JP5682374B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus capable of reading an image of a document placed on a document placement table.

  2. Description of the Related Art Conventionally, there has been known an image reading apparatus that includes a document placing table having a transparent member such as a glass plate provided on an upper surface and can read an image of a document placed on a transparent member. Many of such image reading apparatuses include a rotatable document cover above the document table. The user places the document on the transparent member in a state where the document cover is rotated upward, that is, in a state where the document cover is opened. Thereafter, the user rotates the document cover downward. As a result, the transparent member and the document are covered with the document cover. In this state, the image of the document is read by an image sensor disposed below the transparent member.

  However, in the image reading apparatus configured as described above, the position of the document placed on the transparent member may be shifted due to the wind pressure generated when the document cover is rotated. In order to prevent such a problem, for example, Patent Document 1 discloses a document reading apparatus provided with a second document cover that holds only a part of a document in addition to the document cover described above. In the document reading apparatus, a part of the document can be pressed by the second document cover after the document is placed on the document placing table and before the document cover is rotated. Thereby, even if wind pressure is generated when the document cover is rotated, it is possible to prevent the position of the document from being shifted.

Sho 62-47267

  However, in the document reading apparatus described in Patent Document 1, as shown in FIGS. 1 and 3 of Patent Document 1, when the document is placed on the document placement table, the second document cover is placed on the document placement. It will hinder the visual recognition of the table. For this reason, it is difficult to accurately place the document on the document placing table.

  In addition, after the document is placed on the document placing table, the user needs to manually rotate the second document cover downward in order to hold the document with the second document cover. Further, when the document is placed on the document placement table or after the document is placed on the document placement table, the user places the second document cover manually in order to visually recognize the document placement table and the document. It is necessary to rotate to. That is, in the document reading apparatus described in Patent Document 1, an extra operation is forced on the user.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a document that includes a mechanism for preventing the position of the document placed on the document placement table from shifting when the document cover rotates. It is an object of the present invention to provide an image reading apparatus which is not hindered by the mechanism from accurately placing the image on the document table.

  (1) An image reading apparatus according to the present invention includes an original document placing table provided with a transparent member on which an original document is placed, a reading unit that reads an image of an original document through the transparent member, and the original document placing table. The first posture that exposes the transparent member, the second posture that covers the top surface of the transparent member, the first posture, and the second posture A cover member that is pivotable to a third posture that exposes the transparent member, a fourth posture that is provided on the lower surface side of the cover member and projects from the lower surface of the cover member, and A pressing member that can change its posture to a fifth posture immersed in the cover member, and a posture change of the pressing member in conjunction with the rotation of the cover member, wherein the cover member is in the third posture. Sometimes the holding member is in the fourth position In conjunction with the rotation of the cover member from the third posture to the first posture, the pressing member is in the fifth posture, and the cover member is on the second posture side with respect to the third posture. And an interlocking mechanism that allows the pressing member to change its posture to the fifth posture by contacting the transparent member.

  When the cover member is in the first posture, the pressing member is changed in posture to the fifth posture by the interlocking mechanism. This makes it easy to visually recognize the document placed on the transparent member. When the cover member is rotated from the first posture to the third posture, the pressing member is rotated to the fourth posture by the interlocking mechanism. Further, when the cover member is rotated from the third posture to the second posture side, the pressing member comes into contact with the transparent member. As a result, the document placed on the transparent member is pressed by the pressing member. As a result, it is possible to prevent the position of the document from being shifted when the cover member is rotated. When the cover member is rotated from the third posture to the second posture, the pressing member is rotated to the fifth posture by the interlocking mechanism. Thus, the document placed on the transparent member is covered with the cover member and the pressing member.

  (2) The interlock mechanism is provided in the cover member, and the second posture of the cover member when the cover member is on the first posture side with respect to the third posture and the third posture. A first abutting portion that abuts against the pressing member from the upstream side in the rotation direction to the first posture. The pressing member may be separated from the transparent member by being in contact with the first contact portion.

  According to the above-described configuration, when the pressing member covers the transparent member, the pressing member is separated from the transparent member by the first contact portion pressing the pressing member. That is, the pressing member can be changed in posture by a simple means of abutting and pressing.

  (3) The position of the center of gravity of the pressing member is a position where gravity acts on the fifth posture side when the cover member is on the first posture side with respect to the third posture.

  According to the above-described configuration, the pressing member can be immersed in the cover member by the action of gravity in conjunction with the rotation of the cover member to the first posture side rather than the third posture.

  (4) The interlock mechanism is provided in the cover member, and the second posture of the cover member when the cover member is on the first posture side with respect to the third posture and the third posture. The first contact portion that contacts the pressing member from the upstream side in the rotation direction to the first posture, the second contact portion provided on the document table, and the same as the first shaft When the cover member is rotatable about a second axis that is attached to the cover member and is rotatably attached to the cover member, the cover member is located on the first posture side with respect to the third posture and the third posture. The first time when the cover member is in contact with the second contact portion and is rotated by being pushed by the second contact portion in the process of rotating the cover member between the third posture and the first posture. The movable member extends in the same direction as the second shaft and can rotate on the cover member It is rotatable about the attached third axis, and is connected to the first rotating member so as to be rotated by the rotation of the first rotating member. And a second rotation member connected to the pressing member so as to rotate in the same direction as the rotation direction of the cover member.

  When the cover member is rotated from the second posture to the third posture, the first contact portion provided on the cover member is brought into contact with the pressing member from the upstream side in the rotation direction of the cover member. Further, when the cover member is rotated from the second posture to the third posture, the first rotating member provided on the cover member moved along with the rotation is brought into contact with the second contact portion. .

  When the cover member is rotated from the third posture to the first posture side, the pressing member is rotated in the same direction as the cover member by being pushed by the first contact portion. Further, when the cover member is rotated from the third posture to the first posture side, the first rotating member is rotated by being pushed by the second contact portion. The second rotating member connected to the first rotating member is rotated along with the rotation of the first rotating member. The pressing member connected to the second rotating member is rotated in the same direction as the cover member as the second rotating member rotates. When the cover member is rotated from the first posture to the third posture side, the pressing member is rotated in the same direction as the cover member by the same operation as described above.

  That is, the pressing member is not only rotated by being pressed by the first contact portion, but is also rotated with the rotation of the second rotating member. Therefore, the pressing member can rotate between the fourth position and the fifth position while the cover member is rotated between the third position and the first position. As described above, according to this configuration, the operation of the interlocking mechanism can be suitably realized.

  (5) The interlocking mechanism may further include a biasing member that biases the pressing member toward the fourth posture side.

  According to the above configuration, the pressing member can be pressed against the transparent member and the document placed on the transparent member. Therefore, it is possible to reduce the displacement of the document placed on the document placement table.

  (6) The cover member is engaged with the document table so as to be movable in the vertical direction with respect to the document table.

  According to the above configuration, when the cover member is rotated from the first posture to the second posture in a state where the thick original is placed on the transparent member of the document placement table, the cover member and the cover member are The provided pressing member moves upward with respect to the document table. Therefore, according to the above-described configuration, it is possible to prevent the pressing member from interfering when a thick original is placed on the transparent member.

  (7) The transparent member has, on a part of its upper surface, a minimum size document placement area on which a minimum size document that can be read by the reading unit is placed. The lower surface of the pressing member is provided at a position where the lower surface of the pressing member comes into contact with the transparent member in the minimum-size document placing region.

  According to the above configuration, the boundary portion between the lower surface of the pressing member and the lower surface of the cover member does not protrude outside the document placed on the transparent member. Thereby, when the reading unit reads an image of the original document through the transparent member, the boundary portion can be prevented from being read.

  The image reading apparatus of the present invention includes a pressing member and an interlocking mechanism. Further, it is possible to prevent the position of the document placed on the document placement table when the cover member is rotated by the pressing member and the interlocking mechanism. In the image reading apparatus of the present invention, when the cover member is in the first posture, the pressing member is rotated to the fifth posture by the interlocking mechanism. Therefore, it becomes easy to visually recognize the document placed on the transparent member. Accordingly, it is possible to prevent the pressing member from hindering the document from being accurately placed on the document placing table.

1A and 1B are external perspective views of the multifunction machine 10, in which FIG. 1A shows a state in which the document cover 24 is in a closed position, and FIG. 1B shows a state in which the document cover 24 is in an intermediate position. Yes. 2A and 2B are external perspective views of the multifunction machine 10. FIG. 2A shows a state where the document cover 24 is in an intermediate position and an open position, and FIG. 2B shows a state where the document cover 24 is in an open position. The state is shown. 3A and 3B are a plan view and a cross-sectional view of the scanner unit 12. FIG. 3A is a plan view of the document cover 24, and FIG. 3B is a cross-sectional view taken along line AA in FIG. It is shown. FIG. 4 is an external perspective view of the lower cover 60B. FIG. 5 is an exploded perspective view of each part in FIG. 4 in an exploded state. 6A and 6B are cross-sectional views taken along the line BB of FIG. 3A. FIG. 6A shows the document cover 24 in the closed position, and FIG. 6B shows the document cover 24 in the intermediate position. The state is shown. FIG. 7 is a cross-sectional view taken along the line BB of FIG. 3A. FIG. 7A shows a state in which the document cover 24 is in an intermediate position and an open position, and FIG. Reference numeral 24 denotes an open posture state. 8 is a cross-sectional view taken along the line CC of FIG. 3A. FIG. 8A shows the document cover 24 in the closed position, and FIG. 8B shows the document cover 24 in the intermediate position. The state is shown. 9 is a cross-sectional view taken along the line CC of FIG. 3A. FIG. 9A shows a state where the document cover 24 is in an intermediate position and an open position, and FIG. 9B shows a document cover. Reference numeral 24 denotes an open posture state. FIG. 10 is a diagram schematically showing a cross section taken along the line BB of FIG. 3A in the modified example. FIG. 10A shows the document cover 24 in a closed posture. Shows the state of the document cover 24 in the intermediate position, (C) shows the state of the document cover 24 between the intermediate position and the open position, and (D) shows the state of the document cover 24 opened. The posture status is shown.

  Hereinafter, embodiments of the present invention will be described. The embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention. Further, in the following description, the advance from the start point to the end point in consideration of the arrow in the vector is expressed as the direction, and the traffic on the line connecting the start point and the end point in the vector without considering the arrow is expressed as the direction. In the following description, the vertical direction 7 is defined with reference to the state in which the multifunction machine 10 is installed (the state in FIG. 1A), and the side on which the main body opening 13 is provided is the front side ( A front-rear direction 8 is defined as the front side, and a left-right direction 9 is defined when the multifunction machine 10 is viewed from the front side (front side).

[Multifunction machine 10]
As shown in FIG. 1A, the multifunction machine 10 is formed in a generally thin rectangular parallelepiped. The multifunction device 10 obtains image data by reading an image recorded on a document such as a recording sheet (an example of the document of the present invention) on an upper portion thereof by an image sensor (not illustrated, an example of a reading unit of the present invention). A scanner unit 12 (an example of an image reading apparatus of the present invention) is provided. In addition, the multifunction machine 10 includes a printer unit 11 that records an image on a recording medium such as a recording sheet based on the image data and the like. The multifunction machine 10 has a housing 14 having a main body opening 13 formed in the front. The paper feed tray 20 and the paper discharge tray 21 can be inserted and removed from the main body opening 13 in the front-rear direction 8. A recording medium having a desired size is placed on the paper feed tray 20.

[Printer 11]
The printer unit 11 is provided in a conveyance path (not shown) through which the recording medium passes, at least one roller pair (not shown) that conveys the recording medium, and an image received from an external device. An inkjet recording type recording unit (not shown) that records an image on a recording medium based on data or image data read from a document by the scanner unit 12 is provided. The recording unit is not limited to the ink jet recording method, and may be an electrophotographic method, for example.

[Conveyance path]
The conveyance path is continuous with the curved path curved from the back side (rear side of the multifunction machine 10) of the paper feed tray 20 mounted on the multifunction machine 10 to the front side (front side) of the multifunction machine 10, and the curved path. And is formed of a straight path extending from the back side (rear side) of the multifunction machine 10 to the front side. The straight path extends from the connecting portion with the curved path to the upper side of the paper discharge tray 21 through the lower side of the recording unit. The recording medium fed from the paper feed tray 20 to the curved path by a feed roller (not shown) is conveyed by the roller pair through the curved path and the straight path, and then discharged to the upper side of the paper discharge tray 21. The The conveyance path is formed by being partitioned by two guide members (not shown) that face each other with a predetermined interval therebetween.

[Recording section]
The recording unit is disposed on the upper side of the straight path. The recording unit includes a recording head (not shown) provided at a position that can face the straight path, and a carriage (not shown) on which the recording head is mounted. The recording head is formed with a plurality of nozzles for discharging ink supplied from an ink cartridge (not shown) toward a straight path. The carriage is configured to reciprocate in the left-right direction 9. While the carriage is reciprocated in the left-right direction 9, ink is ejected from the nozzles onto a recording medium that is conveyed along a straight path. Thereby, an image is recorded on the recording medium.

[Scanner unit 12]
As shown in FIGS. 1 and 2, the scanner unit 12 functions as a flat bed scanner (FBS). The scanner unit 12 includes an original platen 22 (an example of the original platen of the present invention) on which an original is placed, an image sensor that reads an image of the original, and an original cover 24 (book) that can cover the original. An example of the cover member of the present invention, a pressing member 80 (an example of the pressing member of the present invention) that can cover the document together with the document cover 24, and a posture change of the pressing member 80 in conjunction with the posture change of the document cover 24. And an interlocking mechanism 85 (see FIGS. 4 and 5, an example of the interlocking mechanism of the present invention).

[Original platen 22 and platen glass 23]
As shown in FIGS. 1B and 2, the document table 22 has a platen glass 23 (an example of the transparent member of the present invention) on which the document is placed on the upper surface thereof. A document read by the image sensor is placed on the platen glass 23. The platen glass 23 is a transmission plate made of a single transparent glass plate or acrylic plate. The image sensor is provided inside the document table 22, that is, below the platen glass 23.

  In the present embodiment, the document is placed on the basis of the left rear end 71 (see FIG. 2) of the platen glass 23. Specifically, the document is aligned with the rear end side of the platen glass 23 with one side extending in the left-right direction 9 with the left rear end 71 as a reference, and the left end of the platen glass 23 with another side extended in the front-rear direction 8. Is placed on the platen glass 23.

  Documents of various sizes can be placed on the platen glass 23 within a range of lengths of sides extending in the left-right direction 9 and the front-rear direction 8 of the platen glass 23. That is, the platen glass 23 has document placement areas corresponding to documents of various sizes on the upper surface thereof. In the document placement area of the platen glass 23, the minimum size document placement when the minimum size document that can be read by the image sensor is placed on the platen glass 23 in the multifunction machine 10 of the present embodiment. A placement area 64 (corresponding to the minimum size document placement area of the present invention) is included. In the present embodiment, the minimum-size document placement area 64 is an area within the range of a frame indicated by a broken line in FIGS. That is, the platen glass 23 has a minimum size document placement area 64 in a part of the upper surface thereof.

[Original cover 24]
As shown in FIGS. 1 and 2, the scanner unit 12 is provided with a document cover 24 that is disposed above the document table 22 and that can be opened and closed with respect to the document table 22 so as to cover the platen glass 23. ing. As shown in FIG. 3B, the document cover 24 includes a cover body 60 and a hinge 61.

  As shown in FIG. 1A, the cover main body 60 is disposed above the platen glass 23. As shown in FIGS. 1 to 3, the cover main body 60 includes an upper cover 60A and a lower cover 60B.

  The upper cover 60A has a thin plate box shape with the lower side opened. However, as shown in FIG. 1A, a convex portion 63 protruding upward is formed on the rear left side portion of the upper surface of the upper cover 60A. A space is formed below the convex portion 63. The space accommodates a pressing member 80 (see FIG. 5) and an interlocking mechanism 85 (see FIG. 5), which will be described later.

  As shown in FIG. 1B and FIG. 2, the lower cover 60B is attached to the upper cover 60A by being fitted into the upper cover 60A from the opened lower side of the upper cover 60A.

  As shown in FIGS. 4 and 5, a mounting portion 65 is formed at a position corresponding to the convex portion 63 of the upper cover 60A in the lower cover 60B. The attachment portion 65 is provided with a front wall 74 and a rear wall 75 that are erected from the upper surface of the lower cover 60B and extend in the left-right direction 9, a plurality of side walls 72 that are erected from the upper surface of the lower cover 60B and extend in the front-rear direction 8. An opening 73 formed on the upper surface of the lower cover 60B is provided.

  The plurality of side walls 72 are provided with two shafts 66 to which a later-described pressing member 80 is attached, two shaft holes 67 to which a later-described first turning member 89 (an example of the first turning member of the present invention) is attached, and later described. Two shaft holes 68 and elongated holes 69 to which the second rotating member 91 (an example of the second rotating member of the present invention) is attached, respectively, and two protrusions 71 and a hooking part to which an urging member described later is attached 101 is formed. In addition, openings 52 (see FIG. 5) are formed in the vicinity of both left and right ends in the vicinity of the rear end of the lower cover 60B. Each opening 52 is formed with a first shaft 62 (corresponding to the first shaft of the present invention) extending in the left-right direction 9.

  As shown in FIG. 5, two hinges 61 are provided. As shown in FIG. 3B, the hinge 61 has a shape that can be inserted into a recess 70 of the document table 22 described later. As shown in FIG. 5, the hinge 61 has a substantially quadrangular prism shape in the present embodiment. In the present embodiment, one end of the hinge 61 is formed in a hook shape. In the present embodiment, the hinge 61 is made of resin. Accordingly, as shown in FIG. 3B, one end of the hinge 61 can be hooked on the first shaft 62 formed in the opening 52. Thereby, the hinge 61 can be rotated about the first shaft 62.

  On the other hand, concave portions 70 are formed at both end portions in the left-right direction 9 at the rear end portion of the document table 22. A hinge 61 is inserted into each of the recesses 70. FIG. 1B and FIG. 2 show a state where the hinge 61 is inserted into the recess 70. The document cover 24 is not fixed to the document table 22 in a state where the hinge 61 is inserted into the recess 70. Therefore, the document cover 24 can slide in the vertical direction 7 in a state where the hinge 61 is inserted into the recess 70. That is, the document cover 24 is engaged with the document table 22 so as to be movable in the vertical direction 7 with respect to the document table 22.

  Further, as described above, the hinge 61 can be rotated about the first shaft 62. That is, the cover main body 60 can rotate around the first shaft 62 in a state where the hinge 61 is stationary. That is, when the hinge 61 is inserted into the recess 70, the document cover 24 rotates about the first shaft 62 with respect to the document table 22 in a state where the document cover 24 is attached to the document table 22. Is possible. Specifically, the document cover 24 is closed in the closed position with respect to the document table 22 by rotating in the direction of the arrow 16 shown in FIG. 7B (see FIG. 1A). (Corresponding to the second posture), an open posture opened with respect to the document table 22 (see FIG. 2, corresponding to the first posture of the present invention), and an intermediate posture (see FIG. 2) between the closed posture and the open posture. 1 (B), which corresponds to the third posture of the present invention).

  As shown in FIG. 1A, when the document cover 24 is in the closed position, the upper surface of the platen glass 23 is covered with the document cover 24. As shown in FIG. 2, when the document cover 24 is in the open position, the upper surface of the platen glass 23 is opened. That is, the platen glass 23 is exposed. As shown in FIG. 1B, when the document cover 24 takes the intermediate posture, the upper surface of the platen 23 is opened, that is, exposed, as in the case of taking the open posture. However, when the document cover 24 takes the intermediate posture, a part of the upper surface of the platen glass 23 is covered with a pressing member 80 described later.

  In the state shown in FIG. 2, and preferably in the state shown in FIG. 2B, the user places the document on the platen glass 23 so that the reading surface of the document faces downward. A first document holder 26 is provided on the lower surface of the document cover 24 so as to cover the platen glass 23. The first document holder 26 is composed of a sponge, a white plate, and the like to hold the document placed on the platen glass 23. When the document cover 24 is closed, the document placed on the platen glass 23 passes through the first document holder 26 of the document cover 24 and the second document holder 27 (see FIG. 2) of a pressing member 80 described later. It is pressed toward the glass 23. In this state, the image sensor is scanned along the platen glass 23 and the image of the original is read.

[Image sensor]
An image sensor is arranged inside the document table 22. The image sensor reads an image of the document through the platen glass 23. The image sensor includes a CIS and a carriage. The CIS includes a light source, a lens, and a light receiving element. CIS irradiates light from a light source to a document in a time-sharing manner and reads reflected light from the document. Specifically, the CIS irradiates a document with light from a light source through the platen glass 23, condenses the reflected light from the document on a light receiving element by a lens, and converts it into an electric signal (image signal). The light receiving elements are arranged, for example, in units of chips in the main scanning direction (front-rear direction 8) of the document. The light source and the lens are arranged in the same direction as the light receiving element. In the present embodiment, the light source includes light emitting elements (light emitting diodes: LEDs) of three colors of red (R), green (G), and blue (B). In the CIS, these three color light emitting elements are sequentially turned on to irradiate light on the original in a time-sharing manner, and reflected light from the original is read as a color image of the original. The CIS configured as described above is mounted on a carriage that reciprocates in the sub-scanning direction (left-right direction 9) of the original along the platen glass 23. The CIS is moved relative to the original on the platen glass 23 by the movement of the carriage.

[Pressing member 80]
As shown in FIGS. 1B and 2, the pressing member 80 is provided on the lower surface side of the document cover 24. As shown in FIG. 5, the pressing member 80 includes a main body portion 81 provided with the second document pressing member 27 and protruding portions 82 protruding from both end portions of the main body portion.

  The lower surface of the main body 81 is configured by the second document presser 27. Similar to the first document holder 26, the second document holder 27 is composed of a sponge and a white plate. The protrusion 82 has a hook shape at the tip. The tip of each protrusion 82 is hooked on each of the shafts 66 provided on the lower cover 60B. Thereby, the pressing member 80 can rotate around the shaft 66. FIG. 4 shows a state in which the protruding portion 82 is attached to the lower cover 60B. As shown in FIGS. 2 and 4, in a state in which the pressing member 80 is attached to the lower cover 60B, the second document pressing member 27 passes through an opening 73 (see FIG. 5) formed on the upper surface of the lower cover 60B. Thus, the document cover 24 is exposed from the lower surface side.

  As shown in FIGS. 5 to 9, a contacted portion 83 is formed in the main body portion 81. The contacted portion 83 is a surface that can contact a first contact portion 86 (see FIGS. 6 to 9) described later.

  As shown in FIG. 5, projections 84 projecting inward are formed on the inner surface of each projecting portion 82 in the left-right direction 9. Each projection 84 is formed with a long hole 75. Each protrusion 84 is inserted through a long hole 69 formed in the lower cover 60B.

  The holding member 80 protrudes from the lower surface of the document cover 24 (see FIG. 1B, corresponding to the fourth position of the present invention), and is immersed in the document cover 24 (see FIGS. 1A and 1B). The posture can be changed as shown in FIG. 2B (corresponding to the fifth posture of the present invention). As shown in FIG. 1B, when the pressing member 80 takes a protruding posture, a part of the upper surface of the platen glass 23 is pressed by the pressing member 80. At this time, the other part of the upper surface of the platen glass 23 is exposed. When the pressing member 80 is in the immersion position as shown in FIG. 1A, the upper surface of the platen glass 23 is pressed by the first document pressing unit 26 and the second document pressing unit 27. When the pressing member 80 is in the immersion position as shown in FIG. 2B, the upper surface of the platen glass 23 is exposed.

  The lower surface of the second document retainer 27 is rectangular. The length of the lower surface of the second document holder 27 in the front-rear direction 8 is shorter than the length of the minimum-size document placement region 64 in the front-rear direction 8. The length of the lower surface of the second document holder 27 in the left-right direction 9 is shorter than the length of the minimum-size document placement area 64 in the left-right direction 9. Further, the end portion of the lower surface of the second document presser 27, that is, the four sides constituting the rectangle are located in the minimum size document placement region 64. As described above, the pressing member 80 has all of the lower surface thereof, that is, all of the second document pressing members 27 exposed from the lower surface side of the document cover 24 through the opening 73 in the minimum size document placing region 64. It is provided in the position which contacts. Therefore, when the minimum-size document placement area 64 is at a position different from the present embodiment, the pressing member 80 is disposed at a position corresponding to the position of the minimum-size document placement area 64.

  The configuration described in the present embodiment is a configuration in which the pressing member 80 is provided at a position where all of the second document pressing members 27 come into contact with the platen glass 23 in the minimum size document placing region 64. However, the pressing member 80 may not be provided at the position as described above. For example, the area of the second document holder 27 may be larger than the area of the minimum size document placement area 64.

[Interlock mechanism 85]
As shown in FIGS. 4 and 5, the interlocking mechanism 85 is provided in the attachment portion 65 of the lower cover 60 </ b> B and in the vicinity thereof. The interlocking mechanism 85 includes a first contact portion 86 (see FIGS. 6 to 9, an example of the first contact portion of the present invention), a second contact portion 87 (see FIGS. 6 to 9, and the second embodiment of the present invention). An example of a contact portion), a first rotating member 89, a second rotating member 91, and a double torsion spring 92 (an example of an urging member of the present invention).

  As shown in FIGS. 6 to 9, the first contact portion 86 is provided on the document cover 24. As shown in FIG. 6B, the first abutting portion 86 rotates the document cover 24 from the closed position to the open position when the document cover 24 is on the open position side of the intermediate position and the intermediate position. From the upstream side of the moving direction (the direction of the arrow 17 in FIG. 6A), it is brought into contact with the contacted portion 83 formed on the pressing member 80.

  As shown in FIGS. 6 to 9, the second contact portion 87 is provided on the document table 22. This will be described in detail below. In the vicinity of the rear end of the document table 22, a convex portion 51 that protrudes upward from the upper surface of the document table 22 is formed. The position of the convex portion 51 in the left-right direction 9 is between two shaft holes 67 (see FIG. 5) formed in the attachment portion 65. An opening 53 other than the opening 73 is formed between the two shaft holes 67 of the attachment portion 65. And the convex part 51 protrudes through the opening 53 to the space in which the attaching part 65 is provided. The outer peripheral surface of the convex portion 51 is a curved surface. And the said curved surface is the 2nd contact part 87 of this invention.

  As shown in FIG. 4, the first rotation member 89 and the second rotation member 91 are rotatably attached to the lower cover 60 </ b> B of the document cover 24. In the following description of the first rotation member 89 and the second rotation member 91, the first rotation member 89 and the second rotation member 91 are attached to the document cover 24, and the vertical direction 7 and the front-rear direction 8. , And the left-right direction 9 are defined.

  As shown in FIG. 5, the first rotating member 89 is a substantially flat plate-like member that extends in the left-right direction 9. Moreover, the 1st rotation member 89 is a member of the shape bent at an obtuse angle in the middle position when visually recognized from the right side or the left side. Protrusions 93 (corresponding to the second axis of the present invention) protruding outward in the left-right direction 9 are formed at the bent positions of the right and left surfaces of the first rotating member 89. In addition, protrusions 94 that protrude outward in the left-right direction 9 are formed at the upper end portions of the right and left surfaces of the first rotating member in the up-down direction 7. That is, the protrusions 93 and 94 extend in the same direction as the first shaft 62. The protrusion 93 is inserted through the shaft hole 67 formed in the lower cover 60B. That is, the protrusion 93 is rotatably attached to the shaft hole 67. Thereby, the first rotation member 89 can rotate around the protrusion 93. Further, the protrusion 94 is inserted through a long hole 97 formed in a second rotating member 91 described later.

  As shown in FIG. 6A, the lower end of the first rotating member 89 is in contact with any member including the second contact portion 87 when the document cover 24 is in the closed posture side with respect to the intermediate posture. Not touched. On the other hand, as shown in FIGS. 6B and 7, the lower end of the first rotating member 89 is the second contact portion 87 when the document cover 24 is in the intermediate posture and the open posture side of the intermediate posture. Abut. As a result, as will be described later, the first rotation member 89 is rotated by being pushed by the second contact portion 87 in the process in which the document cover 24 is rotated between the intermediate posture and the open posture.

  As shown in FIG. 5, the second rotating member 91 is a substantially flat plate-like member that extends in the left-right direction 9. Protrusions 95 (corresponding to the third axis of the present invention) protruding outward in the left-right direction 9 are formed at the upper end positions of the right and left surfaces of the second rotating member 91. The second rotating member 91 has protrusions extending downward and obliquely downward at the left and right ends. A protrusion 96 protruding outward in the left-right direction 9 is formed at the tip of the protrusion extending downward. That is, the protrusions 95 and 96 extend in the same direction as the protrusion 93. A long hole 97 is formed on the inner surface in the left-right direction 9 at each of the tips of the two protrusions extending obliquely downward in the forward direction.

  The protrusion 95 is inserted into a shaft hole 68 formed in the lower cover 60B. That is, the protrusion 95 is rotatably attached to the shaft hole 68 formed in the document cover 24. As a result, the second rotation member 91 can rotate around the protrusion 95.

  A protrusion 94 of the first rotating member 89 is inserted into the long hole 97. Thus, as will be described later, when the first rotation member 89 rotates in conjunction with the rotation of the document cover 24, the second rotation member interlocks with the rotation of the first rotation member 89. 91 rotates. That is, the second rotation member 91 is connected to the first rotation member 89 with play so as to be rotated by the rotation of the first rotation member 89.

  The protrusion 96 is inserted into a long hole 75 formed in the protrusion 84 of the pressing member 80. Accordingly, as will be described later, the first rotation member 89 rotates in conjunction with the rotation of the document cover 24, and the second rotation member 91 rotates in conjunction with the rotation of the first rotation member 89. When moved, the pressing member 80 rotates in conjunction with the rotation of the second rotating member 91. At this time, the rotation direction of the pressing member 80 is the same as the rotation direction of the first rotation member 89. That is, the second rotating member 91 is connected with the pressing member 80 with play so as to rotate the pressing member 80 in the same direction as the rotation direction of the document cover 24 by rotating.

  Note that the above play is not necessarily required. For example, a biasing member such as a spring is attached to at least one of the second rotation member 91 or the first rotation member 89, and the positions of the rotation members 91 and 89 can be changed by the biasing force of the biasing member. In this case, no play is required to connect the second rotating member 91 and the first rotating member 89. Further, a biasing member such as a spring is attached to at least one of the second rotating member 91 or the pressing member 80, and the position of the second rotating member 91 or the pressing member 80 is changed by the biasing force of the biasing member. If possible, no play is required to connect the second rotating member 91 and the pressing member 80.

  As shown in FIG. 5, the double torsion spring 92 includes a coil portion 98 provided at both ends, a first arm portion 99 extending from each coil portion 98, and a second arm connecting both the coil portions 98. Part 100. When the double torsion spring 92 is not attached anywhere, the first arm portion 99 and the second arm portion 100 are extended from the coil portion 98 at a predetermined angle.

  As shown in FIG. 4, the coil portion 98 is attached to the protrusion 71. The first arm portion 99 is hooked on a hook portion 101 provided outside the left and right ends of the attachment portion 65. The second arm portion 100 is disposed so as to press the pressing member 80 attached to the lower cover 60B from above. The double torsion spring 92 is attached in a state where the angle formed by the first arm portion 99 and the second arm portion 100 is larger than the predetermined angle. As a result, a force is exerted on the first arm portion 99 and the second arm portion 100 to return to the predetermined angle. As a result, the second arm portion 100 biases the pressing member 80 downward, that is, in the protruding posture side.

[Change in posture of document cover 24 and pressing member 80]
Hereinafter, the posture changes of the document cover 24 and the pressing member 80 will be described. As shown in FIGS. 6A and 8A, when the document cover 24 is in the closed posture, the pressing member 80 is accommodated in the space below the convex portion 63. That is, the pressing member 80 is in an immersive posture. Here, the pressing member 80 is in a state of resisting the downward biasing force by the double torsion spring 92. This is because the pressing member 80 is in contact with the platen glass 23 and cannot be rotated downward by the urging force. Further, the downward force due to the weight of the document cover 24 is larger than the urging force of the double torsion spring 92, that is, the force to rotate the document cover 24 relatively upward with respect to the pressing member 80. . For this reason, the document cover 24 maintains the closed posture against the urging force of the double torsion spring 92.

  When the document cover 24 is in the closed posture, the first contact portion 86 is separated from the contacted portion 83. Further, the first rotating member 89 is separated from the second contact portion 87.

  When the document cover 24 is rotated in the direction of the arrow 17 from the state shown in FIGS. 6A and 8A, the first rotation member 89 attached to the document cover 24 and the second rotation. The position of the moving member 91 changes. On the other hand, even if the document cover 24 is rotated, the pressing member 80 is not rotated. This is because the pressing member 80 is biased downward by the double torsion spring 92.

  As shown in FIGS. 6B and 8B, when the document cover 24 is rotated to take an intermediate position, the pressing member 80 is not accommodated in the convex portion 63. That is, the pressing member 80 is protruded from the lower surface side of the document cover 24. That is, the pressing member 80 is changed in posture from the immersive posture to the protruding posture in conjunction with the posture change of the document cover 24 from the closed posture to the intermediate posture.

  When the document cover 24 is in the intermediate posture, the first contact portion 86 is in contact with the contacted portion 83 from the lower side, that is, from the upstream side in the rotation direction of the document cover 24. Further, the first rotating member 89 is in contact with the second contact portion 87.

  When the document cover 24 rotates in the direction of the arrow 17 from the state shown in FIGS. 6B and 8B, the first contact portion 86 pushes the contacted portion 83. Thereby, the pressing member 80 is rotated in the direction of the arrow 17. As a result, the pressing member 80 is separated from the platen glass 23. When the pressing member 80 is rotated, the first rotating member 89 attempts to change its position. However, the movement of the first rotation member 89 is blocked by the second contact portion 87. As a result, the first rotation member 89 is rotated in the direction of the arrow 18 (see FIG. 6B) by being pushed by the second contact portion 87. Then, the second rotating member 91 connected to the first rotating member 89 rotates in the direction of the arrow 19 (see FIGS. 6B and 8B). In addition, although the 1st rotation member 89 and the 2nd rotation member 91 are rotated so that it may mutually approach, the 1st rotation member 89 and the 2nd rotation member 91 are connected with play. Therefore, such rotation is possible.

  As shown in FIG. 8B, when the second rotating member 91 rotates in the direction of the arrow 19, the connecting portion of the second rotating member 91 and the pressing member 80 is rotated generally rearward. That is, the pressing member 80 is pulled in the direction of the arrow 19 by the second rotating member 91. Thereby, the pressing member 80 rotates in the direction of the arrow 40. As a result, the document cover 24 and the pressing member 80 are in the state shown in FIGS. 7A and 9A.

  When the document cover 24 is further rotated in the direction of the arrow 17 from the state shown in FIGS. 7A and 9A, the above-described operation, that is, the direction of the arrow 18 of the first rotation member 89 is performed. , Rotation of the second rotation member 91 in the direction of the arrow 19, and rotation of the pressing member 80 in the direction of the arrow 40 are continued. As a result, as shown in FIGS. 7B and 9B, the document cover 24 is changed to the open posture.

  In the state of FIG. 7B and FIG. 9B, the pressing member 80 is accommodated in the convex portion 63. That is, the pressing member 80 is changed in posture from the protruding posture to the immersive posture in conjunction with the posture change of the document cover 24 from the intermediate posture to the open posture.

  When the document cover 24 is rotated from the open position (the state shown in FIGS. 7B and 9B) to the closed position (the state shown in FIGS. 6A and 8A), The interlocking mechanism 85 operates in reverse to the above. That is, the first rotation member 89 rotates in the direction opposite to the arrow 18, the second rotation member 91 rotates in the direction opposite to the arrow 19, and the pressing member 80 rotates in the direction opposite to the arrow 40. .

  As described above, the interlocking mechanism 85 changes the posture of the pressing member 80 in conjunction with the rotation of the document cover 24. Further, the interlocking mechanism 85 sets the pressing member 80 in the protruding posture when the document cover 24 is in the intermediate posture (see FIGS. 6B and 8B). Further, the interlocking mechanism 85 causes the pressing member 80 to be immersed in the posture in conjunction with the rotation of the document cover 24 from the intermediate posture to the open posture (see FIGS. 7B and 9B). Further, the interlocking mechanism 85 enables the holding member 80 to change its posture to the immersive posture by contact with the platen glass 23 when the document cover 24 is closer to the closing posture than the intermediate posture (FIG. 6A and FIG. 6). (See FIG. 8A).

[Effect of the embodiment]
According to the present embodiment, as shown in FIG. 2B, when the document cover 24 is in the open posture, the pressing member 80 is changed into the immersive posture by the interlocking mechanism 85. Thereby, it becomes easy to visually recognize the document placed on the platen glass 23. When the document cover 24 is rotated from the open position to the intermediate position, the pressing member 80 is rotated to the protruding position by the interlocking mechanism 85. Further, when the document cover 24 is rotated from the intermediate position to the closed position, the pressing member 80 comes into contact with the platen glass 23 as shown in FIG. As a result, the document placed on the platen glass 23 is pressed by the pressing member 80. As a result, it is possible to prevent the position of the document from being shifted when the document cover 24 is rotated. When the document cover 24 is rotated from the intermediate position to the closed position, the pressing member 80 is rotated to the immersive position by the interlocking mechanism 85. As a result, as shown in FIG. 1A, the document placed on the platen glass 23 is covered with the document cover 24 and the pressing member 80. Accordingly, it is possible to prevent the pressing member 80 from hindering the accurate placement of the document on the document table 22.

  Further, according to the present embodiment, when the document cover 24 is rotated from the closed position to the intermediate position, the first contact portion 86 provided on the document cover 24 is located upstream of the rotation direction of the document cover 24. To the pressing member 80 (see FIG. 6B). Further, when the document cover 24 is rotated from the closed position to the intermediate position, the first rotation member 89 provided on the document cover 24 moved along with the rotation is in contact with the second contact portion 87. (See FIG. 6B).

  When the document cover 24 is rotated from the intermediate posture to the open posture side, the pressing member 80 is pushed by the first contact portion 86, so that the same direction as the document cover 24 (the direction of the arrow 40, FIG. 8B). ))). Further, when the document cover 24 is rotated from the intermediate posture to the open posture side, the first rotation member 89 is rotated by being pushed by the second contact portion 87. The second rotation member 91 connected to the first rotation member 89 is rotated as the first rotation member 89 rotates. The pressing member 80 connected to the second rotating member 91 rotates in the same direction as the document cover 24 (the direction of the arrow 40, see FIG. 8B) as the second rotating member 91 rotates. Is done. When the document cover 24 is rotated from the open position to the intermediate position, the pressing member 80 is rotated in the same direction as the document cover 24 by the same operation as described above.

  That is, the pressing member 80 is not only rotated by being pressed by the first contact portion 86, but is also rotated as the second rotating member 91 is rotated. Therefore, the pressing member 80 can rotate between the protruding posture and the immersion posture while the document cover 24 is rotated between the intermediate posture and the open posture. As described above, according to the present embodiment, the operation of the interlocking mechanism 85 can be suitably realized.

  Further, according to the above-described embodiment, the document cover 24 can slide in the vertical direction 7 with respect to the document table 22. Therefore, when the document cover 24 is rotated from the open position to the closed position with the thick document placed on the platen glass 23 of the document table 22, the document cover 24 and the document cover 24 are provided. The holding member 80 is moved upward with respect to the document table 22. Therefore, according to the above-described embodiment, it is possible to prevent the pressing member 80 from becoming an obstacle when a thick original is placed on the platen glass 23.

  Further, according to the above-described embodiment, the boundary portion between the second document pressing member 27 of the pressing member 80 and the first document pressing member 26 of the document cover 24 does not protrude outside the document placed on the platen glass 23. . Thereby, when the image sensor reads the image of the document through the platen glass 23, the boundary portion can be prevented from being read.

[Modification of Embodiment]
In the above-described embodiment, the configuration in which the interlocking mechanism 85 includes the first contact portion 86, the second contact portion 87, the first rotation member 89, and the second rotation member 91 has been described. In such a configuration, the first rotating member 98 is rotated in conjunction with the rotation of the document cover 24, and the second rotating member 91 is interlocked with the rotation of the first rotating member 89. The holding member 80 is rotated in conjunction with the rotation of the second rotating member 91. However, the interlocking mechanism 85 is not limited to the configuration as in the above-described embodiment.

  For example, the interlocking mechanism 85 is replaced with the first contact portion 86 and the weight 28 as shown in FIG. 10 instead of the second contact portion 87, the first rotation member 89, and the second rotation member 91. It may be configured. The weight 28 is attached to the pressing member 80. In the present modification, the position where the weight 28 is attached is slightly ahead of the position just above the rotation shaft (shaft 66) of the pressing member 80. Thereby, the position of the center of gravity of the pressing member 80 becomes the position where the weight 28 is attached.

  As shown in FIG. 10A, when the document cover 24 is in the closed posture, the weight 28 applies a downward force to the pressing member 80 by gravity. As a result, the second document presser 27 of the presser member 80 presses the platen glass 23. At this time, the pressing member 80 takes an immersion posture in which it is immersed in the document cover 24.

  Even if the document cover 24 rotates in the direction of the arrow 17 from the state shown in FIG. 10A, the document cover 24 is in the intermediate position as shown in FIG. Until the first contact portion 86 comes into contact with the contacted portion 83, the pressing member 80 is not rotated until the state is reached. That is, the pressing member 80 is projected from the document cover 24 as the document cover 24 rotates (see FIG. 10B). In other words, the holding member 80 is changed in posture from the immersive posture to the protruding posture in conjunction with the posture change of the document cover 24 from the closed posture to the intermediate posture.

  When the document cover 24 rotates from the state shown in FIG. 10B in the direction of the arrow 17, the pressed portion 80 is moved in the direction of the arrow 18 by the pressed portion 83 being pressed by the first contact portion 86. Rotate. Then, as shown in FIG. 10C, the weight 28 is positioned on the rear side of the shaft 66. At this time, the gravity G due to the weight 28 is composed of a force component G1 for rotating the pressing member 80 backward and a force component G2 for rotating the pressing member 80 forward. The force component G1 is larger than the force component G2. Therefore, the pressing member 80 rotates in the direction of the arrow 40. Then, as shown in FIG. 10D, the pressing member 80 is immersed in the document cover 24 in a state where the document cover 24 is in the open position by being rotated in the direction of the arrow 17. It becomes a state, that is, an immersion posture. As described above, the position of the center of gravity of the pressing member 80 is a position where gravity acts on the immersion posture side when the document cover 24 is on the open posture side with respect to the intermediate posture.

12 ... Scanner unit 22 ... Document table 23 ... Platen glass (transparent member)
24 ... Document cover 62 ... First axis 64 ... Minimum size document placement area 80 ... Presser member 85 ... Interlock mechanism 86 ... First contact portion 87 ... Second Abutting portion 89 ... first rotating member 91 ... second rotating member 93 ... projection 95 ... projection

Claims (7)

A document placement table provided with a transparent member on which a document is placed;
A reading unit that reads an image of a document through the transparent member;
Above the document table, is provided so as to be rotatable about a first axis, a first posture exposing the transparent member, a second posture covering the top surface of the transparent member, and the first posture; A cover member rotatable between a second posture and a third posture exposing the transparent member;
A pressing member that is provided on the lower surface side of the cover member and is capable of changing its posture to a fourth posture protruding from the lower surface of the cover member and a fifth posture immersed in the cover member;
The posture of the pressing member is changed in conjunction with the rotation of the cover member, and when the cover member is in the third posture, the pressing member is in the fourth posture, and the cover member is in the first posture. The pressing member is moved to the first posture from the three postures to the fifth posture, and when the cover member is closer to the second posture than the third posture, the pressing member An interlocking mechanism that enables the posture to be changed to the fifth posture by contact with the transparent member. The above interlocking mechanism is
The cover member is provided on the cover member, and when the cover member is closer to the first posture side than the third posture and the third posture, the cover member is rotated from the second posture to the first posture. A first abutting portion that abuts against the pressing member from the upstream side in the moving direction;
The holding member is
The image reading apparatus according to claim 1, wherein the image reading apparatus is separated from the transparent member by being in contact with the first contact portion. The position of the center of gravity of the holding member is
3. The image reading apparatus according to claim 2, wherein gravity is applied to the fifth posture side when the cover member is closer to the first posture side than the third posture. The above interlocking mechanism is
The cover member is provided on the cover member, and when the cover member is closer to the first posture side than the third posture and the third posture, the cover member is rotated from the second posture to the first posture. A first abutting portion that abuts against the pressing member from the upstream side in the moving direction;
A second contact portion provided on the document table;
The cover member is rotatable about a second shaft that extends in the same direction as the first shaft and is rotatably attached to the cover member, and the cover member has the first posture more than the third posture and the third posture. By being in contact with the second contact portion when in the posture side and being pushed by the second contact portion in the process of rotating the cover member between the third posture and the first posture. A first rotating member that rotates;
The first shaft is rotatable about a third shaft that extends in the same direction as the second shaft and is rotatably attached to the cover member, and is rotated by the rotation of the first rotating member. A second rotating member that is connected to the rotating member and connected to the pressing member so as to rotate the pressing member in the same direction as the rotating direction of the cover member by rotating. The image reading apparatus according to claim 1, further comprising: The above interlocking mechanism is
The image reading apparatus according to claim 4, further comprising an urging member that urges the pressing member toward the fourth posture side.   6. The image reading apparatus according to claim 1, wherein the cover member is engaged with the document placing table so as to be movable in a vertical direction with respect to the document placing table. The transparent member has, on a part of the upper surface, a minimum size document placement area where a minimum size document that can be read by the reading unit is placed,
7. The image reading apparatus according to claim 1, wherein all of the lower surface of the pressing member is provided at a position in contact with the transparent member in the minimum-size document placing region.

Images