JPH0454081Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention provides a pair of rotary chains on both sides of a conveyor that horizontally transports items to be packaged so as to be inclined downward in the direction of conveying the items to be packaged. In a packaging machine in which both side edges of a stretchable film are held between a large number of clips provided on a chain, and the film is stretched in both directions by the rotation of the chain, the film is wound around the item to be packaged. The present invention relates to a film stretching and holding device for preventing film shrinkage that occurs when a clip is released from the film.

(Prior Art) For example, when wrapping trays containing fresh food with a film, the film is stretched to give it transparency.
An optimal packaging machine of this type is disclosed in the publication. The packaging machine disclosed in this publication supports both side edges of a strip-shaped film with a pair of endless chains, stretches it laterally and covers the tray, then releases the film from the chains, and at the same time places both side edges of the released film on the tray. A V-shaped guide element on the lower side draws them together into a cylindrical shape.
As a result, a tube-shaped film F is placed around the tray T as shown in FIG.

(Problem to be solved by the invention) However, in the above-mentioned packaging machine, the moment the both side edges of the film are released from the chain, the both side edges of the once stretched film contract instantaneously due to the elasticity inherent to the film. As a result, there was a drawback that the film became slack, and the edges S and S on both sides became tangled in a ball-like shape due to shrinkage, as shown in Figure 4.When this happens, the film loses its transparency and its sealing properties are also reduced. Deteriorate.

(Means for Solving the Problems) In view of the above points, the present invention aims to hold both side edges of the film so that they do not shrink even after they are released from the chain. In order to achieve this purpose, the packaged item A
On both sides of the horizontal conveyor 10 that carries and transports
a pair of endless chains 11, the rear ends of which are inclined downward in the direction of conveyance of the packaged items;
11, and its front end is connected to a chain foil 12,
13, and a large number of clips 16 are provided on these chains at equal intervals so as to be released by contacting cams provided concentrically with the front and rear chain wheels 12, 13. Clips 16 hold both edges of the film F, and the chain 11 rotates to move the film to the packaged object A.
At the same time, a pair of endless chain-like string belts 20 are supported above the rear ends of both chains 11 by pulleys 21 and 22 at the front and rear, and the pulley 22 at the rear end is moved horizontally and close to each other. Let me V
At the same time, both edges of the film released from the clip are pulled together by the string belts 20 on the lower surface of the packaged object, and the film F
In this packaging machine, a pair of rollers 17, 17 with smooth surfaces are installed immediately behind both chains 11 and below both string belts 20. The lower ends of the rollers are rotatably and vertically supported on the machine stand 19 so as to contact both side edges of the film from the outside, and the upper ends of both rollers 17 are respectively inwardly and slightly inclined in the film traveling direction. 1. A film stretching and holding device for a packaging machine, characterized in that it is installed in a packaging machine.

(Function) In the present invention, a pair of chains provided on both sides of a conveyor for conveying the packaged items sandwich a strip-shaped film with a large number of clips provided thereon, and transport the film in the same direction as the packaged items. While doing so, cover the item diagonally. Due to the inclination of both chains, the rear end of the chain is located below the conveyor, so that the film is relatively bent so as to be pushed up by the object to be packaged. The film is released from the clip in this state. However, both side edges of the film are in contact with the surfaces of a pair of rollers provided at the rear of the chain. Since this type of stretchable film is stretched, it becomes similar to sticking to a smooth object, so that each side edge of the film sticks to the surface of the roller to prevent its shrinking movement. be done. The upper ends of these pair of rollers are tilted inward to press the film, and the upper ends are also tilted in the direction in which the film travels, so as the rollers roll, both edges of the film are stretched downward. It can be done. Above the rollers, both side edges of the film are stretched by a V-shaped belt and overlapped with the underside of the packaged object.

(Example) In FIGS. 1 and 2, reference numeral 10 is a conveyor for carrying and transporting the packaged items A, and a pair of endless chains 11, 11 are provided on both sides of the conveyor 10, and chain foils 12 are attached to the front and rear ends of the conveyor 10, respectively. ,12,
It is supported and installed on 13.3. The chains 11, 11 are continuously rotated by placing the aforementioned chain foils 12, 13 at opposite ends of the elongated plate 14 and rotating the chain foils by means of an input applied to the bevel gear 15. Both chains 1
1 and 11 have a large number of clips 16 and 16, respectively.
... are provided at equal intervals, and the front chain foil 12,1
said clip 1 by means of a cam provided coaxially with clip 2.
By opening 6, 16..., both side edges of the film F are held between the clips 16, 16... one after another, and the clips 16, 16... are opened by a cam provided coaxially with the rear chain wheels 13, 13. Particularly, from said clips 16, 16...
will be released. As described above, the film F is conveyed by the chains 11, 11 in the same direction as the article A to be packaged conveyed by the conveyor 10, and is placed on the article A at an angle. In this case, the film F is pushed up by the object A and is stretched.

A pair of rollers 17, 17 are arranged vertically behind both chains 11, 11, and the bottom of the rollers is rotatably supported by a machine base 19 via a shaft 18. As shown, since the rollers 17, 17 are tilted inward, both edges of the film F released from the chain are pressed downward, and the rollers 17, 17 slide on their surfaces. Because the film is processed in such a way that it comes into close contact with both rollers. Furthermore, as shown in FIG. 2, since the upper ends of the rollers 17, 17 are inclined in the direction of conveyance of the film F, the film is pulled downward by the rolling of the rollers.

A pair of string-like belts 20, 20 are connected from above the rear ends of the chains 11, 11 to above the rollers 17, 17, and the pulleys 21, 21,
22, 22, and these string belts 20, 2
0 is arranged in a V-shape, and therefore, above the roller, both edges of the film F are pulled together by the string-like belts 20, 20, and are overlapped on the lower surface of the object to be packaged. At the same time, both side edges of the film are welded by a pair of rotating sealers 23, 23 provided behind the string belt.

(Effects) The present invention provides a pair of rollers 17, 17 behind the chains 11, 11 provided on both sides of the conveyor 10 for conveying the packaged material A, and rolls the both side edges of the film F released from the chains 11, 11. Since the film is made to adhere closely to the rollers 17, 17 by utilizing the property that it exhibits a state similar to that of adhesion to other smooth objects, the clips 16, 1 are attached at the rear end of the chain.
It is possible to prevent the shrinkage of the film immediately after it is released from the rolls 17, 17, and to pull the film further downward by tilting the rolls 17, 17 backwards. It has the effect of being able to be wrapped around packages.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a side view of the previous figure, and Fig. 3 is a -
The perspective view, FIG. 4, is a bottom inclined view of the packaged product. 10... Conveyor, 11... Chain, 16...
Clip, 17...roller, 20...string belt, A...wrapping object, F...film.

Claims (1)

[Scope of utility model registration request] Horizontal conveyor 1 that carries the packaged item A
A pair of endless chains 11, 11 are installed on both sides of the package 0 so that the rear ends thereof are inclined downward in the conveying direction of the packaged items, and the front and rear ends thereof are supported by chain foils 12, 13, respectively. ,
A large number of clips 16 are placed on these chains at equal intervals.
The clips 16 are provided so as to be released by coming into contact with cams provided concentrically with the front and rear chain foils 12 and 13, and these clips 16 hold both edges of the film F, and the rotation of the chain 11 causes the film to be released. While the object to be packaged A is being transported in the same direction, a pair of endless chain-like string belts 20 are placed above the rear ends of both chains 11, and each of the belts 20 is supported by pulleys 21 and 22 at the front and back, so that the belts are horizontal and at the rear ends. Pulley 22
are placed close to each other in a V-shape, and the string belts 20 pull both edges of the film released from the clips onto the underside of the object to be wrapped, and the film F is placed around the object A to be wrapped. In a wrapping machine configured to wrap the film, a pair of rollers 17, 17 with smooth surfaces are placed directly behind both chains 11 and below both string-like belts 20, and are brought into contact with both side edges of the film from the outside. The lower ends of the rollers are rotatably and vertically supported on the machine base 19, and the upper ends of both rollers 17 are installed on the inside and slightly inclined in the direction of film travel. Film stretching and holding device in packaging machines.