JPS6216309Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents wrinkles in the film and irregularities in the cut ends that tend to occur due to swinging of the film during running when cutting the running film in the running direction with a razor blade. This provides clean edges and eliminates film breakage due to irregularities in post-processing.

Cutting a running film in the running direction with a razor blade is often used to treat the edges (so-called edges) of a stretched film using a tenter or the like, or to slit a wide film to a predetermined width. However, the film to be cut may be wrinkled in front of the laser blade due to differences in physical properties in the width direction, or due to fluctuations in the equipment before and after slitting, or the film may become loose due to uneven tension. As a result, the edges of the cut become uneven in the shape of a notch, which can lead to breakage or quality defects in subsequent processes. The present invention is a cutting device that nips the film on both sides of the razor blade, which are very close to each other, to suppress the movement of the film at the blade and prevent abnormalities caused by wrinkles and flapping of the film.

That is, the present invention provides an apparatus for inserting a razor blade into a running synthetic resin film and cutting it in the running direction, which is equipped with a pair of free rolls each having at least one slit groove in the circumferential direction; comprising means for nipping the running film in the width direction so that slit grooves provided in the rolls are at the same position, and the razor blade is disposed within the slit groove, and the razor blade is movable; This is a synthetic resin film cutting device that can cut synthetic resin films.

Next, the present invention will be explained with reference to the drawings.

Fig. 1 is a perspective view (schematic diagram) showing a conventional cutting technique. In the figure, a razor blade 2 is inserted into a film 1 traveling from bottom to top to cut it. The film 1 wobbles wildly in both directions, and wrinkles appear at the cut part, resulting in a lightning bolt-shaped cut edge as shown in Fig. 2A, or a stepped cut edge as shown in Fig. 2B, which causes breakage and quality defects in the subsequent process.

3 and 4 show an embodiment of the present invention. They are a side sectional view and a plan sectional view, respectively.

The running film 1 is nipped between a pair of nip rolls A4 and B5, which are a pair of free rolls each having a slit groove 3 shape.
Nipprol is made of a good material that grips the film securely. In this figure, both rollers are free rolls supported by rolling bearings, and these free rolls are preferably lined with rubber, for example, and are driven by the running of the film. One of the shafts A6 and B7 of both rollers is movable parallel to the film surface, and a nip action is applied by a coil spring, a pneumatic actuator, etc., but since the nip means of the present invention is well known, they are not shown in the figure. It is omitted. A razor blade 2 held by a razor blade holder 8 is located between the slits of the nip roll B5, and is inserted perpendicularly to the running film 1 to cut the film.

In the device of the present invention, the razor blade holder 8
is slidably attached with screw 9, so by moving the point of contact between the reggie blade and the film, the unused razor blade portion can be moved to the film cutting position and the razor blade can be used for a long period of time. It can be used for a wide variety of purposes.

Since the cutting device of the present invention cuts the film that has been nipped and restrained by two (a pair) of free rolls, it is possible to prevent irregularities in the cut end surface and stabilize the slitting and winding processes. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which the film is cut according to the prior art, and FIGS. 2A and 2B are plan views of the cut portion of the film produced according to the prior art.
3 and 4 are a side view and a plan view (cross-sectional view) showing the main parts of the cutting device of the present invention. In the drawing, 1 is a synthetic resin film, 2 is a razor blade, 3 is a slit groove, 4 and 5 are nip rolls, 6 and 7
is the Nitzprol shaft, 8 is the leather blade holder, 9 is
is a screw.

Claims (1)

[Scope of claims for utility model registration] (1) A device that inserts a razor blade into a moving synthetic resin film and cuts it in the running direction,
a pair of nip rolls each having at least one slit groove in the circumferential direction; a nipping means for nipping the running film in the width direction so that the slit grooves of each nip roll are arranged at the same position; A synthetic resin film cutting device comprising a razor blade disposed in a slit groove, the razor blade being movable so that the position of the razor blade cutting the traveling film is in an unused part. . (2) Cutting of a synthetic resin film according to claim 1 of the utility model registration, characterized in that the peripheral speed of at least one of a pair of nip rolls can be driven to be equal to the traveling speed of the film. Device. (3) The synthetic resin film cutting device according to claim 1 or 2, wherein one or both of the Nippro rolls are rubber-lined.