US3731915A - Feed roll abrasion roller - Google Patents

Feed roll abrasion roller Download PDF

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Publication number
US3731915A
US3731915A US00196691A US3731915DA US3731915A US 3731915 A US3731915 A US 3731915A US 00196691 A US00196691 A US 00196691A US 3731915D A US3731915D A US 3731915DA US 3731915 A US3731915 A US 3731915A
Authority
US
United States
Prior art keywords
cylindrical member
separating
sheet
advancing
feed roll
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
US00196691A
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English (en)
Inventor
J Guenther
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
Application granted granted Critical
Publication of US3731915A publication Critical patent/US3731915A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0669—Driving devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/53—Auxiliary process performed during handling process for acting on performance of handling machine
    • B65H2301/531—Cleaning parts of handling machine

Definitions

  • ABSTRACT An apparatus in which an abrasive member is positioned in rubbing engagement with a moving separating and advancing means of a sheet forwarding mechanism to retain a preselected frictional force between the separating and advancing means and successive single sheets for permitting the efficient separation and advancement thereof.
  • This invention relates to an apparatus for maintaining a sheet forwarding mechanism in condition to efficiently separate and advance a sheet from a stack of sheets, and more particularly concerns an apparatus for engaging the moving separating and advancing means of the sheet forwarding mechanism to retain a preselected frictional force between the separating and advancing means and each successive sheet to be forwarded therefrom.
  • a sheetmaterial such as paper
  • the paper is of a predetermined size which advances through the copier, one sheet at a time, for suitable processing therein.
  • a conventional sheet forwarding mechanism is equipped with a tray member that supports a stack of sheets, separator elements at the forward end of the tray member, and a feeding mechanism having one or a plurality of rotatable feed rolls for separating and advancing the paper.
  • the feed rolls engage the surface of the sheet to be separated and advanced from the stack.
  • a frictional force is applied to the sheet of paper which separates and advances the sheet from the remainder of the stack.
  • the surface of the feed roll engaging successive sheets must have a coefficient of friction which is sufficiently high to separate and advance successive sheets therefrom. Generally, if the coefficient of friction of feed roll surface is within a preferable range, the feed roll will operate efficiently. However, after prolonged usage the feed roll surface gradually becomes progressively smoother.
  • Progressive glazing of the feed roll surface is the primary factor in reducing the coefficient of friction thereof. Glazing of the feed roll surface is usually produced by contamination or waste material becoming embedded therein. In office copiers, such as xerographic machines, the contaminants usually are in the form of paper fibers, e.g., titanium dioxide, a paper whitener, and/or toner particles. When, due to glazing, the coefficient of friction has decreased below the critical value, the feed roll starts to slip and eventually fails to perform the sheet separation and advancement function satisfactorily.
  • Feed roll deterioration is due, primarily, to the reaction of the natural rubber with ozone which is normally present in xerographic copiers requiring high electrostatic fields in the operation thereof. Although the amount of ozone produced is relatively low, it nevertheless is sufficient, after a period of time, to harm the feed roll.
  • the apparatus includes an abrasive member mounted movably in a support member.
  • the support member is adapted to move the abrasive member into rubbing engagement with the outer surface portion of the separating and advancing means.
  • the abrasive member maintains the outer surface potion of the separating and advancing means substantially free from contamination and at about a constant roughness to retain the preselected frictional force between each successive sheet and the separating and advancing means. This insures that each sheet is efficiently separated and advanced during the useful life of the mechanism.
  • FIGURE illustrated is a perspective view depicting the apparatus for maintaining the separating and advancing means of the sheet forwarding mechanism at substantially a constant roughness.
  • a sheet forwarding mechanism is illustrated as having an abrasive member therein for maintaining a preselected frictional force between the feed rolls thereof and successive sheets to be forwarded thereby.
  • the abrasive member continuously engages the surface of the feed rolls to remove contaminants and maintain the roughness substantially constant during the operation of the sheet forwarding mechanism. This, in turn, insures that there is no slippage and successive sheets are separated and advanced from the sheet forwarding mechanism.
  • the sheet forwarding apparatus includes a tray member,
  • Feed rolls 14 and 16 are mounted in cooperating relationship with one another in front of tab members 24 and 26 which assist in separating the forwardly moving paper from the remainder of stack 28.
  • Feed rolls l4 and 16 advance the uppermost sheet of stack 28 over tab members 24 and 26, and between forwarding rolls 20 and 22, until the leading edge potion of the forwarded sheet engages registration member 18. This is achieved by a suitable endless belt or chain drive 30 which rotates cam 32 in the direction of arrow 34.
  • Sector gear 36 is resiliently maintained in engagement with cam 32 by means of a suitable spring member 38.
  • Cam 32 drives sector gear 36 in an oscillating fashion as indicated by arrow 37.
  • Sector gear 36 meshes with pinion gear 40 to rotate pinion gear 40 in counter clockwise and clockwise directions. Since pinion gear 40 and feed rolls 14 and 16 are secured to common shaft 42, feed rolls 14 and 16 rotate in conjunction with pinion gear 40 as indicated by arrow 44. Feed rolls 14 and 16 are in intermittent rotation, and are adapted to engage the uppermost sheet of stack 28 disposed in tray member 12.
  • Tray member 12 includes a pivotable base plate 46 on which the stack 28 is disposed. Base plate 46 is adapted to pivot so that the uppermost sheet of stack 28 engages feed rolls l4 and 16.
  • Drive 30 rotates shaft 48 having cam 50 mounted thereon.
  • Cam 50 drives cam follower 52, which is mounted on a common shaft 54 with tab members 24 and 26.
  • Tab members 24 and 26, thereby, pivot in synchronism with feed rolls l4 and 16 to engage and disengage the uppermost sheet of stack 28 at the appropriate time, i.e., shaft 54 rotates in both a clockwise and counter clockwise direction as indicated by arrow 56.
  • Forwarding roll 22 is rotated by a suitable drive (not shown).
  • Cam 58 drives cam follower 60, which, in turn, causes connecting link 62 having shaft 66 and shaft 68 affixed thereto, to pivot in the direction of arrow 64.
  • shaft 66 which has forwarding roll 20 mounted thereon, is adapted to move forwarding roll 20 into and out of en'- gagement with an advancing sheet passing over forwarding roll 22.
  • the advancing sheet moves between the closely spaced forwarding rolls 20 and 22, and the leading edge potion engages registration member 18,
  • Registration member 18 is adapted to move in upwardly and downwardly directions, as indicated by arrow 39.
  • Link 62 pivots to move forwarding roller 20 downwardly into engagement with the advancing sheet, and simultaneously therewith, registration member 18 downwardly to disengage the leading edge potion of the advancing sheet therefrom.
  • the sheet is, thereupon, transferred from the sheet forwarding apparatus 10. It will be appreciated that the operation of the sheet forwarding apparatus is controlled by driving means 30, which, in turn, is controlled by a suitable timing apparatus to insure the proper sequential advancement of the forwarded sheets.
  • tray member 12 includes a gate member 13 mounted pivotably thereon at one end thereof via hinge pin 15.
  • Gate member 13 is adapted to pivot about 3 or 4 in substantially a counter clockwise direction into engagement with feed rolls 14 and 16.
  • Apparatus 70 for engaging feed rolls 14 and 16 to maintain surfaces 14a and 16a, respectively, at a substantially constant roughness and to remove contaminants therefrom. This, in turn, insures that the frictional force between successive sheets and feed rolls l4 and 16 remains at about the preselected value.
  • Apparatus 70 includes a support member, indicated generally at 71, and an abrasive member, designated generally at 78.
  • Support member 71 has a shaft 72 mounted in sheet forwarding apparatus 10, and a pair of coupling members 74 and 76 attached pivotably to shaft 72.
  • Coupling members 74 and '76 have abrasive member 78 interposed therebetween and mounted rotatably therein.
  • Abrasive member 78 includes shaft 77 interposed between and mounted rotatably on coupling members 74 and 76.
  • Shaft 77 comprises a cylindrical member 80 having frictional means 82, such as a coating of sandpaper, affixed thereon.
  • biasing means 84 for example, a coil spring, is adapted to prevent cylindrical member 80 from rotating in one direction while permitting cylindrical member 80 to rotate in the other direction.
  • Coil spring 84 has one end thereof attached to coupling member 74 and is wound about shaft 77 with the other end thereof attached to cylindrical member 80.
  • Spring 84 is prewound and yieldingly prevents feed rolls 14 and 16 from rotating abrasive member 78 in one direction. However, abrasive member 78 is free to rotate in the opposed direction. In this manner feed rolls l4 and 16 abrasively slide over sandpaper coating 82 to remove contaminants therein and maintain the roughness thereof substantially constant. Spring coil 84 is prewound such that cylindrical member 80 rotates freely when feed rolls 14 and 16 rotate counter clockwise to buckle the uppermost sheet of stack 28 for separation thereof while it yieldingly prevents rotation of cylindrical member 80 when feed rolls l4 and 16 rotate in a clockwise direction to advance the uppermost sheet of stack 28 therefrom.
  • coupling members 74 and 76 are mounted pivotably on shaft 72. In this manner, coupling members 74 and 76 having cylindrical member 80 interposed therebetween are pivoted in substantially a downwardly direction under the force of gravity to locate sandpaper coating 82 in engagement with surface portions and 16a of feed rolls l4 and 16, respectively.
  • sandpaper coating 82 abrades surface portions 140 and 16a of the respective feed rolls 14 and 16 and prevents glazing of these surfaces.
  • the deleterious deterioration of the feed roll caused by ozone is minimized by the continuous removal of material therefrom by abrasive member 78.
  • the feed rolls are preferably an elastomer such as natural rubber, synthetic rubber or Mearthane, and have a coefficient of friction preferably ranging from about 2.36 to about 2.97.
  • the sandpaper coating 82 affixed to cylindrical member 80 minimizes the amount of material removed from the natural rubber feed roll while insuring that the coefficient of friction is maintained substantially constant.
  • An appropriate grit sandpaper must be judiciously selected.
  • An inappropriate selection such as type 325 sandpaper coating causes a diameter decrease of about 0.014 inches in the feed rolls after forwarding 25,000 sheets, or 0.070 inches thereof after forwarding 125,000 sheets.
  • the biasing means or coil spring 84 is prewound, in this way, when feed rolls l4 and 16 rotate in a counter clockwise direction to buckle the uppermost sheet of stack 28, the spring is unwound and there is no rubbing action on feed rolls l4 and 16.
  • coil spring 84 is wound and yieldingly prevents cylindrical member 80 from rotating. Thus, under these circumstances, there is a rubbing action between sandpaper coating 82 and feed rolls 14 and 16.
  • coil spring 84 should have an inner diameter of 0.371 inches; a wire diameter of 0.020 inches; and a free length of 0.130 inches with about four turns.
  • the spring depicted in the drawing is right handed. While the invention has been described in connection with a coil spring, one skilled in the art will appreciate that the invention is not necessarily so limited and that other suitable means such as a retractable stop pin may be provided for preventing the cylindrical member from rotating in one direction while permitting the cylindrical member to rotate in the opposite position.
  • the present invention maintains a preselected frictional force between the feed rolls and each successive sheet to be advanced by removing contamination such as paper fibers and/or toner particles embedded therein and maintaining the roughness thereof substantially constant. Moreover, due to the intermittent rubbing of the surface of the feed rolls, ozone is less likely to penetrate the surface thereof and damage the feed rolls. Hence the apparatus. of the present invention has been found to substantially increase the useful life of natural rubber feed rolls.
  • An apparatus for forwarding successive sheets from a stack of sheet material in a storage compartment including:
  • biasing means for yieldingly preventing said cylindrical member from rotating in one direction while permitting said cylindrical member to rotate in the opposed direction, the rubbing of said cylindrical member against said separating and advancing surface when said cylindrical member is substantially prevented from rotating maintaining the roughness of said separating and advancing means substantially constant to retain about a preselected frictional force between said separating and advancing means and each successive sheet permitting continuously efficient separation and advancement thereof.
  • An apparatus for maintaining the peripheral surface portion of a rotatable feed roll used in a sheet forwarding mechanism at about a preselected surface finish including:
  • biasing means for yieldingly preventing said cylindrical member from rotating in one direction while permitting said cylindrical member to rotate in the opposed direction the rubbing of said cylindrical member against said feed roll when said cylindrical member is substantially prevented from rotating maintaining the roughness of the feed roll substantially constant to retain about a preselected frictional force between the feed roll and each successive sheet permitting continuously efficient separation and advancement thereof.
  • An apparatus for seriatim feeding of sheets from a stack of sheet material housed in a storage compartment including:
  • an abrasive roller mounted rotatably on said support member, said support member being movable to position said abrasive roller in continuous engagement with the outer surface portion of said separating and advancing means;
  • control means for controlling the rotation of said abrasive roller relative to said separating and advancing means, said control means being adapted to substantially prevent said abrasive roller from rotating in one direction while permitting said abrasive roller to rotate in the opposed direction, said abrasive roller, when substantially prevented from rotating sliding abrasively over the outer surface portion of said separating and advancing means, thus maintaining the roughness of said separating and advancing means substantially constant to retain about a preselected frictional force between said separating and advancing means and each successive sheet permitting continuously efficient separation and advancement thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
US00196691A 1971-11-08 1971-11-08 Feed roll abrasion roller Expired - Lifetime US3731915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19669171A 1971-11-08 1971-11-08

Publications (1)

Publication Number Publication Date
US3731915A true US3731915A (en) 1973-05-08

Family

ID=22726443

Family Applications (1)

Application Number Title Priority Date Filing Date
US00196691A Expired - Lifetime US3731915A (en) 1971-11-08 1971-11-08 Feed roll abrasion roller

Country Status (11)

Country Link
US (1) US3731915A (enrdf_load_stackoverflow)
JP (1) JPS5612585B2 (enrdf_load_stackoverflow)
AR (1) AR194272A1 (enrdf_load_stackoverflow)
BE (1) BE791064A (enrdf_load_stackoverflow)
BR (1) BR7207646D0 (enrdf_load_stackoverflow)
CA (1) CA966518A (enrdf_load_stackoverflow)
DE (1) DE2249475A1 (enrdf_load_stackoverflow)
FR (1) FR2160088A5 (enrdf_load_stackoverflow)
GB (1) GB1389426A (enrdf_load_stackoverflow)
IT (1) IT970223B (enrdf_load_stackoverflow)
NL (1) NL7213337A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374619A (en) * 1981-11-02 1983-02-22 Xerox Corporation Variable magnification copying apparatus
EP0065306A3 (en) * 1981-05-18 1983-06-15 Irodagepipari Es Finommechanikai Vallalat Sheet feeding device for a copying machine
US4889331A (en) * 1984-11-23 1989-12-26 Prime Technology, Inc. Rotary-type feeder machines and methods
US4928950A (en) * 1984-11-23 1990-05-29 Sardella Louis M Rotary type feeder machines and methods
US5120042A (en) * 1988-06-22 1992-06-09 Ikegami Tsushinki Co., Ltd. Document sheet feeder
US5224698A (en) * 1991-02-22 1993-07-06 Kabushiki Kaisha Toshiba Apparatus for feeding sheet-like object
NL1010934C2 (nl) * 1998-12-31 2000-07-03 Neopost Bv Inrichting voor het separeren van vellen.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57209136A (en) * 1981-06-17 1982-12-22 Fuji Xerox Co Ltd Preventive device for paper powder adherence to paper feed roller in copying machine
JPS58135743U (ja) * 1982-03-05 1983-09-12 大日本スクリ−ン製造株式会社 自動現像機における搬送ロ−ラの洗浄装置
CA3029388C (en) 2016-06-27 2022-09-06 Japan Tobacco Inc. Cartridge for aerosol inhaler, aerosol inhaler provided with same, and heat-generating sheet for aerosol inhaler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US984273A (en) * 1910-06-11 1911-02-14 Theophile W Hebert Paper-feeding mechanism.
US1668967A (en) * 1923-04-03 1928-05-08 Harold S Labombarde Blank feeder
US1956475A (en) * 1927-01-04 1934-04-24 Johnson Automatic Sealer Co Lt Blank feeding mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4310823Y1 (enrdf_load_stackoverflow) * 1965-07-12 1968-05-11
JPS493116A (enrdf_load_stackoverflow) * 1972-03-25 1974-01-11

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US984273A (en) * 1910-06-11 1911-02-14 Theophile W Hebert Paper-feeding mechanism.
US1668967A (en) * 1923-04-03 1928-05-08 Harold S Labombarde Blank feeder
US1956475A (en) * 1927-01-04 1934-04-24 Johnson Automatic Sealer Co Lt Blank feeding mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065306A3 (en) * 1981-05-18 1983-06-15 Irodagepipari Es Finommechanikai Vallalat Sheet feeding device for a copying machine
US4374619A (en) * 1981-11-02 1983-02-22 Xerox Corporation Variable magnification copying apparatus
US4889331A (en) * 1984-11-23 1989-12-26 Prime Technology, Inc. Rotary-type feeder machines and methods
US4928950A (en) * 1984-11-23 1990-05-29 Sardella Louis M Rotary type feeder machines and methods
US5120042A (en) * 1988-06-22 1992-06-09 Ikegami Tsushinki Co., Ltd. Document sheet feeder
US5224698A (en) * 1991-02-22 1993-07-06 Kabushiki Kaisha Toshiba Apparatus for feeding sheet-like object
NL1010934C2 (nl) * 1998-12-31 2000-07-03 Neopost Bv Inrichting voor het separeren van vellen.
EP1016612A1 (en) * 1998-12-31 2000-07-05 Neopost B.V. Apparatus for the separation of sheets
US6450494B1 (en) 1998-12-31 2002-09-17 Neopost B.V. Apparatus for the separation of sheets
US6474636B2 (en) 1998-12-31 2002-11-05 Neopost B.V. Apparatus for the separation of sheets

Also Published As

Publication number Publication date
NL7213337A (enrdf_load_stackoverflow) 1973-05-10
BR7207646D0 (pt) 1973-09-25
CA966518A (en) 1975-04-22
JPS4855741A (enrdf_load_stackoverflow) 1973-08-04
AR194272A1 (es) 1973-06-29
IT970223B (it) 1974-04-10
FR2160088A5 (enrdf_load_stackoverflow) 1973-06-22
JPS5612585B2 (enrdf_load_stackoverflow) 1981-03-23
GB1389426A (en) 1975-04-03
DE2249475A1 (de) 1973-05-10
BE791064A (fr) 1973-05-08

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