JP2019029794A - Sheet transfer device, and image reading device - Google Patents

Abstract

To provide a sheet transfer device in which multiple sensors for detecting abnormal feeding can be mounted with a simple configuration.SOLUTION: A sheet transfer device has a separation feeding section for feeding sheets while separating one by one, a transfer section for transferring the sheets, separated in the separation feeding section, along a transport path, and a sheet detector placed at a sheet feeding direction downstream side of the separation feeding section, and detecting the sheet. The sheet detector has a double feed detection sensor for detecting double feed of the sheet, and a movement detection sensor for detecting movement of the sheet based on a movement amount or a direction of movement of a feature point included in a sheet image obtained by photographing the sheet passing through the transport path. A control board for controlling the sheet detector has a first board mounting a supersonic wave transmission section, and a second board mounting a supersonic wave reception section, and the movement detection sensor is energized from the first or second board and driven.SELECTED DRAWING: Figure 22

Description

  The present invention relates to a sheet conveying apparatus incorporated in, for example, a document scanner, a facsimile, a printer, a copying machine, and the like, and an image reading apparatus including the sheet conveying apparatus.

  The conventional sheet conveying apparatus includes, for example, a feeding roller, and a brake unit that applies pressure to the feeding roller and causes a predetermined conveying load to act on a medium that has entered between the feeding roller. In addition, there is known a medium supply device that feeds the medium while separating the medium one by one between the brake means (see Patent Document 1).

JP, 2014-181109, A

  In the medium conveying apparatus as described in Patent Document 1 described above, the medium is repeatedly wound at the nip formed between the feeding roller and the brake means, but two or more sheets overlap without being successfully wound. In some cases, abnormal feeding such as double feeding to be fed and skew feeding in which the medium is fed obliquely is generated.

  Therefore, in the conventional apparatus, as an abnormal feeding detection sensor downstream of the nip portion in the feeding direction, for example, a skew detection sensor configured by combining a plurality of optical sensors, a double feed detection sensor, or the like is used. Since they are arranged separately, the wiring of the sensor may be complicated.

  The present invention provides a sheet conveying apparatus in which a plurality of sensors for detecting abnormal feeding can be mounted with a simple configuration.

The present invention includes a separation feeding unit that separates and feeds sheets one by one,
A transport unit that transports a sheet separated by the separation feeding unit along a transport path;
A sheet detection unit that is disposed downstream of the separation feeding unit in the sheet feeding direction, and detects a sheet,
The sheet detection unit includes a double feed detection sensor that detects double feed of a sheet, and a movement amount or a movement direction of a feature point included in a sheet image obtained by photographing a sheet passing through the conveyance path. A movement detection sensor for detecting movement;
The double feed detection sensor has an ultrasonic transmission unit and an ultrasonic reception unit that are arranged to face each other with the conveyance path interposed therebetween,
The control board for controlling the sheet detection unit includes a first board on which the ultrasonic wave transmission unit is mounted, and a second board on which the ultrasonic wave reception unit is mounted,
The movement detection sensor is driven by energization from the first substrate or the second substrate.

  According to the present invention, it is possible to provide a sheet conveying apparatus in which a plurality of sensors for detecting abnormal feeding are mounted with a simple configuration.

FIG. 2 is a schematic cross-sectional view (conveyance state) of the document feeder according to the first embodiment. 1 is a schematic sectional view of a document feeder according to a first embodiment (standby state). FIG. 3 is a structural diagram of drive transmission of the document feeder according to the first embodiment. FIG. 3 is an enlarged view of a main part of a feeding unit of the document feeding device according to the first embodiment. FIG. 3 is a schematic diagram of a feeding / conveying unit of the document feeding device according to the first embodiment. The block diagram of the control unit which concerns on 1st Embodiment. 6 is a flowchart showing the operation of the document feeder according to the first embodiment. FIG. 3 is a perspective view of a feeding unit according to the first embodiment. Sectional drawing of the feeding part which concerns on 1st Embodiment. Sectional drawing of another feeding part. Sectional drawing of the feeding part which concerns on 1st Embodiment. The other sectional view of the feeding part concerning a 1st embodiment. The other sectional view of the feeding part concerning a 1st embodiment. Sectional drawing of the conventional feeding part. Sectional drawing of the feeding part which concerns on 1st Embodiment. The front view of the feeding part which concerns on 1st Embodiment (The figure seen in the feeding direction from the mounting base). The front view of the feeding part which concerns on 1st Embodiment (The figure seen in the feeding direction from the mounting base). The front view of the feeding part which concerns on 1st Embodiment (The figure seen in the feeding direction from the mounting base). The front view of the feeding part which concerns on 1st Embodiment (The figure seen in the feeding direction from the mounting base). Sectional drawing of the feeding part which concerns on 1st Embodiment. The board | substrate block diagram which concerns on 1st Embodiment. FIG. 3 is a schematic diagram of a substrate arrangement and wiring paths according to the first embodiment. The board | substrate block diagram which concerns on 2nd Embodiment. FIG. 6 is a layout diagram of a movement detection sensor according to a second embodiment. FIG. 10 is a schematic diagram of a feeding / conveying unit according to a third embodiment. FIG. 10 is a schematic diagram of a feeding / conveying unit according to a third embodiment. Schematic of the feeding and conveying unit according to the fourth embodiment. FIG. 10 is a structural diagram of drive transmission of a document feeder according to another embodiment. FIG. 10 is a structural diagram of drive transmission of a document feeder according to another embodiment. The perspective view which shows schematic structure of the feed roller which concerns on other embodiment. FIG. 10 is a structural diagram of drive transmission of a document feeder according to another embodiment. The principal part expanded sectional view of the original document feeding apparatus which concerns on other embodiment. The principal part expanded sectional view of the original document feeding apparatus which concerns on other embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
A first embodiment will be described with reference to FIGS. FIG. 1 is a schematic view of a sheet conveying apparatus A according to an embodiment of the present invention.

<Device configuration>
The sheet conveying apparatus A is an apparatus having an original conveying system such as an image reading apparatus (scanner or the like) that reads an image of an original, a printing apparatus (printer or the like) that performs printing on an original, or a combination machine that combines these. The present embodiment is described as an example applied to an image reading apparatus.

  In the sheet conveying apparatus A of the present embodiment, one or a plurality of originals S stacked on a mounting table 1 (stacking section) provided at the upper end on the back side of the apparatus main body A1 are placed on a horizontal plane with respect to the apparatus one by one. This is an apparatus that reads the image by transporting it on a path (conveyance path) RT inclined with respect to the (installation surface of the apparatus main body A1), and discharges it to the discharge tray 2 provided at the lower end on the front side of the apparatus main body A. .

  The apparatus main body A1 includes a first casing (lower unit) U1 having an installation surface, and a second casing (upper unit) U2 rotatably connected to the first casing via a hinge or the like. Consists of. In the present embodiment, the route RT along which the document S is conveyed is formed by a gap between the inclined surface on the upper side in the vertical direction of the first housing U1 and the inclined surface on the lower side in the vertical direction of the second housing U2. ing.

  The document S conveyed along the path RT of the apparatus main body A1 is, for example, a sheet of OA paper, a check, a check, a business card, a card, and the like, and even a thick sheet is a thin sheet. There may be. Examples of the cards include an insurance card, a driver's license, and a credit card.

<Feeding department>
As shown in FIG. 1, a first transport unit 10 is provided as a feeding mechanism that feeds a document S along a path RT of the apparatus main body A1. In the case of this embodiment, the first transport unit 10 includes a feeding roller 110 and a separation roller 12 disposed to face the feeding roller 110, and the document S disposed on the stacking surface side on the mounting table 1. Convey one by one sequentially in the feeding direction D1.

  Note that FIG. 1 shows the conveyance state, and FIG. 2 shows the standby state. 3 shows the drive transmission structure of the entire apparatus, FIG. 4 shows an enlarged view of the main part of the feeding unit, and FIG. 5 shows an enlarged view of the main part of the feeding and conveying part. In the present embodiment, the feeding direction D <b> 1 is provided at a predetermined angle with respect to the placement surface of the sheet conveying apparatus A, and the feeding direction D <b> 1 is fed by the weight of the document S placed on the placement table 1. A document S is supplied to the mechanism.

  On the upper end portion side of the first housing U1, a roller mounting portion a1 that is a concave portion for mounting the feeding roller 110 so as to come into contact with the document S on the mounting surface side of the mounting table 1 is provided. ing. In the present embodiment, a cover member a3 covering the periphery of the feeding roller 110 mounted in the roller mounting portion a1 is provided at the end of the roller mounting portion a1 so as to be freely opened and closed. When the cover member a3 is in the open state, the feeding roller 110 is detachable from the roller mounting portion a1.

  Further, as shown in FIG. 4, the feeding roller 110 includes two feeding roller portions (first roller portion and second roller portion) 11 formed of, for example, a rubber material or the like individually on the wheel portion 111. The wheel portion 111 is individually supported by a feed roller shaft (rotary shaft) 11b via a one-way clutch 11a. That is, the one-way clutch 11a of the present embodiment is a first one-way clutch unit and a second one-way clutch unit that are respectively provided independently of the plurality of feeding roller units 11 that are separately provided on the left and right sides.

  Further, as shown in FIG. 4, the feeding roller shaft 11b of the feeding roller 110 has shaft end portions on both sides held by a bearing portion a2 provided in the roller mounting portion a1, and a cover member from above. By closing a3, the bearing structure of the feeding roller shaft 11b is formed between the cover member a3 and the bearing portion a2 of the roller mounting portion a1, and the space between the bearing portion a2 in the roller mounting portion a1 and the cover member a3 is formed. Thus, both ends of the feed roller shaft 11b are rotatably held. That is, the feeding roller 110 can be easily attached and detached by opening and closing the cover member a3.

  Further, the feeding roller shaft 11 b included in the feeding roller 110 is provided with a feeding gear portion 112 in a gap in the axial direction of each feeding roller portion 11. The feed gear portion 112 is gear-connected to the drive gear portion 101 that transmits the driving force of the motor 3 (drive motor) installed in the apparatus main body A1. The feeding gear portion 112 has a structure in which the upper part on the separation roller 12 side is covered by the cover member a3 when the cover member a3 is closed. Thereby, it is possible to protect the paper dust from adhering to the feeding gear portion 112 by the cover member a3.

  Thus, the feeding gear portion 112 protected by the cover member a3 is provided with a gear diameter smaller than the diameter of each feeding roller portion 11. For this reason, the drive gear portion 101 partially overlaps each feed roller portion 11 when viewed in the axial direction of the feed roller shaft 11b, and the gear connection portion with the feed gear portion 112 is each feed roller when viewed in the axial direction. It is provided so as to overlap the part 11. Thereby, the outer diameter of the feeding gear portion 112 can be set small, the accommodation property of the feeding roller 110 can be improved, and physical interference with the cover member a3 can also be prevented.

  Further, the drive gear portion 101 connected to the feeding gear portion 112 is provided on one end side of the drive gear shaft 102, and the other end side of the drive gear shaft 102 is a clutch constituted by an electromagnetic clutch or the like. A unit 103 is provided. The clutch unit 103 is connected between a drive transmission mechanism (gear train) X that transmits a driving force from the motor 3 with a pulley and a drive gear shaft 102. That is, the drive gear shaft 102 and the drive transmission mechanism X are drivingly connected by the clutch portion 103 included in the drive gear shaft 102. Further, the drive transmission mechanism X to the feed roller 110 is connected to the drive transmission mechanism of the separation roller 12. That is, the motor 3 serves as a driving source for the separation roller 12 and the feeding roller 110.

  Here, when the clutch portion 103 provided on the drive gear shaft 102 is OFF, the reverse rotation drive of the motor 3 (drive for returning the document to the mounting table 1 side) is not transmitted to the drive gear shaft 102, and the clutch portion 103. Is a switching means for transmitting only the forward rotation drive (drive in the direction of separating and feeding the document) of the motor 3 to the drive gear shaft 102.

  When the clutch portion 103 is turned off, drive transmission is performed only to the separation roller 12, and at this time, the feeding roller 110 is driven to rotate by the separation roller 12. Thereby, when it is detected by the double feed detection sensor 40 described later that the original has been double-fed, the feeding operation is temporarily stopped and the motor 3 is driven to return the double-fed original to the mounting table 1 side. Can be performed appropriately. Note that the clutch unit 103 may not be provided when such a double feed retry function is not installed.

  As described above, in this embodiment, when the motor 3 is driven and the driving force is transmitted from the driving gear unit 101 to the feeding gear unit 112, the feeding roller shaft 11b is fed in the feeding direction together with the feeding gear unit 112. It rotates in the direction of the solid arrow D2 in FIG. At this time, the one-way clutch 11a meshes with the feeding roller shaft 11b, whereby the feeding roller unit 11 rotates in the feeding direction together with the wheel unit 111.

  Here, the conveyance speed of the feeding roller 110 is set to a speed slower than the conveyance speed of the conveyance roller 21 described later. Therefore, when the fed document S reaches the transport roller 21 and the transport speed of the document S is increased, the one-way clutch 11a and the feed roller shaft 11b are disengaged, and the feed roller 110 is moved along with the transport document S. And rotates faster than the rotation speed by the drive transmission from the motor 3.

  That is, the transported document S that has reached the transport roller 21 receives a transport force from the transport roller 21 that is set to have a large speed difference from the feed roller 110, and is thus brought into contact with the feed roller 110 and the feed roller 110. Then, it is pulled out from between the separation roller 12.

  At this time, in the present embodiment, as described above, since the one-way clutch 11a is individually provided for the left and right feeding roller portions 11, the conveyed document S that has reached the conveying roller 21 is skewed. Even if the sheet is pulled out from between the feeding roller 110 and the separation roller 12, the operation of the individual one-way clutch 11a suppresses the skew chain of the succeeding document S (hereinafter referred to as “the skew chain suppression effect”). .

  Here, as described above, the feeding roller 110 according to the present embodiment has the feeding gear portion 112 disposed in the gap between the feeding roller portions 11 in the axial direction of the feeding roller shaft 11b. The driving force of the motor 3 is stably transmitted to the roller 110.

  That is, the feeding roller 110 receives an urging force from the separation roller 12, and drive transmission to the feeding roller shaft 11 b is performed between the feeding roller portions 11 with respect to the urging force. Therefore, drive transmission is performed in a balanced manner at substantially equal positions in the left and right feeding roller portions 11.

  Further, with respect to the feeding roller 110 of the present embodiment, the separation roller 12 is in contact with each roller end of the feeding roller unit 11 on the feeding gear unit 112 side.

  That is, the separation roller 12 is evenly biased by the spring or the like with respect to each feeding roller portion 11 of the feeding roller 110. However, in the configuration of the present embodiment, the feeding gear among the feeding roller portions 11. The gear connection between the feed gear portion 112 and the drive gear portion 101 is further stabilized by adopting a configuration in which the roller ends on the portion 112 side are pressed against each other. Thereby, the power transmission to the feeding roller 110 can be performed more stably, and the contact pressure state with the separation roller 12 can maintain a good balance on the left and right.

  In the present embodiment, as described above, the separation roller 12 is in contact with the end of each roller on the feeding gear portion 112 side (the side facing each other) in each feeding roller portion 11. The roller end on the side opposite to the feeding gear portion 112 may be in contact with the separation roller 12 or may be in contact with the separation roller 12 at the central portion of each feeding roller portion 11 in the axial direction. May be. In any case, it is preferable that the separation roller 12 is contacted equally to the left and right with respect to each feeding roller portion 11.

  As described above, the feeding roller unit 11 according to the present embodiment receives the urging force of the separation roller 12 and is brought into contact with the separation roller 12 in a balanced manner on the left and right. That is, the posture of the feeding roller 110 with respect to the separation roller 12 is stabilized. Accordingly, the left and right nip forces are equally applied to the document S, so that the skew of the document S can be prevented in advance, and a stable feeding operation can be performed on various types of documents. . Even if the preceding document S is skewed, the individual operation of the above-described one-way clutch 11a can be stably performed on the succeeding document S, so that the effect of suppressing skew chaining can be further enhanced.

  Further, in the present embodiment, the feeding gear portion 112 is provided with a cylindrical portion that holds the feeding roller shaft 11b, and the cylindrical portion 112a extends so as to protrude on both sides in the axial direction of the feeding roller shaft 11b. Has been. As a result, the wheel portions 111 or the one-way clutch 11a holding the respective feed roller portions 11 and the end portions (first and second contact portions) of the respective cylindrical portions 112a come into contact with each other, so that each feed roller portion 11 is brought into contact. Can be kept constant. However, the cylindrical portion 112a of the feeding gear portion 112 and the wheel portion 111 or the one-way clutch 11a may not always be in contact with each other, and the wheel portion 111 can move slightly in the axial direction with respect to the feeding roller shaft 11b. The wheel portion 111 may be configured to be able to come into contact with the one-way clutch 11a when it moves to the feeding gear portion 112 side. In any case, the interval between the feeding roller portions 11 can be kept constant by the cylindrical portion 112a of the feeding gear portion 112.

  That is, the feeding gear unit 112 of the present embodiment serves to regulate the interval between the feeding roller units 11. Here, the wheel portion 111 and the end portion of each cylindrical portion 112a of the feeding gear portion 112 have been described as being in contact with each other, but the same effect can be obtained even if they are in contact with the side surface portion of the one-way clutch 11a. It is done.

  Further, as in the present embodiment, the one-way clutch 11a is substantially covered with each cylindrical portion 112a of the feeding gear portion 112, thereby preventing paper dust and the like from entering the gap of the one-way clutch 11a. The effect can also be expected.

  Each of the feeding roller 110 and a separation roller 12 described later is a single unit and can be attached to and detached from the apparatus. For this reason, maintenance is easy, and the unit of the feed roller 110 can be replaced when the roller surface is worn.

<Separation part>
The separation roller 12 disposed to face the feeding roller 110 described above is a roller for separating the document S one by one, and is in pressure contact with the feeding roller 110 with a constant pressure. In order to ensure this pressure contact state, the separation roller 12 is supported by a separation rocking member 121 as shown in FIG. The separation rocking member 121 is supported so as to be rotatable about a shaft portion 121a, and an urging force is applied by a compression spring 122 so that the separation roller 12 is pressed against the feeding roller 110.

  As shown in FIG. 1, the separation roller 12 is driven to rotate in the direction of the solid line arrow D <b> 3 as a driving force is transmitted from the motor 3 through the torque limiter 12 a. Since the transmission of the driving force is regulated by the torque limiter 12a, the separation roller 12 rotates in a direction (a broken line arrow D4 direction) that rotates with the feeding roller 110 when it is in contact with the feeding roller 110. As a result, as shown in FIG. 5, when a plurality of documents S are conveyed to the nip portion (pressure contact portion) N between the feeding roller 110 and the separation roller 12, two or more of them are left behind. The document S is stopped so as not to be conveyed downstream.

  Such a portion where the feeding roller 110 and the separation roller 12 are brought into contact with each other and exert a separating action on the original, that is, a portion where the original is scooped functions as at least a separation feeding portion. For example, when the feeding roller 110 is configured by two feeding roller portions 11 as in the present embodiment, the feeding portion is sandwiched between the feeding roller portions 11 with respect to the nip portion N. It also has a meaning as a separating and feeding unit including the part.

  In the present embodiment, the structure using the separation roller 12 has been described. However, the present invention is not limited to the form of the roller, and the document S is loaded in the direction opposite to the feeding direction, such as a separation pad. The same applies to the case of using the separation member, and the separation member may have any form.

<Document detection structure of feeding unit>
In order to detect the presence or absence of the document S on the mounting table 1, a document detection sensor 90 is provided upstream of the feeding roller 110 as shown in FIG. The document detection sensor 90 is a lever-type sensor that is provided so as to hang down from the upper side in the vertical direction under its own weight. As another example, optical sensors such as medium detection sensors 50 and 60 described later may be used.

  Here, in the present embodiment, the document detection sensor 90 is a sensor that detects the presence or absence of a document immediately before the nip portion formed by the separation roller 12 and the feed roller unit 11 in the feed direction. For this reason, the document detection sensor 90 is preferably disposed between the left and right feeding roller portions 11 that are close to the nip portion. In this case, the document detection sensor 90 feeds the cover member a3 in between. The roller 110 is provided at a portion facing the feeding gear portion 112.

  For example, it is preferable to prevent physical interference with the document detection sensor 90 (and the cover member a3) when setting the outer diameter of the feeding gear portion 112 in transmitting the driving force. In some cases, it may be desirable to bring the original detection position closer to the nip portion in order to improve accuracy.

  Therefore, in order to achieve both of them, the feeding roller unit is configured such that the leading end of the document detection sensor 90 overlaps each feeding roller unit 11 and the feeding gear unit 112 in the axial direction of the feeding roller unit 11. 11 and the feeding gear portion 112 are preferably extended in a fang shape.

  Even in this case, it is preferable that the cover member a3 is interposed between the document detection sensor 90 and the feeding gear portion 112. In that case, the cover member a3 has a central portion protruding toward the separation roller 12 in order to prevent interference with the feeding gear portion 112, and both sides of the central portion are fed in order to prevent interference with the document detection sensor 90. It is preferable that the shape protrudes toward the roller shaft 11b.

  Thereby, the cover member a3 covers the periphery of the feed roller 110 including the feed gear portion 112, and prevents paper dust and the like from adhering to the drive system, and the drive portion of such a feed roller 110, On the surface of the cover member a3, it is possible to structurally separate the original detection portion that detects the presence or absence of the original by the original detection sensor 90.

  It is preferable that the fang-shaped tip portions of the document detection sensor 90 are connected to each other in order to ensure the rigidity of the document detection sensor 90. In this case, the connection portion is connected to the feeding gear unit 112. It is preferable to form in a shape that bypasses the downstream side in the feeding direction. Thereby, while ensuring the rigidity of the document detection sensor 90, the document detection position can be brought close to the nip portion, and the design freedom of the feeding gear unit 112 can be further increased.

  By adopting the lever-type document detection sensor 90 as in the present embodiment, a space for providing the feeding gear portion 112 in the feeding roller 110 is secured, and in addition to highly accurate document detection, the left and right contact is even. Good separation and feeding can be performed in a pressure state.

<Pick arm / document stopper>
As shown in FIG. 1, the sheet conveying apparatus A includes a pick roller 131 that presses the document S against the feeding roller 110 on the upstream side of a nip (hereinafter referred to as a feeding nip) where the feeding roller 110 and the separation roller 12 are in contact, A pick arm 13 that pivotally supports the roller 131 is provided. The pick roller 131 assists the feeding of the document S by increasing the conveying force of the document S by pressing the document S against the feeding roller 110.

  The pick arm 13 is supported by the apparatus A so that the shaft portion 13a of the pick arm 13 is rotatable, and is urged by a spring (not shown) in a direction in which the pick roller 131 is pressed against the feeding roller 110. The pick arm 13 is described below in a pressure contact position where the pick roller 131 shown in FIG. 1 presses the document S against the feeding roller 110 and a retreat position where the pick roller 131 shown in FIG. 2 is retracted from the feeding roller 110. It can be moved by the driving force of the motor 4.

  As another configuration for assisting the feeding of the feeding roller 110, there is a configuration in which another feeding roller is provided upstream of the feeding roller 110. However, the configuration of FIG. Cost reduction can be realized.

  The sheet conveying apparatus A includes a document stopper 14 as shown in FIG. In the state shown in FIG. 2, the document stopper 14 has a role of blocking the stacked document bundle by projecting its tip toward the conveyance path.

  The document stopper 14 is configured such that the shaft portion 14a of the document stopper 14 is rotatably supported by the apparatus A, and an opening position that opens the conveyance path so that the document S shown in FIG. 1 can be fed, and the feeding shown in FIG. It is possible to move to a closing position where the conveyance path is closed so that the document bundle does not enter the nip. FIG. 2 shows a standby state of the sheet conveying apparatus A. In this state, the document bundle can be set on the mounting table 1 by abutting the leading end of the document bundle against the document stopper 14.

  The motor 4 is connected via a pulley P and a belt 4a on one end side of the conveyance roller shaft 21a that holds the conveyance roller 21 and the conveyance roller shaft 31a that holds the conveyance roller 31.

  In other words, the motor 4 is a drive source that drives the transport rollers 21 and 31, and is provided as a motor different from the motor 3 that drives the feeding roller described above. As a result, if the motors 3 and 4 are individually controlled, highly accurate feeding and conveying control can be realized by performing separate control for feeding driving and conveying driving.

  The pick arm 13 and the document stopper 14 are driven by the motor 4 that drives the transport rollers 21 and 31 described above via a drive transmission mechanism Y (see FIG. 3). When the motor 4 drives the predetermined number of pulses in the forward direction, the pick arm 13 moves to the pressure contact position and the document stopper 14 moves to the opening position, and when the motor 4 drives the predetermined number of pulses in the reverse direction, the pick arm 13 Moves to the retracted position, and the document stopper 14 moves to the closing position. Here, the positive direction is a direction in which conveyance rollers 21 and 31 described later are rotated so as to convey the document S in the feeding direction D1 in FIG.

<Conveying structure>
As shown in FIG. 1, the second transport unit 20 as a transport mechanism on the downstream side in the feeding direction of the first transport unit 10 includes a transport roller 21 and a driven roller 22 driven by the transport roller 21. The original S conveyed from the first conveyance unit 10 is conveyed downstream thereof. A driving force is transmitted from the motor 4 to the transport roller 21 and is driven to rotate in the direction of the solid arrow in the figure. The driven roller 22 is brought into pressure contact with the conveying roller 21 at a constant pressure, and rotates with the conveying roller 21.

  The third transport unit 30 on the downstream side in the feeding direction from the second transport unit 20 includes a transport roller 31 and a driven roller 32 that is driven by the transport roller 31 and is transported from the second transport unit 20. The received original S is conveyed to the discharge tray 2. That is, the third transport unit 30 functions as a discharge mechanism. A driving force is transmitted from the motor 4 to the transport roller 31 and is driven to rotate in the direction of the solid arrow in the figure. The driven roller 32 is brought into pressure contact with the conveying roller 31 at a constant pressure, and is taken by the conveying roller 31.

<Double feed detection>
As shown in FIGS. 1 and 2, the double feed detection sensor 40 disposed between the first transport unit 10 and the second transport unit 20 causes the documents S such as paper to be in close contact with each other due to static electricity or the like. This is an example of a sheet detection sensor (a sensor for detecting the behavior and state of the document S) for detecting this when it has passed through the conveying unit 10 (that is, in the case of a double feeding state in which it is conveyed while being overlapped).

  Various sensors can be used as the double feed detection sensor 40. For example, in the case of the present embodiment, the ultrasonic sensor 41 is an ultrasonic sensor, and an ultrasonic transmission unit 41 arranged so as to sandwich the route RT and its reception. The unit 42 is configured to perform double feeding based on the principle that the attenuation amount of the ultrasonic wave passing through the original S is different between when the original S such as paper is being fed one by one and when being fed one by one. It is a sensor to detect.

  Here, the ultrasonic wave transmitting unit 41 is provided on the first housing U1 side of the apparatus main body A1, and the ultrasonic wave receiving unit 42 is opposed to the ultrasonic wave transmitting unit 41 in the second housing U2. On the side. Specifically, the ultrasonic wave transmission unit 41 and the reception unit 42 are mounted on different substrates 101 and 102, respectively, the substrate 101 is incorporated into the first housing U1, and the substrate 102 is incorporated into the second housing U1. It is. If the substrate 102 on which the receiving unit 42 is mounted has a function of driving and detecting ultrasonic waves, a minute analog signal received by the ultrasonic receiving unit 42 is amplified, and detection control is performed in the shortest time. Can be input to a device (for example, a microcomputer equipped with A / D), which leads to improvement in accuracy of double feed detection.

  Such a double feed detection sensor 40 forms a double feed detection region 40a in a route RT at a portion sandwiched between the ultrasonic wave transmission unit 41 and the reception unit 42 (see FIG. 5). In this double feed detection area 40a, since sonic vibration is generated, paper dust may be scattered to other parts by sonic vibration to prevent the residue even if paper powder is mixed therewith. May affect the attenuation amount of the ultrasonic wave and may deteriorate the accuracy of double feed detection.

In the present embodiment, as shown in FIG. 5, the downstream of the original separating / feeding section (specifically, the portion constituted by the feeding roller 110 and the separating roller 12) extends downstream in the original feeding direction. Of the region Z, the downstream region Z ₂ excluding the downstream region (paper dust region Z ₁ ) extending downstream from the nip portion between the feeding roller 110 and the separation roller 12 in the document feeding direction. It is preferable to provide a double feed detection area 40a (detection area).

For example, in this embodiment, opposite the receiver 42 and the transmitter unit 41 of the ultrasonic waves from the gap of the feeding roller 11 of the feeding roller 110 to the downstream region Z ₂ extending in the feeding direction downstream side of the document The double feed detection area 40a is set. Thus, the double feed detection region 40a is to be set at a position deviated from the paper dust region Z _1, it is possible to reduce the influence of paper dust, it is possible to improve the accuracy of the double feed detection.

In the present embodiment has been described in example in which the double feed detection sensor 40 to disengage the paper dust region Z _1, for example, since the transmitting portion 41 are arranged in the first housing U1 side, paper dust it is also possible to arrange the double feed detection sensor 40 to the region Z _1. Even when temporarily providing the transmitter section 41 to the second housing U2 side, because it can reduce the effects of paper dust by ultrasonic vibration, it is also possible to provide the receiver 42 to the paper dust in the region Z _1.

  Here, the arrangement of the double feed detection sensor 40 will be described in more detail. For example, in the present embodiment, as shown in FIG. 22, the substrate 101 on which the ultrasonic wave transmission unit 41 is mounted has a mounting surface with respect to the first housing U1 facing the apparatus installation surface in a direction parallel to the transport path RT. Tilted and assembled into the first housing U1. Similarly to the substrate 101 on which the transmission unit 41 is mounted, the substrate 102 on which the receiving unit 42 is mounted has a direction in which the mounting surface with respect to the second housing U2 is parallel to the transport path RT (or in a direction parallel to the substrate 101). It is assembled in the second housing U2.

  The boards 101 and 102 on which the ultrasonic transmission unit 41 and the reception unit 42 are separately mounted are connected to the main board B on which external communication and power supply are performed in the first housing U1, and are connected to the main board B. Between them, communication (control command, etc.) and energization (power supply) are possible through the cable C.

  The main board B and the board 102 of the receiving unit 42 in the second casing are connected through a cable C. The cable C rotates the first casing U1 and the second casing U2. Wiring is preferably performed via the hinge portion H that is freely connected. Of course, each of the first casing U1 and the second casing U2 is provided with a connection portion that establishes an electrical contact in accordance with the opening and closing of the first casing U1 and the second casing U2, and such You may make it supply with electricity to the board | substrate 102 through a connection part.

<Movement detection unit>
The movement detection sensor 45 includes, for example, a light source that emits light toward the conveyance path, and an imaging unit that receives and captures (photographs) light that is emitted from the light source and reflected from the document, although not shown. The movement detection sensor 45 of the present embodiment irradiates a document with light from a light source, acquires an image obtained by receiving reflected light from the document with an imaging unit, and based on movement of feature points included in the image. The sensor detects the amount or direction of movement of the document, and is an example of a sheet detection sensor (sheet detection unit).

  That is, the movement detection sensor 45 of the present embodiment is a tracking sensor that tracks (tracks) the movement and change of feature points in a sheet image of a document shot in one detection area. It is used as a sensor for detecting the oblique movement (skew).

  As shown in FIG. 5, the movement detection area 45a of the movement detection sensor 45 is relatively smaller than the double feed detection area 40a of the double feed detection sensor 40, for example, from a 1 mm square area. Therefore, it is more susceptible to paper dust than the double feed detection sensor 40. In the present embodiment, the movement detection sensor 45 and the double feed detection sensor 40 constitute a sheet detection unit, but other sensors may be additionally arranged at the same position.

  In this embodiment, since the movement detection sensor 45 is provided on the second housing U2 side, the structure is such that paper dust does not easily adhere to the movement detection sensor 45. Therefore, the movement detection sensor 45 can be disposed close to the feeding unit (nip unit) side. Since the posture of the document leading edge that has passed through the nip portion is relatively stable, tracking accuracy can be improved by placing the movement detection sensor 45 close to the nip portion.

  In addition, as shown in FIG. 22, the movement detection sensor 45 in the present embodiment is disposed on the substrate 102 on which the ultrasonic wave receiver 42 disposed on the second housing U2 side is mounted. In addition, the main board B arranged on the first housing U1 side is connected to the connector provided on the board 102 using the cable C to be energized, so that power supply and transmission / reception of control commands can be performed. ing.

  Therefore, power can be supplied from the main board B to the movement detection sensor 45 (light source and imaging unit) through at least the board 102 of the receiving unit 42. Thereby, the cable arrangement for the independent power supply from the main board B to the movement detection sensor 45 can be omitted, and the wiring structure can be simplified. In this embodiment, since the cable C is routed through the hinge portion, there is an advantage that the wiring space of the hinge portion can be reduced.

  In addition, since the movement detection sensor 45 is arranged on the same substrate 101 as the ultrasonic receiving unit 42 as in this embodiment, the sensor can be mounted with a smaller number of substrates, so that the structure of the entire apparatus can be simplified. Since the number of parts can be reduced, the cost can be reduced. Furthermore, by executing the control of the ultrasonic sensor and the control of the movement detection sensor with the same device, the control system can be unified, leading to cost reduction of the apparatus. In the present embodiment, the substrate 101 and the substrate 102 constitute a control board for controlling the sheet detection unit as described above, but the present invention is not necessarily limited to this structure.

In the above description, the configuration in which the movement detection sensor 45 is disposed on the second housing U2 side has been described. However, the present invention is not limited to this, and the ultrasonic transmission unit 41 disposed on the first housing U1 side. It may be provided by being directly mounted on or connected to the substrate. As described above, when the movement detection sensor 45 is arranged on the first housing U1 side to track the document moving along the route RT, paper dust generated due to separation during document feeding is accompanied by document transportation. since there is a region to move along a path RT Te, it is preferable to arrange such a paper dust region Z ₁ as much as possible avoided.

Therefore, the movement detection sensor 45 described above is provided on the downstream surface Z extending on the downstream side in the document feed direction with respect to the document separation / feed unit on one wall surface of the transport path RT on the side where the feed roller 110 is provided. it is preferably provided in correspondence with the downstream region Z ₂ except out paper powder region Z _1. Accordingly, the movement detection area (detection area) is to be set at a position deviated from the paper dust region Z _1, it is possible to reduce the influence of paper dust, it is possible to improve the accuracy of the movement detection.

  Further, in this case, as shown in FIG. 5, the movement detection sensor 45 is provided upstream of the conveyance path RT of the double feed detection sensor 40 in relation to the double feed detection sensor 40. Furthermore, since the distance between both sensors is long, a through hole is individually provided in the conveyance path, and the detection target of each sensor can be detected from this hole. Even if paper dust is mixed in the double feed detection area 40a of the double feed detection sensor 40 and the paper dust is scattered outside due to ultrasonic vibration, the movement detection sensor 45 is located upstream of the double feed detection sensor 40. By arranging it on the side, the influence on the movement detection sensor 45 can be prevented in advance.

<Registration sensor>
The medium detection sensor 50 disposed on the downstream side in the feeding direction with respect to the above-described multifeed detection sensor 40 is located upstream of the second transport unit 20 and upstream of the first transport unit 10. This is an example of a detection sensor (a sensor for detecting the behavior and state of the document S), and the position of the document S conveyed by the first conveyance unit 10, specifically, the end of the document S at the detection position of the medium detection sensor 50. It is detected whether the part has reached or passed. In the present embodiment, as shown in FIGS. 1, 2, and 5, the medium detection sensor 50 further includes the above-described double feed detection sensor 40 and the movement detection sensor 45 on the second conveyance unit 20 side. in is provided in the same downstream region Z _2.

  Various media detection sensors 50 can be used. In the case of the present embodiment, the medium detection sensor 50 is an optical sensor. The medium detection sensor 50 includes a light emitting unit 51 and a light receiving unit 52. The document S is detected based on the principle that (the amount of received light) changes. Such a medium detection sensor 50 may be mounted on, for example, the substrate 101 on which the ultrasonic wave transmission unit 41 is mounted, or may be mounted on another substrate. In the former case, together with the movement detection sensor 45, it is possible to reduce the number of substrates and simplify the connection wiring.

  In the case of this embodiment, when the leading edge of the document S is detected by the medium detection sensor 50, the medium detection is performed so that the document S has reached a position where the double feed detection sensor 40 can detect double feed. The sensor 50 is provided on the downstream side in the vicinity of the double feed detection sensor 40. The medium detection sensor 50 is not limited to the optical sensor described above. For example, a sensor (image sensor or the like) that can detect the edge of the document S may be used, or a lever-type sensor that protrudes in the path RT. But you can.

  A medium detection sensor 60 different from the medium detection sensor 50 is disposed on the upstream side of the image reading unit 70. This is an example of a downstream detection sensor disposed downstream of the second transport unit 20 and detects the position of the document S transported by the second transport unit 20.

  Various media detection sensors 60 can be used. In the case of the present embodiment, the medium detection sensor 60 is an optical sensor similar to the medium detection sensor 50, and includes a light emitting unit 61 and a light receiving unit 62, and reaches the document S. Alternatively, the document S is detected based on the principle that the received light intensity (received light amount) changes due to passage.

<CIS layout>
The image reading unit 70 on the downstream side of the medium detection sensor 60 is, for example, optically scanned, converted into an electric signal and read as image data, and internally includes a light source such as an LED, an image sensor, and a lens array. Etc. In the present embodiment, one image reading unit 70 is disposed on each side of the path RT, and is configured by a contact image sensor (CIS) that reads the front and back surfaces of the document S.

<Explanation of block diagram>
The control unit 80 will be described with reference to FIG. FIG. 6 is a block diagram of the control unit 80 of the sheet conveying apparatus A.

  The control unit 80 includes a CPU 81, a storage unit 82, an operation unit 83, a communication unit 84, and an interface unit 85. The CPU 81 controls the entire sheet conveying apparatus A by executing a program stored in the storage unit 82. The storage unit 82 includes, for example, a RAM, a ROM, and the like. The operation unit 83 includes, for example, a switch, a touch panel, and the like, and accepts an operation from the operator.

  The communication unit 84 is an interface that performs information communication with an external device. When a PC (personal computer) is assumed as the external device, examples of the communication unit 84 include a USB interface and a SCSI interface. In addition to such a wired communication interface, the communication unit 84 may be a wireless communication interface, and may include both wired communication and wireless communication interfaces.

  The interface unit 85 is an I / O interface that inputs and outputs data with the actuator 86 and the sensor 87. The actuator 86 includes the motor 3 and the motor 4. The sensor 87 includes a double feed detection sensor 40, a movement detection sensor 45, medium detection sensors 50 and 60, an image reading unit 70, a document detection sensor 90, and the like.

<Driving by receiving start instruction from PC>
A basic operation of the sheet conveying apparatus A will be described. For example, when receiving an image reading start instruction from an external personal computer to which the sheet conveying apparatus A is connected, the control unit 80 starts driving the first to third conveying units 10 to 30. The documents S stacked on the mounting table 1 are conveyed one by one from the document S located at the bottom. The image reading start instruction may be executed by pressing a start button provided in the sheet conveying apparatus A.

<Start reading according to the output of the registration sensor>
The control unit 80 starts reading an image of the document S conveyed by the second conveying unit 20 by the image reading units 70 and 70 at a timing based on the detection result of the medium detection sensor 60, and primarily reads the read image. Memorize and send to external PC sequentially. The document S from which the image has been read is discharged to the discharge tray 2 by the third transport unit 30, and the image reading process for the document S is completed.

<Operation flow of feeding / conveying>
Next, the operation flow of feeding / conveying will be described with reference to FIG.

  In step S01, the control unit 80 receives an image reading start instruction from, for example, an external personal computer to which the sheet conveying apparatus A is connected.

  In step S <b> 02, the control unit 80 determines the presence or absence of the document S on the table 1 by the document detection sensor 90.

  In step S03, when the control unit 80 determines that the document S is not present by the document detection sensor 90, a warning message indicating that the document S is not present is displayed on an external personal computer or the like, and the process is terminated without feeding / conveying.

  In step S04, when the control unit 80 determines that the document S is on the placement table 1 by the document detection sensor 90, the motor 4 is driven in the forward direction. At this time, the pick arm 13 is moved to the press contact position, and the document stopper 14 is moved to the opening position.

  In step S05, the control unit 80 drives the motor 3, rotates the feed roller 110 in the direction in which the document S is fed (forward direction), and feeds the document S.

  In step S06, it is detected that the leading edge of the conveyed document S has passed the medium detection sensor 50, and then in step S07, it is detected that the leading edge of the conveyed document S has passed the medium detection sensor 60.

  At this time, since the transport document S has reached the second transport unit 20 because the leading edge of the transport document S has passed through the medium detection sensor 60, the transport document S remains even if the first transport unit 10 is stopped. Since it is transported by the second transport unit 20, the control unit 80 stops the motor 3 in step S08.

  On the other hand, from the time when the leading edge of the document S reaches the medium detection sensor 60, image reading of the document S is started after a predetermined time for reaching the image reading unit 70.

  In step S09, it is detected that the trailing edge of the conveyed document S has passed through the medium detection sensor 60. After a predetermined time has elapsed from this time, the image reading of the document S is terminated. Thus, a series of reading operations for one document S is completed.

  In step S <b> 10, the control unit 80 determines the presence or absence of the document S on the table 1 by the document detection sensor 90. If it is determined that the document S is present, the process proceeds to step S5, where the document S is conveyed and the image is read.

  If the document detection sensor 90 determines in step S10 that there is no document S on the mounting table 1, the control unit 80 stops the motor 4 in step S11. At this time, the motor 4 is stopped after a lapse of a predetermined time so that the document that has passed through the medium detection sensor 60 is discharged by the third transport unit 30. When the motor 4 does not drive the third transport unit, the motor 4 may be stopped immediately.

  Thereafter, in step S12, the control unit 80 drives the motor 4 in the reverse direction by a predetermined number of pulses and then stops. At this time, the pick arm 13 is moved to the retracted position and the document stopper 14 is moved to the closing position to stop. This completes the feeding / conveying operation.

  With the above operation flow, the conveyance control for feeding the next document S is performed using the medium detection sensor 60 as a trigger. As a result, since a predetermined sheet interval is provided at the reading position of the image reading unit 70, the document S can be stably conveyed continuously.

<Separating rocking member>
As shown in FIG. 9, the separation rocking member 121 is provided on the side portion of the separation roller 12, and is supported by the rib portion 121b so as to be rockable. It has a limiting member 1211 and a spring 1212 that biases the limiting member 1211. The restricting member 1211 is an example of a movable member, and enters a space between the separation roller 12 and the front end side of the document as will be described later.

  As shown in FIG. 9, which is a side view of the separation rocking member 121, the rib portion 121 b has a surface 121 c that is substantially flush with the outer surface on the upstream side in the feeding direction with respect to the rotation center of the separation roller 12. When a heavy document bundle such as a document bundle having a large number of stacked sheets is fed, the upper document S in the stacked document bundle is pressed against the separation roller 12 by the leading edge of the document bundle hitting the surface 121c. 12 is prevented from collapsing, and the number of document bundles entering the feeding nip is limited to reduce feeding defects.

  The restricting member 1211 is provided so as to protrude toward the conveying path from the protruding portion 121d which is the leading end of the rib portion 121b protruding toward the conveying path, and to protrude upstream from the rib portion 121b in the feeding direction. The restricting member 1211 can rotate around the shaft portion 1211a, is urged by a spring 1212 in a direction protruding in the conveyance path (in the direction of arrow D5 in the figure), and the rotation stop portion 1211b abuts against the rib portion 121b.

  The restricting member 1211 is biased by a spring 1212 so as to be retracted (turned in the direction opposite to the arrow D5) when a heavy document bundle is set, and not retracted when a light document bundle is set. . A light original bundle is an original having a particularly thin paper thickness and a small original size, such as a bundle of slips.

For example, in the present embodiment, in the sheet conveying apparatus A having a maximum stacking number of 60 sheets, the conveying path is 40 degrees with respect to the installation surface of the sheet conveying apparatus A. In this case, the basis weight is 80 g / m. ² when 60 sheets of A4 size OA paper are set, the restricting member 1211 is pushed and retracted by the original bundle, and when 60 sheets of A6 size slip is set with a basis weight of 40 g / m ² , the limiting member 1211 is the original document. The load of the spring 1212 is set so that it does not retract even when pushed by the bundle.

  As described above, the urging force of the spring 1212 that urges the limiting member 1211 can set the specifications of the sheet conveying apparatus A and the extent of the original bundle, and is not necessarily unique. It is not decided.

  By providing such a restricting member 1211, it is possible to prevent a paper jam (paper jam) in particular. When the limiting member 1211 is not provided, as shown in FIG. 10, when a thin document bundle such as a slip is fed, a part of the document bundle enters the feeding nip, and between the feeding nip and the leading end of the document bundle. There may be a space K.

  At this time, while the document S1 is being fed, the document S2 to be fed next in the space K is taken and receives a force in the feeding direction (positive direction), and also receives a negative force from the separation roller 12. In this case, the leading edge of the document S2 may bend and the leading edge or jam of the document S2 may occur.

  On the other hand, in the present embodiment, by providing the above-described limiting member 1211, as shown in FIG. 11, the amount of original bundles entering the feeding nip is restricted for thin original bundles such as slips, It is possible to reduce the space K between the feeding nip and the front end of the original bundle and suppress the deflection of the original S2 in the space K, thereby suppressing the turning and jamming of the front end of the original S2.

  Since the restricting member 1211 is retracted with respect to a heavy document bundle, the contact area between the document S and the feeding roller 110 does not change and the conveyance force does not decrease, so that the document S is not unfed. In addition, a thick original S such as a credit card also receives the conveying force of the feeding roller 110, and the original S pushes the restricting member 1211 so that it is retracted.

Note that such a restricting member 1211 is provided so that the document S is in sliding contact with the separation roller 12 on both the left and right sides of the separation feeding unit, so that a considerable amount of paper dust is generated even in the sliding contact portion. There is a fear. In the present embodiment, since the arranged downstream region Z ₂ and extending downstream of the double feed sensor 40 and the movement detecting sensor 45 as described above from the gaps between the feed roller unit 11, the respective sensors 40, 45 Further, it is possible to effectively avoid the influence of the paper dust generated by the contact of the limiting member 1211.

  As shown in FIG. 8, a document detection sensor 90 for detecting the arrival of the document S is provided at a position between the plurality of feeding rollers 110. The document detection sensor 90 is pivotally supported by a detection sensor shaft 90a and is suspended by its own weight. In order to be able to retract around the detection sensor shaft 90a regardless of the type of the document S that arrives, it is configured to be as light as possible and almost free from friction due to friction and the like.

  A feeding roller guide 17 is provided on the upstream side of the document detection sensor 90. The feed roller guide 17 is supported by a guide shaft 17a provided on the upstream side of the feed roller 110, and extends toward the downstream side in the feed direction.

  The feeding roller guide 17 is moved in a direction orthogonal to the feeding direction (in the thickness direction of the transported document) so that the tip is moved from the feeding roller 110 side to the separation roller 12 side by the guide urging means 17b shown in FIG. When the document S is urged and the document S does not exist on the mounting table 1, the leading end protrudes from the outer periphery of the feeding roller 110 when viewed from the axial direction of the feeding roller 110 (direction shown in FIG. 13). In a state of being urged to the position, it is positioned by a not-shown abutting portion.

  When a plurality of documents S are placed on the placing table 1 by the feeding roller guide 17, the feeding roller guide 17 moves toward the feeding roller 110 against the biasing means as shown in FIG. Be energized. In addition, when the number of originals S is small, particularly when only one thin original S is placed on the placement table 1 or when there are few originals S to be placed, as shown in FIG. The document is urged toward the separation roller 12 by the roller guide 17.

  While the leading edge of the document S is in sliding contact with the feeding roller guide 17, the document S is prevented from coming into contact with the feeding roller 110. With this configuration, when the document S is set on the mounting table 1, it is possible to prevent the document S from being caught by the feeding roller 110 and being unable to be set at a predetermined setting position when the document S is small.

  In the present embodiment, as shown in FIG. 8, the leading end on the separation roller 12 side (downstream in the feed direction) of the feed roller guide 17 is located between both sides of the feed roller 110 and between the feed rollers 110. Since the feeding roller guide 17 is provided so as to be arranged, the leading edge of the document S is more likely to come into contact with the feeding roller 110 when the number of document bundles on the mounting table 1 is reduced. It can be surely prevented.

  Further, the feeding roller guide 17 can locally lift the original S and apply the stiffness to the original S. According to the feeding roller guide 17 in the present embodiment, the plurality of feeding roller guides 17 urge the document S in the direction of lifting the document S on the upstream side of the feeding roller 110, and perform feeding in a state in which the stiffness is applied. The document S can enter the nip between the roller 110 and the separation roller 12.

  In addition, since the amount of the document S that still enters the nip can be limited by the above-described limiting member 1211 coming into contact with the weakly original document S, it is effective to cause the leading edge of the document S to turn over or a paper jam. Can be suppressed. Here, in the present embodiment, the turning of the front end of the document includes a state in which the document is fed with the wrinkles approached as a result of the turning.

  In the present embodiment, a cover member a3 shown in FIG. 4 is provided so as to cover the feeding roller 110 and the feeding roller guide 17. The guide shaft 17a and the guide urging means 17b of the feed roller guide 17 are attached to the opposite side (the lower side in FIG. 12) of the cover member a3 of the feed roller 110 to the side where the document slides. The member a3 and the feeding roller guide 17 constitute an integral unit.

  By removing the cover member a3 of the feeding roller 110, the shaft and bearing of the feeding roller 110 are exposed, and the feeding roller 110 can be detached from the sheet conveying apparatus A. The cover member a3 of the feed roller 110 is provided with a concave storage portion at a position where the leading end of the document stopper 14 is stored.

  In the present embodiment, the limiting member 1211 is supported by the separation rocking member 121, so that deterioration of the feeding performance can be suppressed even when the feeding roller 110 and the separation roller 12 are worn.

  In the configuration in which the restricting member 1211 is supported by the fixed component 15 that does not swing instead of the separation swinging member 121 as shown in FIG. 14A, when the feeding roller 110 or the separation roller 12 is worn, the separation roller 12 is fed. 14B, the inter-pitch pitch m between the feeding roller 110 and the separation roller 12 is shortened, and the gap n ′ between the limiting member 1211 and the feeding roller 110 is the gap n. 11 becomes larger, and the space K in FIG. 11 becomes larger at the time of feeding, so that the effect of reducing the turning edge of the original and the paper jam is reduced.

  However, as shown in FIG. 15 (a), if the limiting member 1211 is supported on the swinging separation rocking member 121, when the feeding roller 110 and the separation roller 12 are worn, FIG. Thus, even if the inter-pitch pitch m between the feeding roller 110 and the separation roller 12 is shortened, the gap n ″ between the limiting member 1211 and the feeding roller 110 becomes smaller than the gap n by the amount of wear of the separation roller 12.

  Therefore, since the space K in FIG. 11 does not become large as shown in FIG. 14B during feeding, feeding problems such as jams can be suppressed. Actually, the amount of wear of the separation roller 12 is smaller than the amount of wear of the feed roller 110, and the gap n ″ is not too narrow to prevent feeding.

  As shown in FIG. 16, the rib portion 121 b and the limiting member 1211 in the present embodiment are disposed on the side of the feeding roller 110 facing the friction member 11 c. The friction member 11c is formed on the outer periphery of the feed roller 110 with a material such as rubber so that the document S can be easily gripped.

  The feeding roller 110 has two friction members 11 c, and a rib part 121 b and a limiting member 1211 are arranged on both sides of the two separation rollers 12. Since the rib 121b and the limiting member 1211 are opposed to the friction member 11c, the document S is sandwiched between the rib 121b and the limiting member 1211 and the friction member 11c, and the frictional force of the friction member 11c is increased. The conveyance force is increased and the non-feeding of the document S is prevented.

  In other words, the narrow separation roller 12 is provided for the feed roller 110, and the restriction member 1211 is provided for the feed roller 110 using a space in a portion where the separation roller 12 is not disposed. In this way, it is possible to arrange the restricting member 1211 while securing the width of the separation roller 12 necessary for the width of the feeding roller 110. In particular, as in the present embodiment, the conveyance path is in the vertical direction. This is effective for reducing the size of a relatively small standing document feeder.

  The arrangement of the rib portion 121b and the limiting member 1211 is not limited to this. As shown in FIG. 17, the rib portion 121 b and the limiting member 1211 may be disposed between the two separation rollers 12.

  Even in this arrangement, the original S is sandwiched between the rib 121b and the restricting member 1211 and the friction member 11c and the frictional force of the friction member 11c is increased, as in the embodiment of FIG. The force is increased and the non-feeding of the document S can be suitably prevented.

  Further, as shown in FIGS. 18 and 19, the rib portion 121 b and the limiting member 1211 may be arranged at a position not facing the friction member 11 c, that is, at a position shifted in the thrust direction of the feeding roller 110.

  The rib 121b and the limiting member 1211 are disposed between the two friction members 11c in FIG. 18, and are disposed on both sides of the two friction members 11c in FIG. When arranged in this manner, the feeding roller 110 is not opposed, so that the action of sandwiching the document S between the restricting member 1211 and the friction member 11c is reduced. The member 1211 can exert an action of pressing against a light document bundle without being retracted, and the feeding performance can be improved.

  FIG. 20 is a cross-sectional view for explaining the arrangement of the rib portion 121b and the limiting member 1211. As shown in FIG. 20B, the rib portion 121b and the restricting member 1211 are arranged at a position close to the feeding nip on the opposite side of the friction member 11c.

  As a result, the distance exposed from the conveyance path having the outer diameter of the feeding roller 110 (from the point a upstream of the outer diameter of the roller to the point b facing the protruding portion 121d) becomes longer, and the area of the feeding roller 110 with which the document bundle contacts. Can increase the conveyance power.

  Specifically, as shown in FIG. 16, by disposing the rib portion 121b and the restricting member 1211 on both sides of the separation roller, the rib portion 121b and the limiting member 1211 can be disposed on the opposite side of the friction member 11c and close to the feeding nip, thereby increasing the conveyance force. can do.

  More specifically, as shown in FIG. 20B, the surface 1211e formed on the feeding roller 110 side of the restricting member 1211 is the outer peripheral surface of the separation roller 12 and its thrust direction (direction orthogonal to the feeding direction). ) And are arranged so as to form the same outer surface. By doing so, floating or the like can be suppressed by the restricting member 1211 with respect to the fed document S, and the conveyance performance can be improved.

  However, the arrangement of the restricting member 1211 is not limited to the above-described configuration. In an apparatus or the like that does not convey a heavy bundle of documents and does not require a small conveying force, a frictional force as shown in FIG. The distance exposed from the conveying path at the outer diameter of the member 11c (from the point a upstream of the roller outer diameter to the point b facing the protruding portion 121d) may be shortened.

  As shown in FIG. 9, the limiting member 1211 has an abutting surface 1211c and an inclined surface 1211d against which the original bundle abuts. The abutting surface 1211c is substantially perpendicular to the feeding direction, and the inclined surface 1211d is a surface inclined in the feeding direction on the feeding roller 110 side of the abutting surface 1211c.

  Then, by making the abutting surface 1211c substantially perpendicular to the feeding direction, the upper layer portion of the document bundle is prevented from entering the feeding nip, and the inclined surface 1211d is disposed on the feeding roller 110 side of the abutting surface 1211c. By making the surface inclined in the feeding direction, the lower layer portion of the original bundle can easily enter the feeding nip.

  Further, in the present embodiment, as shown in FIG. 8, a one-way clutch 11 a is provided between the feeding roller shaft 11 b that rotates the feeding roller 110 and each feeding roller 110.

  That is, when the document S sent out by the feed roller 110 is provided on the downstream side of the document S and is about to be pulled out by the transport roller 21 having a higher peripheral speed than the feed roller 110, the feed roller 110 is moved to the document S. Is configured to be able to rotate in the direction of rotation.

  In this case, as a method of contact between the driving gear (not shown) that transmits the driving force to the feeding gear unit 112 and the feeding gear unit 112, the driving gear causes the feeding gear unit 112 to be rotated by a rotation restricting unit that will be described later. The contact state in the driving state is maintained.

  In the case where there is no rotation restricting means, in this state, when the document S is removed from the feed roller 110, the separation roller 12 press-contacting the feed roller 110 may try to push the feed roller 110 back upstream. . At this time, the feeding roller 110 and the feeding gear unit 112 are rotated in the negative direction by the amount of backlash existing between the feeding gear unit 112 and the drive gear, and then the document placed on the table 1. The tip of S may be returned.

  When the leading edge of the document S is returned in the negative direction, the feeding performance is deteriorated. To prevent this, in this embodiment, for example, a feeding roller shaft is used as a rotation restricting unit. It is preferable to provide an urging means (for example, a compression spring) for determining the position of each feeding roller portion 11 in the axial direction of 11b.

  Such an urging means may be provided between the wheel portion 111 and the bearing 110a of the feed roller shaft 11b, but the feed gear portion 112 is provided between the feed roller portions 11 as in the present embodiment. In the case of providing in the above, it is preferable to provide between the feeding gear portion 112 and each feeding roller portion 11.

  As a result, each of the feed roller portions 11 is urged toward the both end portions (the bearing 110a side) of the feed roller shaft 11b in the axial direction of the feed roller shaft 11b, and the feed gear portion 112 is moved toward the feed roller shaft. 11b can be arranged at the center.

  Therefore, the drive transmission position from the drive gear shaft 102 is the central portion of the feed roller 110, that is, the central portion in the longitudinal direction of the feed roller shaft 11b, and the load balance of the left and right feed roller portions 11 is stabilized and the feed roller shaft 11b is stabilized. The feeding performance can be improved. One bearing 110a is substantially U-shaped and is fixed so as not to rotate with respect to the apparatus main body A1.

  With this configuration, it is possible to prevent the document S from returning in the negative direction, and the gears collide with each other when the feeding gear unit 112 is returned by the amount of backlash between the feeding gear unit 112 and the drive gear shaft 102. It is possible to prevent the occurrence of hitting sounds.

  When the urging means is provided in the present embodiment, as described above, it is possible to prevent the generation of a hitting sound due to contact between the gears. When sound detection means such as a sensor (microphone) capable of detecting sound is provided in the vicinity of the roller 110, a remarkable effect can be obtained in the sheet conveying apparatus A that detects jamming (paper jam) of the document S. The accuracy of detecting jams (paper jams) can be improved.

(Second Embodiment)
The apparatus configuration of the second embodiment is substantially the same as the apparatus configuration of the first embodiment, and the difference is that the ultrasonic wave transmission unit 41, the reception unit 42, and the movement detection sensor 45 are distributed to the board. Is.

  According to FIG. 1, the ultrasonic wave transmission part 41 is located on the same side with respect to the movement detection sensor 45 and the transport path RT. As shown in FIG. 23, these sensors, the ultrasonic wave transmitter 41, and the movement detection sensor 45 are mounted on different substrates 100A and 100B, respectively.

  When the central portion of the feeding roller 110 shown in FIG. 5 is narrow or when there is a narrow portion in the path connecting the movement detection sensor 45 and the device that controls the movement detection sensor 45, the movement detection sensor 45 is used in a general printed circuit board. There is a risk that you can not place. Therefore, as shown in FIG. 24A or 24B, the movement detection sensor 45 is mounted on an FPC (Flexible Printed Circuits). In FIG. 24, the movement detection sensor 45 is exemplified as a structure provided on the first housing U1 side, but may of course be provided on the second housing U2 side.

  Since the FPC itself is thin and bendable, the substrate wiring can be passed through a narrow portion by bending. Therefore, even when the central portion of the feed roller 110 is narrow, the movement detection sensor 45 can be arranged. Compared to the first embodiment, the second embodiment increases the degree of freedom in disposing both sensors while avoiding the feeding roller 110 and the separation roller 12 shown in FIG. 5 and leads to a reduction in the size of the apparatus.

(Third embodiment)
In the apparatus of the first embodiment, the movement detection sensor 45 is provided upstream of the double feed detection sensor 40 in the feeding direction, and the movement detection sensor 45 and the double feed detection sensor 40 are arranged in a row. Since the distance between the two sensors is long, a configuration has been described in which through holes are individually provided in the conveyance path so that the detection target of both sensors can be detected. On the other hand, in this embodiment, the distance between the movement detection sensor 45 and the double feed detection sensor 40 may be shortened, and a common through hole may be provided for both sensors.

  Further, as shown in FIG. 25, if the double feed detection sensor 40 is arranged close to the nip portion N side and can be brought close to the movement detection sensor 45, not only movement detection but also double feed detection is detected at an early stage. It becomes possible.

  In the apparatus of the first embodiment, a structure in which the movement detection sensor 45 is provided on the upstream side in the feeding direction from the double feed detection sensor 40 and the movement detection sensor 45 and the double feed detection sensor 40 are arranged in a row will be described. However, in the present embodiment, as shown in FIGS. 25A and 25B, the movement detection sensor 45 is provided in another area.

For example, as shown in FIG. 25 (a), on both sides in the axial direction of the feed roller shaft 11b of the feed roller 110, a portion where the feed roller portion 11 and the separation roller 12 are not in contact pressure, that is, a nip portion on one side of the downstream region Z ₂ in the feeding direction downstream side from the portion other than the N may be provided with a movement detection sensor 45. Thereby, it becomes possible to arrange the double feed detection sensor 40 close to the nip portion N side, and it is possible to detect double feed detection at an early stage. In this case, while the other side as well the side of the downstream region Z _2, i.e., the provided mobile detection sensor 45 on both sides of the downstream region Z _1, may be tracked detect the movement of the original left and right.

Further, as shown in FIG. 25B, a nip portion N between the feeding roller portion 11 of the feeding roller 110A and the separation roller 12 is arranged at the center of the feeding roller portion 11, and both sides thereof are feeding rollers. In the case where the separation feeding unit is configured such that the pressure roller 11 and the separation roller 12 are not in contact with each other, a space for arranging the double feed detection sensor 40 can be widely provided in the gap between the feeding roller units 11. In this case, as shown in the drawing, a movement detection sensor 45 may be provided on one side in the axial direction of the feed roller shaft 11 of the feed roller 110A, as in FIG. In this case, while the other side as well the side of the downstream region Z _2, i.e., the provided mobile detection sensor 45 on both sides of the downstream region Z _1, may be tracked detect the movement of the original left and right.

  Of course, the present invention is not limited to this, and as shown in FIG. 26, when a portion where the separation roller 12 is not contacted is provided on the gap side of each feed roller portion 11, the gap between the feed rollers 11. Can be expanded. Therefore, since the downstream area Z2 on the downstream side can be formed wide from the gap between the feeding rollers 11, the double-feed detection sensor 40 and the movement detection sensor 45 are supplied to the downstream area Z2, as shown in FIG. It may be provided in the width direction orthogonal to the feeding direction.

  Further, when the double feed detection sensor 40 and the movement detection sensor 45 as shown in FIG. 26 are installed, both outer sides of the respective feed roller portions 11 in the feed roller 110A in the axial direction of the feed roller shaft 11b. The separation roller 12 may be contacted to the end of the roller.

(Fourth embodiment)
In the present embodiment, as shown in FIG. 27, the movement detection sensor 45 may be disposed so as to face the gap between the feeding roller portions 11 in the feeding roller 110. In this case, since the movement (skew) of the document can be detected immediately after the nip portion N formed by the feeding roller unit 11 and the separation roller 12 and at a place where the influence of the paper dust is small, separation of the bound document is performed. When there is an abnormality such as skew in feeding, the separation feeding operation can be temporarily stopped. In addition, if the above-described skew detection can be performed before reaching the double feed detection sensor 40, a control for turning off the detection of the double feed detection sensor 40 may be performed.

  In the present embodiment, a cover member a3 that covers the feeding roller 110 is disposed. In this case, a window portion (not shown) is provided through the cover member a3, and when the cover member a3 is closed, the window portion of the cover member a3 is opposed to the movement detection sensor 45 on the apparatus main body side. As a result, the movement detection sensor 45 is arranged in the gap between the feeding roller portions 11, and the movement detection sensor 45 can track and detect the movement of the document whose posture is relatively stable at the left and right nip portions through the window portion. . In addition, the detection area of the movement detection sensor 45 is less affected by paper dust, enables highly accurate tracking detection, can track the movement of the document immediately after the nip portion, and can detect abnormal feeding. Since the detection can be performed immediately, for example, before the document is damaged, it is possible to appropriately take subsequent measures such as temporarily stopping the separation feeding operation and error processing.

(Other embodiments)
As mentioned above, although this invention was demonstrated in detail based on each embodiment, this invention is not limited to each embodiment mentioned above.

  In each of the above-described embodiments, the configuration in which the feeding gear unit 112 is provided correspondingly between the two feeding roller units 11 included in the feeding roller 110 has been described. However, the present invention is of course limited to this. For example, as shown in FIG. 28, a feed gear portion 112 that transmits drive to the feed roller 110 is provided on one end portion side of the rotary shaft of the feed roller 110, and the other end portion of the rotary shaft is a bearing. Alternatively, the feeding roller 110 held rotatably may be employed.

  In each of the above-described embodiments, the document conveying apparatus using the two motors 3 and 4 has been exemplified. However, the present invention is of course not limited thereto, and for example, as illustrated in FIG. You may make it control the drive system of a conveying apparatus.

  In the case of the document conveying apparatus as shown in FIG. 29, the conveyance force is arranged so that the driving force of the single motor M on one side in the width direction of the apparatus orthogonal to the document conveying direction is straddled across the conveyance path. Transmission is performed across the conveyance path to the drive transmission mechanism X on the other side in the width direction of the apparatus using the conveyance roller shaft 21a of the roller 21.

  As a result, the driving force of a single motor M can be transmitted to the feeding roller 110 and the separation roller 12, and the size or size can be reduced by reducing the number of parts compared to a configuration using a plurality of motors. An original conveying apparatus suitable for reduction in cost and weight can be realized.

  In each of the above-described embodiments, the description has been given using the structural example in which the feeding roller unit 11 is provided detachably with respect to the wheel unit 111. However, the present invention is of course not limited thereto, and for example, the one-way clutch 11a. May be left on the feed roller shaft 11b and removed including the other wheel portions 111.

  Alternatively, as shown in FIG. 30, the wheel portion 111 is divided into two in the radial direction, the inner wheel portion (first core portion) 111a is fitted to the one-way clutch portion 11a, and the outer wheel portion (second core portion) 111b. May be joined to the feeding roller unit 11 and the feeding roller unit 11 may be detachable from the outer periphery of the inner wheel unit 111a together with the outer wheel unit 111b. In this case, the feeding roller portion 11 and the outer wheel portion 111b are replacement parts.

  Further, in each of the above-described embodiments, the structure in which the drive transmission to the separation roller 12 is performed from one end side with respect to the shaft of the separation roller 12 has been described as an example, but the present invention is not limited to this. For example, a separation roller structure as shown in FIG. 31 may be used.

  As shown in FIG. 31, when a configuration in which the roller is divided into two on the left and right in the axial direction is applied as the configuration of the separation roller 12, a gear portion 12a for driving transmission is provided for the shaft portion 12b between these rollers. Similarly to the feeding roller 110, an improved separation roller 12 to which a drive transmission structure with no difference in the left and right balance between the rollers may be applied.

  For such a gear portion 12a of the separation roller 12, the motor 3 is driven through the power transmission gear portions G1 and G2 on the other end side of the rotary shaft Ga, one end of which is connected to the drive transmission mechanism X. Power is transmitted. Then, both end portions 12c of the shaft portion 12b of the separation roller 12 are rotatably held by bearings (not shown).

  If such an improved type separation roller 12 is used, it is possible to reduce the backlash and the like in each of the feeding roller 110 and the separation roller 12, so that not only the separation feeding performance is further improved, but also the feeding roller 110. If the individual one-way clutch portion 11a is provided, the effect of suppressing the skew chain can be further enhanced.

  Further, as described in the above-described embodiment, the separation roller 12 is attached to the separation swing member 121 so as to be swingable. When the gear portion for driving transmission to the separation roller 12 is on one end side in the axial direction of the separation roller 12, the side on which the gear portion is provided becomes a load on the gear portion, making it difficult to swing. The other end side easily swings.

  As a result, a difference occurs between the left and right swinging operations, and an unbalanced load is generated on the rotating shaft of the separation roller 12. On the other hand, by providing a gear portion between the rollers, the difference between the left and right swinging operations is reduced, and the pressing force to the feeding roller is equalized, so that the document is skewed during feeding. Can be suppressed.

  When the improved separation roller 12 as described above is employed, the individual one-way clutch portion 11a is provided on the feeding roller 110 in each of the above-described embodiments, that is, the wheel portion 111 on which each feeding roller portion 11 is provided. It is not necessary to use the feeding roller 110 provided with the feeding gear unit 112 between the feeding roller units 11 or to the wheel unit 111 on which each feeding roller unit 11 is provided. A one-way clutch portion 11a may be provided, and a feeding roller that does not have the feeding gear portion 112 provided between the feeding rollers 110 may be employed.

  Further, when the improved separation roller 12 as described above is employed, a one-way clutch is not provided in each feed roller portion of the feed roller, and a feed gear portion between the feed roller portions of the feed roller is provided. You may provide a one-way clutch in the drive gear part which transmits a drive.

  Even in this case, since the drive transmission to the feeding roller is performed between the feeding roller portions, the feeding roller portion can perform separation feeding with equal stress balance on the left and right even when urged by the separation roller. realizable. Further, in the case where the one-way clutch is provided in the drive gear portion in this way, the distance between the feeding roller portions can be kept constant as a configuration in which the wheel portions of the feeding rollers are connected to each other.

  Here, in the above-described embodiment, the structure in which the movement detection sensor 45 is mounted on the substrate 102 of the ultrasonic reception unit 42 in the double feed detection sensor 40 has been described, but the mounting form is not particularly limited. For example, the structure shown in FIGS. 32 and 33 may be used.

  As shown in FIG. 32A, the light source 451 and the imaging unit 452 included in the movement detection sensor 45 are mounted on the upper surface of the substrate 102 on the path RT side, and energized through the cable C connected to the substrate 102. Is called. In addition, the movement detection sensor 45 includes a cylindrical member 453 disposed on the substrate 102 so as to surround the light source 451 and the imaging unit 452, and further, a light transmitting member (an optical filter or a glass substrate) is provided in the opening of the cylindrical member 453. 454 is provided to be inclined with respect to the route RT.

  The substrate 102 on which such a movement detection sensor 45 is mounted is joined to the back surface of the second housing U2 on the side opposite to the path RT via an attachment member 102a. At this time, the second housing U <b> 2 is provided with a through hole in a portion facing the ultrasonic wave receiver 42 and the movement detection sensor 45. Thereby, it is possible to detect the reception of the ultrasonic wave and the movement of the document from the route RT on the substrate 102 mounted on the second housing U2. In addition, the board | substrate 101 with which the ultrasonic transmission part 41 was mounted is joined to the 1st housing | casing U1 via the attachment member 101a.

  As another form, as shown in FIG. 32B, a pedestal 102b may be provided on the substrate 102, and the movement detection sensor 45 may be provided on the upper surface of the pedestal 102b. Thereby, it is possible to detect the movement of the document at a location close to the route RT.

  32, the movement detection sensor 45 is provided on the substrate 102 side. However, the movement detection sensor 45 may be provided on the substrate 101 on which the ultrasonic wave transmission unit 41 is mounted. However, it may be provided for the substrates 101 and 102 on both sides so as to sandwich the route RT. In the latter case, it is possible to detect double feed based on the difference in the output value of each movement detection sensor 45. In the case of a document with a sticky note or the like, the double feed detection sensor 40 detects double feed, but the movement detection sensors 45 on both sides can separately detect the movement of overlapped documents. It becomes possible to easily detect the double feed state.

  33A, the sensor substrate (third substrate) 455 on which the light source 451 of the movement detection sensor 45 and the imaging unit 452 are mounted is attached to the substrate 102 on which the ultrasonic receiving unit 42 is mounted. On the other hand, it may be connected by a cable C1 such as FFC or FPC so as to be able to communicate and energize. In this case, the sensor substrate 455 is fixed via a connecting member 452 to a peripheral portion on the side opposite to the path RT side in the through hole provided in the second housing U2. This makes it easy to detect the movement of the document by the movement detection sensor 45 near the route RT. Alternatively, as shown in FIG. 33B, the sensor substrate 455 may be electrically connected to one surface of the substrate 102 on the path RT side via a lead wire 102b.

Note that, as shown in FIGS. 32A, 32B, and 33B, the second housing U2 and the movement detection sensor 45 are not directly joined but are arranged with a predetermined gap. . Thereby, it is possible to prevent the vibration accompanying the driving of the feeding and conveying system from being directly transmitted to the movement detection sensor 45 through the second housing U2.

A Document feeder A1 Apparatus body S Document H Hinge part U1 First housing (lower unit)
U2 Second housing (upper unit)
DESCRIPTION OF SYMBOLS 1 Mounting stand 2 Discharge tray 3, 4 Motor 10 1st conveyance part 11 Feed roller 11a One-way clutch 11b Feed roller shaft 11c Friction member 11d Cylindrical part 12 Separation roller 12a Torque limiter 13 Pick arm 14 Original stopper 20 Second conveyance part 21 transport roller 22 driven roller 30 third transport unit 31 transport roller 32 driven roller 40 double feed detection sensor 45 movement detection sensor 50, 60 medium detection sensor 70 image reading unit 80 control unit 84 communication unit 90 document detection sensor 101, 102 substrate 115 Compression spring 121 Separation rocking member 1211 Limiting member 1212 Spring

Claims (7)

A separation feeding unit that separates and feeds the sheets one by one;
A transport unit that transports a sheet separated by the separation feeding unit along a transport path;
A sheet detection unit that is disposed downstream of the separation feeding unit in the sheet feeding direction, and detects a sheet,
The sheet detection unit includes a double feed detection sensor that detects double feed of a sheet, and a movement amount or a movement direction of a feature point included in a sheet image obtained by photographing a sheet passing through the conveyance path. A movement detection sensor for detecting movement;
The double feed detection sensor has an ultrasonic transmission unit and an ultrasonic reception unit that are arranged to face each other with the conveyance path interposed therebetween,
The control board for controlling the sheet detection unit includes a first board on which the ultrasonic wave transmission unit is mounted, and a second board on which the ultrasonic wave reception unit is mounted,
The movement detection sensor is driven by receiving a current from the first substrate or the second substrate. The transport path is formed by a gap between a first casing having an apparatus installation surface and two casings rotatably connected to the first casing,
One of the first substrate and the second substrate is housed in the first housing and the other substrate is housed in the second housing.
The sheet conveying apparatus according to claim 1, wherein the movement detection sensor is provided on the second housing side and is driven by energization from the other substrate. The separation feeding unit includes: a feeding roller in which first and second roller units are provided with a space between the rotation shafts; and a pressure contacted with a part of the feeding roller. And a separation portion that forms a nip portion therebetween,
The double feed detection sensor and the movement detection sensor are a region extending downstream from the portion other than the nip portion in the separation feeding unit to the downstream side in the sheet feeding direction and before reaching the conveyance unit, Has a sheet detection area,
The transport path is formed by a gap between a first casing having an apparatus installation surface and two casings rotatably connected to the first casing,
One of the first substrate and the second substrate is housed in the first housing and the other substrate is housed in the second housing.
The sheet conveyance device according to claim 1, wherein the movement detection sensor is provided on the first housing side and is driven by energization from the one substrate. A third substrate for controlling the movement detection sensor;
The sheet conveying apparatus according to claim 1, wherein the third substrate is mounted on one surface of the first substrate or the second substrate on the conveying path side. The conveyance path is provided with first and second through holes penetrating in the thickness direction through one wall portion having a wall surface facing one surface of the conveyed sheet,
The movement detection sensor is provided on the opposite side of the first through hole to the conveyance path side,
The ultrasonic transmission part and the ultrasonic reception part which comprise the said double feed detection sensor were provided in the opposite side to the said conveyance path side among said 2nd through-holes. Sheet conveying device. The transport path is provided with one through hole penetrating in the thickness direction through one wall portion having a wall surface facing one surface of the transported sheet,
One of the ultrasonic transmission unit and the ultrasonic reception unit constituting the double feed detection sensor and the movement detection sensor are provided on the opposite side of the through hole from the conveyance path side. Item 2. The sheet conveying apparatus according to Item 1. An image reading apparatus comprising the sheet conveying apparatus according to claim 1.

Images