JP4328759B2 - Sheet-like member conveying device and document double-sided reading device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like member conveying device and a document double-sided reading device used in an apparatus for handling sheet-like members such as a copying machine, a facsimile machine, an image reading device, or a complex machine of these, and in particular, a pair of rollers A sheet-like member conveying apparatus that conveys a sheet-like member such as a document into the apparatus and discharges the sheet-like member using the pair of rollers, and a document using the same The present invention relates to a double-sided document reading apparatus that performs both-side reading.

  Among the reading devices that read a sheet-like document, in particular, in a document duplex reading device that scans both sides of a document, after the first surface of the document is read, the document is reversed by a so-called switchback method, Many of them read the second surface on the back side of the first surface.

  FIG. 6 shows an outline of the conveyance system of such a document double-sided reading apparatus. A predetermined number of documents (not shown) are set on the document tray 101, and document feed roller pairs 102 and 103 are arranged on the leading end side. A first guide plate 104 is disposed on the exit side of the pair of document feed rollers 102 and 103 so that the fed document 105 is guided between the pair of document feed rollers 106 and 107. A second guide plate 108 that changes the path downward is disposed on the exit side of the first document transport roller pair 106, 107, and the document 105 that has passed through the first document transport roller pair 106, 107 is moved to the second side. Is guided between the pair of document conveying rollers 109 and 110. An image reading unit 112 that reads an image using a third guide plate 111 and a gap (not shown) is disposed on the exit side of the second document conveying roller pair 109 and 110. Accordingly, the document 105 that has passed through the second document transport roller pair 109, 110 is transported along the third guide plate 111, and image information is read. When reading only one side, the document 105 that has been read reaches the document discharge roller pair 116, 117 between the third document transport roller pair 113, 114 and the fourth guide plate 115, from here. It is discharged to the discharge tray 118. The discharge tray 118 does not have to be arranged downward as shown in this figure, and may be arranged in parallel with the document tray 101, for example.

  FIG. 7 is a diagram for explaining an initial state of the switchback method when both sides of a document are read. The document 105 whose first surface has been read through the path described with reference to FIG. 6 stops when the trailing edge passes through the document discharge roller pair 116 and 117, and this time the document discharge roller pair. The rotations 116 and 117 are reversed. As a result, the original 105 sent out from the pair of original discharge rollers 116 and 117 to the inside of the apparatus passes above the transport path switching piece 121. Note that, depending on the document reading device, the document partially discharged to the discharge tray 118 is not switched back, but is discharged to a special tray such as an intermediate tray, and sent again from here to the inside of the device. There are also things. Also at this time, the backward feeding may be started in a state where a part of the trailing edge is left without completely discharging the document to the intermediate tray.

FIG. 8 shows a state where the second side of the switched-back original is being read. The document 105 that has passed through the transport path switching piece 121 is guided by the fifth guide plate 123 and sent between the first document transport roller pair 106 and 107, from which the second document transport roller pair 109 and 110 is sent. And the third document conveying roller pair 113 and 114 are sequentially conveyed. At this time, the second surface of the original 105 is read by the image reading unit 112. The original 105 on which the reading of the second surface has been completed is discharged to a discharge tray 118 through a pair of original discharge rollers 116 and 117. Of course, at this time, the document discharge rollers 116 and 117 are rotated in the direction of discharging the document 105.

  By the way, in such a document transport device, when the total length of the document is long with respect to the transport path for reading the second surface of the document, the document discharge rollers 116 and 117 are used to feed and discharge the same document. "Passing" occurs.

  FIG. 9 shows the “passing” state of the same document. With the leading edge of the document 105 protruding from the document discharge roller pair 116, 117, the trailing edge has not yet passed the document discharge roller pair 116, 117. In this state, the document discharge roller pair 116 and 117 are separated from each other, and “passing” between feeding and discharging of the same document 105 is possible. As described with reference to FIG. 7, the document discharge roller pair 116 and 117 rotate in the reverse direction to that when the document 105 is fed into the apparatus for reading the second surface. A sensor (not shown) detects this at a predetermined time when the leading edge of the document 105 approaches the document discharge roller pair 116 and 117, and separates the document discharge roller pair 116 and 117. Thereafter, after the trailing edge of the document 105 passes through the document discharge roller pair 116 and 117, the document discharge roller pair 116 and 117 are brought into contact with each other again, and this time, the rotation in the direction in which the document 105 is sent to the discharge tray 118 is performed. Will do.

  FIG. 10 shows an example of a conventional document conveying device that contacts and separates the document discharge roller pair. In FIG. 10, the same parts as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the document conveying device 131, a document (not shown) for reading the second surface passes between the document discharge roller pairs 116 and 117 and is conveyed in the direction of the arrow 132, and passes through the path described in FIG. The document passes again between the document discharge rollers 116 and 117 and is discharged in the direction of arrow 133.

  In the document conveying device 131, the rotation shaft 134 of the driven roller 117 constituting the document discharge roller pair 116, 117 is rotatably attached to one end portion of the V-shaped link member 135. A plunger 137 of an electromagnetic solenoid 136 is attached to the other end of the link member 135 via a stretchable member 138 such as a spring material. At the intermediate position of the link member 135, a separation rotating shaft 139 is rotatably attached.

  In the document conveying device 131 having such a configuration, when the electromagnetic solenoid 136 is not excited, the document discharge roller pairs 116 and 117 are in contact with each other. A timing control circuit (not shown) excites the electromagnetic solenoid 136 in a state in which “passing” between feeding and discharging of the same document occurs in the document discharge roller pair 116 and 117. Then, the plunger 137 is attracted by the electromagnetic solenoid 136 and the document discharge roller pair 116 and 117 are separated. When the “passing” is resolved, the electromagnetic solenoid 136 is demagnetized, and the document discharge roller pair 116 and 117 are returned to the state of rolling contact with each other again.

  FIG. 11 shows another example of a conventional document conveying device for bringing a pair of document discharge rollers into and out of contact with each other. The same parts as those in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the document conveying device 141, the linear motion of the plunger 137 that moves forward and backward from the electromagnetic solenoid 136 is converted into the rotational motion of the first separating rotary shaft 143 by the link mechanism 142. A first arm 144 is attached to one end of the first separation rotating shaft 143. A rotation shaft support member 147 protruding in the same direction as the second arm 145 is fixed to the second separation rotation shaft 146 attached to one end of the second arm 145 interlocking with the first arm 144. Yes. A rotation shaft 148 of the document discharge roller 116 is rotatably attached to the rotation shaft support member 147.

  Therefore, when the electromagnetic solenoid 136 is excited and the plunger 137 is attracted, the first arm 144 pushes the second arm 145 upward. As a result, the document discharge roller 116 that has been in rolling contact with the document discharge roller 117 is lifted upward and the two are separated. The excitation timing of the electromagnetic solenoid 136 is controlled so that “passing” between feeding and discharging the same document occurs in this state.

In addition to the document conveying device using the electromagnetic solenoid 136 shown in FIGS. 10 and 11, it has been proposed to rotate the cam by a drive motor (see, for example, Patent Document 1). In this proposal, the roller constituting the upper side of the document discharge roller pair is lifted upward by the protruding portion of the cam so as to be separated from the roller constituting the lower side.
JP-A-11-30882 (paragraph 0042, FIG. 3)

  Incidentally, in the document conveying apparatus shown in FIGS. 10 and 11, an electromagnetic solenoid, a circuit component for driving the electromagnetic solenoid, and a sensor for setting a driving timing are required. Further, the document conveying apparatus disclosed in Patent Document 1 requires a motor for rotating the cam, a speed change mechanism, and a motor drive circuit. Therefore, there is a problem that not only the cost of the document conveying device is increased by these parts, but also the reliability of the document conveying device is lowered by the addition of these electric components.

  In the above description, the case where the first side and the second side of the document are sequentially switched and read is described. Even when reading only one side of a part of a document, if it is necessary to align pages as with other documents that are scanned on both sides, the transport described in FIG. In this case, since the “passing” state of the same document as shown in FIG. 9 occurs, the same problem occurs.

  Therefore, an object of the present invention is to use no special electrical component when the same member is simultaneously transported in the opposite direction between a pair of rollers that transport the sheet-like member in a certain direction and in the opposite direction. Another object of the present invention is to provide a document conveying device in which these rollers are separated and a document double-sided reading device using the document conveying device.

In the present invention, (b) a first roller pair that conveys a sheet-like member in a specific direction or in the opposite direction in a state of rolling contact with each other, and (b) a loop that uses the first roller pair as a start point and an end point. And (c) a first sensor which is disposed at a predetermined position in the middle of the loop-shaped conveyance path and detects the leading end when the first roller pair conveys the sheet-like member in the specific direction described above. And (d) a second roller pair that continues the conveyance of the sheet-like member in the specific direction as described above when the first sensor detects the leading edge of the sheet-like member, and (e) A rotation transmitting means for transmitting the rotation of one roller constituting the second roller pair to a neighboring roller disposed in the vicinity of the first roller pair, and (f) when the neighboring roller is rotating, Of the first roller pair Of the first roller pair spacing means for mechanically separating the mentioned above the rotating shaft by moving in a direction away from the axis of rotation of the other roller of the roller is provided in the sheet conveying device.

In the present invention, (a) a pair of discharge rollers that conveys the document in a specific direction or in a discharge direction opposite to the original while being in contact with each other, and (b) the discharge roller pair as a start point and an end point, A loop-shaped conveyance path in which a reading unit for reading a document is arranged, (c) a document supply tray for supplying a document, and (d) a front of the document supply tray and a reading unit for the loop-shaped conveyance path. The first surface conveyance path used when reading the first surface of the original document fed from the document supply tray and (e) the loop conveyance path is connected to the position junction point. A first sensor that detects the leading edge of the document, and (f) a pair of document transport rollers that continues transporting the document in the specific direction as described above when the first sensor detects the leading edge of the document. When the document described above (g) When the document supplied from the feed tray is transported using the transport path for the first surface, and the leading end of the document is detected by the first sensor, the rotation of the document transport roller pair is started. A first surface reading control means for conveying the first surface of the document in a direction to be read by the reading unit and reading the first surface; and (h) the first surface reading control means by the first surface reading control means. When the second surface is read after the reading of the first surface is completed, the reading of the first surface is completed and before the trailing edge of the document conveyed in the discharge direction by the discharge roller pair is discharged. use as a path for start backhaul the path to confluence were different above the path by inverting the document to the discharge roller pair from the the reading unit in the loop-shaped transport path and the pair of discharging rollers A document backhaul control means for conveying to the particular direction that the Te, (i) when it is detected by the first sensor described above is conveyed in a specific direction the document is the by this document backhaul control unit, a document described above A rotation transmitting means for transmitting the rotation of one of the rollers constituting the conveying roller pair to a nearby roller disposed in the vicinity of the discharge roller pair; and (n) the discharge roller pair described above when the adjacent roller is rotating. A separation unit that mechanically separates the discharge roller pair by moving the rotation shaft of one of the rollers in a direction away from the rotation shaft of the other roller, and (l) the document reverse feed control unit. When the original reaching the junction point is detected by the first sensor, the first conveyance of the original is started by starting the rotation of the original conveying roller pair. A second surface reading control means for reading the second surface by conveying the second surface as a surface opposite to the first surface in a direction to be read by the reading unit, and (1) the first sensor described above When the trailing edge of the original document is detected , the original double-sided reading device is provided with a separation release means for releasing the separation of the separation means and using the discharge roller pair as a base point .

  As described above, according to the present invention, a pair of document transport rollers that inherits transport of a document or sheet-like member from a pair of discharge rollers or a first roller that transports the document or sheet-like member in two directions according to timing. Alternatively, the pair of discharge rollers or the first roller is separated in conjunction with the start of rotation of the second roller pair. As a result, even if a “passing” occurs when the leading edge of the document or sheet-like member finishes transporting the loop-shaped transport path and returns to the discharge roller pair or the first roller, it cannot be transported by friction. Does not cause such troubles. In addition, since the separation operation is mechanically performed, there is no risk of malfunction due to noise or circuit failure, and a highly reliable device can be manufactured.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows the main part of an original conveying apparatus according to an embodiment of the present invention from the original conveying roller side. In this document conveying device 201, the same parts as those in FIGS. 6 to 11 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the document conveying apparatus 201 of this embodiment, an electromagnetic clutch 202 is connected to one of the first document conveying roller pairs 106 and 107. As a result, a driving force from a driving motor (not shown) is transmitted to the document conveying roller 107 via the electromagnetic clutch 202. A first pulley 204 is attached to one end of the document conveying roller shaft 203 to which the document conveying roller 107 is attached. A second pulley 205 with a built-in torque limiter is attached to the second separating rotary shaft 146, and a pulley connecting belt 206 is stretched over both pulleys 204 and 205. One end of a rotary shaft support member 147 is fixed to the second separation rotary shaft 146. The other end of the rotation shaft support member 147 is located at a predetermined distance from the central axis of the second separation rotation shaft 146, and the rotation shaft 148 of the document discharge roller 116 is rotatably attached to the rotation shaft support member 147. It has been. Accordingly, when the first pulley 204 rotates in the direction of the arrow 211, one of the document discharge rollers 116 constituting the document discharge roller pair moves upward and forms a document discharge roller pair in a state of rolling contact with the lower side. The other driven roller 117 is separated.

  FIG. 2 shows a main part of the document conveying apparatus shown in FIG. 1 from the discharge roller side. A document conveyance roller control sensor 221 is disposed in the vicinity of the nip portion between the document conveyance roller 107 and the driven roller 106 constituting the first document conveyance roller pair. In this embodiment, the document transport roller control sensor 221 is configured by an optical sensor, and detects when the leading edge of the document approaches the document transport roller 107 and turns on the electromagnetic clutch 202 shown in FIG. . Then, when the trailing edge of the document passes the document conveying roller 107 and the document conveying roller control sensor 221 no longer detects the document, the document is turned off. Therefore, in the document conveying device 201 of this embodiment, the document discharge roller pair 116 and 117 are separated while the document conveying roller 107 is driven.

  FIG. 3 shows a document transport route when the second side of the document is read or page alignment is performed in the document transport apparatus of the present embodiment. A document (not shown) passes between the document discharge roller pair 116 and 117 and travels in the direction of the arrow 132. At this time, the document discharge roller pair 116, 117 is in a rolling contact state. When the leading edge of the document reaches the position of the document transport roller control sensor 221 and is detected by driving the document discharge roller 116, the first document transport roller pair 106 and 107 starts rotating. The rotation of the first document conveying roller pair 106 and 107 causes the document to pass between these and turn downward, and reaches the second document conveying roller pair 109 and 110 to pass therethrough. Then, the image reading unit 112 reads an image on the document.

  By the way, when the first document conveying roller pair 106 and 107 starts to rotate and starts conveying the document, the first pulley 204 shown in FIG. 2 starts rotating from that point, and the second pulley 205 also rotates. Rotate with. As a result, the document discharge roller 116 moves upward and is separated from the driven roller 117 in a state of rolling contact with the lower side. Since the second pulley 205 has a built-in torque limiter, the separated state is maintained thereafter. Therefore, after that, instead of the document discharge roller pair 116, 117, the first document transport roller pair 106, 107 feeds the document into the apparatus.

  In this state, the leading end of the document that has been read passes between the third pair of document conveying rollers 113 and 114. A discharge roller control sensor 223 is disposed on the exit side of the third document conveying roller pair 113 and 114. When the leading edge of the document is detected by the discharge roller control sensor 223, the document discharge roller 116 starts to rotate in the original direction for discharging the document. However, when the document discharge roller 116 starts to rotate in the discharge direction in this manner, the document discharge roller pair 116 and 117 are in a separated state. Therefore, after that, when the leading edge of the document passes through the document discharge roller pair 116, 117, the trailing edge of the document conveyed in the direction of the arrow 132 may not yet pass through the document discharge roller pair 116, 117. . At this time, one document passes through the document discharge roller pair 116 and 117 in a “passing” manner, but no particular problem occurs because the document discharge roller pair 116 and 117 are in the separated state.

  Thereafter, the trailing edge of the document conveyed in the direction of the arrow 132 is detected by the document conveyance roller control sensor 221. After a short time has elapsed from this point, the driving of the document conveying roller 107 is stopped. The reason why a little time has elapsed is that the time required for the trailing edge of the document to pass through the first document conveying roller pair 106 and 107 is taken into consideration. Therefore, depending on the position of the document conveying roller control sensor 221, the driving of the document conveying roller 107 may be stopped at the same timing as this detection.

  When the driving of the document conveying roller 107 is stopped, the rotation of the first and second pulleys 204 and 205 shown in FIG. 2 is stopped, and the document discharge roller 116 presses the document discharge roller 116 against the driven roller 117. It descends by the force of a spring (not shown) and comes into contact with the driven roller 117. When the pulleys 204 and 205 are rotating, the pair of document discharge rollers 116 and 117 are separated from each other by overcoming the spring force. As a result of the rolling contact between the document discharge roller pair 116 and 117 in this way, the leading edge of the document that has passed through the discharge roller control sensor 223 is conveyed in the direction of the arrow 133 by the document discharge roller pair 116 and 117, and is outside the apparatus. Will be discharged. The rotation of the document discharge roller pair 116 and 117 in the discharge direction is performed until a predetermined time elapses after the trailing edge of the document is detected by the discharge roller control sensor 223. Here, the predetermined time is a time from when the trailing edge of the document passes through the discharge roller control sensor 223 to when it completely passes through the document discharge roller pair 116 and 117.

FIG. 4 shows how the document discharge roller is controlled, and FIG. 5 shows how the document transport roller is controlled. The state of the document conveyance control at the time of reading the second side of the document shown in FIG. These controls are performed by a drive control unit having a CPU and a control program (not shown). First, in order to carry a document into the apparatus, the reverse of the document discharge roller 116 is started at a predetermined timing (step S301 in FIG. 4). In this state, the CPU waits for the document transport roller control sensor 221 to detect the leading edge of the document (step S321 in FIG. 5). When the leading edge is detected (Y), the electromagnetic clutch 202 shown in FIG. Energization starts driving of the document conveying roller 106 (step S322). Thereafter, when the original cannot be detected by the original conveying roller control sensor 221, that is, when the rear end is detected (step S323: Y), the predetermined time t ₁ is further passed. (Step S324: Y), the electromagnetic clutch 202 is demagnetized, and the driving of the document conveying roller 106 is stopped (Step S325).

On the other hand, the document discharge roller 116 may stop the reverse rotation after the document transport roller 106 starts transporting the document. However, in this embodiment, such control is not particularly performed, and the leading edge of the document is discharged. When detected by the roller control sensor 223 (step S302: Y in FIG. 4), normal rotation of the document discharge roller 116 is started (step S303). Then, when the discharge of the document is its rear end in progress is detected by the discharge roller control sensor 223 (step S304: Y), after considering the time t ₂ until the document is completely discharged (Step S305: Y) Then, the driving of the document discharge roller 116 is stopped (step S306).

  In the embodiment described above, the power is transmitted using the pulleys 204 and 205, but it is natural that a gear or other power transmission means may be used. As a mechanism for separating the document discharge roller pair 116 and 117 by the rotation of the second separation rotating shaft 146, it is natural that a known mechanism such as a cam can be used.

  Further, in the embodiment, the driving of the document conveying roller 107 is turned on / off using the electromagnetic clutch 202. However, for example, the driving of the document conveying roller 107 is turned on / off by directly controlling on / off of a driving motor. Can also be done.

  According to the embodiment described above, the document discharge roller pair 116 and 117 can be separated without using a heavy electromagnetic component such as a solenoid, so that not only the weight of the document conveying device can be reduced. Since the arrangement of such electromagnetic components can be omitted, it is possible to reduce the size of the apparatus by reducing the component mounting area.

FIG. 3 is a perspective view illustrating a main part of the document conveying device according to the embodiment of the present invention from the document conveying roller side. FIG. 2 is a perspective view illustrating a main part of the document conveying device illustrated in FIG. 1 from a discharge roller side. FIG. 6 is an explanatory diagram of component arrangement showing a document transport route when reading a second surface of a document in the document transport apparatus of the present embodiment. 6 is a flowchart showing how a document discharge roller is controlled in the embodiment. 6 is a flowchart showing how the document conveying roller is controlled in the present embodiment. FIG. 6 is an explanatory diagram showing a state in which a document is sent out from a document tray in order to read a first surface by a conveyance system of a document duplex reading device. FIG. 7 is an explanatory diagram showing an initial state of a switchback method when both sides of a document are read by the apparatus shown in FIG. 6. FIG. 7 is an explanatory diagram illustrating a state where a second surface of a document is being read by the apparatus illustrated in FIG. 6. FIG. 7 is an explanatory diagram showing a “passing” state of the same document in the apparatus shown in FIG. 6. FIG. 10 is a perspective view of a main part illustrating an example of a conventional document conveying device that performs contact and separation of a document discharge roller pair. FIG. 10 is a perspective view of a main part illustrating another example of a conventional document conveying device that contacts and separates a document discharge roller pair.

Explanation of symbols

106, 107 First document conveying roller pair 116, 117 Document ejection roller pair 148 Rotating shaft 147 Rotating shaft support member 201 Document conveying device 202 Electromagnetic clip 203 Document conveying roller shaft 204 First pulley 205 Second pulley 221 Document conveying Roller control sensor 223 Discharge roller control sensor

Claims (5)

A first roller pair that conveys the sheet-like member in a specific direction or in the opposite direction in a state of rolling contact with each other;
A loop-shaped conveyance path having the first roller pair as a start point and an end point;
A first sensor which is disposed at a predetermined position in the middle of the loop-shaped conveyance path and detects the leading end when the first roller pair conveys the sheet-like member in the specific direction;
A second roller pair for continuing conveyance of the sheet-like member on the loop-like conveyance path in the specific direction when the first sensor detects the tip of the sheet-like member;
Rotation transmitting means for transmitting the rotation of one of the rollers constituting the second roller pair to a neighboring roller disposed in the vicinity of the first roller pair;
When the neighboring rollers are rotating, the first roller pair is mechanically separated by moving the rotation shaft of one roller constituting the first roller pair away from the rotation shaft of the other roller. A sheet-like member conveying device comprising: a separating unit that moves the sheet-like member. The sheet-like member conveying device according to claim 1, wherein torque of the rotation movement of the neighboring roller is limited by a torque limiter . When the first roller pair conveys the sheet-like member in the specific direction, the second roller is disposed at a position for detecting the front end of the sheet-like member on the loop-like conveyance path after the first sensor. A sensor,
When the second sensor detects the leading edge of the sheet-like member, it comprises transport direction switching means for switching the transport direction of the sheet-like member by the first roller pair to a direction opposite to the specific direction. The sheet-like member conveying device according to claim 1 . When the first sensor detects the rear end of the sheet-like member, the first sensor includes a separation release unit that releases the separation of the separation unit and uses the first roller pair as a base point. The sheet-like member conveying device according to claim 1. A pair of discharge rollers for conveying the document in a specific direction or in the opposite discharge direction in a state of rolling contact with each other;
A loop-shaped conveyance path in which a reading unit for reading a document is arranged in the middle of the discharge roller pair as a start point and an end point;
A document supply tray for supplying documents,
This document supply tray is connected to the junction point at the position in front of the reading section of the loop-shaped conveyance path, and is used when reading the first surface of the document sent from the document supply tray. Surface conveyance path,
A first sensor that is disposed at the junction of the loop-shaped conveyance path and detects a leading edge of the document;
A pair of document transport rollers for continuing transport of the document in the specific direction on the loop-shaped transport path when the first sensor detects the leading edge of the document;
When the document supplied from the document supply tray is transported using the transport path for the first surface and the leading end thereof is detected by the first sensor, rotation of the pair of document transport rollers is started. A first surface reading control means for conveying the first surface of the document in a direction to be read by the reading unit and reading the first surface;
After reading the first surface by the first surface reading control means, the second surface is read, and after the document which has been read in the first surface and conveyed in the discharge direction by the discharge roller pair The discharge roller pair is reversed before the end is discharged, and the path leading to the junction point different from the path from the reading unit to the discharge roller pair in the loop-shaped conveyance path is defined as a reverse feed start path. A document reverse feed control means to be used and conveyed in the specific direction;
When the original is conveyed in the specific direction by the original reverse control means and detected by the first sensor, the rotation of one roller constituting the original conveying roller pair is arranged in the vicinity of the discharge roller pair. Rotation transmission means for transmitting to the nearby rollers;
Separation means for mechanically separating the discharge roller pair by moving the rotation shaft of one roller constituting the discharge roller pair in a direction away from the rotation shaft of the other roller when the neighboring roller is rotating; ,
When the original reaching the merging point is detected by the first sensor by the original reverse control means, the surface of the original opposite to the first surface is started by starting the rotation of the original conveying roller pair. A second surface reading control means for conveying the second surface as a direction read by the reading unit and reading the second surface;
When the first sensor detects the trailing edge of the document, the separation release means for releasing the separation of the separation means and rolling the discharge roller pair with this as a base point
A double-sided document reading device.

Images