US20110079953A1 - Double feeding detection apparatus, auto sheet feeder and double feed detection method - Google Patents

Double feeding detection apparatus, auto sheet feeder and double feed detection method Download PDF

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Publication number
US20110079953A1
US20110079953A1 US12/874,966 US87496610A US2011079953A1 US 20110079953 A1 US20110079953 A1 US 20110079953A1 US 87496610 A US87496610 A US 87496610A US 2011079953 A1 US2011079953 A1 US 2011079953A1
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US
United States
Prior art keywords
sheet
signal
ultrasonic
section
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/874,966
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English (en)
Inventor
Mitsunori Ishii
Akihito Tokutsu
Seiji Iino
Masakazu Iwamoto
Shinichi MIYAKAWA
Osamu Kitazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Tec Corp
Original Assignee
Toshiba Corp
Toshiba Tec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Tec Corp filed Critical Toshiba Corp
Priority to US12/874,966 priority Critical patent/US20110079953A1/en
Assigned to KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIYAKAWA, SHINICHI, IINO, SEIJI, ISHII, MITSUNORI, IWAMOTO, MASAKAZU, KITAZAWA, OSAMU, TOKUTSU, AKIHITO
Priority to JP2010204404A priority patent/JP5539130B2/ja
Publication of US20110079953A1 publication Critical patent/US20110079953A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B65H2511/524—Multiple articles, e.g. double feed
    • 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
    • B65H2515/60—Optical characteristics, e.g. colour, light
    • 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
    • B65H2515/82—Sound; Noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B65H2553/412—Photoelectric detectors in barrier arrangements, i.e. emitter facing a receptor element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1912—Banknotes, bills and cheques or the like
    • 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
    • B65H2801/06—Office-type machines, e.g. photocopiers

Definitions

  • the present invention relates to a double feed detection apparatus, an auto sheet feeder and a double feed detection method.
  • FIG. 10 and FIG. 11 are views showing levels of ultrasonic waves passing through sheets, which are detected by this related art.
  • FIG. 12 is a view showing an ultrasonic wave irradiation direction when the levels shown in FIG. 10 are obtained
  • FIG. 13 is a view showing an ultrasonic wave irradiation direction when the levels shown in FIG. 11 are obtained.
  • the double feed when the width of a double feed portion is as narrow as 3 mm, the double feed can not be detected since the level is low as in FIG. 10 , or the double feed can not be detected at high accuracy since the ultrasonic wave passes through a gap between the sheets and its level becomes abruptly high as in FIG. 11 .
  • FIG. 1 is a block diagram showing a structure of a double feed detection apparatus.
  • FIG. 2 is a view showing an arrangement relation of a first ultrasonic element and a second ultrasonic element with respect to a conveyance direction of a sheet.
  • FIG. 3 is a view seen in an arrow A in FIG. 2 .
  • FIG. 4 is a view in which widths of detectable double feed portions are compared.
  • FIG. 5 is a view showing detection levels of transmitted ultrasonic waves by the double feed detection apparatus.
  • FIG. 6 is a block diagram showing a structure of the double feed detection apparatus.
  • FIG. 7 is a view showing a case where an angle ⁇ 1 shown in FIG. 3 becomes an angle ⁇ 2 which is 90°.
  • FIG. 8 is a view showing a structure of an auto sheet feeder including the double feed detection apparatus.
  • FIG. 9 is a views showing the structure of the auto sheet feeder.
  • FIG. 10 is a view showing levels of ultrasonic waves passing through sheets, which are detected by the related art.
  • FIG. 11 is a view showing levels of ultrasonic waves passing through sheets, which are detected by the related art.
  • FIG. 12 is a view showing an irradiation direction of an ultrasonic wave passing through sheets, which is detected by the related art.
  • FIG. 13 is a view showing the irradiation direction of the ultrasonic wave passing through sheets, which is detected by the related art.
  • a double feed detection apparatus includes a control section to generate a control signal, a transmission signal generation section to generate a transmission signal from the control signal of the control section, a transmission amplifying section to amplify the transmission signal, a first element to output an amplified signal to a sheet in a direction perpendicular to a conveyance direction of the sheet, a second element to receive the signal of the first element passing through the sheet, a reception amplifying section to amplify a received signal, and an A/D converter to convert the received signal as the amplified analog signal into a digital signal and to output it to the control section.
  • An auto sheet feeder includes a paper feed tray on which documents to be read are placed, a pickup roller to take out a sheet one by one from the paper feed tray and to deliver it to a conveyance mechanism, the conveyance mechanism which includes an outside conveyance path and an inside conveyance path, receives the sheet from the pickup roller and conveys it, a front surface read section to read a front surface of the sheet, a rear surface read section to read a rear surface of the sheet, a storage tray on which the read sheet is stacked, a control section to generate a control signal, a transmission signal generation section to generate a transmission signal from the control signal of the control section, a transmission amplifying section to amplify the transmission signal, a first element to output an amplified signal to the sheet in a direction perpendicular to a conveyance direction of the sheet, a second element to receive the signal of the first element passing through the sheet, a reception amplifying section to amplify a received signal, and an A/D converter to convert the received signal as the amplified
  • a double feed detection method includes generating a control signal by a control section, generating a transmission signal from the control signal by a transmission signal generation section, amplifying the transmission signal by a transmission amplifying section, outputting an amplified signal to a sheet in a direction perpendicular to a conveyance direction of the sheet by a first element, receiving the signal of the first element passing through the sheet by a second element, amplifying a received signal by a reception amplifying section, and converting the received signal as the amplified analog signal into a digital signal by an A/D converter and outputting it to the control section.
  • FIG. 1 is a block diagram showing a structure of a double feed detection apparatus of an embodiment.
  • the double feed detection apparatus includes a CPU 101 as a control section, a transmission signal generation section 102 to generate a transmission signal from the control signal of the control section, a transmission amplifying section 103 to amplify a transmission signal, a changeover switch 104 to Switch between an output destination and an input destination, a first ultrasonic element 10 A as a first element to transmit and receive an ultrasonic wave, a second ultrasonic element 10 B as a second element, a reception amplifying section 105 to amplify a received signal; an A/D converter 106 to convert an analog signal into a digital signal, and a storage device 107 as a memory such as a ROM or a RAM.
  • the CPU 101 generates a signal to control transmission and outputs it to the transmission signal generation section 102 .
  • the transmission signal generation section 102 converts the control signal from the CPU into a transmission signal to drive an element and outputs it to the transmission amplifying section 103 .
  • the transmission amplifying section 103 amplifies the input signal and outputs it to the first ultrasonic element 10 A through the changeover switch 104 .
  • the first ultrasonic element 10 A irradiates an ultrasonic wave to a sheet.
  • the second ultrasonic element 10 B receives the ultrasonic wave passing through the sheet, converts it into an electric signal, and outputs it to the reception amplifying section 105 through the changeover switch 104 .
  • the reception amplifying section 105 amplifies the input signal and outputs it to the A/D converter 106 .
  • the A/D converter 106 converts the input analog signal into a digital signal and outputs it to the CPU 101 .
  • the changeover switch 104 changes a connection relation of the first ultrasonic element 10 A and the second ultrasonic element 10 B with respect to the transmission Amplifying section 103 and the reception amplifying section 105 .
  • the changeover switch 104 connects the second ultrasonic element 10 B to the reception amplifying section 105 .
  • the changeover switch connects the first ultrasonic element 10 A to the reception amplifying section 105 .
  • the output side element to irradiate the ultrasonic wave and the reception side element are periodically interchanged with each other, heat generation of the first ultrasonic element 10 A and the second ultrasonic element 108 are dispersed to the two elements.
  • the output can be increased and the life of the element can be extended.
  • the storage device 107 stores a threshold for a level.
  • the CPU 101 determines that when the level of the input signal is lower than the threshold read from the storage device 107 , the sheet is doubly fed.
  • FIG. 2 is a view showing the arrangement relation of the first ultrasonic element 10 A and the second ultrasonic element 108 with respect to the conveyance direction of the sheet.
  • FIG. 3 is a view seen in an arrow A in FIG. 2 .
  • the double feed detection apparatus includes the first ultrasonic element 10 A at a front surface side of a sheet P 1 , P 2 , and includes the second ultrasonic element 108 at a rear surface side of the sheet P 1 , P 2 and in front of the first ultrasonic element 10 A in an ultrasonic wave irradiation direction.
  • the double feed detection apparatus includes the first ultrasonic element 10 A and the second ultrasonic element 10 B which are arranged such that the ultrasonic wave irradiation direction is perpendicular to conveyance direction X of the sheet P 1 , P 2 .
  • the double feed detection apparatus includes the first ultrasonic element 10 A and the second ultrasonic element 10 B which are arranged such that the incident angle of the ultrasonic wave with respect to the surface of the sheet P 1 , P 2 becomes an angle ⁇ 1 .
  • the ultrasonic wave is attenuated according to the length L of a distance between the ultrasonic elements 10 A and 10 B, it is desirable that L is short.
  • the angle ⁇ 1 is an angle larger than 0°, and when the distance L between the first ultrasonic element 10 A and the second ultrasonic element 10 B is the same, it is desirable that the angle is small. However, when the angle ⁇ 1 is excessively small, the arrangement of the respective ultrasonic elements becomes difficult.
  • a transmission wave B 1 of an ultrasonic wave irradiated by the first ultrasonic element 10 A is transmitted in air while spreading gently and concentrically, and is irradiated at the angle ⁇ 1 to a double feed portion C of the sheet P 1 and the sheet P 2 indicated by oblique lines. Accordingly, the transmission wave 81 reaches the sheet P 1 , P 2 in a transmission range B 3 indicated as a hatched portion, and a transmission wave B 2 of the ultrasonic wave passing through the transmission range B 3 reaches the second ultrasonic element 10 B.
  • the transmission range B 3 has an elliptical shape extending in the direction perpendicular to the sheet conveyance direction X. Accordingly, since the width of the transmission range B 3 in the sheet conveyance direction X becomes narrow, even if the width of the double feed portion C in the sheet conveyance direction is narrow, the double feed detection apparatus of this embodiment can detect the double feed at high accuracy.
  • FIG. 4 is a view in which widths of detect-able double feed portions are compared.
  • FIG. 5 is a view showing detection levels of transmitted ultrasonic waves by the double feed detection apparatus of this embodiment.
  • a forward direction of the related art that is, in the case of FIG. 12 in which the subsequent sheet P 2 overlaps on the preceding sheet P 1
  • a reverse direction of the related art that is, in the case of FIG. 13 in which the subsequent sheet P 2 is overlapped by the preceding sheet P 1
  • the width of the double feed portion C becomes as narrow as about 3 mm, the double feed can not be detected.
  • the double feed detection apparatus of this embodiment can detect the double feed even when the sheets P 1 and P 2 overlap with each other in either direction and even when the width of the double feed portion C becomes narrow.
  • FIG. 6 is a block diagram showing a structure of a double feed detection apparatus of this embodiment.
  • the double feed detection apparatus includes a CPU 101 as a control section, a transmission signal generation section 102 to generate a transmission signal from the control signal of the control section, a transmission amplifying section 103 to amplify a transmission signal, a first light emitting element 20 A as a first element to irradiate a light to a sheet, a second light reception element 20 B as a second element which includes a lens 20 C, receives the light passing through the sheet and generates an electric signal, a reception amplifying section 105 to amplify a received signal, an A/D converter 106 to convert an analog signal into a digital signal, and a storage device 107 as a memory such as a ROM or a RAM.
  • a CPU 101 as a control section
  • a transmission signal generation section 102 to generate a transmission signal from the control signal of the control section
  • a transmission amplifying section 103 to
  • the CPU 101 generates a control signal and outputs it to the transmission signal generation section 102 .
  • the transmission signal generation section 102 converts the input signal from the CPU into an element drive signal and outputs it to the transmission amplifying section 103 .
  • the transmission amplifying section 103 amplifies the input signal and outputs it to the light emitting element 20 A.
  • the light emitting element 20 A irradiates a light to a sheet.
  • the light receiving element 20 B receives the light passing through the sheet, converts it into an electric signal, and outputs it to the reception amplifying section 105 .
  • the reception amplifying section 105 amplifies the input signal and outputs it to the A/D convert 106 .
  • the A/D converter 106 converts the input analog signal into a digital signal and outputs it to the CPU 101 .
  • the storage device 107 stores a threshold for a level.
  • the CPU 101 determines that when the level of the input signal is lower than the threshold read from the storage device 107 , the sheet is doubly fed.
  • the positional relation between the light emitting element 20 A and the light receiving element 20 B may be the same as the positional relation between the first ultrasonic element 20 A and the second ultrasonic element 10 B of the first embodiment shown in FIG. 2 and FIG. 3 .
  • FIG. 7 is a view showing a case where the angle ⁇ 1 shown in FIG. 3 becomes an angle ⁇ 2 which is 90°.
  • the double feed detection apparatus includes the light emitting element 20 A at the front surface side of the sheet P 1 , P 2 , and the light receiving element 20 B at the rear surface side of the sheet P 1 , P 2 and in front of the light emitting element 10 A in the light irradiation direction.
  • the positions of the light emitting element 20 A and the light receiving element 208 may be reversed.
  • the double feed detection apparatus includes the light emitting element 20 A and the light receiving element 208 which are arranged such that the light irradiation direction is perpendicular to the conveyance direction X of the sheet P 1 , P 2 .
  • the double feed detection apparatus includes the light emitting element 20 A and the light receiving element 20 B so as to have the angle ⁇ 1 with respect to the surface of the sheet P 1 , P 2 . It is desirable that the angle ⁇ 1 is larger than 0° and smaller than 90°. When the angle is excessively small, the arrangement of the light emitting element 20 A and the light receiving element 20 B becomes difficult.
  • the incident beam B 1 of the light irradiated by the light emitting element 20 A is irradiated at the angle ⁇ 1 to the double feed portion C of the sheet P 1 and the sheet P 2 indicated by oblique lines. Accordingly, the incident beam B 1 reaches the sheet P 1 , P 2 in the transmission range B 3 indicated as the hatched portion, and the transmission beam 52 of the light passing through the transmission range B 3 reaches the light receiving element 20 B.
  • the transmission range B 3 has the elliptical shape extending in the direction perpendicular to the sheet conveyance direction X. Accordingly, since the width of the transmission range B 3 in the sheet conveyance direction X becomes narrow, even if the width of the double feed portion C in the sheet conveyance direction is narrow, the double feed detection apparatus of this embodiment can detect the double feed at high accuracy.
  • FIG. 8 is a view showing a structure of an auto sheet feeder including the double feed detection apparatus of this embodiment.
  • an auto sheet feeder 700 includes a paper feed tray 701 on which a document P to be read is placed, a pickup roller 702 to take out the sheet P one by one from the paper feed tray 701 and to deliver it to a conveyance mechanism, the conveyance mechanism to receive the sheet P from the pickup roller 702 and to convey it, a front surface read section 723 to read a front surface of the sheet P, a rear surface read section 720 to read a rear surface of the sheet P, and a storage tray 724 on which the read sheet is stacked.
  • the conveyance mechanism includes an inlet roller 704 to receive the sheet P from the pickup roller 702 , a first conveyance roller 707 to receive the sheet from the inlet roller 704 and to convey it, a flapper 709 to change a conveyance path of the sheet P, an outside conveyance path D 1 as a first conveyance path, and an inside conveyance path D 2 as a second conveyance path whose conveyance distance is shorter than the first conveyance path.
  • the flapper 709 moves up and down as indicated by an arrow F and alternately changes over the sheet conveyance path between the outside conveyance path D 1 and the inside conveyance path D 2 .
  • the outside conveyance path D 1 includes an outside conveyance roller 711 and an OUT sheet passing sensor 715 to detect the passing of the sheet.
  • the inside conveyance path ⁇ 2 includes an inside conveyance roller 713 and an IN sheet passing sensor 716 to detect the passing of the sheet.
  • the outside conveyance path D 1 and the inside conveyance path D 2 join each other at the downstream side of the OUT sheet passing sensor 715 and the IN sheet passing sensor 716 in the sheet conveyance direction.
  • the joined conveyance path includes a second conveyance roller 717 at the downstream side of the joining point in the sheet conveyance direction, the front surface read section 723 at a read part 722 , a third conveyance roller 718 at the downstream side of the read part 722 in the sheet conveyance direction, the rear surface read section 720 , and a paper discharge roller 721 .
  • the pickup roller 702 is moved up and down by a solenoid 703 .
  • the flapper 709 is moved up and down by a solenoid 710 .
  • the inlet roller 704 is driven by an inlet motor 705 , the first conveyance roller 707 is driven by a first motor 708 , the outside conveyance roller 711 is driven by an outside motor 712 , the inside conveyance roller 713 is driven by an inside motor 714 , the second conveyance roller 717 and the third conveyance roller 718 are driven by a second motor 719 A, and the paper discharge roller 721 is driven by a discharge motor 719 B.
  • the auto sheet feeder 700 includes the double feed detection apparatus, and includes a first element S 1 and a second element S 2 of the double feed detection apparatus in a range which is indicated by an arrow Z and extends from the downstream side of the joining point of the outside conveyance path D 1 and the inside conveyance path D 2 in the sheet conveyance direction to a near side of the read part.
  • the second element S 2 is an ultrasonic element.
  • the first element S 1 is a light emitting element
  • the second element S 2 is a light receiving element.
  • FIG. 9 is a view showing a structure of the auto sheet feeder 700 .
  • the auto sheet feeder 700 includes the double feed detection apparatus.
  • the double feed detection apparatus may be the double feed detection apparatus of the first embodiment or the double feed detection apparatus of the second embodiment.
  • FIG. 9 shows the auto sheet feeder 700 including the double feed detection apparatus of the first embodiment.
  • the auto sheet feeder 700 includes, as the double feed detection apparatus, a CPU 101 as a control section, a transmission signal generation section 102 to generate a transmission signal from a control signal of the CPU 101 , a transmission amplifying section 103 to amplify the transmission signal, a changeover switch 104 to switch between an output destination and an input destination, a first ultrasonic element 10 A as a first element to transmit and receive an ultrasonic wave, a second ultrasonic element 10 B as a second element, a reception amplifying section 105 to amplify a received signal, an A/D converter 106 to convert an analog signal into a digital signal; and a storage device 107 as a memory such as a ROM or a RAM.
  • the auto sheet feeder 700 further includes a pickup sensor 801 to detect pick-up of a sheet, an OUT sheet passing sensor 715 , an IN sheet passing sensor 716 , a paper discharge sensor 802 to detect discharge of the sheet, a pickup roller drive section 803 to drive the pickup roller 702 , a flapper drive section 804 to drive the flapper 709 , and a sheet conveyance mechanism drive section 805 to drive rollers to convey the sheet along a sheet conveyance path.
  • a pickup sensor 801 to detect pick-up of a sheet
  • an OUT sheet passing sensor 715 to detect pickup of the sheet
  • a paper discharge sensor 802 to detect discharge of the sheet
  • a pickup roller drive section 803 to drive the pickup roller 702
  • a flapper drive section 804 to drive the flapper 709
  • a sheet conveyance mechanism drive section 805 to drive rollers to convey the sheet along a sheet conveyance path.
  • a rear surface read section 720 and a front surface read section 723 output a read signal of a document to an upper-level machine control section 810 as a control section of an upper-level machine such as a printer.
  • the auto sheet feeder 700 takes up a first sheet P 1 by the pickup roller 702 from the paper feed tray 701 and delivers it to the inlet roller 704 .
  • the flapper 709 is displaced to an upper side.
  • the auto sheet feeder 700 conveys the first sheet P 1 to the read part 722 through the inside conveyance path D 2 whose conveyance distance is shorter than the outside conveyance path D 1 .
  • the flapper 709 is displaced to a lower side.
  • the auto sheet feeder 700 conveys a second sheet P 2 to the read part 722 through the outside conveyance path D 1 .
  • the flapper 709 is again displaced to the upper side.
  • the auto sheet feeder 700 drives the outside conveyance roller 711 to convey the sheet P 2 to the joining point.
  • the double feed detection apparatus detects whether the trailing edge of the sheet P 1 and the leading edge of the sheet P 2 are doubly fed.
  • the auto sheet feeder 700 operates to deal with the double feed.
  • the sheet P 2 is conveyed to the read part 722 .
  • the auto sheet feeder 700 causes the front surface read section 723 and the rear surface read section 720 to read the preceding sheet P 0 , the next conveyed sheet P 1 and the finally conveyed sheet P 2 in that order, and discharges the sheets to the storage tray 724 .
  • the auto sheet feeder 700 When the OUT sheet passing sensor 715 or the IN sheet passing sensor 716 is damaged to be ON, the auto sheet feeder 700 does not use the conveyance path having the damaged sensor, and conveys the sheet to only the conveyance path having the normal sensor.
  • the flapper 709 is displaced so that the sheet is conveyed to the conveyance path at one side.
  • the auto sheet feeder 700 continuously detects a jam in the conveyance path on the same side.
  • the auto sheet feeder 700 when the number of times in which the jam occurs continuously exceeds a threshold, the auto sheet feeder 700 does not use the conveyance path where the jam occurs continuously, and conveys the sheet to only the normal conveyance path.
  • the flapper 709 is displaced so that the sheet is conveyed to the normal conveyance path.
  • the double feed detection apparatus of the embodiment includes the first element S 1 and the second element S 2 at positions where they are opposite to each other across the sheet, and the direction in which the ultrasonic wave or the light passes through the sheet is vertical to the conveyance direction of the sheet.
  • the auto sheet feeder 700 of the embodiment includes the first element S 1 and the second element S 2 of the double feed detection apparatus in the range from the downstream side of the joining point of the outside conveyance path D 1 and the inside conveyance path D 2 in the sheet conveyance direction to the near side of the read part.

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  • Controlling Sheets Or Webs (AREA)
US12/874,966 2009-10-06 2010-09-02 Double feeding detection apparatus, auto sheet feeder and double feed detection method Abandoned US20110079953A1 (en)

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US12/874,966 US20110079953A1 (en) 2009-10-06 2010-09-02 Double feeding detection apparatus, auto sheet feeder and double feed detection method
JP2010204404A JP5539130B2 (ja) 2009-10-06 2010-09-13 重送検出装置、自動紙状体送り装置、及び重送検知方法

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US24896309P 2009-10-06 2009-10-06
US24895809P 2009-10-06 2009-10-06
US24895409P 2009-10-06 2009-10-06
US12/874,966 US20110079953A1 (en) 2009-10-06 2010-09-02 Double feeding detection apparatus, auto sheet feeder and double feed detection method

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US (1) US20110079953A1 (enrdf_load_stackoverflow)
JP (1) JP5539130B2 (enrdf_load_stackoverflow)
CN (1) CN102030206A (enrdf_load_stackoverflow)

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US20130069299A1 (en) * 2011-09-20 2013-03-21 Hiroki Matsuoka Sheet transport apparatus and sheet transport method
CN103522764A (zh) * 2012-07-04 2014-01-22 虹光精密工业股份有限公司 打印设备及双面打印方法

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CN110787982B (zh) * 2018-08-01 2021-10-15 精工爱普生株式会社 超声波装置

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