JP2020001897A - Medium conveying device and image reading device - Google Patents

Abstract

To prevent a medium bound by a binding tool from being conveyed to a medium conveyance path.SOLUTION: The medium conveying device contains: a medium placing part for placing a medium; a medium supply part for supplying the medium to a medium conveyance path; a detection part which detects conveyance abnormality caused in the medium in association with supply of the medium to the medium conveyance path by the medium supply part, to generate a detection signal; and a medium state determination processing part which receives the detection signal of the detection part to determine whether or not the medium is bound by a binding tool. Based on the determination by the medium state determination processing part, conveyance of the medium is stopped, so that occurrence of paper jam and breaking of the medium when the medium is delivered can be prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medium transport device and an image reading device.

  2. Description of the Related Art Conventionally, an image reading apparatus such as a scanner, a copier, a facsimile, and a multifunction peripheral is provided with an automatic document feeder (ADF) as a medium transport apparatus for transporting a document as a medium. In the automatic document feeder, documents of various sizes placed on a document placement unit are fed out one by one and fed to a scanner unit (for example, see Patent Document 1).

JP 2017-149504 A

  However, the conventional automatic document feeder can detect that the documents are overlapped when a plurality of documents are conveyed in a document conveyance path where one document is normally conveyed. When an original bound by a stapler such as a stapler (registered trademark) or a clip is conveyed, it is not possible to detect that the original is bound. As a result, a paper jam occurs when the original is fed, or the original is broken.

  The present invention solves the problem of the conventional automatic document feeder, and provides a medium feeder and an image reading device capable of preventing a medium bound by a binding device from being fed to a medium feed path. The purpose is to do.

  Therefore, in the medium transport device of the present invention, a medium placement unit for placing a medium, a medium supply unit that supplies the medium to the medium transport path, and a medium supply path of the medium by the medium supply unit. Detecting a conveyance abnormality occurring in the medium due to the supply of the recording medium, and generating a detection signal; and a medium state determination process of receiving the detection signal of the detection section and determining whether the medium is bound by a binding device. And a part.

  According to the present invention, in a medium transport device, a medium placement unit for placing a medium, a medium supply unit that supplies the medium to a medium transport path, and a medium supply path of the medium by the medium supply unit. Detecting a conveyance abnormality occurring in the medium due to the supply of the recording medium, and generating a detection signal; and a medium state determination process of receiving the detection signal of the detection section and determining whether the medium is bound by a binding device. And a part.

  In this case, when the detection unit detects a transport abnormality that occurs in the medium due to the supply of the medium to the medium transport path by the medium supply unit and generates a detection signal, the medium state determination processing unit receives the detection signal, Since it is determined whether or not the medium is bound, the conveyance of the medium is stopped based on the determination by the medium state determination processing unit. Therefore, it is possible to prevent paper jams and breakage of the medium when the medium is fed out.

FIG. 2 is a control block diagram of the image reading device according to the embodiment of the present invention. 1 is a conceptual diagram of an image reading device according to an embodiment of the present invention. FIG. 3 is a plan view of a main part of the automatic document feeder according to the embodiment of the present invention. It is a perspective view of a rotation lever in an embodiment of the invention. FIG. 4 is a plan view of a main part of the automatic document feeder showing a state in which a plurality of documents whose front ends are bound by a binding device according to the embodiment of the present invention are placed on a document table. FIG. 5 is a cross-sectional view of a main part of the automatic document feeder showing a state in which a plurality of documents whose front ends are bound by the binding device according to the embodiment of the present invention are placed on a document placing table. FIG. 5 is a cross-sectional view of a main part of the automatic document feeder showing a state in which the document is bent in the embodiment of the present invention. FIG. 4 is a plan view of a main part of the automatic document feeder showing a state in which the document is bent in the embodiment of the present invention. FIG. 4 is a plan view of a main part of the automatic document feeder showing a state in which a plurality of documents whose rear ends are bound by a binding device according to the embodiment of the present invention are placed on a document table. FIG. 5 is a cross-sectional view of a main part of the automatic document feeder showing a state in which a plurality of documents whose rear ends are bound by a binding device according to the embodiment of the present invention are placed on a document table. FIG. 5 is a cross-sectional view of a main part of the automatic document feeder showing a state in which the document is turned over according to the embodiment of the present invention. 6 is a plan view of a main part of the automatic document feeder showing a state in which the document is turned over according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an image reading device and an automatic document feeder as a medium feeding device provided in the image reading device will be described.

  FIG. 2 is a conceptual diagram of the image reading apparatus according to the embodiment of the present invention, FIG. 3 is a plan view of a main part of an automatic document feeder according to the embodiment of the present invention, and FIG. It is a perspective view.

  In the figure, reference numeral 10 denotes an image reading device, Bd denotes a main body of the image reading device 10, that is, an apparatus main body, and 12 denotes a cover serving as a lid rotatably disposed with respect to the apparatus main body Bd.

  The apparatus main body Bd is disposed on an upper surface of the apparatus main body Bd, and is a flat bed as a first document supporting portion formed of a transmission plate for mounting a book-like document (not shown) or a sheet-like document (not shown). And a scanner unit 16 as a reading unit movably disposed below the flatbed 14.

  Further, the cover 12 includes a scanner cover 17 that opens and closes the flatbed 14 with swinging, and a plurality of sheets as a medium formed integrally with the scanner cover 17 above the scanner cover 17. An automatic document feeder (ADF) 18 that automatically conveys a document P in a shape of an arrow is provided.

  The scanner unit 16 includes a reading sensor (not shown) provided to extend in the scanning direction. When reading an image of a document placed on the flatbed 14, the scanner unit 16 serves as a home position set in the apparatus main body Bd. When reading the image of the document P which is placed at the reading position Ha and is conveyed by the automatic document feeder 18, the document P is moved below the flatbed 14 in the sub-scanning direction (the direction of arrow A).

  The automatic document feeder 18 is rotatably disposed on a document table 24 serving as a medium placement section for placing the document P thereon and as a second document support section. A pickup roller 26, which is brought into contact with the front end of the original P placed on the mounting table 24 and feeds out the originals P one by one, is rotatably arranged at the front end of the original mounting table 24, The originals P fed out by the rollers 26 are separated one by one and supplied to the original transport path Rt1 as a medium transport path, that is, a pair of paper feed rollers m1 as a medium supply unit for feeding paper, and paper feeding in the original transport path Rt1. A transport roller pair m2 rotatably disposed downstream of the roller pair m1 for transporting the document P, and rotatably disposed downstream of the transport roller pair m2 in the document transport path Rt1 to transport the document P The pair of transport rollers m3 and the downstream of the pair of transport rollers m3 in the document transport path Rt1 are disposed in contact with the flatbed 14 and opposed to the reading position Ha, and the document P is placed on the flatbed 14. An original pressing member 31 to be pressed, a pair of conveying rollers m4 rotatably disposed downstream of the original pressing member 31 in the original conveying path Rt1 and conveying the original P, and a downstream rotating side of the conveying roller pair m4 in the original conveying path Rt1. There is a discharge roller pair m5 and the like, which are freely disposed and discharge the document P to a stacker St as a document discharge section formed on the upper surface of the scanner cover section 17.

  A pair of guides GL, GR for restricting the movement of the document P placed on the document placing table 24 in the width direction is provided on both edges of the document placing table 24. In addition, it is arranged movably in the left-right direction according to the size of the document P.

  The document transport path Rt1 has a “U” shape, and the document P is fed by a pair of paper feed rollers m1 and transported downward in the apparatus main body Bd along the document transport path Rt1. After passing through the document pressing member 31, the sheet is conveyed upward.

  The paper feed roller pair m1 is disposed on the outer edge side of the document transport path Rt1, and is disposed on the inner edge side of the document transport path Rt1 as a paper feed roller 27 as a paper feed member for feeding the document P. And a separation roller 28 as a separation member for separating the document P.

  The pair of transport rollers m2 to m4 and the pair of discharge rollers m5 each include a roller disposed on the outer edge of the document transport path Rt1 and a roller disposed on the inner edge of the document transport path Rt1. As shown in FIG. 3 (only the conveying roller pair m2 is shown in FIG. 3), each roller section includes a shaft sh1 and rollers ri disposed at a plurality of positions in the length direction of the shaft sh1. (I = 1, 2,...). Note that the feed roller pair m1, the transport roller pairs m2 to m4, and the discharge roller pair m5 constitute a transport member that transports the document P.

  A document sensor s1 as a first medium detection unit is disposed at a position above the document table 24 and close to the pickup roller 26 so as to face the document P, and a paper feed roller in the document conveyance path Rt1. A paper feed sensor s2 as a second medium detection unit is provided downstream of the paper feed roller pair m1 and in proximity to the paper feed roller pair m1, and a third paper feed sensor downstream of the paper feed sensor s2 in the document transport path Rt1. A double feed sensor s3 as a medium detecting unit is disposed in proximity to the pair of conveying rollers m2, and a scanning timing sensor s4 as a fourth medium detecting unit is provided downstream of the pair of conveying rollers m3 in the document conveying path Rt1. Is disposed close to the document pressing member 31.

  The document sensor s1 determines whether the document P is placed on the document table 24, and the paper feed sensor s2 detects the front end of the document P supplied to the document transport path Rt1, thereby detecting the document P. Is supplied to the document transport path Rt1. The double feed sensor s3 includes a transmitting sensor qs disposed on the inner edge of the document transport path Rt1 and a receiving sensor qr disposed on the outer edge of the document transport path Rt1. It is determined whether or not a plurality of documents P are conveyed on the road Rt1 in an overlapping manner. Then, the scan timing sensor s4 detects the front end of the document P and takes the timing for reading the image of the document P, that is, the reading timing.

  In order to determine whether or not a plurality of documents P are conveyed in an overlapping manner, the transmission-side sensor unit qs generates and transmits an ultrasonic wave to the reception-side sensor unit qr via the document conveyance path Rt1. The side sensor unit qr receives the ultrasonic wave transmitted from the transmission side sensor unit qs and converts it into an electric signal. In the present embodiment, an ultrasonic sensor made of a piezoelectric ceramic is used as each of the transmission-side sensor unit qs and the reception-side sensor unit qr.

  By the way, when the original P placed on the original placing table 24 is bound by a binding tool such as a stapler (registered trademark) needle or clip, the pickup roller 26 feeds out the original P on the original placing table 24. However, the paper cannot be fed one by one by the paper feed roller pair m1. As a result, when the document P is fed out, a paper jam occurs or the document P is broken.

  Therefore, in the present embodiment, when the document P bound by the binding device is fed out by the pickup roller 26 and the sheet feeding by the sheet feeding roller pair m1 is started, the document P is generated with the sheet feeding. In this embodiment, the first conveyance abnormality which is a deformation, the conveyance of the original P is stopped by detecting the bending of the original P, and a paper jam occurs when the original P is fed out, or the original P Is prevented from being broken.

  For this purpose, a rotation lever 35 as a deflection detecting unit and as a swing member is swingably disposed between the pickup roller 26 and the sheet feed roller pair m1 above the document placing table 24. The rotation lever 35 extends in the width direction of the document P, and is rotatably disposed at a shaft sh2, and at a plurality of positions in the length direction of the shaft sh2, and in the present embodiment, at four positions. A lever 37 is formed to protrude rearward and has an “L” shape, and each lever 37 includes a first arm am1 extending obliquely downward from the shaft sh2, and A second arm am2 extends obliquely upward from the tip of the first arm am1.

  In the present embodiment, a deflection sensor s5 serving as a first detection unit is provided at a predetermined position on the document table 24 in the present embodiment, upstream of the separation roller 28 in the document conveyance path Rt1 so as to face the lever 37. Is arranged.

  When the original P is bent and the original P comes into contact with the rotating lever 35, the rotating lever 35 is rotated, and the bending sensor s5 detects the rotation of the rotating lever 35 to generate the original P. The deflection is detected, a detection signal is generated, and sent to a control unit 80 (FIG. 1) described later. Note that a photo sensor can be used as the bending sensor s5.

  Further, in the present embodiment, when the document P bound by the binding device is fed out by the pickup roller 26 and the sheet feeding by the sheet feeding roller pair m1 is started, the document P is generated with the sheet feeding. In the present embodiment, the conveyance of the document P is stopped by detecting the turn-up of the document P, and a paper jam occurs when the document P is fed out. Is prevented from being broken.

  For this purpose, in the present embodiment, at both edges of the document placing table 24, the regulating members 43 project from the predetermined height portions of the guides GL and GR inward, and face each other. 44 are formed. Each of the restriction members 43 and 44 is a first restriction portion p1 extending in parallel with the document table 24, and a second restriction portion is extended obliquely upward from the rear end of the first restriction portion p1. And regulates the amount of the document P placed on the document table 24 and the movement of the document P in the height direction.

  Then, at predetermined positions of the regulating members 43 and 44, in this embodiment, at the lower surface of the second regulating portion p2, turn-over sensors s6 and s7 as second detecting portions are attached.

  When the document P is turned up and the document P comes into contact with the turning sensors s6 and s7, the turning sensors s6 and s7 detect the turning up of the document P, generate a detection signal, and send the detection signal to the control unit 80. Note that a push switch, a micro switch, or the like that operates with a light load can be used as the turning sensors s6 and s7. Further, the turning sensors s6 and s7 can be formed by a lever that is turned when the document P is turned and the document P comes into contact, and a photo sensor that is disposed to face the lever.

  Next, a control device of the image reading device 10 will be described.

  FIG. 1 is a control block diagram of the image reading apparatus according to the embodiment of the present invention.

  In the figure, 10 is an image reading device, 16 is a scanner unit, 80 is a control unit for controlling the whole of the image reading device 10, and 81 is a first storage device for temporarily recording various data. , A ROM as a second storage device for recording various control programs, 84 an operation unit, 85 a display unit, and M1 a document transport as a transport drive unit for transporting the document P. A motor 88 is a motor driving unit for driving the document conveying motor M1, a scanner motor M2 is a scanning driving unit for moving the scanner unit 16 in the sub-scanning direction, and 89 is a driving motor for the scanner motor M2. It is a motor drive part for performing.

  Also, s1 is a document sensor, s2 is a paper feed sensor, s3 is a double feed sensor, s4 is a scan timing sensor, s5 is a deflection sensor, and s6 and s7 are turn-up sensors. The double feed sensor s3 is composed of a transmission sensor qs and a reception sensor qr arranged with the document conveyance path Rt1 interposed therebetween, and determines whether a plurality of documents P are conveyed in an overlapping manner. The reference numeral 91 denotes a transmission circuit for transmitting a drive signal to the transmission-side sensor unit qs, and the transmission-side circuit for generating ultrasonic waves in the transmission-side sensor unit qs. The reference numeral 92 denotes a reception-side sensor qr from which the transmission-side sensor unit qs is transmitted. The receiving side circuit converts an electric signal generated by receiving the ultrasonic wave and sends an output signal to the control unit 80.

  The control unit 80 performs various processes by executing a control program recorded in the ROM 82, a document transport processing unit Pr1 as a medium transport processing unit that transports the document P, and an image reading unit that reads an image of the document P. A processing unit Pr2, a document state determination processing unit Pr3 serving as a medium state determination processing unit that determines whether or not a plurality of documents P are bound; a plurality of documents P being bound; A notification processing unit Pr4 or the like for notifying the operator that reading has been stopped is provided.

  Next, the operation of the image reading apparatus 10 will be described.

  When the image reading apparatus 10 reads an image of a book-shaped document or one sheet-shaped document, an operator lifts up the scanner cover unit 17 (FIG. 2) to open the book-shaped document or one sheet of document. The original is placed on the flatbed 14 and the operation unit 84 is operated to press an image reading start button (not shown), or an image reading start signal is sent to the control unit 80 from a host computer (not shown) as a higher-level device. Then, the image reading processing unit Pr2 sends an instruction to the motor driving unit 89, drives the scanner motor M2, and moves the scanner unit 16 in the sub-scanning direction.

  Then, the scanner section 16 reads an image of a booklet original or one sheet of original by a reading sensor.

  Further, in the image reading apparatus 10, when continuously reading images of a plurality of sheet-shaped documents P, when the operator places the document P on the document table 24, the document P comes into contact with the document sensor s1, The document sensor s1 detects the document P and sends a sensor output, that is, a detection signal to the control unit 80. Thus, control unit 80 determines that document P is placed on document table 24.

  Subsequently, when the operator presses the image reading start button of the operation unit 84 or when an image reading start signal is sent from the host computer to the control unit 80, the document transport processing unit Pr1 instructs the motor driving unit 88 And the original transport motor M1 is driven, whereby the pickup roller 26, the feed roller pair m1, the transport roller pairs m2 to m4, and the discharge roller pair m5 are rotated.

  Then, the originals P placed on the original placing table 24 are fed out one by one by the pickup roller 26, separated by the paper feed roller pair m1, and sent to the original transport unit Rt1. At this time, the paper feed sensor s2 detects the front end of the document P and sends a detection signal to the control unit 80.

  When receiving the detection signal, control unit 80 determines that document P has been sent to document transport path Rt1, and document state determination processing unit Pr3 determines whether a plurality of documents P are being transported in an overlapping manner. To this end, the control unit 80 sends a drive signal to the transmission-side sensor unit qs via the transmission-side circuit 91, generates an ultrasonic wave in the transmission-side sensor unit qs, and generates an electric signal generated by the reception-side sensor unit qr. , The output signal generated by the receiving circuit 92 is received, and based on whether the signal level of the output signal is lower than a threshold value, it is determined whether a plurality of originals P are conveyed in an overlapping manner.

  When it is determined that the signal level of the output signal is lower than the threshold value and that the plurality of originals P are not conveyed while being overlapped, the original P is conveyed along the original conveying path Rt1 by the conveying roller pairs m2 and m3, and the scan timing sensor s4 Detects the front end. When the scan timing sensor s4 detects the front end of the document P and sends the generated detection signal to the control unit 80, the image reading processing unit Pr2 moves the document P to the document pressing member 31 after a predetermined time has elapsed. The image of the document P is read at a timing when the document P passes through the flat bed 14.

  Then, the document P for which the image reading has been completed is conveyed on the document conveying path Rt1 by the conveying roller pair m4, and is discharged to the stacker St by the discharge roller pair m5.

  Next, the operation of the image reading apparatus 10 when the document P bound by the binding device is placed on the document placing table 24 will be described. In this embodiment, a case where two documents P are bound by a binding tool will be described.

  First, the operation of the image reading apparatus 10 when the document P whose front end is bound by the binding device is placed on the document table 24 will be described.

  FIG. 5 is a plan view of a main part of an automatic document feeder showing a state in which a plurality of documents whose front ends are bound by a binding device according to the embodiment of the present invention are placed on a document placing table, and FIG. FIG. 7 is a cross-sectional view of a main part of an automatic document feeder showing a state in which a plurality of documents whose front ends are bound by a binding device according to the embodiment are placed on a document table; FIG. FIG. 8 is a cross-sectional view of a main part of the automatic document feeder showing a state in which the document is bent, and FIG. 8 is a plan view of a main part of the automatic document feeder showing a state in which the document is bent in the embodiment of the present invention.

  In the drawing, reference numeral 24 denotes a document table, 26 denotes a pickup roller, 27 denotes a feed roller, 28 denotes a separation roller, 35 denotes a rotation lever, 43 and 44 denote regulating members, GL and GR denote guides, m1 denotes a feed roller pair, m2 is a pair of transport rollers, s1 is a document sensor, s2 is a paper feed sensor, s7 is a turn-up sensor, P1 is the first top document of the documents placed on the document table 24, and P2 is two sheets. .., The third and subsequent documents; Hk, a stapler (registered trademark) for binding the front ends of the documents P1, P2; binding tools such as clips; Ar1, Ar2. Is the deformation that has occurred in the document P1, that is, bending. In this case, the right edges of the front ends of the documents P1 and P2 are bound by the binding device Hk.

  When an operator operates the operation unit 84 (FIG. 1) and presses an image reading start button, or when an image reading start signal is sent from the host computer to the control unit 80, the pickup roller 26 is rotated, and P <b> 1 is sent between the paper feed roller 27 and the separation roller 28.

  At this time, the left edge of the document P1 that is not bound by the binding device Hk is about to be fed by the feed roller 27, but the bound right edge is prevented from being fed by the separation roller 28.

  As a result, a difference occurs in the conveyance force between the left unbound edge of the document P1 and the right edge bound thereto, and the document P1 tries to skew as shown by the broken line in FIG. The movement of the document P1 in the width direction is restricted by the GR.

  As a result, bending Ar1 and Ar2 occur on the left edge side of the document P1.

  When the bending Ar1 occurs, the front end of the document P1 is brought into contact with the rotating lever 35, and the rotating lever 35 is rotated. The bending sensor s5 (FIG. 2) detects the bending Ar1, generates a detection signal, and performs control. Sent to the unit 80. The document state determination processing unit Pr3 of the control unit 80 receives the detection signal and determines that the front ends of the documents P1 and P2 are bound by the binding device Hk.

  Then, the document transport processing unit Pr1 stops the rotation of the pickup roller 26, the paper feed roller pair m1, the transport roller pairs m2 to m4, and the discharge roller pair m5, and the image reading processing unit Pr2 reads the image by the scanner unit 16. The notification processing unit Pr4 displays the message on the display unit 85 to stop the document P1 and the front end of the document P2 and to stop the conveyance of the document P and the reading of the image. Notify others.

  Next, an operation of the image reading apparatus 10 when the document P whose rear end is bound by the binding device is placed on the document placing table 24 will be described.

  FIG. 9 is a plan view of a main part of an automatic document feeder showing a state in which a plurality of documents whose rear ends are bound by a binding device according to an embodiment of the present invention are placed on a document placing table, and FIG. FIG. 11 is a cross-sectional view of a main part of an automatic document feeder showing a state in which a plurality of documents whose rear ends are bound by a binding device are placed on a document placing table according to the embodiment; FIG. FIG. 12 is a cross-sectional view of a main part of the automatic document feeder showing a state where the document is turned over. FIG. 12 is a plan view of a main part of the automatic document feeder showing a state where the document is turned up in the embodiment of the present invention.

  In the drawing, reference numeral 24 denotes a document table, 26 denotes a pickup roller, 27 denotes a feed roller, 28 denotes a separation roller, 35 denotes a rotation lever, 43 and 44 denote regulating members, GL and GR denote guides, m1 denotes a feed roller pair, m2 is a pair of transport rollers, s1 is a document sensor, s2 is a paper feed sensor, s6 and s7 are turn-up sensors, P1 is the first uppermost document among the documents placed on the document table 24, and P2 is The second document, Pj is the third and subsequent documents, Hk is a binding device for binding the rear ends of the documents P1 and P2, and Ar3 and Ar4 are deformations that have occurred in the document P1, that is, turning over. In this case, the right edges of the rear ends of the documents P1 and P2 are bound by the binding device Hk.

  When an operator operates the operation unit 84 and presses an image reading start button, or when an image reading start signal is sent from the host computer to the control unit 80, the pickup roller 26 is rotated and the document P1 is fed. The sheet is sent between the roller 27 and the separation roller 28.

  At this time, the original P1 is separated from the original P2 by the paper feed roller 27 and the separation roller 28 at the front end and is about to be fed, but the rear end is bound to the original P2 by the binding device Hk. As shown in FIGS. 11 and 12, the sheet feeding is prevented, and a turn-up Ar3 occurs at the rear end of the document P1 and a turn-up Ar4 occurs at the rear end of the document P2.

  When the turning-over Ar3 occurs at the rear end of the document P1, the right edge of the rear end of the document P1 is regulated by the restricting member 44, abuts on the turning-over sensor s7, and the turning-over sensor s7 detects the turning-over Ar3. Is generated and sent to the control unit 80. The document state determination processing unit Pr3 of the control unit 80 determines that the rear ends of the documents P1 and P2 are bound by the binding tool Hk.

  Then, the document transport processing unit Pr1 stops the rotation of the pickup roller 26, the paper feed roller pair m1, the transport roller pairs m2 to m4, and the discharge roller pair m5, and the image reading processing unit Pr2 reads the image by the scanner unit 16. The notification processing unit Pr4 displays the message on the display unit 85 to stop the rear ends of the originals P1 and P2 and stop the conveyance of the original P and the reading of the image. Notify the operator.

  As described above, in the present embodiment, the bending sensor s5 and the turning sensors s6 and s7 are configured to bend the document P due to the supply of the document P to the document conveying path Rt1 (FIG. 2) by the pair of paper feed rollers m1. The original state determination processing unit Pr3 receives the detection signal and determines that the original P is bound. Based on the determination by the original state determination processing unit Pr3, The conveyance of the document P is stopped. Therefore, it is possible to prevent a paper jam from occurring when the document P is fed out and to prevent the document P from being broken.

  In this embodiment, each time the original P placed on the original placing table 24 is fed out by the pickup roller 26 and supplied to the original transport path Rt1 by the pair of paper feed rollers m1, the bending sensor s5 and the turning sensor The detection signals of s6 and s7 are read to determine whether or not the document P is bound. The first document P1 placed on the document table 24 is fed out by the pickup roller 26. Only when the document P is supplied to the document transport path Rt1 by the paper feed roller pair m1, it is determined whether or not the document P is bound. , Pj can be assumed not to be bound and not to determine whether the document P1 is bound.

  Further, in the present embodiment, the transport speed of the document P in the document transport path Rt1 is defined by the specifications of the document transport motor M1 (FIG. 1), but it is assumed that the document P is bound. Assuming that the document P is transported at a low speed, the document P can be prevented from being damaged when the document P is bent or turned up.

  In the present embodiment, the automatic document feeder 18 as a medium feeder provided in the image reading device 10 such as a scanner, a copier, a facsimile, and a multifunction machine has been described. The present invention can be applied to a medium transport device that transports a sheet, which is disposed in an image forming apparatus such as a printer that forms an image on a sheet.

  It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

18 Automatic Document Conveying Unit 24 Document Placement Table m1 Paper Feed Roller P, P1, P2, Pj Document Pr3 Document State Judgment Processing Unit Rt1 Document Conveying Path s5 Bending Sensors s6, s7 Flip Sensor

Claims (12)

(A) a medium mounting portion for mounting a medium;
(B) a medium supply unit that supplies the medium to a medium transport path;
(C) a detection unit that detects a transport abnormality occurring in the medium as the medium is supplied to the medium transport path by the medium supply unit and generates a detection signal;
(D) a medium transport device, comprising: a medium state determination processing unit that receives a detection signal from the detection unit and determines whether the medium is bound by a binding device.   The medium conveyance device according to claim 1, wherein the detection unit detects a conveyance abnormality by detecting a deformation of the medium caused by the supply of the medium to the medium conveyance path by the medium supply unit.   The medium conveyance device according to claim 2, wherein the detection unit detects a conveyance abnormality by detecting a bend generated in the medium when the medium supply unit supplies the medium to the medium conveyance path. (A) a swinging member is swingably disposed above the medium mounting portion,
(B) The detecting section is arranged to face the swinging member, and detects the bending of the medium by detecting the rotation of the swinging member that is rotated by contacting the medium. A medium transport device according to claim 1.   The medium conveyance device according to claim 2, wherein the detection unit detects a conveyance abnormality by detecting a curl generated in the medium as the medium supply unit supplies the medium to the medium conveyance path. (A) a regulating member for regulating the movement of the medium is formed in the medium placing portion;
6. The medium transport device according to claim 5, wherein the detection unit is disposed on the regulating member, and detects a turn of the medium as the medium is regulated by the regulating member. 7.   The medium transport device according to claim 6, wherein the restricting members are disposed so as to face each other at both edges of the medium placement unit.   The medium conveyance processing unit according to claim 1, further comprising: a medium conveyance processing unit that stops conveyance of the medium along the medium conveyance path when the medium state determination processing unit determines that the medium is bound. Media transport device.   9. The notification processing unit according to claim 1, further comprising: a notification processing unit that notifies an operator that the medium is bound when the medium state determination processing unit determines that the medium is bound. 9. Media transport device. (A) the medium supply unit includes a separation member for separating the medium,
The medium transport device according to claim 1, wherein (b) the detection unit is disposed upstream of the separation member in the medium transport path.   The medium conveyance device according to claim 10, wherein a double feed sensor is provided downstream of the medium supply unit in the medium conveyance path. (A) the medium transport device according to any one of claims 1 to 11,
(B) a reading unit that reads an image on a medium;
(C) an image reading device comprising: an image reading processing unit that stops reading an image when the medium state determination processing unit determines that the medium is bound.

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