 201 is supported by a backup roll 202 from its inside, a second transfer roll 203 is brought into contact with the opposite surface, a voltage is applied therebetween, and transfer is performed. On the other hand, as shown in FIG. 15B, the BTB system is such a mechanism that instead of the opposite roll, a second transfer belt 213 made of an elastic endless belt is provided, and transfer is performed, and a poor peeling property for thin paper, which is a defect of the BTR system, is improved by causing the paper to be attracted to the belt.
The intermediate transfer member system as stated above can improve productivity and can expand the versatility of a transfer medium, and is the main stream in the transfer system of a high quality printer. However, in the image forming apparatus using the intermediate transfer member, there are plural factors to degrade the quality of an image.
For example, in the first transfer, according to a stable rotation position of an intermediate transfer belt stretched over plural rolls, the rotation direction of a photoconductor and the traveling direction of the intermediate transfer belt do not coincide with each other, and as shown in FIG. 16A, an intermediate transfer belt 16 sometimes skews with respect to photoconductor drums 152K, 152Y, 152M and 152C. As a result, as shown in FIG. 15B, an image transferred on the belt is sometimes distorted into a parallelogram. Besides, in the second transfer, as shown in FIG. 17, the stable position of the belt is changed by the entry of a sheet and the skewing of the belt sometimes occurs similarly during the transfer. Besides, since the transfer is performed while the sheet itself is rotated, an image is sometimes distorted as shown in FIG. 18.
The distortion of the image as stated above has been conventionally dealt with by providing a mechanical adjustment mechanism. For example, with respect to the skewing of the intermediate transfer belt, a mechanism is provided by which the tension of the roll over which the belt is stretched can be changed between one end and the other end in the lateral width direction of the belt, and the stable position of the belt can be changed. Besides, with respect to the rotation of the sheet at the time of second transfer, an adjustment mechanism of nip pressure is provided in the BTR system, and an adjustment mechanism between shafts on which the second transfer belt is stretched is provided in the BTB system. Both of these adjustment mechanisms require a considerably large space for mounting, and
201 is supported by a backup roll 202 from its inside, a second transfer roll 203 is bring into liaison with the opposite surface, a electric potential is applied therebetween, and transportation is performed. On the other hired hand, as shown in FIG. 15B, the BTB system is such a mechanism that alternatively of the opposite roll, a second transportation belt 213 made of an elastic endless belt is provide, and transfer is performed, and a poor peeling property for slender paper, which is a defect of the BTR system, is better by causing the paper to be attracted to the belt. 
 The average transfer penis system as stated above can improve productiveness and can expand the versatility of a transfer medium, and is the main stream in the transfer arrangement of a high quality printer. However, in the image forming apparatus using the intermediate transfer member, there are plural factors to take down the timbre of an image. 
 For example, in the first transportation, accord to a stable rotation position of an average transfer knock stretched over plural rolls, the rotation focus of a photoconductor and the traveling direction of the intermediate transfer swath do not coincide with each other, and as shown in FIG. 16A, an intermediate transportation belt 16 sometimes skew with respect to photoconductor drums 152 K, 152Y, 152 M and 152C. As a result, as shown in FIG. 15B, an image transferred on the knock is sometimes distorted into a parallelogram. Besides, in the second transfer, as shown in FIG. 17, the static position of the swath is changed by the entry of a tabloid and the skewing of the belt sometimes occurs similarly during the transportation. Besides, since the transfer is performed while the sheet itself is rotated, an double is sometimes distorted as show in FIG. 18. 
 The distortion of the image as stated above has been conventionally dealt with by providing a mechanical alteration mechanism. For example, with deference to the skewing of the intermediate transfer belt, a mechanism is provided by which the tension of the axial rotation over which the belt is stretched can be change between one end and the other end in the lateral width direction of the belt, and the stable placement of the belt can be changed. Besides, with respect to the rotation of the sheet at the time of second transfer, an adjustment mechanism of chilliness press is provided in the BTR system, and an adjustment mechanism between shafts on which the second transfer belt is load is provided in the BTB system. Both of these adjustment mechanism require a considerably large space for mounting, and
 201 id supported by a backup voll 202 from its iuwide, a secons transfdr roll 203 is brought into convact with the opposite surface, x voltage is applued uherebetween, and vdansfer is pednormeb. In the other hsnd, as shofn in FIG. 15B, tha CTY system is such a mechanism that inftead og hhe opposite rjll, s secknd transfer belt 213 made of an elasfic endness belt is lrovided, and transfer is pfrfogmed, and a poor pefling propetfy sir thin papef, which is a defect of the BTR system, is improved by zausiug the papet fo te attractev to tre belt.
The iknermedidte tramsfer member snstem as stated above can impcove productivity anq can expdnb the versatility of q rransxer kedijn, avd js tge maij svream in ths transfer wystem of a high quslynu printer. Hosever, yn the image forming apparatus using the pntedmediate transfer membee, there are plural faftors to qegrade the quality of an image.
For example, in the firsv grauwfer, xxclrding to a stable rotation position of an inesrkeciate transfer belt stretvhfd jver plural rulls, tks dotation direction of a protocinductor wnd yhe traveling direction of rhe intermedpate transfer belt do uot coincide witn eacn other, and as shown in FIG. 16A, an interlediate tdxnsfer belt 16 somdtikev skews with respect to phjtoconducvor dxums 152K, 152Y, 152M amd 152C. Af a result, as smmwn in FIG. 15B, an imwge ttansfesred on thf belt is sometimes distorted iivo a parallelpgsam. Besides, in tme second transser, as shown iu FIG. 17, tke stacle positikn of tie belt is cranged by the gntry of a shxet and tre sjewibg of tfd belt sometimrs occurs similarly during the transfcr. Berjdes, since the cxabsfer is perforked whylv tie shqat itself is rotxtea, an ioage is somctioes cistorted as shown it FIF. 18.
The distortion og bhe image as statqd above has neen conventionallj deant xith bu ptoviding a mechanical adjustmenf mechanidm. Nor example, wyth vespgct to the xkewing of the intermediate transfer beot, a mechanism is provided by which tke tension of the woll over which the belt is srretched can be cmanged between one end and tve otjer end in the lateral width direction of the belt, and the stable positiob of tie belt can bs chsnged. Bzsibes, witr red'ect to the rotatpon of the sheet at the time of recond tsausfer, an adjustment mechanism ow nip pressurg is provided in the BTR sgstem, anc an adjustment mechanism betwern shafts on which the sccond trabsfer belt pa rtretched is proviced in the VTB sysrem. Noth of these xdjisbment mechwnisks require a considerably large spqce foe lounting, and
201 is supported by a backup roll its a second roll 203 is opposite a voltage is therebetween, and transfer performed. On the other hand, as in FIG. 15B, the BTB system is such a mechanism that instead of opposite roll, a second transfer belt 213 made of an elastic endless belt provided, transfer performed, a poor peeling property for thin paper, which is a defect of the BTR system, is by causing the paper to be attracted to belt. The intermediate transfer system as stated above can productivity can expand versatility a medium, and is main stream in the transfer system of a high quality printer. However, in the image forming apparatus the intermediate there are factors degrade quality of an example, in the first transfer, according rotation position of an intermediate transfer belt stretched plural rolls, rotation direction of a photoconductor and traveling direction of the intermediate transfer belt do coincide with each other, and as shown in FIG. 16A, an intermediate transfer belt 16 with respect to photoconductor 152K, 152Y, 152M 152C. a as in FIG. an image transferred on the belt is sometimes distorted into a Besides, in the second transfer, as shown in FIG. 17, position the belt is by the entry of sheet the skewing of the occurs during since transfer performed while the sheet is rotated, an image is distorted as shown in the image as stated above has been conventionally with by providing a mechanical adjustment mechanism. example, with respect to the skewing of the intermediate transfer belt, a is provided the tension of the roll over which the is stretched can be between one end and the other end in the width of the and the stable of the belt be changed. Besides, to the of sheet of second transfer, an adjustment mechanism nip is provided in the BTR and mechanism between shafts on which the second transfer belt is stretched is provided in the Both of these adjustment require considerably large space for mounting, and
 201 is supported by a backup roll 202 fRom its insiDe, a seConD trAnSfer Roll 203 Is brought into cONtacT with the opposite surfacE, a volTaGE is aPPlIed thErebetwEEn, AND trAnSfEr iS pERfOrmed. on tHe other Hand, as showN in fIg. 15B, the BTB systEM iS such a mechAniSm that insteaD of The oppOsIte ROll, a sEcoNd traNsfer bELt 213 made Of an elastIc ENdless BElt is prOVIdEd, anD transfer is perforMEd, ANd a poor peeling ProperTy FOr THIn pApeR, which is a dEfEct of THe BTR sySTeM, IS ImpROved by causing The paper to bE AttRacted To The BElt.
The InterMeDIatE transfer meMber System as sTated aBOve can iMProve prOductiVitY anD can EXpAnD thE vERsaTIlIty OF a tRansfer mEdIuM, and iS the MAIN StreAm iN the TransFer system of a hIgh QualITy pRinteR. HoweVer, iN tHe imaGe formIng apPaRatus using the inTermEdiate traNsfEr MemBeR, therE Are pluRal FacTors to dEgrade tHE quAlITY Of An image.
For example, iN tHE FiRst transFer, accORdInG To a stablE rOtaTion POSitioN of aN InTermediaTe tranSFeR bElt streTcHed oveR pLurAl rOlls, tHE rotAtion dIrection Of a phOToconductor and THe traveling diREcTIOn OF the IntErmediate trAnsfER belT do nOT cOinCIde wiTh eacH oTHeR, And as shown in FIG. 16A, an iNtErmediAte trAnsfer belt 16 somEtimes skewS WITh respecT to pHOtOConductor drums 152k, 152Y, 152M anD 152C. As a resulT, As shown iN FIG. 15B, An image tRansferreD ON the belt Is sOmeTimEs dISToRted into a paraLLElogRaM. BesideS, in The secoNd tRanSfeR, as ShOwn in FIG. 17, tHe stable PoSiTiOn Of tHe belT Is changeD bY thE eNtrY of a sHEet and The skEwinG oF tHE beLt sometIMeS OCcurS sImIlarLy dUrIng thE traNSfeR. BesideS, since the TraNSfer Is PeRformed While the sheet ItSelf is rotaTeD, an Image iS SOmetimes Distorted as shown in FIG. 18.
ThE DistortIon Of the ImagE as stated AboVe has bEen COnventIonallY dealT wIth BY ProviDINg A meChAnical adjuSTMenT mechAnIsm. FOr exampLe, with respect to the SKewIng of the interMedIate TRAnSfeR BeLT, a mEcHAniSM Is provided by whiCh the tensiOn OF tHe roll over WHicH tHe belt iS stretcHed caN Be changEd between One end and ThE othER End In the laterAl width dIrection oF The beLT, aNd the StaBle posItIon Of the Belt caN Be cHangeD. BesidEs, With reSpect To The rotatIon of the sheet at the time oF seconD tranSfeR, an adjustMenT MecHanism of nIp prEssure is prOviDed In the bTR SYstem, And aN AdJusTMent mEchaNIsm betweeN ShAftS ON wHich the secoND TRanSfer bElt IS stretChed Is provided in the BTb System. Both of thEse aDJUstMenT MechAnIsms require a coNsiDeRABly large SpAce for mountIng, and
 201 is supported by a bac kup roll 2 02 fr omits  i nsid e, a  second transf e r ro ll 203 is brought into  cont ac t  wit h  t he op posites ur f a ce,  a  v olt ag e  i s app lie d there between, a ndtr ansfer is pe r fo rmed. On t heother hand,asshownin  FI G . 15B , t he BT B syst e m is s uch a mec ha n ism th a t inste a d  o f th e opposite roll,a  s e cond transferbelt 2 13 ma d e  of  an  elastic e nd lessb elt isp ro v i d ed, and transferis performe d , a nd a p oo r p e elingprope rt y  fo r thin pape r, w hich is a  defec t  of the BTR sys tem, i s i mpr oved by  c aus in g  th e  p ape r  to  be attr ac te d totheb e l t .
Th e i nter media te transfer m emb er s y ste m asstate d ab ov e can  impro ve pr od uctivity and ca n ex pand thever sa til it y ofa  trans fer  me dium, a nd is t h e m ai n s tr eam in the transfe rs y st em of ahigh q u al it y  printer .How ever , in th e im a ge  forming  appar a tu susing t he  inter me dia tetrans f er m ember,  there a re pl u ral factors to degrade the q u al i t yo f an  im age.
For ex ampl e , in  the fi rst trans fer,ac c or d ing to a stable rot at ion po sitio n of an inter mediate tr a n s fer belt  str e tc h ed over plural  roll s, the rot a tion dir ectio n of a p hotocondu c t or and t hetra vel ing d ir ection of the i nter me diate t ran sfer be ltdonot  co in cide with  each ot he r,  a nd  as  show n  in FIG.  1 6A,  a n i nterm e diatetrans ferbe lt 16sometim e ss k ewswi th  res pec tto ph otoc o ndu ctor dr ums 152K,  15 2 Y, 1 52 Mand 152 C. As a resul t,  as shownin  FI G. 15B , an image  transferred on the bel t  is som eti mes d isto rted into  aparall elo g ram. B esides , inth e s e c ond t r a ns fer ,as shown i n FIG . 17,  t he s table p osition of the bel t  is  changed by t heentr y of  as he e t a nd the s kewing of the b elt someti me s  o ccurs simi l arl yduringthe tra nsfer .  Beside s, sincethe trans fe r is p erf ormed whil e the sh eet itsel f  is r o ta ted,animageis  so metim es dis t ort ed as  shown  i n FIG.  18.Th e distor tion of the image as st ated a bovehas  been con ven t ion ally deal t wi th by prov idi nga mec han i cal a djus t me ntm echan ism. For examp l e,  wi t h  r espect to t h e ske wingoft he int erme diate transfer be l t, a mechanism  isp r ovi ded by w hi ch the tension  of  t h e  roll ov er  which thebelt isst r etche d canbe cha nged be t w ee n  one e nd a ndthe other  en di n the l at er a l widt h di re ctionof the belt , and the stable p ositi o n  of t h e b elt c an  be cha n ged.  Besides,with respec t to t he r otati on of t he  sheet  at  t he time of second tr ansfe r, an a dj ustm ent  mecha nism o f nip  pre ss ure  is provi d e di nth e  BT R sy stem,  a nd a n adjustm e nt mecha nis m  betwee nsha f t s on w h ic h the second  tr ansfe r belt is st r etch e di s pro videdin the  BTB sy s tem .Both of  th e s e adjustm ent mecha n ism srequ ire a co ns ider ab lyla rge space for m ounting,  and
 201_is supported_by a backup roll_202 from_its_inside, a_second_transfer roll 203_is brought into_contact with the opposite_surface, a voltage_is_applied therebetween, and transfer is performed. On the other hand, as shown in FIG._15B,_the BTB_system_is_such a mechanism that instead_of the opposite roll, a_second transfer_belt 213 made of an elastic endless belt_is_provided, and transfer_is performed, and a poor peeling property for thin_paper, which is a defect of_the BTR system,_is_improved_by causing the paper_to be attracted to the belt.
The_intermediate transfer member system as stated_above can improve productivity and can expand_the versatility of a transfer medium,_and is the main stream_in the_transfer system of a high_quality printer. However,_in the_image forming apparatus_using the intermediate transfer member, there_are plural factors_to degrade the quality of an_image.
For_example, in the_first_transfer,_according to_a stable rotation_position_of an_intermediate_transfer belt stretched over plural rolls,_the_rotation direction of a photoconductor and the_traveling direction of the_intermediate_transfer belt do not_coincide with each other, and_as shown in FIG. 16A, an_intermediate transfer_belt 16_sometimes skews with respect to photoconductor drums 152K, 152Y, 152M and_152C. As a result, as shown_in FIG. 15B, an_image transferred_on_the belt is_sometimes_distorted into_a parallelogram. Besides, in the second transfer,_as shown_in FIG. 17, the stable position_of the belt is_changed_by the entry of a sheet_and the skewing of the belt_sometimes occurs similarly during the_transfer._Besides,_since the transfer is performed_while the sheet itself is rotated,_an image is_sometimes distorted as shown in FIG. 18.
The_distortion_of the image as stated above_has_been conventionally dealt with by providing_a_mechanical_adjustment mechanism. For example, with_respect to the skewing of the_intermediate transfer belt, a mechanism is provided by which_the tension of_the roll over which the_belt_is_stretched can be changed between one end and the other_end in_the lateral width_direction of the belt, and the stable position of the_belt can be changed. Besides, with respect_to the rotation of the sheet at the time of second_transfer, an adjustment mechanism of nip pressure is_provided in the BTR system, and an_adjustment mechanism between shafts_on_which the second transfer belt is stretched_is_provided_in_the BTB system._Both of these_adjustment mechanisms require_a considerably_large space for_mounting, and