JPS63272614A - Packing machine - Google Patents

Abstract

PURPOSE:To pack an object to be packed having a large longitudinal width, by constituting a film end fixing apparatus so that a stretched film is fixed at several kinds of strengths on the end part side thereof and making it possible to pull out the film when the object to be packed is pushed up against the film and making it impossible to pull out the film when the film is folded in. CONSTITUTION:One of the motors is operated to grasp the end part of a film 7 between upper and lower stopper members 18, 18A by force possible to pull out the film and, next, a receiving table 5 is raised by a lift to push up the film 7 from below to stretch the same. In this case, the film 7 is pulled out from the gap between the upper and lower stopper members 18, 18A to hold proper pressure. Next, the other motor is also operated to grasp the end part of the film 7 between the upper and lower stopper members 18, 18A in a state impossible to pull out the film 7 and, in this state, the operation turning in the edge parts of the film 7 from three sides is performed. In this case, since the end part of the film 7 is fixed in the state impossible to pull out the film at the time of the operation, good packing can be performed in such a state that the film 7 generates no slackening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the use of stretchable plastic films such as polyvinylidene chloride, so-called stretch films, for packaging objects, especially foodstuffs and other products placed in trays or other containers. The product is wrapped in a packaging machine.

[Prior Art] Generally, as a packaging machine using stretch film, the wrapping machine pushes up the packaged object supplied to the pedestal toward the film which is supplied to the packaging unit and stretched, and the film end is fixed. Tokko Showa is a method in which the object to be packaged is pressed against the film, the film is held under tension, the film is folded under the object by a folding tool, and then the wrapped object is transported out. 55-4
This is proposed in Publication No. 8015.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the plurality of clamp plates that open and open the ends of the film supplied to the packaging unit device by cylinders are so strong that the film cannot be pulled out. It is configured to be clamped and fixed.

By the way, when packaging an object that has a height dimension, that is, the depth of the tray, such as a tray for storing wetlands, and is made up of the tray and the packaged object, the tray is supplied to the packaging unit as in the past. If the edge of the film is fixed with a clamp plate with such force that the film cannot be pulled out, and the object to be packaged that has been supplied to the pedestal is pressed against the film in this state, it will cause stress to both the film and the object to be packaged. There is a problem in that pressure is applied and problems such as damage to the tray or cutting of the film are likely to occur.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a packaging machine that is well adapted to packaging objects having a high height dimension and can be packaged without damaging the tray or cutting the film.

[Means for Solving the Problems] The present invention is a packaging machine in which a film end fixing device is configured to fix the end side of a stretch film with a plurality of strengths.

[Function] In the present invention, the film end fixing device fixes the film end side in a state where it can be pulled out, and then the object to be packaged is pressed against the film via the pedestal, and then the film end fixing device prevents the film from being pulled out. The film is folded in a state where the film edges are fixed as much as possible. Therefore, when the object to be packaged is pressed against the film, the film can be pulled out according to the vertical width of the object to be packaged, and the pressure between the film and the object to be packaged is maintained appropriately. On the other hand, when the film is folded in, the end side of the film is fixed in a state where it cannot be pulled out, so the film is folded well without loosening.

[Example] Figures 4 and 5 show an overview of the overall configuration of a stretch film wrapping machine, and the front side of the main body frame 1 has a structure extending to the lower part of the wrapping section 2, which is approximately the middle part of the main frame 1. A packaged article supply device A is provided which includes a conveyor 4 for transporting the packaged articles 3.

At the supply end of the conveyor 4, there is disposed a pedestal 5 on which the objects 3 to be packaged are fed and placed by the conveyor 4. , forms a pedestal lifting device B that stretches and holds the stretch film when the pedestal 5 is raised.

A roll body 8 in which a stretch film 7 is wound into a roll shape is rotatably held on the rear side of the main body frame 1, and both ends of the stretch film 7 pulled out from the roll body 8 are connected to a pair of upper and lower endless ends. A film feeding device C that is inserted into the shaped belt 9 and transported to the packaging section 2 position is disposed on both sides of the upper part of the main body frame 1 in the front-rear direction. A film cutting device includes a cutter 10 that makes perforations in the width direction of the stretch film 7 at the end of the endless belt 9 on the insertion side of the stretch film 7, and a film folding device 11 provided on both sides of the cutter 10. There are restrictions.

The packaging portion 21!11 of the main body frame 1 has a rear folding body 12 that reciprocates along the length direction of the film 7 and the film 7.
Left and right folding bodies 13 that can be opened and closed mutually along the width direction are provided, and as each folding body 12 and 13 moves, the film 7 is cut from the perforation position and pushed up by the pedestal lifting device B. A film folding device E for folding the film 7 onto the bottom surface of the packaged object 3 is provided.

On the upper side of the main body frame 1, there is a carry-out member 14 that moves forward in contact with the top surface of the package 3A, and a heater 15A that tightly contacts the film 7 at the bottom of the package 3A while placing and carrying out the package 3A. A carry-out device 11iF is provided which includes a carry-out belt 15 and a transfer conveyor 16.

The packaged items 3 such as trays containing products are shown in Figure 6 <A) (B)
As shown, the conveyor 4 of the packaged article supply device 1fA transports the packaged articles from the front side of the main body frame 1 to the lower part of the packaging section 2, which is approximately in the middle, and supplies the packaged articles to the receiving table 5. At the same time as this packaged object 3 is transferred, the roll body 8 is
The stretched film 7 is transferred from the rear side of the main body frame 1 toward the packaging section 2 while being sandwiched between a pair of upper and lower endless belts 9, and during the transfer, it is cut by a cutter 10 of a film cutting device. The series of stretch films 7 on which perforations 11 are formed and perforations 17 are formed as shown in FIG. 6 (A>(B)) are further transported to the packaging section 2 position. In this case, the end of the film 7 is attached to the stopper members 18 and 18 of the pair of film end fixing devices G at the lower part of the delivery belt 15.
Fixed by A.

In this way, as shown in FIG. 6(B), the article to be packaged 3 is supplied onto the pedestal 5, and a series of stretch films 7 with perforations 17 are supplied to the packaging section 2, and the ends thereof are In the state where it is fixed by the stopper member 18.18A of the film end fixing device G, the pedestal 5 is raised by the lift 6 of the pedestal lifting device B to the packaging section 2 position as shown in FIGS. 6(C) and 6(D). The supplied film 7 is pushed up from below and stretched, and then the rear folding body 12 and the left and right folding bodies 13 slide along the bottom surface of the pushed up object 3 to form perforations 17.
Then, the edges of the film 7 are folded in from three sides. Then the end of the film 7 is moved to the stopper member 18.1.
8A and is sent by the carry-out member 14 onto the carry-out belt 15 heated by the heater 15A,
Due to this transfer, the front edge of the film 7 released from the stopper member 18.18A is folded into the lower surface of the tray 19,
Next, it is carried out while being closely attached by the heat of the carry-out belt 15, and transferred by the transfer conveyor 1G. Although the conveyance belt 15 is shown as being formed so as to surround a heating plate having a built-in heater 15A, a sheathed heater may be incorporated in the conveyance belt 15 itself, and the heating means thereof may be appropriately selected.

In the packaging machine, as shown in FIGS. 1 to 3, in the film end fixing device G, the upper stopper member 18 is fixed between the left and right side plates of the main body frame 1, and the base end of the lower stopper member 18A is fixed. It is fixed to a rotating shaft 20 passed between the left and right side plates of the main body frame 1, and one end of a link arm 21.22 is fixed to each side of the rotating shaft 20, and the other end of the link arm 21.22 is fixedly mounted. Elongated holes 23.24 are provided with drive shafts 25 of motors 25.26.
A, Short with the proximal end fixed to 26A.

The distal end of a long operating arm 27, 28 is engaged via a roller 29, 30. and one motor 2
5, the short actuation arm 27 rotates by a predetermined angle, and the link arm 21 rotates through the engagement between the roller 29 and the elongated hole 23.
rotates, and the link arm 2 is integrated with the link arm 21.
2 and the rotating shaft 20 rotate, the lower stopper member 18A rotates toward the upper stopper member 18 using the rotating shaft 20 as a fulcrum, and abuts against each other, and the end side of the stretch film 7 is held between the upper and lower stopper members 18 and 18A. to pinch. In this case, the stretch film 7 is sandwiched between the upper stopper member 18 and the elastic member 31 provided on the lower stopper member 18A. In this state, since torque is applied only to one end of the laterally long lower stopper member 18A, the stretch film 7 is clamped with a force strong enough to be pulled out. Next, when the other motor 26 is operated, the long operating arm 2
8 rotates at the same angle as the motor 25, and the link arm 22
further rotates to apply torque from both ends of the lower stopper member 18A, and the stretch film 7 is clamped with such force that it cannot be pulled out.

Since the film end fixing device WIG is configured as described above, when the object to be packaged 3 is fed onto the pedestal 5 and a series of stretch films 7 with perforations 17 are fed to the packaging section 2, First, one motor 25 is operated to clamp the film 7 end side between the upper and lower stopper members 18 and 18A with enough force to allow it to be pulled out, and then the pedestal 5 is raised by the lift 6 and the film 7 is lowered. Push up and stretch. In this case, the tray 19, which has a large height, pushes up the film 7, but due to this pushing up, the film 7 is pulled out from between the upper and lower stopper members 18, 18A, and an appropriate pressure is maintained, so there is no risk of damaging the tray 19 or preventing the film from being damaged. 7 can be prevented from being cut. Next, the other motor 26 is also activated.

The end side of the film 7 is sandwiched between the lower stopper members 18 and 18A in such a manner that it cannot be pulled out, and in this state, the rear folding body 12 and the left and right folding bodies 13 slide along the bottom surface of the article to be packaged 3, and the sewing machine The edge of the film 7 is folded in from three sides after being separated from the eye 17. When the film 7 is folded in properly, the motors 25 and 26 are operated to return the lower stopper member 18△ and pinch the film 7. Unlock.

In this case, during the film folding operation, the end side of the film 7 is fixed so that it cannot be pulled out, so the film 7 can be packaged well without loosening, and when the predetermined amount of folding is completed, the film 7 can be pinched. Just cancel it.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible within the scope of the invention. For example, in a film end fixing device, the stopper member is rotated by a motor and a link arm, but the motor and the rotating shaft of the stopper member may be connected by a belt, a boob, etc., or the stopper member is rotated by a cylinder device. You may move it.

Furthermore, although the two motors are used to apply the strength of the film clamping force, the strength of the film clamping force may be varied by varying the torque of one motor in two stages. In addition, the overall configuration of the packaging machine was
-35578, which clamps and feeds the film, or Utility Model No. 55-47992, Japanese Patent Publication No. 56
-344848 film folding device, etc. can be modified as appropriate.

[Effect of the invention 1] The present invention uses the film end fixing device to fix the end side of the stretch film with the strength of the throw, and allows the film to be pulled out when pushing up the packaged object against the film. Accordingly, it is possible to provide a packaging machine that can wrap objects with a large vertical width by making it impossible to pull out the film when folding the film.

[Brief explanation of drawings]

Figures 1 to 6 show a practical example of the present invention, Figures 1 to 3 are sectional views of the operating state, Figure 4 is a vertical sectional view of the entire packaging machine, and Figure 5 is the same plane. Figure, Figure 6 (A) (B) (C)
(D) is a working state diagram showing the packaging state. 2... Packaging ff13... Wrapping object 3A... Wrapping object 7... Stretch film A.
・・Packaged material supply device B・Passage lifting device C・・Film supply device D・・Film cutting device E・・Film folding device F・・Carrying out device G・・Film end fixing Applicant for device patent: Nippon Seiso Co., Ltd.
people patent attorney cow tree
Protection (A) 6th (B) (D) Fig.

Claims (1)

[Claims] A film supply device that supplies a stretch film to a packaging section position, and a film end fixing device that fixes the end side of the stretch film supplied to the packaging section position by the film supply device with a plurality of strengths. a device, and a pedestal lifting device that is provided below the packaging unit position so as to be movable up and down, and that raises and lowers a pedestal on which an object to be packaged is placed while the film is fixed with a strength that allows the film to be pulled out by the film end fixing device. a packaged object supplying device that supplies the packaged object onto the pedestal of the pedestal lifting device; A film folding device that folds the film in a state in which the film is fixed with a strength that cannot be pulled out by a fixing device, and a carrying-out device that carries out the packaged item with the stretch film folded by the film folding device. Characteristic packaging machine.