JPH07333744A - Wire drive - Google Patents

Abstract

PURPOSE:To prevent wire from being wound irregularly on a capstan pulley, without performing expensive machining. CONSTITUTION:A wire drive using a capstan pulley 2 having a cylindrical surface 2a on which a wire W for driving an exposure scanning optical system is wound in such a way that when the cylindrical surface 2a is rotated to pull one end of the wire W while loosening the other end, the wound position of the wire (W) on the cylindrical surface 2a moves toward one axial end, and that when the cylindrical surface 2a is rotated in the opposite direction the wound position of the wire (W) on the cylindrical surface 2a moves toward the other axial end, has a pair of ring plates 3, 4 sandwiching the wire W and axially movably mounted on the cylindrical surface 2a having the wire W wound thereon by plural turns, and has ring connecting members 6, 7, 8 for holding the pair of ring plates 3, 4 at a predetermined interval to each other and a means 12 for preventing rotation of the ring plates 3, 4, i.e., a plate rotation prevention means 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capstan around which a wire for driving an exposure scanning optical system used for reading an original image placed at an original reading position on a platen glass of a copying machine or an image scanner is wound. It concerns a pulley.

[Industrial applications]

[0002]

2. Description of the Related Art In an optical scanning type image reading apparatus such as a copying machine or an image scanner, an exposure scanning optical member such as a mirror and a line driven by a motor while supporting the exposure scanning optical member. An exposure scanning moving unit including a carriage that is pulled by a linear driving member (cable, belt, wire, etc.) and moves in a linear direction is used. FIG. 4 is an overall schematic view of a conventional general exposure scanning optical system. FIG. 5 is an explanatory diagram of an exposure scanning moving unit used in the exposure scanning optical system of FIG. 4, and is a front view. FIG. 6 is an explanatory view of an exposure scanning moving unit used in the exposure scanning optical system of FIG. 4, and is a plan view.

In FIG. 4, A is an upper case of the main body of the copying machine, and a lower case of the main body of the copying machine (not shown) is provided below the upper case of the copying machine main body. And
A copying machine body case is composed of an upper case A and a lower case (not shown) of the copying machine body. A platen glass A1 is provided on the upper surface of the upper case A of the copying machine body. An exposure scanning optical system U is arranged below the platen glass A1. The exposure scanning optical system U includes a first exposure scanning moving unit U1 including an illumination lamp and a first mirror, and a second exposure scanning moving unit U2 including second and third mirrors. ing.

In FIGS. 4 to 6, a capstan pulley 01 supported by a capstan shaft 01a rotatably driven by a drive motor (not shown) is arranged at the left end in the upper case A of the copying machine body, and an idler pulley is arranged at the right end. 0
2 are arranged. One end of the wire 03 for driving the exposure scanning optical optical system is fixed to the upper case A of the copying machine main body through a spring 04. This wire 03 is the second
After being half-turned around the idler pulley 05 of the exposure scanning moving unit U2, the left end capstan pulley 01
And is wound around the idler pulley 02 arranged at the right end. This wire 03
After being half-turned around the idler pulley 06 of the second exposure scanning moving unit U2, it is fixed to the right end of the copying machine main body upper case A. A portion 03a of the wire 03 between the idler pulley 05 and the capstan pulley 01 is connected to the cable connecting portion 07 of the first exposure scanning moving unit U1.

When the capstan pulley 01 of the exposure scanning optical system is rotationally driven, the first exposure scanning moving unit U1 and the second exposure scanning moving unit U2 move along the lower surface of the platen glass A1. At this time, the second exposure-scanning moving unit U2 moves at a speed (1/2) that of the first exposure-scanning moving unit U1.

In the exposure scanning optical system, the capstan pulley 01 on which the wire 03 is wound a plurality of times is rotated to wind up the wire 03, whereby the first and second exposure scanning moving units U1, U2 is moving. Wire 03 to the capstan pulley 01
If the winding state of No. 1 shifts, the winding amount of the wire 03 during rotation will not be uniform, and the quality of the read image will deteriorate. Therefore, the capstan pulley 01 and the wire 0 are used as parts.
3 is required to have a high diameter accuracy. However, even if the parts are highly accurate, the wire 03 is twisted, so that winding disorder occurs on the capstan pulley 01.

FIG. 7 is an explanatory diagram of winding disorder of the wire 03 on the capstan pulley 01. In FIG. 7, if the wire 03 wound around the capstan pulley 01 has winding disorder (see the portion indicated by arrow B), the winding amount varies due to the variation of the winding diameter when the capstan pulley 01 is rotated. . Therefore, the moving speed of the capstan pulley 01 in the main scanning direction varies, and a straight line in the sub scanning direction on the original becomes a curved line on the output image. 8A and 8B are explanatory diagrams of the influence of the fluctuation of the moving speed of the capstan pulley 01. FIG. 8A shows a straight line in the sub-scanning direction on the original image, and FIG. 8B shows that the straight line becomes a curve on the output image. ing.

The following techniques are conventionally known to solve the above problems. (J01) Technology shown in FIG. 9 FIG. 9 is an explanatory view of a capstan pulley 01 having a spiral groove formed on the surface thereof, and FIG. 9A is a wire when the exposure scanning optical system U is on the scan home side. FIG. 9B is a diagram showing a winding position of the wire 03, and FIG. 9B is a diagram showing a winding position of the wire 03 when the wire 03 is moved to the scan end side. As shown in FIG. 9, by forming a spiral groove on the capstan pulley 01, it is possible to prevent the winding disorder of the wire 03 on the capstan pulley 01, which causes deterioration of image quality.

[0009]

However, the conventional technique (J01) has the following problems. Problem of (J01) When a spiral groove is provided in the capstan pulley 01, a highly accurate spiral groove is required, so that the processing cost of the capstan pulley 01 becomes high and the cost of parts significantly increases. Will rise. In addition, since it takes time to process, there is a problem in mass productivity. In view of the above-mentioned circumstances, the present invention has an object to be described below (O01). (O01) To prevent winding disorder of the wire on the capstan pulley without performing high cost processing.

[0010]

The present invention devised to solve the above problems will now be described. The elements of the present invention are to facilitate correspondence with the elements of the embodiments described later. Note that the reference numerals of the elements of the embodiments are enclosed in parentheses. Further, the reason why the present invention is described in association with the reference numerals of the embodiments described later is to facilitate understanding of the present invention and not to limit the scope of the present invention to the embodiments.

In order to solve the above-mentioned problems, a wire driving device of the present invention is a wire (W) for driving an exposure scanning optical system.
Has a cylindrical surface (2a) wound a plurality of times, and when the cylindrical surface (2a) is rotated so as to pull one end of the wire (W) and loosen the other end, The winding position of the wire (W) moves to one end side in the axial direction,
A wire driving device using a capstan pulley (2) in which the winding position of the wire (W) on the cylindrical surface (2a) moves to the other end side in the axial direction when the cylindrical surface (2a) is rotated in the opposite direction. In (Y01), the wire (W) is axially movable while sandwiching the wire (W) around the cylindrical surface (2a) around which the wire (W) is wound a plurality of times. The pair of ring plates (3, 4) mounted (Y02) The pair of ring plates (3, 4)
4) Ring connecting members (6, 7,
8), (Y03) Means (12) for preventing rotation of the ring plates (3, 4), that is, plate rotation preventing means (12).

[0012]

Next, the operation of the present invention having the above features will be described. In the wire drive device of the present invention having the above-mentioned characteristics, the wire (W) is wound a plurality of times around the cylindrical surface (2a) of the capstan pulley (2). Wire (W)
On a surface of a cylindrical surface (2a) wound a plurality of times with a wire (W) sandwiched between the pair of ring plates (3, 3).
4) is held at a predetermined interval by the ring connecting members (6, 7, 8) and is movable in the axial direction with the wire (W) sandwiched. The plate rotation preventing means (12) prevents the ring connecting members (6, 7, 8) from rotating on the cylindrical surface (2a) to prevent the ring connecting members (6, 7, 8) from rotating.
8) to prevent interference (contact) with the wire (W).
The wire (W) wound around the cylindrical surface (2a)
Of the cylindrical surface (2
When a) is rotated, the winding position of the wire (W) on the cylindrical surface (2a) moves to one end side in the axial direction, and when the cylindrical surface (2a) is rotated in the opposite direction, the cylindrical surface (2a) is rotated. Two
The winding position of the wire (W) on a) moves to the other end side in the axial direction. At that time, the wire (W) wound around the cylindrical surface (2a) is connected to the ring connecting member (6, 7,
Since it moves while being sandwiched by the pair of ring plates (3, 4) held at a constant interval by 8), the occurrence of winding disorder is prevented.

[0013]

EXAMPLES Examples of the present invention will now be described with reference to the drawings, but the present invention is not limited to the following examples. In order to facilitate understanding of the explanation below,
Cartesian coordinate axes X-axis, Y-axis, and Z-axis are defined in the directions of arrows X, Y, and Z that are orthogonal to each other in the drawing, and the arrow X direction is the front, the arrow Y direction is the left, and the arrow Z direction is the up. In this case, the direction opposite to the X direction (front) (-X direction, that is,
Anti-X direction) is backward, Y direction (left side) is in the opposite direction (-Y direction, i.e., anti-Y direction) is right direction, and Z direction (upward) is in the opposite direction (-Z direction, i.e., anti-Z direction) is downward direction. Becomes Also,
It is called the front-back direction or the X-axis direction including the front (X direction) and the back (-X direction), and the left-right direction or the Y-axis direction including the left (Y direction) and the right (-Y direction), The upper direction (Z direction) and the lower direction (-Z direction) will be referred to as the vertical direction or the Z-axis direction. Furthermore, in the figure, "○" is put in "○".
The one with "" means an arrow from the back of the paper to the front, and the one with "x" in "○" means an arrow from the front to the back of the paper.

FIG. 1 is an exploded perspective view of an embodiment of the wire driving device of the present invention. FIG. 2 is a plan view of the embodiment, showing a state in which an exposure scanning optical optical system (not shown) moved by a wire wound around a capstan pulley is at a home scan position. FIG. 3 is a plan view of the same embodiment, and an exposure scanning optical optical system (not shown) moved by a wire wound around a capstan pulley.
FIG. 7 is a diagram showing a state when is at the scan end position. In FIG. 1, a device for driving a wire W for moving an exposure scanning optical system (not shown) (wire drive device)
Has a capstan shaft 1 which is rotationally driven in forward and reverse directions by a drive motor (not shown). A capstan pulley 2 is fixed to the capstan shaft 1. A wire W is wound around the cylindrical surface 2a of the capstan pulley 2 a plurality of times.

1 to 3, ring plates 3 and 4 are mounted on both sides of the wire W on the cylindrical surface 2a around which the wire W is wound so as to be movable in the circumferential direction and the axial direction. One ring plate 3 has three ring connecting members 6 extending toward the other ring plate 4.
7, 8 are provided. Each ring connecting member 6, 7, 8
Locking portions 6a, 7a, 8a are provided at the tip of
The locking portions 6a, 7a, 8a are locked in the locking holes 4a, 4b, 4c of the ring plate 4. The ring plates 3, 7 and 8 hold the ring plates 3 and 4 at predetermined intervals. The ring connecting members 6 and 7
Are arranged at the top and bottom (positions that are separated by 180 ° along the circumference), and the ring connecting member 8 is in the middle (position that is separated by 90 ° in the circumferential direction) and on the opposite side of the wire W extending direction. It is arranged.

The ring plates 3 and 4 have the cylindrical surface 2
Since they are mounted on a so as to be rotatable and movable, when they are rotated, the ring connecting members 6 and 7 may move in the extending direction of the wire W and interfere with the wire W. In order to prevent interference between the ring connecting members 6 and 7 and the wire W, the ring connecting member 8 is provided with a rotation preventing protrusion piece 9 extending outward in the radial direction. The outer end portion of the rotation preventing protruding piece 9 is fixed to the bracket 1.
It is inserted in one locking groove 11a. The locking groove 11a extends parallel to the axis of the capstan pulley 2 and has a function of permitting axial movement of the rotation preventing protrusion 9 but preventing circumferential movement thereof. It should be noted that, as the structure in which the rotation preventing projection piece 9 is allowed to move in the axial direction and is prevented from moving in the circumferential direction, it is also possible to allow no movement in the circumferential direction at all. It is possible to adopt a configuration that allows rotation within a range of angles (rotation that does not cause interference (contact) between the ring connecting members 6 and 7 and the wire W). A plate rotation preventing means 12 is composed of the bracket 11 having the locking groove 11a and the rotation preventing protruding piece 9.

(Operation of Embodiment) Next, the operation of the embodiment having the above-described structure will be described. In FIG. 2, when the capstan shaft 1 is rotationally driven in the direction of arrow A, the portion W1 of the wire W is unwound and the portion W2 is wound. In this case, the portion of the wire W wound around the capstan pulley 2 a plurality of times moves in the arrow (-X) direction (axial direction). At that time, the portion of the wire W wound around the capstan pulley 2 a plurality of times is
Since both sides thereof are sandwiched by the ring plates 3 and 4, they are axially moved in an aligned state without causing winding disorder. Then, it moves to the scan end side shown in FIG.

In FIG. 3, when the capstan shaft 1 is rotationally driven in the direction of the arrow (-A), the portion W1 of the wire W is wound and the portion W2 is unwound. In this case, the capstan pulley 2 of the wire W
The part wound several times on the top is in the arrow X direction (axial direction)
Move to. At this time, the portion of the wire W that is wound a plurality of times around the capstan pulley 2 is sandwiched between the ring plates 3 and 4 on both sides, so that winding is not disturbed and the shaft is aligned in an aligned state. Move in the direction. Then, it moves to the scan home side shown in FIG.

(Modifications) The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments, and is within the scope of the gist of the present invention described in the claims. Thus, various changes can be made. A modified embodiment of the present invention is illustrated below.

(H01) As the ring connecting member, it is possible to use various shaped members having a function of connecting the pair of rings 3 and 4 in a state in which they are held at a predetermined distance. (H02) The rotation preventing means 12 is a means for allowing the ring plates 3 and 4 to move in the axial direction on the cylindrical surface 2a of the capstan pulley 2 and to prevent the rotation in the circumferential direction. It is possible to adopt a configuration other than the configuration shown in the embodiment. For example, it can be configured by a guide groove formed on the cylindrical surface 2a of the capstan pulley 2 so as to extend in the axial direction, and a guided member provided on the ring plates 3 and 4 and engaged with the guide groove. Is.

[0021]

The belt conveyor of the present invention described above can achieve the following effects. (E01) The winding disorder of the wire on the capstan pulley can be prevented without performing high-cost processing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of a wire driving device of the present invention.

FIG. 2 is a plan view of the embodiment, showing a state in which an exposure scanning optical optical system (not shown) moved by a wire wound around a capstan pulley is in a home scan position. It is a figure.

FIG. 3 is a plan view of the embodiment, showing a state in which an exposure scanning optical optical system (not shown) moved by a wire wound around a capstan pulley is at a scan end position. It is a figure.

FIG. 4 is an overall schematic view of a conventional general exposure scanning optical system.

5 is a front view showing an exposure scanning moving unit used in the exposure scanning optical system shown in FIG. 4; FIG.

6 is a partial explanatory view of an exposure scanning moving unit used in the exposure scanning optical system of FIG. 4, and is a plan view.

FIG. 7 shows the wire 0 on the capstan pulley 01.
It is explanatory drawing of winding disorder of 3.

8A and 8B are explanatory diagrams of the influence of the fluctuation of the moving speed of the capstan pulley 01. FIG. 8A shows a straight line in the sub-scanning direction on the original image, and FIG. 8B shows the straight line as a curve on the output image. It has become.

FIG. 9 is an explanatory view of a capstan pulley 01 having a spiral groove formed on the surface, and FIG. 9A shows winding of a wire 03 when the exposure scanning optical system U is on the scan home side. FIG. 9B is a diagram showing a position, and FIG. 9B is a diagram showing a winding position of the wire 03 when it is moved to the scan end side.

[Explanation of symbols]

W ... Wire, 2 ... Capstan pulley, 2a ... Cylindrical surface,
3 ... Ring plate, 4 ... Ring plate, 6, 7, 8
... Plate connecting member, 12 ... Plate rotation preventing means

Claims (1)

[Claims] 1. A wire for driving an exposure scanning optical system has a cylindrical surface wound a plurality of times, and when the cylindrical surface is rotated so that one end of the wire is pulled and the other end is loosened,
A capstan in which the winding position of the wire on the cylindrical surface moves to one end side in the axial direction, and when the cylindrical surface is rotated in the opposite direction, the winding position of the wire on the cylindrical surface moves to the other end side in the axial direction. A wire drive device using a pulley, characterized in that the wire drive device has the following requirements: (Y01) The wire can be axially moved while sandwiching the wire around the cylindrical surface around which the wire is wound a plurality of times. A pair of ring plates mounted on the (Y02) ring connecting member for holding the pair of ring plates at a predetermined interval, (Y0
3) Means for preventing rotation of the ring plate.