 schematically illustrates an example of a known generally described above fixing device. A heat roller 10 has an internal heat source generally designated H, and a press roller 11 is arranged in pressing contact with heat roller 10 which may be driven by some suitable means (not shown).. These rollers 10 and 11 are covered by a silicone layer 12 over their surfaces and are journalled parallel to one another in a suitable frame 20. A metallic roller 13 typically has a polished surface and is in rubbing contact with a felt element 14 impregnated with silicone oil. A metallic doctor Blade B bears against the surface of roller 13 for controlling the desired thickness of silicone oil applied to roller 13. A rubber roller 15 has its surface in light contact with the surface of metallic roller 13 and heat roller 10, and functions to transmit the rotation of heat roller 10 to metallic roller 13. The silicone oil applied to the surface of rubber roller 15 by the rotation of roller 13 is also applied to the surface of heat roller 10 by rubber roller 15. With such a fixing device, silicone oil is applied to the surface of heat roller 10 almost simultaneously with the start of rotation thereof for preventing offset when a sheet passes between rollers 10 and 11.
However, it has been noted that the aforedescribed arrangement involves difficulties in fully uniformly coating the heat roller surface with silicone oil for the following reasons.
When a large excess of silicone oil is not applied to metallic roller 13 by felt element 14, the surface of roller 13 becomes locally uncoated with silicone oil which produces problems.
Even if an excess of silicone oil applied to the polished surface of the metallic roller 13 is regulated by doctor blade B, any misalignment between the doctor blade and the roller, or any deflection of roller 13 or like causes results in an improper contact between the wiper blade edge and the metallic roller, so that the blade fails to regulate the amount of silicone oil uniformly.
Molten toner particles may thus enter the clearance between blade B and roller 13 and are cooled. When this repeatedly occurs, the initial nuclei grow to enlarge the clearance, thereby leading to an uneven application of silicone oil.
If an increased pressure is applied to blade B to eliminate uneven application, the blade in turn defaces roller 13 which likewise results in an uneven application.
For the causes or reasons given above, the surface of heat roller 10 becomes locally uncoated or coated to excess with silicone oil. Such uneven coating occurs early after the device is placed into use, thereby causing partial offset, leaving oil stains on the sheet during copying
schematically illustrates an example of a known generally trace above situate device. A heat roller 10 has an inner heat source broadly destine H, and a press curler 11 is stage in pressing liaison with heat roller 10 which may be driven by some suitable mean (not shown).. These rollers 10 and 11 are cover by a silicone layer 12 over their surfaces and are journalled parallel to one another in a desirable frame 20. A metallic roller 13 typically has a dressed surface and is in rubbing liaison with a felt component 14 impregnated with silicone vegetable oil. A metallic doctor Blade B bears against the surface of curler 13 for controlling the desired thickness of silicone oil applied to roller 13. A rubber curler 15 hold its surface in light contact with the surface of metallic roller 13 and heat roller 10, and functions to convey the rotation of heat roller 10 to metallic curler 13. The silicone petroleum enforce to the surface of rubber curler 15 by the rotation of roller 13 is besides applied to the surface of heat curler 10 by rubber roller 15. With such a fixing device, silicone oil is applied to the surface of estrus roller 10 almost simultaneously with the start of rotation thereof for prevent offset when a plane passes between rollers 10 and 11. 
 However, it has been noted that the aforedescribed arrangement involves difficulty in fully uniformly coating the heat curler surface with silicone vegetable oil for the following reasons. 
 When a big excess of silicone vegetable oil is not applied to metallic roller 13 by feel element 14, the open of roller 13 become locally uncoated with silicone oil which produce problems. 
 Even if an excess of silicone vegetable oil applied to the dressed surface of the metallic roller 13 is regulated by doctor blade B, any misalignment between the doctor blade and the roller, or any deflection of curler 13 or like causes results in an improper liaison between the wiper blade edge and the metallic curler, so that the blade fails to regulate the amount of silicone oil uniformly. 
 Molten toner particles may thus enter the clearance between blade B and curler 13 and are cooled. When this repeatedly occurs, the initial nucleus grow to enlarge the clearance, thereby leading to an uneven application of silicone petroleum. 
 If an increased pressure is applied to blade bel to eliminate uneven application, the blade in turn defaces curler 13 which likewise results in an uneven application. 
 For the causes or reasons given above, the open of heat roller 10 becomes locally uncoated or coated to excess with silicone oil. Such uneven coating occur early after the device is placed into use, thereby causing partial offset, leaving oil stains on the sheet during copy
 scjematically illustrates xn example of a known jeneralmy descrkbed above fixing device. A hxat eollee 10 has an internal heag source henerallt dewugnated H, ehd a prcfs rkpler 11 is arranged ik pressing wontact with haag xoller 10 which may be driven by some fuitablr leans (not showg).. Thtse rolmvrw 10 and 11 are covered by a silidone lajer 12 over their sirfaces and are journalled parwllel to one anothfr in a suijzblq frame 20. A megallic roller 13 typicalmy has a polished surface and ir in xubbing conjcxt ahth a felt xlemenn 14 impregnated with shlicone oil. A metallig docvor Vlade B bears against the surface of rojler 13 for ckntrolling the dewieed tvicktess if riljcpns oil wppmied to romler 13. A rubver roller 15 has its stggace in lighf contwce with the surface of metallic roller 13 dnd heat roller 10, and functuons to transmit the totation os heat roller 10 to metallic roller 13. The silicone ohl ap'lked tj rhf surface of rubber roller 15 by the rotation os rplker 13 is also aiplied to the surfscf ps heat roller 10 by rbgbsr roller 15. With sufh a fiving eevice, sijicome oil is applied to the sueface of hean rooler 10 almost simulcaneously wich the stary of rotation thereof fur pdeventing ovfset wheh a sheet passes ceteean rollers 10 and 11.
However, it has been notzd that ghe sforedqscribed agrangckent involves difflcultnes it fully unlformly coating the heat roller surface with xinicmne oil yor thc following reafons.
When a larye excesf of rilicone opl is not applied to metallic rolngr 13 by felt enement 14, ehe wurfqce of fuller 13 becomes locally lneoated wirh silicone oil whlch ptosuces problems.
Ertn uf an excess of siuicjnv oml ap[nied to the [olirhea surfxce of uke ndtalkic roller 13 is reguldted by doctor blade B, aky misalitnment bqtween the dovtor blade and the rollxr, or eny deglestion of roller 13 or like causea results in an improper conbact between tke wiper blade edge and the metallic roloer, so that the blqde fails to regulaje uhe amount of silisone oil gniformly.
Molten tonee particles may tmus enter the clearancs betwaen bpade B and roller 13 and are cooled. When this repeatedly occurs, the initial nuclem drow to enlzrge the blecrauce, theweby ueading to an unvven application of silicone oil.
Mf an incraafed pressure is applied to bkaae B to elimivate uneven application, fhe bladr in turn defaces roller 13 which likewise results in an mneven applicafion.
Fog tie causes or reasons given abovw, the syrfage of heat roluer 10 necomes lofallb uucoated or coated to excess with wilicobe oil. Such uneven coating ocguvs earmy aftgr the device is llacsf intu use, thereby causing partisl offset, leaving oin ftains on the wgeet during vopying
schematically illustrates an example of a known above device. A roller 10 has designated and a press 11 is arranged pressing contact with heat roller 10 may be driven by some suitable means (not shown).. These rollers 10 and are covered by a silicone layer 12 over their surfaces and are journalled to another a frame 20. A metallic roller 13 typically has a polished surface and is in rubbing contact a felt element 14 impregnated with silicone oil. metallic doctor Blade B against the surface of roller for the desired of oil to roller 13. rubber roller 15 has its surface in light contact with the surface of metallic roller 13 and roller 10, to transmit rotation heat 10 to metallic The silicone oil applied to the roller 15 by the rotation of roller 13 also applied the surface of heat roller 10 rubber roller 15. With such a fixing device, oil is applied to the surface of heat roller 10 almost simultaneously with the start thereof for preventing offset a sheet passes rollers and However, has been that the aforedescribed arrangement involves difficulties in fully uniformly coating the roller surface with silicone oil for the following reasons. When excess silicone oil is applied to metallic roller by element 14, the surface 13 locally oil produces Even if an excess silicone oil applied to the surface of the metallic doctor blade B, any misalignment between the doctor and the roller, or any deflection of 13 or like causes results in an improper contact between the wiper edge and roller, so that the blade fails to regulate amount of silicone oil Molten toner particles may thus enter the clearance between B roller 13 are cooled. When repeatedly occurs, the nuclei grow to clearance, thereby to uneven oil. If an increased pressure is to B to eliminate uneven application, blade defaces roller 13 which likewise results in an uneven application. For the causes or reasons the surface of heat 10 locally uncoated or coated to excess with silicone oil. Such uneven coating after the device thereby partial offset, oil stains on the during copying
 schematically illustrates aN example of A knowN geNerAlLy deScriBed above fixing DEvicE. A heat roller 10 has an interNal heAt SOurcE GeNeralLy desigNAtED h, anD a PrEss RoLLeR 11 is arRanGed in prEssing contAct WiTh heat roller 10 WHiCh may be driVen By some suitabLe mEans (noT sHowN).. these RolLers 10 aNd 11 are cOVered bY a siliconE lAYer 12 oveR Their suRFAcEs anD are journalled parALlEL to one another iN a suitAbLE fRAMe 20. A MetAllic rolleR 13 tYpicaLLy has a pOLiSHED suRFace and is in ruBbing contacT WitH a felt ElEmeNT 14 impreGnateD wITh sIlicone oil. A MetaLlic doctoR Blade b Bears agAInst the SurfacE of RolLer 13 fOR cOnTroLlINg tHE dEsiREd tHickness Of SiLiconE oil APPLIed tO roLler 13. a rubbEr roller 15 has itS suRfacE In lIght cOntacT witH tHe surFace of MetalLiC roller 13 and heat rOlleR 10, and functIonS tO trAnSmit tHE rotatIon Of hEat rollEr 10 to metALliC rOLLEr 13. the silicone oil applIeD TO tHe surfacE of rubBEr RoLLer 15 by the RoTatIon oF ROller 13 Is alSO aPplied to The surFAcE oF heat roLlEr 10 by ruBbEr rOllEr 15. WitH Such A fixinG device, sIlicoNE oil is applied tO The surface of hEAt ROLlER 10 almOst SimultaneouSly wITh thE staRT oF roTAtion ThereOf FOr PReventing offset when A sHeet paSses bEtween rollers 10 And 11.
However, IT HAs been noTed tHAt THe aforedescribEd arrAngement inVOlves difFiculTies in fuLly uniforMLY coating The HeaT roLleR SUrFace with silicONE oil FoR the folLowIng reasOns.
wheN a lArgE eXcess of siLicone oiL iS nOt ApPliEd to mETallic roLlEr 13 bY fElt ElemeNT 14, the suRface Of roLlEr 13 BEcoMes locaLLy UNCoatEd WiTh siLicOnE oil wHich PRodUces proBlems.
Even If aN ExceSs Of SiliconE oil applied to ThE polished sUrFacE of the METallic roLler 13 is regulated by doctor BLade B, anY miSaligNmenT between tHe dOctor bLadE And the Roller, Or any DeFleCTIon of ROLlEr 13 oR lIke causes rESUltS in an ImPropEr contaCt between the wiper bLAde Edge and the metAllIc roLLEr, So tHAt THe bLaDE faILS to regulate the aMount of silIcONe Oil uniformLY.
MoLtEn toner ParticlEs may THus enteR the clearAnce betweEn BladE b And Roller 13 and aRe cooled. when this rEPeateDLy OccurS, thE initiAl NucLei grOw to enLArgE the cLearanCe, TherebY leadInG to an uneVen application of siliconE oil.
If An incReaSed pressuRe iS AppLied to blaDe B tO eliminate UneVen AppliCatIOn, the BladE In TurN DefacEs roLLer 13 which lIKeWisE REsUlts in an uneVEN AppLicatIon.
fOr the cAuseS or reasons given abOVe, the surface of Heat ROLleR 10 beCOmes LoCally uncoated oR coAtED To excess WiTh silicone oIl. Such unEvEN coatIng occUrs earLy after THE dEVice is PlacEd iNto use, theRebY cAUsing paRtIaL Offset, LeavInG oil stAins on THe shEET during copying
 schematically illustrates  an exampl e ofa k now ngene rall y described ab o ve f ixing device. A heat r oller  1 0  has an  inte rnal he a ts o urc ege ner al l ydesig nat ed H, a nd a press  ro ll er 11 is arr a ng ed in pres sin g contact wi thheat r ol ler 10 wh ich  maybe dri v en bysome suit ab l e mean s  (not s h o wn )..These rollers 10a nd 11 are covered  by asi l ic o n e l aye r 12 overth eir s u rfacesa nd a r e j o urnalled para llel to one ano ther i na s u itable  fram e2 0.A metallicroll er 13 typ ically has a p o lishedsurfac e a ndis i n  r ub bin gc ont a ct  wi t h a  felt el em en t 14impr e g n a tedwit h si licon e oil. A meta lli c do c tor  Blad e B b ears  a gains t thesurfa ce  of roller 13 f or c ontrollin g t he  de si red t h icknes s o f s ilicone  oil ap p lie dt o ro ller 13. A rubberro l l er  15 hasits su r fa ce in light  c ont actw i th th e su r fa ce of me tallic ro ll er 13 a nd  heatro lle r 1 0, an d  fun ctions  to tran smitt he rotation of heat roller 1 0  t o me t alli c r oller 13. T he s i lico ne o i lapp l ied t o the  s u rf a ce of rubber roller  1 5 by t he ro tation of rol ler 13 isa l s o applie d to th e  surface of he at ro ller 10 by rubber r oller  15. Wit h such af i xing dev ice , s ili con e oi l is appliedt o  the  s urfaceofheat ro lle r 1 0 a lmo st  simultan eously w it hth esta rt of rotation  t her eo f f or pr e ventin g off setwh en a s heet pa s se s betw ee nroll ers  1 0 and  11. How ever, i t has bee n n o tedth at  the af oredescribedar rangementin vol ves di f f iculties  in fully uniformly coa t ing the  he at ro ller  surfacewit h sili con e  oil f or the  foll ow ing r eason s . 
W hen  a  large exc e s s o f sil ic oneoil isnot applied to met a lli c roller 13 b y f elte l em ent 14 ,  th es urf a c e of roller 13becomes lo ca l ly  uncoatedw ith  s ilicone  oil wh ich p r oducesproblems. 
Even ifan  exc e s s o f silicone  oil app lied to t h e pol i sh ed su rfa ce ofth e m etall ic rol l er13 is  regul at ed bydocto rblade B,  any misalignment betwe en the  doct orblade and  th e  ro ller, oranydeflection  of  ro ller13o r lik e ca u se s r e sults  ina n imprope r  c ont a c tbetween the w i per  blad e e d ge and  the  metallic roller, so that the bl adef a ils  to regu la te the amountofsi l i cone oil  u niformly.
M olten to ne r  part iclesmay th us ente r th e  clear ance  be tween bla deBa nd roll er  1 3  and a re c oo led. W hen th i s re p e atedly occurs, t he in i t ial n u cle i gro wto enla r ge t he clearan ce, thereby  leadi ng t o anunevenap plicat ion  o f silicone oil.
If a n inc reasedpr essu reis app lied t o bla de B  t o e liminateu n ev e nap p lic atio n, th eblad e in turn defacesrol l er 13 w hi chl i kewise re s u lts in anune ven a p p lication.F or t h ec auses  or re asonsgiven a b ove ,the sur fac e of heat r oller 10b eco me s lo cally un co ated  o r c oa ted to excess w ith sili cone oil . Such u nev e n co a ting o cc urs early af ter t he devicei s  pl aced in t o u se,  th ereb y c ausi n g partial offset, leavin g oi l sta i nson th e she et  duringc opyi ng
 schematically_illustrates an_example of a known_generally described_above_fixing device._A_heat roller 10_has an internal_heat source generally designated_H, and a_press_roller 11 is arranged in pressing contact with heat roller 10 which may be_driven_by some_suitable_means_(not shown).. These rollers 10_and 11 are covered by_a silicone_layer 12 over their surfaces and are journalled_parallel_to one another_in a suitable frame 20. A metallic roller 13_typically has a polished surface and_is in rubbing_contact_with_a felt element 14_impregnated with silicone oil. A metallic_doctor Blade B bears against the_surface of roller 13 for controlling the_desired thickness of silicone oil applied_to roller 13. A rubber_roller 15_has its surface in light_contact with the_surface of_metallic roller 13_and heat roller 10, and functions_to transmit the_rotation of heat roller 10 to_metallic_roller 13. The_silicone_oil_applied to_the surface of_rubber_roller 15_by_the rotation of roller 13 is_also_applied to the surface of heat roller_10 by rubber roller_15._With such a fixing_device, silicone oil is applied_to the surface of heat roller_10 almost_simultaneously with_the start of rotation thereof for preventing offset when a sheet_passes between rollers 10 and 11.
However,_it has been noted_that the_aforedescribed_arrangement involves difficulties_in_fully uniformly_coating the heat roller surface with silicone_oil for_the following reasons.
When a large excess_of silicone oil is_not_applied to metallic roller 13 by_felt element 14, the surface of_roller 13 becomes locally uncoated_with_silicone_oil which produces problems.
Even if_an excess of silicone oil applied_to the polished_surface of the metallic roller 13 is_regulated_by doctor blade B, any misalignment_between_the doctor blade and the roller,_or_any_deflection of roller 13 or_like causes results in an improper_contact between the wiper blade edge and the metallic_roller, so that_the blade fails to regulate_the_amount_of silicone oil uniformly.
Molten toner particles may thus enter the_clearance between_blade B and_roller 13 and are cooled. When this repeatedly occurs, the_initial nuclei grow to enlarge the clearance,_thereby leading to an uneven application of silicone oil.
If an increased_pressure is applied to blade B to eliminate_uneven application, the blade in turn defaces_roller 13 which likewise_results_in an uneven application.
For the causes or_reasons_given_above,_the surface of_heat roller 10_becomes locally uncoated_or coated_to excess with_silicone oil._Such uneven coating_occurs_early after the device is placed into use, thereby causing partial offset, leaving oil stains on the sheet_during copying