US3856461A - Reproduction machine fuser - Google Patents

Reproduction machine fuser Download PDF

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Publication number
US3856461A
US3856461A US00407682A US40768273A US3856461A US 3856461 A US3856461 A US 3856461A US 00407682 A US00407682 A US 00407682A US 40768273 A US40768273 A US 40768273A US 3856461 A US3856461 A US 3856461A
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US
United States
Prior art keywords
roll
fuser
bearing
fusing
reproduction machine
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
US00407682A
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English (en)
Inventor
W Jordan
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 US00407682A priority Critical patent/US3856461A/en
Priority to CA206,811A priority patent/CA1041158A/en
Priority to BR6674/74A priority patent/BR7406674D0/pt
Priority to DE2440154A priority patent/DE2440154C3/de
Priority to NLAANVRAGE7413303,A priority patent/NL176983C/xx
Priority to GB4400974A priority patent/GB1472262A/en
Priority to JP11702074A priority patent/JPS5733793B2/ja
Priority to BE149516A priority patent/BE821050A/xx
Priority to IT28411/74A priority patent/IT1022863B/it
Priority to SE7413004A priority patent/SE7413004L/xx
Priority to FR7435222A priority patent/FR2248543B1/fr
Application granted granted Critical
Publication of US3856461A publication Critical patent/US3856461A/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
    • G03G15/2064—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat combined with pressure

Definitions

  • ABSTRACT A fuser apparatus for a reproduction or copying machine, the fuser comprising a heated fixing roll and cooperating pressure roll which together form a nip between which the copy material being fused passes.
  • One or more stripper fingers at the fuser exit cooperate with the fuser rolls to prevent the copy material from sticking thereto.
  • the fuser roll is supported for limited axial displacement relative to the pressure roll.
  • Such fuser roll support is obtained through a movable roll bearing structure, which includes a bearing lock to retain the bearing structure and the fuser roll itself in a selected axial position.
  • a toner developed image, reproduction or copying machines incorporate a fixing device, conventionally called a fuser.
  • the fuser may take many forms, as, for example, a vapor fuser, heat or combination heat-pressure type fusers appear today to be most prevalent.
  • One combination heatpressure fuser consists of the heated fusing roll in physical contact with a relatively soft pressure roll, these rolls cooperating to form a fusing nip between which the copy material being fused pass.
  • the roll surfaces are preferably covered with a release material.
  • stripping fingers are often provided adjacent the fuser exit to strip the fused copy material therefrom.
  • the fingers are normally biased or otherwise held in operative engagement with the fusing roll periphery. Over a period of use, the constant rubbing of the stripper fingers against the roll periphery may wear away the release material and result in lines or grooves being worn in the fusing roll surface. In time, this may have a deleterious effect on fuser operation.
  • fusers incorporate a heat detector or sensor for the purpose of controlling heat input to the fuser and to protect against dangerous overheating.
  • the aforesaid sensor may be arranged to rest or ride against the fuser surface and this in turn may wear away a portion of the release material.
  • This invention relates to a reproduction machine for producing copies of documents, comprising in combination, a fuser for fixing the copy images developed, the fuser having cooperating pressure and heated fusing rolls forming therebetween a nip through which copies to be fused pass, bearing means supporting the.
  • the bearing means being movable in an axial direction to permit the fuser roll to be shifted axially whereby to offset spot wear on the surface of the fuser roll, and locking means for releasably locking the bearing means and the fuser roll in selected position.
  • FIG. 1 is a schematic view of an exemplary reproduction or copying machine incorporating the improved fuser of the present invention
  • FIG. 2 is an enlarged top plane view showing details of the fuser roll support mechanism of the present in- I vention.
  • FIG. 3 is an enlarged side view in section of the fuser shown inFIG. 2.
  • an exemplary copier/reproduction machine designated generally by the numeral 10 and incorporating the improved fuser 38 of the present invention.
  • a light image of a document to be reproduced is projected onto the sensitized surface of a xerographic plate to form an electrostatic latent image thereon.
  • the latent image is developed with an oppositely charged developing material to form a xerographic powder or toner image, corresponding to the latent image on the plate surface.
  • the toner image is then electrostatically transferred to a support or copy material where it is fused by a fusing device so that the toner image is permanently adhered to the copy material.
  • an original document 12 to be copied is placed upon a transparent support platen l4 fixedly arranged in an illumination assembly generally indicated by the reference numeral 15 and disposed at the left end of the machine. While upon the platen, the document 112 is illuminated, thereby producing image rays corresponding to the informational areas on the original. The image rays are projected by means of an optical system onto the photosensitive surface of a xerographic plate.
  • the xerographic plate is in the form of a flexible photoconductive belt 17 supported in a belt assembly 18.
  • the support assembly 118 for photoconductive belt 17 includes three rollers 20, 21, and 22 located with parallel axes at approximately the apices of a triangle.
  • the upper roller 22 is rotatably driven by a suitable motor and drive means (not shown) to drive belt 17 in the direction shown by the arrow in FIG. ll.
  • a suitable motor and drive means not shown
  • the reflected light image of the original document 112 on platen 14 is flashed upon the photoreceptor surface of belt 117 at an exposure station 25 to produce an electrostatic latent image thereon.
  • photoconductive belt 17 carries the electrostatic image through a developing station 26 in which there is positioned a developer assembly generally indicated by the reference numeral 28.
  • a developer assembly generally indicated by the reference numeral 28.
  • latent electrostatic image is developed by means of toner through the use of a multiple magnetic brush system 27.
  • the developed electrostatic image is carried by belt 17 to the transfer station 30 where the developed image is transferred to a copy material such as a sheet 31 of copy paper brought forward between transfer roller 32 and belt 17.
  • a copy material such as a sheet 31 of copy paper brought forward between transfer roller 32 and belt 17.
  • the copy sheet 31 is moved at substantially the same speed as belt 17.
  • a sheet transport mechanism generally indicated at 34 is provided to advance copy sheets 31 along a preset path from a paper handling mechanism generally indicated by the reference numeral 35 to transfer station 30 whereat the developed image is transferred.
  • the copy sheet 31 is stripped from belt 17 and conveyed by the sheet transport mechanism 34 through fuser 38 wherein the toner image is permanently fused or affixed thereto. Following fusing, the finished copy is discharged into output tray 39.
  • Photoconductive belt 17 comprises a photoconductive layer of selenium, which is the light receiving surface and imaging medium for the apparatus, on a conductive backing. Further details regarding the structure of the belt assembly 18 and its relationship with the machine and support therefor may be found in U.S. Pat. No. 3,730,623, issued May 1, 1973, and assigned to the same assignee.
  • Fuser 38 includes a suitable housing 40 within which is disposed a lower heated fuser roll 41 and an upper back-up or pressure roll 42, rolls 41, 42 cooperating to form a nip through which the copy sheets 31 pass.
  • Fuser rolls 41, 42 are driven in the direction shown by the solid line arrows in FIG. 3.
  • one or more stripper fingers 46 are rotatably supported as by shaft 47 in fuser housing 40 at the fuser discharge side such that the leading edge 48 of fingers ride or rest against the surface of fuser roll 41.
  • suitable spring biasing means 49 are provided.
  • Pressure roll 42 includes a rigid internal core 50 which may be steel, for example, over which a relatively thick flexible sleeve-like cover 51 formed from a suitable release material is disposed.
  • Fuser roll 41 similarly has a rigid internal core 54 which may, for example, be copper, having a relatively thin coating 55 of a suitable release material thereover.
  • the relatively thin fuser roll coating 55 may, for example, be applied by spray coating techniques.
  • One suitable release material for both pressure roll cover 51 and fuser roll coating 55 may comprise polytetrafluoroethylene.
  • Sleeve 51 of pressure roll 42 and coating 55 of fuser roll 41 serve to prevent the toner on 'copy sheets 31 from offsetting onto the surface of either roll 41 or 42 as well as to aid in preventing the sheets 31 themselves from sticking to one or the other of fuser and pressure rolls 41, 42, respectively.
  • the center of core 54 is hollow and a suitable heating lamp 56 is disposed therewithin.
  • Heating lamp 56 is connected to a suitable source of electrical power (not shown).
  • heat from lamp 56 radiates to core 54 and is conducted to the exterior coating 55 on the periphery thereof.
  • the heat from fuser roll 41 cooperates with whatever pressure is exerted by pressure roll 42 to fuse the toner developed images on copy sheets 31.
  • Other heating lamp arrangements or heating sources may be used instead of the lamp arrangement illustrated.
  • the metal cores 50, 54 of rolls 41, 42 are each provided with projecting stub shafts 60, 60 and 61, 61' respectively.
  • stub shaft 61 of fuser roll 41 is hollow to accommodate insertion and removal of heat lamp 56 as well as the electrical leads 64 thereto.
  • the stub shafts of fuser and pressure rolls 41, 42, respectively, are used to support rolls 41, 42 in operative engagement with one another, stub shafts 60, 60' of pressure roll 42 being suitably journaled in support arms 68 while stub shafts 61, 61 of fuser roll 41 are rotatably journaled by roller type bearings 74, 75 in fuser housing side walls 66, 67.
  • the pressure roll support arms 68 are pivotally mounted within fuser housing 40 by suitable means (not shown) enabling pressure roll 42 to be separated from fuser roll 41 when desired, i.e., as for servicing of fuser 38, as more fully described in U.S. Pat. No. 3,754,819, issued Aug. 28, 1973, and assigned to the same assignee.
  • Suitable bias means are provided to place pressure roll 42 in operating contact with fuser roll 41.
  • Fuser roll bearings 74, 75 are supported in side walls 66, 67 of fuser housing 40.
  • fuser housing side walls 66, 67 each have bearing bores 70, 70' therethrough within which bearings 74, rest, bores 70, 70 being slightly oversize to permit the supporting bearings 74, 75 for fuser roll 41 to slide axially therewithin.
  • Stub shafts 60, 61 which project from one side of pressure and fuser rolls 42 and 41, respectively, have meshing roll drive gears '76, 77 affixed to the terminal ends thereof. Gears 76, 77 serve to drivedly interconnect the fuser and pressure rolls 41, 42 with each other.
  • a suitable fuser drive shaft 80 is provided to rotate the pressure roll gear 76 in the direction indicated by the solid line arrow in FIG. 3, shaft 80 being drivingly connected to gear 76 by suitable means (not shown).
  • bearings 74, 75 which rotatably support fuser roll 41, are slideably disposed within bearing bores 70, 70' of fuser housing walls 66, 67.
  • the periphery of the outer bearing race 82 of bearing 75 has a pair of spaced grooves 84, 85 extending about the circumference thereof.
  • the outer surface or boss 86 of the fuser housing wall 67 adjoining the bearing bore is relatively flat to present a stop or abutment surface.
  • a bearing lock ring 87 which conveniently may consist of cooperating ring halves, is provided.
  • lock ring 87 is slightly less than the width of grooves 84, 85 to permit ring 87 to be inserted in one or the other as will appear.
  • the inner diameter of ring 87 is substantially equal to the outer diameter of grooves 84, 85 while the outer diameter of ring 87 is somewhat greater than the diameter of bearing bore 70'.
  • An outer bearing cap 90 is provided having an internal bore 91 substantially equal to the diameter of bearing bore 70'.
  • the outer dimension of bearing cap 90 is substantially greater than the outer diameter of locking ring 87 to permit cap 90 to overlay ring 87.
  • Bearing cap 90 which is relied upon to prevent axial displacement of fuser roll 41 in the opposite direction, is provided with a relatively flat inside wall 92 adapted to abut boss 86 on wall 67.
  • wall 92 of bearing cap 90 is recessed at 95. Screws 96 serve to releasably retain bearing cap 911 in place on the fuser housing wall 67.
  • lock ring 87 inter-engagement of lock ring 87 with a selected groove 84 or 85 in the outer bearing race 82 of the fuser roll bearing 75 locates fuser roll 41 against axial displacement in one direction, i.e., in the direction indicated by the solid line arrow of FIG. 2.
  • Lock ring 87 is in turn trapped between boss 86 on fuser housing wall 87 and bearing cap 90 to prevent axial dis placement of the outer race 82 of bearing '75, and fuser roll 41, in the opposite direction, i.e., the dotted line arrow shown in FIG. 2.
  • contact of the stripper fingers 46 with the fuser roll surface may in time wear away the surface coating 55 on fuser roll 41 where fingers 46 contact roll 41.
  • erosion of the release material coating roll 41 may result in the toner offsetting onto the roll surface with attendant degradation in the quality of the copies produced.
  • the eroding or wearing away of the re lease coating on fuser roll 41 may in time result in an uneven or scored roll surface which itself may affect adversely fusing contact between rolls 41, 42 of fuser 38.
  • fuser roll 41 is shifted axially to establish a different surface relationship between fuser roll 41 and the copy sheets 31, as well as between the surface of roll 41 and any other components such as stripper fingers 46 in contact therewith.
  • the aforesaid shifting of fuser roll 41 may be undertaken in accordance with a predetermined servicing routine, i.e., after a preset number of copies, or when inspection of the fuser roll 41 indicates the desirability of doing so.
  • bearing cap 90 is removed by removing attaching screws 96. This permits lock ring 87 to be extracted from the groove 84 or 85 previously used. The entire fuser roll 41 including bearings 74, 75 may then be shifted axially until the unused groove 84 or 85 comes into operative position adjacent fuser housing wall 67. Lock ring 87 may then be inserted into the new groove, and bearing cap 90 reinstalled to lock fuser roll 41 in the new position. As can be appreciated from the aforementioned description, the fuser roll 41 need not be removed from the fuser housing 40 nor need fuser 38 itself be otherwise dis-assembled.
  • lock ring 87 may be first inserted in the selected groove and thereafter serve as a locating stop.
  • fuser roll 41 has been described herein as supported for movement, it will be understood that pressure roll 42 may instead or in addition he supported for axial displacement to accommodate spot wear on the pressure roll surface.
  • a reproduction machine for producing copies of documents including a fuser for fixing the copy images developed, the fuser having cooperating pressure and heated fusing rolls forming therebetween a nip through which the copies to be fused pass, the improvement comprising:
  • said bearing means being movable in an axial direction to permit said fuser roll to be shifted axially relative to said pressure roll whereby to offset spot wear on the surface of said fuser roll;
  • locking means for releasably locking said bearing means and said fuser roll in selected position.
  • reproduction machine in which said reproduction machine includes a frame de fining a bearing stop, said bearing means including an outer bearing ring, said bearing ring having at least two grooves in the outer periphery thereof, each of said grooves representing a preselected roller position, and lock means engageable with a selected one of said grooves and said stop to retain said bearing ring and said roll in selected axial position.
  • locking means cooperable with at least one of said bearings comprising said bearing pair and said frame means to lock said fuser roll in selected axial position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
US00407682A 1973-10-18 1973-10-18 Reproduction machine fuser Expired - Lifetime US3856461A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US00407682A US3856461A (en) 1973-10-18 1973-10-18 Reproduction machine fuser
CA206,811A CA1041158A (en) 1973-10-18 1974-08-12 Reproduction machine fuser
BR6674/74A BR7406674D0 (pt) 1973-10-18 1974-08-13 Aperfeicoamento em maquina de reproducao para producao de copias de documentos e aperfeicoamento em maquina copiadora do tipo eletrostatico
DE2440154A DE2440154C3 (de) 1973-10-18 1974-08-21 Kopiervorrichtung mit Schmelzfixiereinrichtung
NLAANVRAGE7413303,A NL176983C (nl) 1973-10-18 1974-10-09 Smeltinrichting voor reproduceerinrichting.
GB4400974A GB1472262A (en) 1973-10-18 1974-10-10 Imaging apparatus comprising a fuser
JP11702074A JPS5733793B2 (enrdf_load_stackoverflow) 1973-10-18 1974-10-11
BE149516A BE821050A (fr) 1973-10-18 1974-10-14 Dispositif de fusion pour machine de reproduction
IT28411/74A IT1022863B (it) 1973-10-18 1974-10-14 Macchina per riproduzioni per produrre copie di documenti
SE7413004A SE7413004L (enrdf_load_stackoverflow) 1973-10-18 1974-10-16
FR7435222A FR2248543B1 (enrdf_load_stackoverflow) 1973-10-18 1974-10-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00407682A US3856461A (en) 1973-10-18 1973-10-18 Reproduction machine fuser

Publications (1)

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US3856461A true US3856461A (en) 1974-12-24

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US00407682A Expired - Lifetime US3856461A (en) 1973-10-18 1973-10-18 Reproduction machine fuser

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US (1) US3856461A (enrdf_load_stackoverflow)
JP (1) JPS5733793B2 (enrdf_load_stackoverflow)
BE (1) BE821050A (enrdf_load_stackoverflow)
BR (1) BR7406674D0 (enrdf_load_stackoverflow)
CA (1) CA1041158A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145181A (en) * 1977-09-01 1979-03-20 International Business Machines Corporation Apparatus to facilitate jam recovery and hot roll reversal in a fusing assembly
US4872661A (en) * 1984-05-21 1989-10-10 International Business Machines Corporation Roll release mechanism
US5241348A (en) * 1991-11-25 1993-08-31 Xerox Corporation Fusing of copy sheets in skewed arrangement in an electrophotographic apparatus
US5323216A (en) * 1992-04-27 1994-06-21 Eastman Kodak Company Lateral moving fuser station
US5337133A (en) * 1993-07-19 1994-08-09 Xerox Corporation System to extend fuser roll life
US5344058A (en) * 1991-03-05 1994-09-06 Ecrm Trust Method and apparatus for precisely driving film material
US5577441A (en) * 1994-04-19 1996-11-26 Voith Sulzer Paperiermaschinen Gesellschaft Mbh Pressing device for extracting liquid from a pulp web
US8100523B2 (en) 2006-12-19 2012-01-24 Xerox Corporation Bidirectional media sheet transport apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5339237Y2 (enrdf_load_stackoverflow) * 1975-09-11 1978-09-22

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550826A (en) * 1948-04-05 1951-05-01 Hattie B Kuhlik Anvil for sound recording and reproducing machines
US2825217A (en) * 1955-03-01 1958-03-04 Norton Co Ltd Sir James Farmer Mangling machines
US3235934A (en) * 1963-09-11 1966-02-22 Os Nap Inc Oscillatory napping apparatus
US3301550A (en) * 1965-04-27 1967-01-31 Benz & Hilgers G M B H Apparatus for the production of a lateral spacing between a plurality of adjacent cuts produced by longitudinal and cross cutting of a length of material
US3377008A (en) * 1966-04-27 1968-04-09 American Binder Company Of Cal Laterally adjustable web feeding means
US3447730A (en) * 1966-04-15 1969-06-03 Air Reduction Wire feed apparatus
US3449548A (en) * 1966-12-30 1969-06-10 Xerox Corp Fusing device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550826A (en) * 1948-04-05 1951-05-01 Hattie B Kuhlik Anvil for sound recording and reproducing machines
US2825217A (en) * 1955-03-01 1958-03-04 Norton Co Ltd Sir James Farmer Mangling machines
US3235934A (en) * 1963-09-11 1966-02-22 Os Nap Inc Oscillatory napping apparatus
US3301550A (en) * 1965-04-27 1967-01-31 Benz & Hilgers G M B H Apparatus for the production of a lateral spacing between a plurality of adjacent cuts produced by longitudinal and cross cutting of a length of material
US3447730A (en) * 1966-04-15 1969-06-03 Air Reduction Wire feed apparatus
US3377008A (en) * 1966-04-27 1968-04-09 American Binder Company Of Cal Laterally adjustable web feeding means
US3449548A (en) * 1966-12-30 1969-06-10 Xerox Corp Fusing device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145181A (en) * 1977-09-01 1979-03-20 International Business Machines Corporation Apparatus to facilitate jam recovery and hot roll reversal in a fusing assembly
US4872661A (en) * 1984-05-21 1989-10-10 International Business Machines Corporation Roll release mechanism
US5344058A (en) * 1991-03-05 1994-09-06 Ecrm Trust Method and apparatus for precisely driving film material
US5241348A (en) * 1991-11-25 1993-08-31 Xerox Corporation Fusing of copy sheets in skewed arrangement in an electrophotographic apparatus
US5323216A (en) * 1992-04-27 1994-06-21 Eastman Kodak Company Lateral moving fuser station
US5337133A (en) * 1993-07-19 1994-08-09 Xerox Corporation System to extend fuser roll life
US5577441A (en) * 1994-04-19 1996-11-26 Voith Sulzer Paperiermaschinen Gesellschaft Mbh Pressing device for extracting liquid from a pulp web
US8100523B2 (en) 2006-12-19 2012-01-24 Xerox Corporation Bidirectional media sheet transport apparatus

Also Published As

Publication number Publication date
JPS5068345A (enrdf_load_stackoverflow) 1975-06-07
CA1041158A (en) 1978-10-24
BR7406674D0 (pt) 1975-08-05
JPS5733793B2 (enrdf_load_stackoverflow) 1982-07-19
BE821050A (fr) 1975-02-03

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