US3881859A - Stripper finger design to prevent {37 oil-on-the-copy{38 - Google Patents

Stripper finger design to prevent {37 oil-on-the-copy{38 Download PDF

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Publication number
US3881859A
US3881859A US418538A US41853873A US3881859A US 3881859 A US3881859 A US 3881859A US 418538 A US418538 A US 418538A US 41853873 A US41853873 A US 41853873A US 3881859 A US3881859 A US 3881859A
Authority
US
United States
Prior art keywords
roll
heated roll
oil
stripper
toner particles
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
US418538A
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English (en)
Inventor
Willard C Hamilton
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 to US418538A priority Critical patent/US3881859A/en
Priority to CA208,967A priority patent/CA1026421A/en
Priority to NL7412271A priority patent/NL7412271A/xx
Priority to DE19742444876 priority patent/DE2444876A1/de
Priority to FR7437508A priority patent/FR2252592B1/fr
Priority to JP49132640A priority patent/JPS5087040A/ja
Application granted granted Critical
Publication of US3881859A publication Critical patent/US3881859A/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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
    • 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

  • the stripping means is characterized by the provision of a plurality of bifurcated finger-like elements wherein an oil absorbent material is disposed between the portions forming the bifurcation for the purpose of removing umco n 87 703 1 62B4 m n 6 1 n 2 5 4 I.. Q W91 .1 u ...3 m b m W247 ll" .77 2 u DA 3 1 4 HWR n "m, ,3
  • This invention relates, in general, to apparatus for stripping copy paper from aheated fuser roll in a xerographic reproducing apparatus and, more particularly, to stripping apparatus suitable for stripping copies from a fuser roll to which a liquid release agent has been applied for preventing toner offset.
  • a light image of an original to be copied is typically recorded in the form of a latent electrostatic image upon a photosensitive member with subsequent rendering of the latent image visible by the application of electroscopic marking particles, commonly referred to as toner.
  • the visual image can be either fixed directly upon the photosenstive member or transferred from the member to a sheet of plain paper with subsequent affixing of the image thereto.
  • One approach to thermal fusing of electroscopic toner images onto a support has been to pass the support with the toner images thereon between a pair of opposed roller members at least one of which is either externally or internally heated.
  • the support member to which the toner images are electrostatically adhered is moved through the nip formed between the rolls with the toner image contacting the fuser roll to thereby produce heating of the toner images within the nip.
  • extraneous toner particles will be offset to the fuser roll by an insufficient application of heat to the surface thereof; by imperfections in the properties of the entire surface of the roll, or by the toner particles insufficiently adhering to the copy sheet by the electrostatic forces which normally hold them there.
  • extraneous toner particles may be transferred to the surface of the fuser roll beyond the nip, with subsequent transfer to the back-up roll during periods of time when no copy paper is in the nip and 'before the back-up roll can be moved out of contact with the the fuser roll.
  • the low surface energy oils generally act as a non-wetting fluid in regard to most support materials, it [has been found that a mechanical flowing of the release agent from the roll onto the support material will occur if an excess of oil is allowed to accumulate in a region where it can come into contact with the copy paper. Accordingly, the amount of oil applied to the roll surface is generally metered under controlled conditions to maintain a relatively thin coating of the release agent on the roll surface.
  • Another object of the present invention is to provide improved means for removing a copy sheet from the surface of a heating fusing roll.
  • Yet another object of the present invention is to provide a stripping device in conjunction with a heated fusing roll which minimizes the effect of oil accumulated at the contact surface between the stripping means and the fuser roll.
  • the above-cited objects of the present invention are accomplished by means of a sheet removal device which is adapted to move between the surface of an oil coated fuser roll and an image bearing support member carried thereon.
  • the sheet removal device is characterized by the provision of one or more bifurcated stripper elements having an oil absorbent material disposed in the bifurcation of the stripper element in order to absorb the oil tending to accumulate at the leading edge of the stripper member away from the leading edge and into a reservoir for containing the oil so removed from the leading edge of the stripper member.
  • FIG. 1 is a perspective view in partial section illustrating a heated pressure roll image fixing assembly employing the sheet removal apparatus of the present invention
  • FIG. 2 is an end view partially in section, of the lower fuser roll of the assembly shown in FIG. 1 illustrating the sheet removal apparatus of the present invention positioned in an operative orientation;
  • FIG. 3 is a perspective view of a stripper member forming a part of the present invention.
  • FIG. 1 there is shown a typical heat pressure roll fusing system utilizing the sheet removal apparatus of the present invention.
  • a pair of co-acting fuser rolls including a lower heated roll 11 and an upper back-up roll 12, are rotatably mounted within a support frame 13 and have drive means (not shown) operatively associated therewith for rotating the rolls at synchronous speeds in the direction indicated by the arrows.
  • One of the roll members in this particular case the bottom roll 11, is provided with an internal source of heat energy and it is arranged so that its outer surface contacts the toner image bearing side of a copy sheet 15 as the sheet is transported through the nip of the fuser roll assembly.
  • the lower or heated roll 11 is formed of a resilient blanket 16 which is supported by a rigid core 17 and has a thin layer of relatively abhesive material 18, for example, polytetrafluoroethylene, positioned thereover. Disposed axially through the interior of the rigid core 17 is a quartz heating lamp 19 which functions to transfer the proper amount of energy to the roll member so as to raise the surface temperature thereof to a predetermined operating level.
  • a quartz heating lamp 19 Disposed axially through the interior of the rigid core 17 is a quartz heating lamp 19 which functions to transfer the proper amount of energy to the roll member so as to raise the surface temperature thereof to a predetermined operating level.
  • the upper or back-up fuser roll 12 is made of a relatively rigid cylindrical substrate 20, preferably steel or aluminum, over which is provided a relatively thick sleeve 21 of polytetrafluoroethylene.
  • the two rolls l1 and 12 are mounted in the frame so that the upper resilient roll 12 is deformed against the more rigid lower heated roll 11 thus creating an extended nip therebetween through which the copy sheet is passed during the fusing process.
  • sufficient pressure and heat energy is transferred from the fuser assembly to the copy sheet to effect the desired toner coalescing and consequently image fixing.
  • one of the rolls 11 and 12 could be provided with a flat spot thereon extending the longitudinal axis thereof and the rolls could be so synchronized as to be brought to a rest position whereby the flat portion of the one roll is opposite the other roll.
  • the heated roll is provided with a layer of oil constituting a release agent capable of preventing the toner particles from being offset to the heated roll surface.
  • Silicone based oils have been found to be suitable release agents for this intended purpose.
  • An oil applicatingmechanism is positioned adjacent to the lower portion of the heated fuser roll 11 as illustrated in FIGS. 1 and 2.
  • An applicator wick 26 is mounted in the upper part of the housing 27 and is arranged to contact the lower portion of a heated roll surface.
  • a rotating oil metering cylinder 28 is located directly beneath the wick and serves to transport a predetermined amount of oil from a housing sump region 29 upwardly into contact with the wick surface. Sufficient oil is carried to the wick by the metering roll to allow the wick to apply to the outer periphery of the fuser roll a relatively even layer of oil.
  • the oil layer applied to the fuser roll surface must be thick enough to act as an interface between the roll surface and the copy sheet to prevent toner offsetting but yet must be thin enough to prevent wetting of the copy sheet as it comes through the fuser nip.
  • one or more pickoff or stripper fingers 31 are mounted slightly after the nip of the fuser roll assembly and are arranged to be disposed between the fuser roll surface and the copy sheet moving through the nip. As the copy sheet leaves the fuser nip it comes into contact with the upper surface of the stripper fingers 31. The fingers thus are interposed between the sheet and the fuser roll to thereby redirect the sheet along a predetermined path of travel away from the roll thereby effecting the desired separation of the copy sheet from the fuser roller.
  • the pickoff fingers trap oil or-release agent at the line of contact of the finger with the fuser roll thereby producing an excess amount of oil at such line of contact resulting in transfer of an excessive amount of oil to the copy sheet. Accordingly, the fingers 31 are constructed in a particular manner in order to alleviate the problem of excessive oil accumulation.
  • the sheet removal apparatus of the present invention comprises a pair of pickoff fingers 31 which are pivotably mounted upon the free ends of pivot pins 32.
  • the pivot pins 32 are anchored at one end thereof is generally vertical support members 34 which are, in turn, supported by an elongated member 35 secured to the support frame 13.
  • Each finger is provided with a contacting edge 36 of relatively small thickness formed by a top surface 38 and a bottom surface 39.
  • the fingers are supported in the fuser assembly such that the lower or bottom surface 39 rests on the fuser roll 11 and is retained in that position due to gravitational forces.
  • the pickoff finger 31 comprises an elongated slot 40 beginning at the leading edge 36 and terminating with an aperture 42 rearwardly of the leading edge 36.
  • a pad 44 disposed in the elongated slot 40 and in the aperture 42 serves to absorb the'oil tending to accumulate at the leading edge 36 and by a wicking action carry the oil rearwardly of the leading edge 36 to the portion of the pad 44 disposed in the aperture 42 which serves as a reservoir for the oil.
  • the leading part of the slot 40 acts like a large capillary that would hold the oil picked up from the fuser roll.
  • the oil thus picked up would be held until a second capillary system is provided with a smaller mean capillary radius.
  • the paper, stripper finger contact point constitutes such a smaller capillary which would cause the oil to be transferred to the paper.
  • the slot and aperture are filled with the porous material, for example, absorbent paper, cellulose sponge or nomex sponge, the oil will be wicked away from the tip of the stripper finger thus preventing oil getting onto the paper copy.
  • the picker fingers are preferably constructed of a material that will neither mechanically nor chemically interact with the toner in a manner to cause the toner to adhere to the surfaces thereof.
  • Such materials as aromatic polyesters, as for example, Ebonol as manufactured by the Carborundum Company of Sanborn, New York, which are loaded with trifluoroethylene filler; amide imides, as for example, Amoco All 1L4 as supplied by the Amoco Chemical Company of Seymour, Indiana, which are loaded with a graphite or trifluoroethylene filler, poly imides, as for example, Vespel as manufactured by the Dupont Company, which are coated with a layer of trifluoroethylene have all been found to exhibit non-adhering or abhesive characteristics to toner and are well-suited for the use in such a construction.
  • Apparatus for affixing toner particles to a substrate comprising:
  • a back-up roll forming a nip with said heated roll through which such substrate passes with said toner particlesin contact with said heated roll;
  • stripper means contacting said heated roll and disposed between said heated roll and said substrate for insuring movement of said substrate along a predetermined path, said stripper means including means for conveying excess amounts of said material away from the area of contact of said stripper means with said heated roll.
  • stripper means comprises at least one bifurcated member having said oil absorbent material disposed in the bifurcation.
  • At least one pickoff finger pivotally supported relative to said heated roll such that a leading edge thereof contacts the surface of the heated roll
  • Apparatus according to claim 5 wherein said means associated with said at least one stripper finger comprises an elongated slot extending from said leading edge and communicating rearwardly of said leading edge with a relatively large aperture;
  • said absorbing material is disposed in said elongated slot and said aperture.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
US418538A 1973-11-23 1973-11-23 Stripper finger design to prevent {37 oil-on-the-copy{38 Expired - Lifetime US3881859A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US418538A US3881859A (en) 1973-11-23 1973-11-23 Stripper finger design to prevent {37 oil-on-the-copy{38
CA208,967A CA1026421A (en) 1973-11-23 1974-09-11 Stripper finger design to prevent "oil-on-the-copy"
NL7412271A NL7412271A (enrdf_load_stackoverflow) 1973-11-23 1974-09-16
DE19742444876 DE2444876A1 (de) 1973-11-23 1974-09-19 Fixiervorrichtung zum thermischen fixieren elektroskopischer tonerbilder auf einem traeger
FR7437508A FR2252592B1 (enrdf_load_stackoverflow) 1973-11-23 1974-11-14
JP49132640A JPS5087040A (enrdf_load_stackoverflow) 1973-11-23 1974-11-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US418538A US3881859A (en) 1973-11-23 1973-11-23 Stripper finger design to prevent {37 oil-on-the-copy{38

Publications (1)

Publication Number Publication Date
US3881859A true US3881859A (en) 1975-05-06

Family

ID=23658545

Family Applications (1)

Application Number Title Priority Date Filing Date
US418538A Expired - Lifetime US3881859A (en) 1973-11-23 1973-11-23 Stripper finger design to prevent {37 oil-on-the-copy{38

Country Status (6)

Country Link
US (1) US3881859A (enrdf_load_stackoverflow)
JP (1) JPS5087040A (enrdf_load_stackoverflow)
CA (1) CA1026421A (enrdf_load_stackoverflow)
DE (1) DE2444876A1 (enrdf_load_stackoverflow)
FR (1) FR2252592B1 (enrdf_load_stackoverflow)
NL (1) NL7412271A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955916A (en) * 1975-01-13 1976-05-11 Xerox Corporation Fuser roll sheet stripping apparatus
US3981085A (en) * 1975-02-10 1976-09-21 Xerox Corporation Air stripping device for elastomeric surface
US4035140A (en) * 1975-10-28 1977-07-12 Rank Xerox Ltd. Fixing device in an electrophotographic copying machine
US4052150A (en) * 1976-12-13 1977-10-04 Xerox Corporation Oil wetted fuser roll stripping apparatus
US4080159A (en) * 1976-12-13 1978-03-21 Xerox Corporation Tilting pad stripper finger
US4125362A (en) * 1976-04-28 1978-11-14 Minolta Camera Kabushiki Kaisha Heat roller and toner image fixing device made therewith
US4165965A (en) * 1978-04-03 1979-08-28 International Business Machines Corporation Backup roll cleaning system for a heated roll fuser
US4269594A (en) * 1977-12-07 1981-05-26 Agfa-Gevaert N.V. Contact heat fusing apparatus
US4315622A (en) * 1979-06-28 1982-02-16 Hoechst Aktiengesellschaft Detaching device for sheet material
US4375327A (en) * 1980-12-22 1983-03-01 Konishiroku Photo Industry Co., Inc. Roller fixing device
EP0291319A3 (en) * 1987-05-15 1990-06-27 Xerox Corporation Stripper finger mechanism
US5278617A (en) * 1992-12-04 1994-01-11 Xerox Corporation Modified donor roll
US6735412B2 (en) * 2002-10-04 2004-05-11 Nexpress Solutions Llc Capillary micro-groove skive fingers

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522776U (enrdf_load_stackoverflow) * 1978-08-02 1980-02-14
JPS5836755U (ja) * 1981-09-02 1983-03-10 株式会社リコー 定着装置に於ける分離爪装置
JPS59112262U (ja) * 1983-01-17 1984-07-28 京セラミタ株式会社 熱定着ロ−ラの複写紙剥離装置
JPS6082659U (ja) * 1983-11-11 1985-06-07 シャープ株式会社 定着用剥離爪
JP2008040011A (ja) * 2006-08-03 2008-02-21 Ricoh Co Ltd 定着装置及び画像形成装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2339891A (en) * 1941-02-26 1944-01-25 Beacon Ind Corp Flock adhesive printing apparatus
US2704026A (en) * 1953-08-24 1955-03-15 Edmund A Rogge Doctor blade and mounting for rotogravure printing machines
US3405683A (en) * 1963-06-22 1968-10-15 Azoplate Corp Apparatus for the development of latent electrostatic images
US3537404A (en) * 1968-08-27 1970-11-03 Integral Process Syst Inc Pastry forming apparatus and method
US3660863A (en) * 1969-07-03 1972-05-09 Xerox Corp Cleaning apparatus
US3718116A (en) * 1971-07-20 1973-02-27 Xerox Corp Oil dispensing apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2339891A (en) * 1941-02-26 1944-01-25 Beacon Ind Corp Flock adhesive printing apparatus
US2704026A (en) * 1953-08-24 1955-03-15 Edmund A Rogge Doctor blade and mounting for rotogravure printing machines
US3405683A (en) * 1963-06-22 1968-10-15 Azoplate Corp Apparatus for the development of latent electrostatic images
US3537404A (en) * 1968-08-27 1970-11-03 Integral Process Syst Inc Pastry forming apparatus and method
US3660863A (en) * 1969-07-03 1972-05-09 Xerox Corp Cleaning apparatus
US3718116A (en) * 1971-07-20 1973-02-27 Xerox Corp Oil dispensing apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955916A (en) * 1975-01-13 1976-05-11 Xerox Corporation Fuser roll sheet stripping apparatus
US3981085A (en) * 1975-02-10 1976-09-21 Xerox Corporation Air stripping device for elastomeric surface
US4035140A (en) * 1975-10-28 1977-07-12 Rank Xerox Ltd. Fixing device in an electrophotographic copying machine
US4125362A (en) * 1976-04-28 1978-11-14 Minolta Camera Kabushiki Kaisha Heat roller and toner image fixing device made therewith
US4052150A (en) * 1976-12-13 1977-10-04 Xerox Corporation Oil wetted fuser roll stripping apparatus
US4080159A (en) * 1976-12-13 1978-03-21 Xerox Corporation Tilting pad stripper finger
US4269594A (en) * 1977-12-07 1981-05-26 Agfa-Gevaert N.V. Contact heat fusing apparatus
US4165965A (en) * 1978-04-03 1979-08-28 International Business Machines Corporation Backup roll cleaning system for a heated roll fuser
US4315622A (en) * 1979-06-28 1982-02-16 Hoechst Aktiengesellschaft Detaching device for sheet material
US4375327A (en) * 1980-12-22 1983-03-01 Konishiroku Photo Industry Co., Inc. Roller fixing device
EP0291319A3 (en) * 1987-05-15 1990-06-27 Xerox Corporation Stripper finger mechanism
US5278617A (en) * 1992-12-04 1994-01-11 Xerox Corporation Modified donor roll
US6735412B2 (en) * 2002-10-04 2004-05-11 Nexpress Solutions Llc Capillary micro-groove skive fingers

Also Published As

Publication number Publication date
FR2252592B1 (enrdf_load_stackoverflow) 1977-10-21
DE2444876A1 (de) 1975-05-28
FR2252592A1 (enrdf_load_stackoverflow) 1975-06-20
CA1026421A (en) 1978-02-14
JPS5087040A (enrdf_load_stackoverflow) 1975-07-12
NL7412271A (enrdf_load_stackoverflow) 1974-12-30

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