US3918702A - Copier and sheet stripping finger therefor - Google Patents

Copier and sheet stripping finger therefor Download PDF

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Publication number
US3918702A
US3918702A US444372A US44437274A US3918702A US 3918702 A US3918702 A US 3918702A US 444372 A US444372 A US 444372A US 44437274 A US44437274 A US 44437274A US 3918702 A US3918702 A US 3918702A
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US
United States
Prior art keywords
drum
stripping
axis
wheel
copier
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
US444372A
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English (en)
Inventor
Nandor Mihalik
Nicholas Gilbert Shreeve
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.)
Gestetner Byfleet Ltd
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Gestetner Byfleet 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 Gestetner Byfleet Ltd filed Critical Gestetner Byfleet Ltd
Application granted granted Critical
Publication of US3918702A publication Critical patent/US3918702A/en
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    • 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
    • G03G15/6532—Removing a copy sheet form a xerographic drum, band or plate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S271/00—Sheet feeding or delivering
    • Y10S271/90—Stripper

Definitions

  • ABSTRACT A copier having a rotatable drum includes one or more stripping fingers to detach the leading edge of a copy sheet from thedrum and one or more wheels arranged to be struck by the leading edge and to prevent subsequent contact between the stripping fingers and the copy sheet as the copy sheet is advanced from the drum along a forwarding path.
  • FIG. 1 is a diagrammatic representation of FIG.
  • the present invention relates to a device for separating a copy sheet from a drum, for example the charged drum of an electrostatographic copying machine.
  • the image on a drum is is transferred to copy sheets which tend to cling to the drum by electrostatic attraction and various means have been proposed for effecting the efficient peeling or stripping of copy sheets from such drums.
  • the chief problem to be overcome is to effect this stripping or peeling without scratching the surface of the drum and the undeveloped toner deposited on the surface of the sheet.
  • a copier having a drum on which, in use of the copier, copy sheets are carried and from which they are advanced along a forwarding path; and a stripper assembly for removing copy sheets from said drum, the assembly including at least one stripping finger and at least one freely rotatable wheel, the or each stripping finger having a stripping tip urged into contact with the peripheral surface of the drum to detach the leading edge of a copy sheet from the periphery of the drum, the or each wheel having a narrow peripheral rim and being located in the forwarding path and immediately downstream of theor each stripping tip and having an axis of rotation substantially perpendicular to the direction of feed of the copy sheet and substantially parallel to the axis of rotation of the drum, the or each wheel and the or each stripping finger being positioned relative to the drum, such that the drum and the or each wheel share a common tangential plane towards which any point of the drum surface moves during its approach to a stripping finger and toone side of which the drum and the
  • each wheel is mounted on an associated stripping finger, for example on a shaft extending from a lateral surface of the associated stripping finger.
  • the configuration of the periphery of the wheels may conform to any one of a large variety of patterns, but is advantageously such that the instantaneous contact area between a wheel and the surface of'the copy sheet is always small enough to ensure that no substsantial marks are left on the surface of the sheet to mark the image after printing.
  • a wheel may suitably have a discontinuous periphery of undulating form, for example, it may be knurled or fluted in an axial direc- 'tion.
  • a stripping finger assembly for peeling sheets from a drum in a copying machine, such finger having a tip at one end and carrying a freely rotatable wheel provided with a narrow rim which projects beyond the edge of the finger which, in use of the finger is intended to be the lower edge at a position near to, but spaced rearwardly from the tip.
  • FIG. 1 is a fragmentary elevation of a preferred embodiment of stripping finger and wheel according to the invention
  • FIG. 2 is a plan view of the stripping finger and wheel of FIG. 1, and
  • FIG. 3 is a section on the line 3-3 of FIG. 2.
  • an image bearing drum rotates about its axis 28 in the direction of the arrow A. and on its peripheral surface 2 a copy sheet (not shown) rides towards a stripping tip 6 having a blunt forward end of a stripping finger 4 which carries a wheel 10.
  • Stripping finger 4 is pivotally mounted on a shaft 16 which passes through the finger at the end opposite the stripping tip 6 and the pivotal stripping finger assembly is biased in the anticlockwise sense by means of a counter weight 20.
  • a counter weight 20 means of a counter weight 20.
  • FIG. 1 it can be seen that the pivot axis 16 of the stripping finger 4 is substantially parallel to the axis 28 of the drum.
  • the biasing force on the stripping tip 6 is preferably of the order of 1 gram.
  • the wheel 10 is freely rotatably supported by a boss 8 extending transversely of the longitudinal axis of the stripping finger 4 substantially parallel to the axis of the drum and is shown as having a serrated peripheral edge comprising teeth 14, The wheel tapers towards that edge when viewed in the plan view of FIG. 2.
  • the edge may equally be knurled in the axial direction and/or fluted inthe peripheral direction.
  • FIG. 1 also shows certain geomctrical restraints on the relative positioning of the drum. stripping finger 4 and wheel to ensure correct operation of the invention.
  • the dashed line 2224 represents a plane which is tangential to both the wheel 10 and the drum such that during clockwise rotation of the drum any point of the peripheral surface 2 of the drum moves from this tangential plane as it approaches the stripping tip 6 and such that both the drum and wheel 10 are located to one side of the tangential plane 22-24.
  • the stripping tip 6 must be located to the same side of and spaced from that tangential plane as are the wheel 10 and the drum, as shown.
  • the top surface of stripping tip' 6 is fluted.
  • the lateral and lower surfaces of the finger 4 are shaped to define a longitudinally extending rib which tapers downwardly towards the concave under surface 12 and extends right up to the end of stripping tip 6 to ensure that the contact area between the strip-' ping finger 4 and the peripheral surface 2 of the drum or the image bearing surface of a copy sheet is always minimised, and to ensure that equally the stripping tip 6 does not scratch the delicate photoeonductor surface of the drum 1 or disturb the electrostatic image on the sheet.
  • the stripping fingers themselves may be made of any suitable material.
  • a copier including a drum rotatable in one direction about an axis and having a peripheral surface and means for carrying a copy sheet on said peripheral surface; means defining a forwarding path for copy sheets from said drum; stripping finger means positioned adjacent'said drum; stripping tip means of said stripping finger means positioned in contact with said drum; means biasing said stripping tip means against said peripheral surface of the drum; wheel means; shaft means carried by said stripping finger means and mounting said wheel means for rotation about an axis parallel to the axis of rotation of said drum and located immediately downstream of said stripping tip means in the direction of the sheet movement along said forwarding path; said drum and said wheel means sharing a common tangential plane from which any point on the drum surface moves during its approach to said stripping tip means, and to one side of which the drum and wheel means both lie,
  • stripping finger means being shaped and positioned to lie entirely to said one side of said common; tangential plane. the stripping tip means being spaced 1 from saidtangential plane.
  • stripping finger means and said wheel means consistof two stripping fingers and two wheels respectively, the stripping fingers being spaced in a direction parallel to said drum axis. and each wheel being located adjacent are spective one of said stripping fingers.
  • stripping tip means includes planar surface means extending in a plane parallel to said drum axis, and an edge to said '1 planar surface means said edge being blunt when viewed along a direction perpendicular to said plane.
  • a copier including a drum rotatable in one direction about an axis and having a peripheral surface and means for carrying a copy sheet on said peripheral surface; means defining a forwarding path for copy sheets on said drum; stripping finger means positioned adjacent said drum; stripping tip means of said strippingfinger means positioned in contact with said drum; means biasing said stripping tip means against said peripheral surface of the drum; wheel means; radially outer edges for said wheel means, the wheel means having an axial cross-section which tapers towards said outer edges; and means mounting said wheel means for rotation about an axis parallel to the axis of rotation of said drum and located immediately downstream of said I stripping tip means in the direction of copy sheet movement along said forwarding path; said drum and said wheel means sharing a common tangential plane. from which any point from the drum surface moves during its approach to said stripping tip means, and to one side of which the drum and wheel means both lie, said stripping finger means being shaped and positioned to lie entirely to one side of said common tangential plane,
  • a copier including a drum rotatable in one direction about a horizontal axis and having a peripheral surface and means for carrying a copy sheet on said pe-:
  • stripping finger means positioned adjacent said drum below a horizontal plane including said axis; stripping tip means of said stripping finger means positioned in contact with said drum;
  • wheel means for rotation about an axis parallel to said axis of rotation of said drum and located immediately downstream of said stripping tip means in the direction of copy sheet movement along said forwarding path; said drum and said wheel means sharing a common tangential plane from which any point from the drum surface moves during its approach to said stripping tip means, said drum and wheel means both lying to one side of said tangential plane; said stripping finger means being shaped and positioned to lie entirely to one side of said common tangential plane, and the stripping tip means being spaced from said tangential plane.
  • stripping finger means have means defining a concavely undercut lower surface.
  • stripping tip means includes upwardly facing planar surface means extending in a plane parallel to said drum axis; and an edge to said planar surface means. said edge being blunt when viewed in a direction perpendicular to said plane and said downwardly projecting rib being shaped to taper towards and to terminate at said edge.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US444372A 1973-02-23 1974-02-21 Copier and sheet stripping finger therefor Expired - Lifetime US3918702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB905073A GB1417443A (en) 1973-02-23 1973-02-23 Copier and sheet stripping finger therefor

Publications (1)

Publication Number Publication Date
US3918702A true US3918702A (en) 1975-11-11

Family

ID=9864441

Family Applications (1)

Application Number Title Priority Date Filing Date
US444372A Expired - Lifetime US3918702A (en) 1973-02-23 1974-02-21 Copier and sheet stripping finger therefor

Country Status (8)

Country Link
US (1) US3918702A (enrdf_load_stackoverflow)
JP (1) JPS49119631A (enrdf_load_stackoverflow)
CA (1) CA992573A (enrdf_load_stackoverflow)
DE (1) DE2408443B2 (enrdf_load_stackoverflow)
FR (1) FR2219014B1 (enrdf_load_stackoverflow)
GB (1) GB1417443A (enrdf_load_stackoverflow)
IT (1) IT1015820B (enrdf_load_stackoverflow)
NL (1) NL7402439A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4261560A (en) * 1977-12-21 1981-04-14 Ricoh Company, Ltd. Sheet separation apparatus
US4685815A (en) * 1986-03-21 1987-08-11 Eaton Corporation Printing apparatus
FR2606174A1 (fr) * 1986-10-31 1988-05-06 Toshiba Kk Appareil de formation d'image
US4761667A (en) * 1985-07-01 1988-08-02 Sanyo Electric Co., Ltd. Image forming apparatus
US5671471A (en) * 1993-12-28 1997-09-23 Minolta Co., Ltd. Sheet separating device
US20040084838A1 (en) * 2002-10-29 2004-05-06 Susumu Murakami Paper separator and processor cartridge
US6785503B2 (en) * 2002-10-02 2004-08-31 Xerox Corporation Stripper fingers and roller assembly for a fuser in a printing apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5252951U (enrdf_load_stackoverflow) * 1975-10-14 1977-04-15
DE2642707C2 (de) * 1976-09-23 1978-10-12 Lumoprint Zindler Kg, 2000 Hamburg Vorrichtung zum Abstreifen eines vorlaufenden Randes eines Empfangsblattes von einem Übertragungsbildträger
JPS61160462U (enrdf_load_stackoverflow) * 1985-03-27 1986-10-04
GB2279039B (en) * 1993-06-01 1997-03-12 Oki Electric Ind Co Ltd Fusing apparatus and method for fusing toner to a recording medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1011046A (en) * 1911-04-27 1911-12-05 Autopress Company Delivery mechanism for printing-presses.
US1078238A (en) * 1911-03-16 1913-11-11 Cottrell C B & Sons Co Sheet-delivery mechanism for printing-machines.
US1737616A (en) * 1928-02-23 1929-12-03 Walter A Saatman Picker holder
US2844372A (en) * 1955-09-28 1958-07-22 Liebenow Julius Gus Stripper mechanism
US3642274A (en) * 1970-08-07 1972-02-15 Francis Walter Herrington Sheet-supporting assembly for an inverter roll

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1078238A (en) * 1911-03-16 1913-11-11 Cottrell C B & Sons Co Sheet-delivery mechanism for printing-machines.
US1011046A (en) * 1911-04-27 1911-12-05 Autopress Company Delivery mechanism for printing-presses.
US1737616A (en) * 1928-02-23 1929-12-03 Walter A Saatman Picker holder
US2844372A (en) * 1955-09-28 1958-07-22 Liebenow Julius Gus Stripper mechanism
US3642274A (en) * 1970-08-07 1972-02-15 Francis Walter Herrington Sheet-supporting assembly for an inverter roll

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4261560A (en) * 1977-12-21 1981-04-14 Ricoh Company, Ltd. Sheet separation apparatus
US4761667A (en) * 1985-07-01 1988-08-02 Sanyo Electric Co., Ltd. Image forming apparatus
US4685815A (en) * 1986-03-21 1987-08-11 Eaton Corporation Printing apparatus
FR2606174A1 (fr) * 1986-10-31 1988-05-06 Toshiba Kk Appareil de formation d'image
US4893146A (en) * 1986-10-31 1990-01-09 Kabushiki Kaisha Toshiba Paper separating claw for image forming apparatus
US5671471A (en) * 1993-12-28 1997-09-23 Minolta Co., Ltd. Sheet separating device
US6785503B2 (en) * 2002-10-02 2004-08-31 Xerox Corporation Stripper fingers and roller assembly for a fuser in a printing apparatus
US20040084838A1 (en) * 2002-10-29 2004-05-06 Susumu Murakami Paper separator and processor cartridge
US7251450B2 (en) * 2002-10-29 2007-07-31 Sharp Kabushiki Kaisha Paper separator and processor cartridge

Also Published As

Publication number Publication date
IT1015820B (it) 1977-05-20
GB1417443A (en) 1975-12-10
CA992573A (en) 1976-07-06
DE2408443A1 (de) 1974-09-05
FR2219014B1 (enrdf_load_stackoverflow) 1976-06-25
DE2408443B2 (de) 1977-05-12
JPS49119631A (enrdf_load_stackoverflow) 1974-11-15
FR2219014A1 (enrdf_load_stackoverflow) 1974-09-20
NL7402439A (enrdf_load_stackoverflow) 1974-08-27

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