US20240217762A1 - Medium conveying device, medium feeding method, and control program - Google Patents

Medium conveying device, medium feeding method, and control program Download PDF

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Publication number
US20240217762A1
US20240217762A1 US18/604,146 US202418604146A US2024217762A1 US 20240217762 A1 US20240217762 A1 US 20240217762A1 US 202418604146 A US202418604146 A US 202418604146A US 2024217762 A1 US2024217762 A1 US 2024217762A1
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United States
Prior art keywords
medium
roller
motor
feed roller
separation roller
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Pending
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US18/604,146
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English (en)
Inventor
Kiichiro Shimosaka
Syuichi MORIKAWA
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PFU Ltd
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PFU Ltd
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Assigned to PFU LIMITED reassignment PFU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORIKAWA, Syuichi, SHIMOSAKA, KIICHIRO
Publication of US20240217762A1 publication Critical patent/US20240217762A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0607—Rollers or like rotary separators cooperating with means for automatically separating the pile from roller or rotary separator after a separation step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/063—Rollers or like rotary separators separating from the bottom of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0669—Driving devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0676—Rollers or like rotary separators with two or more separator rollers in the feeding direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0684—Rollers or like rotary separators on moving support, e.g. pivoting, for bringing the roller or like rotary separator into contact with the pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/66—Article guides or smoothers, e.g. movable in operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/32—Torque e.g. braking torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/12—Single-function printing machines, typically table-top machines

Definitions

  • the present disclosure relates to a medium conveying apparatus, a medium feeding method, and a control program.
  • a medium conveying apparatus such as a scanner that sequentially feed and image a plurality of media while separating the media
  • a document separation apparatus including a feed roller, a reverse roller, a lever to detect a document on a document table, and a reading motor to rotate the reverse roller, based on detection information of the lever, is known.
  • the reading motor detects a document on the document table by the lever
  • the document separation apparatus rotates the reverse roller without rotating the feed roller.
  • a feeding apparatus including a supporting part that supports a medium set on a setting part and, when feeding a medium by a feed roller, moves such that the medium comes into contact with the feed roller is known.
  • the feeding apparatus drives the feed roller before movement of the supporting part.
  • a medium conveying apparatus includes a feed roller to feed a medium, a separation roller located to face the feed roller, a regulating guide provided to be movable between a first position where contact of the medium with the feed roller and the separation roller is regulated and a second position where contact of the medium with the feed roller and the separation roller is not regulated, and a processor to control the feed roller, the separation roller, and the regulating guide.
  • processor controls the feed roller, the separation roller, and the regulating guide such that the feed roller feeds the medium after the regulating guide moves from the first position toward the second position and the separation roller contacts the medium.
  • a method for feeding a medium includes, when feeding of a medium is started, controlling a feed roller for feeding a medium, a separation roller located to face the feed roller, and a regulating guide provided to be movable between a first position where contact of the medium with the feed roller and the separation roller is regulated and a second position where contact of the medium with the feed roller and the separation roller is not regulated such that the feed roller feeds the medium after the regulating guide moves from the first position toward the second position and the separation roller contacts the medium
  • FIG. 5 is a schematic diagram for illustrating a holding part.
  • FIG. 7 is a diagram illustrating a schematic configuration of a storage device and a processing circuit.
  • FIG. 11 is a flowchart illustrating an operation example of multi feed determination process.
  • FIG. 13 is a diagram for illustrating a conveyance path inside another medium conveying apparatus.
  • FIG. 14 is a diagram illustrating a schematic configuration of another processing circuit.
  • FIG. 2 is a diagram illustrating a conveyance path inside the medium conveying apparatus.
  • Each of the numbers of the feed roller 115 , the separation roller 116 , the conveyance roller 119 , the first facing roller 120 , the ejection roller 123 , and/or the second facing roller 124 is not limited to one and may be more than one. In that case, a plurality of feed rollers 115 , separation rollers 116 , conveyance rollers 119 , first facing rollers 120 , ejection rollers 123 , and/or second facing rollers 124 are respectively spaced in the width direction A 2 perpendicular to the medium conveying direction.
  • the first medium sensor 111 is located on the upstream side of the feed roller 115 and the separation roller 116 .
  • the first medium sensor 111 includes a contact detection sensor and detects whether a medium is placed on the loading tray 103 .
  • the first medium sensor 111 generates and outputs a medium signal the signal value of which varies between a state in which a medium is placed on the loading tray 103 and a state in which a medium is not placed.
  • the first medium sensor 111 is not limited to a contact detection sensor and any other sensor that can detect the presence of a medium, such as a light detection sensor, may be used as the first medium sensor 111 .
  • the second medium sensor 117 When a medium is present at a position facing the second medium sensor 117 , light emitted from the light emitter is blocked by the medium, and therefore the light receiver does not detect the light emitted from the light emitter.
  • the second medium sensor 117 generates and outputs a second medium signal, the signal value of which varies between a state in which a medium is present at the position of the second medium sensor 117 and a state in which a medium is not present, based on the intensity of light received by the light receiver.
  • a reflection member such as a mirror may be used in place of the light guide. Further, the light emitter and the light receiver may be provided to face each other with the medium conveyance path in between. Further, the second medium sensor 117 may detect existence of a medium by, for example, a contact detection sensor to pass predetermined current when a medium is in contact or when a medium is not in contact.
  • the ultrasonic receiver 118 b receives an ultrasonic wave transmitted by the ultrasonic transmitter 118 a and passing through a medium and generates and outputs an ultrasonic signal being an electric signal based on the received ultrasonic wave.
  • an ultrasonic wave passing through the media is attenuated by an air layer between the media conveyed in a stacked manner. Accordingly, the medium conveying apparatus 100 can detect multi feed of media, based on the ultrasonic signal.
  • Only one of the first imaging device 122 a and the second imaging device 122 b may be located and only one side of a medium may be read in the medium conveying apparatus 100 .
  • a medium is fed between the conveyance roller 119 and the first facing roller 120 while being guided by the lower guide 101 a and the upper guide 102 a .
  • the medium is fed between the first imaging device 122 a and the second imaging device 122 b by the conveyance roller 119 and the first facing roller 120 rotating in directions of an arrow A 6 and an arrow A 7 , respectively.
  • the medium read by the imaging device 122 is ejected into the ejection tray 104 by the ejection roller 123 and the second facing roller 124 rotating in directions of an arrow A 8 and an arrow A 9 , respectively.
  • the medium conveying apparatus 100 includes a first motor 131 , a second motor 132 , and a third motor 133 as driving sources of the rollers.
  • the second motor 132 is provided in the upper housing 102 separately from the first motor 131 , is connected to the separation roller 116 through a second transmission mechanism 132 a , and drives the separation roller 116 .
  • the second motor 132 generates a driving force for driving the separation roller 116 in accordance with a control signal from the processing circuit.
  • the second transmission mechanism 132 a includes one or a plurality of pulleys, belts, gears, etc., provided between the second motor 132 and a shaft 116 a being the rotation axis of the separation roller 116 .
  • the second transmission mechanism 132 a transmits the driving force generated by the second motor 132 to the separation roller 116 .
  • the second motor 132 separates, feeds, and conveys a medium by rotating the separation roller 116 .
  • the second motor 132 may be located in the lower housing 101 .
  • the third motor 133 is provided in the upper housing 102 separately from the first motor 131 and the second motor 132 .
  • the third motor 133 is connected to the conveyance roller 119 , the ejection roller 123 , and the cam member 113 through a third transmission mechanism 133 a and drives the conveyance roller 119 , the ejection roller 123 , and the cam member 113 .
  • the third motor 133 generates a driving force for driving the conveyance roller 119 , the ejection roller 123 , and the cam member 113 in accordance with a control signal from the processing circuit.
  • the third transmission mechanism 133 a includes one or a plurality of pulleys, belts, gears, etc., provided between the third motor 133 , and a shaft 119 a being the rotation axis of the conveyance roller 119 , a shaft 123 a being the rotation axis of the ejection roller 123 and the rotation axis 113 a of the cam member 113 .
  • the third transmission mechanism 133 a transmits the driving force generated by the third motor 133 to the conveyance roller 119 , the ejection roller 123 , and the cam member 113 .
  • the third motor 133 conveys and ejects a medium by rotating the conveyance roller 119 and the ejection roller 123 .
  • the conveyance roller 119 and the ejection roller 123 are provided to be driven by the third motor 133 .
  • the third motor 133 moves the regulating guide 112 in contact with the cam member 113 by rotating the cam member 113 .
  • the third motor 133 may be located in the lower housing 101 .
  • a motor for driving the conveyance roller 119 and the ejection roller 123 and a motor for moving the regulating guide 112 may be common. Consequently, the medium conveying apparatus 100 can reduce the cost and weight of the apparatus by reducing the number of motors.
  • the first facing roller 120 is a driven roller driven to rotate by the conveyance roller 119
  • the second facing roller 124 is a driven roller driven to rotate by the ejection roller 123 .
  • the flap 114 is a stopper for preventing the medium M 1 from entering a nip part of the feed roller 115 and the separation roller 116 before medium feeding.
  • the flap 114 is located at a position facing the regulating guide 112 in the medium conveying direction A 1 .
  • the flap 114 is swingably provided in the upper housing 102 and, when feeding of the medium M 1 is not executed, the flap 114 is engaged with the regulating guide 112 located at the set position and prevents entry of the medium M 1 into the nip part of the feed roller 115 and the separation roller 116 .
  • the medium conveying apparatus 100 further includes an interface device 135 , a storage device 140 , a processing circuit 150 , etc.
  • the processing circuit 150 operates in accordance with a program previously stored in the storage device 140 .
  • the processing circuit is a central processing unit (CPU).
  • Examples of the processing circuit 150 that may also be used include a digital signal processor (DSP), a large scale integration (LSI), an application specific integrated circuit (ASIC), and a field-programmable gate array (FPGA).
  • DSP digital signal processor
  • LSI large scale integration
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • the processing circuit 150 is connected to the operation device 105 , the display device 106 , the first medium sensor 111 , the second medium sensor 117 , the ultrasonic sensor 118 , the third medium sensor 121 , the imaging device 122 , the first motor 131 , the second motor 132 , the third motor 133 , the interface device 135 , the storage device 140 , etc., and controls the components.
  • the processing circuit 150 performs drive control of each motor, imaging control of the imaging device 122 , etc., based on each medium signal received from each medium sensor.
  • a control program 141 As illustrated in FIG. 7 , a control program 141 , a determination program 142 , etc., are stored in the storage device 140 .
  • Each program is a functional module implemented by software operating on the processor.
  • the processing circuit 150 reads each program stored in the storage device 140 and operates in accordance with the read program. Consequently, the processing circuit 150 functions as a control module 151 , and a determination module 152 .
  • a graph G 11 illustrates changes in the speed of the feed roller 115
  • a graph G 12 illustrates changes in the speed of the separation roller 116
  • a graph G 13 illustrates changes in the speed of the conveyance roller 119 . Since the speeds of the first facing roller 120 , the ejection roller 123 , and the second facing roller 124 change similarly to the speed of the conveyance roller 119 , changes in the speed of the conveyance roller 119 will be described below as a representative.
  • the horizontal axis of each of the graphs G 11 to G 13 indicates time, and the vertical axis of each of the graphs G 11 to G 13 indicates speed.
  • the front edge of the medium group M 1 is arranged such that a medium closer to the top is placed further on the upstream side by the separation roller 116 rotating in the direction opposite to the medium feeding direction. Consequently, occurrence of multi feed of media due to a plurality of media entering the nip part of the feed roller 115 and the separation roller 116 together when rotation of the feed roller 115 starts is suppressed.
  • the control module 151 may wait for a first predetermined time after driving the third motor 133 in step S 103 before driving the first motor 131 in step S 105 .
  • the first predetermined time is set to the time required for the front edge of a medium regulated by the flap 114 to come into contact with the separation roller 116 rotating in the direction opposite to the medium feeding direction after the third motor 133 is driven. Consequently, the control module 151 can reliably apply a separating force exerted by the separation roller 116 to a medium group before a feeding force exerted by the feed roller 115 is applied and medium conveying apparatus can reliably suppress occurrence of multi feed of media.
  • control module 151 waits until the front edge of the conveyed medium passes the position of the second medium sensor 117 (step S 106 ).
  • the control module 151 periodically acquires the second medium signal from the second medium sensor 117 , and determines that the front edge of the medium has passed the position of the second medium sensor 117 when the signal value of the second medium signal changes from a value indicating that a medium does not exist to a value indicating that a medium exists.
  • a time T 4 denotes the time when the signal value of the second medium signal changes from L to H, i.e., when the front edge of the medium has passed the position of the second medium sensor 117 .
  • rotation of the separation roller 116 is stopped when the front edge of the medium passes the position of the second medium sensor 117 .
  • the control module 151 stopping the separation roller 116 the medium conveying apparatus 100 can reduce the amount of power consumption and the apparatus temperature while suitably separating media.
  • control module 151 waits until the front edge of the conveyed medium passes the position of the conveyance roller 119 (step S 108 ).
  • the control module 151 periodically acquires the third medium signal from the third medium sensor 121 , and determines that the front edge of the medium has passed the position of the third medium sensor 121 when the signal value of the third medium signal changes from a value indicating that a medium does not exist to a value indicating that a medium exists.
  • the control module 151 determines that the front edge of the medium has passed the position of the conveyance roller 119 when the front edge of the medium passes the position of the third medium sensor 121 .
  • control module 151 controls the first motor 131 to stop the feed roller 115 (step S 108 ).
  • a time T 5 denotes the time when the signal value of the third medium signal changes from L to H, i.e., when the front edge of the medium has passed the position of the third medium sensor 121 .
  • the control module 151 stops the feed roller 115 . Consequently, from this point, the medium is conveyed by the conveyance roller 119 , and the feed roller 115 is rotated by the medium being conveyed.
  • the control module 151 stopping the feed roller 115 the medium conveying apparatus 100 can suppress occurrence of jamming of the medium due to the medium being pushed by the feed roller 115 and being bent between the feed roller 115 and the conveyance roller 119 .
  • control module 151 causes the imaging device 122 to start imaging of the medium (step S 110 ).
  • control module 151 waits until the rear edge of the conveyed medium passes the position of the second medium sensor 117 (step S 111 ).
  • the control module 151 periodically acquires the second medium signal from the second medium sensor 117 , and determines that the rear edge of the medium has passed the position of the second medium sensor 117 when the signal value of the second medium signal changes from a value indicating that a medium exists to a value indicating that a medium does not exist.
  • control module 151 determines whether a medium remains on the loading tray 103 , based on the medium signal received from the first medium sensor 111 (step S 112 ).
  • control module 151 controls the second motor 132 to re-rotate the separation roller 116 in the direction opposite to the medium feeding direction (in the direction of the arrow A 5 in FIG. 2 ) (step S 113 ).
  • control module 151 controls the first motor 131 to re-rotate the feed roller 115 in the medium feeding direction (in the direction of the arrow A 4 in FIG. 2 ) to feed a succeeding medium (step S 114 ).
  • a time T 6 denotes the time when the signal value of the second medium signal changes from H to L, i.e., when the rear edge of the medium has passed the position of the second medium sensor 117 .
  • the control module 151 starts driving of the second motor 132 and the first motor 131 in this order, and therefore, the separation roller 116 and the feed roller 115 sequentially start rotation at times T 6 and T 7 , respectively.
  • the control module 151 can apply a separating force exerted by the separation roller 116 on the medium group remaining on the loading tray 103 before a feeding force exerted by the feed roller 115 is applied. Accordingly, before entering the nip part of the feed roller 115 and the separation roller 116 , the front edge of the medium group remaining on the loading tray 103 is arranged such that a medium closer to the top is placed further on the upstream side by the separation roller 116 rotating in the direction opposite to the medium feeding direction. Therefore, occurrence of multi feed of media due to a plurality of media entering the nip part of the feed roller 115 and the separation roller 116 together when rotation of the feed roller 115 starts is suppressed.
  • the separation roller 116 By the separation roller 116 starting rotation before the feed roller 115 starts rotation, the separation roller 116 being driven by the feed roller 115 before the start of rotation is suppressed, and the separation roller 116 can satisfactorily separate media.
  • control module 151 controls the first motor 131 and the second motor 132 such that the feed roller 115 rotates after the separation roller 116 rotates. Consequently, the control module 151 can suppress occurrence of multi feed of media when feeding of a second or subsequent medium is started.
  • control module 151 acquires an input image from the imaging device 122 and outputs the acquired input image by transmitting the image to the information processing apparatus through the interface device 135 (step S 116 ).
  • control module 151 returns the processing to step S 106 and repeats the processing in and after step S 106 on a succeeding medium.
  • the control module 151 waits until the front edge of the succeeding medium passes the position of the second medium sensor 117 (a time T 8 in FIG. 10 ) in step S 106 and controls the second motor 132 to stop the separation roller 116 in step S 107 .
  • the control module 151 waits until the front edge of the succeeding medium passes the position of the conveyance roller 119 (a time T 9 in FIG. 10 ) in step S 108 and controls the first motor 131 to stop the feed roller 115 in step S 109 .
  • control module 151 waits until the rear edge of the conveyed medium passes the imaging position of the imaging device 122 , similarly to the processing in step S 115 (step S 117 ).
  • control module 151 acquires an input image from the imaging device 122 and outputs the acquired input image by transmitting the image to the information processing apparatus through the interface device 135 (step S 118 ).
  • control module 151 waits until the rear edge of the conveyed medium passes the position of the ejection roller 123 (step S 119 ).
  • the control module 151 determines that the rear edge of the medium has passed the position of the ejection roller 123 when a fourth predetermined time elapses after the rear edge of the medium passes the position of the third medium sensor 121 .
  • the fourth predetermined time is set to a value acquired by adding a margin to the time required for a medium to move from the position of the third medium sensor 121 to the position of the ejection roller 123 .
  • control module 151 controls the third motor 133 to stop the conveyance roller 119 , the first facing roller 120 , the ejection roller 123 , and/or the second facing roller 124 (step S 120 ).
  • control module 151 controls (counterrotates) the third motor 133 to move the regulating guide 112 in a direction opposite to the arrow A 12 in FIG. 3 , i.e., from the release position to the set position by rotating the cam member 113 in a direction opposite to the arrow A 11 in FIG. 3 (step S 121 ). Consequently, the regulating guide 112 is located at the set position, and the flap 114 is engaged with the regulating guide 112 located at the set position and is located at a position where the medium is prevented from entering the nip part of the feed roller 115 and the separation roller 116 (the position illustrated in FIG. 3 ).
  • the conveyance roller 119 , the first facing roller 120 , the ejection roller 123 , and/or the second facing roller 124 rotate in directions opposite to the arrows A 6 , A 7 , A 8 , and A 9 in FIG. 2 , respectively; however, since no medium exists in the medium conveyance path, no issue occurs.
  • control module 151 controls the third motor 133 to stop the cam member 113 (step S 122 ).
  • control module 151 controls the first motor 131 or the second motor 132 to rotate the feed roller 115 or the separation roller 116 (step S 123 ).
  • the control module 151 controls the first motor 131 or the second motor 132 to rotate either one or both of the feed roller 115 and the separation roller 116 in the medium feeding direction.
  • the control module 151 rotating either one of the feed roller 115 and the separation roller 116 , the other roller can be driven to rotate.
  • the control module 151 controls the first motor 131 or the second motor 132 to rotate the feed roller 115 or the separation roller 116 while the regulating guide 112 is located at the set position.
  • the control module 151 rotates the feed roller 115 or the separation roller 116 to move substances adhered to the feed roller 115 or the separation roller 116 .
  • substances adhered from a fed medium to the feed roller 115 or the separation roller 116 falls from the feed roller 115 or the separation roller 116 and is held by the holding part 134 .
  • by rotating the feed roller 115 and the separation roller 116 substances adhered to each roller or substances gathered around each roller area are spread. A contact area between the medium and a rubber part of each roller is secured, and the medium conveying apparatus 100 can suppress decline in a medium feeding force and a medium separating force.
  • control module 151 controls the first motor 131 or the second motor 132 to stop the feed roller 115 or the separation roller 116 (step S 124 ) and ends the series of steps.
  • the processing in steps S 103 , S 104 , and S 105 may be executed in any order.
  • the processing in steps S 113 and S 114 may be executed in any order.
  • the processing in steps S 123 and S 124 may be executed at any timing when a medium is not fed. Alternatively, the processing in steps S 123 and S 124 may be omitted.
  • FIG. 11 is a flowchart illustrating an operation example of multi feed determination process in the medium conveying apparatus.
  • FIG. 11 An operation example of the multi feed determination process in the medium conveying apparatus 100 will be described below referring to the flowchart illustrated in FIG. 11 .
  • the operation flow described below is executed mainly by the processing circuit 150 in accordance with a program prestored in the storage device 140 in cooperation with each component in the medium conveying apparatus 100 .
  • the operation flow illustrated in FIG. 11 is periodically executed during medium conveyance.
  • the determination module 152 acquires an ultrasonic signal from the ultrasonic sensor 118 (step S 201 ).
  • the determination module 152 determines whether multi feed of media has occurred, based on the acquired ultrasonic signal (step S 202 ).
  • the determination module 152 determines that multi feed of media has not occurred when the signal value of the ultrasonic signal is greater than or equal to a multi feed threshold value and determines that multi feed of media has occurred when the signal value of the ultrasonic signal is less than the multi feed threshold value.
  • the multi feed threshold value is set to a value between a signal value of the ultrasonic signal when a sheet of paper is conveyed and a signal value of the ultrasonic signal when multi feed of papers occurs.
  • control module 151 temporarily stops the medium reading process (step S 203 ).
  • control module 151 controls the second motor 132 to re-rotate the separation roller 116 in the direction opposite to the medium feeding direction (in the direction of the arrow A 5 in FIG. 2 ) (step S 205 ).
  • control module 151 returns the multi-fed media to the loading tray 103 by controlling (counterrotating) the first motor 131 to rotate the feed roller 115 in a direction opposite to the medium feeding direction (in a direction opposite to the arrow A 4 in FIG. 2 ) (step S 206 ).
  • the control module 151 controls the first motor 131 and the second motor 132 such that the circumferential speed of the shaft 115 a being the rotation axis of the feed roller 115 is greater than the circumferential speed of the outer peripheral surface 115 b of the feed roller 115 driven by the separation roller 116 .
  • the control module 151 controls the first motor 131 and the second motor 132 to return the media to the loading tray 103 .
  • the control module 151 controls the first motor 131 and the second motor 132 to rotate the feed roller 115 after rotating the separation roller 116 .
  • the control module 151 controls the first motor 131 and the second motor 132 such that the circumferential speed of the shaft 115 a being the rotation axis of the feed roller 115 is greater than the circumferential speed of the outer peripheral surface 115 b of the feed roller 115 driven by the separation roller 116 .
  • FIG. 12 is a schematic diagram for illustrating an operation of returning multi-fed media M 2 to the loading tray.
  • FIG. 12 is a schematic diagram of the feed roller and the separation roller viewed from the side when multi feed occurs.
  • the limit value of the torque limiter 116 c provided on the shaft 116 a of the separation roller 116 is set to a value allowing transmission of a turning force through the torque limiter 116 c when there are a plurality of media.
  • the shaft 115 a being the rotation axis of the feed roller 115 is rotated in a direction A 21 opposite to the medium feeding direction
  • the outer peripheral surface 115 b of the feed roller 115 does not rotate according to the driving force from the first motor 131 due to the working of the one-way clutch 115 c .
  • the outer peripheral surface 115 b of the feed roller 115 is driven to rotate by the separation roller 116 in a direction A 22 opposite to the medium feeding direction.
  • the medium conveying apparatus 100 can return all of the plurality of media M 2 to the loading tray 103 by counterrotating the first motor 131 .
  • the shaft 116 a of the separation roller 116 is provided with the torque limiter 116 c , and, depending on the placement position of the torque limiter 116 c , a backlash component to which a driving force is not transmitted may exist between the shaft 116 a and the separation roller 116 . Therefore, assuming that the shaft 115 a of the feed roller 115 is rotated before the separation roller 116 , the shaft 115 a of the feed roller 115 may start rotation in a state of the separation roller 116 not being locked.
  • the control module 151 may wait for a fifth predetermined time after re-rotating the separation roller 116 in step S 205 before counterrotating the feed roller 115 in step S 206 .
  • the fifth predetermined time is set to the time required for the separation roller 116 to rotate by a backlash component between the separation roller 116 and the shaft 116 a . Consequently, the control module 151 can start rotation of the shaft 115 a of the feed roller 115 after the backlash component between the separation roller 116 and the shaft 116 a reliably disappears and can more reliably suppress occurrence of a wrinkle in a medium.
  • control module 151 controls the first motor 131 and the second motor 132 to stop the feed roller 115 and the separation roller 116 (step S 208 ).
  • the control module 151 sets the moving speed of the outer peripheral surface 115 b of the feed roller 115 to a speed greater than the moving speed of the outer peripheral surface 116 b of the separation roller 116 . Consequently, the control module 151 can cause the medium being in contact with the feed roller 115 and being positioned at the bottom to catch up with the medium being in contact with the separation roller 116 and being positioned at the top. Accordingly, the control module 151 can synchronize timings for returning the respective multi-fed media to the loading tray 103 and therefore enables early completion of recovery of the media.
  • the medium conveying apparatus 100 may not execute the multi feed determination process.
  • the first motor 131 for driving the feed roller 115 the second motor 132 for driving the separation roller 116 , and the third motor 133 for driving the regulating guide 112 are separately provided in the medium conveying apparatus 100 .
  • the medium conveying apparatus 100 controls the first motor 131 , the second motor 132 , and the third motor 133 such that the feed roller 115 rotates after the separation roller 116 in a rotating state contacts the medium. Consequently, the medium conveying apparatus 100 can satisfactorily arrange the front edge of a medium group placed on the loading tray 103 by the separation roller 116 and can more satisfactorily separate media.
  • the first motor 131 for driving the feed roller 115 and the second motor 132 for driving the separation roller 116 are separately provided in the medium conveying apparatus 100 .
  • the medium conveying apparatus 100 controls the first motor 131 and the second motor 132 to rotate the shaft 115 a of the feed roller 115 after rotating the separation roller 116 . Consequently, the medium conveying apparatus 100 can stably return multi-fed media to the loading tray 103 and can more suitably restore media when multi feed of the media occurs.
  • the medium conveying apparatus 100 can stably separate media and can stably return multi-fed media to the loading tray 103 regardless of the number of media conveyed together or the type of conveyed medium. Further, when returning multi-fed media to the loading tray 103 , the medium conveying apparatus 100 can suppress occurrence of a jam of a medium.
  • FIG. 13 is a diagram for illustrating a conveyance path inside a medium conveying apparatus according to another embodiment.
  • the second motor 232 and the second transmission mechanism 232 a have structures similar to those of the second motor 132 and the second transmission mechanism 132 a , respectively. However, the second motor 232 is connected to the separation roller 116 and the cam member 113 through the second transmission mechanism 232 a and drives the separation roller 116 and the cam member 113 . The second motor 232 generates a driving force for driving the separation roller 116 and the cam member 113 in accordance with a control signal from the processing circuit 150 .

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US20190367307A1 (en) * 2018-05-31 2019-12-05 Seiko Epson Corporation Medium feeding device

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JP4820314B2 (ja) * 2007-02-27 2011-11-24 株式会社Ｐｆｕ 給紙装置
JP2012051720A (ja) * 2010-09-03 2012-03-15 Canon Electronics Inc シート給送装置
JP6016021B2 (ja) 2012-11-20 2016-10-26 株式会社リコー 給紙装置、及び、画像形成装置
JP2017178601A (ja) * 2016-03-31 2017-10-05 ブラザー工業株式会社 搬送装置
JP6910860B2 (ja) * 2017-06-14 2021-07-28 キヤノン電子株式会社 シート搬送装置、及び画像読取装置
JP7147421B2 (ja) 2017-12-26 2022-10-05 セイコーエプソン株式会社 媒体給送装置及び画像読取装置
WO2023145023A1 (ja) * 2022-01-28 2023-08-03 株式会社Pfu 媒体搬送装置、媒体給送方法及び制御プログラム

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US20140061998A1 (en) * 2012-08-31 2014-03-06 Pfu Limited Paper conveying apparatus
US20180002124A1 (en) * 2016-06-29 2018-01-04 Seiko Epson Corporation Feeder, image reading apparatus and recording apparatus
US20190367307A1 (en) * 2018-05-31 2019-12-05 Seiko Epson Corporation Medium feeding device

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