JPH11165943A - Film cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a film in order to convert, without impairing the winding quality in the product winding, or to cut the film securely even in a low tension condition without giving the influence to the product even though the cutting of the article other than the product is carried out in a deckle-edged way, in the manufacturing process of the film. SOLUTION: In a film cutting device to cut a running long size film 9 in the width direction, a scissors form of cutting member to open and close the edges 1 in a range less than 90 deg.; a cutting member running mechanism to run the cutting scissors edges in the width direction of the film; and a cutting scissors edges closing mechanism to close the cutting scissors edges gradually as it runs in the width direction of the film; are provided, and the running film 9 is cut in the width direction by closing the cutting scissors edges gradually, while running the cutting scissors edges 1 in the width direction of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film cutting apparatus for cutting a running long film in a width direction. In the film manufacturing process, a material that cuts a continuously running film in the width direction, without stopping or decelerating the film to be conveyed, continuously switching the winding shaft or cutting out and turning to another process. This is an apparatus that is required in some cases to cut the film in the width direction. In particular, it is effective for cutting a film with thick edges and ears, which is generated when a film is produced by the flat die method.

[0002]

2. Description of the Related Art In a process of continuously winding a film product, it is common to cut a running film in a width direction and to perform a switching operation from a core that has been wound immediately before to a new core. . At the time of this switching, due to tension fluctuation, etc.,
The surface layer of the complete winding is displaced, and rewinding or wrinkling of the film is likely to occur at the core of the new core. Therefore, various measures have been taken to reduce the fluctuation in tension and to smoothly perform winding, but the cutting method is roughly classified as follows.

[0003] One is a type in which a cutter blade called a traverse cutter or slide cutter travels. The shape of the blade is almost knives, leather blades, or handy cutters.

[0004] The second type is a type in which cutting is basically performed using a blade having a width equal to or larger than the entire width of the film, and the shape of the blade is usually a saw blade. The use of this blade is called a flying cutter, a method of actively hitting the blade and causing the mountain blade of the saw to bite into the running film at high speed, or conversely, the blade is fixed or moved slowly, rather than the film path There is a method of cutting by changing the tension.

[0005]

Compared with the latter, the traverse method has a more beautiful cut surface in principle, and can be wound around a new core sequentially from the part to be cut out, so that there is no adverse effect on the core or the completely wound surface. It is thought that there are few. But,
If the tension and the sharpness of the blade are not good, the film will escape from the blade and will be partially cut off, or the film will be bundled in a bundle in front of the blade, and eventually it will not be possible to switch Product loss. If the films are bundled, the winding quality of the completed winding surface will also decrease. The present invention is to improve the sharpness of the traverse method.

Further, when a film is produced by the flat die method, a cut-off portion called an ear, which is a thick portion, is generally not cut out, collected, and reused. is there. This film with ears is cut out with a razor blade or shear fender in the product width direction. However, in order to change the transport direction, it is often the case that the film traveling speed is reduced, scissors are manually inserted in the width direction of the cut-off portion, and handed over to the collection process as part of the rising threading operation.

In many cases, a push-cut guillotine cutter and a suction device such as an ejector are combined to automate this part. This is because the film tension during running of the film is determined by the transport conditions that are taken to prevent the generation of wrinkles in the product section. This condition is represented by the speed ratio of the driving roll. Therefore, a guillotine method is used in which cutting can be performed reliably even at a low tension, because other methods that require an appropriate cutting tension cannot be used.

FIG. 5 shows a state of film cutting by a guillotine cutter. 9 in the figure is a film to be cut, 1
Reference numeral 0 denotes a guillotine cutter blade, and reference numeral 4b denotes a fluid cylinder that drives the blade. But such guillotine cutters
As the cutting width increases, there is a problem that a correspondingly large blade and its driving mechanism are required.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem of cutting with a low tension, which is a problem of the traverse type, without the disadvantage that the blade is enlarged due to the traverse method.

[0010]

According to the present invention, there is provided a film cutting device for cutting a running long film in a width direction, comprising a scissor-like cutting portion whose blade is opened and closed within a range of less than 90 °. The cutting section includes a cutting section traveling mechanism for moving the cutting section scissor blades in the film width direction, and a cutting section scissor blade closing mechanism for gradually closing the cutting section scissor blades as the cutting section scissor blades travel in the film width direction. The cutting film scissor blade is gradually closed while the scissor blade is running in the film width direction, and the running film is cut in the width direction.

That is, the cutter of the present invention has the shape of scissors, and has a fulcrum that can rotate freely like scissors. This device has a function of traversing this in the film width direction and has a structure for closing the scissor blades while traversing.

In the present invention, it is preferable that the cutting portion scissor blade closing mechanism has a structure in which the scissor blade is closed while the scissor blade is running by a guide, because the device configuration can be simplified and stable operation can be performed.

[0013]

1 shows an embodiment of the film cutting apparatus according to the present invention. In the drawing, 1 is a scissor as a cutting portion scissor blade, 2a is a linear motion system for moving the cutting portion in the film width direction, 5
Is a guide, 6 is a spring, 7 is a helical spring, 8 is a running block, and 9 is a long film running.

As the scissors 1, a general-purpose product that can be cut by hand can be used. The opening of the scissors 1 must be less than 90 ° at the maximum so that the film does not escape. This part is mounted on the linear motion system 2a for running. The portion of the linear motion system 2a may be, for example, a combination of a slide bearing and a shaft, and the driving device may be a fluid cylinder or an electric motor as in the related art, and may be a spring as a simpler example. Also, the traveling direction of the scissors is preferably in the direction of the film width, that is, the direction substantially perpendicular to the traveling film, as in the related art.

The scissors stand in an open state beside the running film, run toward the film when the film needs to be cut, and gradually close while shearing. When running beyond the running film width, the scissors are completely closed.

The mechanism for gradually closing the scissors in the cutting section is as follows.
It is also possible to control the motor 3 (see FIG. 3) or the fluid cylinder 4a (see FIG. 2) without using a guide. The method using the guide 5 for restricting the opening of the scissors is preferable because simple and stable operation is possible.

In the present invention, the phenomenon that the film escapes at low tension is improved by opening the scissors and guiding the film to the center of the blade without inevitability. And by adding shear to the cutting principle,
Achieve reliable cutting. Furthermore, the gradual closing of the scissors means that the part in contact with the film is constantly changing, which also contributes to the improvement of sharpness.

In this embodiment, the scissors 1 are for business use and have a blade portion of a length of 60 mm. Remove the handle and use spring 6
Was opened in the natural state. This was mounted on a linear motion system 2 having a running range of 400 mm consisting of a slide shaft and a bearing, and the pulling force of the helix spring 7 was used as a driving source for running. The average running speed of the blade is
At 00 m / min, the running speed of the film is equal to or less than a maximum of 300 m / min. Since the scissors open naturally, a guide 5 is provided to close the scissors,
One of the scissor blades slides its back. The other is fixed to the traveling block 8 of the linear motion system 2. The scissors were opening about 60 ° in the standby position.

The film 9 used was a polyethylene terephthalate film having a thickness of 5 μm or 15 μm, and each of the films with ears had an ear of about 0.1 mm and 0.3 mm and a width of 250 mm.

FIG. 4 shows a running state of the film. 12a and 12b in the figure are film drive rolls, respectively.
Denotes a film unwinder and 14 denotes a film winder. FIG.
As shown in the figure, the film on the cutting device is
The front and rear are nipped at 2a and 12b, respectively, and the tension can be adjusted by setting the speed ratio. In this state, the ratio was 1: 1, that is, the tension was almost 0, and the cutting speed was good at 300 m / min.

[0021]

Comparative Example FIG. 6 shows film cutting by a conventional saw blade or diamond cutter. 9 in the figure is a film, 11
Is a high-speed spindle, 15 is a disk-shaped saw blade, and 2b is a linear motion system.

Since the conventional leather type cannot be cut at a low tension, the saw blade 15 is rotated and run as shown in FIG. 6, or a diamond cutter is run instead of the saw blade 15 as in FIG. Tried to cut the film. The former can cut at a high speed of 300 m / min with low tension, but because the blade hits the film many times,
Small pieces of film have been scattered. These small pieces must never be caught in the product.
In the latter case, the film was not cut until the film speed reached about 100 m / min. However, when the film speed was increased, the film could not be cut, and the entire width could not be cut. The reason for this is that the frictional heat with the film greatly affects whether or not the film can be cut into a low-tensile film by a diamond cutter.

[0023]

According to the present invention, it is not necessary to increase the film tension when cutting a film, and one of the causes of impairing the winding quality at the time of product switching can be avoided. Stable cutting can be performed without being shaken. Moreover, as compared with a traverse cutter such as a leather blade, cutting with scissors makes it easier to maintain the certainty of cutting and the sharpness of the blade. With this certainty and sharpness, it is possible to cut a thick film with ears without difficulty, but the nature of the traverse type contributes to flexibility in adapting to film width and space saving of equipment.

[Brief description of the drawings]

FIG. 1 Film cutting device

FIG. 2 is a mechanism for closing a scissor blade using a fluid cylinder.

FIG. 3 is a cutting mechanism for closing a scissors blade using an electric motor.

FIG. 4 Running condition of film

FIG. 5: Film cutting with a guillotine cutter

FIG. 6 shows film cutting in a comparative example.

[Explanation of symbols]

 Reference Signs List 1 scissors 2a linear motion system 2b linear motion system 3 electric motor 4a fluid cylinder 4b fluid cylinder 5 guide 6 spring 7 helix spring 8 running block 9 film 10 guillotine 11 high speed spindle 12a drive roll 12b drive roll 13 unwinder 14 winder 15 saw blade

Claims (2)

[Claims] In a film cutting apparatus for cutting a running long film in a width direction, a scissor-like cut portion whose blade opens and closes within a range of less than 90 °, and a cut portion in which a scissor blade runs in a film width direction. And a cutting section scissor blade closing mechanism that gradually closes the cutting section scissor blades as the cutting section scissor blades travel in the film width direction. A film cutting device characterized in that the cutting film is closed in the width direction and the running film is cut in the width direction. 2. The film cutting apparatus according to claim 1, wherein the scissor blade closing mechanism of the cutting section has a structure in which the scissor blade is closed while the scissor blade is running by a guide.