

Abstract

PURPOSE: A stretch wrapping device is provided to perfectly prevent the approach of the strong stretching force in a tray by arranging a front end of transferring direction of a film guiding unit to be projected. CONSTITUTION: A stretch wrapping device comprises:a film covering process part(A) to withdraw a band-shaped film(3) from the upper tray(1) to horizontally transfer toward a transferring direction of a tray(1) in a stretched state, and to contact the film(3) in the tray(1) upward the tray(1); a film wrapping process part(B) to transfer the tray(1), to receive the film(3) from a carrying side, and to wrap the film(3) in the tray(1) in a tub shape by leading the left and the right ends of the film(3) in the lower middle of the tray(1); and a film cutting and wrapping finishing process part(C) to cut the film(3) between wrapped tray(1) by transferring sequentially, and to throw the front and the rear ends of the cut film to the low of the tray(1), and to carry out the tray(1) finished the wrapping.

Description

Stretch packing machine

Conventionally, fresh food such as fish, meat, fruit, etc. are accommodated in a tray, covered with a stretchable film (stretch film) from the top around the tray while being stretched, overlapping each other at the bottom of the tray, and cutting the film between the trays. There are many packing machines that can be folded. However, since the stretch film used at this time is very adherent, only covering the film on the tray may cause damage to the electric field on the upper surface of the tray, wrinkles, or vice versa. When the contents are fragile or the contents contained in the trays are fragile, they are crushed because the electric field force of the film directly acts on the trays and the contents.

Thus, a film guide part is provided on the upper side of the tray transported on the conveyor device inside the left and right film supply apparatuses which support both sides of the film to feed and supply the film.

That is, the film guide parts which have a length in a conveyance direction are provided in the both sides of a conveyor apparatus, and the height of the upper edge part of the film guide part which hangs and hold | maintains this film was made to transport a little higher than the height of a tray (for example, in Japan Japanese Unexamined Patent Publication No. 62-31361 and Japanese Unexamined Patent Application Publication No. 6-156417.

Since the film guide part is installed higher than the upper surface of the tray, the film slides the upper edge of the film guide part and does not come into contact with the tray. While keeping the entire film in a uniform tension state without placing a large load on the contents, and releasing the left and right film lengths by the film guide part to prevent wrinkles, and also by placing the film on the upper surface of the tray It is wrapped around the tray.

However, in such a conventional stretch packaging machine, although the film guide part is provided as mentioned above, since only the conveyance direction front end part of the said film guide part is arrange | positioned so that it may be located in the conveyance direction side front end of the said film supply apparatus, for example, If the length of the film is slightly retracted from the transport direction end of the film direction of the film supply apparatus, the film length of the film guide device is still slightly retracted from the film release position of the film supply device. The film, which has been unwound, presses the tray from top to bottom, causing the tray to be under heavy load.

Since the tray is somewhat rigid, it is better not to be deformed or crushed to the extent that the film is subjected to the electric load of the film. For example, the tray is crushed due to little rigidity such as a tray with strawberries. There may be a problem. That is, depending on the type of the tray, there is a possibility that the packaging may be disturbed by the load due to the film electric field force due to the deviation of the positional relationship between the slight film guide portion and the distal end portion of each film feed apparatus. .

It is an object of the present invention to provide a breakthrough stretch packaging machine which is very practical and can solve such problems by focusing on such a problem.

The present invention transports a tray by a conveyor device, while transporting a strip-shaped stretch film in the same direction as the tray at the upper side of the conveyor device, while simultaneously stretching the stretch film. The present invention relates to a stretch wrapper that is wrapped around a cylindrical shape and wrapped.

1 is a schematic side view of the present embodiment;

2 is a schematic configuration plan view of this embodiment;

3 is a schematic front view of a principal part of the present embodiment;

4 is an enlarged schematic perspective view of a main part of this embodiment;

Fig. 5 is an enlarged explanatory side view of the main part when the tray of this embodiment reaches the film release position;

6 is an enlarged side view of the main part at the point where the film contacts the tray past the transport position where the tray of the present embodiment coincides with the film release position;

7 is an enlarged exploded front view of a main part before the tray of this embodiment reaches a transport position that coincides with a film release position;

8 is an enlarged exploded front view of a main part at the time when the tray of this embodiment reaches a transport position that matches the film release position;

Fig. 9 is an enlarged front view of the main part at the time when the film contacts the tray past the transport position where the tray of this embodiment coincides with the film release position.

The tray containing the contents is transported by the conveyor apparatus, and the film is fed to the tray transport direction in the full length state by inserting the left and right ends at both sides by the film supply apparatuses installed on the left and right sides of the conveyor apparatus.

The film is held tightly on the conveyor by the film guides provided by the left and right sides of the conveyor device, and the film guide part loses the film tensioning action and releases the electric field clamping by the film supply device. The film is covered from the top of the tray, and the left and right ends of the released film are guided to the bottom center of the tray to cover the film in a cylindrical shape, and the front and rear films of the tray are cut and folded into the tray to pack the tray. .

At this time, in the present invention, even if the tray is transported by the conveyor apparatus to a transport position that matches the film release position where the pinching of the film of the film supply apparatus from the left and right sides to the full length state is still carried out at this point in the film. The film guide portion is squeezed tightly, and the electric field force of the film does not reach the tray, and even if the tray is fragile, it is not deformed or pressed.

That is, the film has a strong electric field force by being inserted at both ends by the left and right film supply devices until the transport position coincides with the film release position, but in this strong electric field state, the film is still secured above the tray due to the existence of the film guide part. It is held tightly so that this strong electric field strength does not reach a tray.

Then, when the tray is transported to the carrying out side than the transport position coinciding with the film release position, the film full-length narrowing on both the left and right sides is released, and when the film tensioning action of the film guide portion is transmitted to the tray (in the example described later) In this case, when the film is sent and conveyed to the tray while the state of the film guide part is released by passing through the tip of the transport direction side, the height of the film guide part is gradually lowered and the electric field strength is weakened. In the case of conveying a tightly held state of the film to the tray at a position equal to or lower than the height of the tray), and since the left and right sides of the film are released by the film feeder, the action of pressing down from the upper side of the tray The film is covered from the top with the tray being restrained and the film with the tray It is transported.

Therefore, in the present invention, the tip of the film direction of the film guide portion is projected to the transport direction side rather than the film release position so that the film-tightening action of the film guide portion is conveyed to the tray after the state where the film is fully length-clamped is released. The strong electric strength of the film does not reach the tray reliably, making it possible to transport and pack even a soft tray regardless of the type of tray.

Moreover, by designing this protrusion degree small, it can comprise so that a film may contact a tray from upper part immediately after the said film full length release | release, and this timing may be comprised so that a noticeable wrinkle may not be produced in a film late.

Specific embodiments of the present invention will be described with reference to the drawings.

In this embodiment, for example, the upper opening box-shaped transparent resin tray 1 containing foods such as mushrooms and strawberries is wrapped in a tubular shape from above by a stretch film 3 having high adhesion and elasticity. The present invention is applied to a packing machine that folds the cut front and rear ends down a tray and packages the same.

The stretch wrapper of this embodiment pulls the film 3 from the upper side of the tray 1 while pulling the strip-shaped film 3 on the upper side of the horizontal conveying tray 1 in the tray conveying direction in the full length state. The film coating process portion A to be brought into contact with the film, and the tray 1 is transported, and the left and right ends of the film 3 are guided to the lower center of the tray 1 while the film 3 is 3) The film packaging step (B) for wrapping the tray 1 into a tubular shape and the film 3 between the trays 1 transported and packaged in sequence are cut, and the front and rear ends of the cut film are removed from the tray ( 1) It consists of a film cutting and packaging completed process part (C) which folds down and takes out the tray 1 which has been wrapped.

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

Film roll 3A on top of conveyor apparatus 2 in a state in which the strip-shaped stretch film 3 is fitted on the left and right sides of the conveyor apparatus 2 for transporting the tray 1 horizontally forward and horizontally. A pair of film feed apparatuses 4 which are fed out in the tray conveying direction while being pulled out are arranged.

The left and right film supply apparatuses 4 are configured to approach the belt conveyor apparatus 4A wound and conveyed up and down, and the side end of the film 3 is full length clamped by the belt conveyor apparatus 4A above and below.

That is, the left and right end edges of the film 3 pulled out from the film roll 3A by the upper and lower belt conveyor devices 4A arranged left and right are fitted, and the film ( 3) is sent out in the transport direction of the tray 1.

In addition, the left and right film supply apparatuses 4 are respectively provided in a downwardly inclined state toward the transport direction of the tray 1.

As a result, the film 3 is gradually pulled from the left and the right so as to be fully extended, and in this embodiment, the film 3 is configured to be positioned at a position lower than the lower surface of the tray 1 on the conveyor apparatus 2 at the transport tip.

In addition, inside the left and right film supply apparatus 4, the left and right ends of the left and right ends of the conveyor apparatus 2 are fitted to the film 3, and the film 3 is placed above the conveyor apparatus 2 (tray 1). The film guide part 5 which hangs and supports is arrange | positioned.

The left and right film guide portions 5 have a length in the transport direction, and the guide upper edge portions 5A are arranged on the same length as the left and right films on the upper side of the tray 1 transported horizontally by the conveyor apparatus 2. Guide (3A) guides the edges of the film (3A) by feeding the film (3) while keeping the film (3) taut and horizontally taut while keeping the film (3) full length above the tray (1). Is configured to slide (move in the longitudinal direction of the film guide part 5 in this embodiment).

Therefore, the film 3 does not contact the tray 1 until the film tensioning action by the film guide part 5 is eliminated, and the film 3 is full length by the left and right film supply devices 4. It is comprised so that it may be sent in a conveyance direction, with the state tensioned on the upper part of the tray 1 in a state.

On the other hand, when the film 3 passes the film release position P of the transport direction side front end part which the insertion of the film side end was released by the upper and lower belt conveyor apparatus 4A of the film supply apparatus 4, ie specifically, a belt At the end of the conveyor apparatus 4A, when the film 3 insertion by the belts passes through the released film position P, the film 3 is moved by the film sending roller 9 of the film packaging step B. Guide edges (12) provided on the guide shaft (10) and the guide plate (11) for guiding the edges of the film (3) while continuing transportation while overlapping the edges of both ends to ensure the cylindrical shape of the film. The film 3 released from the belt conveyor device 4A by the film guide mechanism 13 such as) is guided to the lower center of the tray 1, and the conveying direction of the film guide part 5 is upward. After the side tip Q, the film 3 It is configured to be covered from the top.

In the present embodiment, the film 3 is passed through the tray 1 by the second conveyor device 14 which transports the tray 1 from both left and right sides, and the film guide mechanism 13 allows the film 3 to pass through. It is comprised so that it may wind around in shape.

In this stretch packaging machine, the tray 1 on the conveyor device 2 of the film guide part 5A is extended to the end of the transport direction side tip Q. It is set at a position higher than the upper edge height, and the end of the transport direction side tip Q of the guide upper edge portion 5A of the film guide portion 5 is more reliably moved to the transportation direction side than the film release position P. It is set to protrude.

That is, as shown in Fig. 5 and Fig. 6, when the apparatus is viewed from the side, the guide upper edge portion 5A of the film guide portion 5 is larger than the film release position P in the positional relationship with respect to the transport direction. The transport direction side tip Q is configured to protrude in the transport direction of the tray 1.

Thus, as shown in Figs. 5 and 8, the film release position where the tray 1 frees the tray 1 from the left and right sides of the film 3 of the film supply device 4 by the conveyor apparatus 2 is released. Even if transported to the transport position P 'coinciding with (P), the film 3 is still held firmly by the film guide part 5 above the tray 1 at this point, and the film 3 Since the electric strength of the tray 1 is less than that of the tray 1, even if the tray 1 is soft, it does not deform or crush.

That is, until the film 3 passes the transport position P ′ coinciding with the film release position P, the film 3 is sandwiched at both ends by the left and right film supply devices 4 and has a strong electric field force. In the present invention, the film guide portion 5 still holds the tray 1 upright, so that the strong electric field does not fall on the tray 1.

6 and 9, when the tray 1 is transported to the export side rather than the transport position P 'coinciding with the film release position P, the film electric field narrowing on both the left and right sides is released. When the film tensioning action of the film guide part 5 is transmitted to the tray 1 (in the embodiment described later, the film guide part 5 passes through the tip portion Q of the transport direction side of the film guide part 5). When the film 3 is sent and conveyed to the tray 1 while the state in which the film is held in tension is released, for example, the height of the film guide part 5 gradually decreases and the electric field strength becomes weak. The case where the tensioned state of the film 3 is conveyed to the tray 1 at a position equal to or lower than the height of the film 3), the left and right sides of the film 1 by the film supply device 4 are released. The force pushing down from the top of (1) is suppressed In the tray (1) film 3 with the top Booker ssuiwojyeo the film (3) with a tray (1) is transported.

Therefore, this invention protrudes the front end side Q of the transport direction side of the film guide part 5 rather than the film release position P to the transport direction side, and after the state which clamped the film 3 from the left and right was released, the said film is released. By transmitting the film-tightening action of the guide part 5 to the tray 1, the force which the strong electric field force of the film 3 pushes down from the upper side of the tray 1 to below is suppressed, and by this the tray Regardless of the type of (1), even the soft tray 1 can be transported and packaged.

In the present embodiment, the projecting degree is designed to be small so that the film 3 contacts the tray 1 immediately after the film is released, and the timing is delayed. It is constructed so that there is no outstanding wrinkle.

In this embodiment, the tip of the transport direction of the film guide portion 5 is set so as to slightly protrude toward the transport direction than the film release position P. However, the film width, the film material, the elongation of the film, etc. In consideration, the protruding position of the tip portion Q of the transport direction of the film guide 5 may be adjusted freely.

In addition, in this embodiment, the guide rim portion 5A of the film guide portion 5 is set to a position sufficiently higher than the rim portion 1A of the tray 1 until halfway, and the tip portion on the transport direction side is transported. It is gradually inclined downward toward the direction, and in the tip part Q, it is comprised so that it may become a height located only above the upper edge of the tray 1 only.

That is, the film 3 lengthened by the film supply device 4 is pulled out and transported while being held in a horizontal tension in the upper part of the tray 1 until the middle thereof, and gradually descends in the vicinity of the film release position P. And it goes down to the upper vicinity of the tray (1).

However, as described above, the tip Q of the guide rim portion 5A on the transport direction side of the tray 1 certainly protrudes toward the transport direction of the tray 1 rather than the film release position P. Until the film length is released by the feeder 4, the film tensioning action by the guide rim 5A is reliably maintained.

Moreover, since it can fully locate in the vicinity of the upper side of the tray 1, even if the said protrusion degree is a little, the timing does not become slow and can contact the film 3 to the tray 1 quickly after electric field release. Therefore, the film 1 can be covered so that strong electric field strength is not caught by the tray 1 and wrinkles are not produced as much as possible.

In addition, since the guide upper edge 5A of the film guide part 5 is installed at a high position in advance (up to the middle), even if the contents 8 protrude upward from the tray 1 (the contents 8 are Even if it touches the full length film 1), transportation and packaging are possible.

In this case, by providing the guide upper edge portion 5A of the film guide portion 5 on both sides of the tray 1 and the contents 8, the stress caused by the overall length of the film 3 is reduced to It can be received by the guide upper edge part 5A arrange | positioned at both sides, and this suppresses the action of the content 8 and the tray 1 being pushed down from the upper part downward to the electric field force of the film 3 The problem of crushing the soft contents 8 and the tray 1 can also be prevented.

In addition, in this embodiment, the roller part 6 which is rotatably installed is hung freely by the round lever-shaped endless belt 7 which is hardly injured by the film 3, and the film is attached to this endless belt 7 by the movement. The film guide part 5 is comprised so that (3) may be tightened and supported.

Therefore, the structure of the film guide part 5 becomes easy to be realized, and the movement of the film 3 becomes smooth, and the stretch packing machine which is very practical is excellent.

That is, even if the film 3 does not slide and transport on the guide upper edge 5A, the present embodiment is provided with an endless belt 7 spanning a roller or the like that functions as the guide upper edge 5A. According to the transportation movement, the endless belt 7 is sent by the action of friction, so that it can be transported smoothly without damaging the film 3.

Next, the film packaging process part (B) and the film cutting packaging completed process part (C) will be briefly described.

As described above, the tray 1 is transported from the conveyor apparatus 2 to the second conveyor apparatus 14 of the type sandwiched from side to side, while the height of the tip side of the transport direction side of the film supply apparatus 4 is lower than the tray transport position. The film side which has been released at the film release position P is transported by the sending roller 9, and the film side ends on the left and right sides of the tray 1 are overlapped with each other by the guide mechanism 13, respectively. It is guide | induced so that it may be laminated | stacked and wrapped the film 3 on the tray 1 in a cylindrical shape.

In this manner, the film 3 between the trays 1 is cut by the cutting device 15 descending between the film-packed trays 1, and the cut end is folded on the lower surface side of the tray 1. Doing.

Thus, the tray 1 which completed packaging is comprised so that it may carry out to the carrying out conveyor apparatus 16. As shown in FIG.

In the present invention, since the strong electric field force can be reliably prevented from being applied to the tray, not only a rigid tray as in the related art but also a soft tray may be used, and also in the method of putting the contents in the kind of the tray, The range of application becomes wider, and the versatility is improved, thereby improving the practicality of the device.

Claims (3)

A pair of film feeders for conveying and feeding the film to the left and right sides of the conveyor device for transporting the trays are disposed in a down-tilt toward the conveying direction of the tray, and the film feeder is provided inside the film feeder. A pair of film guides that stretch the stretched film on top of the conveyor device, transport the tray by the conveyor device to pass between the film guides, and release the film released from the film supply device. In the stretch packaging machine configured to cover the tray from the top, guide both ends of the film to the lower side of the tray, cover the film in a cylindrical shape, cut the front and rear films of the tray, and fold the film into the tray. Inserting the film of the film supply device in the electric field state on both left and right sides It is arranged so that the tip of the film-direction portion in the conveying direction is protruded in the tray conveying direction rather than the released film release position, and the full length film is conveyed by the conveyor apparatus to a conveying position that coincides with the film release position of the film supply device. In the tray having been configured, the film guide part is hung tightly on the upper side of the tray, so that the film is covered on the upper part of the tray after the tray is transported to the carrying out side than the transport position corresponding to the film release position. The stretch packing machine which features. The method of claim 1, At least a guide upper edge portion of the film guide portion in the transport direction side tip portion is formed to be inclined downward in the transport direction, and the height is increased to the conveyor apparatus at a transport position coinciding with the film release position of the inclined guide upper edge portion. A stretch wrapper, characterized in that set at a position higher than the upper border of the tray transported by. The method according to claim 1 or 2, A stretch packaging machine, characterized in that the film guide portion is configured to freely suspend the endless belt between the rotatable roller portions, and to hold the film tightly on the endless belt.