JP2904771B1 - Shrink film hem cut system and rotary table / lifter - Google Patents

Abstract

A rotary table lifter capable of automatically removing a skirt portion of a shrink film and used in the system is provided. SOLUTION: In a cutting system for a skirt portion of a shrink film in which products stacked on a pallet 3 are covered together with the pallet, a first cut in which a shrink film covering a back surface of the pallet 3 is vertically cut from a side surface to a back surface of the pallet. Means 27 and this first cutting means 2
A second cutting means 31 for cutting at least one circumference of the pallet in the circumferential direction of the pallet starting from the portion cut in 7 and a shrink film covering the back surface of the pallet separated by the first and second cutting means And a suction means 35 for sucking and removing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink film skirt cut system in which products stacked on a pallet are covered together with the pallet, and a rotary table lifter having a structure suitable for the system.

[0002]

2. Description of the Related Art In general, a palletized product having a shrink film covered from above is placed on a lifter, and the lifter is raised and the oven is lowered. In the oven, the shrink film applied to the product is heated by the heat. There is known a film packaging apparatus for adding heat and shrinking the film. With this kind of thing, when the oven descends, the heat of the oven acts on the shrink film and starts shrinking, so the skirt of the film gradually rolls up,
When the film is completely shrunk, there is a possibility that the hem does not reach the peripheral edge of the pallet, and there is a gap between the two, so that complete packaging cannot be performed. In order to solve this, conventionally, the length of the shrink film is set to be long beforehand in consideration of the heat shrinkage at the start of the descent of the oven.

[0003]

However, in the conventional configuration, since the length of the shrink film is set to be long in advance, when the skirt of the film wraps around the back surface of the pallet at the time of packaging and the film is torn at the time of unpacking, However, there is a problem that it is particularly difficult to remove the shrink film wound around the back surface of the pallet.

[0004] In order to solve this problem, an automatic cutting system for the skirt of the shrink film has been proposed. For example, when a configuration is used in which the skirt of the shrink film is cut off by cutter means while rotating the pallet, the pallet is cut off. After the pallet has to be rotated after being raised to the correct position, no turntable lifter designed for such purpose has yet been proposed.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to automatically remove a skirt of a shrink film, and to provide a rotary table lifter which is advantageously used in this system. To provide.

[0006]

According to one aspect of the present invention, there is provided a cutting system for cutting a skirt portion of a shrink film in which products stacked on a pallet are covered together with the pallet. First cutting means for vertically cutting the shrink film covering the back surface of the pallet from the side surface to the back surface of the pallet, and at least one round of the side surface of the pallet in the circumferential direction of the pallet starting from the portion cut by the first cutting device. It is characterized by comprising a second cutting means for tearing and a suction means for sucking and removing a shrink film covering the back surface of the pallet separated by the first and second cutting means.

According to a second aspect of the present invention, in the first aspect, a transport conveyor for transporting a pallet;
A rotary table lifter that is provided in the middle of the transport conveyor, lifts the pallet higher than the transport conveyor, and rotates the pallet when the shrink film is torn by the second cutting means. A rotary table that is lifted and lowered via a screw that is driven to rotate by a motor, an air cylinder that is connected to the rotary table and supports the total weight of the rotary table and the stacked products, and a driving unit that drives the rotary table to rotate And characterized in that:

According to a third aspect of the present invention, there is provided a rotary table which is lifted and lowered via a screw which is driven to rotate by a motor, and an air which is connected to the rotary table and supports the total weight of the rotary table and the stacked products. It is characterized by comprising a cylinder and driving means for driving the rotary table to rotate.

According to a fourth aspect of the present invention, in the third aspect, the rotary table includes an elevating plate that is raised and lowered via a screw, and a rotary plate that is rotationally driven by driving means. The rotating plate includes a plurality of rollers that roll on a lifting plate while drawing circular trajectories having different diameters.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a shrink film. This shrink film 1 has a hem 1
a is in the shape of an open bag, and is covered on a product 5 such as a glass bottle stacked on a plastic (or wooden) pallet 3. Here, the length of the shrink film 1 is cut to a length such that the tip of the skirt 1a reaches the back surface 3b of the pallet 3 beyond the peripheral edge 3a of the pallet 3 with the shrink film 1 covered on the product 5. I have.

The products 5 stacked on three pallets are placed on the lifter 7 with the shrink film 1 covered. The lifter 7 is raised, and at the same time, the oven 9 is lowered. Then, the shrink film 1 is shrunk by heat in the oven 9, and the product 5 is packaged as shown in FIG. The packaged products 5 are unloaded together with the pallets 3, shipped from the factory, and carried to a predetermined place.

At the destination, the shrink film 1 of the packaged product is peeled off, and the product 5 is taken out. The problem here is the shrink film 1A wound on the back surface 3b of the pallet 3. When it is wrapped around the back surface 3b, it becomes difficult to peel the shrink film 1A, and workability deteriorates.

In this embodiment, the shrink film 1 wrapped around the back surface 3b of the pallet 3 before shipment from the factory
A is removed by the cutting system 100.

As shown in FIG. 3, the cutting system 100 includes a transport conveyor 25 including a vertical feed conveyor 21 and a horizontal feed conveyor 23. Vertical feed conveyor 21
Is provided with a first cutting means 27. The first cutting means 27 includes a cutter 27a, as shown in FIG. 4, and the cutter 27a is normally urged to a standing position A by a spring (not shown). When the pallet 3 conveyed by the vertical feed conveyor 21 reaches the position of the first cutting means 27, the cutter 27a first hits the starting point a of the shrink film 1 corresponding to the side surface 3a of the pallet 3, and the film at the starting point a Sever. When the pallet 3 is conveyed in the direction of arrow X, the cutter 27a is pushed back to the tilting position B against the spring force, during which the cutter 27a is moved from the starting point a to the shrink film 1 corresponding to the back surface 3b of the pallet 3. The shrink films 1 and 1A are cut vertically to the end point b. The cutter 27a of the first cutting means 27 is rotatably attached to the tip of a swing arm 27b via a pin 27c, and the swing arm 27b moves from a standing position A to a tilt position B via a base pin 27d. Rocks. In order to swing the arm 27b, for example, an air cylinder (not shown) or the like may be employed.

Next, the pallet 3 is transferred from the vertical conveyor 21 to the horizontal conveyor 23 as shown in FIG. A rotary table lifter 29 and a second cutting means 31 are provided in the middle of the horizontal feed conveyor 23. After the rotary table lifter 29 pushes the pallet 3 higher than the vertical feed conveyor 21, the pallet 3 is rotated in the direction of arrow C at that position.

The second cutting means 31 includes a cutter 31a. The cutter 31a is supported by an arm 31b. When the arm 31b is moved by the air cylinder 31c, the cutter 31a is cut by the first cutting means 27. This corresponds to the starting point a of the shrink film 1. The position of the cutter 31a does not move, and the pallet 3 is rotated in the direction of arrow C as described above. In this case, if the pressure of the air cylinder 31c is appropriately set, the air cylinder 31c can be pushed away on the peripheral surface of the pallet 3.
When the peripheral surface of the pallet 3 escapes from the cutter 31a, the cutter 31a is pressed against the peripheral surface by the pressure of the air cylinder 31c. According to this, the cutter 31a is mounted on the pallet 3
The shrink film 1 is laterally cut along at least one circumference of the side surface 3a of the pallet 3 in the circumferential direction of the pallet 3 with the starting point a as a starting point.

According to this, the shrink film 1A wound on the back surface 3b of the pallet 3 is connected to the first cutting means 2
After being cut vertically from the starting point a to the end point b at 7, the second cutting means 31 starts to cut the starting point a as a starting point and at least the side surface 3 a of the pallet is cut laterally so that it is wound around the back surface 3 b. The shrink film 1A is cut off from the remaining shrink film 1.

The separated shrink film 1A
Is sucked and removed by the suction means 35. The suction means 35 includes a vacuum tank 35a, a hose 35b, and a suction port 35c.
Is arranged in the vicinity of. When the cutter 31a hits the starting point a of the shrink film 1, the suction means 35 starts operating, the suction of the film 1 into the vacuum tank 35a via the hose 35b is started, and the cutter 31a extends over the entire circumference of the side surface 3a of the pallet. As a result, all the cut shrink film 1 is sucked and removed.

The operation of the suction means 35 ends when the film cutting by the cutter 31a of the second cutting means 31 ends.

After the rotary table lifter 29 pushes the pallet 3 higher than the vertical feed conveyor 21, the pallet 3 is rotated in the direction of arrow C at that position, but this pallet 3 is not rotated almost exactly in the horizontal plane. When cutting with the cutter 31a and starting to cut sideways from the starting point a of the shrink film 1 and cutting along the entire circumference of the side surface 3a of the pallet, the cutter 31a may not return to the starting point a of the shrink film 1 accurately. is there. In this case, since the shrink film 1A wound on the back surface 3b is not completely separated from the remaining shrink film 1, suction and removal by the suction means 35 becomes difficult.

According to this embodiment, as shown in FIGS. 5 and 6, the rotary table lifter 29 is modified.

Reference numeral 40 denotes a base, on which four air cylinders 61 are fixed. The cylinder rod 61a of these air cylinders 61
An elevating plate 51 is fixed to the end of the pallet 3. On the elevating plate 51, a pallet 3 on which products are stacked as described later (FIG. 2)
Is placed. With only the four air cylinders 61, the elevating plate 51 can be raised for each pallet 3 on which the product is loaded. According to this embodiment, in addition to the four air cylinders 61, the horizontal table of the rotary table is provided. To maintain the degree, another lifting mechanism is provided.

This other lifting mechanism has a motor 41 fixed to a base 40. Output shaft 4 of this motor 41
A sprocket 42 is fixed to 1a, and a chain 43 is wound around the sprocket 42. The chain 43 is wound around a plurality of sprockets 45, and a boss 45a of each sprocket 45 has a screw shaft 4 formed of a square screw.
7 is screwed. The lower end 47a of each screw shaft 47 is screwed into the holder 49, and the upper end 47b of each screw shaft 47 is connected to the lifting plate 51.

A plurality of rollers 52 arranged on concentric circles having different diameters are fixed on the upper surface of the elevating plate 51, and a rotating plate 53 is installed on the rollers 52 so as to roll freely. The rotary plate 53 and the elevating plate 51 constitute a rotary table. A rotating shaft 55 is fixed to the rotating plate 53. The rotating shaft 55 extends downward, and its lower end is connected to a drive motor 57 for driving a rotary table shown in FIG. 5 via a clutch (not shown). Have been.

Referring to FIG. 3, when the pallet 3 moves on the rotary table lifter 29, a limit switch (not shown) operates, and first, air is supplied to the air cylinder 61 shown in FIGS. At the same time, the motor 41 is driven and the elevating plate 51 rises. Accordingly, the rotating plate 53 rises together.

In this case, when the clutch (not shown) is disengaged and the connection between the rotary shaft 55 and the drive motor 57 is temporarily released, and when the rotation of the rotary plate 53 is completed, the rotary shaft 55
And the drive motor 57 are connected again.

Next, when the rotation of the rotating plate 53 is completed,
The drive motor 57 is driven, the rotating shaft 55 is rotated, and the rotating plate 53 is rotated.

When lowering the rotary plate 53, the motor 41 is rotated in the reverse direction. However, no air is supplied to the air cylinder 61 and the air is not removed, and the air cylinder 61 is lowered while the total weight is supported.

According to this embodiment, the amount of air consumption is extremely small, and the balance with the product weight can be maintained, so that the load on the motor 41 is reduced. Followability can be improved.

Further, the lifting plate 51 can be moved up and down by driving the motor 41 while supporting the total weight such as the weight of the rotating plate 53, the pallet 3, and the stacked products by the four air cylinders 61. Therefore, the horizontality of the elevating plate 51, that is, the horizontality of the rotating plate 53, can be maintained with high accuracy.

Further, even while the rotating plate 53 is rotating, the horizontality of the rotating plate 53 can be maintained with high accuracy. When the film 1 is torn horizontally, the starting point a and the end point b can be matched, so that the shrink film 1A wound on the back surface 3b can be almost certainly separated from the remaining shrink film 1, and therefore, The cut-off shrink film 1A can be suctioned and removed almost certainly by the suction means 35.

Further, in this embodiment, the plurality of rollers 52 interposed between the elevating plate 51 and the rotating plate 53 are arranged so as to draw a circular locus on concentric circles having different diameters. As compared with the case of moving on the same circle, there is an effect that the wear of the elevating plate 51 and the rotating plate 53 can be suppressed.

Although the present invention has been described based on one embodiment, it is obvious that the present invention is not limited to this.

For example, the rotary table lifter can be applied not only to the shrink film skirt cutting system according to the present invention but also to all rotary table lifters that need to maintain the levelness of the rotary table. is there.

[0036]

As is apparent from the above description, according to the present invention, it is possible to automatically remove the skirt of the shrink film, and to provide a rotary table lifter which is advantageously used in this system. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a film package using a shrink film.

FIG. 2 is a front view showing a product packaged in a film.

FIG. 3 is a plan view showing one embodiment of a shrink film skirt cutting system according to the present invention.

FIG. 4 is a front view showing a first cutting unit.

FIG. 5 is a plan view of a rotary table lifter.

FIG. 6 is a side view of the rotary table lifter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shrink film 3 Pallet 3b Back surface 5 Product 9 Oven 100 Cutting system 21 Vertical feed conveyor 23 Horizontal feed conveyor 25 Conveyor 27 First cutting means 27a Cutter 29 Rotary table lifter 31 Second cutting means 31a Cutter 35 Suction means 41 Motor 51 elevating plate 52 roller 53 rotating plate 57 drive motor 61 air cylinder

Claims (4)

(57) [Claims] 1. A cutting system for a skirt portion of a shrink film in which products stacked on a pallet are covered together with the pallet, wherein a first cut in which a shrink film covering a back surface of the pallet is vertically cut from a side surface to a back surface of the pallet. Means, and second cutting means for cutting at least one circumference of the side surface of the pallet in the circumferential direction of the pallet starting from the portion cut by the first cutting means, and separated by the first and second cutting means. And a suction means for sucking and removing the shrink film covering the back surface of the pallet. 2. A transport conveyor for transporting the pallet, the pallet being provided in the middle of the transport conveyor, moving the pallet higher than the transport conveyor, and tearing the shrink film by a second cutting means. A rotary table lifter for rotating the rotary table, the rotary table lifter being lifted and lowered via a screw driven to rotate by a motor, a rotary table connected to the rotary table, and the rotary table and the stacked products. The shrink film skirt cutting system according to claim 1, further comprising: an air cylinder that substantially supports a total weight of the shrink film; and a driving unit that rotationally drives the rotary table. 3. A rotary table that is lifted and lowered via a screw that is driven to rotate by a motor, an air cylinder that is connected to the rotary table and substantially supports the total weight of the rotary table and the stacked products, and the rotary table. And a driving means for driving the rotary table. 4. The rotary table includes a lifting plate that is raised and lowered through the screw, and a rotary plate that is driven to rotate by the driving unit, and the rotary plate draws circular paths having different diameters. 4. The rotary table lifter according to claim 3, further comprising a plurality of rollers rolling on the lifting plate.