JP2018157511A - Image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device capable of accurately reading an image of a copy placed on a placement part.SOLUTION: The image reading device has a copy holder table 12 and an open/close member. The copy holder table 12 includes: a frame having a copy abutting part 28; a placement part for placing a copy; and a copy holding member configured to rotate in conjunction with an open/close movement of the open/close member to press the copy to the placement part. The copy holding member is configured so as, when the thickness of a copy is larger than a predetermined thickness, to function as a copy abutting part to prevent the copy from moving on the placement part when the open/close member is closed. With this, even when the thickness of the copy is larger than a predetermined thickness, an image of the copy also can be accurately read.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image reading apparatus.

  2. Description of the Related Art Conventionally, an image reading apparatus includes a document placing table which is a main body of the image reading device, and a document pressing cover disposed so as to be openable and closable with respect to the document placing table. When the document is placed on the document holding cover and the document holding cover is closed, the image reading module disposed inside the document placing table is moved by the drive unit to read the image of the document on the transmission plate. (For example, refer to Patent Document 1).

JP 2010-283801 A

  However, in the conventional image reading apparatus, when a document is placed on the transmission plate and the document pressing cover is closed, the document may move on the transmission plate. Cannot read well.

  An object of the present invention is to solve the problems of the conventional image reading apparatus and to provide an image reading apparatus that can accurately read an image of a document placed on a placing portion.

  For this purpose, the image reading apparatus according to the present invention includes a document placing table and an opening / closing member disposed to be openable and closable with respect to the document placing table.

  The document placing table includes a frame provided with a document abutting portion for abutting and positioning the document, a placement portion for placing the document and being surrounded by the frame, and a swing relative to the frame. A document pressing member is provided that is movably disposed and is rotated in conjunction with opening / closing of the opening / closing member to press the document against the placing portion.

  Further, the document pressing member functions as a document butting portion when the document is thicker than a predetermined thickness.

  According to the present invention, the image reading apparatus includes a document placing table and an opening / closing member disposed to be openable and closable with respect to the document placing table.

  The document placing table includes a frame provided with a document abutting portion for abutting and positioning the document, a placement portion for placing the document and being surrounded by the frame, and a swing relative to the frame. A document pressing member is provided that is movably disposed and is rotated in conjunction with opening / closing of the opening / closing member to press the document against the placing portion.

  Further, the document pressing member functions as a document butting portion when the document is thicker than a predetermined thickness.

  In this case, the document pressing member is disposed so as to be swingable with respect to the frame, and is rotated in conjunction with opening / closing of the opening / closing member so as to press the document against the mounting portion, so that the document is placed on the mounting portion. After placing, the document does not move on the placement portion when the opening / closing member is closed. Therefore, it is possible to read the image of the document with high accuracy.

  When the document is thicker than the predetermined thickness, the document pressing member functions as the document abutting portion, so that an image of the document thicker than the predetermined thickness can be read with high accuracy.

FIG. 3 is a first cross-sectional view of the main part of the image reading apparatus when the document presser cover is opened according to the first embodiment of the present invention. FIG. 3 is a perspective view of the image reading apparatus when the document pressing cover is opened according to the first embodiment of the present invention. 1 is a perspective view of a main part of an image reading apparatus according to a first embodiment of the present invention. It is a perspective view of the interlocking mechanism in the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of the main part of the image reading apparatus when the document presser cover is closed by a predetermined angle in the first embodiment of the present invention. FIG. 3 is a cross-sectional view of a main part of the image reading apparatus when the document presser cover is completely closed according to the first embodiment of the present invention. FIG. 5 is a second cross-sectional view of the main part of the image reading apparatus when the document pressing cover is opened according to the first embodiment of the present invention. FIG. 6 is a perspective view of an image reading apparatus when a document pressing cover is opened according to a second embodiment of the present invention. It is a control block diagram of the image reading apparatus in the 2nd Embodiment of this invention. FIG. 9 is a cross-sectional view of a main part of an image reading apparatus when a document presser cover is opened according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view of a main part of an image reading apparatus when a document presser cover is completely closed according to a third embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an image reading apparatus for reading an image of a thin original such as a single sheet and an original thicker than a predetermined thickness such as a book original will be described.

  FIG. 1 is a cross-sectional view of a first main part of an image reading apparatus when the document presser cover according to the first embodiment of the present invention is opened, and FIG. 2 shows the document presser cover according to the first embodiment of the present invention. FIG. 3 is a perspective view of an essential part of the image reading apparatus according to the first embodiment of the present invention, and FIG. 4 is a perspective view of the interlocking mechanism according to the first embodiment of the present invention. 5 is a cross-sectional view of the main part of the image reading apparatus when the original cover is closed by a predetermined angle according to the first embodiment of the present invention. FIG. 6 is an original document according to the first embodiment of the present invention. 7 is a cross-sectional view of the main part of the image reading apparatus when the presser cover is completely closed, and FIG. 7 is a second cross-sectional view of the main part of the image reading apparatus when the document presser cover is opened according to the first embodiment of the present invention. It is. 1 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 7 is a cross-sectional view taken along the line BB in FIG.

  In the figure, 11 is an image reading device, 12 is a document placing table which is the main body of the image reading device 11, 14 is swingable with respect to the document placing table 12 via hinges hg1 and hg2, and A document pressing cover 16 as an opening / closing member disposed to be freely opened and closed is a white document pressing sheet attached to the surface of the document pressing cover 14 facing the document placing table 12. The document pressing sheet 16 presses the document when the document is placed on the document placing table 12 and the document pressing cover 14 is closed. An elastic member 18 such as a sponge is disposed between the document pressing cover 14 and the document pressing sheet 16.

  The document placement table 12 is formed on the periphery of the upper surface of the document placement table 12 and is composed of a document placement frame 21 as a frame made of a frame having a rectangular shape, a transparent material such as glass, and the document placement frame 21. Is provided with a transmission plate 23 or the like as a placement portion for placing a document. The document placement frame 21 includes a front frame Ff, left and right horizontal frames Fs1, Fs2, and a rear frame Fr.

  The hinges hg1 and hg2 are made movable in the vertical direction by being fitted to the recesses k1 and k2 formed in the rear frame Fr. Therefore, when reading an image of a document thicker than a predetermined thickness, such as a book document, the hinges hg1 and hg2 are moved upward when the document pressing cover 14 is closed, so that the book document is stabilized and pressed from above. be able to.

  An operation / display unit 24 projects from the document table 12 in front of it. The operation / display unit 24 includes an operation unit 26 including various buttons as operation elements, and a display unit 27 such as an LED screen. Further, an image reading module 30 is disposed below the transmission plate 23 in the document table 12, and the image reading module 30 is mounted on the document table 12, that is, on the transmission plate 23. A document image is read and read image data is generated.

  Then, on the transmission plate 23, a predetermined portion of the document placement frame 21, in the present embodiment, on the front edge of the rear frame Fr and the right edge of the horizontal frame Fs1 (on the side of the horizontal frame Fs2). When placing a document on the document, document abutting portions 28 and 29 for abutting and positioning the document are formed.

  Above the document abutting portion 28, the document is rotated in conjunction with the opening and closing of the document pressing cover 14, and the document for pressing the document positioned against the document abutting portion 28 against the transmission plate 23 from above. A document pressing auxiliary plate 31 as a pressing member is extended along the document butting portion 28 so as to cover the document butting portion 28.

  The document pressing auxiliary plate 31 is disposed at the left and right ends so as to be swingable and movable in the front-rear direction with respect to a support member 33 formed by being raised from the rear frame Fr. The document pressing auxiliary plate 31 has a predetermined width, a main body 31a extending between the support members 33, and a standing part as a supported part formed by being raised at both ends of the main body 31a. The upper part 31b, a hanging part 31c formed by hanging from the front edge of the main body part 31a, and a predetermined amount projecting forward from the lower edge of the hanging part 31c, and placed on the transmission plate 23 A presser 31d for selectively pressing the document is provided.

  A pin 35 as a locking portion having a cylindrical shape is formed on each of the support members 33 so as to protrude toward the document pressing auxiliary plate 31, and is locked to the upright portion 31b extending in the front-rear direction. A long groove 36 as a portion is formed, and the pin 35 is locked to the long groove 36 so as to be rotatable and movable. The long groove 36 is formed to be inclined with respect to the main body 31a with the front end 36f being close to the main body 31a and the rear end 36r being separated from the main body 31a.

  Further, a torsion coil spring 38 as a first urging member is disposed between the document pressing auxiliary plate 31 and the document placing frame 21, and in the present embodiment, between the upright portion 31 b and the support member 33. Established. The torsion coil spring 38 is provided with a pin 35 fitted into the coil portion 38a, with one end 38b engaged with the support member 33, and the other end 38c engaged with the upright portion 31b, with a predetermined biasing force. Thus, the rear edge egr of the main body 31a of the document pressing auxiliary plate 31 is biased downward (the document pressing auxiliary plate 31 is turned clockwise in the drawing with the pin 35 as the center of rotation).

  In FIG. 3, reference numeral 32 denotes a reading unit that reads an image of a document when the document is automatically fed by an automatic document feeder (not shown) in the image reading device 11, and 34 denotes an image that is read by the reading unit 32. This is a guide for sending a document to a stacker of an automatic document feeder.

  By the way, the document presser cover 14 and the document presser auxiliary plate 31 are swung together by the interlocking mechanism 43, and the presser part 31d is separated from the transmission plate 23 in a state where the document presser cover 14 is opened. With the presser cover 14 closed, the presser portion 31 d is pressed against the transmission plate 23.

  For this purpose, the interlocking mechanism 43 is disposed so as to be movable up and down with respect to the document table 12 and is moved up and down as the document pressing cover 14 is opened and closed. An elevating member 45 as a second lever that is moved in the vertical direction according to the elevating of the member 44, and an interlocking member 46 that moves the elevating members 44, 45 in conjunction with each other.

  Each of the elevating members 44 and 45 includes racks 44g and 45g made of teeth formed on surfaces facing each other.

  In addition, the interlocking member 46 includes a shaft sh1, a pinion gear g1 disposed on the shaft sh1 so as to be rotatable relative to the shaft sh1, and an end of the shaft sh1 on the lifting member 45 side. At the end, the pinion gear g2 connected to the shaft sh1 through the D-cut portion, the pinion gears g1 and g2 are connected radially outward of the shaft sh1, and torque transmitted between the pinion gears g1 and g2 is transmitted. A torque limiter tq and the like for limiting are provided, and the pinion gears g1 and g2 and the racks 44g and 45g are engaged with each other to form a rack and pinion structure.

  The elevating member 44 has an upper end 44t protruding from a hole h1 formed in the rear frame Fr and is brought into contact with a contact surface S1 formed at a corresponding portion of the document pressing cover 14, and the elevating member 45 is The upper end 45t protrudes from the hole h2 formed in the rear frame Fr and is brought into contact with the rear edge egr of the main body 31a of the document pressing auxiliary plate 31.

  The elevating member 44 is urged upward by a coil spring 48 as a second urging member so that the upper end 44t of the elevating member 44 is always in contact with the contact surface S1. An upper end 48 u of the coil spring 48 is fixed at a predetermined position in the document placing frame 21, and a lower end 48 d of the coil spring 48 is fixed to a locking piece 44 d formed at the lower end of the elevating member 44.

  A limiter unit 51 is disposed at a predetermined position in the document placement frame 21. When the lower end of the elevating member 45 is brought into contact with the limiter unit 51, the downward movement of the elevating member 45 is stopped. Then, the operation of the interlocking mechanism 43 is stopped. At this time, the elevating member 45 is not projected from the hole h2, and the rear edge egr of the main body 31a is brought into contact with the rear frame Fr.

  Therefore, when the document pressing cover 14 is opened, the elevating member 44 is moved upward by the biasing force of the coil spring 48, the interlocking member 46 is rotated, and the elevating member 45 is moved downward. As a result, the document pressing auxiliary plate 31 is rotated in the clockwise direction by the urging force of the torsion coil spring 38, and the pressing portion 31 d is separated from the transmission plate 23.

  When the document pressing cover 14 is closed, the elevating member 44 is moved downward against the urging force of the coil spring 48, the interlocking member 46 is rotated, and the elevating member 45 is moved upward. As a result, the document pressing auxiliary plate 31 is rotated counterclockwise against the biasing force of the torsion coil spring 38, and the pressing portion 31 d is pressed against the transmission plate 23.

  In order to prevent the document presser cover 14 and the document presser assisting plate 31 from interfering with each other when the document presser cover 14 is closed, a recess Sp is formed at a position corresponding to each raised portion 31b of the document presser cover 14. Is formed.

  Next, the operation of the image reading apparatus 11 when an original is placed on the original placement table 12, that is, on the transmission plate 23, and an image of the original is read will be described. When reading an image of a thin document such as a single sheet, as shown in FIG. 1, the document pressing auxiliary plate 31 is placed at the front position, and the pin 35 is placed on the rear end 36r side of the long groove 36. When reading an image of a document thicker than a predetermined thickness, such as a book document, the document pressing auxiliary plate 31 is placed at the rear position and the pin 35 is placed on the front end 36f side of the long groove 36, as shown in FIG. .

  When the operator opens the document pressing cover 14, as shown in FIG. 1, the elevating member 44 is moved upward by the urging force of the coil spring 48, the interlocking member 46 is rotated, and the elevating member 45 is moved downward. Moved. Then, by the biasing force of the torsion coil spring 38, the document pressing auxiliary plate 31 is rotated clockwise around the pin 35, and the pressing portion 31d of the document pressing auxiliary plate 31 is separated from the transmission plate 23. The rotation of the document pressing auxiliary plate 31 in the clockwise direction is stopped when the rear edge egr of the main body 31a contacts the rear frame Fr.

  When the lower end of the elevating member 45 is brought into contact with the limiter 51 and stopped, the interlocking member 46 is stopped. Since the torque limiter tq is disposed between the pinion gear g2 and the pinion gear g1, the lifting member 44 is moved upward by the urging force of the coil spring 48 when the document pressing cover 14 is not sufficiently opened. . Therefore, the difference between the movable amount of the elevating member 44 and the movable amount of the elevating member 45 can be absorbed.

  Further, while the elevating member 45 is moving downward, the torsion coil spring 38 urges the document pressing auxiliary plate 31 in the clockwise direction, and the urging force by the torsion coil spring 38 and the document pressing auxiliary plate 31. In this embodiment, the rotation holding force P2 by the torque limiter tq is set larger than the resultant force P1, and the biasing force of the coil spring 48 is the rotation force. Since it is set larger than the holding force P2, even if the resultant force P1 is applied to the elevating member 45, the elevating member 45 does not move downward by receiving the resultant force P1.

  Next, the operator places a document on the transmission plate 23. Since the reference position when placing the document is the left back on the transmission plate 23, the operator abuts the document against the document abutting portions 28 and 29 and positions the document. At this time, the space between the pressing portion 31d of the document pressing auxiliary plate 31 and the transmission plate 23 is wider toward the front and narrower toward the rear.

  Therefore, even if the document is curled or folded, the document can be easily abutted against the document abutting portion 28.

  Further, since the pressing portion 31d of the document pressing auxiliary plate 31 is not formed in the vicinity of both ends of the main body portion 31a, the operator visually confirms whether the document is reliably hit against the document abutting portions 28 and 29. can do.

  With the document placed on the transmission plate 23 at an accurate position, the operator holds the document presser cover 14 at a predetermined angle, as shown in FIG. ], The elevating member 44 is pushed downward by the document presser cover 14 against the urging force of the coil spring 48, moved downward, the interlocking member 46 is rotated, and the elevating member 45 is moved upward. . As a result, the document pressing auxiliary plate 31 is rotated counterclockwise around the pin 35 against the urging force of the torsion coil spring 38, and the pressing portion 31 d presses the document against the transmission plate 23. That is, the pressing portion 31d presses the document against the transmission plate 23 before the document pressing cover 14 is completely closed. As a result, the document does not move even if it receives an external force on the transmission plate 23.

  Then, the rotation of the document pressing auxiliary plate 31 in the counterclockwise direction is stopped, and the upward movement of the elevating member 45 is stopped.

  Subsequently, when the operator further closes the document pressing cover 14, the elevating member 44 is pushed by the document pressing cover 14 against the urging force of the coil spring 48 and moved further downward. Since the movement of the elevating member 45 and the rotation of the interlocking member 46 are stopped when the document pressing cover 14 is closed by 14 [°], the torque limiter tq is idled and the pinion gear g1 is rotated. The elevating member 44 is moved downward.

  As shown in FIG. 6, when the document pressing cover 14 is completely closed, the elevating member 44 is stopped at the lowest position, and the elevating member 45 is stopped at the uppermost position.

  When the document is placed on the transmission plate 23 in this way, the image reading module 30 is moved in the left-right direction (horizontal frame Fs1, Fs2 direction) by a drive unit (not shown) and placed on the transmission plate 23. Scan the original image.

  By the way, a document pressing sheet 16 is attached to the surface of the document pressing cover 14 facing the document placing table 12 via an elastic member 18. When the document pressing cover 14 is closed, the document pressing sheet 16 uniformly applies the document. , The pressure for pressing the document varies between the portion where the document is directly pressed by the document pressing sheet 16 and the portion where the document is pressed via the document pressing auxiliary plate 31.

  Therefore, in the present embodiment, the document pressing sheet 16 is divided into a region Ar1 for directly pressing the document and a region Ar2 for pressing the document via the document pressing auxiliary plate 31, that is, the pressing portion 31d, and the elastic member 18 is respectively provided. The region Ar2 is separated from the surface of the transmission plate 23 by the thickness of the pressing portion 31d. Thereby, the document can be pressed with a uniform pressure.

  Further, in the present embodiment, in order to prevent the area Ar1 from climbing onto the presser portion 31d when the document presser cover 14 is closed, a predetermined interval between the area Ar1 and the front edge egf of the presser portion 31d is used. A clearance CL of 1 [mm] is formed.

  When a clearance CL is formed between the area Ar1 and the front edge egf of the pressing portion 31d, but no clearance is formed between the areas Ar1 and Ar2, and thus a thin original is placed on the transmission plate 23 However, it is possible to read the image with high accuracy without causing show-through.

  When the operator opens the document pressing cover 14 after the document image is read, the elevating member 44 is moved upward, the interlocking member 46 is rotated, and the elevating member 45 is moved downward. Then, the document pressing auxiliary plate 31 is rotated in the clockwise direction, and the pressing portion 31 d is separated from the transmission plate 23. Therefore, the original can be removed from the transmission plate 23.

  As described above, when the document pressing cover 14 is opened, the document pressing auxiliary plate 31 is rotated in the clockwise direction, and the pressing portion 31d is separated from the transmission plate 23. However, the pressing portion 31d and the transmission plate 23 are separated. A thick original, for example, a book original cannot be inserted between the two.

  Therefore, in the present embodiment, when a book document is inserted between the pressing portion 31d and the transmission plate 23, the document pressing cover 14 is opened, and the rear edge egr of the main body portion 31a of the document pressing auxiliary plate 31 is set to the rear frame. The document pressing auxiliary plate 31 can be moved backward while being in contact with Fr, and can be retracted from above the document abutting portion 28.

  Therefore, as shown in FIGS. 2 and 7, a concave portion 41 having a rectangular shape is formed at a predetermined portion of the rear frame Fr, in the present embodiment, at the center in the width direction of the rear frame Fr. . In addition, a hook hk is formed by hanging from the rear edge egr at the center portion of the rear edge egr of the main body 31a, that is, at a position corresponding to the recess 41. In the recess 41, a coil spring 39 as a third urging member is disposed between the hook hk and the rear wall 41r of the recess 41, and the coil spring 39 moves the document pressing auxiliary plate 31. Energize forward.

  Further, a protrusion ex for locking the hook hk is formed at a predetermined position of the bottom wall 41b of the concave portion 41, in the present embodiment, substantially at the center in the front-rear direction of the bottom wall 41b.

  Therefore, the document presser cover 14 is opened, and the document presser auxiliary plate 31 is placed at a position in front of the document abutting portion 28 by the biasing force of the coil spring 39 as shown in FIG. When the pin 35 is pushed toward the rear frame Fr against the urging force, the document pressing auxiliary plate 31 can be moved backward until the pin 35 reaches the front end 36f of the long groove 36. Then, as shown in FIG. 7, when the hook hk is locked to the protrusion ex, the document pressing auxiliary plate 31 is placed at a rear position that does not cover the document abutting portion 28 and is locked.

  At this time, since the front edge egf of the pressing portion 31d is located behind the document abutting portion 28, the book document can be abutted against the document abutting portions 28 and 29 for positioning.

  Therefore, the image can be read while holding the book document by hand.

  The long groove 36 is formed with the front end 36f close to the main body 31a and the rear end 36r separated from the main body 31a and inclined with respect to the main body 31a. The long groove 36 is placed horizontally with the egr in contact with the rear frame Fr. Therefore, the document pressing auxiliary plate 31 can be easily moved backward.

  Further, it is possible to read the image while closing the document pressing cover 14 and pressing the book document with the document pressing cover 14, but when the document pressing cover 14 is closed, the elevating member 45 is moved upward and the document pressing auxiliary plate 31. Is rotated counterclockwise, the hook hk and the protrusion ex are unlocked, and the coil spring 39 biases the document pressing auxiliary plate 31 forward. Therefore, the book document placed on the transmission plate 23 does not move.

  As described above, in the present embodiment, the document pressing auxiliary plate 31 is disposed so as to be swingable with respect to the document placing frame 21, and the document is placed on the transmission plate 23 when the document pressing cover 14 is closed. Therefore, the original placed on the transmission plate 23 does not move when the original cover 14 is closed, and the original image can be read with high accuracy.

  By the way, in the present embodiment, when reading an image of a book document, it is necessary to retract the document pressing auxiliary plate 31 from the document abutting portion 28. If it is placed against the front edge egf of the presser 31d and placed on the transmission plate 23, a part of the image, that is, the part on the front frame Ff side may not be read.

  Therefore, even if the book document is accidentally abutted against the document pressing auxiliary plate 31 and placed on the transmission plate 23, the document pressing auxiliary plate 31 functions as the document pressing portion so that the image can be read properly. A second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 8 is a perspective view of the image reading apparatus when the document pressing cover according to the second embodiment of the present invention is opened, and FIG. 9 is a control block diagram of the image reading apparatus according to the second embodiment of the present invention. .

  In the figure, 11 is an image reading device, 12 is a document placing table, 14 is a document pressing cover as an opening / closing member, 30 is an image reading module, 31 is a document pressing auxiliary plate as a document pressing member, and 61 and 62 are document loading. A document for detecting the size of a book document, which is disposed in a predetermined position below the transmission plate 23 serving as a placement unit in the placement table 12, in the present embodiment, substantially at the center of the document placement table 12. The detection sensor 63 is disposed in the vicinity of the hinge hg2 in the rear frame Fr, and opens and closes the document pressing cover 14, in the present embodiment, a cover opening / closing sensor for detecting that the document pressing cover 14 is closed. It is.

  Reference numeral 71 denotes a control unit that controls the entire image reading apparatus 11. The control unit 71 includes a document detection processing unit Pr1 and an image reading processing unit Pr2.

  When the document detection processing unit Pr1 reads the sensor output of the cover opening / closing sensor 63 and detects that the document pressing cover 14 is closed, the read image data generated by the image reading module 30 and the document detection sensors 61 and 62 are detected. , The position of the edge of the book document on the side of the horizontal frame Fs1 and the position of the edge of the back frame Fr are calculated, and the position and size of the book document are detected based on the position of each edge.

  The image reading processing unit Pr2 determines the intersection of the extension line of the document abutting portion 29 and the extension line of the front edge egf of the pressing portion 31d based on the detected position and size of the book document. And the image of the book original is read.

  Accordingly, in the present embodiment, the document pressing auxiliary plate 31 functions as a document butting portion, so that the operator accidentally hits the book document against the front edge egf of the pressing portion 31d and places it on the transmission plate 23. Even so, the image of the book document can be read properly.

  As described above, in this embodiment, the document pressing auxiliary plate 31 functions as a document butting portion for pressing a single sheet document against the transmission plate 23 and butting a book document. Therefore, the image of the book document can be read with high accuracy.

  By the way, in the first embodiment, when reading the image of the book document, it is necessary to retract the document pressing auxiliary plate 31 from the document abutting portion 28. Operation is troublesome. Therefore, a third embodiment of the present invention in which it is not necessary to retract the original pressing auxiliary plate 31 from the original abutting portion 28 when reading an image of a book original will be described. In addition, about the thing which has the same structure as 1st, 2nd embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 10 is a cross-sectional view of the main part of the image reading apparatus when the document presser cover according to the third embodiment of the present invention is opened, and FIG. FIG.

  In this case, document abutting portions 28 and 29 are formed at the edges of the rear frame Fr and the horizontal frame Fs1 (FIG. 2), and a document pressing assisting plate 31 as a document pressing member is disposed above the document abutting portion 28. The support member 33 is disposed so as to be swingable and immovable in the front-rear direction.

  Similarly to the second embodiment, document detection sensors 61 and 62 (FIG. 8) are provided below the transmission plate 23 as a placement portion in the document placement table 12, and a cover opening / closing sensor 63 is provided on the rear frame Fr. The document detection processing unit Pr1 and the image reading processing unit Pr2 are provided in the control unit 71 (FIG. 9).

  In the present embodiment, when the operator opens the document presser cover 14 as the opening / closing member, as shown in FIG. 10, the elevating member 44 as the first lever is moved upward, and the interlocking member 46 is moved. It is rotated and the raising / lowering member 45 as a 2nd lever is moved below. As a result, the document pressing auxiliary plate 31 is rotated clockwise around the pin 35 as a locking portion, and the pressing portion 31 d of the document pressing auxiliary plate 31 is separated from the transmission plate 23. In the present embodiment, the document pressing auxiliary plate 31 is disposed so as to be immovable in the front-rear direction with respect to the support member 33, so that the pin 35 is not a long groove but rotates in a circular hole 76. Arranged freely.

  Next, when the operator presses and positions the single-sheet document against the document abutting portions 28 and 29 and closes the document pressing cover 14 by 14 [°], the elevating member 44 is moved downward and interlocked. The member 46 is rotated and the elevating member 45 is moved upward. As a result, the document pressing auxiliary plate 31 is rotated counterclockwise about the pin 35, and the pressing unit 31 d presses the single sheet document against the transmission plate 23. As a result, the document does not move even if it receives an external force on the transmission plate 23.

  When the operator completely closes the document presser cover 14, as shown in FIG. 11, the elevating member 44 is stopped at the lowest position, and the elevating member 45 is stopped at the uppermost position.

  In this way, the image reading device 11 reads an image of a single paper document placed on the transmission plate 23.

  When reading an image of a book document, the operator opens the document pressing cover 14 and holds the book document at the front edge of the pressing portion 31d with the pressing portion 31d of the auxiliary pressing plate 31 separated from the transmission plate 23. When positioned against the egf and the document abutting unit 29, the document detection processing unit Pr1 of the control unit 71 reads the read image data generated by the image reading module 30 and the sensor outputs of the document detection sensors 61 and 62, and The position of the edge on the horizontal frame Fs1 side and the position of the edge on the rear frame Fr side of the book document are calculated, and the position and size of the book document are detected based on the position of each edge.

  Then, the image reading processing unit Pr2 of the control unit 71 calculates a reading reference position based on the position and size of the book document, and reads the image of the book document.

  In each of the above embodiments, the image reading apparatus 11 has been described. However, the present invention can be applied to an image forming apparatus such as a scanner, a copying machine, or a multifunction peripheral.

  The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention, and they are not excluded from the scope of the present invention.

DESCRIPTION OF SYMBOLS 11 Image reading apparatus 12 Document mounting base 14 Document pressing cover 21 Document mounting frame 23 Transmission plate 28, 29 Document butting part 31 Document pressing auxiliary plate

Claims (7)

(A) a document table;
(B) having an opening / closing member disposed to be openable / closable with respect to the document table;
(C) The document placing table includes a frame provided with a document abutting portion for abutting and positioning the document, a placing portion surrounded by the frame for placing the document, and the frame. A document pressing member that is disposed so as to be swingable and is rotated in conjunction with opening and closing of the opening and closing member to press the document against the placing portion.
(D) The image reading device, wherein the document pressing member functions as a document butting portion when the document is thicker than a predetermined thickness.   The image reading apparatus according to claim 1, wherein the document pressing member includes a pressing unit that presses the document against the placement unit.   The image reading apparatus according to claim 2, wherein the pressing portion presses the document against the placement portion before the opening / closing member is completely closed.   The image reading apparatus according to claim 1, wherein the document pressing member is disposed so as to surround the document butting portion above the document butting portion.   The image reading apparatus according to claim 4, wherein the document pressing member is movably disposed with respect to the frame and is retracted from above the document abutting portion when the document is thicker than a predetermined thickness.   The image reading apparatus according to claim 2, wherein the document pressing member is disposed movably with respect to the frame, and causes the front edge of the pressing portion to function as a document abutting portion when the document is thicker than a predetermined thickness. .   The image reading apparatus according to claim 2, wherein the document pressing member is disposed so as not to move with respect to the frame, and causes the front edge of the pressing portion to function as a document abutting portion when the document is thicker than a predetermined thickness. .

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