JP2000170469A - Sheet winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind a sheet by uniform tensile force and prevent a wrinkle from occuring on the wound sheet by providing a small diameter part on a shaft body for winding the sheet and absorbing an increase of an outside diameter due to a thick wall part of the sheet. SOLUTION: A sheet 2 is composed of a sheet body made of a synthetic resin, and a thick wall part 4 is formed by fringe processing at both side fringes 2a, 2a. A cylindrical shaft body 3 winding the sheet 2 is provided with a locking part 12 fixing an end fringe of the sheet 2 at outer periphery, and a small diameter part 11 is provided in accordance with the thick wall part 4 of the sheet 2 in both side fringe parts 3a, 3a. Consequently, when the sheet 2 is wound around the shaft body 3, it is possible to absorb an increase of an outside diameter due to the thick wall part 4 of the sheet 2 by the small diameter part 11, wind the sheet 2 by uniform tensile force, and prevent a wrinkle from occuring on the wound sheet 2. When the thick wall part 4 is formed in a central part of the sheet 2, the small diameter part 11 may be formed in a central part of the shaft body 3, and the small diameter part 11 may be tapered without providing a stepped part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet winding device in which a sheet used as a light shielding film or the like is wound by a shaft.

[0002]

2. Description of the Related Art For example, at the entrance of a store or the like, a light-shielding film is provided to block sunlight. Further, there is also known a light-shielding film provided with a sheet winding device for winding the sheet around a shaft in order to move the sheet as needed.

[0003]

However, usually,
Both side edges of the sheet are subjected to edge processing, or a material different from the sheet is joined by welding, sewing, or the like. Therefore, both side edges of the sheet are thicker in the sheet retracting direction (direction orthogonal to the shaft) than the other portions.

[0006] When the sheet 20 is wound by the shaft 23, as shown in FIG. 6, the winding diameter of the side edges 20 a (thick portion 21) of the wound sheet 20 is reduced to the other portion 22 (sheet). , Etc.), the tension is not uniform over the entire area of the sheet, and the sheet is wrinkled. Of course, the thick portion 21 is not limited to the side edges 20a of the sheet 20, but may be formed at the center portion 22 or the like of the sheet 20 by forming a seam or the like. 20 had the same problem.

[0005] In view of the above, it is an object of the present invention to provide a sheet winding device that does not easily wrinkle a sheet when winding.

[0006]

Means for solving the above-mentioned problems include a sheet winding device in which a sheet 2 having a thick portion 4 is wound around a rotatable shaft 3. 3, a small-diameter portion 11 is formed, and the small-diameter portion 1 of the shaft body 3 is formed.
1 is that the thick portion 4 of the sheet 2 is wound.

As described above, according to the sheet winding device of the present invention, the thick portion 4 of the sheet 2 is wound around the small-diameter portion 11 of the shaft body 3, so that the thick portion 4 of the sheet 2 is Even if the outer diameter increases due to the overlap, the increased amount is absorbed by the small diameter portion 11. Therefore, unnecessary tension is not applied to the wound sheet 2.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sheet winding device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an overall view of a sheet winding device 1. 1 to 3, a sheet winding device 1 includes a sheet 2 and a rotatable shaft 3 that winds the sheet 2.

The sheet 2 is made of a sheet made of, for example, synthetic resin. As shown in FIG.
The a and 2a are subjected to edge processing and are formed thicker than other portions (that is, both side edges 2a and 2a of the sheet 2).
a is formed with a thick portion 4).

The shaft 3 is formed, for example, in a cylindrical shape, and a driving device 5 such as a motor is embedded in one side thereof. Note that the driving device 5 may be connected to the outside of the shaft body 3.

The other side of the shaft 3 is rotatably supported on the fixed side 6, and one side of the shaft 3 is
Are fixed to the fixed side 6. With this configuration, the shaft 3 can be rotated by the rotation of the rotation shaft of the driving device 5 (the rotation shaft of the embedded driving device 5 and the shaft 3
And the inner surface is fixed).

In the present embodiment, two shafts 3 are provided, one for winding the sheet 2 and the other for winding the pulling wire 8. A single roll may be used, or two sheets 3
May be wound up with each other, and the number of shafts 3 is not limited.

The two shafts 3 and 3 are arranged side by side at a predetermined interval, and one end of the seat 2 is attached to one of the shafts 3. A rod-shaped leading member 7 is fixed to the leading edge 2 b of the sheet 2. A pulling wire 8 is fixed to the leading member 7 and extends in the direction in which the sheet 2 moves out. The tip of the pulling wire 8 is attached to the other shaft 3 (a shaft for winding the wire). still,
10 is provided between the two shafts 3 and 3 and
Indicates an intermediate roller for supporting the pulling wire 8 from below, and 13 indicates a drum portion around which the pulling wire 8 is wound.

A small diameter portion 11 is formed on both side edges 3a of the shaft 3 to which one end of the sheet 2 is attached along the longitudinal direction of the shaft 3.

The outer diameter of the small-diameter portion 11 is determined in advance by the winding diameter of the thick portion 4 of the sheet 2 and the winding diameter of the other portion of the sheet 2 (where the sheet 2 has a normal thickness). The difference may be obtained by calculation, and may be set to a size smaller than the normal outer diameter portion 14 of the shaft body 3 by the length of the difference (or more).

The position where the small diameter portion 11 is formed is substantially the same as the width of the thick portion 2a of the sheet 2 or the thick portion 4 of the sheet 2.
It may be formed over a range longer than the width of.

Reference numeral 12 denotes a hook for attaching the one edge 2b of the sheet 2, 15 denotes a fitting portion to which the rotating shaft of the driving device 5 fits, and 16 denotes a fitting portion of the driving device 5. 6 shows a groove for inserting a screw or the like for fixing the rotating shaft and the shaft body 3.

In the sheet winding device 1 having the above-described structure, the shaft 8 to which the pulling wire 8 is attached is rotated forward, whereby the wire 8 is wound and the sheet 2 is sent out. On the other hand, by rotating the shaft body 3 to which one end edge of the sheet 2 is attached in the forward direction, the sheet 2 is wound up,
The seat 2 is stored.

At this time, the sheet 2 wound around the shaft 3
The thick portion 4 overlaps and the outer diameter increases. However, the shaft 3 has a small-diameter portion 11 formed thereon, and the thick portion 4 of the sheet 2 is located on the small-diameter portion 11. Since it is wound, the increase in the outer diameter can be absorbed by the small-diameter portion 11 (see FIG. 4). Therefore, it is possible to prevent a constant and uniform tension from being applied to the wound sheet 2 and prevent the sheet 2 from wrinkling.

In the above embodiment, the shaft 3 (and the small-diameter portion 11) is formed in a cylindrical shape. However, the shaft 3 is not necessarily limited to a cylindrical shape, and may be a polygon such as a hexagon. It may be formed in a shape or the like.

In the above embodiment, the small diameter portion 11
Are formed on both side edges 3a of the shaft 3,
Of course, the small diameter portion 11 is not limited to the one formed on both side edges 3 a of the shaft 3. That is, sheet 2
The small-diameter portion 11 may be formed at the position where the thick portion 4 is wound up. For example, in the case of the sheet 2 having the thick portion 4 formed at the center, the central portion of the shaft body 3 is correspondingly formed. Small diameter part 1
1 may be formed.

In the above embodiment, the small diameter portion 11
Is formed by providing a step in a part of the shaft body 3. For example, as shown in FIG. 5, a part of the shaft body 3 is formed in a tapered shape to provide a substantially arc-shaped concave portion. Thereby, the small diameter portion 11 may be formed. Thus, the small diameter part 1
When the sheet 1 is formed into a tapered shape, the outer surface of the shaft body 3 becomes smooth (there is no sharp portion), so that it is preferable when winding the sheet 2.

In addition, the above embodiments are merely examples, and the design can be changed as appropriate within the scope of the present invention.

[0025]

According to the sheet winding device of the present invention,
Since the thick part of the sheet is wound around the small diameter part of the shaft body, even if the thick part of the sheet overlaps and the outer diameter increases, the increase is absorbed by the small diameter part. Therefore,
Unnecessary tension is not applied to the wound sheet,
It is possible to prevent the sheet from wrinkling. In addition, since it is only necessary to form a small diameter portion on the shaft body, it can be easily manufactured and is extremely practical.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet winding device according to the present invention.

FIG. 2 is a partially omitted front view showing a shaft body. In addition, the sheet is indicated by a two-dot chain line.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partially omitted front view showing a state in which a sheet is wound around a shaft.

FIG. 5 is a partially omitted front view showing a state where a sheet is wound around a shaft body of another embodiment.

FIG. 6 is a partially omitted front view showing a state in which a sheet is wound around a shaft in a conventional sheet winding device.

[Explanation of symbols]

 2 ... Sheet, 3 ... Shaft, 4 ... Thick part, 11 ... Small diameter part

Claims (1)

[Claims] 1. A sheet winding device in which a sheet (2) having a thick portion (4) is wound around a rotatable shaft (3), wherein said shaft (3) has a small-diameter portion. (11) is formed, and the thick part (4) of the sheet (2) is wound around the small diameter part (11) of the shaft body (3).