JP2009137716A - Document transfer apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document transfer apparatus that detects ovelapped feed of documents during document transfer and selects whether the overlappingly fed documents should be fed reversely and discharged into the sheet feed tray or whether document transfer should be cancelled. <P>SOLUTION: This document transfer apparatus includes: a transfer control portion 62 for controlling transfer cancellation and reverse feed of documents 8; a document detection portion 50 for detecting overlapped feed of documents 8; an alarm portion 63 for alarming an urge of selection of whether documents 8 should be reversely fed or whether transfer should be cancelled; and a receiving portion 64 for receiving an instruction of reverse feed or cancellation of transfer of documents 8. According to detection of the document detection portion 50, the alarm portion 63 makes an indication. When the receiving portion 64 receives an instruction of reverse feed of documents 8, the transfer control portion 62 reversely feeds the documents 8 and discharges the documents 8 into the sheet feed tray 15. When the receiving portion 64 receives an instruction of transfer cancellation, on the other hand, the transfer control portion 62 is taken as a document transfer apparatus 4 cancelling transfer of the documents 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a document transport device, and more specifically, detects a double feed of a document during transport of the document, and after the detection, feeds the double fed document backward and discharges it to a document supply tray, or transports a document. The present invention relates to a technique of a document conveying apparatus to be canceled.

2. Description of the Related Art Conventionally, there is known an original conveying apparatus that is provided in an image reading apparatus such as a facsimile machine and separates a plurality of stacked originals one by one and conveys them to a predetermined position (for example, an image reading position). This document transport device separates and transports a plurality of documents stacked on a document supply tray one by one. However, this document transport device may not be able to separate and transport the documents one by one depending on the size and thickness of the stacked documents. In this way, a plurality of originals being conveyed without being separated is referred to as double feeding of originals. 2. Description of the Related Art There is known a document conveying device including a detection unit that detects a double feed of such a document when such a double feed occurs (for example, Patent Document 1).
JP 2004-23427 A

  The document conveying device (document reading device) in Patent Document 1 is configured such that when document double feeding is detected during document conveyance, document conveyance is interrupted and the document is fed back to the document supply tray and discharged. ing. However, in the document conveying device in Patent Document 1, when the detection unit detects the double feeding of the document, the document is always fed back and discharged to the document supply tray. For this reason, for example, when a thin document with low elasticity is double-fed, the document is fed back to the document supply tray, so that an excessive force is applied to the document, and the document is bent or torn. There was a problem that damage occurred. In addition, when a document having a sufficient thickness is double-fed, the document is not easily damaged during reverse feeding, but the double-fed document is always automatically fed back toward the document supply tray. Therefore, for example, when the manuscript is an important document, it has not been possible to prevent damage to the manuscript due to reverse feeding of the manuscript.

  The present invention has been made to solve such a problem, and detects whether or not a double feed of a document at the time of document conveyance is detected, and whether or not the double fed document is reversely fed and discharged to a document supply tray according to the detection result. An object of the present invention is to provide a document transport device that can select whether to stop transport of a document.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, the document feeder according to the first invention is
A transport control unit that controls stopping and reverse feeding of a document;
An original detection unit for detecting double feeding of originals;
An informing unit for informing the user to select whether to reversely feed the document or to stop conveyance;
An accepting unit that accepts an instruction to cancel reverse feeding or conveyance of a document,
Upon detection of the document detection unit, the notification unit performs the notification, and when the reception unit receives an instruction to reversely feed the document, the conveyance control unit feeds the document back to the document supply tray. The document conveying apparatus is characterized in that the conveyance of the document is stopped when the reception unit receives an instruction to cancel the conveyance.

An original conveying apparatus according to a second invention is the original conveying apparatus according to the first invention.
The document detection unit has a function of detecting the thickness of a multi-feed document,
When the document is thicker than a predetermined thickness, the conveyance control unit causes the document to be reversely fed,
When the document is thinner than a predetermined thickness, the transport control unit stops the transport of the document.
Here, the predetermined thickness is a thickness that allows the document to be fed back to the document supply tray without causing damage such as bending or tearing.

  As effects of the present invention, the following effects can be obtained.

  In the first aspect of the invention, the notifying unit gives a notification upon detection of the document detecting unit, and the transport control unit, when the receiving unit receives an instruction to reverse the original, reverses the original and supplies the original supply tray. When the receiving unit accepts an instruction to cancel conveyance, the conveyance of the original is stopped. Therefore, the user reversely feeds the double-fed original to the original supply tray according to the detection result. It is possible to select whether to discharge or stop the conveyance of the document. Therefore, it is possible to select a document discharge method according to the shape, thickness, etc. of the document that has been double-fed.

  In the second aspect of the invention, the document detection unit has a function of detecting the thickness of the multi-fed document, and when the document is thicker than a predetermined thickness, the conveyance control unit causes the document to be reversely fed. When the original is thinner than the predetermined thickness, the conveyance control unit stops the conveyance of the original, and therefore, when an original with a thickness that cannot be reversely fed (thin original) is double-fed, The document is not fed back to the document supply tray. For this reason, for example, when a thin document having a small elasticity and a thickness is double-fed, damage such as bending or tearing of the document due to reverse feeding can be prevented.

  Hereinafter, a document conveying device 4 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an overall configuration of a multifunction peripheral 100 including a document conveying device 4 according to the present invention, and FIG. 2 is a side view of the image reading device 1. In the following, a multifunction machine 100 having a facsimile function and a copying function of a copying machine will be described as the multifunction machine 100 having the document conveying device 4 according to the present invention. However, the present invention is not limited to the embodiments. It can be applied to a facsimile machine, a copier, and the like.

  As illustrated in FIG. 1, the multifunction peripheral 100 includes an image reading device 1 and an image forming device 2. An operation panel 3 of the multifunction device 100 is attached to one side of the image reading apparatus 1, and the attached side of the operation panel 3 is hereinafter referred to as a front side in the multifunction device 100.

  The image reading apparatus 1 includes a document conveying device 4 and an image reading unit 5. The image reading apparatus 1 can be used as a flat bed type image reading apparatus that places a document 8 on a platen glass 7 and reads a stationary document. The image reading apparatus 1 can also be used as a sheet feed type image reading apparatus that performs reading while conveying the document 8 by the document conveying device 4.

  As shown in FIG. 1, the document conveying device 4 is configured on one end side of the upper part of the document pressing cover 6, and includes a document conveying unit 14, a document supply tray 15, a document discharge tray 16, a document detection unit 50, and the like. It is equipped with. The originals 8 placed on the original supply tray 15 are taken out one by one by the original conveying unit 14 and conveyed to the inside of the original conveying apparatus 4, and after the image of the original 8 is read at the image reading position 9, It is discharged to the discharge tray 16.

  As shown in FIG. 2, the image reading unit 5 has a light source 10 that irradiates light to an image reading position 9 that is a position for reading an image of the document 8 below the platen glass 7, and reflected light from the document 8 in a predetermined manner. Reflecting mirrors 11, 11, 11 for guiding the reflected light in the direction of the light beam, a condensing lens 12 for converging the reflected light, and a charge coupled device 13 for converting the converged light into an electrical signal and outputting it.

  The image forming apparatus 2 is disposed below the image reading apparatus 1 and includes an image recording unit 17 and paper feed cassettes 18 and 18 disposed below the image recording unit 17. The image recording unit 17 is configured by an electrophotographic printer, and is configured to be able to record an image of the document 8 output by the image reading unit 5 and a received image by fax or the like on a recording sheet. A recording paper discharge tray 19 of the image forming apparatus 2 is formed on the front side of the image recording unit 17.

  The document conveyance unit 14, the document supply tray 15, the document discharge tray 16, and the document detection unit 50 constituting the document conveyance device 4 will be described in detail. The document transport unit 14 transports the document 8 by various transport rollers. As shown in FIG. 2, the document conveying section 14 includes a pickup roller 20, feed rollers 21, 22, 23, 27, press rollers 24, 25, 26, 28, 30, 31, and discharge rollers 32, 32. , And a detection body 51. The pickup roller 20 is a roller that takes out the uppermost document 8 out of the documents 8 placed on the document supply tray 15 and feeds the document 8 into the document conveying device 4. Then, the document 8 is conveyed while the document 8 is nipped by the feed rollers 21, 22, 23, 27 and the press rollers 24, 25, 26, 28, 30, 31. The discharge rollers 32 and 32 are rollers for discharging the document 8 conveyed by the feed rollers 21, 22, 23, 27 and the press rollers 24, 25, 26, 28, 30, 31 to the document discharge tray 16.

  The document supply tray 15 is for placing a document 8 to be fed into the document conveying device 4. As shown in FIG. 1, the document supply tray 15 is a flat plate-like member formed in a substantially rectangular shape in plan view, and is provided so as to be inclined in a direction (arrow 38 in FIG. 2) for receiving the document 8. The document supply tray 15 has document stoppers 39 and 39 formed at the edges, and operates one or both of the document stoppers 39 and 39 in a direction orthogonal to the conveyance direction of the document 8. The document 8 placed on the document supply tray 15 is positioned.

  The document discharge tray 16 accumulates the documents 8 discharged from the inside of the document conveying device 4. The document discharge tray 16 is integrally formed on the upper surface of the document pressing cover 6 and is configured to be substantially parallel to the document supply tray 15.

  The document detection unit 50 detects the double feed of the document 8 and the thickness of the double fed document by using the attenuation of ultrasonic waves when passing through the document 8. , And a detection unit 53 (FIGS. 6 and 8). The detector 51 includes a transmitter 54 that transmits ultrasonic waves, and a receiver 55 that receives the ultrasonic waves transmitted from the transmitter 54, converts the ultrasonic waves into electrical energy, and outputs a signal. Yes. The transmitter 54 and the receiver 55 are provided orthogonal to the conveyance direction of the document 8.

  The detection unit 53 includes a double feed detection unit 56 and detects whether or not the document 8 is double fed. Specifically, the attenuation of the ultrasonic wave during double feeding is calculated through experiments or the like, and a predetermined threshold is determined in advance based on the calculation result. Then, the threshold value is compared with the attenuation of the ultrasonic wave with respect to the actually conveyed document, and it is detected whether the document 8 is double-fed by the difference between the two.

  FIG. 3 is a schematic plan view of the vicinity of the detection body 51. In FIG. 3, the document 8 is conveyed from the downward direction in the figure to the upward direction in the figure (the direction of arrow 36 in FIG. 3). The detector 51 is disposed between the press roller 24 located closest to the document supply tray 15 and the press roller 25 adjacent to the press roller 24. The detector 51 includes a right side (54a), a central portion (54b), and a left side in the vertical direction (width direction of the conveyance path 37) with respect to the conveyance direction of the document 8 (direction of arrow 36 in FIG. 3). It is arrange | positioned at three places of a part (54c). The receivers 55a, 55b, and 55c of the detector 51 are disposed directly below the corresponding transmitters 54a, 54b, and 54c. The interval is such that the thickness can be detected. Since the transmitter 54 and the receiver 55 are arranged at three locations on the right side, the center, and the left side, for example, when the document 8 transports only the center of the transport path 37 (FIG. 3). Even when the original 8a) or the original 8 is transported on one side of the transport path 37 (the original 8b in FIG. 3), the original 8 passes between any of the transmitters 54 and the receivers 55. The original detection unit 50 receives ultrasonic waves with attenuation when the original 8 is double-fed by any one of the receivers 55 (55a, 55b, 55c), so that the conveyed original 8 is double-fed. It is detected that Therefore, the document detection unit 50 can detect the double feed of the original 8 and the thickness of the double fed original 8 regardless of the conveyance state of the original 8, the size of the original 8, and the like.

  Next, the control mechanism 60 of the document conveying device 4 according to the first embodiment of the present invention will be described. FIG. 6 is a block diagram of the control mechanism 60 of the document conveying device 4 according to the first embodiment. Each operation of the document conveying device 4 is controlled by a control mechanism 60. The control mechanism 60 includes a control unit 61, a conveyance control unit 62, a detection unit 53, a notification unit 63, and a reception unit 64, and the control unit 61 is connected to each unit of the control mechanism 60. Each part of the control mechanism 60 is controlled.

  The conveyance control unit 62 controls the conveyance of the document 8 during normal conveyance, and also controls the stopping and reverse conveyance of the document 8 when the document 8 is double-fed. The conveyance control unit 62 includes a conveyance motor 66. The conveyance motor 66 is connected to the conveyance rollers (pickup roller 20, feed rollers 21, 22, 23, 27, and discharge roller 32) of the document conveyance unit 14. The conveyance control unit 62 controls the rotation of the conveyance rollers (pickup roller 20, feed rollers 21, 22, 23, 27, and discharge roller 32) of the document conveyance unit 14 by controlling the conveyance motor 66.

  The detection unit 53 detects whether or not the document 8 is double-fed as described above. The double feed detection unit 56 of the detection unit 53 is connected to the detection body 51 and detects whether or not the document 8 is being double fed based on a signal transmitted by the detection body 51.

  The notification unit 63 receives the detection signal from the detection unit 53 and notifies the user to select whether to reversely feed the document 8 to the document supply tray 15 or to stop the conveyance. The notification unit 63 notifies the double feed of the document 8 when the document 8 is double fed. Furthermore, the notification unit 63 notifies a “manual discharge operation” indicating that the user has selected manual as the discharge operation of the document 8 that has been multi-fed. The notification unit 63 is connected to the operation panel 3 and performs, for example, notification by sound, notification by screen display, and the like via the operation panel 3.

  The accepting unit 64 is connected to the transport control unit 62. When the accepting unit 64 accepts an instruction to reversely feed the document, the accepting unit 64 transmits a signal that causes the transport control unit 62 to reversely feed the document 8. On the other hand, when the reception unit 64 receives an instruction to stop conveyance, the reception unit 64 transmits a signal for stopping conveyance of the document 8 to the conveyance control unit 62.

  FIG. 7 is a flowchart of control in the document conveying device 4 according to the first embodiment. Unless otherwise limited, the operation of each unit of the control mechanism 60 is performed via the control unit 61.

  When a signal for starting image reading of the document 8 is transmitted, the transport control unit 62 controls the transport motor 66 to start transporting the document 8 (S1) (see FIG. 4). When the conveyance of the document 8 is started, the detection unit 53 detects whether or not the document 8 is double-fed (S2). At this time, the double feed detector 56 detects whether or not the document 8 is double fed based on the signal transmitted by the detector 51. When the double feed is not detected (S2-No), the control unit 61 determines whether the image of the document 8 is read by the image reading unit 5 (S3). When the reading of the image is not completed (S3-No), the detection unit 53 continues to detect whether or not the document 8 is being double-fed (S2). When the image reading is completed (S3-Yes), the conveyance control unit 62 controls the conveyance motor 66 to discharge the document 8 to the document discharge tray 16, and ends the image reading of the document 8.

  When the detection unit 53 detects double feed (S2-Yes), the detection unit 53 transmits a detection signal indicating that the document 8 is being double fed to the conveyance control unit 62. Upon receiving the detection signal, the conveyance control unit 62 stops the conveyance motor 66 (S4), and temporarily stops the conveyance of the document 8. After the conveyance motor 66 stops, the notification unit 63 notifies an error that the document 8 is being double-fed (S5). After notifying the double feed error, the notification unit 63 performs notification for prompting selection of whether to reversely feed the document 8 to the document supply tray 15 or to stop the conveyance. Then, the control unit 61 starts control (double feed detection error operation) when the original is double fed (S6). When the control unit 61 starts control at the time of double feeding, the user determines whether or not to perform a “manual” operation in which the user manually discharges the document 8 without reversely feeding the document 8 to the document supply tray 15. Select (S7).

  When the user does not select the “manual” operation, that is, when the accepting unit 64 does not accept the instruction to stop the conveyance (No in S7), the user automatically reversely feeds the document 8 to the document supply tray 15. It is selected whether or not to perform the “automatic” operation of discharging (S8). When the user does not select the “automatic” operation, that is, when the user does not select the “manual” operation or the “automatic” operation (S8-No), the control mechanism 60 allows the user to select one of the operations. (S7).

  When the user selects the “manual” operation, that is, when the receiving unit 64 receives an instruction to stop conveyance (S7—Yes), the notification unit 63 notifies “manual discharge operation” (S9). At this time, the conveyance control unit 62 stops conveying the document 8, and holds the document 8 in a stopped state. When the “manual discharge operation” is notified, the controller 61 determines whether or not the document 8 is discharged from the conveyance path 37 (S10). When the document 8 is not discharged (S10-No), the notification unit 63 continues to notify “manual discharge operation” (S9). When the document 8 is discharged (S10-Yes), the notification unit 63 deletes the notification of the double feed error (S11).

  When the user does not select the “manual” operation (S7-No) and selects the “automatic” operation, that is, when the receiving unit 64 receives an instruction to reversely feed the document 8 (S8-Yes), the transport control unit 62 reverses the rotation of the conveyance motor 66 to reversely feed the document 8 (see FIG. 5) and discharges it to the document supply tray 15 (S12). When the document 8 is discharged to the document supply tray 15, the notification unit 63 deletes the notification of the double feed error (S11).

  According to the document conveying device 4 according to the first embodiment described above, the notification unit 63 gives a notification upon detection of the detection unit 53 of the document detection unit 50, and the conveyance control unit 62 receives the document 8 from the reception unit 64. When the reverse feed instruction is received, the original 8 is reversely fed and discharged to the original supply tray 15, and when the accepting unit 64 receives an instruction to stop the conveyance, the conveyance of the original 8 is stopped. Therefore, the user can select whether to reversely feed the multi-fed original 8 and discharge it to the original supply tray 15 or to stop the conveyance of the original 8 according to the detection result. Therefore, a method for discharging the document 8 can be selected in accordance with the shape, thickness, etc. of the document 8 that has been double fed.

  Next, the document conveying device 4 according to the second embodiment of the present invention will be described. FIG. 8 is a block diagram of the control mechanism 60 of the document feeder 4 according to the second embodiment. Of the control mechanism 60, the detection unit 53 is significantly different from that of the first embodiment. Of the control mechanism 60, the control unit 61, the conveyance control unit 62, the notification unit 63, and the reception unit 64 have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  The detection unit 53 includes a double feed detection unit 56 and a thickness detection unit 57. The double feed detection unit 56 is connected to the detection body 51, and the attenuation of the ultrasonic waves detected by the detection body 51. Based on the above, it is detected whether or not the document 8 is double fed.

  The thickness detection unit 57 is connected to the detection body 51 and detects the thickness of the multi-fed document 8 based on the ultrasonic attenuation detected by the detection body 51. Specifically, the attenuation of ultrasonic waves during double feeding is calculated for documents of various thicknesses through experiments and the like, and a predetermined threshold is determined in advance based on the calculation result. Then, the threshold value is compared with the attenuation of the ultrasonic wave with respect to the actually conveyed document, and the thickness of the document 8 is detected based on the difference between the two.

  FIG. 9 is a flowchart of control in the document conveying device 4 according to the second embodiment. Unless otherwise limited, the operation of each unit of the control mechanism 60 is performed via the control unit 61.

  When a signal for starting image reading of the document 8 is transmitted, the transport control unit 62 controls the transport motor 66 to start transporting the document 8 (S20) (see FIG. 4). When the conveyance of the document 8 is started, the detection unit 53 detects whether or not the document 8 is double-fed (S21). At this time, the double feed detector 56 detects whether or not the document 8 is double fed based on the signal transmitted by the detector 51. When the double feed is not detected (S21-No), the control unit 61 determines whether the image of the document 8 has been read by the image reading unit 5 (S22). If the reading of the image has not been completed (S22-No), the detection unit 53 continues to detect whether or not the document 8 is being double fed (S21). When the image reading is completed (S22-Yes), the conveyance control unit 62 controls the conveyance motor 66 to discharge the document 8 to the document discharge tray 16, and ends the image reading of the document 8.

  When the detection unit 53 detects double feeding (S21-Yes), the detection unit 53 transmits a detection signal indicating that the document 8 is being double fed to the conveyance control unit 62. Upon receiving the detection signal, the conveyance control unit 62 stops the conveyance motor 66 (S23) and temporarily stops the conveyance of the document 8. After the conveyance motor 66 stops, the notification unit 63 notifies an error that the document 8 is being double-fed (S24). When the notification unit 63 notifies the double feed error, the notification unit 63 performs notification that prompts the user to select whether to feed the document 8 back to the document supply tray 15 or to stop the conveyance. Then, the control unit 61 starts control (double feed detection error operation) when the original is double fed (S25). When the control unit 61 starts control at the time of double feeding, the detection unit 53 detects the thickness of the double-fed document 8 (S26). At this time, the thickness detector 57 detects the thickness of the multi-fed document 8 based on the signal transmitted from the detector 51.

  When it is detected that the double-fed original 8 is thicker than the predetermined thickness (Yes in S26), the user manually discharges the original 8 without returning the original 8 to the original supply tray 15 manually. Is selected (S27). Here, the notification unit 63 may notify that the document 8 has a thickness that can be reversely fed. The predetermined thickness refers to a thickness that allows the document 8 to be fed back to the document supply tray 15 without causing damage such as bending or tearing.

  When the user does not select the “manual” operation, that is, when the accepting unit 64 does not accept the instruction to stop the conveyance (No in S27), the user automatically reversely feeds the document 8 to the document supply tray 15. It is selected whether or not to perform an “automatic” operation of discharging (S28). When the user does not select the “automatic” operation, that is, when the user selects neither the “manual” operation nor the “automatic” operation, the control mechanism 60 is in a standby state until the user selects one of the operations. (S27).

  When the user selects the “manual” operation, that is, when the receiving unit 64 receives an instruction to stop the conveyance (S27—Yes), the notification unit 63 notifies the “manual discharge operation” (S29). At this time, the conveyance control unit 62 stops conveying the document 8, and holds the document 8 in a stopped state. When the “manual discharge operation” is notified, the control unit 61 determines whether or not the document 8 is discharged from the conveyance path 37 (S30). When the document 8 is not discharged (S30-No), the notification unit 63 continues to notify “manual discharge operation” (S29). When the document 8 is discharged (S30-Yes), the notification unit 63 deletes the notification of the double feed error (S31).

  When the user does not select the “manual” operation (S27-No) and selects the “automatic” operation, that is, when the receiving unit 64 receives an instruction to reversely feed the document 8 (S28—Yes), the conveyance control unit 62 reverses the rotation of the conveyance motor 66 to reversely feed the document 8 (see FIG. 5) and discharges it to the document supply tray 15 (S32). When the document 8 is discharged to the document supply tray 15, the notification unit 63 deletes the notification of the double feed error (S31).

  When the detection unit 53 detects that the double-fed document 8 is thinner than a predetermined thickness (No in S26), the notification unit 63 notifies “manual discharge operation” (S29). At this time, the detection unit 53 transmits a detection signal indicating that the double-fed document 8 is thinner than a predetermined thickness to the conveyance control unit 62. When the conveyance control unit 62 receives the detection signal, the conveyance control unit 62 stops conveying the document 8 and holds the document 8 in a stopped state.

  As described above, when the double-fed original 8 is thinner than a predetermined thickness, that is, when the double-fed original 8 is not thick enough to be fed back to the original supply tray 15, the user 8 discharges the original 8. Only the manual operation of manually discharging is performed, the conveyance motor 66 is not rotated in reverse, and the document 8 is held in a stopped state by stopping the conveyance of the document 8 itself.

  When the “manual discharge operation” is notified (S29), the control unit 61 determines whether or not the document 8 is discharged from the conveyance path 37 (S30). When the document 8 is not discharged (S30-No), the notification unit 63 continues to notify “manual discharge operation” (S29). When the document 8 is discharged (S30-Yes), the notification unit 63 deletes the notification of the double feed error (S31).

  According to the document conveying device 4 according to the second embodiment described above, the detection unit 53 of the document detection unit 50 has a function of detecting the thickness of the document 8 that has been multi-fed so that the document 8 has a predetermined value. When the thickness is larger than the thickness, the conveyance control unit 62 reversely feeds the document 8 and discharges it to the document supply tray 15. When the document 8 is thinner than a predetermined thickness, the conveyance control unit 62 stops the conveyance of the document 8. Therefore, when the document 8 having a thickness that cannot be reversely fed (the thin document 8) is double fed, the document 8 is not fed back to the document supply tray 15. Therefore, for example, when a thin document 8 having a small elasticity and a thickness is double-fed, damage such as bending or tearing of the document 8 due to reverse feeding can be prevented.

1 is a perspective view of a multifunction machine 100 provided with a document conveying device 4 according to the present invention. 2 is a side view of the image reading apparatus 1. FIG. FIG. 3 is a schematic plan view of the vicinity of a detection body 51. FIG. 6 is a schematic side view of the vicinity of a detection body 51 when a document 8 is conveyed. FIG. 6 is a schematic side view of the vicinity of the detection body 51 when the document 8 is reversely fed. 3 is a block diagram of a control mechanism 60 of the document feeder 4 according to the first embodiment. FIG. 7 is a flowchart of control in the document conveying device 4 according to the first embodiment. FIG. 10 is a block diagram of a control mechanism 60 of the document feeder 4 according to the second embodiment. 10 is a flowchart of control in the document feeder 4 according to the second embodiment.

Explanation of symbols

4 Document Conveying Device 8 Document 50 Document Detection Unit 62 Conveyance Control Unit 63 Notification Unit 64 Reception Unit

Claims (2)

A transport control unit that controls stopping and reverse feeding of a document;
An original detection unit for detecting double feeding of originals;
An informing unit for informing the user to select whether to reversely feed the document or to stop conveyance;
An accepting unit that accepts an instruction to cancel reverse feeding or conveyance of a document,
Upon detection of the document detection unit, the notification unit performs the notification, and when the reception unit receives an instruction to reversely feed the document, the conveyance control unit feeds the document back to the document supply tray. In addition, when the accepting unit accepts an instruction to cancel conveyance, the document conveying apparatus is configured to stop conveying the document. The document detection unit has a function of detecting the thickness of a multi-feed document,
When the document is thicker than a predetermined thickness, the conveyance control unit causes the document to be reversely fed,
The document transport apparatus according to claim 1, wherein when the document is thinner than a predetermined thickness, the transport control unit stops the transport of the document.

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