JP4476929B2 - Document reader - Google Patents

Description

  The present invention relates to an original reading apparatus that reads an image from a conveyed original.

  2. Description of the Related Art Conventionally, as a reading method in a document reading apparatus, a document conveying method for reading an image from a conveyed document and a document fixing method for reading an image from a document placed on a platen glass and in a stationary state are known. ing. Of these, in the document transport method, each part of the document is transported in such a manner that the respective parts of the document are in contact with the contact glass in order, and the reflected light image from the contacted portion is sub-scanned by the stationary scanning optical system. The image of the entire area of the original is read by continuously reading.

  Although this document transport method has an advantage that the document can be read at a high speed, if dust or dirt adheres to the contact point on the contact glass with the document, the reflection from the contact point Since the optical image is continuously read in the sub-scanning direction, there is a drawback that black stripes or white stripes extending in the sub-scanning direction are generated in the read image.

In order to cope with this drawback, Patent Document 1 shown below proposes a configuration for reading a conveyed document while moving a contact glass in a sub-scanning direction with respect to a reading unit. This configuration is an attempt to prevent not only the original but also the dirt on the contact glass from being read as black stripes by moving the dirt on the contact glass in the sub-scanning direction during the operation of reading the conveyed original. is there.
JP 2001-272829 (release date: October 5, 2001)

  However, the configuration of Patent Document 1 is merely an attempt to prevent not only the original but also the stain on the contact glass from being read as black stripes by moving the stain on the contact glass in the sub-scanning direction. Therefore, if there is even a slight amount of dirt on the contact glass, even if the situation where the dirt is read as black streaks can be suppressed, the dirt itself is often read as an image in the end. It was difficult to read the image while avoiding the above.

  In addition, the contact glass is glass that is formed in a slit shape and has a very narrow width in the sub-scanning direction, unlike an original table glass that has a size on which an original can be placed. Therefore, it is easy to get dirt from one end of the glass to the other in the sub-scanning direction. If such dirt is attached, the dirt is no matter how the contact glass is moved in the sub-scanning direction. It is difficult to avoid reading the image.

  The present invention relates to a document reading apparatus that reads an image from a document being conveyed, and is capable of reading an image of the document while avoiding dirt adhering to the glass facing the document being conveyed. The purpose is to provide.

  In order to achieve the above object, the present invention provides a document table glass, and a document conveyance device that is disposed on the document table glass and has a document conveyance path having a reading position facing the document table glass, In a document reading apparatus comprising a reading device that reads an image of a document passing through the reading position from the lower side of the document table glass, the document conveying device is configured to be movable on the document table glass. Thus, the position of the original platen glass facing the reading position is changed.

  Thus, even if a part of the platen glass is dirty, the reading position in the document transport path can be made to face the platen glass while avoiding the dirty part of the platen glass. Accordingly, the reading apparatus can read an image of a document passing through a reading position disposed on the upper side of the unclean part of the document table glass from the lower side of the part. Therefore, it is possible to cause the reading device to read the image of the document while avoiding the stain on the platen glass.

  The reading position means a position read by the reading device, and does not mean the position of the reading device.

  In the document reading apparatus of the present invention, in addition to the above configuration, it is preferable that the document table glass is glass having a size at least capable of placing a document.

  According to this configuration, the portion of the platen glass that is overwhelmingly larger in area than the contact glass described above can be selected to face the reading position in the document conveyance path, so that part of the glass is contaminated. Even in such a case, it is possible to easily select a place free from dirt.

  In addition to the above-described configuration, the document reading device of the present invention is arranged downstream of the reading position of the document transport path in the document transport device, and separates the document that has passed through the reading position from the platen glass. It is preferable that a guide surface for guiding in the direction to be formed is configured.

  According to this configuration, since the guide surface is configured on the document transport device side, even if the document transport device is moved, the positional relationship between the reading position in the document transport path and the guide surface. The guide surface can always be arranged on the downstream side of the reading position, and the original that has passed the reading position can be separated from the original platen glass.

  In addition to the above-described configuration, the document reading apparatus of the present invention conveys a document that has passed through the reading position on the downstream side of the reading position of the document conveying apparatus and on the upstream side of the guide surface while separating the document from the platen glass. It is preferable that a separating and conveying means is configured.

  As a result, even when the original is conveyed while contacting the original platen glass at the reading position in the original conveyance path, the original in a state of being separated from the original platen glass can be supplied to the guide surface. . Therefore, the document is easily guided in a direction away from the document table glass on the guide surface.

  As a specific configuration of the separating and conveying means, for example, an electrostatic adsorption roller that adsorbs the original document with an electrostatic force can be cited.

  In addition to the above-described configuration, the document reading apparatus of the present invention includes a belt member that conveys a document that has passed through the document reading position to a discharge tray on the downstream side of the document reading position. Also good.

  As a result, the document that has passed through the document reading position can be discharged onto the sheet discharge tray by the belt member.

  As described above, in the document reading apparatus of the present invention, the document conveying device is configured to be movable on the document table glass, and the position of the document table glass facing the reading position is changed by this movement. It is characterized by that.

  Therefore, there is an effect that it is possible to cause the reading device to read the image of the original while avoiding contamination of the original table glass.

  A document reading apparatus according to an embodiment of the present invention will be described below. FIG. 2 is a schematic diagram showing a cross section of the document reading apparatus 1 according to the present embodiment.

  The document reading device 1 is a scanner configured in an MFP (Multi Function Printer), and is a scanner that reads an image from a document being transported (document transport method).

  As shown in FIG. 2, the document reading device 1 is disposed on a document table glass 2, an automatic document feeder (document transport device) 3 disposed on the document table glass 2, and a document table glass 2 below. The configuration includes a scanner optical system (reading device) 4. That is, the automatic document feeder 3 is disposed on one surface side of the document table glass 2, and the scanner optical system 4 is disposed on the other surface side of the document table glass 2.

  The document table glass 2 is a glass having a size at least capable of placing a document. In the present embodiment, the document table glass 2 is used for contacting a part of the surface of the document to be conveyed in image reading of the document conveyance method.

  In the automatic document feeder 3, a document conveyance path 23 having a reading position A facing the document table glass 2 is formed on the upper side of the document table glass 2. The document is conveyed to the reading position A.

  The scanner optical system 4 is an image reading unit that reads an image of a document passing through a reading position A in the document transport path 23 from the lower side of the document table glass 2.

  That is, the reading position A means a position read by the scanner optical system 4, and does not mean the position of the scanner optical system 4.

  Next, each component provided in the automatic document feeder 3 will be described. On the automatic document feeder 3, a paper feed tray 21 for placing a document P before the image is read by the scanner optical system 4 and a document P after the image is read by the scanner optical system 4 are placed. The configuration includes a paper discharge tray 22 and the above-described document conveyance path 23. The document transport path 23 is formed so as to reach the paper discharge tray 22 from the paper feed tray 21 via the reading position A.

  That is, the document P placed on the paper feed tray 21 is conveyed via the reading position A and is discharged to the paper discharge tray 22.

  In the automatic document feeder 3, a pickup roller 24, a separation roller 25, a document entry sensor 26, a registration roller pair 27, in order from the paper feed tray 21 side (upstream side in the conveyance direction) along the document conveyance path 23, An electrostatic adsorption roller 28, a guide plate 29, a conveyance roller pair 30, and a paper discharge roller pair 31 are arranged. The electrostatic attraction roller 28 is a roller member configured by forming a cylindrical dielectric around the conductive rotation axis, and has a function of conveying the original P while being adsorbed by electrostatic force. It is.

  Further, the above-described reading position A is located downstream of the registration roller pair 27 and upstream of the electrostatic attraction roller 28 in the document conveyance path 23.

  Further, a separating plate 35 is disposed at a position facing the separating roller 25 with the document conveying path 23 interposed therebetween. A white plate 36 for pressing the document P against the document table glass 2 is disposed at the reading position A of the document transport path 23.

  Further, a switching gate 32 for selectively guiding the document discharged from the discharge roller pair 31 to either the intermediate tray 33 or the discharge tray 22 is disposed further downstream of the discharge roller pair 31. ing.

  Next, each component provided in the scanner optical system 4 will be described. The scanner optical system 4 includes a light source 11, mirrors 12, 13, 14, an imaging lens 15, and a CCD (charge coupled device) line sensor 16.

The light source 11 is a lamp for exposing the original P passing through the reading position A. The mirrors 12, 13, and 14 are optical means that reflect reflected light from the document P that passes through the reading position A in a predetermined direction. The imaging lens 15 is an optical means for imaging the reflected light from the original P reflected from the mirror 14 on the input surface of the CCD line sensor 16. The CCD line sensor 16 reads an image of the original P from the reflected light imaged on the input surface. Next, an original reading operation in the original reading apparatus 1 will be described. First, a case where the original P is read on one side will be described.

  First, the user places the document P on the paper feed tray 21. Then, the user inputs a document reading command (or copy command) to the document reading device 1 by pressing a predetermined button (not shown).

  By this input, the original P placed on the paper feed tray 21 is taken out by the pickup roller 24, sent one by one to the downstream side of the original conveyance path 23 by the separation roller 25 and the separation plate 30, and the original conveyance path 23. It will be conveyed in.

  The leading edge and the trailing edge of the document P sent to the separating roller 25 are detected by the document input sensor 26. When the leading edge and the trailing edge of the document P are detected by the document insertion sensor 26, a control device (computer) (not shown) obtains the size of the document P based on information from the document insertion sensor 26.

  After the leading edge and the trailing edge of the document P are detected by the document input sensor 26, the document P is temporarily stopped in contact with the registration roller pair 27. Here, the reason for temporarily stopping is to adjust the timing of sending the document to the reading position A.

  When it is time to send the document P to the reading position A, the registration roller pair 27 is driven and the document P is conveyed toward the reading position A. Further, at the reading position A, the document P is conveyed while being in contact with the document table glass 2 by being pressed against the white plate 36. Here, the scanner optical system 4 exposes the original P, which is in contact with the original table glass 2 by the white plate 36, from the lower surface of the original table glass 2, and reflects the reflected light image from the original P (the original table glass 2). The image of the original P is read based on the reflected light image obtained by transmission.

  Further, on the downstream side of the reading position A, the electrostatic adsorption roller 28 conveys the document P that has passed the reading position A to the guide plate 29 while adsorbing it. As a result, the original P is conveyed while being in contact with the original table glass 2 at the reading position A, but after passing through the reading position A, the original P is separated from the original table glass 2 by being adsorbed by the electrostatic adsorption roller 28. In this state, it is conveyed and guided to the guide plate 29.

  The guide plate 29 is formed with a guide surface that is inclined with respect to the upper surface of the platen glass 2. Specifically, the guide surface is formed so as to guide the document P in the direction away from the document table glass 2 and in the direction in which the conveyance roller pair 30 is arranged. Accordingly, the document P guided to the guide plate 29 is transported to the transport roller pair 30 so as to be separated from the document table glass 2.

  Thereafter, the document P passes through the conveyance roller pair 30 and is discharged to the outside by the discharge roller pair 31. Here, the switching gate 32 in the vicinity of the paper discharge roller pair 31 is switched upward (solid line in FIG. 2), and the document P discharged from the paper discharge roller pair 31 comes into contact with the lower surface of the switching gate 32. Guided to the paper discharge tray 22.

  Next, a case where both sides of a document are read will be described. When reading both sides of a document, first, the surface of the document P is read by the scanner optical system 4 by the same operation as the one-sided reading described above, and the document P is conveyed to the position where the discharge roller pair 31 is arranged.

  The pair of paper discharge rollers 31 sends the conveyed document P to the intermediate tray 33 side instead of the paper discharge tray 22 side. That is, at the time of double-sided reading, the switching gate 32 in the vicinity of the paper discharge roller pair 31 is switched downward (one-dot chain line in FIG. 2), and the original P discharged from the paper discharge roller pair 31 is Is guided in the direction of the intermediate tray 33. However, in this case, the paper discharge roller pair 31 does not completely discharge the original P, but reverses the original P while being nipped, and sends the original P to the reverse conveyance path 34. The original P sent to the reverse conveyance path 34 is sent again from the original conveyance path 23 to the reading position A, and after the reading of the back surface is completed, the original P is output to the discharge tray 22 by the discharge roller pair 31. Become.

  In the document conveying type document reading apparatus as described above, if dust or dirt adheres to the contact area with the document being conveyed on the upper surface of the document table glass, the scanner optical system Since the reflected light image (reflected light image obtained by transmitting through the platen glass 2) is continuously read in the sub-scanning direction, black or white stripes extending in the sub-scanning direction in the read image are read. The problem that occurs occurs.

  Therefore, in the document reading apparatus 1 of the present embodiment, as shown in FIG. 1, the automatic document feeder 3 is configured to move forward and backward (slide) along the E direction on the document table glass 2, and this movement is performed. Thus, the facing position with respect to the reading position A on the platen glass 2 can be changed. Further, when the automatic document feeder 3 is moved, the scanner can be exposed so that the read position A after the movement can be exposed, and the reflected light image from the read position A after the movement can be guided to the CCD line sensor 16. The optical system 4 is displaced appropriately.

  In the document reading apparatus 1 in the state shown in FIG. 2, when the automatic document feeder 3 is moved, for example, in the E direction, a part of the automatic document feeder 3 is placed on the platen glass 2 as shown in FIG. It protrudes further in the E direction side, and the upper surface of the document table glass 2 is exposed on the side opposite to the E direction. Here, the E direction is a direction in which the document P is conveyed at the reading position A (sub-scanning direction) and a direction parallel to the surface direction of the document table glass 2.

  With this configuration, even if a part of the platen glass 2 is soiled, the reading position A in the document transport path 23 is set so as to avoid the soiled part of the document glass 2. Can be face to face. Therefore, the scanner optical system 4 reads an image of the document P passing through the reading position A disposed on the upper surface of the unclean part of the document table glass 2 from the lower side of the part. Therefore, it becomes possible to cause the scanner optical system 4 to read the image of the document P while avoiding the stain on the document table glass 2.

  In addition, in this way, when the scanner optical system 4 reads the image of the document P while avoiding the stain on the platen glass 2, black lines and white lines do not occur in the read image. It can be avoided that the dirt itself is read as an image.

  Further, in the above configuration, the automatic document feeder 3 is movable on the platen glass 2 having a size that allows at least the document P to be placed thereon. Accordingly, since a portion facing the reading position A in the document transport path 23 can be selected from a wide area of the entire platen glass 2 having a size large enough to place the document P, a part of the glass can be selected. Even if there is dirt, it is possible to easily select a place without the dirt.

  In the document reading apparatus 1 shown in FIG. 2, a guide plate 29 having a guide surface for guiding the document P that has passed the reading position A in a direction away from the document table glass 2 is configured. The plate 29 is configured on the automatic document feeder 3 side. As a result, even if the automatic document feeder 3 is moved on the platen glass 2, the positional relationship between the reading position A and the guide plate 29 in the document conveying path 23 does not change, and is always downstream of the reading position A. Thus, the guide plate 29 can be disposed, and the document P having passed through the reading position A can be guided in a direction away from the document table glass 2.

  Further, in the document conveyance path 23 of the automatic document conveyance device 3 shown in FIG. 2, the document P that has passed the reading position A is separated from the document table glass 2 on the downstream side of the reading position A and on the upstream side of the guide plate 29. An electrostatic attraction roller 28 is disposed to convey the sheet. As a result, although the document P is in contact with the document table glass 2 at the reading position A, the document P in a state of being separated from the document table glass 2 can be supplied to the guide surface of the guide plate 29. Therefore, the document P is easily guided in the direction away from the document table glass 2 on the guide surface of the guide plate 29.

  Next, a mechanism for moving the automatic document feeder 3 on the platen glass 2 will be described with reference to FIG. FIG. 5 is a schematic diagram showing an outer surface of the automatic document feeder 3 and a moving mechanism for moving the automatic document feeder 3.

  As shown in the figure, a rack gear 40 extends from the lower outer surface of the automatic document feeder 3 along the E direction. The rack gear 40 meshes with a worm gear 41 having the E direction as a rotation axis.

  Here, the worm gear 41 receives torque from a prime mover (motor) 42 through gears 43 and 44, and rotates based on this torque. When the worm gear 41 rotates, the automatic document feeder 3 moves in the E direction or in the direction opposite to the E direction. By switching the rotation direction of the worm gear 41, the moving direction of the automatic document feeder 3 can be switched to either the E direction or the direction opposite to the E direction. In this manner, the automatic document feeder 3 can be moved forward and backward along the E direction on the document table glass 2.

  In the above configuration, for example, the user of the document reading device 1 can move the automatic document feeder 3 forward and backward in the E direction on the platen glass 2 when the motor 42 is turned on. Therefore, the user of the document reading device 1 sequentially exposes the upper surface of the document table glass 2 by moving the automatic document feeder 3 forward and backward in the E direction before using the document reading device 1 (for example, FIG. 3). ), And a dirty spot on the upper surface may be confirmed. Then, after the user moves the automatic document feeder 3 so that the reading position A in the document conveyance path 23 faces a spot on the platen glass 2 that is not dirty, the document reader 1 reads the document. Good.

  The moving mechanism for moving the automatic document feeder 3 is not limited to the form shown in FIG. 5 and can be appropriately changed in design. For example, instead of the worm gear 41, a pinion may be engaged with the rack gear 40, and torque may be transmitted from the prime mover 42 to the pinion. Further, instead of the prime mover 42 and the gears 43 and 44, a handle member for manually rotating the worm gear 41 may be configured.

  In addition, a control device (computer, not shown) that comprehensively controls various components of the document reading device 1 determines whether or not the portion facing the reading position A on the document table glass 2 is contaminated. As a result, if there is dirt, control may be performed to move the automatic document feeder 3. This control process will be described below based on the flowchart of FIG.

  When an instruction to read a document is input from the user, the control device controls the scanner optical system 4 before the document P is transported to the document transport path 23, thereby setting the reading position A in a state where there is no document. Exposure is performed, and data of a reflected light image formed on the CCD line sensor 16 by this exposure is generated as image data for determination (S1). Here, as shown in FIG. 2, when the reading position A in the state where no document exists is exposed, the white plate 36 is exposed, so that the reflected light image from the white plate 36 is reflected on the platen glass 2. The light is transmitted and guided to the CCD line sensor 16.

  Therefore, when there is no dirt at the position facing the reading position A on the platen glass 2, the gradation value of the determination image data obtained in S1 is a value indicating white in all pixels, and the platen glass. In the case where the part facing the reading position A in FIG. 2 is partially contaminated, the gradation value of the pixel corresponding to the contaminated part is a value away from the value indicating white.

  FIG. 6 is a graph showing an example of the gradation value of each pixel in the above-described determination image data. In this graph, the horizontal axis indicates the coordinate value in the main scanning direction of each pixel in the image read by the CCD line sensor 16, and the vertical axis indicates the gradation value. The main scanning direction is a direction perpendicular to the E direction and parallel to the surface of the platen glass 2 and means a pixel arrangement direction in the CCD line sensor 16.

  In the case where a portion of the document table glass 2 facing the reading position A is partially dirty, as shown in FIG. 6, most of the pixels show the maximum gradation value (white), but some of the pixels In this case, the gradation value is greatly reduced. That is, a pixel having a low gradation value is a pixel corresponding to a dirty portion.

  Therefore, the control device determines whether or not there is a gradation value equal to or less than a predetermined threshold in the determination image data (S2). If there is no gradation value equal to or less than the predetermined threshold in the determination image data (NO in S2), the control device determines that the portion facing the reading position A on the platen glass 2 is not soiled. Then, the image of the document P is read by transporting the document P to the document transport path 23 (S3).

  On the other hand, when there is a gradation value equal to or less than the predetermined threshold value in the determination image data (YES in S2), the control device has a stain on the portion facing the reading position A on the platen glass 2. Is determined. Then, the control device controls the on / off of the prime mover 42 to move the automatic document feeder 3 by a predetermined distance along the E direction (S4). After this movement, the control device repeats the processes after S1 again.

  If the above control is performed, the original P is automatically placed so that the reading position A faces a spot on the platen glass 2 before the original P is conveyed to the original conveyance path 23 and the image of the original P is read. The conveying device 3 can be automatically moved.

  Further, according to the document reading device 1 of FIG. 2, the paper discharge tray 22 is configured by the automatic document feeder 3. However, like the document reader 1a of FIG. 4, the automatic document feeder 3a and the document table glass. A paper discharge tray 22a may be configured at an end portion on the E direction side of the document table 38 on which 2a is mounted.

  Further, in the document reading apparatus 1a of FIG. 4, in the automatic document feeder 3a, a conveyor that places the document P that has passed the reading position A on the downstream side of the reading position A and conveys the document P to the paper discharge tray 22a. A belt (belt member) 39 is disposed.

  Specifically, the conveyor belt 39 extends from the reading position A to the E direction side end of the automatic document feeder 3a, and the belt surface 39a on the side where the document is placed faces in the E direction. It is the structure to drive.

  According to this configuration, the document P that has passed the reading position A is placed on the conveyor belt 39. The conveyor belt 39 carries the document P in the E direction. As a result, the document P reaches the end in the E direction of the automatic document feeder 3a, and is then discharged to the discharge tray 22a.

  Further, in the document reading apparatus 1a shown in FIG. 4, when the automatic document feeder 3a is moved in the E direction, the end of the conveyor belt 39 in the E direction protrudes from the end of the document table 38 as shown in FIG. However, since the end portion of the paper discharge tray 22a protrudes in the E direction side from the end portion of the conveyor belt 39, the original P conveyed by the conveyor belt 39 to the end portion of the conveyor belt 39 is discharged. Guided by the tray 22a, the original P can be discharged onto the paper discharge tray 22a.

  In the above embodiment, the document reading apparatus 1 is described as being configured in the MFP. However, the document reading apparatus 1 is not limited to the configuration configured in the MFP, and is a scanner apparatus including only the document reading apparatus 1. The form may be sufficient, and the form used as the reading apparatus comprised in a facsimile machine may be sufficient.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the embodiments can be obtained by appropriately combining the respective technical means disclosed in the above-described embodiments. The form is also included in the technical scope of the present invention.

  The document reading apparatus of the present invention is suitable for a scanner that reads an image from a document being conveyed.

An original reading apparatus according to an embodiment of the present invention shows a state before the automatic document feeder is moved on the platen glass and a state after the automatic document feeder is moved on the platen glass. It is a schematic diagram. 1 is a schematic diagram showing a cross section of an original reading apparatus according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a cross section of a document reading apparatus according to an embodiment of the present invention, and is a diagram illustrating a state where an automatic document feeder is moved in the sub-scanning direction from the state illustrated in FIG. 2. FIG. 10 is a schematic diagram showing a modification of the document reading apparatus according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a moving mechanism for moving an automatic document feeder included in the document reading apparatus according to the embodiment of the present invention. 6 is a graph showing image data obtained by exposing the original reading position in a state where no original exists at the original reading position. 5 is a flowchart illustrating a processing procedure of a control device that controls the document reading apparatus according to the embodiment of the present invention. FIG. 9 is a diagram showing a modification of the document reading apparatus according to the embodiment of the present invention, in which the automatic document feeder is moved so that the end of the automatic document feeder protrudes beyond the edge of the platen glass. It is a schematic diagram which shows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Original reading apparatus 2 Original platen glass 3 Automatic document feeder (original feeder)
4 Scanner optical system (reading device)
DESCRIPTION OF SYMBOLS 21 Paper feed tray 22 Paper discharge tray 22a Paper discharge tray 23 Document conveyance path 29 Guide plate 39 Conveyor belt (belt member)
A Reading position

Claims (6)

The platen glass,
An original conveying device disposed on the original table glass and having an original conveying path having a reading position facing the original table glass;
In a document reading device comprising a reading device that reads an image of a document passing through the reading position from the lower side of the document table glass,
When the direction parallel to the surface direction of the platen glass and the direction from the upstream side to the downstream side of the document conveyance direction at the reading position is a predetermined direction, the above-described platen glass is stationary on the stationary platen glass. A mechanism for moving the document conveying device forward and backward along the predetermined direction;
The reading device is displaced in accordance with the movement of the reading position by the forward / backward movement of the original conveying device so that an image of the original passing through the reading position can be read before and after the forward / backward movement of the original conveying device. document reading apparatus characterized by being.   2. The document reading apparatus according to claim 1, wherein the document table glass is a glass having a size at least capable of placing a document.   In the document conveying device, a guide surface is provided on the downstream side of the reading position of the document conveying path and guides the document that has passed through the reading position in a direction away from the platen glass. The document reading device according to claim 1, wherein the document reading device is a document reading device.   A separation conveyance unit configured to convey the document that has passed through the reading position while being separated from the platen glass on the downstream side of the reading position and the upstream side of the guide surface of the document conveying device is configured. The document reading device according to claim 3.   5. The document reading apparatus according to claim 4, wherein the separating and conveying means is an electrostatic suction roller that sucks the document with electrostatic force. A paper discharge tray is provided on the downstream side of the original platen glass in the original conveyance direction,
3. The document reading apparatus according to claim 2, wherein the document conveying device includes a belt member that conveys the document that has passed through the reading position to the paper discharge tray.

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