JPS59118651A - Skew preventive device of film and the like - Google Patents

Abstract

PURPOSE:To automatically absorb the skew of a sheet-like material with no drive mechanism by fixing both ends of an angle-like shaft supporting rolls to an arm across the rolls and supporting the arm at one point so that it can be rotated by a connecting rod connecting its center and a fulcrum. CONSTITUTION:A shaft 1 is bent at the center and coupled with a coupling tool 2, and rolls 3 with the same length are rotatably fixed to both ends of the shaft 1. Both ends of this shaft 1 are supported by an arm 4 across two rolls 3, and the arm 4 is supported at one point so that it can be rotated by a connecting rod 8 connecting a stopper metal 5 located at its center and a metal 7 rotating around a fulcrum 0. Accordingly, by rotatably fitting an arm 4 with a single support fulcrum, if asymmetrical outward forces are applied to a film by the left and right rolls 3 when the film is skewed, the rolls 3 are rotated until the symmetry is resumed, thus the skew is absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention occurs during the manufacturing process of sheet-like products such as films. This invention relates to a 100-yen device for preventing wrinkles, shrinkage, and especially meandering phenomena.

In order to prevent wrinkles or shrinkage that inevitably occur in a film between the rolls of manufacturing equipment and winding equipment or just before the winding roll when manufacturing and processing sheet-like materials such as films, conventional rubber rolls are attached to a curved shaft. An expander device consisting of the following is used and has achieved considerable effectiveness in removing wrinkles and preventing shrinkage.

However - this device has a curved roll.

Since both ends of the roll are rotatably fixed directly to the film forming device or winding device, there is a problem that it promotes meandering of the film. Also, since the roll is curved, there is a large resistance to rotating the roll. Cannot be used to smooth out wrinkles in thin film-sheets.

■The structure is complex and failures are likely to occur, and the cost per roll is low.Due to the rubber in the roll being expanded and contracted during use, it generates heat, accelerates deterioration, and has a short lifespan. Generally, the meandering phenomenon of film occurs because of uneven film thickness, uneven roll spacing, left and right play, uneven rotation, and sharpness. In the conventional expander device, this is promoted, and as a result, the film is wound in a uniform manner.If the edge is not removed after winding, the appearance of the roll will be poor and the product value will be lost.

The present invention was developed in view of this point.The roll is rotatably attached to a shaft bent at the middle part and formed in the shape of a chevron, and both ends of the shaft are fixed to arms that span the roll. It is equipped with two meandering prevention devices, such as films, which are characterized by being able to rotate one IO by means of a connecting rod that connects the center point and the forked door.

According to the present invention, this occurs in the structure and processing process of a sheet-like object such as a film. It is possible to prevent wrinkles and shrinkage, as well as their approximation, improve the rolled appearance of the product, and eliminate poor winding.

This will be explained in detail below with reference to the figures.

Fig. 1 shows an example of a table arrangement according to the present invention, in which a shaft 1 is bent at the center and is locked with a coupling 2, and a rotating σ-rule 3-3 of the same length is attached to the picture part of the shaft. It can be installed freely. Both ends of the shaft 1 are connected by arms 4 spanning rolls 3-3.
YJ! There is a fastener 5 at the center y point of the arm 4, and a fixed connecting rod 8 is attached to the metal fitting 7, which rotates around the fork point 0 set on the main body 6, that is, connected at 9. 88 are fixed at appropriate intervals t. As a result, the distance t between the -arm 4 and the fulcrum can be adjusted to +-J:m.

Since the intersection O is located at the center of the film traveling in the direction of the arrow, it is convenient to provide the metal fitting 7 on the glaze of the Dutch roll or on the main body of the device. The rolls 3.3 of the same length are made of elastic rubber-plastic and can be divided into a plurality of parts, each of which comes into contact with a traveling sheet-like object such as a film.

The device of the present invention has a configuration in which the arm is rotatably attached to a single support fulcrum as described above, but when considering the operating mechanism when this is used, as shown in FIG. The film w+w' moves in the direction of the arrow under the rolls R-R' with the forces A and A', and one roll generates forces B and B' on the film that move it outward. When force B acts on the film, there is a reaction BR on the roll.
Similarly, a reaction of BR' occurs on B'.

Let the orientation angles of 0-ru R-R' be C-C and rut, vv'=Wz -A=A'(~V=W' and 'J
A is due to the resistance of W and is proportional to W), then C
= C' + B-B・ The even hook is maintained and no shrinkage or meandering occurs. However, as shown in Fig. 3, when the roll is fixed and set as C-C', if the film shifts from the center and becomes W>W I, then A>A'-B>B' L
BR>BR', and the film moves further to the left as far as the dotted line, causing wrinkles, shrinkage, and meandering. On the other hand, in the device of the present invention, the rolls are rotatable with the beams as the intersection points, so B
When R>BR・, the roll rotates counterclockwise around O, resulting in the state shown in Figure 4, that is, C<C'-W)ν
V', A) From the state of A' - C in the equilibrium state of Figure 2
The roll rotates until -C' and the balance -B=B' can be maintained.

In this case, according to the apparatus of the present invention, since the roll has rotated by c'-c, the meandering of the film is reduced by the moving needle E of the roll center P. In the case of fixed rolls not according to the invention - in addition to the above, modification of D1E is necessary, which in practice must be stopped from operation.

The uninvented device is because the arm has a single point.
nt, 5 It is possible to consciously suppress and absorb meandering without any equipment, and there is no need to cut the edge after winding the roll, and what's more, the combination of bending type linear axis rolls has less resistance and is thinner. It has the advantage that the sheet is not stretched more than necessary, the structure is a tljt vehicle, and the life of the rubber roll is long, and excellent effects such as being able to further suppress meandering prevention can be obtained. The above explanation has been given for a combination of two curved axis rolls, but as shown in Figs.
The meandering prevention device of the present invention, which is equipped with a single roll or a curved roll, can also prevent meandering based on almost the same principle.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the mounting arrangement of the present invention, and FIGS.
FIG. 5 and FIG. 6 are plan views showing other embodiments of rolls used in the present invention. Patent applicant: Shin-Etsu Polymer Co., Ltd.

Claims (1)

[Claims] 1. A shaft bent at the middle part and formed into a hollow chevron shape,
A film, etc., characterized in that a roll is rotatably mounted, both ends of the shaft are fixed to an arm spanning the roll, and the arm is rotatable by a connecting rod connecting its center point and a fulcrum, supporting it at one point. Meandering prevention device. 2. The device according to claim 1, wherein the distance between the center point of the arm and the main body can be adjusted by a connecting ladder. 3. The device according to claim 1, characterized in that the roll is split into strips.