JP6590604B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus that reads an image on a sheet.

  2. Description of the Related Art Conventionally, an image reading apparatus having an automatic document feeder (ADF) that automatically feeds a document to a platen glass and a scanner main body that reads an image of the document conveyed on the platen glass is known. The ADF is supported by the scanner main body so as to be openable and closable. For example, the ADF requires electric power for driving a roller for feeding a document. For this reason, the image reading apparatus has a cable for electrically connecting the ADF and the scanner main body, and supplies power from the scanner main body to the ADF through this cable.

  2. Description of the Related Art Conventionally, there has been proposed an image reading apparatus provided with a cable guide that guides while housing a cable so that the ADF and the cable do not come into contact with each other when the ADF provided above the scanner main body is opened and closed. reference).

JP 2009-216828 A

  As shown in FIG. 7, the image reading apparatus described in Patent Document 1 has openings 113 and 114 in the vicinity of the hinge portion so that the ADF 112 does not interfere with the cable guide and the scanner main body 111 during the opening / closing operation. . For this reason, there is a problem that foreign matter enters from the openings 113 and 114 and the foreign matter is caught near the cable guide, and the ADF 112 cannot be opened and closed.

  SUMMARY An advantage of some aspects of the invention is that it provides an image reading apparatus that is configured to shield a part of a space in which a cable guide is stored and solves the above-described problems.

In the image reading apparatus, the present invention provides a reading unit having a mounting table on which a sheet is mounted, a sheet reading unit that reads the sheet mounted on the mounting table, and a sheet mounted on the mounting table. A pressure plate unit that presses against the mounting table, is supported by the reading unit so as to be openable and closable around a rotation shaft, and is disposed above the reading unit, and the reading unit and the pressure plate unit A cable guide that stores a cable that electrically connects the pressure plate unit, the pressure plate unit, a notch that forms a space in which the cable guide is stored, and a downward extending from the notch, and An outer wall portion that shields a part of the space and constitutes a part of the exterior of the pressure plate unit, and the outer wall portion is attached to the reading unit when the pressure plate unit is opened and closed. Is configured not to, the cable guide, between the upper mounting portion connected to the pressure plate unit, and the lower mounting portion connected to the reading unit, and the lower mounting portion and the upper attachment portion in the vertical direction And a bent portion that is bent toward the mounting table with respect to the rotating shaft .

In the image reading apparatus, the present invention provides a reading unit having a mounting table on which a sheet is mounted and a sheet reading unit that reads the sheet mounted on the mounting table, and is mounted on the mounting table. A pressure plate unit that presses the sheet against the mounting table, is supported by the reading unit so as to be openable and closable around a rotation axis, and is disposed above the reading unit; the reading unit; A cable guide for storing a cable for electrically connecting the pressure plate unit, the pressure plate unit having a notch for forming a space for storing the cable guide, and the reading unit being closed. The reading unit extends upward so as not to interfere with the rotation trajectory of the notch portion directly below the notch portion of the pressure plate unit in a state and shields a part of the space. Has a projecting portion constituting a part of the exterior of Tsu bets, the protrusion, when the pressure plate unit is opened and closed, is configured so as not to interfere with the pressure plate unit and the cable guide, the cable guide An upper mounting portion connected to the pressure plate unit, a lower mounting portion connected to the reading unit, and positioned between the upper mounting portion and the lower mounting portion in the vertical direction and before the rotating shaft. And a bent portion that bends on the side of the mounting table .

  According to the present invention, the outer wall portion or the protruding portion is configured so as to shield a part of the space in which the cable guide is accommodated and not interfere with the reading unit and the cable guide when the pressure plate unit is opened and closed. Therefore, it is possible to prevent foreign matter from entering the periphery of the cable guide, and to reliably open and close the pressure plate unit.

1 is a perspective view showing an image reading apparatus according to a first embodiment of the present invention. FIG. 3 is a side cross-sectional view illustrating an outer wall portion and a protrusion portion of the image reading apparatus. FIG. 4 is a side cross-sectional view showing an outer wall portion and a protrusion portion of the image reading apparatus when the ADF is in an open state. FIG. 6 is a side cross-sectional view showing an outer wall portion and a protrusion portion of an image reading apparatus when an ADF according to a second embodiment of the present invention is in an open state. FIG. 10 is a side cross-sectional view illustrating an outer wall portion and a protrusion portion of an image reading apparatus when an ADF according to a third embodiment of the present invention is in an open state. 1 is a cross-sectional view showing an image reading apparatus according to a first embodiment of the present invention, which is partially modified. The perspective view which shows the exterior of the hinge part vicinity of the conventional image reading apparatus.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the image reading apparatus 1 includes a document placing glass 105 (mounting table) on which a document is placed, and a document reading unit 106 (sheet reading) that reads the document placed on the document placing glass 105. A reading unit 101 including a reading unit 101. Further, the reading unit 101 includes a platen glass 107 that is a transparent member arranged side by side with the document placement glass 105.

  The image reading apparatus 1 further includes an automatic document feeder 102 (pressure plate unit, hereinafter referred to as ADF) supported by the reading unit 101 through hinge portions 103 and 104 so as to be openable and closable. The ADF 102 presses a document feed table 102 a on which a document is placed, a feed roller (not shown) that feeds a document placed on the document feed table 102 a, and a document placed on the document placement glass 105. And a pressure plate portion 2 to be operated.

  The image reading apparatus 1 can read an image of a document by either one of a scanning reading mode and a fixed reading mode selected by a user. In the case of the flow reading mode, the document placed on the document feed table 102a is automatically fed toward the platen glass 107 by a feed roller (not shown). At this time, the document reading unit 106 is positioned below the platen glass 107, and optically scans and reads an image of the document conveyed on the platen glass 107.

  In the fixed reading mode, the user first opens the ADF 102 and places the document on the document placing glass 105. Then, the user closes the ADF 102 and presses the document by the pressure plate part 2 formed on the lower surface of the ADF 102 to prevent the document from being displaced. An image of the document placed on the document placement glass 105 is optically scanned and read by a document reading unit 106 that moves in parallel to the document placement glass 105 below the document placement glass 105.

  Next, a configuration near the hinge portion of the image reading apparatus 1 will be described. In addition, since the structure of the periphery of the hinge parts 103 and 104 consists of substantially the same structure, only the hinge part 103 side is demonstrated and description of the hinge part 104 side is abbreviate | omitted.

  As shown in FIG. 2, the hinge unit 103 includes a base 201 fixed to the reading unit 101, a movable unit 202 fixed to the ADF 102, and a relay arm 203 connected between the base 201 and the movable unit 202. And having. One end of the relay arm 203 is rotatably connected to the base 201 via a shaft 204 (rotating shaft), and the other end is rotatably connected to the movable portion 202 via a shaft 205. The base 201 is fixed to the mounting surface 11 provided on the upper surface of the reading unit 101, and the movable portion 202 is fixed to the notch 10 that is recessed upward on the lower surface of the ADF 102.

  In the space S formed between the notch 10 and the mounting surface 11, a cable guide 209 that stores a cable 208 that electrically connects the reading unit 101 and the ADF 102 is stored in addition to the hinge 103. ing. The cable guide 209 includes a first guide member 3 constituting the lower part of the cable guide 209 and a second guide member 5 constituting the upper part of the cable guide 209. The first guide member 3 and the second guide member 5 are It has a hollow shape into which the cable 208 can be inserted. The first guide member 3 is rotatably connected to the mounting surface 11 by a shaft portion 6 (lower mounting portion), and the second guide member 5 is fixed to the notch portion 10 by a shaft portion 7 (upper mounting portion). It is rotatably connected to a rib (not shown) provided inside the movable portion 202. The first guide member 3 and the second guide member 5 are rotatably connected via a shaft portion 9 (bent portion), and the shaft portion 9 is closer to the document placement glass 105 than the shaft 204. Be placed. Therefore, the cable guide 209 has a shape bent at the shaft portion 9 located between the shaft portion 6 and the shaft portion 7 in the vertical direction.

  Here, the ADF 102 will be described in detail. The ADF 102 extends downward from the end of the notch 10 opposite to the pressure plate 2 in a direction orthogonal to the document transport direction in the flow reading mode, and shields a part of the space S. It has the outer wall part 12 which comprises some. The outer wall end portion 13 which is the lower end portion of the outer surface exposed to the outside of the outer wall portion 12 is a portion farthest from the shaft 204 in the outer wall portion 12, and the distance L1 between the shaft 204 and the outer wall end portion 13 is the shaft 204. And a distance L2 between the upper surface of the reading unit 101 (for example, the mounting surface 11).

  Next, the reading unit 101 will be described in detail. The reading unit 101 has a protruding portion 15 that extends upward from the mounting surface 11 toward the outer wall portion 12 immediately below the outer wall portion 12 of the ADF 102 in the closed state. The outer wall 12 and the protrusion 15 are provided so that the exterior surface is flush with the ADF 102 when the ADF 102 is in the closed state. A distance L3 between the shaft 204 and the surface of the protrusion 15 is set to be longer than a distance L1 between the shaft 204 and the outer wall end 13, and the protrusion 15 rotates the outer wall 12 due to the rotation of the ADF 102. Does not interfere with the movement trajectory. In other words, the distance L1 between the shaft 204 and the outer wall end portion 13 is set to be shorter than the distance L3 between the shaft 204 and the surface of the protrusion 15.

  Since the first embodiment is configured as described above, as shown in FIG. 3, for example, in the fixed reading mode, the user moves the shaft 204 to expose the document placement glass 105. Open the ADF 102 by turning it upward in the center. At this time, since the outer wall end portion 13 of the ADF 102 is closer to the shaft 204 than the upper surface of the reading unit 101, the outer wall portion 12 enters inside the protrusion 15 and passes above the reading unit 101. Accordingly, the user can open and close the ADF 102 without interfering with the reading unit 101.

  In addition, since the shaft portion 9 of the cable guide 209 is disposed closer to the document placing glass 105 than the shaft 204, a space is created immediately below the shaft 204. As shown in FIG. 3, since the outer wall portion 12 enters this space, the user can open the ADF 102 without, for example, sandwiching the cable guide 209 between the outer wall portion 12 and the reading unit 101.

  As described above, the image reading apparatus 1 includes the outer wall portion 12 and the projection portion 15, and thus prevents foreign matter from entering the space S in which the cable guide 209 is accommodated without damaging the outer wall portion 12 and the cable guide 209. And the platen unit can be opened and closed reliably. Further, since the outer wall 12 and the protrusion 15 are provided so that the outer surface is flush when the ADF 102 is closed, the unevenness of the outer surface of the image reading apparatus 1 can be reduced. , Can improve the appearance.

  The distance between the outer wall 12 and the protrusion 15 is closer to 0 if the outer wall 12 and the protrusion 15 do not interfere with each other when the ADF 102 is rotated. That is, the distance L1 between the shaft 204 and the outer wall end portion 13 is preferably shorter than the distance L3 between the shaft 204 and the surface of the protrusion 15 and closer to the distance L3.

  Then, after opening the ADF 102, the user places a document on the exposed document placement glass 105. Further, the user rotates the ADF 102 downward about the shaft 204 to close it, presses the document against the document placement glass 105 by the pressure plate unit 2, and positions the document. In this state, the user starts fixed reading of the document.

  The hinge portion 103 has a relay arm 203 whose both ends are rotatably connected by a shaft 204 and a shaft 205, and a movable portion 202 connected to the relay arm via a shaft 205. For this reason, the thickness of the document placed on the document placement glass 105 is absorbed by the elevation angle of the relay arm 203 when it is closed and the rotation angle of the movable portion 202 relative to the relay arm 203. That is, for a thick document, the elevation angle of the relay arm 203 when the ADF 102 is closed is large, and for a thin document, the elevation angle of the relay arm 203 is small. In addition, regardless of the elevation angle of the relay arm 203, the movable portion 202 can be rotated to make the pressure plate portion 2 parallel to the document placement glass 105. As a result, regardless of the thickness of the document placed on the document placement glass 105, the pressure plate unit 2 can surely press the entire upper surface of the document, thereby reliably preventing the displacement of the document. it can. It should be noted that the space between the first guide member 3 and the second guide member 5 in the cable guide 209 is such that the rotation trajectory of the outer wall portion 12 and the cable guide even when the document is not placed on the document placement glass 105. 209 is set so as not to interfere.

<Second Embodiment>
Subsequently, a second embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to 1st Embodiment, illustration is abbreviate | omitted or attaches | subjects the same code | symbol to a figure and abbreviate | omits description. The reading unit 101 </ b> A of the image reading apparatus 1 </ b> A has a protruding portion 15 </ b> A that extends upward from the mounting surface 11 toward the outer wall portion 12 immediately below the outer wall portion 12 of the ADF 102 in the closed state.

  The projecting portion 15 </ b> A constitutes an upper surface thereof, and has an inclined surface 16 that is inclined downward from the outer end portion 19 far from the document placement glass 105 toward the inner end portion 21. The inclined surface 16 is formed such that the distance from the shaft 204 is closest to the end portion 19, and the distance L4 between the shaft 204 and the surface of the protrusion 15 </ b> A is the distance between the shaft 204 and the end portion 19. . Since the distance L4 is set to be longer than the distance L1 between the shaft 204 and the outer wall end portion 13 described above, the protruding portion 15A does not interfere with the rotation trajectory of the outer wall portion 12.

  In the present embodiment, as described above, since the protrusion 15A has the inclined surface 16, the outer end 19 of the protrusion 15A can be brought closer to the outer wall end 13. Thereby, the clearance gap between the outer wall part 12 and the projection part 15A can be made smaller than 1st Embodiment, and the penetration | invasion of a foreign material can be prevented more.

  Further, the strength of the protrusion 15A can be improved by reducing the inclination angle of the inclined surface 16 within a range that does not interfere with the rotation trajectory of the outer wall portion 12. At this time, as shown in FIG. 4, the notch 201 a is formed in the base 201 so that the base of the protrusion 15 </ b> A does not interfere with the base 201, so that the inclined surface 16 is inclined more gently. The strength of 15A can be further improved.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to 2nd Embodiment, illustration is abbreviate | omitted or attaches | subjects the same code | symbol to a figure and abbreviate | omits description. The reading unit 101 </ b> B of the image reading apparatus 1 </ b> B has a protruding portion 15 </ b> B extending upward from the mounting surface 11 toward the outer wall portion 12 immediately below the outer wall portion 12 of the ADF 102 in the closed state.

  The projecting portion 15B constitutes the upper surface, and the inner end portion 41 is disposed below the outer end portion 39 far from the document placing glass 105, and has a curved surface 36 that is recessed downward. The curved surface 36 is formed in an arc shape centered on the shaft 204, and the distance L5 between the shaft 204 and the surface of the protrusion 15B is the distance between the shaft 204 and the curved surface 36. Since the distance L5 is set to be longer than the distance L1 between the shaft 204 and the outer wall end portion 13 described above, the protrusion 15B does not interfere with the rotation trajectory of the outer wall portion 12.

  In the present embodiment, as described above, the protruding portion 15B has the curved surface 36 that is recessed downward, so that the protruding portion 15B can be brought closer to the outer wall end portion 13. Thereby, the clearance gap between the outer wall part 12 and the projection part 15B can be made smaller than 1st Embodiment, and the penetration | invasion of a foreign material can be prevented more.

  Further, in the present embodiment, since the arcuate curved surface 36 centered on the shaft 204 is formed on the projection 15B, the outer wall 12 and the projection 15B can be obtained even when the ADF 102 is held open. Can be provided close to each other. Thereby, even when the ADF 102 is in the open state, foreign matter can be prevented from entering the space S, and the foreign matter can be prevented from opening and closing the ADF 102, and the ADF 102 can be opened and closed reliably.

  In the first to third embodiments, the image reading apparatuses 1, 1A, and 1B having the outer wall portion 12 and the protrusion 15 have been described. However, the present invention is not limited to this. That is, the present invention can be applied even to the image reading apparatuses 1, 1A, 1B having only the outer wall portion 12. In addition, the image reading apparatus 1, which has only the protrusion 15 and the distance between the shaft 204 and the end exposed to the outside of the notch 10 is shorter than the distance between the shaft 204 and the upper surface of the reading unit 101. The present invention is also applicable to 1A and 1B.

  In the second and third embodiments of the present invention, the image reading apparatuses 1A and 1B in which the upper surface of the protrusion 15 is configured by the inclined surface 16 or the curved surface 36 have been described. However, the present invention is not limited to this. That is, the lower surface of the outer wall portion 12 may be configured by an inclined surface that is inclined downward from the outer end far from the pressure plate portion 2 toward the inner end. Moreover, the lower surface of the outer wall part 12 may be comprised from the bulging curved surface by which an inner edge part is arrange | positioned below rather than an outer edge part.

<Modification of the first embodiment>
Here, referring to FIG. 6, an image reading apparatus 1 </ b> C obtained by partially modifying the first embodiment of the present invention will be described. The image reading apparatus 1 </ b> C has an outer wall portion 12 and a protrusion portion 15, and a protrusion end portion 59 that is an upper end portion of an outer surface exposed to the outside of the protrusion portion 15 is a portion farthest from the shaft 204 in the protrusion portion 15. is there. A distance L6 between the shaft 204 and the protruding end portion 59 is set to be shorter than a distance L7 between the shaft 204 and the lower surface of the ADF 102 (for example, the lower surface of the outer wall portion 12). For this reason, when the ADF 102 of the image reading apparatus 1C is opened, the outer wall 12 moves to the outside of the reading unit 101 as shown by the two-dot chain line in FIG. The ADF 102 can be opened and closed.

  Although the image reading apparatus 1C having the outer wall portion 12 and the projection portion 15 has been described in the first embodiment of the present invention that is partially modified, the present invention is not limited to this. That is, the image reading apparatus 1 </ b> C has only the outer wall portion 12 and the distance between the shaft 204 and the end portion exposed to the outside of the mounting surface 11 is shorter than the distance L <b> 7 between the shaft 204 and the lower surface of the ADF 102. The invention is applicable. The present invention is also applicable to the image reading apparatus 1 </ b> C that includes only the protrusion 15 and has a distance L <b> 6 between the shaft 204 and the end portion 59 that is shorter than the distance between the shaft 204 and the lower surface of the ADF 102.

  In the first embodiment of the present invention that is partially deformed, the upper surface of the projection 15 is composed of an inclined surface that is inclined upward from an outer end far from the document placing glass 105 toward an inner end. May be. Moreover, you may comprise the upper surface of the projection part 15 from the bulging curved surface by which an inner edge part is arrange | positioned upwards from an outer edge part. Furthermore, you may comprise the lower surface of the outer wall part 12 from the inclined surface which inclines upward toward the inner edge part from the outer edge part far from the pressure plate part 2. FIG. Moreover, you may comprise the lower surface of the outer wall part 12 from the concave curved surface by which an inner edge part is arrange | positioned upwards from an outer edge part.

  The ADF 102 in the first to third embodiments of the present invention may be a pressure plate unit that does not have an automatic document feed function. For example, the ADF 102 may not be provided with the document feed base 102a but may be formed in a flat plate shape.

  In the first to third embodiments of the present invention described above, the ADF 102 feeds a document and the document reading unit 106 reads the image of the document. However, the present invention is not limited to this. That is, the ADF 102 may feed a sheet made of white paper or a document, or other materials such as plastic or metal, not limited to paper, and the document reading unit 106 reads an image of such a sheet. Also good.

DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C: Image reading apparatus, 2: Pressure plate part, 10: Notch part, 12: Outer wall part, 15, 15A, 15B: Protrusion part, 16: Inclined surface, 36: Curved surface, 101, 101A , 101B: reading unit, 102: pressure plate unit (automatic document feeder, ADF), 105: placing table (document placing glass), 106: sheet reading unit (document reading unit), 204: rotating shaft (axis), 208: Cable, 209: Cable guide, L1, L2, L3, L4, L5, L6, L7: Distance, S: Space

Claims (8)

A reading unit having a mounting table on which the sheet is mounted, and a sheet reading unit that reads the sheet mounted on the mounting table;
A pressure plate unit having a pressure plate portion that presses the sheet placed on the placement table against the placement table, supported by the reading unit so as to be openable and closable around a rotation shaft, and disposed above the reading unit. When,
A cable guide for storing a cable for electrically connecting the reading unit and the pressure plate unit;
The pressure plate unit includes a notch that forms a space in which the cable guide is stored;
An outer wall portion extending downward from the notch portion and shielding a part of the space to constitute a part of the exterior of the pressure plate unit,
The outer wall portion is configured not to interfere with the reading unit when the pressure plate unit is opened and closed .
The cable guide is located between the upper mounting portion and the lower mounting portion in the vertical direction and the upper mounting portion connected to the pressure plate unit, the lower mounting portion connected to the reading unit, and the rotation A bending portion that bends toward the mounting table before the shaft,
An image reading apparatus. The reading unit has a protruding portion that extends upward toward the outer wall portion so as not to interfere with the rotation trajectory of the outer wall portion immediately below the outer wall portion of the pressure plate unit in the closed state.
The image reading apparatus according to claim 1. The distance between the rotation shaft and the outer wall end portion of the outer wall portion farthest from the rotation shaft is shorter than the distance between the rotation shaft and the upper surface of the reading unit.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The distance between the rotation shaft and the outer wall end portion of the outer wall portion farthest from the rotation shaft is set shorter than the distance between the rotation shaft and the upper surface of the protrusion,
At least one of the lower surface of the outer wall portion and the upper surface of the protrusion has an inclined surface that is inclined downward from an outer end far from the mounting table toward an inner end.
The image reading apparatus according to claim 2. The distance between the rotation shaft and the outer wall end portion of the outer wall portion farthest from the rotation shaft is set shorter than the distance between the rotation shaft and the upper surface of the protrusion,
At least one of the lower surface of the outer wall portion and the upper surface of the protruding portion has a curved surface in which the inner end portion is disposed below the outer end portion far from the mounting table.
The image reading apparatus according to claim 2. A reading unit having a mounting table on which the sheet is mounted, and a sheet reading unit that reads the sheet mounted on the mounting table;
A pressure plate unit having a pressure plate portion that presses the sheet placed on the placement table against the placement table, supported by the reading unit so as to be openable and closable around a rotation shaft, and disposed above the reading unit. When,
A cable guide for storing a cable for electrically connecting the reading unit and the pressure plate unit;
The pressure plate unit has a notch that forms a space in which the cable guide is stored,
The reading unit extends above the notch portion of the pressure plate unit in the closed state so as not to interfere with the rotation trajectory of the notch portion, and shields a part of the space to read the reading unit. Having a protrusion that constitutes a part of the exterior of the
The protrusion is configured not to interfere with the pressure plate unit and the cable guide when the pressure plate unit is opened and closed .
The cable guide is located between the upper mounting portion and the lower mounting portion in the vertical direction and the upper mounting portion connected to the pressure plate unit, the lower mounting portion connected to the reading unit, and the rotation A bending portion that bends toward the mounting table before the shaft,
An image reading apparatus. A hinge portion that supports the pressure plate unit is attached to the reading unit so as to be openable and closable around the rotation shaft.
The hinge part is connected to a base attached to the reading unit, a movable part attached to the pressure plate unit, one end pivotably connected to the base and the pivot shaft, and the other end movable to the movable part. A relay arm that is pivotably connected to the portion, and is housed in the space.
The image reading apparatus according to any one of claims 1 to 6, characterized in that. The reading unit includes a transparent member that allows the sheet reading unit to read an image of a conveyed sheet,
The pressure plate unit is an automatic document feeder that automatically conveys a sheet to the transparent member.
The image reading apparatus according to any one of claims 1 to 7, characterized in that.

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