JPS60197559A - Reeling of film - Google Patents

Abstract

PURPOSE:To make it possible to reel even a film which is difficult to roll round a reel and obtain a good film roll by controlling the reeling speed of each independently driven core to follow the feeding speed of film and, at the same time, adjusting the reeling speed delicately according to the detected reeling tension. CONSTITUTION:The speed of revolution of a core 1 at each reeling position is controlled to synchronize with the feeding speed of a film, and, in this controll, the number of revolutions of the core 1 is reduced according to the changes of roll diameter detected in succession or the changes of the roll diameter set in advance, then controlled in comparisonwith the driving speed of the line, namely the speed of the drawing roller 4, and forced to synchronize with and follow them. On the other hand, with regard to the control of reeling tension, the output equivalent to the set reeling tension is compared with the output of a tension detecter 12, and according to this difference the speed of a driving motor m is adjusted delicately. Thus, the actual contact pressure can individually be controlled position by position, and the air film between the layers of film roll 3 in each position is controlled, then it is made possible to reel a roll in well-balanced shape.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a method for winding a film, and more particularly to an improvement in a method for simultaneously winding a plurality of films fed at a constant speed.

b. Prior Art and Problems As a process of simultaneously winding multiple strips of film into individual rolls, for example, there is a process of slitting one raw film into multiple strips of film and winding them into individual film rolls.

Conventionally, a so-called center rise method has been generally used as a winding method in the film slitting process.

In this center drive system, as schematically shown in FIG. 1, the core 1 is directly driven, and the touch roller 2 that applies contact pressure freely rotates in contact with the film roll 3 and rotates as a result.

As shown in FIG.
At L, each film strip is simultaneously fed to the winding section at a constant speed. On the other hand, each core 1 is rotatably supported by a holder 6 attached to a winding arm A5. The holder 6 is rotated by driving the holder 6 by a belt mechanism lO built in the holder 5.

The drive shaft rotates 70 times, giving rotational force to each core.
The speed of each driven core is always set to be slightly higher than the speed of the take-up roller 4. This speed gap is absorbed by the slip of each powder clutch 9, and a tension corresponding to the slip of the clutch 9 is generated in each film strip, and the film winding tension is adjusted by changing the slip of the clutch 9. be able to. By adopting such a winding method, all differences in winding torque caused by differences in mechanical resistance at each winding position and differences in physical properties of the film are absorbed by the clutch 9.
In the end, by changing the tension of each film, the winding speeds are kept constant. Therefore, if the tension level of the film can be set to a high level, or if the tension can be varied widely, even if there is a slight difference between each position, the uniform speed of each winding position can be maintained or the tension can be kept at a low level. Requires thin films or special surfaces (easily slippery).

In the case of a film having a negative tension, the permissible range of tension fluctuation is small, and depending on this method, it is difficult to successfully wind the film at each winding position simultaneously due to differences in the performance of the clutch itself.

Regarding this point, for example, as shown in FIG. It has also been proposed that the cores are driven by an auxiliary motor and the speed difference between the cores is adjusted by the auxiliary motor. -La 2A
There is also the problem that the friction coefficient of the film slightly affects the winding tension of the film, making it difficult to adjust the speed of the individual motor Ayu with the drive roller 2A, and as a result, setting the winding tension is extremely difficult. ◇ On the other hand, in order to wind up a good film roll, the amount of material used when winding the film is an important factor. This contact pressure is applied by a touch roller or a surface-driven p-ra core or by pressing on the film roll, and has the function of adjusting the air layer between the films of the film roll, thus changing the shape of the film roll. Related to this, the contact pressure in the conventional method is set by air pressure or hydraulic pressure applied to the touch ruler, but with this method, the contact pressure function of each take-up position may vary depending on the case, making it difficult to maintain a good film rule. The problem is that you can't get it.

CObject of the Invention The present invention has been developed in view of the above-mentioned problems, and it is possible to form a good film roll even with a film that is difficult to wind by winding the film while controlling the winding tension. This provides a winding method that allows for

d Structure 2 of the Invention Functions and Effects The present invention enables each core to be driven independently when simultaneously winding a plurality of films fed at a constant speed as individual rolls onto a core while applying contact pressure. A film winding method characterized in that the winding speed is controlled to follow the film supply speed, and the winding tension of the film is detected, and the winding speed is finely adjusted according to the detected tension. This is the way to take it.

This will be explained in detail below.

FIG. 4 is a schematic side view of a winding device for carrying out the method of the present invention, and the overall configuration of this device is almost the same as that of the conventional device shown in FIG. 2, and the same parts are designated by the same numbers. Indicated by

In FIG. 4, each core 1 is driven by an individual drive motor m to a position Kfi. touch a-92
is rotatably supported by an elastic support 11 such as a spring, and the displacement of this support 11 is proportional to the winding tension of the film, so this displacement detector is referred to as a tension detector 12. [Elastic support] 1 is attached to an arm 131C of the touch roller, and the arm 13 is pulled by an air cylinder 15 via a fulcrum 14 to apply contact pressure between the touch roller 2 and the film roll 3. .

A contact pressure detector 16 is attached to the arm 13 for measuring the output of the air cylinder 15 and detecting the resulting contact pressure. The aforementioned tension detector 12. Contact pressure detector 16
As such, any displacement or force detection means may be used, such as pressure measurement using a differential transformer, load cell, or piezoelectric element. Furthermore, as the tension detection and contact pressure detection method, instead of measuring the displacement of the touch roller 2 and the stress on the arm 13, a means of directly detecting the tension of the film or a means of directly measuring the contact pressure may be used. Although it is possible, it is currently difficult to find a practical means for implementing such a set.

Now, the method of the present invention using such an apparatus will be described. First, the take-up roller 4 is driven at a constant speed by a line drive motor ML as in the conventional method, and supplies each film strip to each winding device (each position) at a constant speed.

On the other hand, the rotational speed of the core at each s-taking position, that is, the speed of each drive motor m, is controlled to be synchronized with the film supply speed, in other words, the take-up roller speed. The rotational speed of the core is reduced in accordance with the diameter or a preset change in the winding diameter, and is synchronized and followed while being compared and controlled with the line drive speed, that is, the take-up roller speed.

On the other hand, regarding the winding tension control, the output corresponding to the set winding tension and the output of the tension detector 12 are compared L, and the speed of the drive motor m is finely adjusted based on this difference. When the tension is higher than the set tension, the speed is reduced, and when it is lower than the set tension, the speed is increased. In the illustrated example, the contact pressure is detected at each winding position, and the detected value is compared with a set value to adjust the air pressure applied to the air cylinder 15 of the contact pressure applying device, so that the contact pressure is always maintained. Maintain the specified settings.

From this, the actual contact pressure can be controlled individually for each position, and the film roll pressure at each position can be controlled individually.
rJJ The empty fi layer is control f+, and a roll with a uniform shape can be wound.

The present invention is as described above (each core is driven independently, each speed is synchronized with the line drive speed transformation, the winding tension of the film is detected, and the tension is adjusted to this detected tension. The speed of the core was finely adjusted accordingly (by doing so, the normal pressure winding tension was controlled while winding), so even at low tension levels, each winding position was aligned and a good film roll could be formed. Great value.

In the above explanation, the application of the present invention was mainly described to the slitting process of synthetic resin film. However, the present invention is not limited to such an example. It can be applied to all winding processes.

[Brief explanation of the drawings] Figure 1 is a schematic side view showing a conventional film winding system;
FIG. 2 is a simplified schematic plan view thereof, FIG. 3 is a schematic side view showing another conventional method, and FIG. 4 is a schematic side view showing the method of the present invention. 1 is the core, 2 is the touch roller, 3 is the film rule, 4
12 is a tension detector. 16 is a contact pressure detector, ML is a line drive motor. m is an individual (core) drive motor. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] L When multiple strips of film fed at a constant speed are simultaneously wound onto the core as individual rolls while applying pressure, each core is independently driven to adjust the winding speed of the core to the film. A method for winding a film, characterized in that the film is controlled so as to follow the supply speed, the winding tension of the film is detected, and the winding speed is finely adjusted according to the detected tension. 2. The contact pressure 2. A method for winding a film according to claim 1, wherein the film is wound while detecting and controlling this.