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 PDFInfo
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- 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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- sheet
- signal
- ultrasonic
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- transmission
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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
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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
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/52—Defective operating conditions
- B65H2511/524—Multiple articles, e.g. double feed
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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
- 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
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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
- 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.
Abstract
A double feed detection apparatus includes a first element and a second element at positions where they are opposite to each other across a sheet, and a direction in which an ultrasonic wave or a light passes through the sheet is vertical to a conveyance direction of the sheet. An auto sheet feeder includes the first element and the second element of the double feed detection apparatus in a range from a downstream side of a joining point of an outside conveyance path and an inside conveyance path in the sheet conveyance direction to a near side of a read part.
Description
- This application is based upon and claims the benefit of priority from the prior the U.S.A. Patent Application No. 61/248,954, filed on Oct. 6, 2009, the prior the U.S.A. Patent Application No. 61/248,963, filed on Oct. 6, 2009, and the prior the U.S.A. Patent Application No. 61/248,958, filed on Oct. 6, 2009, and the entire contents of which are incorporated herein by reference.
- The present invention relates to a double feed detection apparatus, an auto sheet feeder and a double feed detection method.
- When sheets such as papers or bank notes are processed by an equipment, it is necessary to detect double feed in order to avoid a jam and a read error.
- With respect to this point, a technique is proposed in which an ultrasonic wave is irradiated in parallel to a conveyance direction of a sheet so as to pass through the conveyed sheet.
-
FIG. 10 andFIG. 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 inFIG. 10 are obtained, andFIG. 13 is a view showing an ultrasonic wave irradiation direction when the levels shown inFIG. 11 are obtained. - As shown in
FIG. 10 andFIG. 11 , according to the related art, 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 inFIG. 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 inFIG. 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 inFIG. 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 θ1 shown inFIG. 3 becomes an angle θ2 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. - Throughout this description, the embodiments and examples shown should be considered as exemplars, rather than limitations on the apparatus and methods of the present embodiments.
- Hereinafter, embodiments of a double feed detection apparatus, an auto sheet feeder and a double feed detection method will be described in detail with reference to the drawings.
- 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 analog signal into a digital signal and to output it to the control section.
- 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. As shown inFIG. 1 , the double feed detection apparatus includes aCPU 101 as a control section, a transmissionsignal generation section 102 to generate a transmission signal from the control signal of the control section, a transmission amplifyingsection 103 to amplify a transmission signal, achangeover switch 104 to Switch between an output destination and an input destination, a firstultrasonic element 10A as a first element to transmit and receive an ultrasonic wave, a secondultrasonic element 10B as a second element, areception amplifying section 105 to amplify a received signal; an A/D converter 106 to convert an analog signal into a digital signal, and astorage 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 transmissionsignal generation section 102. The transmissionsignal generation section 102 converts the control signal from the CPU into a transmission signal to drive an element and outputs it to the transmission amplifyingsection 103. The transmission amplifyingsection 103 amplifies the input signal and outputs it to the firstultrasonic element 10A through thechangeover switch 104. The firstultrasonic element 10A irradiates an ultrasonic wave to a sheet. - The second
ultrasonic element 10B receives the ultrasonic wave passing through the sheet, converts it into an electric signal, and outputs it to thereception amplifying section 105 through thechangeover switch 104. The reception amplifyingsection 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 theCPU 101. - The
changeover switch 104 changes a connection relation of the firstultrasonic element 10A and the secondultrasonic element 10B with respect to the transmission Amplifyingsection 103 and thereception amplifying section 105. - That is, when the first
ultrasonic element 10A is connected to the transmission amplifyingsection 103, thechangeover switch 104 connects the secondultrasonic element 10B to thereception amplifying section 105. When the secondultrasonic element 10B is connected to the transmission amplifyingsection 103, the changeover switch connects the firstultrasonic element 10A to thereception amplifying section 105. - Accordingly, since 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 10A and the second ultrasonic element 108 are dispersed to the two elements. Thus, the output can be increased and the life of the element can be extended. - The
storage device 107 stores a threshold for a level. TheCPU 101 determines that when the level of the input signal is lower than the threshold read from thestorage device 107, the sheet is doubly fed. -
FIG. 2 is a view showing the arrangement relation of the firstultrasonic element 10A 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 inFIG. 2 . As shown inFIG. 2 andFIG. 3 , the double feed detection apparatus includes the firstultrasonic element 10A at a front surface side of a sheet P1, P2, and includes the second ultrasonic element 108 at a rear surface side of the sheet P1, P2 and in front of the firstultrasonic element 10A in an ultrasonic wave irradiation direction. - The double feed detection apparatus includes the first
ultrasonic element 10A and the secondultrasonic element 10B which are arranged such that the ultrasonic wave irradiation direction is perpendicular to conveyance direction X of the sheet P1, P2. - Further, the double feed detection apparatus includes the first
ultrasonic element 10A and the secondultrasonic element 10B which are arranged such that the incident angle of the ultrasonic wave with respect to the surface of the sheet P1, P2 becomes an angle θ1. Since the ultrasonic wave is attenuated according to the length L of a distance between theultrasonic elements ultrasonic element 10A and the secondultrasonic element 10B is the same, it is desirable that the angle is small. However, when the angle θ1 is excessively small, the arrangement of the respective ultrasonic elements becomes difficult. Besides, when the angle θ1 becomes larger than 40°, the irradiated ultrasonic wave collides and interferes with the reflected wave reflected by the sheet and returned to the transmission side element, and is attenuated. Accordingly, as θ1 becomes large, the ultrasonic wave transmitted to the reception side becomes small, and the detection of the double feed becomes difficult. - A transmission wave B1 of an ultrasonic wave irradiated by the first
ultrasonic element 10A is transmitted in air while spreading gently and concentrically, and is irradiated at the angle θ1 to a double feed portion C of the sheet P1 and the sheet P2 indicated by oblique lines. Accordingly, thetransmission wave 81 reaches the sheet P1, P2 in a transmission range B3 indicated as a hatched portion, and a transmission wave B2 of the ultrasonic wave passing through the transmission range B3 reaches the secondultrasonic element 10B. - Here, the transmission range B3 has an elliptical shape extending in the direction perpendicular to the sheet conveyance direction X. Accordingly, since the width of the transmission range B3 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. As shown inFIG. 4 andFIG. 5 , in a forward direction of the related art, that is, in the case ofFIG. 12 in which the subsequent sheet P2 overlaps on the preceding sheet P1, and in a reverse direction of the related art, that is, in the case ofFIG. 13 in which the subsequent sheet P2 is overlapped by the preceding sheet P1, when the width of the double feed portion C becomes as narrow as about 3 mm, the double feed can not be detected. - On the other hand, the double feed detection apparatus of this embodiment can detect the double feed even when the sheets P1 and P2 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. As shown inFIG. 6 , the double feed detection apparatus includes aCPU 101 as a control section, a transmissionsignal generation section 102 to generate a transmission signal from the control signal of the control section, atransmission amplifying section 103 to amplify a transmission signal, a firstlight emitting element 20A as a first element to irradiate a light to a sheet, a secondlight reception element 20B as a second element which includes alens 20C, receives the light passing through the sheet and generates an electric signal, areception amplifying section 105 to amplify a received signal, an A/D converter 106 to convert an analog signal into a digital signal, and astorage device 107 as a memory such as a ROM or a RAM. - The
CPU 101 generates a control signal and outputs it to the transmissionsignal generation section 102. The transmissionsignal generation section 102 converts the input signal from the CPU into an element drive signal and outputs it to thetransmission amplifying section 103. Thetransmission amplifying section 103 amplifies the input signal and outputs it to thelight emitting element 20A. Thelight emitting element 20A irradiates a light to a sheet. - The
light receiving element 20B receives the light passing through the sheet, converts it into an electric signal, and outputs it to thereception amplifying section 105. Thereception 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 theCPU 101. - The
storage device 107 stores a threshold for a level. TheCPU 101 determines that when the level of the input signal is lower than the threshold read from thestorage device 107, the sheet is doubly fed. - The positional relation between the light emitting
element 20A and thelight receiving element 20B may be the same as the positional relation between the firstultrasonic element 20A and the secondultrasonic element 10B of the first embodiment shown inFIG. 2 andFIG. 3 . -
FIG. 7 is a view showing a case where the angle θ1 shown inFIG. 3 becomes an angle θ2 which is 90°. - As shown in
FIG. 3 andFIG. 7 , the double feed detection apparatus includes thelight emitting element 20A at the front surface side of the sheet P1, P2, and thelight receiving element 20B at the rear surface side of the sheet P1, P2 and in front of thelight emitting element 10A in the light irradiation direction. The positions of thelight emitting element 20A and the light receiving element 208 may be reversed. - The double feed detection apparatus includes the
light emitting element 20A 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 P1, P2. - Further, the double feed detection apparatus includes the
light emitting element 20A and thelight receiving element 20B so as to have the angle θ1 with respect to the surface of the sheet P1, P2. It is desirable that the angle θ1 is larger than 0° and smaller than 90°. When the angle is excessively small, the arrangement of thelight emitting element 20A and thelight receiving element 20B becomes difficult. - The incident beam B1 of the light irradiated by the
light emitting element 20A is irradiated at the angle θ1 to the double feed portion C of the sheet P1 and the sheet P2 indicated by oblique lines. Accordingly, the incident beam B1 reaches the sheet P1, P2 in the transmission range B3 indicated as the hatched portion, and the transmission beam 52 of the light passing through the transmission range B3 reaches thelight receiving element 20B. - Here, the transmission range B3 has the elliptical shape extending in the direction perpendicular to the sheet conveyance direction X. Accordingly, since the width of the transmission range B3 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.
- Incidentally, as shown in
FIG. 7 , differently from the ultrasonic wave, even if θ1 becomes θ2 which is 90°, although an incident beam 85 is attenuated by reflection at the sheet P1 or P2, the incident beam is transmitted and becomes a transmission beam B4. Accordingly, when the light is used, the degree of freedom with respect to the angle is higher than that of the ultrasonic wave. - Structure of Auto Sheet Feeder
-
FIG. 8 is a view showing a structure of an auto sheet feeder including the double feed detection apparatus of this embodiment. As shown inFIG. 8 ; anauto sheet feeder 700 includes apaper feed tray 701 on which a document P to be read is placed, apickup roller 702 to take out the sheet P one by one from thepaper feed tray 701 and to deliver it to a conveyance mechanism, the conveyance mechanism to receive the sheet P from thepickup roller 702 and to convey it, a front surface readsection 723 to read a front surface of the sheet P, a rear surface readsection 720 to read a rear surface of the sheet P, and astorage tray 724 on which the read sheet is stacked. - The conveyance mechanism includes an
inlet roller 704 to receive the sheet P from thepickup roller 702, afirst conveyance roller 707 to receive the sheet from theinlet roller 704 and to convey it, aflapper 709 to change a conveyance path of the sheet P, an outside conveyance path D1 as a first conveyance path, and an inside conveyance path D2 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 D1 and the inside conveyance path D2. The outside conveyance path D1 includes anoutside conveyance roller 711 and an OUTsheet passing sensor 715 to detect the passing of the sheet. The inside conveyance path θ2 includes aninside conveyance roller 713 and an INsheet passing sensor 716 to detect the passing of the sheet. - The outside conveyance path D1 and the inside conveyance path D2 join each other at the downstream side of the OUT
sheet passing sensor 715 and the INsheet 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 readsection 723 at aread part 722, athird conveyance roller 718 at the downstream side of the readpart 722 in the sheet conveyance direction, the rear surface readsection 720, and apaper discharge roller 721. - The
pickup roller 702 is moved up and down by asolenoid 703. Theflapper 709 is moved up and down by asolenoid 710. - The
inlet roller 704 is driven by aninlet motor 705, thefirst conveyance roller 707 is driven by afirst motor 708, theoutside conveyance roller 711 is driven by anoutside motor 712, theinside conveyance roller 713 is driven by aninside motor 714, thesecond conveyance roller 717 and thethird conveyance roller 718 are driven by asecond motor 719A, and thepaper discharge roller 721 is driven by adischarge motor 719B. - The
auto sheet feeder 700 includes the double feed detection apparatus, and includes a first element S1 and a second element S2 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 D1 and the inside conveyance path D2 in the sheet conveyance direction to a near side of the read part. - When the first element S1 is an ultrasonic element, the second element S2 is an ultrasonic element. When the first element S1 is a light emitting element, the second element S2 is a light receiving element.
-
FIG. 9 is a view showing a structure of theauto sheet feeder 700. As shown inFIG. 9 , theauto 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 theauto 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, aCPU 101 as a control section, a transmissionsignal generation section 102 to generate a transmission signal from a control signal of theCPU 101, atransmission amplifying section 103 to amplify the transmission signal, achangeover switch 104 to switch between an output destination and an input destination, a firstultrasonic element 10A as a first element to transmit and receive an ultrasonic wave, a secondultrasonic element 10B as a second element, areception amplifying section 105 to amplify a received signal, an A/D converter 106 to convert an analog signal into a digital signal; and astorage device 107 as a memory such as a ROM or a RAM. - The
auto sheet feeder 700 further includes apickup sensor 801 to detect pick-up of a sheet, an OUTsheet passing sensor 715, an INsheet passing sensor 716, apaper discharge sensor 802 to detect discharge of the sheet, a pickuproller drive section 803 to drive thepickup roller 702, aflapper drive section 804 to drive theflapper 709, and a sheet conveyancemechanism 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 readsection 723 output a read signal of a document to an upper-levelmachine control section 810 as a control section of an upper-level machine such as a printer. - Operation of the Auto Sheet Feeder
- The
auto sheet feeder 700 takes up a first sheet P1 by thepickup roller 702 from thepaper feed tray 701 and delivers it to theinlet roller 704. Theflapper 709 is displaced to an upper side. - The
auto sheet feeder 700 conveys the first sheet P1 to theread part 722 through the inside conveyance path D2 whose conveyance distance is shorter than the outside conveyance path D1. Theflapper 709 is displaced to a lower side. - The
auto sheet feeder 700 conveys a second sheet P2 to theread part 722 through the outside conveyance path D1. Theflapper 709 is again displaced to the upper side. - When the IN
sheet passing sensor 716 detects the passing of the sheet P1, theauto sheet feeder 700 drives theoutside conveyance roller 711 to convey the sheet P2 to the joining point. - In the
auto sheet feeder 700, at this time, the double feed detection apparatus detects whether the trailing edge of the sheet P1 and the leading edge of the sheet P2 are doubly fed. When the double feed is detected, theauto sheet feeder 700 operates to deal with the double feed. When the double feed is not detected, the sheet P2 is conveyed to theread part 722. - The
auto sheet feeder 700 causes the front surface readsection 723 and the rear surface readsection 720 to read the preceding sheet P0, the next conveyed sheet P1 and the finally conveyed sheet P2 in that order, and discharges the sheets to thestorage tray 724. - Operation in the Case of Sensor Abnormality
- When the OUT
sheet passing sensor 715 or the INsheet passing sensor 716 is damaged to be ON, theauto 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. - That is, in this case, the
flapper 709 is displaced so that the sheet is conveyed to the conveyance path at one side. - When the OUT
sheet passing sensor 715 or the INsheet passing sensor 716 is damaged to be OFF, theauto sheet feeder 700 continuously detects a jam in the conveyance path on the same side. - In this case, 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. - That is, in this case, the
flapper 709 is displaced so that the sheet is conveyed to the normal conveyance path. - Effects of the Embodiments
- As described above, the double feed detection apparatus of the embodiment includes the first element S1 and the second element S2 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.
- Accordingly, there is an effect that even when the width of the double feed portion of the sheet is narrow, the double feed can be detected at high accuracy.
- Besides, the
auto sheet feeder 700 of the embodiment includes the first element S1 and the second element S2 of the double feed detection apparatus in the range from the downstream side of the joining point of the outside conveyance path D1 and the inside conveyance path D2 in the sheet conveyance direction to the near side of the read part. - Accordingly, there is an effect that the sheet can be fed while the double feed of the sheet is detected at high accuracy.
- While certain embodiments have been described, these embodiments have been presented by way of example only, and, are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are indeed to cover such forms or modifications as would fall within the scope and spirit of the inventions.
Claims (20)
1. A double feed detection apparatus comprising:
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 the 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 the 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.
2. The apparatus of claim 1 , wherein the first element is a first ultrasonic element and the second element is a second ultrasonic element.
3. The apparatus of claim 2 , wherein the first ultrasonic element and the second ultrasonic element are provided to have an ultrasonic wave incident angle of 40° or less with respect to a surface of the sheet.
4. The apparatus of claim 3 , further comprising a changeover switch, wherein when the first ultrasonic element is connected to the transmission amplifying section, the second ultrasonic element is connected to the reception amplifying section, and when the second ultrasonic element is connected to the transmission amplifying section, the first ultrasonic element is connected to the reception amplifying section.
5. The apparatus of claim 1 , wherein the first element is a light emitting element, and the second element is a light receiving element.
6. The apparatus of claim 5 , wherein the light emitting element and the light receiving element are provided to have a light incident angle of 90° or less with respect to a surface of the sheet.
7. An auto sheet feeder comprising:
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 pat, 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 the 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 the 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.
8. The feeder of claim 7 , wherein the first element is a first ultrasonic element and the second element is a second ultrasonic element.
9. The feeder of claim 8 , wherein the first ultrasonic element and the second ultrasonic element are provided to have an ultrasonic wave incident angle of 40° or less with respect to a surface of the sheet.
10. The feeder of claim 9 , further comprising a changeover switch, wherein when the first ultrasonic element is connected to the transmission amplifying section, the second ultrasonic element is connected to the reception amplifying section, and when the second ultrasonic element is connected to the transmission amplifying section, the first ultrasonic element is connected to the reception amplifying section.
11. The feeder of claim 7 , wherein the first element is a light emitting element, and the second element is a light receiving element.
12. The feeder of claim 11 , wherein the light emitting element and the light receiving element are provided to have alight incident angle of 90° or less with respect to a surface of the sheet.
13. The feeder of claim 7 , wherein the first element and the second element are provided in a range from a downstream side of a joining point of the outside conveyance path and the inside conveyance path in the sheet conveyance direction to a near side of a read part.
14. The feeder of claim 7 , wherein when one of an OUT sheet passing sensor to detect passing of the sheet along the outside conveyance path and an IN sheet passing sensor to detect passing of the sheet along the inside conveyance path is damaged to be ON, the conveyance path having the damaged sensor is not used, and the sheet is conveyed to only the conveyance path having the normal sensor.
15. The feeder of claim 7 , wherein when one of an OUT sheet passing sensor to detect passing of the sheet along the outside conveyance path and an IN sheet passing sensor to detect passing of the sheet along the inside conveyance path is damaged to be OFF, the conveyance path where a jam occurs continuously is not used, and the sheet is conveyed to only the normal conveyance path.
16. A double feed detection method comprising:
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 the 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 the 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.
17. The method of claim 16 , wherein the first element is a first ultrasonic element and the second element is a second ultrasonic element.
18. The method of claim 17 , wherein the first ultrasonic element and the second ultrasonic element are provided to have an ultrasonic wave incident angle of 40° or less with respect to a surface of the sheet.
19. The method of claim 18 , wherein a changeover switch is used and when the first ultrasonic element is connected to the transmission amplifying section, the second ultrasonic element is connected to the reception amplifying section, and when the second ultrasonic element is connected to the transmission amplifying section, the first ultrasonic element is connected to the reception amplifying section.
20. The method of claim 16 , wherein
the first element is a light emitting element,
the second element is a light receiving element, and
the light emitting element and the light receiving element are provided to have a light incident angle of 90° or less with respect to a surface of the sheet.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 (en) | 2009-10-06 | 2010-09-13 | Double feed detection device, automatic paper feeder, and double feed detection method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US24896309P | 2009-10-06 | 2009-10-06 | |
US24895409P | 2009-10-06 | 2009-10-06 | |
US24895809P | 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 |
Publications (1)
Publication Number | Publication Date |
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US20110079953A1 true US20110079953A1 (en) | 2011-04-07 |
Family
ID=43822594
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US12/874,966 Abandoned US20110079953A1 (en) | 2009-10-06 | 2010-09-02 | Double feeding detection apparatus, auto sheet feeder and double feed detection method |
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Country | Link |
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US (1) | US20110079953A1 (en) |
JP (1) | JP5539130B2 (en) |
CN (1) | CN102030206A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110056799A1 (en) * | 2009-09-08 | 2011-03-10 | Toshiba Tec Kabushiki Kaisha | Medium detecting method, medium detecting device, medium discharge device and printing apparatus |
US20130069299A1 (en) * | 2011-09-20 | 2013-03-21 | Hiroki Matsuoka | Sheet transport apparatus and sheet transport method |
CN103522764A (en) * | 2012-07-04 | 2014-01-22 | 虹光精密工业股份有限公司 | Printing apparatus and duplex printing method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5754477B2 (en) * | 2013-07-24 | 2015-07-29 | コニカミノルタ株式会社 | Sheet conveying apparatus, document reading apparatus, and image forming apparatus |
CN110787982B (en) * | 2018-08-01 | 2021-10-15 | 精工爱普生株式会社 | Ultrasonic device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003160257A (en) * | 2001-11-22 | 2003-06-03 | Omron Corp | Paper sheet overlap feed detector and method, and program |
CN100353739C (en) * | 2003-07-17 | 2007-12-05 | 尼司卡股份有限公司 | Sheet handling apparatus and image reading apparatus |
JP2005162424A (en) * | 2003-12-04 | 2005-06-23 | Nisca Corp | Sheet feeding device and image reading device using this |
CN100556059C (en) * | 2003-12-04 | 2009-10-28 | 尼司卡股份有限公司 | Thin slice resending detecting method and thin slice feeder and adopt its image read-out |
JP4124167B2 (en) * | 2004-06-14 | 2008-07-23 | コニカミノルタビジネステクノロジーズ株式会社 | Paper feeder |
JP2006248701A (en) * | 2005-03-10 | 2006-09-21 | Fuji Xerox Co Ltd | Sheet material conveying device and image forming device |
JP2007331909A (en) * | 2006-06-16 | 2007-12-27 | Canon Electronics Inc | Double feed detector, its control method, and program |
JP2008189436A (en) * | 2007-02-05 | 2008-08-21 | Seiko Epson Corp | Sheet carrying device and image reading device |
JP4812114B2 (en) * | 2007-02-23 | 2011-11-09 | オムロン株式会社 | Paper sheet multi-feed detection device and paper multi-feed detection method |
JP4874135B2 (en) * | 2007-02-28 | 2012-02-15 | キヤノン電子株式会社 | Double feed detection device and double feed detection method |
-
2010
- 2010-09-02 US US12/874,966 patent/US20110079953A1/en not_active Abandoned
- 2010-09-13 JP JP2010204404A patent/JP5539130B2/en active Active
- 2010-09-20 CN CN2010102929118A patent/CN102030206A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110056799A1 (en) * | 2009-09-08 | 2011-03-10 | Toshiba Tec Kabushiki Kaisha | Medium detecting method, medium detecting device, medium discharge device and printing apparatus |
US8931620B2 (en) * | 2009-09-08 | 2015-01-13 | Toshiba Tec Kabushiki Kaisha | Medium detecting method, medium detecting device, medium discharge device and printing apparatus |
US20130069299A1 (en) * | 2011-09-20 | 2013-03-21 | Hiroki Matsuoka | Sheet transport apparatus and sheet transport method |
US8657285B2 (en) * | 2011-09-20 | 2014-02-25 | Pfu Limited | Sheet transport apparatus and sheet transport method |
CN103522764A (en) * | 2012-07-04 | 2014-01-22 | 虹光精密工业股份有限公司 | Printing apparatus and duplex printing method |
US8899572B2 (en) * | 2012-07-04 | 2014-12-02 | Avision Inc. | Printing apparatus with sheet entry inhibiting controller |
TWI472442B (en) * | 2012-07-04 | 2015-02-11 | Avision Inc | Printing apparatus and duplex printing method therefor |
US9284145B2 (en) | 2012-07-04 | 2016-03-15 | Avision Inc. | Duplex printing method for printing apparatus |
Also Published As
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JP2011079673A (en) | 2011-04-21 |
JP5539130B2 (en) | 2014-07-02 |
CN102030206A (en) | 2011-04-27 |
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