US3434710A - Sheet handling apparatus - Google Patents

Sheet handling apparatus Download PDF

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Publication number
US3434710A
US3434710A US586474A US3434710DA US3434710A US 3434710 A US3434710 A US 3434710A US 586474 A US586474 A US 586474A US 3434710D A US3434710D A US 3434710DA US 3434710 A US3434710 A US 3434710A
Authority
US
United States
Prior art keywords
sheet
finger
path
travel
roller
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
US586474A
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English (en)
Inventor
Norman L Yarger
Robert H Liva
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
Priority claimed from US586490A external-priority patent/US3405564A/en
Application granted granted Critical
Publication of US3434710A publication Critical patent/US3434710A/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
    • G03G15/6529—Transporting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/522—Projection optics
    • G03B27/525—Projection optics for slit exposure
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/28—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning
    • G03G15/30—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning in which projection is formed on a drum

Definitions

  • the sheets are prevented from buckling by inserting in the path of movement of the sheets a member that extends into the path of travel of the sheets and causes sheets passing the point where the member protrudes into the path of travel to bow adding beam strength to the sheet thus providing them with subsantial rigidity.
  • This invention relates to sheet transport devices and particularly to apparatus for preventing the buckling of flexible sheets.
  • Buckling of the sheets being deposited in the copy tray will cause succeeding sheets to be misaligned and perhaps fed, not into, but over and out of the depository tray as they slide over the previous buckled sheet causing a paper jam.
  • Another object of this invention is to prevent the buckling of sheets under the force of gravity.
  • Yet another object of this invention is to impart a rigidity to a flexible sheet for prevention of buckling of the sheet.
  • a further object is to impart a beam strength to a sheet While preventing its creasing.
  • Still another object of this invention is to insure that flexible sheets will not buckle or invert when delivered to a depository tray.
  • FIG. 1 is a side view, partly in section, of a sheet transport mechanism and depository tray
  • FIG. 2 is a side view of a buckler finger in conjunction with a pair of pinch rollers
  • FIG. 3 is a side view of another embodiment of a buckler finger in conjunction with a pair of pinch rollers.
  • FIG. 4 is a front view of a sheet transport apparatus embodying this invention.
  • FIG. 1 a sheet transport device of the type that would be found within the super structure 8 of an office copier type machine. It is comprised of guides and pinch rollers the latter being driven by a suitable drive means and belts and gear connections (not shown).
  • the apparatus functions to bring flexible sheet material from a previous operation to be deposited in the sheet holder 10.
  • the sheet is carried by sets of pinch rollers 12, 14, 16 and 18, all formed of metal in a cylindrical shape and plates 20, 22, and 24 used to guide the lead edge of the sheet transported therethrough to the next set of pinch rollers and finally out of the transport mechanism.
  • the rollers are journaled in the frames of the super structure 8 supporting the transport section and are free to rotate in a direction to carry the sheet from a previous operation to a next operation, such as deposition in the sheet holder 10.
  • the rotation of each set is accomplished by suitable belts and gears attached to a drive motor (not shown). Only one roller of each set is driven while the other rotates due to friction against the O-rings, such as O-ring 34, of the driver roller.
  • the guide plates 20 through 24 are formed and spaced to prevent buckling of the sheet as it is pushed by the rollers into contact with the guides.
  • the guides may be formed by stamping and have attached thereto, either as an integral part thereof or in some other manner fastened thereon, brackets such as those indicated by reference numeral 26.
  • the brackets may be fastened to the transport super structure 8 by any means such as screws 28.
  • the last set of pinch rollers in the super structure 8 is comprised of a lower drive roller .30 formed in a cylindrical shape and connected with a shaft 32 appropriately attached to drive belts connected to a motor causing the rotation of said lower drive pinch roller 30 in a counterclockwise motion as viewed from the right-hand side of the super structure as shown in FIG. 1.
  • the roller 30 has several notches placed therein along its axis, the notches running normal to the axis around the circumference of the roller. Into these several notches are forced resilient O-rings such as O-ring 34. These O-rings maintain a tight non-slippage bond with the roller 30 and a low pressure contact with the upper idler roller 36 of the last set of pinch rollers.
  • the idler roller is driven in a clockwise rotation, as viewed in FIG. 1, when the lower roller 30 is driven.
  • the idler roller 36 rests on the O-rings positioned on the roller 30 by the force of gravity due to its own weight.
  • Its shaft 38 is journaled through the super structure 9 in such a manner that a body of the roller 26 may maintain its touching contact with the O-rings 34.
  • the upper idler roller 36 is formed of a metal cylinder.
  • the roller 36 is divided approximately at its linear midpoint and turned or otherwise formed to permit a groove thereat.
  • the shafts 32 and 38 are positioned within the super structure 8 such that the center notch in the drive roller 30 and the grooved portion in the roller 36 approximately coincide.
  • a buckler finger 42 is fastened to the super structure 8 by hinge 44 such that the finger 42 may rotate in a vertical direction.
  • the finger is further positioned to lie between rollers 30 and 36 in the area of the groove on roller 36.
  • the finger is generally arcuate in shape and extends from its hinge point, above and behind (relative to the path of travel of a sheet) the axis of rollers 30 and 36 extending through the portion therebetween, where notch 40 and the division of roller 36 coincide, to a point in front of the rollers and below the path that would be traveled by a sheet guided through the trans port system.
  • a protrusion 46 appended to the finger 42 and extending rearward therefrom within the super structure 8 (see FIG. 1).
  • an adjustable spring arm 48 capable of exerting an upward force on the protrusion 46 (see FIG. 1) which in turn operates on finger 42 as a lever system the pivot point of which is at hinge 44.
  • the force exerted causes the finger 42 to be biased downward toward roller 30 and below the tangent line which may be drawn through the contact points of the rollers 30 and 36 which would represent the path of a sheet traveling therethrough.
  • the spring arm 48 is adjustable by moving clamp 50 relative to the spring arm pivot point 52 where the spring arm 48 is attached to the super structure 8.
  • a sheet for example sheet 54
  • the pinch rollers and guide plates positioned therein As a sheet, for example sheet 54, is transported through the super structure 8 by the pinch rollers and guide plates positioned therein, it is brought to, and carried through, the rollers 30 and 36 until its lead edge contacts the lower arcuate surface of the finger 42.
  • the rollers continue to drive the sheet forward, the lead edge in contact with the finger 42 is depressed or buckled therebeneath and so remains throughout the drive thereunder.
  • the passage of the sheet under the finger 42 causes an upward force on said finger and it is moved vertically upward to some extent, depending upon the bias put thereon, by spring 46 and spring arm 48.
  • This bias may be adjusted by the adjusting clamp 50 so that the sheet 54 is depressed downward at its contact point with finger 42 to impart a sufficient force on the sheet to maintain it in a rigid state while it is expelled from the transport super structure 8.
  • the force must not be so much as to crease the sheet along its line of contact with finger 52.
  • tensile stress tensile strain E Youngs modulus force/area change of length/ original length force original length area X change of length and a severe anti-stiffness effect as the same is increased; therefore, making it more diflicult to prevent buckling as more of a sheet passes the pinch rollers 34 and 36.
  • an exponential increase in stiffness may be imparted to the sheet by increasing the effective thickness T by inducing a deflection across the cross-section as is accomplished by this apparatus.
  • a downward bias is achieved on finger 42 by means of a protrusion 62 attached thereto and extending on the same side of an imaginary vertical line passed through pivot point 64 around which the finger 42 may vertically rotate.
  • the protrusion 62 may be of a heavier material than the finger 42 or it may be formed of the same material but weighted in such a manner that it creates a moment arm in relation to the pivot point 64 forming a lever with point 64 as its fulcrum and exerting a downward force on the finger 42, such force directly related to its weight and the distance thereof from the fulcrum point.
  • the surface of finger 42 which is contacted by the transported sheet should be a smooth, low friction surface formed not only to deflect the sheet as required for achieving the desired anti-buckle results but also to guide the sheet and prevent its catching on the finger and moving out of its predetermined path of rising along the lower surface toward the hinge for example.
  • the copy tray is back leaning in relation to the transport system. That is to say it is tilted from the horizontal rearward wtih its forward portion being at a point vertically higher than its most rear portion.
  • the tilt is generally at 15 from the horizontal although this is not a limitation nor limiting feature. It is designed to have an angle with the horizontal approximately equal to the angle of the last flange 66 of the guide means 24 of the transport apparatus. Because the sheet emerges in a rigid state, due to the effect on it by the deflector finger 42, it maintains the same angle with the horizontal as the guide plate segment 66. Since this corresponds with the angle of the copy tray 10 to the horizontal, the sheet is presented parallel to the bottom of the copy holder tray and when released by the transport apparatus will fall flat onto the copy tray or the preceding sheet gathered thereon.
  • FIG. 2 manifests a more simplified version of the deflector finger embodied in a transport apparatus super structure 8.
  • the guide means and pinch rollers may be the same as those shown in FIG. 1 including the set of final pinch rollers 36 and 30.
  • the deflector finger 68 is rigidly fastened to the super structure 8 at the top front portion thereof in a position in front of the final set of pinch rollers.
  • the finger is positioned to interfere with the path of travel of the sheet being transported through the super structure and does not ride up as a sheet passes therebeneath, but is precisely positioned to maintain the exact deflection necessary to achieve the desired result of rigidity of the sheet passing thereunder by imparting to the sheet the requisite beam strength.
  • the amount of intereference between the bottom por-- tion of finger 68 and the path of travel of a sheet transported through the super structure is predetermined and pre-set by moving the fastening screw 70, and with it the finger 68, forward and back in relation to the pinch rollers 30 and 36 along an elongated slot 72 in the super structure 8. Once adjusted, the finger will so remain until a further external adjustment is made. If, however, the apparatus is used for a single stock of sheet material it would not be necessary to provide easily accessible adjustment means since a single setting will be all that is necessary to impart the proper deflection in the sheet to cause it to be rigid but not to crease under the force exerted by the deflection finger.
  • a sheet handling apparatus for preventing sheets from buckling while being transported in a partially unsupported condition comprising a transport means of a predetermined width adapted to move a sheet along a predetermined path of travel,
  • a resilient member interposed in the path of travel of the sheet and positioned between the edges of the transport means to urge the sheet out of and below the path of travel at the contact point causing the sheet to be depressed with the portion of the sheet contacting said member moved to a plane below the remainder of the sheet
  • said member being shaped and positioned to prevent the marring of the sheet by forming a crease therein.
  • said member is an elongated finger having a biasing means associated therewith to maintain said member in a position wherein it extends into the path of travel of a sheet.
  • said transport means includes at least one pair of pinch rollers and said member is positioned in the path of travel developed by said pinch rollers such that it contacts a sheet traveling along the path of travel.
  • said means to maintain said member in a position that extends substantially into the path of travel includes means to pivotally mount said member to resiliently extend into the path of travel of a sheet whereby it is urged away from the path though maintained therein as a sheet passes into operable contact therewith.
  • said means to maintain said member in a position that extends substantially into the path of travel includes means to mount said member to extend into the predetermined path of travel, said means to mount adapted to move said member to a position being relatively greater removed from the predetermined path of travel as a sheet passes into operable contact with said member.
  • a sheet handling apparatus for preventing sheets from buckling while being transported in a partially unsupported condition comprising a transport means of predetermined width adapted to move a sheet along a predetermined path of travel,
  • an elongated finger having a biasing means associated therewith to maintain the finger in a position wherein it extends into the path of travel of the sheet and is positioned between the edges of said transport means to urge the sheet out of the path of travel at the contact point, spring in biasing contact with said elongated finger adapted to exert a force thereon in a direction opposite to that exerted by a sheet being moved in contact therewith, said force being capable of overcoming the force exerted on the finger by a sheet, whereby said member depresses the sheet in the area of contact sufliciently to prevent the buckling thereof.
  • said spring is a cantilever bar and has further associated therewith a movable fulcrum for varying its eflective length and, therefore, the force it exerts on said member.
  • said means to maintain said member in a position that extends substantially into the path of travel includes a weighted arm intimately attached to said member, 50 said weighted arm arranged to exert a force on said member in the same direction as the force of gravity exerts on said weighted arm whereby said weighted arm acts as a lever in relation to said member.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US586474A 1966-10-13 1966-10-13 Sheet handling apparatus Expired - Lifetime US3434710A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US58647466A 1966-10-13 1966-10-13
US58648766A 1966-10-13 1966-10-13
US58647766A 1966-10-13 1966-10-13
US586490A US3405564A (en) 1966-10-13 1966-10-13 Pulley

Publications (1)

Publication Number Publication Date
US3434710A true US3434710A (en) 1969-03-25

Family

ID=27504978

Family Applications (3)

Application Number Title Priority Date Filing Date
US586474A Expired - Lifetime US3434710A (en) 1966-10-13 1966-10-13 Sheet handling apparatus
US586487A Expired - Lifetime US3510219A (en) 1966-10-13 1966-10-13 Optical alignment system
US586477A Expired - Lifetime US3480360A (en) 1966-10-13 1966-10-13 Xerographic copying apparatus

Family Applications After (2)

Application Number Title Priority Date Filing Date
US586487A Expired - Lifetime US3510219A (en) 1966-10-13 1966-10-13 Optical alignment system
US586477A Expired - Lifetime US3480360A (en) 1966-10-13 1966-10-13 Xerographic copying apparatus

Country Status (13)

Country Link
US (3) US3434710A (de)
AT (3) AT301344B (de)
BE (1) BE704978A (de)
BR (2) BR6793790D0 (de)
CH (3) CH487439A (de)
DE (1) DE1597384A1 (de)
DK (1) DK120163B (de)
ES (3) ES345998A1 (de)
GB (3) GB1206965A (de)
GR (1) GR35147B (de)
LU (1) LU54635A1 (de)
NL (1) NL6713924A (de)
SE (3) SE337743B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006633A1 (en) * 1988-01-15 1989-07-27 Emf Corporation Paper sheet stacking and jogging apparatus
US5221950A (en) * 1992-05-26 1993-06-22 Xerox Corporation Device for correcting for corrugation induced in a sheet as a result of passing through transport nips
US5618036A (en) * 1995-11-16 1997-04-08 Lexmark International, Inc. Printer with distribution stations having U-shaped sheet guide
US5700005A (en) * 1996-04-23 1997-12-23 Must Systems Inc. Apparatus for controlling sheet feed-out from an automatic sheet feeder into a receiving tray
DE102004031172A1 (de) * 2004-06-28 2006-01-12 Eastman Kodak Co. Vorrichtung zur Handhabung eines Bedruckstoffes

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620620A (en) * 1968-01-31 1971-11-16 Canon Camera Co Original holder reciprocating-type driving device for photocopying machine
JPS4923766B1 (de) * 1970-08-13 1974-06-18
US3753615A (en) * 1972-04-26 1973-08-21 Dyk Res Corp Van Scanning apparatus
DE2258669C2 (de) * 1972-11-30 1982-05-13 Agfa-Gevaert Ag, 5090 Leverkusen Buchkopiergerät
US3878005A (en) * 1973-06-18 1975-04-15 Rockwell International Corp Method of chemically polishing metallic oxides
US3909128A (en) * 1973-08-31 1975-09-30 Xerox Corp Control logic for changing a multi-mode copier/duplicator from one mode to another
US4214740A (en) * 1978-05-02 1980-07-29 Xerox Corporation Sheet reversing mechanism
US4226392A (en) * 1978-06-05 1980-10-07 General Dynamics Corporation Pomona Division Three dimensional fine focus detector mount
US4268123A (en) * 1979-02-26 1981-05-19 Hughes Aircraft Company Kinematic mount
US4268165A (en) * 1979-12-17 1981-05-19 International Business Machines Corporation Apparatus and method for controlling the adjustment of optical elements in an electrophotographic apparatus
US4272187A (en) * 1979-12-17 1981-06-09 International Business Machines Corporation Automatic alignment of optical elements in an electrophotographic apparatus
US4648706A (en) * 1984-10-17 1987-03-10 Casio Computer Company, Ltd. Image reproduction apparatus
US4687318A (en) * 1984-12-25 1987-08-18 Casio Computer Co, Ltd. Copying apparatus
US4733271A (en) * 1985-04-30 1988-03-22 Casio Computer Co., Ltd. Image reproduction apparatus with detector for detecting position of moveable copier unit
JPH0827485B2 (ja) * 1988-02-22 1996-03-21 富士写真フイルム株式会社 光学手段駆動構造
US4987441A (en) * 1988-06-06 1991-01-22 Polaroid Corporation Compact hand-held apparatus for copying an illuminated image
US5648807A (en) * 1992-09-10 1997-07-15 Seiko Epson Corporation Ink jet recording apparatus having an antismear sheet deformation discharge system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095192A (en) * 1961-03-06 1963-06-25 Universal Match Corp Feeding mechanism for documents or the like
US3224705A (en) * 1963-09-23 1965-12-21 Ralph C Nash Dispenser for plastic strapping
US3291485A (en) * 1965-04-26 1966-12-13 Ibm Record card stacking apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285768A (en) * 1940-10-11 1942-06-09 Burke & James Inc Lens mounting
US2368970A (en) * 1941-11-17 1945-02-06 Norman L Cook Camera construction
US2487561A (en) * 1942-10-06 1949-11-08 Photostat Corp Photographic copying machine
US2603125A (en) * 1949-08-16 1952-07-15 Ada Fuegeman Combination enlarger and projector system
US3167997A (en) * 1961-07-07 1965-02-02 Quik Photo Electronics Inc Combined enlarging and photographic machine
US3379106A (en) * 1964-12-31 1968-04-23 Xerox Corp Xerographic reproduction apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095192A (en) * 1961-03-06 1963-06-25 Universal Match Corp Feeding mechanism for documents or the like
US3224705A (en) * 1963-09-23 1965-12-21 Ralph C Nash Dispenser for plastic strapping
US3291485A (en) * 1965-04-26 1966-12-13 Ibm Record card stacking apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006633A1 (en) * 1988-01-15 1989-07-27 Emf Corporation Paper sheet stacking and jogging apparatus
US4890825A (en) * 1988-01-15 1990-01-02 Emf Corporation Paper sheet stacking and jogging apparatus
US5221950A (en) * 1992-05-26 1993-06-22 Xerox Corporation Device for correcting for corrugation induced in a sheet as a result of passing through transport nips
US5618036A (en) * 1995-11-16 1997-04-08 Lexmark International, Inc. Printer with distribution stations having U-shaped sheet guide
US5700005A (en) * 1996-04-23 1997-12-23 Must Systems Inc. Apparatus for controlling sheet feed-out from an automatic sheet feeder into a receiving tray
DE102004031172A1 (de) * 2004-06-28 2006-01-12 Eastman Kodak Co. Vorrichtung zur Handhabung eines Bedruckstoffes

Also Published As

Publication number Publication date
AT310556B (de) 1973-10-10
DK120163B (da) 1971-04-19
CH502942A (de) 1971-02-15
BR6793791D0 (pt) 1973-04-26
US3510219A (en) 1970-05-05
DE1597384A1 (de) 1969-10-02
AT301344B (de) 1972-08-25
ES360896A1 (es) 1970-07-16
LU54635A1 (de) 1968-04-27
ES345998A1 (es) 1969-03-16
BE704978A (de) 1968-04-11
BR6793790D0 (pt) 1973-04-26
GR35147B (el) 1968-08-21
GB1206965A (en) 1970-09-30
NL6713924A (de) 1968-04-16
AT289543B (de) 1971-04-26
CH501233A (de) 1970-12-31
US3480360A (en) 1969-11-25
ES360895A1 (es) 1970-07-16
SE356607B (de) 1973-05-28
SE337743B (de) 1973-03-05
CH487439A (de) 1970-03-15
GB1206964A (en) 1970-09-30
GB1206966A (en) 1970-09-30
SE359168B (de) 1973-08-20

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