JP2019134467A - Image reading device - Google Patents

Abstract

To obtain an image reading device which has good slidability of a housing member housing a reading device body.SOLUTION: An image reading device 10 comprises: a reading device body 50 for reading an original placed on an original platen 14; a housing member 30 which houses the reading device body 50 and which, when reading the original, is supported by a cylindrical guide member 22 from below and moves from one end to the other end of the original; and a guided member 40 which is fastened to a lower face side of a bottom of the housing member 30 by a fastener, contains a resin with good slidability, and has a contact part brought into contact with the guide member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an image reading apparatus.

  2. Description of the Related Art A document reading apparatus in which a base member provided on a carriage housing that houses a contact image sensor unit (CIS unit) is configured to come into contact with a guide shaft at three points in the circumferential direction has been conventionally known (for example, , See Patent Document 1).

JP 2005-86482 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image reading apparatus that can suppress rattling during movement of a housing member that houses a reading apparatus main body.

An image reading apparatus according to a first aspect of the present disclosure includes a reading apparatus main body that reads a document placed on a document table, and the reading apparatus main body. The guide member is configured to include a housing member that is supported from the front and moves from one end portion to the other end portion of the document, and a resin that is fastened to a lower surface side of the bottom of the housing member by a fastener and has good slidability. And a guided member having a contact portion that comes into contact with.

In the image reading apparatus according to the second aspect of the present disclosure, the guided member includes an upstream contact portion that contacts the guide member on the upstream side in the moving direction when reading the document, and a downstream side in the moving direction. A downstream contact portion that contacts the guide member.

In the image reading apparatus according to the third aspect of the present disclosure, the upstream contact portion and the downstream contact portion are integrally formed.

In the image reading apparatus according to the fourth aspect of the present disclosure, the fastener is disposed on the downstream side in the movement direction with respect to the upstream contact portion.

In the image reading apparatus according to the fifth aspect of the present disclosure, the fastener is disposed between the upstream contact portion and the downstream contact portion in the movement direction.

In the image reading apparatus according to the sixth aspect of the present disclosure, the guided member is located on a bottom side of the housing member by a fastener different from the fastener on the downstream side of the downstream contact portion in the moving direction. Fastened to the lower surface side.

In the image reading apparatus according to the seventh aspect of the present disclosure, a plurality of the fasteners are provided at different positions in the moving direction when reading the document.

In the image reading apparatus according to the eighth aspect of the present disclosure, the storage member includes a fixed portion fixed to a moving member for moving the storage member, and the fixed portion and the guided member are separated. It is formed as.

In the image reading apparatus according to the ninth aspect of the present disclosure, the housing member has a wall portion having a wall surface facing the moving direction on the upstream side in the moving direction, and the upstream contact in the moving direction. And a support portion that connects between the wall portion and the wall portion.

In the image reading apparatus according to the tenth aspect of the present disclosure, the number of portions of the upstream contact portion and the downstream contact portion that are in contact with the guide member is different from each other.

In the image reading apparatus according to the eleventh aspect of the present disclosure, the guided member includes polyacetal.

An image reading apparatus according to a twelfth aspect of the present disclosure includes a protrusion that is attached to the reading apparatus main body and is positioned in the height direction of the reading apparatus main body by contacting the original table.

According to the image reading apparatus according to the first aspect of the present disclosure, it is possible to obtain an image reading apparatus having good slidability when the accommodating member that accommodates the reading apparatus main body is moved.

According to the image reading apparatus according to the second to twelfth aspects of the present disclosure, it is possible to obtain an image reading apparatus with better sliding property when the accommodating member that accommodates the reading apparatus main body is moved.

It is a perspective view which shows an image reading apparatus. 2 is a perspective view showing the inside of the image reading apparatus. FIG. FIG. 3 is an enlarged cross-sectional view of the image reading apparatus with a part thereof omitted. It is a perspective view which shows the accommodating member which accommodated the reader main body. FIG. 5 is an enlarged cross-sectional view illustrating a part of the housing member that houses the reading device main body, with a part thereof omitted. It is a perspective view which shows the guide member which concerns on 1st Embodiment. (A) It is a side view which shows the plane contact part of the guide member which concerns on 1st Embodiment. (B) It is a side view which shows the curved surface contact part of the guide member which concerns on 1st Embodiment. It is a perspective view which shows the guide member which concerns on 2nd Embodiment. It is a bottom view which shows the guide member which concerns on 2nd Embodiment attached to the accommodating member. It is a side view which shows the modification of the plane contact part of the guide member which concerns on 2nd Embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In each figure, an arrow UP is an upward direction of the image reading apparatus 10, and an arrow FR is a forward direction of the image reading apparatus 10. The arrow RI is the right direction of the image reading device 10 and the sub-scanning direction (the moving direction of the housing member 30) when the reading device main body 50 reads the document placed on the document table 14. The document placed on the document table 14 has a longitudinal direction in the left-right direction.

  As shown in FIG. 1, the image reading apparatus 10 has a document table 14 on which an original is placed on the upper side of a housing 12. The document table 14 is a transparent glass plate formed in a rectangular shape (rectangular shape) whose longitudinal direction is the left-right direction, and is opened and closed by a cover body 16. The cover body 16 is formed in a rectangular shape (rectangular shape) that is slightly larger than the document table 14 and can be opened and closed in the vertical direction by a pair of left and right hinges 15 provided on the rear side of the housing 12. Has been.

  As shown in FIG. 2, inside the housing 12 (below the document table 14), the document placed on the document table 14 is moved in the sub-scanning direction (from one end of the document in the longitudinal direction to the other end). However, a reading device main body (CIS unit) 50 is provided. As shown in FIG. 4, the reading device main body 50 has a length equal to or longer than the length of the document in the short side direction (the direction orthogonal to the longitudinal direction of the original), and is positioned above the reading device main body 50 and has a width. A reading unit 52 along the longitudinal direction of the reading apparatus main body 50 (extending in the longitudinal direction) is provided at the center in the direction (left-right direction, sub-scanning direction).

  The reading device main body 50 is inserted into and accommodated in a housing member (carriage housing) 30 from above. The housing member 30 is a casing whose longitudinal direction is a longitudinal direction (a direction orthogonal to the sub-scanning direction in plan view) (which is longer than the length of the short side of the document), and both ends in the longitudinal direction. The part is supported by a support base 17 (see FIG. 2) formed integrally with the housing 12 so as to be movable.

  As shown in FIGS. 3 to 5, in the substantially central portion in the longitudinal direction on the lower surface side of the bottom wall 32 of the housing member 30, there is a guided member supported and guided by a metal shaft 22 described later. An example guide member 40 is attached. The guide member 40 will be described in detail later.

  In addition, as an example of an engaged portion in which an engaging portion 70 of a spacer 60 described later can be engaged in the height direction (vertical direction) at a substantially central lower portion of the front wall and the rear wall of the housing member 30. The opening 34 is formed. The opening 34 is formed in a rectangular shape whose height direction is the longitudinal direction.

  Further, as shown in FIG. 5, a coil spring 48, which will be described later, is provided at both ends of the upper surface (bottom surface) of the bottom wall 32 on the inner side in the longitudinal direction of the housing member 30 with respect to the opening portion 34. A boss portion 33 into which the lower end portion is fitted is integrally projected. The boss portion 33 is formed in a cross shape in plan view, and is inserted into the annular lower end portion of the coil spring 48 when the reading device main body 50 is accommodated in the accommodating member 30. Yes.

  A spacer 60 as an example of a positioning member is attached to both ends in the longitudinal direction of the reading device main body 50 accommodated in the accommodation member 30. Each spacer 60 has a pair of leg portions 62 (see also FIG. 4), and a claw portion 63 as an example of a locking portion is formed at the lower end portion of the pair of leg portions 62, respectively. A notch portion 53 as an example of a locked portion to which the claw portion 63 is locked is formed at the lower end portions of the left side wall and the right side wall of the reading apparatus main body 50.

  As shown in FIGS. 4 and 5, the upper end portions of the pair of leg portions 62 are integrally connected by a connecting portion 64 having a rectangular flat plate shape. A columnar boss 68 inserted into a boss hole 58 formed at both ends in the longitudinal direction of the upper portion of the reading device main body 50 is formed on the lower surface of the connecting portion 64. , In the sub-scanning direction) and projecting integrally at a predetermined interval.

  Therefore, as shown in FIG. 5, in the spacer 60 provided as a pair of front and rear, each boss portion 68 is inserted into each boss hole 58, and each claw portion 63 formed at the lower end portion of the pair of leg portions 62 includes By being engaged with the respective notches 53 formed in the reading device main body 50, the reading device main body 50 is attached to both ends in the longitudinal direction.

  As shown in FIG. 4, a convex portion 66 having a substantially semicircular shape (substantially semicircular plate shape) when viewed from the longitudinal direction (front-rear direction) of the reading apparatus main body 50 is formed on the upper surface of the connecting portion 64. The reading device main body 50 is integrally protruded with a predetermined interval in the width direction (left-right direction, sub-scanning direction) (a convex portion 66 is formed on the opposite side of the boss portion 68). .

  The pair of convex portions 66 come into slidable contact with the back surface of the document table 14 in a sub-scanning direction and a return direction with a predetermined pressure (biasing force of a coil spring 48 described later) (see FIG. 3). Therefore, the spacer 60 is formed of polyacetal (POM), which is an example of a resin material having good sliding properties with respect to the document table 14.

  Also, as shown in FIG. 4 and FIG. 5, it extends downward in the center in the left-right direction of one side edge (outside in the longitudinal direction of the reading device main body 50) of the connecting portion 64 of the spacer 60. The engaging part 70 is integrally formed. The engaging portion 70 is disposed opposite to the front wall and the rear wall of the reading device main body 50, and the height thereof is higher than the height of the reading device main body 50.

  That is, a lower end portion (a claw portion 72 described later) of the engaging portion 70 protrudes downward from the lower surface of the reading device main body 50. Then, the thickness from the middle to the lower side of the engaging portion 70 is larger than the thickness of the upper side so that the lower end protruding downward from the lower surface of the reading device main body 50 can be elastically deformed in the front-rear direction. Is also formed thin. The lower end portion of the engaging portion 70 can be engaged with the opening 34 of the housing member 30 in the height direction.

  More specifically, a claw portion 72 that protrudes outward in the longitudinal direction of the reading device main body 50 is formed at the lower end portion of the engaging portion 70, and when the reading device main body 50 is accommodated in the accommodating member 30. The claw portion 72 is adapted to engage with the upper side edge portion of the opening 34. Thereby, for example, even when the accommodating member 30 in which the reading device main body 50 is accommodated is dropped when the image reading device 10 is manufactured, the reading device main body 50 is prevented from dropping from the accommodating member 30. ing.

  Further, as shown in FIG. 5, a coil spring 48 as an example of an urging member is provided between both ends of the lower surface of the reading apparatus main body 50 and both ends of the upper surface (bottom surface) of the bottom wall 32 of the housing member 30. Is provided. More specifically, the upper and lower ends of the coil springs 48 provided as a pair of front and rear are attached to both lower end portions of the reading device main body 50, and when the reading device main body 50 is accommodated in the accommodating member 30, the lower end portion Is fitted to the bosses 33 projecting from both ends of the upper surface (bottom surface) of the bottom wall 32 of the housing member 30.

  Each coil spring 48 is disposed immediately below each convex portion 66 when viewed from the sub-scanning direction. In other words, each convex portion 66 is disposed immediately above each coil spring 48 as viewed from the sub-scanning direction. Thus, each spacer 60 is configured to be efficiently urged upward by the urging force (elastic restoring force) of each coil spring 48 to come into contact with the back surface of the document table 14. Therefore, the position of the reading device main body 50 in the height direction with respect to the document table 14 is accurately positioned by the convex portions 66.

  As shown in FIG. 2, a moving mechanism 20 that moves the reading device main body 50 (the housing member 30) in the sub-scanning direction is provided inside the housing 12. More specifically, the moving mechanism 20 has a shaft 22 as an example of a columnar guide member provided in a substantially central portion in the front-rear direction in the housing 12 with the left-right direction (sub-scanning direction) as an axial direction. Yes. The shaft 22 has both left and right end portions fixed to a support portion 18 formed integrally with the left and right end portions in the housing 12, and the housing member 30 in which the reading device main body 50 is housed is moved in the sub-scanning direction ( It is supported so as to be movable in the right direction) and in the opposite return direction (left direction).

  The moving mechanism 20 includes a timing pulley 24 provided on the right end portion (one axial end portion of the shaft 22) side in the housing 12 and a left end portion (the other axial end portion of the shaft 22) in the housing 12. A timing pulley 26 provided on the side, and a timing belt 28 as an example of a moving member wound around the timing pulley 24 and the timing pulley 26 so as to mesh with meshing teeth 28A formed on the inner peripheral surface. And a drive motor (not shown) provided coaxially with one (for example, the right side) timing pulley 24 and rotating the timing pulley 24 in both forward and reverse directions.

  Accordingly, when the timing pulley 24 is rotated in both forward and reverse directions by driving of the drive motor, one side of the timing belt 28 is moved in the sub-scanning direction, and the other side is moved in the return direction. That is, the front and rear one side and the front and rear other side of the timing belt 28 move in the opposite directions in synchronization with each other. The accommodating member 30 is attached to the front timing belt 28, for example.

  More specifically, as shown in FIGS. 3 and 5, the timing belt 28 is meshed with the longitudinally central portion (rear side of the guide member 40) on the lower surface side of the bottom wall 32 adjacent to the guide member 40. A meshing portion 38 as an example of a fixing portion that meshes with the teeth 28 </ b> A is integrally formed. The meshing portion 38 is formed in a rectangular block shape, and a gap larger than the thickness of the timing belt 28 is formed in the central portion of the lower end. A meshing tooth 38 </ b> A is formed on the inner surface of one (rear side in the present embodiment) in the gap of the meshing portion 38.

  Therefore, as shown in FIG. 3, the front side of the timing belt 28 is inserted into the gap of the meshing portion 38, and the front meshing tooth 28 </ b> A meshes with the meshing tooth 38 </ b> A, so that the housing member 30 is interposed via the meshing portion 38. The timing belt 28 is fixed in the circumferential direction. As a result, the accommodating member 30 is moved in the sub-scanning direction and the return direction while being supported by the shaft 22 and the support base 17 as the timing belt 28 moves.

  As shown in FIG. 2, a flexible cable 36 for sending image data read by the reading device main body 50 is provided in the housing 12 on the rear side of the timing belt 28. One end 36 </ b> A of the cable 36 is connected to the reading device main body 50. The flexible cable 36 can follow the movement of the housing member 30 that houses the reader main body 50.

<First Embodiment>
Here, the guide member 40 according to the first embodiment will be described in detail. As shown in FIGS. 3 to 5, the guide member 40 is formed of polyacetal (POM), which is an example of a resin material having good slidability with the shaft 22, and the bottom wall 32 of the housing member 30. Is attached to a substantially central portion in the longitudinal direction on the lower surface side by a fastener such as a screw (not shown). Therefore, as shown in FIG. 6, holes 41 through which fasteners such as screws are passed are formed at a plurality of predetermined positions (for example, four) of the guide member 40.

  Further, the guide member 40 is formed with a concave groove portion 42 extending in the axial direction of the shaft 22, and as shown in FIGS. 6 and 7B, an upstream in the sub-scanning direction in the concave groove portion 42. A first receiving portion 44 having a substantially inverted “U” shape as viewed in the sub-scanning direction is integrally formed at the side end portion. As shown in FIGS. 3 and 5A to 7A, the downstream end in the sub-scanning direction in the groove 42 has a substantially inverted “V” shape when viewed from the sub-scanning direction. The second receiving portion 46 is integrally formed.

  The first receiving portion 44 and the second receiving portion 46 in the recessed groove portion 42 are respectively placed on the outer peripheral surface of the shaft 22 from above, so that the substantially central portion in the longitudinal direction of the housing member 30 is supported by the shaft 22. . As shown in FIG. 7B, the first receiving portion 44 has a curved contact portion 45 that comes into contact with the outer peripheral surface of the shaft 22 at one point in the circumferential direction when viewed from the sub-scanning direction. As shown in FIG. 7A, the second receiving portion 46 has a pair of flat contact portions 47 that come into contact with the outer peripheral surface of the shaft 22 at two points in the circumferential direction when viewed from the sub-scanning direction. Yes.

  More specifically, as shown in FIGS. 6 and 7B, the first receiving portion 44 has a curvature smaller than the curvature of the shaft 22 when viewed from the sub-scanning direction (the radius of curvature of the shaft 22). The uppermost end portion of the arc surface 44A is a curved contact portion 45 that contacts the uppermost end portion of the outer peripheral surface of the shaft 22.

  On the other hand, as shown in FIGS. 6 and 7A, the second receiving portion 46 is inclined at a predetermined angle when viewed from the sub-scanning direction and passes through the center of the shaft 22 in the vertical direction. A pair of inclined surfaces 46 </ b> A that are line-symmetric with respect to each other are provided, and a part of each inclined surface 46 </ b> A is a flat contact portion 47 that contacts the upper side of the outer peripheral surface of the shaft 22.

  Further, as shown in FIG. 6, the guide member 40 has a plurality of sheets (for example, 8) for reinforcing the concave groove portions 42 (the first receiving portion 44 and the second receiving portion 46) outside the concave groove portion 42. Sheet) ribs 43 are integrally formed. In addition, as FIG. 7 shows, each rib 43 is formed in the right triangle shape, However, It is not limited to this shape.

  Further, it is desirable that the timing belt 28 be as close to the shaft 22 as possible in order to improve the movement accuracy of the housing member 30. Therefore, as shown in FIGS. 3 and 5, the rib 43 on the side (rear side) where the timing belt 28 is disposed does not interfere with the meshing portion 38 (front side). It is formed smaller than.

  Next, the operation of the image reading apparatus 10 including the guide member 40 according to the first embodiment configured as described above (movement of the reading apparatus main body 50 (housing member 30) in the sub-scanning direction) will be described. To do.

  After the document is placed on the document table 14 and the cover body 16 is closed, reading of the document is started by operating an operation panel (not shown). That is, the housing member 30 that houses the reading device main body 50 moves in the sub-scanning direction. Here, a second receiving portion 46 is formed at the downstream end of the guide member 40 in the sub-scanning direction, and a pair of planar contact portions 47 in the second receiving portion 46 are viewed from the sub-scanning direction. Point contact is made with the outer peripheral surface of the shaft 22 (see FIG. 7A).

  That is, the second receiving portion 46 is in contact with the shaft 22 at two points in the circumferential direction by the pair of flat contact portions 47. Therefore, the guide member 40 (second receiving portion 46) is supported on the shaft 22 with high positional accuracy (without shifting in a direction intersecting the axial direction of the shaft 22 in plan view). Therefore, rattling (vibration) of the reading device main body 50 (housing member 30) when moving in the sub-scanning direction along the shaft 22 is suppressed or prevented.

  In addition, a first receiving portion 44 is formed at the upstream end of the guide member 40 in the sub-scanning direction, and the curved surface contact portion 45 in the first receiving portion 44 is seen from the sub-scanning direction. Point contact is made on the outer peripheral surface at one point in the circumferential direction (see FIG. 7B). Therefore, even if the position in the direction intersecting the axial direction of the shaft 22 is shifted between the first receiving portion 44 and the second receiving portion 46 due to an error in forming the guide member 40, the first receiving portion 44 The deviation is allowed.

  In other words, even if the position in the direction intersecting the axial direction of the shaft 22 is shifted between the first receiving portion 44 and the second receiving portion 46 due to an error in forming the guide member 40, the shaft 22 in a plan view. In contrast, the guide member 40 (accommodating member 30) does not tilt. Therefore, rattling (vibration) of the reading device main body 50 (housing member 30) when moving in the sub-scanning direction along the shaft 22 is suppressed or prevented. That is, the housing member 30 that houses the reading device main body 50 moves smoothly in the sub-scanning direction.

<Second Embodiment>
Next, the guide member 40 according to the second embodiment will be described in detail. In addition, the same code | symbol is attached | subjected to the site | part equivalent to the guide member 40 which concerns on 1st Embodiment, and detailed description (a common effect | action is also included) is abbreviate | omitted suitably.

  As shown in FIGS. 8 and 9, the guide member 40 includes a second receiving portion 46 having a pair of plane contact portions 47 (see FIG. 10), which is downstream in the sub-scanning direction in the axial direction of the shaft 22. It is formed not only at the end portion but also at a position overlapping (overlapping) the meshing portion 38. That is, the guide member 40 is formed with a plurality (two sets) of a pair of flat contact portions 47.

  Since the guide member 40 having such a configuration is supported on the shaft 22 with higher positional accuracy (without shifting in a direction crossing the axial direction of the shaft 22 in plan view), the sub-scanning direction along the shaft 22 is supported. The rattling (vibration) of the reading device main body 50 (accommodating member 30) when moving to is further suppressed or prevented.

  Note that the shape of the second receiving portion 46 viewed from the sub-scanning direction is not limited to a substantially inverted “V” shape, and may be a shape as shown in FIG. 10, for example. That is, the uppermost end portion of the second receiving portion 46 between the pair of flat contact portions 47 is a flat surface 46B that is not in contact with the uppermost end portion of the outer peripheral surface of the shaft 22 (see also FIGS. 8 and 9). It may be a shape.

  Further, at least one pair of the second receiving portions 46, that is, the pair of flat contact portions 47, is formed in a region downstream from the meshing portion 38 (including the meshing portion 38) in the sub-scanning direction in the axial direction of the shaft 22. In particular, it is desirable to form at least the downstream end portion in the sub-scanning direction in the concave groove portion 42 (guide member 40).

  In addition, at least one first receiving portion 44, that is, curved contact portion 45, is formed in a region upstream of the meshing portion 38 (excluding the meshing portion 38) in the sub-scanning direction in the axial direction of the shaft 22. Good. That is, it is desirable that not only the second receiving portion 46 but also both the first receiving portion 44 and the second receiving portion 46 are formed on the guide member 40.

The image reading apparatus 10 according to the present embodiment has been described with reference to the drawings. However, the image reading apparatus 10 according to the present embodiment is not limited to the illustrated one and does not depart from the gist of the present invention. The design can be changed as appropriate. For example, the moving member that moves the housing member 30 is not limited to the timing belt 28, and the fixed portion that is fixed to the moving member is not limited to the meshing portion 38 that meshes with the timing belt 28. .
The matters described in [Claims] and [Effects of the Invention] immediately before the division in the original application of the present application are as follows.
[Claim 1]
A reader body for reading a document placed on a document table;
An accommodating member that accommodates the reading device main body and is supported from below by a cylindrical guide member and moves from one end portion to the other end portion of the original document when reading the original document;
A fixing portion formed on the housing member and fixed to a moving member for moving the housing member;
A pair of planar contact portions that are provided at substantially the center in the longitudinal direction of the housing member and contact the guide member at two points in the circumferential direction when viewed from the moving direction of the housing member, in the axial direction of the guide member, A guided member formed in a region on the downstream side in the moving direction of the housing member when the original is read from the fixed portion;
With
The guided member has a curved contact portion that contacts the guide member at one point in the circumferential direction when viewed from the moving direction of the housing member, and the curved contact portion is in the axial direction of the guide member, An image reading device formed in a region on the upstream side of the moving direction of the housing member when reading the original from a fixed portion.
[Claim 2]
The image reading apparatus according to claim 1, wherein the pair of planar contact portions are formed at least at a downstream end portion in the moving direction of the guided member.
[Claim 3]
The said guided member has two or more sets of said pair of plane contact parts, and one set is formed in the position which overlaps with the said fixing | fixed part in the axial direction of the said guide member. The image reading apparatus described in 1.
[Claim 4]
The guided member includes a groove portion extending in the axial direction of the guide member and having the planar contact portion and the curved contact portion.
A plurality of ribs for reinforcing the groove portion are formed outside the groove portion, and the rib on the moving member side is formed smaller than the rib on the opposite side. The image reading apparatus according to any one of the above.
According to the first aspect of the present invention, the pair of flat contact portions that contact the guide member at two points in the circumferential direction are downstream in the moving direction of the housing member when reading the document from the fixed portion in the axial direction of the guide member. Compared to a configuration that is not formed in the region on the side, rattling during movement of the housing member that houses the reader main body can be suppressed. In addition, the curved surface contact portion that contacts the guide member at one point in the circumferential direction is not formed in a region upstream of the moving direction of the housing member when reading the document with respect to the fixed portion in the axial direction of the guide member. In comparison, even when the flat contact portion and the curved contact portion are displaced in a direction intersecting the axial direction of the guide member due to a molding error, the backlash at the time of movement of the housing member housing the reading device main body is reduced. Can be suppressed.
According to the second aspect of the present invention, the pair of planar contact portions of the accommodating member that accommodates the reading device main body is compared with a configuration in which the pair of planar contact portions is not formed at the downstream end of the accommodating member in the moving direction of the accommodating member. Shaking during movement can be suppressed.
According to the invention described in claim 3, compared to a configuration in which one set of the pair of planar contact portions formed in a plurality of sets is not formed at a position overlapping with the fixed portion in the axial direction of the guide member, Shaking at the time of movement of the housing member that houses the reader main body can be suppressed.
According to the fourth aspect of the present invention, the groove portion is reinforced without interfering with the fixed portion as compared with the configuration in which the rib on the moving member side is not formed smaller than the rib on the opposite side. Can do.

DESCRIPTION OF SYMBOLS 10 Image reading apparatus 14 Document stand 22 Shaft (an example of a guide member)
28 Timing belt (an example of a moving member)
30 accommodating member 38 meshing part (an example of a fixing part)
40 Guide member (an example of a guided member)
45 Curved surface contact portion 47 Plane contact portion 50 Reader main body

Claims (12)

A reader body for reading a document placed on a document table;
An accommodating member that accommodates the reading device main body and is supported from below by a cylindrical guide member and moves from one end portion to the other end portion of the original document when reading the original document;
A guided member that is fastened by a fastener to the lower surface side of the bottom of the housing member, includes a resin having good slidability, and has a contact portion that contacts the guide member;
An image reading apparatus comprising:   The guided member includes an upstream contact portion that contacts the guide member on the upstream side in the moving direction when reading the document, and a downstream contact portion that contacts the guide member on the downstream side in the moving direction. The image reading apparatus according to claim 1.   The image reading apparatus according to claim 2, wherein the upstream contact portion and the downstream contact portion are integrally formed.   The image reading apparatus according to claim 2, wherein the fastener is disposed downstream of the upstream contact portion in the movement direction.   The image reading apparatus according to claim 4, wherein the fastener is disposed between the upstream contact portion and the downstream contact portion in the moving direction.   The said guided member is fastened to the lower surface side of the bottom of the said storage member by the fastener different from the said fastener in the downstream rather than the said downstream contact part in the said moving direction. Image reading device.   The image reading apparatus according to claim 2, wherein a plurality of the fasteners are provided at positions different from each other in a moving direction when reading the document.   The said accommodating member is provided with the fixing | fixed part fixed to the moving member for moving the said accommodating member, The said fixing | fixed part and the said to-be-guided member are formed as a different body of Claims 2-7. The image reading apparatus according to claim 1. The housing member has a wall portion having a wall surface facing the moving direction on the upstream side in the moving direction,
The image reading apparatus according to claim 2, further comprising a support portion that connects the upstream contact portion and the wall portion in the moving direction.   10. The image reading apparatus according to claim 2, wherein the number of locations where the upstream contact portion and the downstream contact portion are in contact with the guide member is different from each other.   The image reading apparatus according to claim 1, wherein the guided member includes polyacetal.   12. The image reading device according to claim 1, further comprising a convex portion that is attached to the reading device main body and is positioned in a height direction of the reading device main body by contacting the document table. apparatus.