JP2002199177A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader which is made small-sized to be able to surely adjust the belt tension of a rotation driving means. SOLUTION: A drive motor 33 is fixed vertically adjustable to a side wall 1A of a lower frame 1 parallel with a motor shaft, so that a drive motor 33 can be moved in the vertical direction to adjust the belt tension of a driving belt 32, when the driving motor 33 is arranged on the inside of rails 21a and 21b and directly below a driving shaft 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an image reading device that reads an image by an image pickup device such as a CD device.

[0002]

2. Description of the Related Art In a conventional image reading apparatus of this type, FIG.
As shown in FIG.
09 at least two rails 11 for movably supporting 09
3, a drive motor 101 as a rotation drive unit is disposed.

A drive shaft 114 is rotationally driven by a drive motor 101 via a drive belt 102, and the drive shaft 1 is driven.
Scanning tables 108 and 10 provided with a light source 104, mirrors 105, 106 and 107, etc., by wires (not shown) wound on a winding pulley 103 provided on 14.
By moving the document 9, the image of the document 116 placed on the document table glass 115 is formed on the CCD element 110 to read the image.

[0004] The drive motor 101 has a motor support plate 11.
1 is attached to the bottom of the frame 112 (horizontal plane in FIG. 3),
Is moved in the horizontal direction to adjust the tension of the drive belt 102.

[0005] Such a conventional image reading apparatus is described in, for example, JP-A-11-287294.

[0006]

However, in recent years, with the demand for downsizing of the image reading apparatus, a configuration in which the drive shaft 114 is disposed immediately above the drive motor 101 has become essential.

However, conventionally, the motor support plate 1
Since 11 is attached to the bottom of the frame 112, the drive motor 101 can only adjust the position in the horizontal direction. Therefore, when the drive shaft 114 and the drive motor 101 are arranged vertically, the drive motor 101
Is moved in the horizontal direction, the distance between the drive motor 101 and the drive shaft 114 hardly changes. Therefore, it is very difficult to adjust the drive belt 102 to a predetermined tension by moving the drive motor 101.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide an image reading apparatus capable of vertically adjusting the position of a rotary drive means, and to reduce the size of the apparatus. It is an object of the present invention to provide an image reading apparatus capable of reliably performing the adjustment of a drive transmission unit such as a drive belt.

[0009]

In order to achieve the above object, the present invention provides a document table on which a document is placed, an image pickup means for picking up an image of the document, and an object image between the document and the image pickup means. A scanning unit that moves and scans an image of a document while maintaining a constant separation distance, and a rotation driving unit that drives the movement of the scanning unit, wherein the image reading apparatus includes: By providing a fixing portion along the vertical plane, which can fix the rotation driving means at an arbitrary position in the vertical direction, the position of the rotation driving means can be adjusted in the vertical direction.

[0010] It is preferable that the scanning means has a drive shaft which is transmitted by a drive transmission means, and the rotary drive means and the drive shaft are arranged vertically.

A drive transmission means such as a wrapping transmission member is disposed between the rotary drive means and the drive shaft. A drive belt is used as the winding transmission member, and it is preferable that the tension of the drive belt can be adjusted by adjusting the position of the rotary drive means in the vertical direction.

As described above, even if the drive shaft and the rotary drive unit are vertically arranged, the rotary drive unit can be moved in the vertical direction. In addition, it is possible to easily adjust the drive belt to a predetermined tensile force.

It is preferable that the apparatus has at least two support means for supporting the scanning means, and the rotary drive means is disposed between the support means.

The fixing portion is preferably constituted by a side wall of a frame supporting the support means, but may be provided separately from the frame.

A document table on which a document is placed; image pickup means for picking up an image of the document; scanning means for moving and scanning the image of the document while keeping a constant distance between the document and the image pickup means At least two support means for supporting the scanning means, a rotation driving means for driving the movement of the scanning means, a drive transmission means for transmitting the rotation drive, and the drive transmission means for rotating the rotation drive means. And a drive shaft to which the drive is transmitted, wherein the rotary drive unit and the drive shaft are vertically arranged between the two support units.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

(Embodiment) FIGS. 1 and 2 show an image reading apparatus according to an embodiment of the present invention. FIG. 2 does not show the upper frame 2 and the platen glass 3.

That is, the image reading apparatus includes a document table glass 3 as a document table on which a document G is placed, a CCD element 12 as an image pickup means for picking up an image of the document G, And second scanning tables 4 and 7 as scanning means for moving and scanning the image of the original G while keeping the distance between the object images up to a constant, and at least two scanning tables supporting the first and second scanning tables 4 and 7. A pair of rails 21a and 21b as one support means, and a drive motor 33 as a rotary drive means disposed between the rails 21a and 21b to drive the movement of the first and second scanning tables 4 and 7 are provided. ing.

The platen glass 3 is supported by an upper frame 2, and the upper frame 2 is fastened integrally with the lower frame 1 to form an apparatus housing.

The first scanning table 4 supports a lamp 5 and a first mirror 6, and the second scanning table 7 supports a second mirror 8 and a third mirror 9.

A lens 10 is disposed in an optical path connecting the third mirror 9 of the second scanning table 7 and the CCD device 12. The CCD element 12 is attached to the CCD substrate 11,
It is controlled by the CCD substrate 11.

The rails 21a and 21b are fixed to the lower frame 1.

The first and second scanning tables 4 and 7 are connected to a wire 22
a and 22b are moved synchronously. The wires 22a and 22b are connected to the ends 23 fixed to the lower frame 1.
a and 23b are guided by second pulleys 24a and 24b rotatably supported by the second scanning table 7, and are fastened to the first scanning table 4 by fastening members 25a and 25b, and wire pulleys are provided. Several turns are wound around 26a and 26b. Further, a fixed pulley-2 rotatably supported by the frame body.
7a, 27b and again the second pulley 24a,
After being guided by 24b, it is fixed to the lower frame 1 frame via springs 28a and 28b.

A drive shaft 29 to which the wire pulleys 26a and 26b are fixed is rotatably supported by the lower frame 1,
It is driven to rotate by a drive motor 33 via drive pulleys 30 and 31 and a drive belt 32 as a wrapping transmission member constituting a drive transmission means. The drive motor 33 and the drive shaft 29 are arranged vertically.

A fixing portion is provided along the vertical plane (the vertical direction in FIG. 1) parallel to the rotation axis direction of the drive motor 33 so as to fix the drive motor 33 at an arbitrary position in the vertical direction. In this embodiment, the fixing portion is constituted by the side wall 1A of the lower frame 1. By adjusting the position of the drive motor 33 in the vertical direction, the drive belt 3
2 can be adjusted.

The drive motor 33 is fixed to a motor support plate 35 via an anti-vibration member 34. The motor support plate 35 is fixed to a vertical plane parallel to the axial direction of the drive motor 33 of the lower frame 1.

The motor support plate 35 can be fixed at any position in the vertical direction so that the drive belt 32 has a predetermined tensile force.

In such a configuration, the first mirror 6,
While bending the optical path with the second mirror 8 and the third mirror 9,
An image of the document G is formed on the CCD element 12 by the lens 10.

When the driving motor 33 is driven to rotate, the first scanning table 4 and the second scanning table 7 are moved in the X direction at a speed of 2: 1 via the wire 22 or the like. The image is scanned while the distance between the object image from the placed document G and the CCD element 12 is kept constant.

The image formed on the CCD 12 is converted into image data as is well known.

(Other Embodiments) In the above embodiment,
The motor support plate 35 is attached to the side wall 1A of the lower frame 1 as a fixing portion. However, a vertical surface parallel to the axial direction of the drive motor 33 of the lower frame 1 is provided separately from the lower frame 1 to provide the motor support plate 35. The same effect can be obtained by fixing in the same manner.

In the above embodiment, the drive shaft 29 is arranged on the drive motor 33. However, the same effect can be obtained even if the drive motor 33 is arranged on the drive shaft 29. Can be

[0033]

As described above, according to the present invention,
By providing the rotation driving means on a vertical plane parallel to the rotation axis direction of the rotation driving means so that the rotation driving means can be fixed at an arbitrary position in the vertical direction, the position of the rotation driving means can be adjusted vertically.

Further, by arranging the drive shaft and the rotary drive means in the vertical direction, the size of the apparatus can be reduced.

Further, even if the driving shaft and the rotary driving means are arranged vertically, the rotary driving means can be moved in the vertical direction. In addition, the drive transmission unit can be adjusted.

In particular, when a wrapping transmission member such as a belt or the like is used, the belt or the like can be adjusted to a predetermined tensile force, so that image deterioration due to variations in the tensile force is prevented, and the apparatus is greatly reduced. Miniaturization became possible.

If the fixing portion is constituted by the side wall of the frame supporting the supporting means, the structure of the apparatus can be simplified.

Further, if at least two support means for supporting the scanning means are provided, and the rotary drive means is arranged between the support means, the apparatus can be further simplified. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an apparatus configuration of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a top view of the device of FIG. 1;

FIG. 3 is a cross-sectional view illustrating a device configuration of a conventional image reading device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower frame 1A Side wall (fixed part) 3 Original table glass (original table) 12 CCD element (imaging means) 4,7 First and second scanning table (scanning means) 21a, 21b Rail (supporting means) 29 Drive shaft 32 Drive belt (wrapping transmission member, drive transmission means) 33 Drive motor (rotation drive means)

Claims (9)

[Claims] A document table on which a document is placed; an image capturing means for capturing an image of the document; and a scanning means for moving and scanning the image of the document while maintaining a constant distance between the document and the image capturing means. And a rotation driving means for driving the movement of the scanning means, wherein the rotation driving means is moved to an arbitrary position in a vertical direction along a vertical plane parallel to a rotation axis direction of the rotation driving means. An image reading apparatus, comprising: a fixing portion capable of being fixed. 2. An image reading apparatus according to claim 1, wherein said scanning means has a drive shaft which is transmitted by a drive transmission means, and said rotary drive means and said drive shaft are arranged vertically. apparatus. 3. The image reading apparatus according to claim 1, wherein a drive transmission unit is disposed between the rotation drive unit and the drive shaft. 4. The image reading apparatus according to claim 3, wherein the drive transmission means is a wrapping transmission member. 5. The image reading apparatus according to claim 4, wherein the wrapping transmission member is a drive belt, and the tension of the belt can be adjusted by adjusting the position of the rotation drive means in the vertical direction. 6. An image reading apparatus according to claim 1, further comprising at least two support means for supporting a scanning means, wherein said rotary drive means is disposed between said support means. . 7. The image reading apparatus according to claim 6, wherein said fixing portion is constituted by a side wall of a frame supporting said supporting means. 8. An image reading apparatus according to claim 6, wherein said fixing portion is provided separately from a frame supporting said supporting means. 9. A document table on which a document is placed, an image pickup means for picking up an image of the document, and a scanning means for moving and scanning the image of the document while keeping the distance between the document and the image pickup means constant. And at least two support means for supporting the scanning means, and a rotation driving means for driving the movement of the scanning means,
An image reading apparatus comprising: a drive transmission unit that transmits a rotational drive; and a drive shaft that is transmitted by the drive transmission unit to transmit the rotational drive of the rotational drive unit. An image reading apparatus, wherein a driving unit and the driving shaft are arranged in a vertical direction.