JP2000010208A - Timing belt adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timing belt adjustment device in which a pulley bracket can be fixed in the state that the tension of a timing belt is proper when the timing belt is assembled and the tension of the timing belt is not relaxed when the timing belt is driven. SOLUTION: A pulley 102 is loaded on the pulley bracket 104. A spring 109 is locked between a leg 106 and a hook 108. When the timing belt 101 is laid around the pulley 102, the pulley 102 stands still at a position where the tension of the belt 101 is proper by the pressing force of the spring 109. Thus, assembling work can be easily executed in the state that the tension of the belt 101 is proper. Further, by putting a bracket holder 110 on the pulley 102 and the bracket 104 and fixing it by a machine screw 111, the fixing state of the pulley 102 is not influenced even when the belt 101 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting a timing belt, and more particularly to an apparatus for adjusting a timing belt of an optical system reading means in a facsimile apparatus having an optical system reading means which reciprocates.

[0002]

2. Description of the Related Art A conventional timing belt adjusting device employs a configuration in which a pulley 402 on which a timing belt 401 is hung is mounted on a pulley bracket 403 and rotates about a rotation center 404 at one point.

[0003] A spring 405 connects the pulley bracket 403 to the main body of the apparatus. When the spring 405 has a natural length, the pulley bracket 403 is at a position where the timing belt 401 cannot be hung on the pulley 402. At the time of assembly, an operator rotates the pulley bracket 403 about the rotation center 404 to press and contract the spring 405, and hangs the timing belt 401 on the pulley 402. When the pressing is stopped, the pulley bracket 403 is urged in the direction in which the timing belt 401 is stretched by the restoring force of the spring 405, so that the pulley bracket 403 stays at a position where the tension of the timing belt 401 becomes appropriate. In this manner, a position where the tension of the timing belt 401 becomes appropriate can be determined. Therefore, the pulley bracket 403 can be fixed at an appropriate position by the screw 406.

[0004]

However, the conventional apparatus employs a structure in which the pulley bracket 403 is directly screwed to the apparatus body, so that the position of the pulley bracket 403 is adjusted by the fastening force of the screw 406 during assembly. There is a problem in that the pulley bracket 403 is fixed in a state in which the tension of the timing belt 401 is not appropriate.

In addition, since the timing belt 401 is simply hung on the pulley 402 and the pulley bracket 403 is directly fixed to the apparatus main body, the timing belt 401 is easily displaced from the circumference of the pulley 402 and floats upward during driving. In addition, there is also a problem that the timing belt tension is not stabilized during driving of the timing belt because the timing belt is easily affected by external forces such as vibration and impact.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to fix a pulley bracket in a state in which the tension of a timing belt is appropriate at the time of assembly, and the tension of the timing belt is not loosened during driving of the timing belt. It is an object to provide a timing belt adjusting device.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention has taken the following means.

According to a first aspect of the present invention, there is provided a timing belt adjusting device, comprising: an urging means for urging a rotation center of a pulley on which a timing belt is hung in a direction in which a tension of the timing belt is tensioned; A configuration including a pulley bracket urged by urging means, and a holder that covers the pulley and the pulley bracket along an upper surface and side surfaces of the pulley is adopted.

According to this structure, the pulley can be fixed at a position where the tension of the timing belt is appropriate, and the screwing is performed without directly fastening the pulley bracket on which the pulley is mounted. Since the operation is performed from above, the position of the pulley once determined does not shift during fixing. Furthermore, when the timing belt is screwed in this way, it is possible to prevent the timing belt from floating upward during driving, and to be affected by the tension of the timing belt by external force such as vibration or impact during driving of the timing belt. Absent.

According to a second aspect of the present invention, in the timing belt adjusting device of the first aspect, the urging means is a wire rod-shaped spring locked at a pair of hooks at two ends at both ends. take.

According to this structure, it is not necessary to fix the elastic body serving as the urging means to the apparatus at the time of assembling, and it is sufficient to sandwich the elastic body between the members, so that the assembling is facilitated.

According to a third aspect of the present invention, there is provided a timing belt fixed to a reciprocating portion, a driving portion for rotating the timing belt for moving the reciprocating portion, and a tension of the timing belt. And a timing belt adjusting device according to claim 1 or 2 that keeps the timing belt properly.

According to this configuration, since the drive of the timing belt is stabilized by the timing belt adjusting device of the present invention, the movement of the reciprocating portion is stabilized.

According to a fourth aspect of the present invention, there is provided an image reading apparatus having a configuration in which an image reading section for reading an image is mounted on the reciprocating portion of the reciprocating mechanism of the third aspect.

According to this configuration, since the movement of the image reading section is stabilized, the image reading operation is stabilized.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1A and 1B are schematic diagrams showing a configuration of a timing belt adjusting device according to an embodiment of the present invention. FIG. 1A is an assembly schematic diagram showing a state at the time of assembly, and FIG. 1B is a completed perspective view showing a state where the assembly is completed.

The pulley 102 on which the timing belt 101 is hung is rotatably mounted on a pulley bracket 104 having a shaft 103 serving as a rotation center of the pulley 102. Pulley bracket 104 on which pulley 102 is mounted
Is mounted on the apparatus main body 105. At this time, the leg 106 of the pulley bracket 104 is
Enter 07A. The guide hole 107A has a shape as shown in the figure because the guide hole 107A needs to be brought closer to the timing belt 101 when the timing belt 101 is hooked on the pulley bracket 104 as described later.

A wire rod-shaped spring 109 serving as an urging means is sandwiched between a hook 108 and a leg 106 which are a part of the apparatus main body 105, and adjusts the position of the pulley bracket 104 at which the tension of the timing belt 101 becomes appropriate during assembly. Decide. The process is as follows.

When the spring 109 is in a natural state, the pulley bracket 104 does not reach the timing belt 101 and pulley 1
It is in a position where it cannot be hung on 02. When the operator presses the spring 109 with the pulley bracket 104,
The pulley 102 approaches the timing belt 101, and the timing belt 101 can be hung on the pulley 102. Pull the timing belt 101 to the pulley 102
Then, when the pressing on the pulley bracket 104 is stopped, the timing belt 101 pulls the pulley bracket 104 via the pulley 102 in the direction in which the tension of the timing belt 101 is weakened.
Are biased in the reverse direction by the restoring force, so that the pulley bracket 104 stops at a position where the balance can be obtained.

At this time, the pulley bracket 104 is
6, of the two legs farther from the timing belt 101 (hereinafter, referred to as the farthest leg 106), a step is formed such that the lower portion has a larger diameter as described later with reference to FIG. 1A, the pulley bracket 104 is caught by a guide hole 107A having a shape as shown in FIG. 1A which is farther from the timing belt 101 (hereinafter, referred to as a farther side of the guide hole 107A), and the pulley bracket 104 stops. I do.

That is, the far side of the guide hole 107A is
As shown in the figure, it has a shape in which two rectangles having different widths are combined with each other, and a thicker portion farther from the timing belt 101 farthest from the guide hole 107A is an insertion portion. The narrower part closer to is the fixing part. The width of the insertion portion is wider than the large diameter of the far lower portion of the leg 106, and the width of the fixing portion is
The far lower part is narrower than the larger diameter at the bottom and wider than the smaller diameter.

Therefore, when determining the appropriate position of the pulley bracket 104, the far side of the leg 106
7A, the pulley bracket 104 is brought closer to the timing belt 101 to hang the timing belt 101 on the pulley 102, that is, the far side of the leg 106 is advanced to the fixing portion of the guide hole 107A. Then
The lower part of the leg 106, which has a large diameter at the far side, is wider than the width of the fixed part, so that the far part of the leg 106 does not come off. Therefore, after the timing belt 101 is hooked on the pulley 102, the timing belt 1
01 does not come off the pulley 102 due to the tension, and the pulley bracket 104 does not deviate from the appropriate position described above. Therefore, with the configuration using such a spring 109, it is possible to determine the position of the pulley bracket 104 at which the tension of the timing belt 101 becomes appropriate during assembly.

The bracket holder 110 holds the pulley 10
2 It is put on the pulley 102 and the pulley bracket 104 along the upper surface and the side surface. The screw 111 secures the position of the pulley 102 by fixing the bracket holder 110 to the apparatus body 105 via the guide hole 107B of the pulley bracket 104. At this time, the screw 111 is not directly fastened to the pulley bracket 104 on which the pulley 102 is mounted, but is tightened from above the bracket holder 110. Therefore, the pulling force of the screw 111 does not cause the pulley bracket 104 to be displaced. Can be assembled at a position of the pulley 102 where the tension of the pulley becomes appropriate.

Also, by the bracket holder 110,
Since the belt is prevented from floating upward while the timing belt 101 is being driven, and the pulley 102 is fixed so as not to be affected by external force such as vibration or impact during driving, the driving of the timing belt 101 is stabilized.

Furthermore, a configuration is adopted in which parts are stacked one on top of the other using a wire rod-shaped spring 109, and the pulley bracket 104 is attached to the legs 106 even when the operator does not press the screw 111 when the screw 111 is stopped. And the spring 109, the assembling is easy.

FIG. 2 is a top view showing the entire reciprocating mechanism of the reading device when the timing belt adjusting device of the present invention is mounted on an image reading device. Reciprocating scanning base 20
The reading unit 202 mounted on the printer 1 is fixed to the timing belt 101 rotated by the driving unit 203, and reciprocates on a rail (not shown) in accordance with the driving of the timing belt 101. The timing belt adjustment device 204 of the present invention appropriately maintains the tension of the timing belt 101 so that the movement of the reading unit 202 is stabilized.

Next, using the sectional view taken along the line AA 'and the sectional view taken along the line BB' in FIG. 2, a screw is set in a state where the pulley bracket 104 is urged by the spring 109 during assembly. By stopping, screw 11
The mechanism by which the timing belt 101 can be appropriately stretched without being affected by the tightening force of 1 and other external forces such as vibration and impact and fixed by the screws 111 will be described in detail.

FIG. 3A is a sectional view taken along the line AA 'shown in FIG. 2, and FIG. 3B is a sectional view taken along the line BB' shown in FIG.
FIG. As described above, the timing belt 101 is hung on the pulley 102,
Is mounted on the pulley bracket 104, and the pulley 102 and the pulley bracket 104 have the bracket holder 11.
0 is covered. The spring 109 is locked by the hook 108 and urges the leg 106 of the pulley bracket 104.

As shown in FIG. 3A, the spring 109
It is in contact with the leg 106 at the center. The spring 109 causes the pulley 102 and the pulley bracket 104 to move in the direction A,
As the tension of 01 is pulled in a direction in which the tension is relieved, the leg 106 pushes the leg in the direction a. However, as shown in FIG.
One side is in contact with the pair of hooks 108. Accordingly, even when the spring 109 is pressed in the direction a by the leg 106, the spring 109 itself does not move in the direction a or the upward direction, and the displacement of the central portion received by the pressing is opposite to the direction a as the elastic body. In the direction b. Therefore, the spring 109
Urges the leg 106 in the direction B, so that the timing belt 101 can be properly tensioned.

Therefore, since the spring 109 and the biasing force are balanced and stationary when the timing belt 101 is properly stretched, the pulley bracket 1 is
04 and the bracket holder 110 are not affected by external force such as vibration and shock when fixed to the apparatus main body, and the pulling bracket 1
The timing belt 101 is not improperly tensioned, that is, is not fixed in a loose state.

[0032]

As described above, according to the timing belt adjusting device of the present invention, the pulley bracket can be fixed in a state where the tension of the timing belt is appropriate at the time of assembling, and the tension of the timing belt can be fixed while the timing belt is being driven. Can be prevented from loosening.

[Brief description of the drawings]

FIG. 1A is a schematic diagram of an assembly of a timing belt adjusting device according to an embodiment of the present invention. FIG. 1B is a schematic perspective view of a completed timing belt adjusting device in the embodiment.

FIG. 2 is a top view of the entire reading apparatus.

3A is a cross-sectional view taken along line A-A 'in FIG. 2. FIG. 3B is a cross-sectional view taken along line B-B' in FIG.

FIG. 4 is a perspective view showing a configuration of a conventional timing belt adjusting device.

[Explanation of symbols]

 101 Timing Belt 102 Pulley 103 Shaft 104 Pulley Bracket 106 Leg 107A Guide Hole 107B Guide Hole 108 Hook 109 Spring 110 Bracket Holder 111 Screw 201 Reading Unit Base 202 Reading Unit 203 Drive Unit

Claims (4)

[Claims] An urging means for urging the rotation center of the pulley on which the timing belt is hung in a direction in which the tension of the timing belt is tensioned; a pulley bracket on which the pulley is mounted and which is urged by the urging means; A timing belt adjusting device, comprising: a holder that is placed on the pulley and the pulley bracket along an upper surface and a side surface of the pulley. 2. The timing belt adjusting device according to claim 1, wherein said biasing means is a wire rod-shaped spring locked at a pair of hooks at two ends at both ends. 3. A timing belt fixed to a reciprocating unit, a driving unit for rotating the timing belt for moving the reciprocating unit, and appropriately maintaining tension of the timing belt. 3. A reciprocating mechanism comprising: the timing belt adjusting device according to 2. 4. An image reading apparatus according to claim 3, wherein said reciprocating mechanism includes an image reading section for reading an image.