US3593988A - Sheet-feeding arrangements - Google Patents

Sheet-feeding arrangements Download PDF

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Publication number
US3593988A
US3593988A US755607A US3593988DA US3593988A US 3593988 A US3593988 A US 3593988A US 755607 A US755607 A US 755607A US 3593988D A US3593988D A US 3593988DA US 3593988 A US3593988 A US 3593988A
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US
United States
Prior art keywords
stack
sheet
top sheet
feed
edge
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.)
Expired - Lifetime
Application number
US755607A
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English (en)
Inventor
Collins
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.)
Omal Group Ltd
Original Assignee
Omal Group Ltd
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 Omal Group Ltd filed Critical Omal Group Ltd
Application granted granted Critical
Publication of US3593988A publication Critical patent/US3593988A/en
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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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/26—Supports or magazines for piles from which articles are to be separated with auxiliary supports to facilitate introduction or renewal of the pile
    • B65H1/266—Support fully or partially removable from the handling machine, e.g. cassette, drawer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6502—Supplying of sheet copy material; Cassettes therefor

Definitions

  • the magazine contains a stack of sheets and the apparatus comprises feed means for feeding each succeeding top sheet downwardly from the stack at an acute angle to a leading face of the stack across an edge of the stack so that the top sheet bows upwardly away from the next sheet in the stack to minimize the risk of adhesion between the top sheet and the next sheet as the top sheet leaves the magazine.
  • FIG 3 Pficmup C91 L/AS INVENTOR ATTORNEY SHEET-FEEDING ARRANGEMENTS This invention comprises improvements in sheet-feeding arrangements for feeding sheets from a stack thereof and concerns particularly but not exclusively such sheet-feeding arrangements for use in electrostatic copying machines.
  • a sheet of copy paper is fed from a stack through a charger in an electrostatic copying machine, the charger imparting an electrostatic charge to the sheet.
  • the prescnt'ginvention provides apparatus adapted for use in feeding sheets from a stack thereof comprising a support adapted to support a stack of sheets and feed means for feeding each succeeding top sheet downwardly fromthe stack at an acute angle to a leading face of the stack, across that edge of said face defined by the next sheet in the stack so that said top sheet bows upwardly away from the next sheet in the stack.
  • the invention also provides a method of feeding sheets from a stack thereof wherein each succeeding top sheet is fed from the stack downwardly at an acute angle to a leading face of the stack, across that edge of said face defined by the next sheet in the stack so that said top sheet bows upwardly away from the next sheet in the stack.
  • each top sheet is means is provided adapted to guide the top sheet in a concave curved path as it is fed from the stack, the guide means acting to bow the sheet-in the opposite direction to that in which it is bowed by the sheet feed means.
  • the guide means assists in bowing the sheet away from the next sheet in the stack by initially leading the sheet at the acute angle to said one side face of the stack at which it is fed from the stack by the sheet feed means. It may also have the effect of trapping a lower one of say two sheets fed forward simultaneously, in error, towards the charger.
  • the leading edge of the lower sheet tends to drop away from that, of the top sheet, into abutment with a lower guide of said guide means, so as to arrest the movement of the lower sheet, while the top sheet continues to be fed forward by the sheet feed means.
  • the separation of the sheets in this manner also prevents them adhering together by means of any electrostatic charge conducted back along the top sheet when the top sheet reaches the charging means.
  • FIG. 1 shows a schematic diagram of the electrostatic copier embodying the invention
  • FIG. 2 shows a perspective view of sheet-feeding apparatus of the copier
  • FIG. 3 shows a side view corresponding to F. G. 2.
  • the electrostatic copier embodying the invention comprises (FlG. ll) sheet-feeding apparatus ill, a charging device 12 adapted to charge a copy sheet fed thereto by the apparatus 11, with a negative electrostatic charge, a projector 14 arranged to project an image to be copied onto the charged copy sheet to provide a latent image on one side thereof, apparatus 16 adapted for use in treating the sheet bearing the latent image with a developer liquid to develop the image, and a fan 18 arranged to dry the sheet leaving the apparatus 16; the copy sheet passing the fan 18 bears a developed image and is in a finished form.
  • the path of the copy sheet through the copier is indicated by arrows in FIG. 1.
  • the charging device 12, the projector 114 and the fan 18 are of conventional construction, and details thereof form no part of the present invention per se.
  • the apparatus 16 is as described in our copending U.S. Pat. application Ser. No. 729,077, filed May 14, i968 and now abandoned, and again details thereof form no part of the present invention per se.
  • the apparatus llll (FIG. 2) comprises a cardboard magazine 20 containing a stack S of copy sheets and the apparatus is adapted for use in feeding sheets one at a time from the stack S.
  • the magazine 20 provides a relatively rigid platform 22 supporting the stack S, a rear wall 23, sidewalls 24 and a top wall 26.
  • the magazine 20 is open at the front and the platform 22 extends forwardly of the top wall 26.
  • the top sheet of the stack S is spaced below the top wall 26.
  • the platform 22 is pivoted on a fulcrum edge 28 provided by a fulcrum member 29 and extending transversely of the direction of feedjindicatcd by the arrow N; the platform .22is located on the fulcrum edge 28 by two spaced slots 30 in the platform 22 which are received over corresponding formations 31 extending upwardly from the edge 28.
  • the fulcrum member 29 provides a support for the stack S.
  • the weight of the stack S is distributed so that an edge E of the stack is yieldably urged upwardly by said weight into frictionalcontact with a pair of spaced generally D-shaped feed rollers 32 mounted side-by-side for rotation on a shaft 34 extending transversely to the direction of feed.
  • the rollers 32 are shown in an angular position in which a sheet (not shown) has been fed forward to secondary sheet feed means constituted by rollers 36, 38 and the rollers 32 are rcapproaehing their initial position ready to feed the next sheet exposed on top of the stack S.
  • the uppermost rounded corners 40 (FIG. 3) of the rollers 32 engage the exposed surface of the top sheet of the stack S adjacent the edge E, the noncircular sides of the rollers 32 then extending forwardly beyond the edge E of the stack.
  • the axis of the shaft 34 lies above the stack S'beyond the edge E thereof in the direction of feed.
  • the rollers 32 When it is required to feed the top sheet from the stack S the rollers 32 are rotated by conventional means (not shown) in the direction of the arrow G from their initial position as described, the top sheet is flicked from the stack S and fed downwardly across the edge E, which is now defined by the next sheet in the stack S, at an acute angle to the leading face of the stack, under a curved stationary guide 40a. The trailing portion of the top sheet now bows upwardly away from the next sheet in the stack S.
  • the bowed sheet is fed forward across the edge E, which is maintained in contact with the rollers 32 by the weight of the stack S acting about the fulcrum edge 28, until the leading edge of the sheet reaches a position in the nip of the rollers 36, 38 which are subsequently operated to feed the sheet into the charging device 12.
  • the change of radial distance between the edge E and the axis of the rollers 32, during rotation of the rollers 32 is accommodated by tilting of the magazine 26 on the fulcrum edge 28.
  • a stationary member 42 supports the fulcrum member 29 and provides a guide 44 confronting the guide 40a to define a curved guide passage for guiding the top sheet in a concave curved path towards the nip of the rollers 36, 38, as the sheet is fed from the stack S.
  • the guide passage is'curved upwardly over an exit portion adjacent the 36, 38 36,38 whereby the guide 44 acts to arrest the lower of two sheets which may happen to be fed forward together, as previously described.
  • Each roller 32 has a serrated flexible covering 46 so as to present triangular-sectioned flexible teeth extending transversely on their peripheral surface.
  • Apparatus for feeding sheets from a stack thereof comprising:
  • a support means for supporting a stack of sheets to expose at least a portion of the top sheet adjacent the leading edge thereof; and feed means for engaging the exposed surface of the top sheet of the stack adjacent its leading edge and for feeding each successive top sheet downwardly from the stack at an acute angle relative to a leading face of the stack, across the edge of said leading face, the edge being defined by the next sheet in the stack, to bow the top sheet of the stack upwardly away from the next sheet in the stack.
  • Apparatus according to claim 2 wherein the feed means comprises a feed roller of generally D-shaped cross section, and means for rotating the feed roller through a complete revolution.
  • the support means comprises a platform supporting the stack, and fulcrum means for pivoting the platform on an axis extending transversely to the direction of feed so that in the operation of the apparatus the weight of the stack yieldably urges the stack into said frictional contact.
  • Apparatus according to claim 5 comprising a magazine containing the stack and providing the platform.
  • Apparatus according to claim 1 comprising guide means for guiding the top sheet in a concave curved path as it is fed from the stack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US755607A 1967-09-14 1968-08-27 Sheet-feeding arrangements Expired - Lifetime US3593988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB42052/67A GB1201208A (en) 1967-09-14 1967-09-14 Improvements in sheet feeding arrangements for feeding sheets from a stack thereof

Publications (1)

Publication Number Publication Date
US3593988A true US3593988A (en) 1971-07-20

Family

ID=10422622

Family Applications (1)

Application Number Title Priority Date Filing Date
US755607A Expired - Lifetime US3593988A (en) 1967-09-14 1968-08-27 Sheet-feeding arrangements

Country Status (5)

Country Link
US (1) US3593988A (da)
DE (1) DE1786281B1 (da)
DK (1) DK122122B (da)
FR (1) FR1599771A (da)
GB (1) GB1201208A (da)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252598A (en) * 1978-05-30 1981-02-24 Polaroid Corporation Apparatus for bonding a transparent cover sheet to a photograph
US4437656A (en) 1978-08-29 1984-03-20 Canon Kabushiki Kaisha Sheet feeding device
US4438915A (en) * 1979-06-01 1984-03-27 Nippon Electric Co., Ltd. Sheet feeding device
US4515357A (en) * 1982-12-03 1985-05-07 Xerox Corporation Paddle retard feeder
US4573674A (en) * 1983-01-10 1986-03-04 Musashi Engineering Kabushiki Kaisha Device for delivery of paper sheets for an apparatus for counting the number of paper sheets
US4607832A (en) * 1985-01-28 1986-08-26 Glory Kogyo Kabushiki Kaisha Endless belt separator having an unsupported separating surface
US5078384A (en) * 1990-11-05 1992-01-07 Xerox Corporation Combined differential deskewing and non-differential registration of sheet material using plural motors
US5255903A (en) * 1991-11-12 1993-10-26 Eastman Kodak Company Sheet feed and alignment apparatus
US5687418A (en) * 1994-10-29 1997-11-11 Eastman Kodak Company Processing apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8315243D0 (en) * 1983-06-03 1983-07-06 Panorama Office Systems Ltd Document feeders

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1241897A (en) * 1917-04-04 1917-10-02 John H Ananson Paper-holder.
US1277568A (en) * 1915-12-06 1918-09-03 Tito Giardi Automatic newspaper-distributer.
US1443430A (en) * 1920-05-05 1923-01-30 Gaw O Hara Envelope Company Paper-feeding mechanism
US1445666A (en) * 1922-01-25 1923-02-20 Davis Legal-blank-vending machine
US1456562A (en) * 1918-06-27 1923-05-29 Neddo Richard Stationery cabinet
US2591727A (en) * 1950-04-07 1952-04-08 Sondon Systems Corp Ticket cartridge for copy writers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251345B (de) * 1967-10-05 Hall Harding Limited, London Vorrichtung zum Vereinzeln und Zufuhren von Bogen eines Bogenstapel zu einer Bogenverarbeitungsmaschme
GB190600085A (en) * 1906-01-01 1906-08-02 Robert Edmund Kemper Improvements in Automatic Separating and Feeding Devices for Cards, Sheets, Envelopes and the like.
US3029074A (en) * 1959-02-26 1962-04-10 Heyer Inc Sheet feed control for duplicating machines
DE1127374B (de) * 1960-05-28 1962-04-12 Hermann Schmidt Blattausgabegeraet
NL302428A (da) * 1963-01-03 1900-01-01
US3260521A (en) * 1963-08-12 1966-07-12 Minnesota Mining & Mfg Paper feed device
US3306491A (en) * 1964-10-14 1967-02-28 American Photocopy Equip Co Apparatus and structure for handling copy paper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1277568A (en) * 1915-12-06 1918-09-03 Tito Giardi Automatic newspaper-distributer.
US1241897A (en) * 1917-04-04 1917-10-02 John H Ananson Paper-holder.
US1456562A (en) * 1918-06-27 1923-05-29 Neddo Richard Stationery cabinet
US1443430A (en) * 1920-05-05 1923-01-30 Gaw O Hara Envelope Company Paper-feeding mechanism
US1445666A (en) * 1922-01-25 1923-02-20 Davis Legal-blank-vending machine
US2591727A (en) * 1950-04-07 1952-04-08 Sondon Systems Corp Ticket cartridge for copy writers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252598A (en) * 1978-05-30 1981-02-24 Polaroid Corporation Apparatus for bonding a transparent cover sheet to a photograph
US4437656A (en) 1978-08-29 1984-03-20 Canon Kabushiki Kaisha Sheet feeding device
US4438915A (en) * 1979-06-01 1984-03-27 Nippon Electric Co., Ltd. Sheet feeding device
US4515357A (en) * 1982-12-03 1985-05-07 Xerox Corporation Paddle retard feeder
US4573674A (en) * 1983-01-10 1986-03-04 Musashi Engineering Kabushiki Kaisha Device for delivery of paper sheets for an apparatus for counting the number of paper sheets
US4607832A (en) * 1985-01-28 1986-08-26 Glory Kogyo Kabushiki Kaisha Endless belt separator having an unsupported separating surface
US5078384A (en) * 1990-11-05 1992-01-07 Xerox Corporation Combined differential deskewing and non-differential registration of sheet material using plural motors
US5255903A (en) * 1991-11-12 1993-10-26 Eastman Kodak Company Sheet feed and alignment apparatus
US5687418A (en) * 1994-10-29 1997-11-11 Eastman Kodak Company Processing apparatus

Also Published As

Publication number Publication date
FR1599771A (da) 1970-07-20
GB1201208A (en) 1970-08-05
DK122122B (da) 1972-01-24
DE1786281B1 (de) 1972-04-27

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