JPS649182B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a film wrinkle smoothing device that spreads a traveling film in the width direction to smooth out wrinkles.

PRIOR ART In order to smooth out the wrinkles of a film during travel, it is usually necessary to unfold the film in the width direction. Conventionally, an expander roll 1 or a cross guider 2 has been used as a film wrinkle removing device, as shown in FIGS. 1 and 2.

The expander roll 1 expands the film 3 in the width direction by giving the roll a curvature and utilizing the film width direction velocity component of the roll surface as the roll rotates. In order to use it effectively, the winding angle around the film roll must be greater than a certain value. Therefore, there is a problem in that the film path length between the rolls 4 and 5 before and after the expander roll 1 differs in the film width direction depending on the curvature of the expander roll 1, and tension unevenness occurs in the film width direction. Further, since the expander roll 1 usually has a complicated internal structure, it is not suitable for high-speed operation and has a problem that it is difficult to obtain a long life, and moreover, it is considerably more expensive than a normal roll.

On the other hand, the cross guider 2 holds the film 3 between a pair of rolls 6 whose axes are inclined on both sides and applies an expanding force to the film.
Since only an instantaneous and fixed direction spreading force can be applied to the paper by line contact with the roll 6, there is a problem in that the spreading capacity is low. In addition, in reality, the film itself has uneven thickness, and the edges on both sides of the film are usually thicker than other parts, so it is difficult to hold the film 3 in the width direction with line contact. There are also problems.

Purpose of the Invention In order to solve the problems of the conventional device as described above, the present invention provides a sufficient wrinkle smoothing effect without causing tension unevenness in the film width direction, can cope with high speed, and has a sufficient wrinkle smoothing effect. The object of the present invention is to provide a film wrinkle removal device that can provide a long service life.

Structure and operation of the invention The film wrinkle removing device of the present invention that meets this purpose applies a pair of rotatable discs to apply an unfolding force to the film, respectively, at positions on both sides in the width direction of the traveling film. It consists of shafts arranged at an angle to each other so as to hold the film in place.

In such a wrinkle removing device, as the disks rotate, the film holding portions of the pair of disks on both sides of the film generate a velocity component in the film advancing direction and a velocity component in the film width direction, that is, a velocity component in the direction in which the film is expanded. As the film advances through the disk portion, it is expanded in the width direction and wrinkles are smoothed out. Since the axes of the pair of disks are tilted to each other, the film is held between the outer edges of the disks, and since the film is held between the disks, the film starts to be held smoothly, and due to the elasticity of the film, the elasticity of the disk, etc. After the clamping state is maintained, it is smoothly released. Therefore, unlike the conventional cross guider, a certain time expansion force is applied to the film, rather than an instantaneous force.
Moreover, since the sandwiched film portion is reliably displaced in the width direction as the disk rotates, a sufficient spreading force is applied and wrinkles are reliably smoothed out. Further, since the film between the disks on both sides of the film is in a free state, no tension unevenness occurs in the width direction of the film. Furthermore, since the film is simply held between a pair of rotating disks, the structure is simple, it can easily handle high speeds, and it can provide a sufficient service life.

Embodiments Hereinafter, preferred embodiments of the film wrinkle removing device of the present invention will be described with reference to the drawings.

3 and 4 show a film wrinkle removing device according to a first embodiment of the present invention. In the figure, numeral 3 indicates a running film, which is moving in the direction of the arrow. A pair of rotatable disks 10 are provided on both sides of the film 3, respectively.

As shown in FIG. 4, the disks 10 are arranged on both sides of the upper and lower surfaces of the film 3, and their shafts 11 and 12 are tilted to each other so that the film 3 can be held between the upper and lower disks 10a and 10b. The outer edges are arranged close to each other or in contact with each other. disk 10
An elastic member such as rubber may be attached to one or both surfaces of a and 10b, and the film 3 may be held elastically therebetween.

Film holding section 13 made up of a pair of disks 10
As shown in FIG. 3, the film 3 is disposed at a position and in a direction where a spreading force is applied from the disk 10 to the film 3. That is, the film holding part 13 is arranged so that a line 14 connecting the film holding part 13 and the disk axes 11 and 12, that is, the rotation center of the disk, has a constant angle θ with respect to a line 15 perpendicular to the film traveling direction. , will be arranged.

The disks 10a and 10b above and below the film 3 are
Each is rotatably supported by a bearing 30, and the bearing 30 is supported by brackets 16 and 17. The upper bracket 17 is supported so as to be able to swing up and down about a hinge 18, and is urged downward by a spring 19, that is, in a direction that presses the disk 10b against the disk 10a. The spring force of the spring 19 can be adjusted by an adjustment bolt 21 attached to a bracket 20. Note that this biasing means is not limited to a spring, and may be any other means such as an air cylinder.

The operation of the film wrinkle removing device constructed as described above will be described below.

Since the disk 10 is rotatably supported, by sandwiching the film 3 between the two disks 10a and 10b, the disk 10 can hold the film 3.
The film 3 is rotated by a driving force applied thereto, and its rotational speed naturally synchronizes with the speed of the film 3.

As shown in FIG. 3, the film holding portion 13 is
As the disk 10 rotates. It has a velocity component A in the tangential direction of the disk 10. This velocity component A is
Since the film holding portion 13 has an inclination of θ with respect to the line 15 in the film width direction, not only the velocity component B in the film traveling direction but also the velocity component C in the film width direction
have. Since this velocity component C acts in a direction to spread the film 3 from both sides, the film 3 is spread in the width direction, and wrinkles in the film 3 are smoothed out.

The shafts 11 and 12 of the pair of disks 10 are tilted to each other, and the outer edges of the disks 10 come into contact with the film 3.Theoretically, the film holding portion 13 makes point contact, but in reality, the elasticity of the film 3 , disk 1
It has a certain section determined by the elasticity of 0, the inclination angles of the disks 10a and 10b, etc. In the film holding section 13, since the circular arcs of the rotating disks come into contact with each other, the film 3 starts to be held gradually and smoothly, and after being held for a short period of time,
released smoothly. By having a certain section of the film holding part 13, the film holding state is maintained for a certain period of time, and compared to the instantaneous spreading force applied to the film 3 by conventional cross guiders, the film 3 is reliably and sufficiently applied. It gives you great expansion power. Further, by having a certain section of the film clamping part 13, not only is a spreading force applied to the film 3, but the clamping part of the clamped film 3 is actually displaced in the width direction. disk 1
The wrinkles of the film 3 between 0 and 3 are reliably and sufficiently smoothed out.

In addition, since the film 3 is expanded from both sides by the disks 10, there is no problem of film path change as with conventional expander rolls, and the film 3 between the disks 10 is kept free. During this period, no tension unevenness occurs in the width direction of the film 3. Therefore, the wrinkles of the film 3 can be smoothly smoothed out without causing new wrinkles due to tension unevenness.

Next, FIG. 5 shows a film wrinkle removing device according to a second embodiment of the present invention. In this embodiment, the disks 22a and 22b are driven by the drive motor 23.
a, 23b. Furthermore, due to the structure, the upper disk 22b is connected to a spring 2 from the lower side.
4, it is biased toward the lower disk 22a, and the spring force is adjusted by the adjustment bolt 25. Also, the upper disk 2
Rubber 26 is applied to the side surface of the disk 22a of 2b, so that the film 3 can be held elastically.

In such a wrinkle removing device, before the film 3 is clamped by the discs 22a and 22b, the discs 22a and 22b are driven and their rotational speeds are synchronized with the speed of the film 3, so that the film 3 is subjected to impact. It is held smoothly without being pinched. Also, by driving the disk, the film 3
In addition to smoothing out wrinkles, the film 3 can also be actively fed out, and can also serve as a driving guide roll at long film paths. Note that the control of the drive motors 23a and 23b is as follows.
The control may be synchronized with the speed of the film 3, or may be controlled slightly faster than the speed of the film 3 to perform torque control. Other configurations and operations are similar to those of the first embodiment.

Effects of the Invention As explained above, when using the film wrinkle removing device of the present invention, the film is held between the disks on both sides, and spreading force is applied to the film by the rotation of the disks. The effect is obtained that wrinkles in the film can be reliably and sufficiently smoothed out without causing film tension unevenness between the disks on both sides.

In addition, since the film is simply held between rotating disks, the structure is simple, it can easily handle high speeds, it has a long life, and it can be manufactured at low cost. Effects can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional method for removing wrinkles using an expander roll, Fig. 2 is a plan view showing a method for removing wrinkles using a conventional cross guider, and Fig. 3 is a plan view showing a method for removing wrinkles using a conventional cross guider.
The figure is a schematic plan view of a film wrinkle removing device according to the first embodiment of the present invention, FIG. 4 is a side view of the device shown in FIG. 3, and FIG. FIG. 3 is a side view of the stretching device. 3...Film, 10, 10a, 10b, 22
a, 22b...disk, 11, 12...shaft, 1
3...Film holding part.

Claims (1)

[Claims] 1. A pair of rotatable discs are disposed on both sides of the traveling film in the width direction, with their axes tilted to each other so as to sandwich the film at positions that apply spreading force to the film. A film wrinkle removal device featuring: