JP6514627B2 - Reader and combined device - Google Patents

Description

  The present invention relates to an image reading apparatus, and more particularly to a structure for increasing the accuracy of a reading start position.

  Conventionally, in this type of image reading apparatus, when reading an image of a document conveyed by the ADF, the reading position by the reading sensor is determined based on the reference position indicated by the reference position member disposed on the flat bed (for example, , Patent Document 1). On the other hand, in order to generate a reading timing by the reading sensor, a document detector that detects a document conveyed by the ADF is generally provided on a conveyance path of the ADF.

JP, 2011-66707, A (page 7, FIG. 7)

  However, in the conventional image reading apparatus, the distance between the document detector and the reading position of the reading sensor in the document conveyance direction may vary, which may affect the reading accuracy. In the future, it is required to reduce the above-mentioned variation.

The reader according to the invention
A flat transparent member that transmits light, a feeding unit that can be opened and closed with respect to the transparent member, and a document fed by the feeding unit via the transparent member at a reading position, the reading position And an image reading unit including the transparent member and the reading unit, and a drive control unit configured to control driving of the reading unit.
The feeding unit includes a loading unit for loading the document, a transport unit for transporting the document from the loading unit toward a position read by the reading unit, and a document for detecting the transported document. 1 document detector, and a first reference member for setting the reading position,
The transparent member includes a document placement surface on which a reading document is placed;
The image reading unit movably holds the reading unit in a predetermined movement area in the sub scanning direction to read the document placed on the document placement surface, and includes a second reference member.
The drive control unit
Moving the reading unit to the reading position based on the reading result of the first reference member by the reading unit ;
When the reading unit is moved in the predetermined movement area, reading of the document placed on the document placement surface is started based on the movement distance from the second reference member. .

  According to the present invention, the first reference member is disposed in the feeding unit, and the document reading position is positioned based on the first reference member, so the document reading position relative to the feeding unit at the closed position is This can be kept constant, and can suppress variations in the document reading start position.

FIG. 1 is an external perspective view of a multifunction peripheral of a first embodiment employing an image reading device according to the present invention. FIG. 7 is a schematic configuration diagram for describing a main part configuration of the image reading device 30 in a state in which the ADF unit is closed in the first embodiment. It is the elements on larger scale which expanded the periphery of the reading glass for ADF shown in FIG. FIG. 6 is a perspective view of the conveyance guide unit provided in the ADF unit as viewed from below in a state in which the ADF unit is closed. FIG. 10 is a perspective view of the conveyance guide unit as seen from below with the ADF frame held. FIG. 10 is a cross-sectional view of the front positioning boss and the vicinity thereof in a state in which the ADF unit is closed. It is the elements on larger scale of the reading sensor vicinity in FIG. FIG. 6 is a view showing an example of a transmission mechanism for transmitting a rotational force to the registration rollers disposed in the transport guide unit held so as to be able to swing. FIG. 2 is a block diagram mainly illustrating a configuration of a drive control system of the image reading apparatus according to the present invention. FIG. 6 is a diagram for explaining the operation of the image reading apparatus. FIG. 13 is a schematic configuration diagram for describing a main part configuration of the image reading device in a state in which the ADF unit is closed in the image reading device of Embodiment 2 according to the present invention.

Embodiment 1
FIG. 1 is an external perspective view of the multifunction device 1 according to the first embodiment in which the image reading device according to the present invention is employed. FIG. 2 is a view of the image reading device 30 of the multifunction device 1 with the ADF unit 41 closed. It is a schematic block diagram for demonstrating the principal part structure. In addition, there are cases where upper, lower, left, right, front, and rear directions with respect to the multifunction device 1 are specified by viewing the multifunction device 1 shown in FIG. 1 from the front (the direction of arrow A).

  As shown in FIG. 1, the multifunction peripheral 1 includes an image printing unit 10 disposed in the lower part and an image reading device 30 disposed above the image printing unit 10 via a pair of left stay 21 and right stay 22. The image reading apparatus 30 includes an image reading unit 31 and an automatic document feeder (hereinafter referred to as an ADF unit) 41 disposed above the image reading unit 31. The ADF unit 41 includes an ADF rotating shaft 44 by the image reading unit 31. It is rotatably held around. That is, the ADF unit 41 has a closed position in which the open angle shown in FIG. 1 is closed at 0 degrees and an open position opened at, for example, an open angle of about 60 degrees with the ADF pivot shaft 44 extending in the left and right direction It is rotatably configured between.

  As shown in FIG. 2, in the ADF unit 41 as a feeding unit, a document tray 106 as a loading unit, a pickup roller 108, a separation roller 109, a separation pad 110, a registration roller 127 as a registration roller pair, and a pressure roller 128, discharge roller 118, pressure roller 119 paired with this, registration sensor 132, scan sensor 134 as a document detector, coil spring 117, conveyance path 112, document pressing member 116, first as a first reference member The reference member 135 and the stacker 122 are disposed, and the image reading unit 31 as an image reading unit includes an ADF reading glass 115 and an FB (flat bed) reading glass 123 as a transparent member, and a reading sensor as a reading unit 120 And a document pick-up member 121 is disposed.

  The pickup roller 108, the separation roller 109, the registration roller 127, the discharge roller 118, and the sheet conveyance path 112 correspond to a conveyance unit.

  The original document 106 is set on the document tray 106, and the set original document 107 is detected by the document sensor 113 provided on the document tray 106, and the detected information is transmitted to the control unit 201 (FIG. 9) described later. Be done. The pickup roller 108 feeds out the topmost original of the read original 107 placed on the original tray 106 toward the sheet conveyance path 112 in the ADF unit 41. On the downstream side of the pickup roller 108 in the sheet conveyance direction, a separation roller 109 and a separation pad 110 for separating and conveying the read originals 107 fed out by the pickup roller 108 one by one are provided. Therefore, the separation pad 110 is disposed opposite to the position where the separation roller 109 can abut.

  The ADF unit 41 includes an exterior member 111. A registration roller 127 is disposed on the downstream side of the separation roller 109 in the sheet conveyance direction in the conveyance path 112 of the reading document 107 formed inside, and the registration position is opposite to that A pressure roller 128 is provided which presses against the roller 127 and is driven to apply a conveying force to the read document 107.

  In the upper portion of the image reading unit 31, the ADF reading glass 115 formed of a plate-like transparent member having a first main surface (for example, front surface) 115a and a second main surface (for example, back surface) 115b in the horizontal direction. It is arranged. The document pressing member 116 is urged against the ADF reading glass 115 by a spring 117 provided at the upper side, and presses the reading document 107 conveyed along the conveyance path 112 against the ADF reading glass 115. Further, in order to provide a gap between the document pressing member 116 and the ADF reading glass 115 to make the movement of the read document 107 passing smoothly, a film of a predetermined thickness is provided outside the document passing area on the lower surface of the document pressing member 116. You may paste it.

  The document scooping member 121 has a function of scooping the read document 107 in order to guide the read document 107 having passed through the ADF reading glass 115 to the discharge roller 118. The discharge roller 118 and the pressure roller 119 provided at the opposite position complete the reading and discharge the read original 107 picked up by the original scooping member 121 to the outside of the ADF unit 41. The stacker 122 is for stacking the discharged originals 107, and there is an FB reading glass 123 disposed on the top of the image reading unit 31 flush with the ADF reading glass 115 under the stacker 122. Are facing each other.

  The reading sensor 120 is disposed in the image reading unit 31 so as to be covered by the reading glass 115 for ADF and the reading glass 123 for FB which are located on the top of the image reading unit 31 and arranged on the same plane. A guide member 155 (FIG. 3) extending in parallel (horizontal direction) with the first main surface 115a of the glass 115 allows movement in the sub scanning direction (arrows B and C) in which the guide member 155 extends. It is held.

  The X, Y, and Z axes in FIG. 2 have an X axis in the direction in which the guide member 155 extends, and are parallel to the first major surface 115 a of the ADF reading glass 115 and orthogonal to the X axis. The Y axis is taken in the rotational axis direction of the pickup roller 108, and the Z axis is taken in the direction orthogonal to these two axes. Moreover, when each axis | shaft of X, Y, Z is shown in another figure, these axial directions shall show a common direction. That is, the X, Y, and Z axes in each of the drawings indicate the arrangement directions when the depiction portion in each of the drawings constitutes the composite apparatus 1 shown in FIG. Here, it is assumed that the Z reading axis 115 is substantially vertical, that is, the reading glass 115 for ADF and the reading glass 123 for FB are horizontal.

  The reading sensor 120 is an optical reflection type image sensor, for example, a light emitting diode for irradiating light to the reading original document 107 on the reading glass 115 for ADF, and a light receiving for detecting reflected light from the reading original document 107 and converting it into an electric signal. The reading data received by the light receiving diode is transmitted to the control unit 201 (FIG. 9) and driven by a third drive motor 206 (FIG. 9) described later, and the sub scanning direction (arrow C direction) It moves in parallel in the opposite direction (arrow B direction).

  In the ADF reading mode for reading the read original 107 conveyed by the ADF unit 41, the reading sensor 120, as shown in FIG. 2, a predetermined original reading position facing the original pressing member 116 with the ADF reading glass 115 interposed therebetween. The process is stopped at P1, and while being pressed by the document pressing member 116, the image of the read document 107 moving in the transport direction on the first main surface 115a of the ADF reading glass 115 is read.

  FIG. 3 is a partially enlarged view of the periphery of the ADF reading glass 115 shown in FIG. 2. FIG. 4 is a conveyance guide as a conveyance unit provided in the ADF unit 41 when the ADF unit 41 is closed. FIG. 5 is a perspective view of the unit 124 as viewed from below, FIG. 5 is a perspective view of the transport guide unit 124 as it is held by the ADF frame 125 as a frame, and FIG. FIG. 6 is a cross-sectional view of the front positioning boss 136 and the vicinity of the transport guide frame 126 in a closed state. FIGS. 3 and 6 show a state in which the reading sensor 120 stands by at a standby position described later.

  The ADF unit 41 includes an ADF frame 125 that constitutes a framework, and the ADF frame 125 is provided with a transport guide unit 124 (FIG. 4). The conveyance guide unit 124 includes the conveyance guide frame 126, the registration roller 127, the pressure roller 128, the registration spring 129, the bearings 130 a and 130 b (FIG. 5), the registration sensor 132, the scan sensor 134, and the sheet conveyance path 112 near the registration roller 127. The lower guide 114 and the first reference member 135 are provided as a transport guide that constitutes the

  In the ADF unit 41, the front and rear side chassis 126a and 126b of the conveyance guide frame 126 pivotally support both ends of each shaft of the registration roller 127 and the pressure roller 128, and the front and rear side chassis 125a of the ADF frame 125 , 125b (not shown) hold the both ends of the conveyance guide unit 124 with respect to a virtual center plane (perpendicular to the rotation axis of the registration roller 127) between the front and rear side chassis 126a, 126b. In this case, only the components on the front side are illustrated because they are substantially plane-symmetrical, and will be described with reference to FIGS. 2 to 5.

  The front end of the rotation shaft of the registration roller 127 is held by the front side chassis 126a via a bearing 130a, and the front end of the rotation shaft of the pressure roller 128 is held by the front side chassis 126a via a bearing 130b. Here, while the bearing 130a is fixed to the front side chassis 126a, the bearing 130b is held slidably in a direction away or approaching the bearing 130a, and further, it is attached in the direction approaching by the resist spring 129. It is powered. Accordingly, the pressure roller 128 is urged by the resist spring 129 into pressure contact with the resist roller 127.

  The registration sensor lever 131 constituting the registration sensor 132 is disposed on the conveyance path on the upstream side of the registration roller 127, and is axially supported by the conveyance guide frame 126. When the registration sensor lever 131 is pivoted by the reading original 107 passing through and the light shielding at the main body of the registration sensor 132 is released by the light shielding plate 150 integrally formed, the registration sensor 132 is turned from on to off, Passage information notifying passage of the read original 107 passing here is transmitted to a control unit 201 (FIG. 9) described later.

  Similarly, a scan sensor lever 133 constituting the scan sensor 134 is disposed on the downstream conveyance path of the registration roller 127 and is axially supported by the conveyance guide frame 126. When the scan sensor lever 133 is pivoted by the read original 107 passing through and the light shielding of the scan sensor 134 main body due to the light shielding plate 151 integrally formed is released, the scan sensor 134 turns from the off state to the on state. Passage information notifying passage of the read original 107 passing here is transmitted to a control unit 201 (FIG. 9) described later.

  The conveyance guide frame 126 is provided with a first reference member 135 serving as a reference of a reading position when the reading sensor 120 disposed in the image reading unit 31 reads the reading original 107 conveyed by the ADF unit 41. There is. The first reference member 135 is disposed at the front end of the lower surface of the conveyance guide frame 126 and extends in the longitudinal direction (Y-axis direction), as shown in FIG. Paste the color-coded sheet in white and black, and use the color boundary line 149 (Fig. 4) as the reference position, but if the transport guide frame 126 is white, paste a black sheet, or transport guide frame 126 May be painted black, or a black mold member may be attached.

  The lower guide 114 of the conveyance guide unit 124 guides the read original 107 discharged from the registration roller 127 to the first main surface 115 a of the ADF reading glass 115, but the arrangement position of the first reference member 135 This also corresponds to the end position of the lower guide 114 opposite to the ADF reading glass 115.

  A pair of left and right bosses 141 and 142 are provided in the vicinity of both end portions in the left and right direction (X-axis direction) of the upper portion in the front side chassis 126a of the conveyance guide frame 126. The convex portion 145 is formed. On the other hand, on the front side chassis 125a of the ADF frame 125 holding the conveyance guide unit 124, a pair of left and right boss holes 143 and 144 in which the pair of left and right bosses 141 and 142 and the plate-like convex portion 145 are loosely fitted A hole 161 is formed, and a notch hole 160 is formed to avoid contact of the bearings 130a, 130b and so on. Note that these bosses, boss holes and the like are similarly configured on the rear side of the ADF unit 41.

  Therefore, when the corresponding members are loosely fitted in these holes and the transport guide unit 124 is attached to the ADF frame 125, the transport guide unit 124 is, for example, the boss 141 loosely fitted in the boss holes 143 and 144. , 142 are held by the ADF frame 125 so as to be able to move. In addition, when the conveyance guide unit 124 is attached, these holes are, as shown in FIG. 5, the lower surface of the conveyance guide frame 126 as described later when the ADF unit 41 is closed. It is formed to be able to face the upper surface of the frame 138 (FIG. 3) of FIG.

  As described above, the conveyance guide unit 124 held in the state of being able to float in the ADF frame 125 has the plate-like convex portion 145 protruding outward from the long hole 161 and the ADF frame facing the plate-like convex portion 145. A spring 147 (FIG. 5) stretched in a compressed state between the spring receiving member 146 formed at 125 is biased in the direction of arrow D (vertically downward in the state where the ADF unit 41 is closed).

  FIG. 8 is a view showing an example of a transmission mechanism for transmitting a rotational force to the registration roller 127 disposed in the transport guide unit 124 held so as to be swingable.

  As shown in the figure, the registration roller 127 includes, for example, a passive gear 127a coaxially fixed to the rear end. On the other hand, as for the motor support lever 181 which fixes and holds the second drive motor 205 (see FIG. 9) described later on the tip end side, the drive gear 205a fixed to the rotation shaft of the second drive motor 205 It is pivotally supported (181a) by the ADF frame 125 (FIG. 6) so as to mesh with the passive gear 127a. Further, the motor support lever 181 is biased in the arrow E direction in which the drive gear 205a is in pressure contact with the passive gear 127a by a biasing member 182 which is extended between the motor support lever 181 and the ADF frame 125.

  Therefore, even when the registration roller 127 swings along with the transport guide unit 124 held so as to be swingable, the rotational force of the second drive motor 205 can be stably transmitted to the registration roller 127. .

  In the vicinity of both end portions in the front-rear direction (Y-axis direction) of the lower surface of the conveyance guide frame 126, a pair of front and rear positioning bosses 136 and 137 as engaging portions are provided. On the other hand, in the upper surface portion of the frame 138 of the image reading unit 31, a front positioning hole 139 (FIG. 6) corresponding to the front positioning boss 136 and a rear positioning long hole 140 (not shown) corresponding to the rear positioning boss 137. ) Are formed, and as shown in FIG. 6, when the ADF unit 41 is closed, they are fitted together.

  By this fitting, in the conveyance guide unit 124, on the image reading unit 31, the rotation axis of the registration roller 127 and the extending direction of the guide member 155 (FIG. 3) of the image reading unit 31 are exactly orthogonal to each other. Is positioned at The front positioning hole 139 and the rear positioning elongated hole 140 correspond to the engaged portion.

  At this time, as shown in FIG. 6, the pair of front and rear positioning bosses 136 and 137 abut on the first main surface 115 a of the ADF reading glass 115, and the conveyance guide unit 124 floats with respect to the ADF frame 125. It is configured to be

  Accordingly, the transport guide unit 124 is positioned by the image reading unit 31 in the vertical and horizontal directions with the ADF unit 41 closed, and is biased by the spring 147 against the ADF reading glass 115.

  FIG. 7 is a partially enlarged view of the vicinity of the reading sensor 120 in FIG. As shown in the figure, on the upper surface of the frame 138 of the image reading unit 31, the reading original 107 placed on the original placing surface 123a (FIG. 2) which is the upper surface of the reading glass 123 for FB is read. A second reference member 148 serving as a reference of the reading start position P2 (FIG. 3) when reading is attached. The second reference member 148 also affixes a sheet colored in white and black adjacent to each other in the transport direction, and uses the color boundary line 171 (FIG. 7) as a reference position.

  FIG. 9 is a block diagram mainly showing the configuration of the drive control system of the image reading apparatus 30 according to the present invention.

  In the figure, a reading instruction button 210 is disposed on the operation panel 25 (FIG. 1) of the image reading device 30, and transmits a reading instruction to the control unit 201 in response to a pressing operation by the operator. The control unit 201 includes a microprocessor, a ROM, a RAM, an input / output port, a timer, and the like, a reading instruction from the instruction button 210, document placement information from the document sensor 113 (see FIG. 2), the registration sensor 132, Information on passage of the document from the scan sensor 134 and reading data from the reading sensor 120 are received, sequence control of the entire image reading apparatus 30 is performed, and a document reading operation is performed.

  The conveyance drive unit 202 drives the first drive motor 204 according to an instruction from the control unit 201, and the medium conveyance rollers such as the pickup roller 108, the separation roller 109, and the discharge roller 118 via the transmission mechanism such as a gear train. Is rotationally driven to convey the document downstream along the paper conveyance path 112. Further, the conveyance drive unit 202 drives the second drive motor 205 in accordance with an instruction from the control unit 201, and the registration sensor 132 detects the passage of the read original document 107 being conveyed, and then the registration roller at a predetermined timing described later. 127 is driven to rotate.

  The reading sensor driving unit 203 drives the third driving motor 206 according to an instruction from the control unit 201, and causes the reading sensor 120 to move along the guide member 155 (FIG. 3) via a transmission mechanism such as a gear train. Move in the B and C directions. At this time, as described later, the control unit 201 reads the reading sensor 120 based on the boundary line 149 of the first reference member 135 detected from the read data received from the reading sensor 120 or the boundary line 171 of the second reference member 148. Control the movement of

  The control unit 201, the conveyance drive unit 202, the reading sensor drive unit 203, the first drive motor 204, the second drive motor 205, and the third drive motor 206 correspond to a drive control unit. Here, although the resist roller 127 is driven by a dedicated motor, it is driven by the same motor as the pickup roller 108 and the like, and a clutch mechanism is used to transmit the rotational force as needed to transmit the resist roller 127. It may be configured to control the rotation of

  In the above configuration, the operation of the image reading device 30 will be described with reference to FIGS. FIG. 10 is a diagram for explaining the operation of the image reading apparatus 30.

  The transport guide unit 124 (FIG. 4) biased in the direction of arrow D by the spring 147 (FIG. 5) with the ADF unit 41 opened has left and right bosses on which the left and right bosses 141 and 142 are loosely fitted. The pressure in the direction of the arrow D of the holes 143 and 144 is in pressure contact, and movement in the same direction is restricted.

  When the ADF unit 41 is closed in this state, the front positioning holes 139 (FIG. 6) formed on the frame 138 of the image reading unit 31 are disposed on the front and rear positioning bosses 136 and 137 disposed on the conveyance guide frame 126. Each is inserted into the positioning long hole 140 (not shown), and eventually comes into contact with the first main surface (upper surface) 115 a of the ADF reading glass 115, and the conveyance guide unit 124 with respect to the image reading unit 31 in the vertical and horizontal directions It is positioned.

  Furthermore, while the ADF unit 41 is pivoted to the closed position where the ADF unit 41 is in the closed state, the transport guide unit 124 remains stationary, and accordingly, the left and right bosses 141 and 142 have the boss holes 143 and 144 respectively on the left and right. The spring 147 is further compressed away from the edge. As a result, the transport guide unit 124 is in a floating state with respect to the ADF frame 125, and at the same time, is urged against the ADF reading glass 115 by the spring 147 and firmly fixed. The series of movements are similarly performed on the rear side of the ADF unit 41.

  The control unit 201 (FIG. 9) moves the reading sensor 120 to a waiting position in the vicinity of the left end in the image reading unit 31 and causes the reading sensor 120 to stand by as shown in FIG. In this initial state, when the reading instruction by pressing the reading instruction button 210 by the operator is received, the control unit 201 places the read original 107 on the original tray 106 based on the original placement information received from the original sensor 113. If it is determined that the original document 107 is placed, the ADF reading mode is started.

  In the ADF reading mode, the control unit 201 first instructs the reading sensor driving unit 203 to move the reading sensor 120 in the arrow C direction at a predetermined speed from the standby position. The control unit 201 monitors the read data received from the read sensor 120 while moving in the direction of the arrow C, and detects the passage of the boundary line 149 of the first reference member 135. When the passage of the boundary line 149 is detected, the reading sensor 120 is moved and stopped to the document reading position P1 (FIG. 10) separated from the detection position by a predetermined distance L1.

  Here, the fixed distance L1 may be specified by the drive time of the second drive motor 205 after the passage of the boundary line 149 is detected, and if the second drive motor 205 is a pulse motor, the drive is performed. It may be specified by the number of pulses, or the movement amount of the read sensor 120 may be directly detected and specified.

  The control unit 201 controls the transport drive unit 202 to drive the first drive motor 204 simultaneously with the control of the read sensor drive unit 203 and rotates the pickup roller 108 to feed the read document 107 into the ADF unit 41. put out. The fed-out original document 107 is a single sheet due to the interaction between the separation roller 109 and the separation pad 110, that is, the interaction of the separation pad 110 with the brake action on the original document 107 and the delivery action at the separation roller 109 side. , And conveyed along the paper conveyance path 112 toward the registration roller 127.

  When the control unit 201 detects the passage of the conveyed original 107 to be conveyed by the passage information received from the registration sensor 132, the control unit 201 drives the second drive motor 205 after a predetermined time to rotate the registration roller 127 which is stopping. As a result, the read original document 107 which has passed through the registration sensor 132 gradually comes into contact with the nip portion between the registration roller 127 and the pressure roller 128 whose leading end is stopped, and the vicinity of the leading end gradually begins to bend. It will be in a corrected state. The control unit 201 rotates the registration roller 127 at this timing, and sequentially sends out the read original document 107 in a skew-corrected state from the leading end to the downstream side of the nip portion.

  When the control unit 201 detects the passage of the read original 107 conveyed by the registration roller 127 and the pressure roller 128 according to the passage information received from the scan sensor 134, the control unit 201 conveys the document by a predetermined time after this detection. The reading process of the image of the read original 107 is started at the reading timing predicted that the predetermined reading start position of the read original 107 reaches the original reading position P1 (FIG. 10) where the reading sensor 120 reads.

  Note that this reading timing may be simultaneous with the timing when the scan sensor 134 detects the passage of the read document 107 being conveyed. In that case, processing of cutting out an image of a certain length from the tip of the read image is performed.

  The read original 107 moves on the ADF reading glass 115 by obtaining a conveying force by the resist roller 127 and the pressure roller 128. At this time, the read original 107 moves the original reading position P1 without rising from the ADF reading glass 115 by the action of the original pressing member 116 that receives the urging force to the ADF reading glass 115 by the spring 117, so a stable image is obtained. Reading processing is possible.

  The read original 107 which has passed the original reading position P 1 is guided by the original scooping member 121, conveyed in the direction of the discharge roller 118 and the pressure roller 119, and discharged onto the stacker 122.

  Similarly, when image reading of all read originals 107 placed on the original tray 106 sequentially fed out is completed, the control unit 201 returns the read sensor 120 to the standby position again and ends the ADF read mode. .

  Next, the control unit 201 (FIG. 9) receives a read instruction by pressing the read instruction button 210 by the operator, and the read document 107 is placed on the document tray 106 based on the document placement information received from the document sensor 113. The flatbed reading mode, which starts when it is confirmed that it is not placed, will be described.

  In the flatbed reading mode, the control unit 201 determines that the operator sets the reading original 107 on the original placement surface 123a (FIG. 2) on the FB reading glass 123 and flattens the reading instruction button 210 and presses it. Start bed reading mode.

  In the flatbed reading mode, the control unit 201 first instructs the reading sensor driving unit 203 to move the reading sensor 120 in the arrow C direction at a predetermined speed from the standby position. The control unit 201 monitors the read data received from the read sensor 120 while moving in the direction of the arrow C, and detects the passage of the boundary line 171 (FIG. 7) of the second reference member 148.

  When the passage of the boundary line 149 is detected, the movement in the same direction (sub scanning direction) is continued when the reading sensor 120 moves to the document reading start position P2 (FIG. 2) separated from the detection position by a fixed distance L2. As it was, reading of the read original 107 placed on the original placement surface 123a (FIG. 2) on the FB reading glass 123 was started, and reading of the original was ended by movement in the subscanning direction of the predetermined area (arrow C direction). After that, the reading sensor 120 is returned to the standby position again to end the flatbed reading mode.

  In the present embodiment, the registration roller 127, the pressure roller 128, the scan sensor 134, and the first reference member 135 are disposed in the conveyance guide unit 124 that can swing with respect to the ADF frame 125, but the invention is limited thereto. It is possible to take various aspects such as arranging each of these members on the ADF frame 125 itself.

According to the image reading apparatus 30 of the present embodiment described above, the document reading position P1 in the ADF reading mode is set at a distance L1 from the boundary line 149 of the first reference member 135 disposed in the conveyance guide unit 124. Since the distance from the scan sensor 134 to the document reading position P1 in the transport path is always constant regardless of the state at the closing position of the ADF unit 41, it is possible to suppress the variation in the reading tip position of the read document.
Further, since the conveyance guide unit 124 is accurately positioned with respect to the image reading unit 31, traveling accuracy such as skewing of the document at the document reading position P1 is increased, so that the reading accuracy can be improved.

Second Embodiment
FIG. 11 is a schematic configuration diagram for describing a main part configuration of the image reading device 330 in a state in which the ADF unit 341 is closed in the image reading device 330 according to the second embodiment of the present invention.

  The main difference between the image reading apparatus 330 and the image reading apparatus 30 according to the first embodiment shown in FIGS. 2 to 10 is the configuration of the conveyance guide unit 424. Therefore, parts in common with the image reading device 30 described above are attached with the same reference numerals, or the drawings are omitted to omit the description, and different points will be mainly described.

  Here, the registration roller 427 is configured to be held by the ADF frame 425 and rotationally driven, and the conveyance guide plate 426 of the conveyance guide unit 424 as the conveyance unit is also coaxial with the registration roller 427, the ADF frame It is rotatably held by 425.

  A pressure roller 428 disposed at a position to be in pressure contact with the registration roller 427 and driven by the conveyance guide plate 426, and a scan sensor that detects the passage of a read original document conveyed by the registration roller 427 and the pressure roller 428. A first reference member 135 is provided as a reference of the reading position when reading the read original document 107 conveyed by the ADF unit 341.

  The transport guide plate 426 is biased in the arrow direction F by a compression spring 411 suspended in a compressed state with the ADF frame 425. Further, the transport guide plate 426 is provided with an arcuate long hole 412 into which a guide post 410 to be planted in the ADF frame 425 is fitted, and its rotation is guided and the rotation range is restricted.

  In the above configuration, in the ADF reading mode, the reading sensor 120 is moved and stopped to the document reading position P1 (FIG. 10) separated from the boundary line 149 of the first reference member 135 by the fixed distance L1. When the resist roller 427 and the pressure roller 428 detect the read original 107 passing through this, after a predetermined time elapses from this detection, that is, the predetermined reading start point of the read original 107 conveyed by the registration roller 427 is the reading sensor 120 The reading process of the image of the read original 107 is started at the reading timing predicted to reach the original reading position P1 at which the reading is performed.

As described above, according to the image reading device 330 of this embodiment, the document reading position in the ADF reading mode at a distance L1 from the boundary line 149 of the first reference member 135 disposed in the conveyance guide unit 424 Since P1 is determined, the distance from the scan sensor 434 to the document reading position P1 in the conveyance path is always constant regardless of the state at the closing position of the ADF unit 41, so that the variation in the reading tip position of the read document can be suppressed. .
Further, since the registration roller 427 is provided on the ADF frame 425, a special drive transmission mechanism to the registration roller 427 is not necessary, and the configuration can be simplified.

  In the embodiment described above, an example has been described in which the present invention is applied to a composite apparatus including an image printing unit and an image reading apparatus, but the present invention is not limited to this. And so on.

DESCRIPTION OF SYMBOLS 1 MFP, 10 image printing unit, 21 left stay, 22 right stay, 25 operation panel, 30 image reading device, 31 image reading unit, 41 ADF unit, 44 ADF rotating shaft, 106 document tray, 107 document to be read, 108 Pick-up roller, 109 separation roller, 110 separation pad, 111 exterior member, 112 sheet conveyance path, 113 document sensor, 114 lower guide, 115 ADF reading glass, 115a first main surface, 16 document pressing member, 117 coil spring , 118 ejection roller, 119 pressure roller, 120 reading sensor, 121 document pick-up member, 122 stacker, 123 reading glass for FB, 123a document placement surface, 124 conveyance guide unit, 125 ADF frame, 1 5a front side chassis 126 transport guide frame 126a front side chassis 126b rear side chassis 127 resist roller 127a passive gear 128 pressure roller 129 resist spring 130a bearing 130b bearing 131 resist sensor lever 132 resist Sensor, 133 scan sensor lever, 134 scan sensor, 135 first reference member, 136 front positioning boss, 137 rear positioning boss, 138 frame, 139 front positioning hole, 140 rear positioning long hole, 141 left boss, 142 right boss, 143 left boss hole, 144 right boss hole, 145 plate-like convex portion, 146 spring receiving member, 147 spring, 148 second reference member, 149 boundary line, 150 light shielding plate, 151 Light shielding plate, 155 guide member, 160 notch hole, 161 elongated hole, 171 boundary line, 181 motor support lever, 182 biasing member, 201 control unit, 202 conveyance drive unit, 203 reading sensor drive unit, 204 first drive motor, 205 second drive motor, 205a drive gear, 206 third drive motor, 210 instruction button, 330 image reader, 341 ADF unit, 410 guide post, 411 compression spring, 412 arc long hole, 424 transport guide unit, 425 ADF Frame, 426 conveyance guide plate, 427 registration roller, 428 pressure roller.

Claims (7)

A planar transparent member that transmits light;
A feeding unit that can be opened and closed with respect to the transparent member;
A reading unit configured to read an original fed by the feeding unit via the transparent member at a reading position, and to be movable from a position different from the reading position to the reading position;
An image reading unit comprising the transparent member and the reading unit;
A drive control unit for controlling the drive of the reading unit;
The feeding unit is
A placement unit on which the document is placed;
A transport unit configured to transport the document from the placement unit toward a position read by the reading unit;
A first document detector that detects the document being conveyed;
A first reference member for setting the reading position;
The transparent member includes a document placement surface on which a reading document is placed;
The image reading unit movably holds the reading unit in a predetermined movement area in the sub scanning direction to read the document placed on the document placement surface, and includes a second reference member.
The drive control unit
Moving the reading unit to the reading position based on the reading result of the first reference member by the reading unit ;
When the reading unit is moved in the predetermined movement area, reading of the document placed on the document placement surface is started based on the movement distance from the second reference member. Reader. Before SL drive control unit at a predetermined timing based on detection of the document by the first document detector, characterized by starting the reading process of the document that the reading unit located at the reading position is involved The reader according to claim 1. The feeding unit is
A transport unit comprising a registration roller pair configured to transport the document by configuring the transport unit, the first document detector, and the first reference member;
The reader according to claim 2, further comprising: a frame that holds the transport unit in a pivotable manner. Before SL transport unit comprises an engagement portion,
The image reading unit includes an engaged portion that engages with the engaging portion.
4. The apparatus according to claim 3, wherein when the feeding unit is in the closed position, the engaging portion and the engaged portion are engaged, and the conveyance unit is positioned with respect to the image reading unit. Reader. The feeding unit is
A frame rotatably holding the registration roller;
And a transport unit rotatably held coaxially with the registration roller by the frame.
The transport unit is
A pressure roller that contacts the registration roller;
The first document detector;
The reader according to claim 4, further comprising: the first reference member. The conveying unit comprises a conveying guide for guiding the document to said transparent member, according to claim 3 or 5, wherein in that a first reference member to a position opposite to the transparent member of said conveying guide Reader. A composite apparatus comprising the reader according to any one of claims 1 to 6 .

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