US20060244196A1 - Multiple sheet detection system - Google Patents
Multiple sheet detection system Download PDFInfo
- Publication number
- US20060244196A1 US20060244196A1 US11/118,143 US11814305A US2006244196A1 US 20060244196 A1 US20060244196 A1 US 20060244196A1 US 11814305 A US11814305 A US 11814305A US 2006244196 A1 US2006244196 A1 US 2006244196A1
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- US
- United States
- Prior art keywords
- detection device
- doubles
- detection
- output signal
- path
- 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
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Classifications
-
- 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
- B65H7/125—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 sensing the double feed or separation without contacting the articles
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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
- B65H7/04—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 absence of articles, e.g. exhaustion of pile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2403/00—Power transmission; Driving means
- B65H2403/70—Clutches; Couplings
- B65H2403/72—Clutches, brakes, e.g. one-way clutch +F204
-
- 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
- B65H2511/10—Size; Dimensions
- B65H2511/13—Thickness
-
- 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
- B65H2511/20—Location in space
-
- 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
- B65H2511/51—Presence
-
- 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
- B65H2515/30—Forces; Stresses
- B65H2515/34—Pressure, e.g. fluid pressure
-
- 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
Definitions
- the present invention relates to document transports, and more particularly to a detector for detecting multiple feed sheets.
- a preferred method of feeding documents into the transport is via an automated document feeder.
- an automated document feeder may feed more than one document at a time. In the event that more than one document is fed, there is a need to detect that “doubles” or multiple documents are present.
- One system for detecting multiple feed documents is by measuring the thickness of the document.
- measuring the thickness of the documents is not a viable solution.
- a thickness detector is a contact method of sensing multiple documents and has a disadvantage that paper jams can result.
- the contact method also requires calibration using the maximum thickness document that will be fed through the document transport.
- Another device for detecting multiple feed documents is utilizing a vacuum system.
- a vacuum system In a vacuum system, detection of multiple feed documents of different thicknesses is possible.
- a vacuum system is fairly reliable; however, the vacuum sensors must be placed in close proximity to each side of the document in order to detect multiple feed documents.
- a vacuum is placed on both sides of the document path. If a single item is fed, then that item blocks only one vacuum. If two or more documents are fed simultaneously, then both vacuums are blocked.
- the use of a vacuum doubles detect system is not desirable. In an open track document transport, a doubles detection system must not interfere with the open track design.
- Another contact device for detecting sheet doubles utilizes rollers on each side of the document path and the rotation of the rollers is monitored, such as in a magnetic clutch and roller device.
- One roller, or a set of rollers is controlled by a drive mechanism.
- the opposing roller or set of rollers is connected to a mechanical clutch and the speed of this roller set is controlled by contact with the driven rollers, or the documents that pass between them. If a single item is passed between this type of detector, then the opposing rollers will match the speed of the driven roller and no multiple sheets are detected. If two or more sheets are fed simultaneously through the device, then the magnetic brake will cause slippage between the multiple sheets, creating a speed mis-match between the opposing rollers and the driven rollers. Detection of doubles is then realized.
- a non-contact device for multiple document detection utilizes ultrasound signals which pass through the document to determine if more than one document is present. Sending ultrasound waves through paper results in attenuation of the ultrasound signal. It is possible to determine the presence of multiple documents by the change in attenuation of the signal received.
- An ultrasound detector is independent of the thickness of the individual documents and detection made without making contact with these documents.
- a continuously transmitted sonic wave causes vibrations in the first sheet which is then transmitted via the intervening air to the second sheet, which also begins to vibrate.
- the receiver unit of an ultrasonic detection system is able to detect these weakened signals via the air.
- a multiple feed document detection system for use with a document transport for detecting the presence of multiple documents.
- the system utilizes multiple doubles detection devices wherein each device detects the presence of doubles.
- the output signals of each device are applied to a comparator which compares the signals obtained from each device. If each device indicates the presence of doubles, then the comparator provides an output that multiple sheets are present.
- the present system thereby eliminates the reading of false doubles by the comparison of the output signals from two or more doubles detection devices.
- System 10 includes an ultrasonic detection device 12 which provides a first output signal 14 indicating the presence of multiple sheets and a second output signal 16 indicating that no multiple sheets are detected.
- Ultrasonic detection device 12 may include, for example, devices described and shown in U.S. Pat. Nos. 4,066,969 and 6,511,064, which descriptions are hereby incorporated by reference. Signals 14 and 16 are applied to a comparator 18 whose operation will be subsequently described.
- Detection system 10 further includes a magnetic clutch and roller detection device 20 .
- Detection device 20 generates a first signal 22 indicating the presence of multiple documents, and a second signal 24 indicating that no multiple documents are present. Signals 22 and 24 are applied to comparator 18 .
- Clutch and roller detection device 20 may comprise, for example, the device described and shown in U.S. patent application Ser. No. 10/962,739 filed Oct. 12, 2004, which description is hereby incorporated by reference.
- Detection system 10 further includes a sheet thickness detection device 30 .
- Detection device 30 generates a first output signal 32 indicating the presence of multiple documents, and a second output signal 34 indicating that no multiple documents are present. Signals 32 and 34 are applied to comparator 18 .
- Detection device 30 may comprise, for example, a device such as that described in U.S. Pat. No. 5,204,537, which disclosure is hereby incorporated by reference.
- a fourth doubles detection device is included within detection system 10 and includes a vacuum sheet separator detection device 40 .
- Vacuum detection device 40 applies a vacuum to both sides of a document transport and generates a first output signal 42 indicating the presence of multiple documents, and a second signal 44 indicating that no document doubles are present. Signals 42 and 44 are applied to comparator 18 .
- Comparator 18 receives the output signals of each detection device 12 , 20 , 30 or 40 utilized within detection system 10 . Comparator 18 functions to generate a multiple sheet present signal 52 or a multiple sheet not present signal 54 . Comparator 18 functions to determine whether two or more first signals generated by a detection device 12 , 20 , 30 or 40 are present. The presence of two document doubles signals are required in order to generate a multiple sheet present signal 52 . Because detection system 10 utilizes two or more detection devices 12 , 20 , 30 or 40 , a false doubles indication by one detection device will not result in a multiple sheet present signal. For example, when an envelope passes through ultrasonic detection device 12 , first signal 14 will typically be generated, but will be a false doubles indication.
- System 10 may utilize any combination of detection devices 12 , 20 , 30 or 40 , so long as two or more devices are utilized in order to compare the data output of each detection device with that of another detection device.
Abstract
A multiple feed document detection system for use with a document transport for detecting the presence of multiple documents utilizes multiple doubles detection devices wherein each device detects the presence of doubles. The output signals of each device are applied to a comparator which compares the signals obtained from each device. If each device indicates the presence of doubles, then the comparator provides an output that multiple sheets are present. The system thereby eliminates the reading of false doubles by the comparison of the output signals from two or more doubles detection devices.
Description
- The present invention relates to document transports, and more particularly to a detector for detecting multiple feed sheets.
- For efficient document processing along a document transport, a preferred method of feeding documents into the transport is via an automated document feeder. On occasions, however, an automated document feeder may feed more than one document at a time. In the event that more than one document is fed, there is a need to detect that “doubles” or multiple documents are present.
- One system for detecting multiple feed documents is by measuring the thickness of the document. However, in applications of feeding a mixture of different types of documents, measuring the thickness of the documents is not a viable solution. Also, a thickness detector is a contact method of sensing multiple documents and has a disadvantage that paper jams can result. The contact method also requires calibration using the maximum thickness document that will be fed through the document transport.
- Another device for detecting multiple feed documents is utilizing a vacuum system. In a vacuum system, detection of multiple feed documents of different thicknesses is possible. A vacuum system is fairly reliable; however, the vacuum sensors must be placed in close proximity to each side of the document in order to detect multiple feed documents. A vacuum is placed on both sides of the document path. If a single item is fed, then that item blocks only one vacuum. If two or more documents are fed simultaneously, then both vacuums are blocked. For an open track document transport, the use of a vacuum doubles detect system is not desirable. In an open track document transport, a doubles detection system must not interfere with the open track design.
- Another contact device for detecting sheet doubles utilizes rollers on each side of the document path and the rotation of the rollers is monitored, such as in a magnetic clutch and roller device. One roller, or a set of rollers is controlled by a drive mechanism. The opposing roller or set of rollers, is connected to a mechanical clutch and the speed of this roller set is controlled by contact with the driven rollers, or the documents that pass between them. If a single item is passed between this type of detector, then the opposing rollers will match the speed of the driven roller and no multiple sheets are detected. If two or more sheets are fed simultaneously through the device, then the magnetic brake will cause slippage between the multiple sheets, creating a speed mis-match between the opposing rollers and the driven rollers. Detection of doubles is then realized. However, where a chemical reaction occurs between laser printed items and carbonless coatings, known as “sticky checks”, the multiple items are glued together, and slippage between the items is not likely to occur. Therefore, a magnetic clutch and roller device is not itself a reliable device for detecting doubles.
- A non-contact device for multiple document detection utilizes ultrasound signals which pass through the document to determine if more than one document is present. Sending ultrasound waves through paper results in attenuation of the ultrasound signal. It is possible to determine the presence of multiple documents by the change in attenuation of the signal received. An ultrasound detector is independent of the thickness of the individual documents and detection made without making contact with these documents. A continuously transmitted sonic wave causes vibrations in the first sheet which is then transmitted via the intervening air to the second sheet, which also begins to vibrate. The receiver unit of an ultrasonic detection system is able to detect these weakened signals via the air. While an ultrasonic multiple document detector can accurately detect doubles even if the documents are stuck together, a disadvantage of such detectors is that the apparatus will register a false positive when items such as envelopes are fed. Also the presence of folded corners, sometimes known as “dog ears”, will yield a false positive.
- A need has arisen for a document doubles detection system.
- In accordance with the present invention, a multiple feed document detection system for use with a document transport for detecting the presence of multiple documents is provided. The system utilizes multiple doubles detection devices wherein each device detects the presence of doubles. The output signals of each device are applied to a comparator which compares the signals obtained from each device. If each device indicates the presence of doubles, then the comparator provides an output that multiple sheets are present. The present system thereby eliminates the reading of false doubles by the comparison of the output signals from two or more doubles detection devices.
- For a more complete understanding of the present invention and for further advantages thereof, reference is now made to the following Description of the Preferred Embodiments taken in conjunction with the accompanying Drawing which is a block diagram of the present system.
- Referring to the FIGURE, the present multiple sheet detection system is illustrated, and is generally identified by the
numeral 10.System 10 includes anultrasonic detection device 12 which provides afirst output signal 14 indicating the presence of multiple sheets and asecond output signal 16 indicating that no multiple sheets are detected.Ultrasonic detection device 12 may include, for example, devices described and shown in U.S. Pat. Nos. 4,066,969 and 6,511,064, which descriptions are hereby incorporated by reference.Signals comparator 18 whose operation will be subsequently described. -
Detection system 10 further includes a magnetic clutch androller detection device 20.Detection device 20 generates afirst signal 22 indicating the presence of multiple documents, and asecond signal 24 indicating that no multiple documents are present.Signals comparator 18. Clutch androller detection device 20 may comprise, for example, the device described and shown in U.S. patent application Ser. No. 10/962,739 filed Oct. 12, 2004, which description is hereby incorporated by reference. -
Detection system 10 further includes a sheetthickness detection device 30.Detection device 30 generates afirst output signal 32 indicating the presence of multiple documents, and asecond output signal 34 indicating that no multiple documents are present.Signals comparator 18.Detection device 30 may comprise, for example, a device such as that described in U.S. Pat. No. 5,204,537, which disclosure is hereby incorporated by reference. - A fourth doubles detection device is included within
detection system 10 and includes a vacuum sheetseparator detection device 40.Vacuum detection device 40 applies a vacuum to both sides of a document transport and generates afirst output signal 42 indicating the presence of multiple documents, and asecond signal 44 indicating that no document doubles are present.Signals comparator 18. -
Comparator 18 receives the output signals of eachdetection device detection system 10.Comparator 18 functions to generate a multiple sheetpresent signal 52 or a multiple sheet notpresent signal 54.Comparator 18 functions to determine whether two or more first signals generated by adetection device present signal 52. Becausedetection system 10 utilizes two ormore detection devices ultrasonic detection device 12,first signal 14 will typically be generated, but will be a false doubles indication. When utilizingdetection device 10 with athickness detection device 30, where no doubles detection occurs for the envelope, since the output of thethickness device 30 will producesignal 34, the output ofcomparator 18 will indicate that multiple sheets are not present by generatingsignal 54.System 10 may utilize any combination ofdetection devices - Other alteration and modification of the invention will likewise become apparent to those of ordinary skill in the art upon reading the present disclosure, and it is intended that the scope of the inventions disclosed herein be limited only by the broadest interpretation of the appended claims to which the inventors are legally entitled.
Claims (9)
1. A system for detecting the presence of multiple sheets moving along a path, the system comprising:
a first doubles detection device disposed at a first position along the path, said first doubles detection device generating a first output signal upon detection of multiple sheets and a second output signal upon detection of a single sheet at the first position;
a second doubles detection device disposed at a second position along the path, said second doubles detection device generating a first output signal upon detection of multiple sheets and a second output signal upon the detection of a single sheet at the second position; and
a comparator for receiving said output signals of said first and said second doubles detection devices and for generating an output signal indicating the presence of multiple documents along the path when said first output signal of said first doubles detection device and said first output signal of said second doubles detection device are present.
2. The system of claim 1 wherein said first doubles detection device includes an ultrasonic detection device.
3. The system of claim 2 wherein said second doubles detection device includes a clutch and roller detection device.
4. The system of claim 2 wherein said second doubles detection device includes a thickness detection device.
5. The system of claim 2 wherein said second doubles detection device includes a vacuum detection device.
6. A system for detecting the presence of multiple sheets moving along a path, the system comprising:
an ultrasonic detection device disposed at a first position along the path, said ultrasonic doubles detection device generating a first output signal upon detection of multiple sheets and a second output signal upon detection of a single sheet at the first position;
a first doubles detection device disposed at a second position along the path, said first doubles detection device generating a first output signal upon detection of multiple sheets and a second output signal upon detection of a single sheet at the second position;
a second doubles detection device disposed at a third position along the path, said second doubles detection device generating a first output signal upon detection of multiple sheets and a second output signal upon the detection of a single sheet at the third position; and
a comparator for receiving said output signals of said ultrasound detection device and said first and said second doubles detection devices and for generating an output signal indicating the presence of multiple documents along the path when said first output signals of said doubles detection devices are present.
7. The system of claim 6 wherein said first doubles detection device includes a thickness detection device and said second doubles detection device includes a clutch and roller detection device.
8. The system of claim 6 wherein said first doubles detection device includes a thickness detection device and said second doubles detection device includes a vacuum detection device.
9. The system of claim 6 wherein said first doubles detection device includes a clutch and roller detection device and said second doubles detection device includes a vacuum detection device.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/118,143 US20060244196A1 (en) | 2005-04-29 | 2005-04-29 | Multiple sheet detection system |
EP06006700A EP1717177A3 (en) | 2005-04-29 | 2006-03-30 | Multiple sheet detection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/118,143 US20060244196A1 (en) | 2005-04-29 | 2005-04-29 | Multiple sheet detection system |
Publications (1)
Publication Number | Publication Date |
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US20060244196A1 true US20060244196A1 (en) | 2006-11-02 |
Family
ID=36687984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/118,143 Abandoned US20060244196A1 (en) | 2005-04-29 | 2005-04-29 | Multiple sheet detection system |
Country Status (2)
Country | Link |
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US (1) | US20060244196A1 (en) |
EP (1) | EP1717177A3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130069299A1 (en) * | 2011-09-20 | 2013-03-21 | Hiroki Matsuoka | Sheet transport apparatus and sheet transport method |
JP2016179557A (en) * | 2015-03-23 | 2016-10-13 | 富士ゼロックス株式会社 | Printer, control device and program |
Citations (14)
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US3603680A (en) * | 1969-12-24 | 1971-09-07 | Xerox Corp | Ultrasonic paper detection |
US3778051A (en) * | 1971-10-21 | 1973-12-11 | J Allen | Superposed sheet detector |
US3932755A (en) * | 1974-08-09 | 1976-01-13 | Rank Xerox Ltd. | Device for detecting double sheet feeding |
US4066969A (en) * | 1975-09-22 | 1978-01-03 | Eastman Kodak Company | Multiple sheet detecting apparatus |
US4286149A (en) * | 1979-08-09 | 1981-08-25 | Ncr Canada Ltd - Ncr Canada Ltee | Apparatus and method for detection of overlapping objects |
US5204537A (en) * | 1990-03-30 | 1993-04-20 | Recognition Equipment Incorporated | Thickness sensor comprising a leaf spring means, and a light sensor |
US5435540A (en) * | 1992-12-01 | 1995-07-25 | Xerox Corporation | Apparatus and method for sheet feeding and separating using retard roll relief/enhancement |
US20030006550A1 (en) * | 2001-06-15 | 2003-01-09 | Omron Corporation | Sheet double feeding detector, method and program of such a device |
US6511064B1 (en) * | 2000-04-19 | 2003-01-28 | Eastman Kodak Company | Method and apparatus for multiple document detection using ultrasonic phase shift amplitude |
US20030042956A1 (en) * | 2001-08-29 | 2003-03-06 | Satoru Araki | Interface circuit |
US6672587B1 (en) * | 1999-05-28 | 2004-01-06 | Heidelberger Druckmaschinen Ag | Multiple-sheet monitoring device |
US20040145110A1 (en) * | 2003-01-27 | 2004-07-29 | Eastman Kodak Company | Apparatus for detection of multiple documents in a document transport |
US20040150155A1 (en) * | 2003-01-31 | 2004-08-05 | Canon Denshi Kabushiki Kaisha | Double feed detecting apparatus for detecting double feed by ultrasonic, double feed detecting method, and recording medium having recorded therein program for executing double feed detection |
US20060115138A1 (en) * | 2003-03-12 | 2006-06-01 | De La Rue International Limited | Optical double feed detection |
-
2005
- 2005-04-29 US US11/118,143 patent/US20060244196A1/en not_active Abandoned
-
2006
- 2006-03-30 EP EP06006700A patent/EP1717177A3/en not_active Withdrawn
Patent Citations (15)
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US3603680A (en) * | 1969-12-24 | 1971-09-07 | Xerox Corp | Ultrasonic paper detection |
US3778051A (en) * | 1971-10-21 | 1973-12-11 | J Allen | Superposed sheet detector |
US3932755A (en) * | 1974-08-09 | 1976-01-13 | Rank Xerox Ltd. | Device for detecting double sheet feeding |
US4066969A (en) * | 1975-09-22 | 1978-01-03 | Eastman Kodak Company | Multiple sheet detecting apparatus |
US4286149A (en) * | 1979-08-09 | 1981-08-25 | Ncr Canada Ltd - Ncr Canada Ltee | Apparatus and method for detection of overlapping objects |
US5204537A (en) * | 1990-03-30 | 1993-04-20 | Recognition Equipment Incorporated | Thickness sensor comprising a leaf spring means, and a light sensor |
US5435540A (en) * | 1992-12-01 | 1995-07-25 | Xerox Corporation | Apparatus and method for sheet feeding and separating using retard roll relief/enhancement |
US6672587B1 (en) * | 1999-05-28 | 2004-01-06 | Heidelberger Druckmaschinen Ag | Multiple-sheet monitoring device |
US6511064B1 (en) * | 2000-04-19 | 2003-01-28 | Eastman Kodak Company | Method and apparatus for multiple document detection using ultrasonic phase shift amplitude |
US20030006550A1 (en) * | 2001-06-15 | 2003-01-09 | Omron Corporation | Sheet double feeding detector, method and program of such a device |
US20030042956A1 (en) * | 2001-08-29 | 2003-03-06 | Satoru Araki | Interface circuit |
US20040145110A1 (en) * | 2003-01-27 | 2004-07-29 | Eastman Kodak Company | Apparatus for detection of multiple documents in a document transport |
US6913259B2 (en) * | 2003-01-27 | 2005-07-05 | Daniel P. Phinney | Apparatus for detection of multiple documents in a document transport |
US20040150155A1 (en) * | 2003-01-31 | 2004-08-05 | Canon Denshi Kabushiki Kaisha | Double feed detecting apparatus for detecting double feed by ultrasonic, double feed detecting method, and recording medium having recorded therein program for executing double feed detection |
US20060115138A1 (en) * | 2003-03-12 | 2006-06-01 | De La Rue International Limited | Optical double feed detection |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
JP2016179557A (en) * | 2015-03-23 | 2016-10-13 | 富士ゼロックス株式会社 | Printer, control device and program |
Also Published As
Publication number | Publication date |
---|---|
EP1717177A2 (en) | 2006-11-02 |
EP1717177A3 (en) | 2007-08-08 |
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AS | Assignment |
Owner name: BANCTEC, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOENICH, DENNIS A.;WICKER, JAMES H.;YARRINGTON, JAMES C.;AND OTHERS;REEL/FRAME:016521/0654 Effective date: 20050425 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |