JPH10264087A - Film cut device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film cut device capable of firmly bringing a die roll and an anvil roller into contact with each other by prescribed pressure without generating a cutting defective. SOLUTION: This device has a die roll 21 having a prescribed shaped blade on cylindrical peripheral surfaces arranged in the vertical direction and an anvil roller 24 receiving the blade of the die roll 21. A film is made to be cut into a blade shape by bringing the film into contact between the blade and the anvil roller 214 by prescribed pressure when the film passes between the die roll 21 and the anvil roller 24. Prescribed pressure when the film is held is made to be generated by supporting the die roll 21 so as to move in the vertical direction and directly imparting energizing force downward which is generated from a fluid cylinder 30 to the die roll 21. As a result, the die roll 21 does not bend and the blace can be brought into contact with the whole surface of the film by prescribed pressure because reaction from the anvil roller 24 is directly received by the die roll 21 which is thick in the diameter and strong in rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film cutting device used in a packaging device and comprising a die roll and an anvil roller.

[0002]

2. Description of the Related Art As an embodiment of a film cutting device installed at the last stage of a packaging device, a die roll 1 and an anvil roller 2 having blades formed on cylindrical peripheral surfaces arranged vertically as shown in FIG. Some have been provided. In this apparatus, a rotating shaft 3 of a die roll 1 and a rotating shaft 4 of an anvil roller 2 are rotatably supported by bearings 5 and 6, respectively. The bearing 5 on which the die roll 1 is mounted is movable in the vertical direction, so that a biasing force is applied to the bearing 5 downward.

[0003] As a result, the peripheral surfaces of the die roll 1 and the anvil roller 2 come into contact with each other at a predetermined pressure.
The film is cut along the shape of the blade formed on the peripheral surface of the package, and is separated into individual packages.

[0004]

However, in the above-described conventional apparatus, a downward biasing force is applied to the bearing portion 5, and the biasing force is applied to the die roll 1 from the bearing portion 5 via the rotary shaft 3. To be transmitted. Therefore,
If the reaction force from the anvil roller 2 side is large, the rotating shaft 3 as a transmission medium of the urging force may be deflected to an upward convex state by losing the reaction force. Then, the blade formed on the peripheral surface of the die roll 1 cannot contact the anvil roller 2 side at a desired pressure with a uniform pressure over the entire peripheral surface,
There is a risk of cutting failure.

Further, the dimension and shape of the blade formed on the die roll 1 are uniquely determined by the diameter of the die roll 1 and the number of processes per rotation. In other words, when cutting twice in one rotation, half of the circumference of the die roll 1 is the cut dimension. Therefore, when the cut size of the film and the number of processes per rotation are determined, the diameter of the die roll to be used is also determined. Therefore, in the case of a conventional film cutting apparatus using a die roll, it lacks versatility, and it is necessary to prepare various types of die rolls according to the cut size of the film and set an appropriate die roll.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and an object of the present invention is to solve the above-mentioned problems and to make a die roll and an anvil roller firmly contact with a uniform pressure over the entire peripheral surface. It is an object of the present invention to provide a film cutting apparatus which is capable of performing a cutting operation without causing a cutting defect, and which is versatile and can cope with different cutting dimensions with one die roll.

[0007]

In order to achieve the above object, in a film cutting apparatus according to the present invention, a die roll having a blade having a predetermined shape on a cylindrical peripheral surface, and an anvil roller receiving the blade of the die roll are provided. When the film passes between the die roll and the anvil roller, the film comes into contact with the blade and the anvil roller with a predetermined pressure, so that the film is cut into the shape of the blade. A film cutting device in a packaging device, wherein one of the die roll and the anvil roller is movably supported in an approaching / separating direction (vertical direction in the embodiment), and is attached to the movable die roll or anvil roller. By applying a direct pressure in the approaching direction by the biasing means, a predetermined pressure is generated when the film is sandwiched And configured to (claim 1).

Since the pressure is directly applied to the die roll or the anvil roller by the urging means, the die roll or the anvil roller has a larger diameter and a higher rigidity than the rotary shaft even when receiving a reaction force from the fixed side. Does not bend.
Accordingly, the die roll blade and the anvil roller can be brought into uniform contact with the entire peripheral surface at a predetermined pressure under a predetermined pressure, and the entire film can be reliably cut.

[0009] Of the die roll and the anvil roller,
For those that do not move in the approaching / separating direction, pressure may be applied directly in the approaching direction by auxiliary urging means (applying urging force in the direction of the two-dot chain line arrow shown in FIG. 1). 2). In this case, since both the die roll and the anvil roller receive the biasing force in a direction approaching each other, the film can be more reliably held at the predetermined pressure, which is more preferable.

Further, on the premise of the above-mentioned configuration, the length of the blade formed on the die roll in the circumferential direction, that is, the cut dimension is made longer than the cut dimension of the film, and the peripheral speed of the die roll is set to be periodic. It is preferable that the actual cut dimensions are made to match by moving the film at a speed faster than the moving speed of the film in at least a part of the section (claim 3).

Here, the "cutting dimension of the blade" is an arrangement interval (distance) along the peripheral surface of the blade formed parallel to the axial direction of the die roll, and is produced (cut) by one rotation of the die roll. Front-rear direction (moving direction of film)
When the number of rows of N is N, 1/1 of the circumference of the die roll
It corresponds to the length of N.

According to the third aspect of the present invention, the cut size of the film that can be handled by one die roll can take a value within a certain range only by appropriately changing and adjusting the rotation speed of the die roll. Thus, there is no need to make one-to-one correspondence with the die roll. This increases versatility and reduces the number of die rolls to prepare,
Storage and die roll replacement are also simplified. Further, the dimensional accuracy required for the diameter of the die roll can be reduced.

[0013]

1 to 3 show an example of a film cutting apparatus according to the present invention. As shown in FIG. 2, the film cutting device 10 is located on the downstream side of the top seal device 12 along the transport direction of the film 11. Then, in the present example, as shown in FIG.
a, the periphery of each package 11a is sealed by the top seal device 12 and cut by the film cutting device 10 to separate the sealed packages individually.

In the film cutting apparatus 10, a top plate 16 is mounted on top of columns 15 arranged two by two (four in total) at predetermined intervals on both sides of the film 11 in the transport direction. Be composed. Prop 15 arranged on the same side
A first bearing portion 18 is attached to the upper part so as to be able to move up and down, and a second bearing portion 19 is fixedly attached to the column 15 below the first bearing portion 18. And the double bearing part 1
A spring 20 is interposed between 8 and 19, and the first bearing portion 18 is urged upward by the elastic restoring force of the spring 20.

A die roll 21 is provided on the first bearing portion 18.
Is rotatably supported, whereby the die roll 21 can move up and down. A blade having a predetermined shape is formed on the peripheral surface of the die roll 21 (contact surface with the film 11). Specifically, 18
By rotating the package by 0 degrees, it becomes possible to cut the periphery of the four packages in one horizontal row shown in FIG. 3A, and by rotating once, the packages of the front and rear two rows are cut and separated. It can be manufactured.

A rotating shaft 25 of an anvil roller 24 is rotatably supported by the second bearing 19. The anvil roller 24 does not move in the vertical direction. One end of a rotating shaft 25 of the anvil roller 24 is connected to a driving motor (not shown) to receive a rotating force. Further, a gear 27 provided on the rotating shaft 25 and a rotating shaft 22 of a die roll 21 are connected to the rotating shaft 25. By meshing with the gear 28 provided, the rotational force transmitted to the anvil roller 24 is also applied to the die roll 21 side, whereby the two 21 and 24 rotate synchronously.

Here, in the present invention, the fluid cylinder 30 as urging means for urging the die roll 21 downward and bringing the blade provided on the peripheral surface of the die roll 21 into contact with the peripheral surface of the anvil roller 24 at a predetermined pressure is used. Attach it to the top plate 16. Then, the bearing 31 mounted on the tip of the cylinder rod 30 a of the fluid cylinder 30 is brought into contact with the peripheral surface of the die roll 21, and the downward urging force generated from the fluid cylinder 30 is directly applied to the die roll 21. . The bearing 31 (actually, two rollers 31)
By contacting a), the rotation of the die roll 21 is performed smoothly.

As described above, since the urging force is directly applied to the die roll 21, even if there is a reaction force from the anvil roller 24, the die roll 21 having a large diameter and high rigidity receives the reaction force. The rotating shaft having a small diameter does not bend due to the reaction force, and the die roll 21 is in a straight state in the axial direction. The die roll 21 contacts the anvil roller 24 at a predetermined pressure not only at both ends but also at the central portion in the axial direction. Will do. Therefore, the film 11 passing between the die roll 21 and the anvil roller 24 is entirely contacted by the blade formed on the peripheral surface of the die roll 21 at a predetermined pressure, so that the film 11 is reliably cut.

Further, in the present embodiment, as shown in FIG. 3, the relationship between the physical cut dimension d (half the circumference) of the blade formed on the die roll 21 and the cut dimension L of the film is d> L. I am trying to become. In this way, the film 1
In the conventional control method in which the transport speed of the die 1 and the peripheral speed of the die roll 21 match, the cut size of the film becomes equal to the cut size L of the blade of the die roll 21, so that the package cannot be cut at a predetermined position and the package having the cut size d Cannot be manufactured.

Therefore, in the present embodiment, the die roll 21 is rotated so that the peripheral speed is faster than the transport speed of the film 11, and the time required for the film 11 to move by the distance L and the die roll 21 are rotated by 180 degrees (peripheral surface). The operation is periodically shifted so that the time becomes equal to the distance d).

Thus, the dimensional difference d> L can be eliminated, and the film can be cut at a desired cut dimension L to produce a package. Moreover, the film cut dimension L can take a value within a certain range only by appropriately changing and adjusting the rotation speed of the die roll 21, and it is necessary to correspond to the die roll in a one-to-one manner as in the related art. Disappears. In other words, since the cut size of the package body that can be manufactured with one die roll can be widened, versatility is increased, the number of prepared die rolls is reduced, storage and exchange processing of die rolls are simplified, and cost is reduced. I can do it. Further, since the cut dimension can be adjusted at such a speed, the dimensional accuracy required for the diameter of the die roll can be moderated.

In the above-described embodiment, since the die roll is used to move up and down, the urging force of the fluid cylinder 30 as the urging means is directly applied to the die roll 21. However, the up and down movement is performed on the anvil roller side. In this case, the urging force is applied directly to the anvil roller.

Further, in any case, the fixed side (anvil roller in the illustrated example) which does not move up and down also receives the pressure from the other side, so that the rotating shaft is not bent by the pressure. A biasing force (indicated by a two-dot chain line in FIG. 1) may be directly applied to the pressure by a separately provided biasing means.

In the above-described embodiment, an example is shown in which the present invention is applied to a horizontal packaging device. However, the present invention can also be applied to a vertical packaging device. In that case, die roll 2
1 and the anvil roller 24 may be arranged in a horizontal direction so that the film advances in the vertical direction.

[0025]

As described above, in the film cutting apparatus according to the present invention, since the urging force is directly applied to the die roll and / or the anvil roller, the die roll and the like do not bend, and a uniform pressure is applied over the entire circumference. And the film can be firmly contacted, and the film can be reliably cut. In addition, with the configuration according to the third aspect, it is possible to have versatility, and one die roll can correspond to different cut dimensions. As a result, the types of die rolls to be prepared can be reduced, and storage and manufacturing costs can be reduced.

In particular, as the number of packages formed in one horizontal row increases, the widths (lengths in the axial direction) of the die rolls and anvil rollers also increase to increase the size.・ Reduction of types of die rolls to be prepared, etc.) appears more remarkably.

[Brief description of the drawings]

FIG. 1 is a view showing a preferred embodiment of a film cutting apparatus according to the present invention.

FIG. 2 is a view showing a preferred embodiment of a film cutting device according to the present invention.

FIG. 3 is a diagram illustrating a relationship between a cut size of a film and a cut size of a blade formed on a die roll.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 21 die roll 24 anvil roller 30 fluid cylinder (biasing means) 31 bearing (biasing means) L Cut size of film d Cut size of die roll blade

Claims (3)

[Claims] 1. A die roll having a blade having a predetermined shape on a cylindrical peripheral surface, and an anvil roller receiving the blade of the die roll. When the film passes between the die roll and the anvil roller, the film is A film cutting device in a packaging device configured to cut the film into the shape of the blade by being sandwiched between the blade and an anvil roller at a predetermined pressure, wherein one of the die roll and the anvil roller is close to each other.
A predetermined pressure at the time of sandwiching the film is generated by directly applying pressure to the movable die roll or anvil roller in the approaching direction by an urging means, the support being movably supported in the separating direction. A film cutting device. 2. The method according to claim 1, wherein an auxiliary biasing means directly applies pressure to the die roll and the anvil roller which do not move in the approaching / separating direction in the approaching direction. Film cutting equipment. 3. The cut size of the blade formed on the die roll is made longer than the cut size of the film, and the actual cut size is made to match by periodically changing the peripheral speed of the die roll. The film cutting device according to claim 1 or 2, wherein: