JP2019080346A - Image reader - Google Patents

Abstract

To provide an image reader capable of suppressing a housing member which houses an image read body from rattling in moving.SOLUTION: There is provided an image reader 10 comprising: a reader body 50 which reads a document placed on a document platen 14; a housing member 30 which houses the reader body 50, and is supported by a columnar guide member 22 from below to move from one end part to the other end part of the document when reading the document; a contact part 60 which is provided upper surfaces of both lengthwise end parts of the reader body 50, and comes into contact with a reverse surface of the document plante 14 to slide; energizing means for pressing the contact part 60 against the reverse surface of the document platen 14; and a guided part 40 having a recessed groove part 42 which is provided at a substantially lengthwise center part of the housing member 30, and extends projecting from a movement-directional downstream end part of the housing part 30 in an axial direction of the guide member 22 beyond a movement-directionally upstream end part of the housing member 30, and a pair of plane contact parts 47 which are formed at a movement-directional downstream end parts of the recessed groove part 42 and come into contact with the guide member 22 at two points in a circumferential direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an image reading apparatus.

  A document reading apparatus has been known in which a base member provided on a carriage housing accommodating a contact image sensor unit (CIS unit) contacts a guide shaft at three points in the circumferential direction (for example, a document reading device) , Patent Document 1).

JP, 2005-86482, A

  An object of the present invention is to obtain an image reading apparatus capable of suppressing rattling at the time of movement of a containing member containing a reading apparatus main body.

  In order to achieve the above object, an image reading apparatus according to claim 1 of the present invention accommodates a reading apparatus main body for reading an original placed on an original table, and the reading apparatus main body, and reads the original When the document is supported from below by a cylindrical guide member and moved from one end to the other end of the document, a storage member provided with a wall surface at the upstream end in the movement direction, and the reading device main body A contact portion provided on the upper surface of both end portions in the longitudinal direction and slidably contacting the back surface of the document table, and provided at a substantially central portion in the longitudinal direction of the receiving member and below the receiving member A recessed groove extending from the downstream end beyond the upstream end of the receiving member, and a downstream end of the recessed groove in the moving direction, and mounted on the guide member, the shaft of the guide member Downstream guided part sliding in the direction An upstream guided portion which is formed on the upstream side of the moving direction with respect to the wall surface in the recessed groove portion and which is mounted on the guiding member and slides in the axial direction of the guiding member, and in the moving direction with respect to the wall surface And a support body connected between the upper surface of the recessed groove portion on the upstream side and the wall surface and extending in the movement direction.

  The image reading apparatus according to claim 2 is the image reading apparatus according to claim 1, wherein the contact portion is pressed against the back surface of the document table, and the downstream guided portion and the guide portion A biasing means is provided to press the upstream guided portion against the guide member.

  According to the first aspect of the present invention, the deformation of the recessed groove can be suppressed.

  According to the second aspect of the present invention, deformation of the recessed groove can be suppressed.

FIG. 2 is a perspective view showing an image reading apparatus. FIG. 2 is a perspective view showing the inside of the image reading apparatus. FIG. 2 is a cross-sectional view showing the inside of the image reading apparatus with a part thereof omitted and enlarged. It is a perspective view which shows the accommodation member which accommodated the reader main body. It is sectional drawing which abbreviate | omits and partially enlarges the accommodation member which accommodated the reader main body. It is a perspective view showing a guide member concerning a 1st embodiment. (A) It is a side view which shows the plane | planar 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 showing a guide member concerning a 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 showing a modification of a plane contact portion of a guide member concerning a 2nd embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail based on the drawings. In each of the drawings, the arrow UP indicates the upward direction of the image reading device 10, and the arrow FR indicates the forward direction of the image reading device 10. Then, the arrow RI is set to the right of the image reading device 10, and is set to the sub-scanning direction (moving direction of the housing member 30) when the reading device main body 50 reads the document placed on the document table 14. Further, the document placed on the document table 14 has the left and right direction as the longitudinal direction.

  As shown in FIG. 1, the image reading apparatus 10 has a document table 14 on which a document 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) in which the left and right direction is the longitudinal direction, and is opened and closed by the cover body 16. The cover 16 is formed in a rectangular shape (rectangular shape) that is slightly larger than the document table 14 and configured to be able to be opened and closed in the vertical direction by a hinge portion 15 provided on the rear side of the housing 12 as a pair. It is done.

  As shown in FIG. 2, the document placed on the document table 14 is moved in the sub scanning direction (from one end to the other end of the document) inside the case 12 (below the document table 14) A reading device main body (CIS unit) 50 is provided while reading. As shown in FIG. 4, the reading device main body 50 has a length equal to or longer than the length of the short side direction of the document (direction orthogonal to the longitudinal direction of the document). At a central portion in the direction (left-right direction, sub-scanning direction), a reading unit 52 extending in the longitudinal direction of the reading device main body 50 is provided.

  The reader main body 50 is inserted from above into the housing member (carriage housing) 30 and housed therein. The housing member 30 is a housing whose longitudinal direction is a longitudinal direction (a direction orthogonal to the sub-scanning direction in plan view) (a length greater than or equal to the length of the document in the lateral direction). The portion is movably supported by a support 17 (see FIG. 2) integrally formed on the housing 12.

  Further, 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, 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.

  Further, as an example of an engaged portion, an engaging portion 70 of a spacer 60 described later can be engaged in the height direction (vertical direction) below the substantially central lower portion of the front and rear walls of the housing member 30 in the left-right direction. The opening 34 is formed. The opening 34 is formed in a rectangular shape whose longitudinal direction is the height direction.

  Further, as shown in FIG. 5, 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 than the opening 34 and near the center in the horizontal direction A boss portion 33 to which the lower end portion is fitted is integrally protruded. The boss portion 33 is formed in a cross shape in a plan view, and is inserted into the annular lower end portion of the coil spring 48 when the reader main body 50 is accommodated in the accommodation member 30. There is.

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

  Further, as shown in FIGS. 4 and 5, the upper end portions of the pair of leg portions 62 are integrally connected by a rectangular flat connection portion 64. Then, on the lower surface of the connecting portion 64, a cylindrical boss portion 68 inserted in boss holes 58 formed in both end portions in the longitudinal direction of the upper portion of the reading device main body 50 is the width direction of the reading device main body In the sub-scanning direction, they are integrally protruded at a predetermined interval.

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

  Further, as shown in FIG. 4, on the upper surface of the connecting portion 64, a convex portion 66 (substantially semi-disc-like) having a substantially semicircular shape as viewed from the longitudinal direction (front-rear direction) of the reading device main body 50 Are integrally projected at predetermined intervals in the width direction (left and right direction, sub scanning direction) of the reading device main body 50 (a convex portion 66 is formed on the opposite side of the boss 68) .

  The pair of convex portions 66 slidably contact the back surface of the document table 14 in the sub scanning direction and the return direction at 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 slidability with the document table 14.

  Further, as shown in FIG. 4 and FIG. 5, it extends downward in the left-right direction central portion of one side (the outer side in the longitudinal direction of the reader main body 50) of the connecting portion 64 of the spacer 60. The engaging portion 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, the lower end portion (the claw portion 72 described later) of the engagement portion 70 protrudes downward from the lower surface of the reading device main body 50. Then, the thickness of the lower side from the middle of the engaging portion 70 is greater than the thickness of the upper side so that the lower end projecting downward from the lower surface of the reading device main body 50 can be elastically deformed in the front and rear direction. It is also thinly formed. The lower end portion of the engaging portion 70 is engageable with the opening 34 of the housing member 30 in the height direction.

  Describing in detail, the lower end portion of the engaging portion 70 is formed with a claw portion 72 projecting outward in the longitudinal direction of the reading device main body 50, and when the reading device main body 50 is accommodated in the housing member 30. The claws 72 engage with the upper side edge of the opening 34. Thus, for example, even when the storage member 30 containing the reading apparatus main body 50 is dropped at the time of manufacturing the image reading apparatus 10, the falling of the reading apparatus main body 50 from the storage member 30 is suppressed or prevented. ing.

  Further, as shown in FIG. 5, coil springs 48 as an example of biasing means are provided between the lower end portions of the reading device main body 50 and the upper end portions (bottom surfaces) of the bottom wall 32 of the housing member 30. It is provided. More specifically, the upper end portion of the coil spring 48 provided as a front and rear pair is attached to the lower end portions of the lower surface of the reading device main body 50, and the lower end portion is accommodated when the reading device main body 50 is accommodated in the accommodation member 30. Is adapted to be fitted to bosses 33 protruding 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 in the sub-scanning direction. In other words, as viewed in the sub-scanning direction, each convex portion 66 is disposed immediately above each coil spring 48. Thus, each spacer 60 is configured to be efficiently urged upward by the urging force (elastic restoring force) of each coil spring 48 and to contact the back surface of the document table 14. Therefore, in the reading device main body 50, the position in the height direction with respect to the document table 14 is accurately positioned by the respective convex portions 66.

  Further, as shown in FIG. 2, a moving mechanism 20 for moving the reading apparatus main body 50 (the housing member 30) in the sub scanning direction is provided inside the housing 12. Describing in detail, the moving mechanism 20 has a shaft 22 as an example of a cylindrical guide member provided in the substantially longitudinal central portion in the front and rear direction in the housing 12 with the left and right direction (sub scanning direction) as the axial direction. There is. The left and right end portions of the shaft 22 are fixed to supporting portions 18 integrally formed at 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 It is movably supported in the right direction) and the return direction (left direction) opposite to that).

  The moving mechanism 20 has a timing pulley 24 provided at the right end (one end in the axial direction of the shaft 22) in the housing 12, and a left end (the other end in the axial direction of the shaft 22) in the housing 12. A timing belt 28 as an example of a moving member in which the meshing teeth 28A formed on the inner peripheral surface are engaged with the timing pulley 26 and the timing pulley 24 and the timing pulley 26 provided on the side. And a drive motor (not shown) coaxially provided with one (for example, right side) timing pulley 24 and rotationally driving the timing pulley 24 in both forward and reverse directions.

  Therefore, when the timing pulley 24 rotates in the forward and reverse directions by the drive of the drive motor, one of the front and rear sides of the timing belt 28 moves in the sub scanning direction, and the other front and rear side moves 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 direction in synchronization with each other. And the accommodation member 30 is attached to the timing belt 28 of the front side, for example.

  Describing in detail, as shown in FIG. 3 and FIG. 5, meshing of the timing belt 28 is achieved at a substantially central portion in the longitudinal direction (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 fixed portion to be meshed with the teeth 28A is integrally formed. The meshing portion 38 is formed in the shape of a rectangular block, and a gap equal to or greater than the thickness of the timing belt 28 is formed in the lower end central portion. Further, on one inner surface (rear side in the present embodiment) in the gap of the meshing portion 38, meshing teeth 38A are formed.

  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 meshing tooth 28A of the front side meshes with the meshing tooth 38A, so that the housing member 30 is engaged via the meshing portion 38 The timing belt 28 is fixed in the circumferential direction. Thus, with the movement of the timing belt 28, the housing member 30 is supported by the shaft 22 and the support 17, and is moved in the sub-scanning direction and the return direction.

  In addition, as shown in FIG. 2, a flexible cable 36 for transmitting image data read by the reading device main body 50 is disposed in the housing 12 on the rear side of the timing belt 28, and the flexible cable 36 is flexible. One end 36 A of the cable 36 is connected to the reader main body 50. The flexible cable 36 can follow the movement of the housing member 30 housing 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 a good slidability with the shaft 22, and the bottom wall 32 of the housing member 30. It is attached by the fasteners, such as a screw which is not illustrated, in the longitudinal direction approximate center part in the undersurface side. Therefore, as shown in FIG. 6, holes 41 through which fasteners such as screws are inserted are formed at a plurality of predetermined (for example, four) positions of the guide member 40.

  Further, the guide member 40 is provided with a recessed groove 42 extending in the axial direction of the shaft 22, and as shown in FIGS. 6 and 7B, the upstream in the sub scanning direction in the recessed groove 42 At the side end, there is integrally formed a first receiving portion 44 which has a substantially reverse "U" shape when viewed from the sub-scanning direction. Then, as shown in FIGS. 3 and 5 to 7A, the downstream end portion in the sub scanning direction in the recessed groove portion 42 has a substantially reverse “V” shape as 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 mounted on the outer peripheral surface of the shaft 22 from above, whereby the substantially central portion in the longitudinal direction of the housing member 30 is supported by the shaft 22 . Then, as shown in FIG. 7B, the first receiving portion 44 has a curved surface contact portion 45 that contacts 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 contact the outer peripheral surface of the shaft 22 at two points in the circumferential direction when viewed from the sub scanning direction. There is.

  Describing in detail, 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 curved surface 44A has a larger radius of curvature, and the uppermost end of the curved surface 44A is a curved contact portion 45 in contact with the uppermost end 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 a straight line in the vertical direction passing through the center of the shaft 22. A pair of inclined surfaces 46A that are line symmetrical with respect to each other is provided, and a part of each of the inclined surfaces 46A 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, in the guide member 40, a plurality of (for example, 8) for reinforcing the recessed groove portions 42 (the first receiving portion 44 and the second receiving portion 46) outside the recessed groove portions 42. The ribs 43 are integrally formed. As shown in FIG. 7, each rib 43 is formed in a right triangle shape, but is not limited to this shape.

  Further, it is desirable for the timing belt 28 to be as close as possible to the shaft 22 in order to improve the movement accuracy of the housing member 30. Therefore, as shown in FIG. 3 and FIG. 5, the rib 43 on the side (rear side) on which the timing belt 28 is disposed does not interfere with the meshing portion 38, the rib 43 on the opposite side (front side) It is smaller than that. In addition, the substantially rectangular flat-plate shaped rib 39 as an example of the reinforcement part which reinforces the meshing part 38 is integrally provided in the both-sides wall of the meshing part 38 (also refer FIG. 9).

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

  After the original is placed on the original table 14 and the cover 16 is closed, the reading of the original is started by operating the operation panel (not shown). That is, the accommodation member 30 accommodating the reading device main body 50 moves in the sub scanning direction. Here, the second receiving portion 46 is formed at the downstream end portion of the guide member 40 in the sub scanning direction, and the pair of flat contact portions 47 in the second receiving portion 46 is viewed from the sub scanning direction. They are in point contact 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 by the shaft 22 with high positional accuracy (without being displaced in the direction intersecting with the axial direction of the shaft 22 in a plan view). Therefore, rattling (vibration) of the reading device main body 50 (the housing member 30) when moving in the sub scanning direction along the shaft 22 is suppressed or prevented.

  Moreover, the first receiving portion 44 is formed at the upstream side end portion of the guide member 40 in the sub scanning direction, and the curved surface contact portion 45 in the first receiving portion 44 of the shaft 22 is viewed from the sub scanning direction. The outer peripheral surface is in point contact with one point in the circumferential direction (see FIG. 7 (B)). Therefore, even if the positions of the first receiving portion 44 and the second receiving portion 46 in the direction intersecting with the axial direction of the shaft 22 are deviated due to a molding error of the guide member 40, the first receiving portion 44 The deviation is acceptable.

  In other words, even if the positions of the first receiving portion 44 and the second receiving portion 46 in the direction intersecting with the axial direction of the shaft 22 are deviated due to a molding error of the guide member 40, the shaft 22 in plan view The guide member 40 (the housing member 30) does not tilt relative to the above. Therefore, rattling (vibration) of the reading device main body 50 (the housing member 30) when moving in the sub scanning direction along the shaft 22 is suppressed or prevented. That is, the housing member 30 housing 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. Note that portions equivalent to those of the guide member 40 according to the first embodiment are denoted by the same reference numerals, and detailed description (including common actions) is appropriately omitted.

  As shown in FIGS. 8 and 9, in the guide member 40, the second receiving portion 46 having a pair of flat contact portions 47 (see FIG. 10) is located downstream in the sub scanning direction in the axial direction of the shaft 22. It is formed not only at the end but also at a position where it overlaps the meshing portion 38 (overlap). That is, a plurality of (two) pairs of flat contact portions 47 are formed on the guide member 40.

  With the guide member 40 having such a configuration, it is supported on the shaft 22 with high positional accuracy (without shifting in a direction intersecting with the axial direction of the shaft 22 in plan view). Shatter (vibration) of the reading device main body 50 (the housing member 30) when moving to the side is further suppressed or prevented.

  The shape of the second receiving portion 46 as viewed in the sub-scanning direction is not limited to the substantially reverse “V” shape, and may be, for example, a shape as shown in FIG. 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 (see also FIGS. 8 and 9) which is not in contact with the uppermost end portion of the outer peripheral surface of the shaft 22. It may be shaped.

  Further, at least one pair of second receiving portions 46, that is, a pair of flat contact portions 47, is formed in the region on the downstream side in the sub scanning direction (including the engaging portion 38) from the engaging portion 38 in the axial direction of the shaft 22. In particular, it is preferable that at least the downstream end portion in the sub scanning direction in the recessed groove portion 42 (the guide member 40) be formed.

  In addition, at least one first receiving portion 44, that is, the curved surface contact portion 45 is formed in the region on the upstream side in the sub scanning direction (except the meshing portion 38) with respect to the meshing portion 38 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 be formed in the guide member 40.

  As mentioned above, although the image reading apparatus 10 which concerns on this embodiment was demonstrated based on drawing, the image reading apparatus 10 which concerns on this embodiment is not limited to a thing of illustration, The range which does not deviate from the summary of this invention The design can be changed as appropriate. For example, the moving member for moving the housing member 30 is not limited to the timing belt 28, and the fixing portion fixed to the moving member is not limited to the meshing portion 38 engaged with the timing belt 28. .

10 Image Reading Device 14 Document Table 22 Shaft (Example of Guide Member)
28 Timing Belt (Example of moving member)
30 housing member 38 meshing portion (an example of a fixing portion)
39 Ribs (an example of reinforcement)
40 Guide member (an example of a guided portion)
42 concave groove portion 45 curved surface contact portion 47 flat surface contact portion 48 coil spring (an example of biasing means)
50 Reader main body 60 Spacer (an example of contact part)

Claims (2)

A reading device main body that reads a document placed on a document table;
When the main body of the reading apparatus is accommodated and the original is read, it is supported from below by a cylindrical guide member and moves from one end to the other end of the original, and a wall surface is provided at the upstream end in the movement direction A storage member provided;
A contact portion provided on the upper surface of both end portions in the longitudinal direction of the reading device main body and slidably contacting the back surface of the document table;
A recessed groove portion which is provided at a substantially central portion in the longitudinal direction of the housing member and below the housing member and extends from the downstream end of the housing member beyond the upstream end of the housing member;
A downstream guided portion which is formed at the downstream end of the recessed groove portion in the moving direction, and which is mounted on the guiding member and slides in the axial direction of the guiding member;
An upstream guided portion which is formed on the upstream side of the moving direction with respect to the wall surface in the recessed groove portion, and which is mounted on the guiding member and slides in the axial direction of the guiding member;
A support that connects the upper surface of the recessed groove portion on the upstream side in the movement direction with respect to the wall surface and the wall surface and extends in the movement direction;
Image reader equipped with   The urging device according to claim 1, further comprising urging means for pressing the contact portion against the back surface of the document table and pressing the downstream guided portion and the upstream guided portion against the guiding member. Image reader.