JP5818859B2 - Document feeder - Google Patents

Description

  The present invention relates to an original conveying apparatus, and more particularly, to an original conveying apparatus that determines whether or not a jam has occurred while an original is being conveyed.

  In an original conveying apparatus such as an image reading apparatus or an image copying apparatus, a jam may occur when the original moves on the conveying path. The document transport device determines whether or not a jam has occurred depending on whether or not the document has been transported to a predetermined position in the transport path within a predetermined time after the start of document transport. Some have a function to stop the operation.

  Conventionally, the paper sheet weight is detected by comparing the attenuation information of the ultrasonic wave when the paper sheet passes between the transmitter and the receiver with the threshold value for detecting the multi-feed. A feed detection device is known. The periphery of the ultrasonic wave reception area of the paper sheet multi-feed detection device is covered with a cylindrical noise blocking wall. (See Patent Document 1).

  An abnormality determination device is known that includes a microphone that detects sound emitted from a test object and a determination unit that determines the presence or absence of abnormality of the test object based on the detection result (see Patent Document 2). .

  In addition, ultrasonic waves are transmitted from the transmitter of the ultrasonic sensor facing the transfer paper conveyance path to the receiver, and the output signal due to attenuation when the transfer paper passes between the transmitter and the receiver is detected by double feed. There is known a double feed detection device that detects double feed in comparison with a threshold for use. In order to prevent disturbance, a cover is provided on the receiver side of the double feed detection device (see Patent Document 3).

  In addition, a sheet stacking unit capable of stacking sheets, an optical sensor for detecting the presence or absence of sheets stacked on the sheet stacking unit, and a sheet separating unit by sheet based on the detection result of the optical sensor A sheet feeding apparatus for feeding is known. A light blocking member that blocks external light incident on the optical sensor is provided so as to be retractable from the sheet insertion opening of the sheet stacking unit (see Patent Document 4).

JP 2008-207885 A JP 2006-201316 A JP-A-2005-82350 JP 2010-30772 A

  When a jam occurs, a loud noise is generated on the conveyance path. For this reason, there is a possibility that the occurrence of a jam can be detected by detecting the sound generated in the conveyance path with a microphone (MIC). However, if a sound other than the sound due to the occurrence of a jam is superimposed on the sound collected by the microphone, the jam detection accuracy may be lowered.

  An object of the apparatus disclosed in the present specification is to reduce a decrease in the detection accuracy of a jam based on a sound generated in a conveyance path due to a sound other than a sound due to the occurrence of a jam.

  A document conveying device according to one aspect of the present invention includes a roller pair that is a pair of a feed roller and a separation roller that are opposed to each other with a document conveying path interposed therebetween, and a document conveying path in which one of the rollers is disposed. A sound collecting portion provided on the same side as one side, a sound insulation member provided on a straight line between the nip portion of the roller pair and the sound collecting portion, and a sound signal corresponding to the sound collected by the sound collecting portion. A sound signal output unit for outputting and a sound jam determination unit for determining whether or not a jam has occurred based on the sound signal.

  According to the apparatus disclosed in the present specification, it is possible to reduce a decrease in the accuracy of jam detection based on a sound generated in the conveyance path due to a sound other than the sound due to the occurrence of the jam.

2 is a perspective view showing a document conveying device 100. FIG. 2 is a diagram for explaining a conveyance path inside document conveying apparatus 100. FIG. FIG. 3 is an enlarged view of a portion A in FIG. 2. It is a perspective view in the state where upper case 102 was opened. It is a perspective view in the state where the upper housing 102 was opened and the guide member 107c was removed. FIG. 6 is an enlarged view of a portion B in FIG. 5. FIG. 6 is a perspective view of a state where the upper housing is opened and the guide member 107c and the cover 201 are removed. It is a figure for demonstrating the sound and conveyance sound by jam generation. It is a figure for demonstrating a sound insulation member. It is a figure for demonstrating each surface which opposes a sound collection location and a retard roller. It is a figure for demonstrating the 1st example of a sound insulation member. It is a figure for demonstrating the 2nd example of a sound insulation member. It is a figure for demonstrating the 3rd example of a sound insulation member. It is a figure for demonstrating the 4th example of a sound insulation member. 2 is a block diagram illustrating a schematic configuration of a document conveying apparatus 100. FIG.

  Hereinafter, an original conveying apparatus according to an aspect of the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and equivalents thereof.

  FIG. 1 is a perspective view showing a document conveying device 100 configured as an image scanner. The document transport apparatus 100 includes a lower casing 101, an upper casing 102, a document table 103, a discharge table 105, an operation button 106, and the like.

  The lower housing 101 and the upper housing 102 are made of a resin material. The upper casing 102 is disposed at a position covering the upper surface of the document conveying apparatus 100, and is engaged with the lower casing 101 by a hinge so that it can be opened and closed when a document jam occurs or the inside of the document conveying apparatus 100 is cleaned. Match.

  The document table 103 is engaged with the lower housing 101 so that a document can be placed thereon. The document table 103 is provided with side guides 104a and 104b that are movable in a direction perpendicular to the document conveyance direction, that is, in the left-right direction with respect to the document conveyance direction. By positioning the side guides 104a and 104b according to the width of the document, the width direction of the document can be regulated.

  The discharge table 105 is engaged with the lower casing 101 by a hinge so as to be rotatable in the direction indicated by the arrow A1, and can hold the discharged document in an open state as shown in FIG. The operation button 106 is disposed on the surface of the upper housing 102 and generates and outputs an operation detection signal when pressed.

  FIG. 2 is a diagram for explaining a conveyance path inside the document conveyance device 100. A first original detection unit 110, feed rollers 111a and 111b, retard rollers 112a and 112b, a first microphone 113a, a second microphone 113b, and a second original detection unit 114 are provided in the conveyance path inside the original conveyance device 100. . In addition, an ultrasonic transmitter 115 a, an ultrasonic receiver 115 b, first conveyance rollers 116 a and 116 b, first driven rollers 117 a and 117 b, a third original detection unit 118, a first conveyance path inside the original conveyance device 100. An imaging unit 119a and a second imaging unit 119b are provided. Second conveying rollers 120a and 120b, second driven rollers 121a and 121b, and the like are provided in the conveying path inside the document conveying apparatus 100. The retard rollers 112a and 112b are examples of separation rollers.

  Hereinafter, the sheet feeding rollers 111a and 111b may be collectively referred to as the sheet feeding roller 111, the retard rollers 112a and 112b may be collectively referred to as the retard roller 112, and the first conveying rollers 116a and 116b may be generally referred to as the first conveying roller 116. . The first driven rollers 117a and 117b are collectively referred to as a first driven roller 117, the second transport rollers 120a and 120b are generally referred to as a second transport roller 120, and the second driven rollers 121a and 121b are collectively referred to as a second driven roller 121. There is a case.

  The upper surface of the lower casing 101 forms a lower guide 107a of the document conveyance path, and the lower surface of the upper casing 102 forms an upper guide 107b of the document conveyance path. In FIG. 2, an arrow A2 indicates the conveyance direction of the document. Hereinafter, upstream means upstream in the document transport direction A2, and downstream means downstream in the document transport direction A2.

  The first document detection unit 110 includes a contact detection sensor disposed on the upstream side of the paper feed roller 111 and the retard roller 112, and detects whether or not a document is placed on the document table 103. The first document detection unit 110 generates and outputs a first document detection signal whose signal value changes depending on whether the document is placed on the document table 103 or not.

  Each of the first microphone 113a and the second microphone 113b collects sound generated while the document is being conveyed, and outputs an analog signal generated from the collected sound. The first microphone 113 a and the second microphone 113 b are fixed to a frame 108 inside the upper housing 102 formed by molding the upper housing 102. The arrangement positions of the first microphone 113a and the second microphone 113b may be on the downstream side of the paper feed roller 111 and the retard roller 112, for example.

  A guide member 107c serving as a guide on the upper side of the conveyance path is provided between the first microphone 113a and the second microphone 113b and the conveyance path. As shown in FIG. 2, the guide member 107c has a surface facing the first microphone 113a and the second microphone 113b. Openings 109a and 109b are provided in the guide member 107c so that sound collection by the first microphone 113a and the second microphone 113b becomes easier.

  The second document detection unit 114 includes a contact detection sensor disposed on the downstream side of the paper feed roller 111 and the retard roller 112 and on the upstream side of the first conveyance roller 116 and the first driven roller 117, and the document is located at that position. Whether or not exists is detected. The second document detection unit 114 generates and outputs a second document detection signal whose signal value changes depending on whether or not a document exists at that position.

  The ultrasonic transmitter 115a and the ultrasonic receiver 115b are examples of an ultrasonic signal output unit, and are arranged in the vicinity of the document conveyance path so as to face each other with the conveyance path interposed therebetween. The ultrasonic transmitter 115a transmits ultrasonic waves. On the other hand, the ultrasonic receiver 115b detects the ultrasonic wave transmitted by the ultrasonic transmitter 115a and passed through the document, and generates and outputs an ultrasonic signal that is an electrical signal corresponding to the detected ultrasonic wave. Hereinafter, the ultrasonic transmitter 115a and the ultrasonic receiver 115b may be collectively referred to as an ultrasonic sensor 115.

  The third document detection unit 118 includes a contact detection sensor disposed on the downstream side of the first conveyance roller 116 and the first driven roller 117 and on the upstream side of the first imaging unit 119a and the second imaging unit 119b. It detects whether or not a document exists at the position. Third document detection unit 118 generates and outputs a third document detection signal whose signal value changes depending on whether or not a document exists at that position.

  The first imaging unit 119a has a contact image sensor (CIS) of the same-magnification optical system type that includes an imaging element made of CMOS (Complementary Metal Oxide Semiconductor) arranged linearly in the main scanning direction. This CIS reads the back side of a document and generates and outputs an analog image signal. Similarly, the second image pickup unit 119b has a CIS of the equal magnification optical system type including CMOS image pickup elements arranged linearly in the main scanning direction.

  This CIS reads the surface of a document and generates and outputs an analog image signal. Note that only one of the first imaging unit 119a and the second imaging unit 119b may be arranged so that only one side of the document is read. Further, instead of CIS, a reduction optical system type image sensor having an image sensor by CCD (Charge Coupled Device) can be used. Hereinafter, the first imaging unit 119a and the second imaging unit 119b may be collectively referred to as an imaging unit 119.

  The document placed on the document table 103 is transported in the document transport direction A2 between the lower guide 107a and the upper guide 107b as the paper feed roller 111 rotates in the direction of arrow A3 in FIG. . Similarly, the document is transported between the lower guide 107a and the guide member 107c in the document transport direction A2.

  The retard roller 112 rotates in the direction of arrow A4 in FIG. When a plurality of documents are placed on the document table 103 by the functions of the paper feed roller 111 and the retard roller 112, only the documents that are in contact with the paper feed roller 111 among the documents placed on the document table 103. Are separated. In addition, conveyance of originals other than separated originals is restricted (prevention of double feeding). The paper feed roller 111 and the retard roller 112 function as a document separation unit.

  The document is fed between the first conveying roller 116 and the first driven roller 117 while being guided by the lower guide 107a, the upper guide 107b, and the guide member 107c. The original is fed between the first imaging unit 119a and the second imaging unit 119b by the first conveying roller 116 rotating in the direction of the arrow A5 in FIG. The document read by the imaging unit 119 is discharged onto the discharge table 105 when the second conveyance roller 120 rotates in the direction of arrow A6 in FIG.

  FIG. 3 is an enlarged view of a portion A in FIG. 2 in which the first microphone 113a and the second microphone 113b are provided. Hereinafter, the first microphone 113a will be described in more detail. Hereinafter, although the 1st microphone 113a is demonstrated, the structure of the 2nd microphone 113b is also the same.

  The first microphone 113 a includes a substrate 130 and a microphone element 131 that is electrically connected to the substrate 130. The microphone element 131 may be, for example, a MEMS (Micro Electro Mechanical Systems) microphone element or an Electret Condenser Microphone (ECM) element. The microphone element 131 converts the sound collected at the position of the sound hole 132 provided on the surface opposite to the connection surface with the substrate into an electric signal. The sound hole 132 corresponds to a sound collection unit.

  The first microphone 113a is fixed to a frame 108 formed by molding the upper housing 102, and the normal of the surface provided with the sound hole 132 is directed obliquely downward. For this reason, the accumulation of foreign matter on the sound hole 132 and its surroundings is reduced.

  A woven cloth 133 is provided on the surface of the microphone element 131 where the sound hole 132 is provided so as to cover the sound hole 132. The woven fabric 133 may be, for example, a cloth mesh having good air permeability. The woven cloth 133 plays a role as a dust-proof member, thereby reducing intrusion of foreign matter into the microphone element 131. In another embodiment, a non-woven fabric may be used instead of the woven fabric 133, but the acoustic performance of the microphone element 131 becomes more uniform when the woven fabric 133 is used than when the non-woven fabric is used.

  The first microphone 113 a includes a cap member 134 for pressing the woven fabric 133 against the microphone element 131. The material of the cap member 134 may be silicon rubber, for example. When the first microphone 113a is assembled, the cap member 134 can be attached to the substrate 130 in two different directions. The cap member 134 is provided with two through holes 135a and 135b. Whichever of the two different orientations the cap member 134 is attached to the substrate 130, one of the through holes 135a and 135b is aligned with the sound hole 132. In the present embodiment, the through hole 135a and the sound hole 132 are aligned.

  The opening 109a provided in the guide member 107c is provided at a position shifted from the position of the first microphone 113a. For example, the opening 109a is provided at a position shifted from the position of the sound hole 132 of the first microphone 113a. In the example of FIG. 3, the opening 109 a is provided downstream in the transport direction from the position of the sound hole 132.

  By shifting the position of the opening 109a and the position of the first microphone 113a, foreign matter that has entered through the opening 109a is less likely to reach the first microphone 113a. Further, it is possible to prevent the first microphone 113a from being damaged due to the high pressure air injected into the opening 109a directly hitting the first microphone 113a during the cleaning by air injection.

  Further, in a state where the upper housing 102 is closed, the guide member 107c is inclined with respect to the horizontal plane. For this reason, it is difficult for foreign matter that has entered from the opening 109a to accumulate on the inner surface of the guide member 107c, that is, the surface facing the first microphone 113a.

  FIG. 4 is a perspective view showing a state where the upper housing 102 is opened, and FIG. 5 is a view showing a state where the guide member 107c is further removed. An example of the structure in the vicinity of the location where the first microphone 113a and the second microphone 113b are attached to the upper housing 102 will be described with reference to FIGS.

  As described above, the upper surface of the lower housing 101 forms the lower guide 107a of the document conveyance path, and the lower surface of the upper housing 102 forms the upper guide 107b of the document conveyance path. The guide member 107c is attached to the downstream side of the retard roller 112 and functions as a guide on the upper side of the conveyance path. The lower casing 101 is provided with a cover 201 that can be removed from the lower casing 101 and opened when the retard roller 112 is replaced or cleaned.

  The first microphone 113a and the second microphone 113b are provided in the back of the guide member 107c. In FIG. 4, the positions of the first microphone 113a and the second microphone 113b are indicated by broken lines. When the guide member 107c is removed as shown in FIG. 5, the first microphone 113a and the second microphone 113b are exposed.

  The first microphone 113a is disposed on the left side of the apparatus center indicated by the alternate long and short dash line 200, and the second microphone 113b is disposed on the right side of the apparatus center 200 when viewed from the upstream side of the conveyance path. For example, the first microphone 113a may be disposed outside the retard roller 112a disposed to the left of the apparatus center 200. The second microphone 113b may be disposed outside the retard roller 112b disposed to the right of the apparatus center 200.

  FIG. 4 shows the positions of the openings 109a and 109b provided in the guide member 107c. The opening 109a is provided at a position on the left side of the apparatus center 200 in the same manner as the first microphone 113a. The opening 109b is provided at a position on the right side of the apparatus center 200, like the second microphone 113b. In the example of FIG. 4, the openings 109a and 109b are provided downstream in the transport direction from the first microphone 113a and the second microphone 113b, respectively.

  FIG. 6 is an enlarged view of a portion B of FIG. 5 to which the first microphone 113a is attached. Wall portions 210, 211, 212, and 213 facing the first microphone 113 a are formed by molding the upper housing 102 at the location where the microphone is installed.

  The wall portion 210 is provided between the first microphone 113a and the retard roller 112. The wall part 210 is provided on the opposite side of the retard roller 112 with the first microphone 113a interposed therebetween, and faces the first microphone 113a. The wall portion 212 is provided on the opposite side of the document conveyance path with the first microphone 113a interposed therebetween, and faces the first microphone 113a. The wall portion 213 is provided on the upstream side of the document conveyance path with respect to the first microphone 113a and faces the first microphone 113a.

  Similarly, for the second microphone 113b, a wall portion provided between the second microphone 113b and the retard roller may be provided in the upper housing 102. A wall portion provided on the opposite side of the retard roller 112 and facing the second microphone 113b across the second microphone 113b may be provided in the upper housing 102. A wall portion provided on the opposite side of the document conveyance path across the second microphone 113b and facing the second microphone 113b may be provided in the upper housing 102. A wall portion provided on the upstream side of the document conveyance path from the second microphone 113b and facing the second microphone 113b may be provided in the upper housing 102.

  FIG. 7 is a perspective view of the state where the upper housing 102 is opened and the guide member 107c and the cover 201 are removed. The upper housing 102 is provided with a roller housing recess 220 formed by molding the upper housing 102 so that the retard rollers 112a and 112b are fitted. The roller accommodating recess 220 is provided on the opposite side of the document conveyance path with the retard roller 112 interposed therebetween, and the inner surface of the roller accommodating recess 220 faces the retard roller 112.

  FIG. 8 is a diagram for explaining a sound caused by a jam and a transport sound. In the case of skew jam or staple jam, a sound generated by jam occurs near both ends 232 in the paper width direction 231 of the conveyance path of the original 230. Skew jam is a paper jam caused by transporting an inclined document. Staple jam is a paper jam caused by the conveyance of a document bound by staples.

  On the other hand, when a document with folds or wrinkles is conveyed, a conveyance sound or separation sound is generated at the nip portion 233 where the document is sandwiched between the paper feed roller 111 and the retard roller 112. When the conveyance sound or separation sound generated in the nip portion 233 propagates as in the example of the arrow 234, there is a concern that the first microphone 113a may detect it. As a result, the conveyance sound and separation sound generated at the nip portion 233 may be erroneously detected as the sound generated by the jam. The same applies to the second microphone 113b.

  FIG. 9 is a diagram for explaining the sound insulating member. The document conveying apparatus 100 includes sound insulating members 235a and 235b for insulating the conveying sound and separation sound generated from the nip portion 233. By providing the sound insulating members 235a and 235b, it becomes difficult for the first microphone 113a and the second microphone 113b to detect the conveyance sound and separation sound generated in the nip portion 233. As a result, the carrier sound and the separated sound other than the sound caused by the occurrence of the jam are not easily superimposed on the collected sounds of the first microphone 113a and the second microphone 113b, and the jam detection accuracy is improved.

  FIG. 10 is a diagram for explaining each surface facing the sound collection point and the retard roller. With reference to FIG. 10, the installation location of the sound insulation member for insulating the conveyance sound and separation sound generated from the nip portion 233 will be described. Reference numeral 240 indicates a document transport path. Reference sign p1 indicates the position of the sound collecting portion of the first microphone 113a, that is, the position of the sound hole 132 of the microphone element 131 of the first microphone 113a. Reference sign p2 indicates a sound collection unit of the second microphone 113b. Hereinafter, the positions of the sound collecting portions of the first microphone 113a and the second microphone 113b are referred to as sound collecting points p1 and p2, respectively.

  Hereinafter, the surface facing the sound collection point p1 will be described. The surface 241 is a surface located between the sound collection point p1 and the retard roller 112. The surface 242 is a surface located between the sound collection point p <b> 1 and the conveyance path 240. The surface 243 is a surface located on the opposite side of the conveyance path 240 with the sound collection point p1 interposed therebetween.

  The surface 244 is a surface located on the opposite side of the retard roller 112 with the sound collection point p1 interposed therebetween. The surface 245 and the surface 246 are surfaces positioned on the upstream side and the downstream side of the document conveyance path 240 with respect to the sound collection point p1, respectively.

  FIG. 11A is a diagram for describing a first example of a sound insulating member. For example, the sound insulating member 260 may be provided on the surface 241 located between the sound collection point p1 and the retard roller 112. For example, the sound insulation member 260 is provided on a straight line between the nip portion 233 and the sound collection point p1. For example, the sound insulating member 260 may be provided so as to cover the solid angle range when the nip portion 233 is viewed from the sound collection point p1.

  FIG. 11B is a diagram for explaining a second example of the sound insulating member. In the example of FIG. 11B, the sound insulation member 260 may be a wall portion that is located between the sound collection point p1 and the retard roller 112 and faces the sound collection point p1. For example, the sound insulation member 260 may be provided so as to cover the solid angle range when the retard roller 112 is viewed from the sound collection point p1. For example, the sound insulation member 260 of FIG. 11B can be realized by the wall portion 210 shown in FIG.

  FIG. 12A is a diagram for explaining a third example of the sound insulating member. In the example of FIG. 12A, the sound collection point p1 is further away from the nip part 233 than the relative positional relationship between the sound collection part p1 and the nip part 233 in FIGS. 11A and 11B. Alternatively, the sound collection point p1 is closer to the conveyance path 240 than the relative positional relationship between the sound collection point p1 and the conveyance path 240 in FIGS. 11A and 11B. For this reason, if a sound insulation member is provided on the surface 241 located between the sound collection point p1 and the retard roller 112, the sound insulation member does not block the straight path between the nip portion 233 and the sound collection point p.

  Therefore, for example, the sound insulation member 261 may be provided on the surface 242 located between the sound collection point p1 and the conveyance path 240. For example, the sound insulation member 261 is provided on a straight line between the nip portion 233 and the sound collection point p1. For example, the sound insulation member 261 may be provided so as to cover the range of the solid angle when the nip portion 233 is viewed from the sound collection point p1.

  FIG. 12B is a diagram for describing a fourth example of the sound insulating member. In the example of FIG. 12B, the sound insulating member 261 may be a wall portion that is located between the sound collection point p1 and the conveyance path 240 and faces the sound collection point p1. For example, the sound insulation member 261 may be provided so as to shield between the sound collection point p <b> 1 and the conveyance path 240, except for the sound collection through hole 262. For example, the sound insulating member 261 in FIG. 12B can be realized by the guide member 107c shown in FIG.

  Note that any of the sound insulation members 260 in FIGS. 11A and 11B may be provided in combination with any of the sound insulation members 261 in FIGS. 12A and 12B. For example, with the guide member 107c attached as shown in FIG. 4, the guide member 107c functions as the sound insulation member 261 in FIG. 12B, and the wall portion 210 shown in FIG. 6 acts as the sound insulation member 260 in FIG. 11B.

  Please refer to FIG. The sound insulation member may be provided on a surface 243 located on the opposite side of the conveyance path 240 with the sound collection point p1 interposed therebetween. An example of the sound insulating member provided on the surface 243 is the wall portion 212 shown in FIG. By providing the sound insulating member on the surface 243, it is possible to reduce propagation of conveyance sound and separation sound that wrap around the space on the opposite side of the conveyance path 240 across the sound collection point p1.

  The sound insulation member may be provided on the surface 244 located on the opposite side of the retard roller 112 with the sound collection point p1 interposed therebetween. An example of the sound insulating member provided on the surface 244 is a wall portion 211 shown in FIG. By providing a sound insulating member on the surface 244, it is possible to prevent the conveyance sound and separation sound that wrap around the space on the opposite side of the conveyance path 240 across the sound collection point p1 and the space on the opposite side of the retard roller 112 across the sound collection point p1. Propagation can be reduced.

  The sound insulation member may be provided on a surface 245 located on the upstream side of the document conveyance path 240 with respect to the sound collection point p1. An example of the sound insulating member provided on the surface 245 is a wall portion 213 shown in FIG. By providing the sound insulating member on the surface 245, it is possible to reduce propagation of conveyance sound and separation sound that wrap around the space upstream of the document conveyance path 240 from the sound collection point p1.

  The sound insulation member may be provided on the surface 246 located on the downstream side of the document conveyance path 240 with respect to the sound collection point p1. As an example of the sound insulating member provided on the surface 246, a wall portion provided on the downstream side of the document conveyance path with respect to the first microphone 113 a and facing the first microphone 113 a may be formed in the upper housing 102. By providing the sound insulating member on the surface 246, it is possible to reduce propagation of conveyance sound and separation sound that wrap around the space downstream of the document conveyance path 240 from the sound collection point p1.

  In addition, a sound insulation member can also be provided in each of the arbitrary combinations of said surfaces 241-246. For example, the sound insulation member may be provided on both the surfaces 241 and 242. The sound insulation effect can be determined by providing sound insulation members on a plurality of surfaces. Further, for example, the sound insulating member may be provided so as to cover all the surfaces 241 to 246 facing the sound collecting point p1 except for the sound collecting through hole provided on the surface 242. A sound insulation effect can be determined by covering all surfaces facing the sound collection point p1. Similarly, a sound insulation member may be provided for the sound collection point p2.

  Next, the surface facing the retard roller 112 will be described. The surface 250 is a surface located on the opposite side of the conveyance path 240 with the retard roller 112 interposed therebetween. The surfaces 251 and 252 are surfaces positioned on the upstream side and the downstream side of the document conveyance path 240 with respect to the retard roller 112, respectively.

  The sound insulation member may be provided on a surface 250 located on the opposite side of the conveyance path 240 with the retard roller 112 interposed therebetween. An example of the sound insulating member provided on the surface 250 is a roller housing recess 220 shown in FIG. By providing the sound insulating member on the surface 250, it is possible to reduce the propagation of the conveyance sound and the separation sound that go around the space on the opposite side of the conveyance path 240 with the retard roller 112 interposed therebetween.

  The sound insulating members may be provided on the surfaces 251 and 252 located on the upstream side and the downstream side of the document conveyance path 240 with respect to the retard roller 112, respectively. As an example of the sound insulation member provided on the surfaces 251 and 252, the wall portions provided on the upstream side and the downstream side of the conveyance path of the document from the retard roller 112 and facing the retard roller 112 are the upper casing 102 and / or the cover 201. You may form in. Providing the sound insulating members on the surfaces 251 and 252 can reduce the propagation of conveyance sound and separation sound that wrap around the upstream and downstream spaces of the document conveyance path 240 relative to the retard roller 112.

  The sound insulation member may be provided on any combination of all the surfaces 250 to 252 or on all surfaces. The sound insulation effect can be determined by providing sound insulation members on a plurality of surfaces. In addition, a sound insulating member may be provided on a part or all of the surface facing the sound collection points p1 and / or p2, and a sound insulating member may be provided on a part or all of the surface facing the retard roller 112.

  FIG. 13 is a block diagram illustrating a schematic configuration of the document conveying apparatus 100. In addition to the configuration described above, the document conveying apparatus 100 includes a first image A / D conversion unit 540a, a second image A / D conversion unit 540b, a first sound signal output unit 541a, a second sound signal output unit 541b, and a drive. A unit 545, an interface unit 546, a storage unit 547, a central processing unit 550, and the like.

  The first image A / D conversion unit 540a performs analog-digital conversion on the analog image signal output from the first imaging unit 119a to generate digital image data, and outputs the digital image data to the central processing unit 550. Similarly, the second image A / D conversion unit 540b performs analog-to-digital conversion on the analog image signal output from the second imaging unit 119b, generates digital image data, and outputs the digital image data to the central processing unit 550. Hereinafter, these digital image data are referred to as read images.

  The first sound signal output unit 541a includes a first microphone 113a, a first filter unit 542a, a first amplification unit 543a, a first sound A / D conversion unit 544a, and the like. The first filter unit 542a applies a band-pass filter that passes a signal in a predetermined frequency band to the signal output from the first microphone 113a, and outputs the signal to the first amplification unit 543a. The first amplification unit 543a amplifies the signal output from the first filter unit 542a and outputs the amplified signal to the first sound A / D conversion unit 544a. The first sound A / D conversion unit 544a converts the analog signal output from the first amplification unit 543a into a digital first original signal and outputs it to the central processing unit 550.

  The second sound signal output unit 541b includes a second microphone 113b, a second filter unit 542b, a second amplification unit 543b, a second sound A / D conversion unit 544b, and the like. The second filter unit 542b applies a band-pass filter that passes a signal in a predetermined frequency band to the signal output from the second microphone 113b, and outputs the signal to the second amplification unit 543b. The second amplification unit 543b amplifies the signal output from the second filter unit 542b and outputs the amplified signal to the second sound A / D conversion unit 544b. The second sound A / D conversion unit 544b converts the analog signal output from the second amplification unit 543b into a digital second original signal and outputs it to the central processing unit 550.

  The driving unit 545 includes one or a plurality of motors, and rotates the paper feeding roller 111, the retard roller 112, the first conveying roller 116, and the second conveying roller 120 according to a control signal from the central processing unit 550, thereby causing the document to be scanned. Carry out the transfer operation.

  The interface unit 546 has an interface circuit conforming to a serial bus such as USB, for example, and is electrically connected to an information processing device (not shown) (for example, a personal computer, a portable information terminal, etc.) to display a read image and various types of information. Send and receive. Further, a read image may be stored by connecting a flash memory or the like to the interface unit 546.

  The storage unit 547 includes a memory device such as a random access memory (RAM) and a read only memory (ROM), a fixed disk device such as a hard disk, or a portable storage device such as a flexible disk and an optical disk. The storage unit 547 stores computer programs, databases, tables, and the like used for various processes of the document feeder 100. The computer program is stored in a storage unit 547 from a computer-readable portable recording medium such as a CD-ROM (compact disk read only memory) or a DVD-ROM (digital versatile disk read only memory) using a known setup program. May be installed. Further, the storage unit 547 stores the read image.

  Central processing unit 550 includes a CPU (Central Processing Unit) and operates based on a program stored in storage unit 547 in advance. The central processing unit 550 may be configured by a digital signal processor (DSP), a large scale integration (LSI), an application specific integrated circuit (ASIC), a field-programming gate array (FPGA), or the like.

  The central processing unit 550 includes an operation button 106, a first document detection unit 110, a second document detection unit 114, an ultrasonic sensor 115, a third document detection unit 118, a first imaging unit 119a, a second imaging unit 119b, and a first. Connected to the image A / D conversion unit 540a, the second image A / D conversion unit 540b, the first sound signal output unit 541a, the second sound signal output unit 541b, the drive unit 545, the interface unit 546, and the storage unit 547, these Control each part.

  The central processing unit 550 performs drive control of the drive unit 545, document reading control of the imaging unit 119, and the like, and acquires a read image. The central processing unit 550 includes a control unit 551, an image generation unit 552, a sound jam determination unit 553, a position jam determination unit 554, a double feed determination unit 555, and the like. Each of these units is a functional module implemented by software operating on the processor. Each of these units may be configured by an independent integrated circuit, a microprocessor, firmware, and the like.

  The sound jam determination unit 553 performs sound jam determination processing. The sound jam determination unit 553 generates a jam based on the first original signal acquired from the first sound signal output unit 541a and the second original signal acquired from the second sound signal output unit 541b in the sound jam determination process. It is determined whether or not. Hereinafter, a jam in which the sound jam determination unit 553 determines whether or not it occurs based on each original signal may be referred to as a sound jam.

  The position jam determination unit 554 performs position jam determination processing. The position jam determination unit 554 generates a jam based on the second document detection signal acquired from the second document detection unit 114 and the third document detection signal acquired from the third document detection unit 118 in the position jam determination process. Determine whether or not. Hereinafter, a jam in which the position jam determination unit 554 determines whether or not it occurs based on the second document detection signal and the third document detection signal may be referred to as a position jam.

  The double feed determination unit 555 performs a double feed determination process. The double feed determination unit 555 determines whether or not a double feed of the document has occurred in the double feed determination process based on the ultrasonic signal acquired from the ultrasonic sensor 115.

  The control unit 551 determines whether or not an abnormality has occurred in the document conveyance process. The control unit 551 determines that an abnormality has occurred when at least one of a sound jam, a position jam, and a document double feed occurs. When an abnormality occurs in the document conveyance process, the control unit 551 sets the abnormality occurrence flag to ON.

  When the abnormality occurrence flag is ON, the control unit 551 stops the driving unit 545 as an abnormality process to stop the conveyance of the document, and an abnormality is caused by a not-shown speaker, LED (Light Emitting Diode), or the like. Notify the user of the occurrence and set the abnormality occurrence flag to OFF.

  When the abnormality determination flag is not ON, the image generation unit 552 causes the first imaging unit 119a and the second imaging unit 119b to read the conveyed document, and the first image A / D conversion unit 540a and the second image A / D. A read image is acquired via the conversion unit 540b. The central processing unit 550 transmits the acquired read image to an information processing apparatus (not shown) via the interface unit 546. When not connected to the information processing apparatus, the central processing unit 550 stores the acquired read image in the storage unit 547.

  The document conveying apparatus 100 according to the present exemplary embodiment includes a sound insulating member for blocking the conveyance sound and separation sound generated from the nip portion of the paper feed roller 111 and the retard roller 112 from the first microphone 113a and the second microphone 113b. As a result, it becomes difficult to superimpose the carrier sound and the separated sound other than the sound due to the occurrence of the jam on the sound signal collected by the first microphone 113a and the second microphone 113b. As a result, the determination accuracy by the sound jam determination process by the sound jam determination unit 553 using this sound signal is improved.

  In addition, by providing sound insulation members on a plurality of surfaces facing the sound collection portions of the first microphone 113a and the second microphone 113b and the retard roller 112, it is possible to further increase the conveyance sound and separation sound. Furthermore, the sound insulation effect can be further enhanced by covering all surfaces facing the first microphone 113a and / or the second microphone 113b.

DESCRIPTION OF SYMBOLS 100 Document conveying apparatus 101 Lower housing | casing 102 Upper housing | casing 107a Lower guide 107b Upper guide 107c Guide member 108 Frame 109a, 109b Opening 111a, 111b Feed roller 112a, 112b Retard roller 113a 1st microphone 113b 2nd microphone 210 , 211, 212, 213 Wall 220 Roller receiving recess

Claims (6)

A roller pair which is a pair of a feed roller and a separation roller facing each other across the document conveyance path;
A sound collecting unit provided on the same side as one side of the document conveyance path on which any one of the rollers of the roller pair is disposed;
A first sound insulating wall provided between the nip part of the roller pair and the sound collecting part, and provided between the one roller and the sound collecting part; and the document conveying path and the sound collecting part; A sound insulation member including a second sound insulation wall provided between and having an opening ;
A sound signal output unit that outputs a sound signal according to the sound collected by the sound collection unit through the opening ;
A sound jam determination unit that determines whether or not a jam has occurred based on the sound signal ,
The opening is provided on the downstream side in the document transport direction from the position of the sound collection unit.
Document feeder which is characterized a call. The document conveying apparatus according to claim 1 , further comprising a sound insulating member provided on the opposite side of the document conveying path with the one roller interposed therebetween, and facing the one roller. 3. The document conveying device according to claim 1, further comprising a sound insulating member provided on a downstream side and / or an upstream side of the document conveying path with respect to the one roller and facing the one roller. Document feeder according to any one of claims 1 to 3, further comprising a sound insulating member that faces the sound collecting portion provided on the opposite side of the document transport path across the sound collecting unit. 3. The document conveying apparatus according to claim 1, further comprising a sound insulating member provided on a downstream side and / or an upstream side of the document conveying path with respect to the sound collecting unit and facing the sound collecting unit. Document feeder according to any one of claims 1 to 3, further comprising a sound insulating member that faces the sound collecting portion is provided opposite the one of the rollers across the sound collecting unit .

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