JPH083096Y2 - Image reader drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drive mechanism for moving a reading unit in an image reading apparatus which moves a reading unit having an optical system and photoelectrically converts an image.

[Prior Art] Generally, a drive mechanism of this type of device includes a winding transmission member such as a wire connected to a reading unit, and a driving pulley that winds the winding transmission member to rotate and move the reading unit. Is equipped with.

Then, hold the image reading device by hand and place it on the desired position of the document, first rotate the drive pulley forward to move the reading unit forward from the standby position to the read start position, and then reverse the drive pulley. Then, reading is performed while the reading unit is moved back from the reading start position toward the standby position.

By the way, the driving rotating body is pulled by the winding transmission member and is bent and slightly inclined. Therefore, the winding portion of the winding transmission member wound around the driving pulley gradually moves, and finally gets stuck to the flange portion of the free end portion of the driving pulley and gets stuck, or gets over the flange portion. Is occurring.

Therefore, Japanese Patent Laying-Open No. 1-238369 discloses a mechanism for restricting the movement of the winding transmission member. As shown in FIG. 3, a winding transmission member 32 such as a wire is engaged with the groove 31 of the restriction member 30, and the restriction member 30 follows the movement of the winding portion 32a of the winding transmission member. And is moved along the guide screw 33.

[Problems to be Solved by the Invention] However, in the technique disclosed in JP-A-1-238369, the structure is complicated and the winding portion of the winding transmission member 32 is wound.
32a remains in contact with the end portion of the drive pulley 34, and does not easily return to the central portion of the drive pulley 34. Therefore, the problem of clogging of the winding transmission member 32 and riding up cannot be said to be completely solved.

An object of the present invention is to cause the winding transmission member that is brought near the end of the driving rotation body to return to the center side of the driving rotation body by the reverse rotation of the driving rotation body, so that the winding transmission member is clogged.
An object of the present invention is to provide a drive mechanism for an image reading device that reliably prevents the user from climbing.

[Means for Solving the Problems] In order to achieve the above object, the features of the present invention are as follows.

That is, the features of the present invention are that the first restricting member that restricts the movement of the winding portion of the winding transmission member in the axial direction of the drive rotating body and the driving rotation body that engages with the winding transmission member. And a supporting member provided so as to be movable substantially parallel to the axis of the winding member, and a winding portion of the winding transmission member that is in contact with the first restricting member to move the supporting member substantially parallel to the axis of the driving rotating body. And a second regulating member that regulates the non-contact side end portion away from the first regulating member.

[Operation] When the first regulating member regulates the winding portion of the winding transmission member at the time of normal rotation (reverse rotation) of the driving rotating body, the support member engaged with the winding transmission member has the second regulation. It is regulated by the member on the side farther from the first regulating member than the non-contact side end of the winding portion. Therefore, when the winding transmission member is pulled out obliquely, and when the driving rotating body is rotated in the reverse direction (normal rotation), the winding portion is pulled back to the side opposite to the first restricting member.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

 FIG. 2 shows an overall outline of the image reading device.

In FIG. 2, 1 is a casing, and 2 is a reading unit having an optical system for reading an image by photoelectric conversion.

Support members 3 and 4 are provided on both left and right sides of the reading unit 2. One support member 3 is mounted on the guide rail 5. A guide rod 6 is inserted through the other support member 4. Further, a wire 7 as a winding transmission member is connected to the support member 4 via a spring 8 and a hook 9, for example. The wire 7 is wound around a pair of driving rotating bodies, for example, driving pulleys 10 and 11. A motor 12 is connected to one of the driving rotary bodies 10 via a gear or the like.

That is, the drive pulley 10 by the forward and reverse rotation of the motor 12,
The wire 7 wound around the driving pulley 10 rotates 11
The reading unit 2 is reciprocated between the standby position and the reading start position via the.

The drive pulley 10 is pulled by the wire 7, bends, and is slightly inclined. Therefore, the winding part of the wire 7 moves to the free end side of the drive pulley 10. A mechanism for preventing the wire 7 from being clogged and running up will be described with reference to FIG. 2 and FIG.

FIGS. 1 (a) and (b) are enlarged operation state diagrams in the vicinity of the driving pulley. In FIGS. 1A and 1B, members having the same reference numerals as those in FIG. 2 are the same members as those in FIG.

A first regulating member (flange portion of the driving pulley 10) 13 that regulates the movement of the winding portion 7a of the wire 7 in the axial direction of the driving pulley 10 is provided on the free end portion side of the driving pulley 10. There is. Reference numeral 14 is a rotary shaft of the drive pulley.

In the vicinity of the driving pulley 10, a supporting member for supporting the wire 7, for example, a supporting pulley 15 is rotatably fitted on the shaft 16. A V-shaped groove that engages with the wire 7 is formed on the outer periphery of the support pulley 15. Also, this support pulley 15
Can be moved along the axis 16 substantially parallel to the axis of the drive pulley 10.

Then, a second restricting member 17 that restricts the movement of the support pulley 15 substantially parallel to the axis of the driving pulley is provided. The second restricting member 17 is located inside the non-contact side end 7b of the winding portion 7a of the wire 7 in which the support pulley 15 is in contact with the first restricting member 13 (side away from the first restricting member 13). ). (See FIG. 1 (b)). The reason for this is that the wire 7 that is in contact with the first restricting member 13 is wound around.
This is because a gap G is formed between the non-contact portion 7b of 7a and the position of the supporting pulley 15, and the winding portion 7a is pulled back to the side opposite to the first regulating member 13 when the driving pulley 10 is rotated in the reverse direction. .

 The device configured as described above operates as follows.

Hold the image reading device by hand and place it at a desired position on the original.

Next, when a switch (not shown) is pressed, the drive pulley 10 is rotated in the normal direction by the motor 12, and the reading unit 2 is moved forward from the standby position to the reading start position via the wire 7. Then the motor
12 reverses and the reading unit 2 moves back from the reading start position toward the standby position, during which the image of the original is read by photoelectric conversion.

The drive pulley 10 is pulled by the wire 7, bends, and is slightly inclined. Therefore, when the drive pulley 10 is rotated normally (reversely), the winding portion 7a of the wire 7 is moved to the drive pulley 10
To the free end side, that is, from the position shown in FIG. 1 (a) to the position shown in FIG. 1 (b). The first regulating member 13 regulates the movement of the winding portion 7a of the wire 7 by contacting the winding portion 7a. At this time, the support pulley 15 moves substantially parallel to the axis of the drive pulley 10 while engaging with the wire 7. The movement of the support pulley 15 is regulated by the second regulation member 17 inside the non-contact side end portion 7b of the winding portion 7a of the wire 7 that is in contact with the first regulation member 13. Therefore, the non-contact side end portion 7b of the winding portion 7a of the wire 7 contacting the first restriction member 13 and the support pulley
A gap G is formed between the drive pulley 10 and the support pulley 15, and a gap G is formed between the drive pulley 10 and the support pulley 15.

When the driving pulley 10 is reversely rotated (normally rotated) from the state shown in FIG. 1B, the winding portion 7a is pulled back to the side opposite to the first regulating member 13.

As described above, since the winding portion 7a of the wire 7 once moved to the first restriction member side 13 is returned to the original position, the wire 7
It is possible to reliably prevent the winding part 7a of the device from being clogged or getting on.

Since the wire 7 is regulated by engaging the support pulley 15, the wire 7 is not worn.

Since the support pulley 15 also serves as the tension pulley, it is not necessary to provide another tension pulley.

[Effect of the Invention] According to the present invention described above, when the winding portion of the winding transmission member is regulated by the first regulating member, the support member that engages with the winding transmission member is the second regulating member. Is regulated on the side away from the first regulating member from the non-contact side end of the winding portion. Therefore, when the drive rotating body is next rotated in the reverse direction, the winding portion is returned to the side opposite to the first restricting member. Therefore, it is possible to reliably prevent the winding portion of the winding power transmission member from being clogged or getting on.

[Brief description of drawings]

1 (a) and (b) are operation state diagrams of an embodiment of the present invention, and FIG. 2 is a schematic plan view showing a main part of the embodiment.
FIG. 3 is a diagram showing a conventional example. 2: Reading unit, 7: Wire 10: Driving pulley, 12: Motor 13: First regulation member 15: Support pulley, 17: Second regulation member

Claims (2)

[Scope of utility model registration request] 1. A winding transmission member, such as a wire, which is connected to a reading unit for photoelectrically converting an image, and a driving rotary member for winding and rotating the winding transmission member to move the reading unit. A drive mechanism of an image reading apparatus including: a first restricting member that restricts movement of a winding portion of the winding transmission member in an axial direction of the drive rotating body; Then, the support member provided so as to be movable substantially parallel to the axis of the drive rotor and the movement of the support member substantially parallel to the axis of the drive rotor are applied to the first restricting member. A second regulating member that regulates the end of the winding portion of the winding transmission member which is in contact with the non-contact side end of the winding portion, and the second regulating member. mechanism. 2. The image reading apparatus according to claim 1, wherein the driving rotary member is attached to a rotary shaft having a free end at the first regulating member side and a supported end at the opposite end. Drive mechanism.