JP2000289903A - Carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web having a desired drawing magnification without freely contracting it by changing the position of bending point on the basis of the arithmetic information calculated from the detection signal by a web width detecting means having two or more variable bending points. SOLUTION: A plurality of retaining means constituted in clip shape to retain a web 1 is set in the state as an endless belt by driving rollers 111, 112, and the clips are constituted so as to be in closed state and opened state in the retaining position and carrying end position of the web 1, respectively. To set a web calculated from the detection information by a detecting means 2, the width is changed in at least two or more bending points 8 independently variably set between the retaining position and retaining end position of the web 1 by regulating the width of a screw part 5 by a drive motor 6. When the web 1 is drawn at a desired drawing magnification, the width for providing the desired drawing magnification in each bending point 8 is calculated, and the position of the bending point 8 is changed so as to have this width by the drive motor 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention relates to the manufacture of webs.
More specifically, the present invention relates to a transport device for drying a cellulose ester film.

[0002]

2. Description of the Related Art Cellulose ester films are used as supports for photographs and substrates for liquid crystal displays. The cellulose acetate film is cast on a support, dried after being separated from the support. A phenomenon such as so-called free shrinkage in which the cellulose acetate film shrinks during these series of steps occurs. If this free shrinkage is caused, a film having a desired width cannot be obtained, or the finished film does not satisfy desired performance, which has an adverse effect. As a method for solving such a free shrinkage, for example, Japanese Patent Application Laid-Open No. Sho 62-115035 discloses that a film is conveyed while applying tension in the width direction. Further, the document states that free shrinkage can be suppressed by fixing the edges on both sides of the film with a tenter clip or the like and conveying the film.

However, in actual production, the width of the film peeled off from the support is not constant, and the position at which the film is conveyed during fixing is also uneven. It was difficult to fix the edge of the.

In order to solve the problem, means for fixing both edges of the film have been movably installed and fixed.

[0005] However, a new problem has arisen with respect to fixing the film by movably installing means for fixing the edges on both sides of the film. After the film is fixed by the fixing means, the fixing member passes through the determined transport path, and the stretching ratio changes depending on whether the film width is wide or narrow when fixing the film, or the fixing position. Is a problem. When the stretching ratio changes, the physical properties of the film change, which is a problem in quality.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present inventors have provided a conveying apparatus capable of obtaining a web having a desired stretching ratio without freely shrinking the web.

[0007]

The above object is achieved by the following invention.

(1) In a conveying device for conveying while applying tension in the width direction of the web, the conveying device includes a web width detecting means, a holding means for holding the web,
It has two or more variable bending points, calculates the width of the web from the signal detected by the web width detection means,
(2) a conveying device that changes the position of the bending point based on the calculation information and conveys the web while applying tension in the width direction of the web, wherein the conveying device includes a web width detecting unit; Holding means for holding the web,
It has two or more variable bending points, calculates the width of the web from the signal detected by the web width detection means,
(3) a conveying device for conveying while applying tension in the width direction of the web, wherein the conveying device changes the holding unit to a film width based on the calculation information; Holding means for holding the web, and two or more variable bending points, calculating a web width from a signal detected by the web width detecting means, and holding based on the calculation information Means for changing the means to the film width and changing the position of the bending point in conjunction with the changed portion;
(5) The transport device according to any one of (1) to (3), wherein the web is a cellulose triacetate film. The transfer device according to any one of the above.

[0009]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. Also, in the following description, there are definite expressions for terms and the like, but show preferred examples of the present invention,
It is not intended to limit the objection or technical scope of the terms of the present invention.

FIG. 1 to FIG. 3 are plan views of a transfer device according to the present invention.

FIG. 1 shows that the web 1 is detected by the detecting means 2, held by the web holding means 3, and conveyed from left to right in the drawing. In FIG. 1, the detection means 2 only needs to be able to detect the leading end portion of the web 1 and need only be able to calculate the width of the web from the detected information. Preferably, the edge portions on both sides of the leading end of the web 1 are detected. The detection means 2
The signal detected at is processed by the arithmetic processing unit, and the width of the web 1 can be calculated.

The web 1 is held by holding means 3. A plurality of holding means 3 are installed on the rotary drive rollers 111 and 112 in a state like an endless belt. The holding means 3 has a clip-like configuration, and is installed such that the clip is closed at a position 3a for holding the web 1 and is opened at a position 3b where the conveyance of the web 1 ends. Such holding mechanisms are installed on both sides of the web 1 and transport the web 1.

The width of the holding section can be changed according to the information on the calculated width of the web 1. Specifically, the width of the screw portion 5 can be adjusted by the drive motor 4.

There are at least two or more bending points 8 between the position 3a for holding the web 1 and the position 3b where the holding of the web 1 ends. FIG. 1 shows a case where there are four bending points 8.

The bending points 8 are independently and variably installed. The width of the screw portion 5 can be adjusted independently of the bending points 8 by the drive motor 6.

Specifically, from the information detected by the detection means 2 and the width of the web calculated from the detected information, the width at the bending point is determined by the drive motor 6 so that the width of the web becomes the width of the web. It can be changed by adjustment, or can be stretched at a desired stretching ratio as shown in FIG. When stretching at the desired stretch ratio, from the information calculated the width of the web as described above, the width of the film at each bending point in order to further achieve the desired stretch ratio, is calculated to be the width The position of the bending point can be changed by the drive motor.

FIG. 3 shows that when the width of the web 1 is different, the position of the plurality of bending points 8 is also changed in conjunction with the change of the position of the holding position 3a based on the information detected by the detecting means 2. An example is shown.

Thus, the web 1 can be conveyed while being tensioned in the width direction, and can be fixed to an arbitrary width while suppressing shrinkage.

The web 1 conveyed in the present invention is preferably a cellulose acetate film, and more preferably a cellulose triacetate film. The thickness of the web used in the present invention is 120
μm or less, more preferably 85 μm
m or less, more preferably 50 μm or less.

The web of the present invention can be used as a photographic support or a protective film for a polarizing plate.

[0021]

According to the present invention, a web having an arbitrary width can be conveyed at a desired width without holding failure, and a desired stretching ratio can be achieved without overstretching a web having an arbitrary width. Can be stretched. Therefore, it is possible to always provide a web of constant quality.

[Brief description of the drawings]

FIG. 1 is a plan view of a transfer device according to the present invention.

FIG. 2 is a plan view in which the position of a bending point when extending in the transfer device of the present invention is changed.

FIG. 3 is a plan view in which the holding position with respect to the width of the web in the conveying device of the present invention is changed, and the position of the bending point is also changed accordingly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Web 2 Detecting means 3 Holding means 3a Holding position 3b Holding end position 4 Motor 5 Screw part 6 Bending point drive motor 8 Bending points 111, 112 Rotation drive roller

Claims (5)

[Claims] 1. A conveying device for conveying a web while applying tension in a width direction of the web, the conveying device comprising: a width detecting unit for the web; a holding unit for holding the web; and two or more variable bending points. And a web width is calculated from a signal detected by the web width detection means, and the position of the bending point is changed based on the calculation information. 2. A transport device for transporting a web while applying tension in the width direction of the web, wherein the transport device includes a width detection unit for the web, a holding unit for holding the web, and two or more variable bending points. A conveying device for calculating a web width from a signal detected by the web width detecting unit, and changing the holding unit to a film width based on the calculated information. 3. A conveying device for conveying a web while applying tension in a width direction of the web, wherein the conveying device includes a width detecting unit for the web, a holding unit for holding the web, and two or more variable bending points. Calculating the web width from a signal detected by the web width detection means, changing the holding means to the film width based on the calculation information, and interlocking with the changed position to set the position of the bending point A transport device characterized in that the transfer device is also changed. 4. The transport device according to claim 1, wherein the thickness of the web is less than 85 μm. 5. The transport device according to claim 1, wherein the web is a cellulose triacetate film.