JPH057248B2 - - Google Patents

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 stretchable plastic films, such as polyvinylidene chloride. This invention relates to a packaging machine that wraps with film.

[Prior Art] Generally, a wrapping machine using a stretch film is used to push up an object to be packaged, which is supplied to a pedestal, toward a film which is supplied to a wrapping section position, is stretched, and has a fixed film end. In particular, there 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. Kosho 55-
This is proposed in Publication No. 48015.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the ends of the film supplied to the packaging section are narrowed by a plurality of clamp plates that are opened and closed by cylinders to such a degree that the film cannot be pulled out. It is configured to be attached and fixed.

By the way, when packaging an object consisting of a tray that has a height dimension, that is, a depth, such as a tray for storing a wetland, and a packaged object, the tray is not supplied to the packaging section position 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 was a problem in that the excessive pressure applied could easily cause malfunctions such as damage to the tray or cutting of the film.

Accordingly, the present invention provides a packaging machine that is well suited for packaging items with high dimensions and can be packaged without damaging the tray or cutting the film.

[Means for Solving the Problems] The present invention provides a film supply device that supplies a stretch film to a packaging section position, and a front end side of the stretch film supplied to the packaging section position by the film supply device. , a film end fixing device having a pair of stopper members that can be pinched together by opening and closing operations, and a film end fixing device that pinches the end side with a plurality of strengths by these stopper members; When a tensile force of more than a predetermined value is applied to the film, the film end fixing device narrows the end of the film to a strength that allows it to be gradually pulled out, and then the cradle on which the packaged item is placed is held. A pedestal elevating device that rises, a packaged object supplying device that supplies the packaged object on the pedestal of the pedestal elevating device, and a lower side of the packaged object transferred to the packaging unit position by raising the pedestal. and a film folding device that folds the rear side and both left and right sides of the film while the film end side is narrowed and fixed with such strength that the film cannot be pulled out by the film end fixing device, and the stretch film is released from being pinched. This packaging machine is equipped with an unloading device that unloads the packaged item to the front side of the film supply side in a state in which the packaged item is unwrapped.

[Function] In the present invention, the film end fixing device presses the packaged item against the film through the cradle with the film end narrowed in a state where it can be pulled out, and then the film end fixing device presses the packaged item against the film in a state where it cannot be pulled out. In this state, the film is folded while the end side of the film is narrowed and fixed. 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 tightly fixed in a state where it cannot be pulled out, so that the film is folded well without loosening.

[Example] FIGS. 4 and 5 show an overview of the overall configuration of a stretch film wrapping machine. On the front side of the main body frame 1, there is a lower part of the wrapping section 2, which is approximately in the middle of the main body frame 1. A packaged article supply device A is provided which includes a conveyor 4 for transporting the packaged articles 3 up to the point where the packaged articles 3 are transported.

At the supply side end of the conveyor 4, a pedestal 5 is disposed on which the objects 3 to be packaged are fed and placed by the conveyor 4, and this pedestal 5 is connected to a lift 6 which is moved up and down by a drive section as appropriate. , and 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 ends. A film feeding device C is disposed on both sides of the upper part of the main body frame 1 in the front-rear direction for transporting the film to the packaging section 2 by being sandwiched between the endless belts 9. At the end of the endless belt 9 on the side where the stretch film 7 is inserted, there is a film cut consisting of a cutter 10 for perforating the stretch film 7 in the width direction, and a film presser 11 provided on both sides of the cutter 10. A device D is provided.

A rear folding body 12 that reciprocates along the length direction of the film 7 and left and right folding bodies 13 that can be opened and closed mutually along the width direction of the film 7 are provided on the packaging section 2 side of the main body frame 1. A film folding device E is provided which cuts the film 7 from the perforation position as the bodies 12 and 13 move and folds the film 7 onto the bottom surface of the packaged object 3 pushed up by the pedestal lifting device B. There is.

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 F is provided which includes a carry-out belt 15 with a conveyor belt 15 and a transfer conveyor 16.

The packaged items 3 such as trays containing products are shown in Figure 6A,
As shown in FIG. 1B, the conveyor 4 of the packaged article supply device A transports the packaged articles from the front side of the main body frame 1 to the lower part of the packaging section 2 at an approximately middle portion, and supplies the packaged articles to the pedestal 5. At the same time as the object to be packaged 3 is transferred, the stretch film 7 is pulled out from the roll body 8 by the film supply device C and is sandwiched between a pair of upper and lower endless belts 9 from the rear side of the main body frame 1 toward the packaging section 2 position. During the transfer, perforations 17 are formed by the cutter 10 of the film cutting device D. In this way, a series of stretch films 7 with perforations 17 formed as shown in FIGS. 6A and 6B are It is further transported to the packaging section 2 position. In this case, the end of the film 7 is fixed at a position below the delivery belt 15 by the stopper members 18, 18A of the pair of film end fixing devices G.

In this way, as shown in FIG. 6B, 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 fixed by the stopper members 18 and 18A of the end fixing device G, the pedestal 5 is raised by the lift 6 of the pedestal lifting device B and fed to the packaging section 2 position as shown in FIGS. 6C and D. The 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 be separated from the perforation 17, and the edge of the film 7 is Fold in from three sides. Thereafter, the end of the film 7 is released from the stopper members 18, 18A and is sent by the delivery member 14 onto the delivery belt 15 heated by the heater 15A.
The front edge of the tray 19 is folded into the lower surface of the tray 19, and then the tray 19 is carried out while being closely attached to the heat of the carry-out belt 15, and transferred by the transfer conveyor 16. 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 link arms 21 and 22 is fixed to each side of the rotating shaft 20, and the other end of the link arms 21 and 22 is Elongated holes 23 and 24 are provided, and in the elongated holes 23 and 24, short and long operating arms 27 and 28 whose base ends are fixed to drive shafts 25A and 26A of motors 25 and 26 have rollers 29 and 30 at their tips. It is constructed by intervening through. When one motor 25 is activated, the short actuation arm 27 rotates by a predetermined angle, and the link arm 21 rotates through engagement between the roller 29 and the elongated hole 23.
The link arm 22 and rotating shaft 20, which are integral with each other, rotate, and the lower stopper member 18A rotates toward the upper stopper member 18 using the rotating shaft 20 as a fulcrum, and in this way, the upper and lower stopper members 18, 18A open and close. When closed, the ends of the stretch film 7 are narrowed between the upper and lower stopper members 18, 18A by abutting against each other. In this case, the stretch film 7 is squeezed 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 squeezed with enough force to allow it to be pulled out. Next, the other motor 26
When the motor 25 is operated, the long operating arm 28
The link arm 22 rotates further to apply torque from both ends of the lower stopper member 18A, and the stretch film 7 is clamped and fixed with such force that it cannot be pulled out.

Since the film end fixing device G is configured as described above, the object 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. First, one motor 25 is activated to move the upper and lower stopper members 18,1.
8A, the end side of the film 7 is squeezed with a force that allows it to be pulled out, and then the pedestal 5 is raised by the lift 6, and the film 7 is pushed up from below and stretched. In this case, the tray 19 having a large height pushes up the film 7, but this pushing up causes the film 7 to
is pulled out from between the upper and lower stopper members 18 and 18A, and an appropriate pressure is maintained, thereby preventing damage to the tray 19 or cutting of the film 7. Next, the other motor 26 is also operated to clamp and fix the end of the film 7 between the upper and lower stopper members 18 and 18A so that it cannot be pulled out.
In this state, the rear folding body 12 and the left and right folding bodies 13 slide along the bottom surface of the packaged object 3, cut it off from the perforation 17, and fold in the edges of the film 7 from three sides, thereby folding the film 7 appropriately. Once activated, the motors 25 and 26 are activated to return the lower stopper member 18A and release the film 7 from being pinched. 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 the pinching of the film 7 is released when the predetermined amount of folding is completed. do it.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present 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 pulley, etc., or the stopper member is moved by a cylinder device. You may let them. Furthermore, although 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, as the overall configuration of the packaging machine,
A device that clamps and feeds the film like No. 35578, or Utility Model No. 47992 (1983), and Special Publication No. 56 (1983).
The film folding device of No. 34484 can be modified as appropriate.

[Effects of the Invention] The present invention includes a film supply device that supplies a stretch film to a packaging section position, and a method for narrowing the end side of the stretch film supplied to the packaging section position by the film supply device by an opening/closing operation. A film end fixing device is provided which is movable up and down below the packaging portion position, and is provided with a film end fixing device that is movable up and down below the packaging portion position and is provided with a film end fixing device that narrows the end portion side with a plurality of strengths using these stopper members. When the above tensile force is applied, the pedestal lifting device raises the pedestal on which the object to be packaged is placed while the film end fixing device narrows the end side of the film to a strength that allows it to be gradually pulled out. and a packaged article supply device that supplies the packaged articles on the pedestal of the pedestal elevating device, and a film end fixing device attached to the underside of the packaged article transferred to the packaging unit position by the raising of the pedestal. A film folding device that folds the film in a state in which the end side of the film is narrowed and fixed with such a strength that it cannot be pulled out; and a carry-out device that carries out the packaged item into which the stretch film has been folded by the film folding device. To provide a packaging machine that is capable of wrapping a large vertically wide object by making it possible to pull out the film when pushing the object up against the film, and making it impossible to pull out the film when folding the film. can do.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figures 1 to 3 are sectional views of the operating state, Figure 4 is a longitudinal sectional view of the entire packaging machine, Figure 5 is a plan view of the same, and Figure 6 is a longitudinal sectional view of the entire packaging machine.
Figures A, B, C, and D are operation state diagrams showing the packaging state. 2... Packaging department, 3... Item to be packaged, 3A... Packaged item, 7... Stretch film, 18, 18A...
...stopper member, A...packaged object supply device, B...
...Base lifting device, C...Film supply device, D...
...Film cutting device, E...Film folding device,
F...Export device.

Claims (1)

[Claims] 1 A film supply device that supplies a stretch film to a packaging section position, and a pair of stoppers that can pinch the front end side of the stretch film supplied to the packaging section position by the film supply device by an opening/closing operation. a film end fixing device which is provided to be movable up and down below the packaging section position and which applies a tensile force of more than a predetermined value to the film; a pedestal elevating device for raising a pedestal on which an object to be packaged is placed with the end portion of the film narrowed by the film end fixing device to a strength that allows the film to be gradually pulled out; A packaged article supply device supplies the packaged article on the pedestal of the device, and the film end fixing device fixes the end of the film on the underside of the packaged article transferred to the packaging unit position by raising the pedestal. A film folding device that folds the rear side and both left and right sides of the film while the sides are tightly tightened and fixed so that it cannot be pulled out, and the packaged item with the stretch film released is transferred to the front side of the film supply. A packaging machine characterized by comprising a carrying-out device for carrying out carrying out.