EP0532343A1 - Appareil pour transport de feuilles avec alignement latéral de feuilles - Google Patents

Appareil pour transport de feuilles avec alignement latéral de feuilles Download PDF

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Publication number
EP0532343A1
EP0532343A1 EP92308288A EP92308288A EP0532343A1 EP 0532343 A1 EP0532343 A1 EP 0532343A1 EP 92308288 A EP92308288 A EP 92308288A EP 92308288 A EP92308288 A EP 92308288A EP 0532343 A1 EP0532343 A1 EP 0532343A1
Authority
EP
European Patent Office
Prior art keywords
sheet
sensor
feeding
laterally
shifting
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.)
Granted
Application number
EP92308288A
Other languages
German (de)
English (en)
Other versions
EP0532343B1 (fr
Inventor
Michael Barry Thomson
Paul Theobald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of EP0532343A1 publication Critical patent/EP0532343A1/fr
Application granted granted Critical
Publication of EP0532343B1 publication Critical patent/EP0532343B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/26—Registering devices
    • B41J13/30—Side lays or gauges
    • 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
    • B65H7/10—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 incorrect side register
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/142—Roller pairs arranged on movable frame
    • B65H2404/1424—Roller pairs arranged on movable frame moving in parallel to their axis
    • 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
    • B65H2511/20—Location in space
    • B65H2511/24—Irregularities, e.g. in orientation or skewness
    • 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
    • B65H2511/515—Absence

Definitions

  • This invention relates to a sheet feeding apparatus which is particularly, although not exclusively, useful in a copier or printer such as a xerographic copier or printer.
  • the present invention is concerned with the lateral registration of sheets in a sheet feeding apparatus.
  • a number of devices for lateral shifting and registration of sheets are known, such as the lateral sheet shifting or offsetting mechanisms of US-A-4 712 786 and US-A-4 480 825.
  • a printing apparatus includes a sorter and an offsetting device.
  • the offsetting device is positioned within the printer and is adapted to translate sheets en route to the sorter alternately front and rearward such that sheets are offset before they are driven into the sorter with subsequent sheet sets being offset from each other within bins of the sorter.
  • An apparatus for separating sets of copy sheets from a copier is disclosed in US-A-4 480 825 that includes a mechanism that delivers alternate sets of sheets to a stationary tray along overlapping laterally spaced paths. Sheets are fed first through a transversely fixed assembly of opposing feed rollers and then through a second, transversely movable assembly of feed rollers into a stacking tray. Sheets belonging to alternate sets are offset by shifting the second set of rollers laterally.
  • US-A-4 823 159 discloses a lateral shifting and registration arrangement in which the sheet is fed between two co-operating nip rollers which are stopped with the sheet still in the nip between them and shifted laterally until an edge of the sheet is detected by a sensor. The sheet is then registered laterally of the process direction and may be fed to the next stage in its process by rotation of the rollers. In this way, the sheet can be registered laterally while it is still held the nip in between the rollers. After each sheet has been fed out of the rollers, the roller assembly is shifted in the opposite lateral direction to the registration direction, back to a "home" position.
  • the present invention is intended to meet this need, and accordingly provides a sheet feeding apparatus including feeding means for feeding sheets in a process direction and registration means for registering each sheet in a direction laterally of the process direction, the registration means comprising shifting means for laterally shifting the feeding means, a sensor arranged to provide a signal on detecting the presence of a sheet, and control means to control the lateral shifting means in response to said signal, characterised in that the control means is arranged such that if the sheet is not detected by the sensor on initial entry of the sheet into the feeding means the shifting means is activated to move the feeding means laterally towards the sensor until the sheet is detected by the sensor whereupon said lateral movement is stopped, or if the sheet is detected on initial entry of the sheet into the feeding means the shifting means is first activated to move the feeding means laterally away from the sensor until the sensor no longer detects the sheet and is then activated to move the feeding means towards the sensor as aforesaid.
  • the apparatus of the invention has the advantage that it can accommodate wide range of sheet positions as the sheet enters the device, on either side of a desired registration position. Whatever the initial sheet position, the device will always register the sheet in the same direction, thereby eliminating any inconsistencies due to backlash or hysteresis in the system.
  • a xerographic laser printer 10 produces prints, or copies, of input information in electronic form, typically derived from documents.
  • the electronic input information in digital form, is processed by an electronic sub-system (ESS) 11, and is used to modulate a scanning light beam 12, produced by a laser, in a raster output scanner (ROS) 13.
  • ESS electronic sub-system
  • ROS raster output scanner
  • the photoreceptor is uniformly electrostatically charged and moved past a slit in the underside of the cassette 14.
  • the beam 12 is scanned across the slit to form an electrostatic latent image on the photoreceptor by selectively discharging the uniform charge where light falls on it.
  • the electrostatic latent image is developed with toner particles which adhere selectively to the latent image in the same configuration as the image, and the developed image is transferred, at transfer station 15, to a sheet of paper.
  • the paper sheet, carrying the developed image then passes through a fuser 16, consisting of a heated roller and a co-operating back-up roller, to fuse the image to the paper sheet, forming a permanent print or copy.
  • the copy may then be transported into one of two output trays, as will be described in more detail below, or be returned, in a duplex imaging mode, to the xerographic cassette to receive a further developed image on its second side.
  • Paper sheets to receive the developed images are fed out of any one of four trays 21, 22, 23 and 24, with the different trays being capable of containing different sizes and different numbers of sheets.
  • tray 21 is a high capacity tray for containing the size of sheet most often used in the printer, for example A4 sheets.
  • Trays 22 and 23 will accommodate larger sizes, and tray 24 may be used, for example, to contain special sheets such as coloured sheets or transparencies.
  • Sheets are fed out of the trays 21, 22, 23 and 24 by respective sheet feeders 31, 32, 33 and 34, then by transport rollers through converging sheet paths until the sheet fed from any one of the four trays is feed by common fed roller pair 25 into the xerographic cassette 14 at transfer station 15. The sheet carrying the developed image then passes through fuser 16.
  • the further progress of a copy sheet through the machine depends on whether a simplex (one-sided) or duplex (two-sided) copy is being made. If a simplex copy is being made, the sheet follows upper paper path 26 after passing through transport rollers 27, 28. The sheet may then travel upwardly around sheet path 30, to be deposited in the top output tray 35, or it may proceed substantially horizontally along a path 36 to an inverter drum 37 before being deposited on the receiving tray of a high capacity stacker 38. A suitable sheet deflector is provided at point 29 so that the sheet passes along the chosen one of sheet paths 30 and 36.
  • the sheet carrying its first-side image passes through transport rollers 27, 28 as before, but is deflected at point 39 along a lower sheet path 40 towards a pair of reversing rollers 41, 42.
  • the reversing rollers 41, 42 are stopped, and rotated in the opposite sense so as to refeed the sheet along a return paper path 45 from which it passes between transport rollers 28 and 46 to join the paper path normally followed by sheets initially fed from uppermost tray 24.
  • the sheet then passes through common feed rollers 25 to receive a developed image on its other side at transfer station 15 of xerographic cassette 14. Thereafter, the duplex copy follows the upper paper path 26 as already described, with the option of feeding the sheet out into the top output tray 35, or the high capacity stacker 38.
  • rollers 41 or 42 are driven so that, in co-operating with each other, they drive a sheet 50 in the direction of arrow 51 until a major portion of the sheet has passed between the rollers.
  • the rollers are then stopped, and the sheet registered laterally as will be described below.
  • the rollers are then reversed to drive the sheet back towards the xerographic cassette as described above.
  • Lateral registration of the sheet is achieved by movement of a carriage 52 which carries the rollers 41 and 42, the carriage being driven laterally of the process direction by a motor 53.
  • the carriage Before each sheet of the paper is fed into the rollers 41, 42, the carriage is moved to a "home" position by motor 53, the home position being detected by a home position sensor 54.
  • the carriage 52 is moved to the right if the home sensor 54 can see the carriage, or to the left if the sensor is clear.
  • the motor 53 is stopped, and the carriage is in its home position.
  • a sheet of paper then enters the rollers 41, 42, and can be in any of a wide range of lateral position, as indicated by the extreme positions indicated in broken outline at 55 and 56.
  • the rollers stop. If, at this point, a sheet edge sensor 57 cannot see the sheet, then the motor 53 is energised to move the carriage, and hence the rollers carrying the sheet, to the left. When the sensor 57 changes state, the motor is stopped, and the sheet is registered.
  • the motor 53 is energised to move the carriage to the right until the sensor no longer sees the paper sheet, at which point the motor 53 is reversed and the carriage is moved to the left.
  • the edge sensor 57 changes state, the motor is stopped, and the sheet is registered.
  • the registration system of the invention provides an accurate, reliable, and inexpensive way of registering sheets, whether in a reversing roller arrangement, as described, or in any other situation where a sheet needs to be registered laterally of its process direction.
  • the approaching sheet can be positioned over a wide range of lateral positions, such that the edge of the sheet may or may not be sensed initially by the edge sensor 57. This arrangement is very economical on space within the machine.

Landscapes

  • Registering Or Overturning Sheets (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Manual Feeding Of Sheets (AREA)
EP92308288A 1991-09-11 1992-09-11 Appareil pour transport de feuilles avec alignement latéral de feuilles Expired - Lifetime EP0532343B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9119488 1991-09-11
GB919119488A GB9119488D0 (en) 1991-09-11 1991-09-11 Sheet feeding apparatus with lateral registration

Publications (2)

Publication Number Publication Date
EP0532343A1 true EP0532343A1 (fr) 1993-03-17
EP0532343B1 EP0532343B1 (fr) 1997-01-02

Family

ID=10701291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92308288A Expired - Lifetime EP0532343B1 (fr) 1991-09-11 1992-09-11 Appareil pour transport de feuilles avec alignement latéral de feuilles

Country Status (4)

Country Link
EP (1) EP0532343B1 (fr)
JP (1) JPH05286609A (fr)
DE (1) DE69216332T2 (fr)
GB (1) GB9119488D0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708046A1 (fr) * 1994-10-21 1996-04-24 Maschinenfabrik Gietz Ag Dispositif de répérage et d'alimentation de feuilles
EP0752310A3 (fr) * 1994-12-21 1997-09-10 Otto Kunzi Margeur pour des imprimeuses et des machines de lacquage de tÔles
EP1882594A1 (fr) * 2006-07-27 2008-01-30 Ricoh Company, Ltd. Appareil de formation d'images capable de fournir un alignement latéral
CN107720354A (zh) * 2016-08-10 2018-02-23 富士施乐株式会社 运输监控控制装置和成像设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106395450A (zh) * 2016-08-30 2017-02-15 安徽省中阳管业有限公司 一种防偏移的钢带放卷机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114393A1 (fr) * 1983-01-20 1984-08-01 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour l'alimentation exacte de feuilles dans des machines à traiter des feuilles
US4805892A (en) * 1988-04-04 1989-02-21 Eastman Kodak Company Cross-track registration device for sheet transport system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049948A (en) * 1988-12-22 1991-09-17 Xerox Corporation Copy sheet de-registration device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114393A1 (fr) * 1983-01-20 1984-08-01 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour l'alimentation exacte de feuilles dans des machines à traiter des feuilles
US4805892A (en) * 1988-04-04 1989-02-21 Eastman Kodak Company Cross-track registration device for sheet transport system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708046A1 (fr) * 1994-10-21 1996-04-24 Maschinenfabrik Gietz Ag Dispositif de répérage et d'alimentation de feuilles
US5718057A (en) * 1994-10-21 1998-02-17 Maschinenfabrik Gietz Ag Register draw-in device
EP0752310A3 (fr) * 1994-12-21 1997-09-10 Otto Kunzi Margeur pour des imprimeuses et des machines de lacquage de tÔles
EP1882594A1 (fr) * 2006-07-27 2008-01-30 Ricoh Company, Ltd. Appareil de formation d'images capable de fournir un alignement latéral
US8205878B2 (en) 2006-07-27 2012-06-26 Ricoh Company, Ltd. Image forming apparatus capable of providing side registration
CN107720354A (zh) * 2016-08-10 2018-02-23 富士施乐株式会社 运输监控控制装置和成像设备

Also Published As

Publication number Publication date
GB9119488D0 (en) 1991-10-23
EP0532343B1 (fr) 1997-01-02
JPH05286609A (ja) 1993-11-02
DE69216332D1 (de) 1997-02-13
DE69216332T2 (de) 1997-07-10

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