US3842800A - Transfer roller assembly - Google Patents

Transfer roller assembly Download PDF

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Publication number
US3842800A
US3842800A US00214289A US21428971A US3842800A US 3842800 A US3842800 A US 3842800A US 00214289 A US00214289 A US 00214289A US 21428971 A US21428971 A US 21428971A US 3842800 A US3842800 A US 3842800A
Authority
US
United States
Prior art keywords
transfer roller
shaft
assembly
handle
locking
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
US00214289A
Other languages
English (en)
Inventor
D Hoffman
T Meagher
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
Priority to BE793553D priority Critical patent/BE793553A/xx
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to US00214289A priority patent/US3842800A/en
Priority to CA149,643A priority patent/CA978022A/en
Priority to DE2243732A priority patent/DE2243732A1/de
Priority to NL7214009A priority patent/NL7214009A/xx
Priority to FR7237770A priority patent/FR2166926A5/fr
Priority to BR8206/72A priority patent/BR7208206D0/pt
Priority to GB5856972A priority patent/GB1412454A/en
Priority to SE7216978A priority patent/SE379103B/xx
Priority to JP48004289A priority patent/JPS4875040A/ja
Priority to ES410173A priority patent/ES410173A1/es
Priority to IT34018/72A priority patent/IT973320B/it
Application granted granted Critical
Publication of US3842800A publication Critical patent/US3842800A/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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer

Definitions

  • a transfer roller assembly including a transfer roller for an electrostatographic machine.
  • the transfer roller assembly is rotated about a support shaft in response to spring tension to place the transfer roller in pressure contact with the photoconductive surface during the image transfer mode therefore, The transfer roller assembly is rotated in the opposite direction by removal of such spring tension for diverse reasons, for example to facilitate replacement of the photoconduct member.
  • This invention relates to electrostatography, and more particularly to a novel transfer roller assembly for an electrostatographic apparatus.
  • a xerographic surface comprising a layer of photoconductive insulating material affixed to a conductive backing is used to support electrostatic images.
  • the xerographic plate is electrostatically charged uniformly over its surface and then exposed to a light pattern of the image being reproduced to thereby discharge the charge in the areas where light strikes the layer.
  • the undischarged areas of the layer thus form an electrostatic charge pattern in conformity with the configuration of the original light pattern.
  • a finely divided electrostatically attractable materiaL such as a resinous powder.
  • the powder is held in the image areas by the electrostatic fields on the layer. Where the field is greatest, the greatest amount of material is deposited; and where the field is least, little or no material is deposited.
  • a powder image is produced in conformity with the light image of the copy being reproduced.
  • the powder is subsequently transferred to a sheet of paper or other surface and suitably affixed to thereby form a perinanent print.
  • the toner may be fixed by passing the sheet of paper or other surface including the transferred image between a heated roller and a second roller in pressure contact therewith whereby the toner becomes fused to the sheet of paper.
  • the image is generally transferred to an image receiving member by passing such a member between the photoconductive surface including the developed image and a roller in contact therewith/In, order to transfer effectively any such image there is need for uniform contact along the nip of the photoconductive surface and the transfer roller.
  • a transfer roller assembly rotatably supported within the housing of an electrostatographic machine in juxtaposition to a photoconductive surface therefor.
  • the transfer roller assembly is provided with bracket means which engage spring loaded lever ele-' ments rotatably mounted on a locking shaft mounted
  • the latent electrostatic image may then be developed 2 for rotation in the housing of the machine.
  • the locking shaft is provided with a handle for moving the shaft to an image transfer mode with the concomittant nominal rotation of the transfer roller assembly thereby bring the transfer roller into uniform contact with the photoconductive surface.
  • FIG. 1 is a schematic sectional view of an electrostatic reproduction machine embodying the principles of the invention.
  • FIG. 2 is an end view of the transfer roller assembly.
  • FIG. 3 is an isometric view (greatly simplified) of the transfer roller assembly.
  • FIG. 4 is a partialrear view in section of the transfer roller assembly taken along the lines 4-4 of FIG. 2;
  • FIGS is a rear view of the locking shaft assembly
  • FIG. 6 is a side elevation view of amounting frame for the transfer roller assembly.
  • FIG. 7 is a side view of the transfer roller assembly illustrating the movement thereof when disposed in juxtaposition to a photoconductive 'belt of an electrostatographic machine.
  • FIG. 1 For a general understanding of the illustrated copier/reproduction machine in which the invention may be incorporated, reference is had to FIG. 1 in which the various system components for the machine are schematically illustrated.
  • a document D to be copied is placed upon a transparent support platen P fixedly arranged in an illumination assembly, generally indicated by the reference numeral 10, positioned at the left end of the machine.
  • Light rays from an illumination system are flashed upon the document to produce image rays corresponding to the'informational areas.
  • the image rays are projected by means of an optical system onto the photosensitive surface of a xerographic plate in the form of a flexible photoconductive belt 12 arranged on abelt assembly, generally indicated by the reference numeral 14.
  • the belt 12 comprises a photoconductive layer of selenium which is the light receiving surface and imaging medium for the apparatus, on a conductive backing.
  • the surface of the photoconductive belt is made photosensitive by a previous step of uniformly charging the same by-means of a corona generating device or corotron 13.
  • the belt is journaled for continuous movement upon three rollers 20, 21 and 22 positioned with their axes in parallel.
  • the photoconductive belt'assembly 14 is slidably mounted upon two support shafts 23 and 24 with the roller 22 rotatably supported on the shaft 23 i which is secured to the frame of the apparatus and is rotatably driven by a suitable motor and drive assembly (not shown) in the direction of the arrow at a constant rate.
  • a suitable motor and drive assembly (not shown) in the direction of the arrow at a constant rate.
  • the portion exposed is that portion of the belt running between rollers 20 and 21.
  • the reflected light image of such original document positioned on the platen is flashed on the surface of the belt to produce an electrostatic latent image thereon at exposure station A.
  • the electrostatic image passes through a developing station B in which there is positioned a developer assembly generally indicated by the reference numeral 15, and which provides development of the electrostatic image by means of multiple brushes 16 as the same moves through the development zone.
  • the developed electrostatic image is transported by the belt to a transfer station C wherein the present invention may be positioned and whereat a sheet of copy paper is moved between a transfer roller and the belt at a speed in synchronism with the moving belt in order to accomplish transfer of the developed image solely by' an electrical bias on the transfer roller.
  • a sheet transport mechanism generally indicated at 17 adapted to transport sheets of paper from a paper handling mechanism generally indicated by the reference numeral 18 to the developed image on the belt at the station C.
  • the sheet After the sheet is stripped from the belt 12, it is conveyed into a fuser assembly, generally indicated by the reference numeral 19, wherein the developed and transferred xerographic powder image on the sheet material is permanently affixed thereto. After fusing, the finished copy is discharged from the apparatus at a suitable point for collection externally of the apparatus.
  • a transfer roller assembly generally indicated as 30, comprised of a transfer roller 32 mounted for rotation about a shaft 34 in hub assemblies 36.
  • a gear 38 is affixed to an end of the shaft 34 extending through the hub assembly 36 and engages an endless belt 40 to rotate the transfer roller 32 through a suitable drive assembly, generally indicated as 42.
  • a support shaft 44 is mounted for rotation in hub assemblies 36 above the transfer roller 32 in coaxial alignment therewith and extends outwardly beyond the hub assemblies 36.
  • a gear 46 is affixed to the shaft 44 and similarly engages the endless belt 40.
  • Bearings 48 are positioned on the ends of the shaft 44 and are positioned in frame support assemblies, generally indicated as 50 and 52 (see FIGS. and 6).
  • the frame support assemblies 50 and 52 are comprised of a frame section 54 having a cylindrically shaped machined surfaces 56 for receiving the bearings 48 of the support shaft 44.
  • An upwardly extending tab section 58 is formed on the frame section to receive a clamp 60 pivotally mounted to the tab section 58, such as by a pin 62.
  • the clamp 60 is held in locking relationship to the frame section 54 by a screw 64.
  • the frame section 54 is provided with a shaft receiving orifice 66 and mounting holes 68 for affixing the frame assembly handle 74 is affixed to the shaft 72 at an intermediate position thereof for rotation of the shaft to a locking attitude, as more fully hereinafter discussed.
  • spring retaining assemblies 76 Positioned on either side of the shaft 72, there are affixed spring retaining assemblies 76 in which is positioned one end I of springs 78. The other end of the springs 78 are af- 52 to the main body (not shown) of the electrostatofixed to lever elements 80 mounted for rotation about the shaft 72 and having an outwardly extending pin sections 82. Each pin section 82 engages grooved sections I 84 formed on an outer surface of the hub assemblies 36 (See FIG. 2).
  • the handle 74 is positioned within a receiving plate 86 having a U-shaped opening '90 mounted to a hub assembly,generally indicated as 98, such as by screws 94.
  • the handle 74 is moved clockwise from the position A, illustrated by the solid lines to position B, illustrated by the dotted lines and locked against counterclockwise rotation in the opening 90 of the receiving plate 86 thereby rotating assembly, generally the shaft 72.
  • Such rotation of the shaft 72 causes the lever elements to rotate clockwise about the shaft 72 forcing the pin section 82 thereof to press against one side of the cooperating grooves 84 on the hub assemblies thereby forcing under spring tension the transfer roller assembly 30 against the photoconductive surface 96.
  • This relationship of pressure contact of the transfer roller 32 with the photoconductive member 96 facilitates image transfer and permits the transfer roller 32 and photoconductive member 96 to function as part of the transport system for image receiving members.
  • An improved electrostatographic machine having a photoconductive member, the improvement comprismg:
  • a transfer roller assembly mounted for rotation within said machine, said assembly including end members each having groove means formed therein, a transfer roller rotatably mounted to said end members, a mounting shaft parallel to said transfer roller and rotatably mounted to said end members, bearing means for mounting said mounting shaft within said machine, said assembly being adapted to rotate about the axis of said mounting shaft, said transfer roller being disposed adjacent said photoconductive member,
  • said placing means including a locking shaft rotatably mounted parallel to said transfer roller, a handle connected to said locking shaft for rotating the same, an arm mounted on each side of said handle, each of said arms being mounted to rotate with respect to said locking shaft and having means for enhaving a generally U-shaped opening, and wherein said handle is positioned within said opening, and wherein one leg of said opening is adapted to engage said handle in locking attitude for maintaining the pressure contact between said photoconductive member and said transfer roller.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Rolls And Other Rotary Bodies (AREA)
US00214289A 1971-12-30 1971-12-30 Transfer roller assembly Expired - Lifetime US3842800A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
BE793553D BE793553A (fr) 1971-12-30 Dispositif a rouleau de transfert pour machine electrostatographique
US00214289A US3842800A (en) 1971-12-30 1971-12-30 Transfer roller assembly
CA149,643A CA978022A (en) 1971-12-30 1972-08-17 Transfer roller assembly
DE2243732A DE2243732A1 (de) 1971-12-30 1972-09-06 Uebertragungswalzenanordnung
NL7214009A NL7214009A (xx) 1971-12-30 1972-10-17
FR7237770A FR2166926A5 (xx) 1971-12-30 1972-10-25
BR8206/72A BR7208206D0 (pt) 1971-12-30 1972-11-22 Maquina eletrostatografica aperfeicoada tendo um membro foocundutor
GB5856972A GB1412454A (en) 1971-12-30 1972-12-19 Apparatus for transferring a transferable image from an electro statographic member for bearing said image to an image re ceiving member
SE7216978A SE379103B (xx) 1971-12-30 1972-12-27
JP48004289A JPS4875040A (xx) 1971-12-30 1972-12-29
ES410173A ES410173A1 (es) 1971-12-30 1972-12-29 Mejoras introducidas en una maquina electrostatografica.
IT34018/72A IT973320B (it) 1971-12-30 1972-12-29 Apparecchio a rullo di trasferi mento per macchine elettrostato grafiche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00214289A US3842800A (en) 1971-12-30 1971-12-30 Transfer roller assembly

Publications (1)

Publication Number Publication Date
US3842800A true US3842800A (en) 1974-10-22

Family

ID=22798517

Family Applications (1)

Application Number Title Priority Date Filing Date
US00214289A Expired - Lifetime US3842800A (en) 1971-12-30 1971-12-30 Transfer roller assembly

Country Status (12)

Country Link
US (1) US3842800A (xx)
JP (1) JPS4875040A (xx)
BE (1) BE793553A (xx)
BR (1) BR7208206D0 (xx)
CA (1) CA978022A (xx)
DE (1) DE2243732A1 (xx)
ES (1) ES410173A1 (xx)
FR (1) FR2166926A5 (xx)
GB (1) GB1412454A (xx)
IT (1) IT973320B (xx)
NL (1) NL7214009A (xx)
SE (1) SE379103B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087169A (en) * 1975-11-14 1978-05-02 Xerox Corporation Transfer roller system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56116064A (en) * 1980-02-18 1981-09-11 Minolta Camera Co Ltd Pressure transferring method for pulverulent toner image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087169A (en) * 1975-11-14 1978-05-02 Xerox Corporation Transfer roller system

Also Published As

Publication number Publication date
FR2166926A5 (xx) 1973-08-17
SE379103B (xx) 1975-09-22
DE2243732A1 (de) 1973-07-05
BR7208206D0 (pt) 1973-09-13
BE793553A (fr) 1973-06-29
IT973320B (it) 1974-06-10
JPS4875040A (xx) 1973-10-09
GB1412454A (en) 1975-11-05
CA978022A (en) 1975-11-18
NL7214009A (xx) 1973-07-03
ES410173A1 (es) 1976-01-01

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