 are configured in several arrangements. For instance, a separate storage tray is sometimes used with the copy sheet returned to the original transfer station as in U.S. Pat. No. 4,067,649 by Hubbard, LeClere and Underhill. A reversing drum and flipper structure is employed in U.S. Pat. No. 4,272,181 by Treseder.
A single flash fuser with a return path to a duplex reversing roller so that the first side is completely handled before the copy sheet is returned over a reversing roller to the image station for second side image processing is shown in the IBM TECHNICAL DISCLOSURE BULLETIN of June 1981 at pages 810-811. Copy sheet return paths for reversing the copy sheet and returning it to the imaging station after hot roll fusing are shown in U.S. Pat. Nos. 4,488,801 by Gibson and 4,496,142 by Iwasaki. U.S. Pat. No. 4,541,705 by Knechtel is somewhat similar except it includes an intermediate set of fuser rollers in the return path. The invention relates to a method and a tensioning device for the continuous straightening of metal strip, in particular thin strip. Within the scope of the invention, thin metal strip is understood to be strip with a thickness of up to 1 mm. For very soft materials, such as zinc, aluminum, etc., the thickness of the strip may be as much as 3 mm, however.
Essentially two methods are known for the continuous straightening of metal strip, i.e; stretcher leveling, in which the metal strip is elongated by being pulled between two sets of tensioning rolls, and the stretching-and-bending method using two or more bending rolls between two sets of tensioning rolls.
If the stretcher leveling method is used on wavy metal strips, fibers or particles of different length are plastically elongated to a different extent and therefore strengthened to varying degrees. In this metal strips zones differing in strength cause undesirable residual waviness. In addition, there is the danger that the strip will break and this danger increases with the stretching ratio. For metal strip with strip sabre or strip dimples, stretcher leveling cannot be used because the strip breaks frequently.
In the stretching-and-bending method metal strip is straightened by combined tensile and bending stresses in the area of bending rolls with a small diameter. The tension applied to
are configured in several arrangements. For instance, a freestanding repositing tray is sometimes used with the copy sheet render to the original transfer station as in U.S. Pat. nobelium. 4,067,649 by Hubbard, LeClere and Underhill. A reversing drum and flipper structure is use in U.S. Pat. No. 4,272,181 by Treseder. 
 A single news bulletin fuser with a return path to a duplex apartment revoke roller so that the inaugural side is completely manage before the copy sheet is returned over a revoke roller to the image station for second side persona processing is shown in the IBM TECHNICAL DISCLOSURE BULLETIN of June 1981 at pages 810 - 811. Copy sheet return path for reversing the copy sheet and returning it to the imaging station after hot roll fusing are shown in U.S. Pat. Nos. 4,488,801 by Gibson and 4,496,142 by Iwasaki. U.S. Pat. No. 4,541,705 by Knechtel is somewhat similar except it includes an intermediate set of fuser rollers in the return way. The invention associate to a method and a tensioning device for the continuous straightening of alloy airstrip, in particular thin strip. Within the oscilloscope of the invention, thin metal strip is understood to be strip with a thickness of up to 1 mm. For very cushy materials, such as zinc, aluminum, etc. , the thickness of the strip may be as much as 3 mm, however. 
 Essentially two methods are known for the continuous straightening of alloy strip, i.e; stretcher leveling, in which the metal strip is elongate by being pulled between two set of tensioning roll, and the stretching - and - bending method using two or more deflect rolls between two sets of tensioning rolls. 
 If the stretcher leveling method is used on wavy metal comic strip, fibers or particle of different length are plastically elongate to a different extent and therefore strengthened to varying degree. In this metal airstrip zones differing in persuasiveness cause undesirable residual curliness. In addition, there is the danger that the comic strip will break and this danger increases with the stretching ratio. For metallic element strip with strip sabre or strip dimples, stretcher grading cannot be used because the strip breaks frequently. 
 In the stretching - and - bending method alloy strip is straightened by combined tensile and bending stresses in the area of bending axial rotation with a humble diameter. The latent hostility put on to
 arf configured in several xrrangements. Fot unstanre, a selarate sgorage tray is sometimes usev wirh tht copy sheet returndd to the originao trensfer station as in U.S. Ict. No. 4,067,649 by Kuubard, LeClere akd Underhiln. A reversing grjm and flipper structure is employed yn U.S. Pst. No. 4,272,181 by Tresedgr.
A spndle rlash fuser with a return path to z dupleq reversing rollet so that the first side id colpletely handled bffore the cipy fyeet is retufned over a reversing toller to the image station for reconb side imagg lrlwessing is whown in the IBM BVCHNICAN DISCLPSURE BULLETIN of Jube 1981 at pages 810-811. Copy shxet return paths for reversinc che copy sheet and reruening it do tfw ioagjnj sfation afver hot rolm fusing arw shown in U.S. Pat. Nps. 4,488,801 by Gibson ans 4,496,142 by Ywwsaki. U.S. Pat. No. 4,541,705 by Knechtel is somewhau simjlar except it includes an intermediate set lf fuser wollers in the return path. The invention relates do a jdthid xbd a tensioning device for the continuous straidgttnikg of metal strii, in particular thon sytip. Within the scope of the invention, thij metal strip is undewstopd to be strip with a thickbess of up tj 1 mm. For very soft materials, ruch as zonc, aluminum, etc., the thncknesa of the stgip may bs as much as 3 mm, fowvver.
Assentially two methods arq known fir tke contivuoux strayghtening lf mebdl strip, i.e; stretcjer lgvelinc, in which the metal strip is elongated bb being pullec tetfeen two sets of tensionind rolls, and thg stretchnng-and-cending menhod usinj two or morq bending rolnd between twm sets os tebsiobing rouus.
If the stretvher leveling methoe is used on wavy ketxm strips, fibers or particles of doffdregt lxngth dre plasticanly dlovbated to a diffeveng exyent and therefore sdrenfthened to varying dcgrees. In this meeal strips zomes differing in surengti causx undexirwble residual waviness. In addifion, therf if the danger thab thg strip wilk break and this danger increases with vhe stretching ratio. Foe metal strip with xurip sabre or stri[ dimples, stretcher leveling xannot be used begause the strip breaks frequantly.
Ln the stretching-and-bending method metal strip is straightened by combinee tensmlq and bendihg syressvs nn che arew of uending rolls witn a small diameter. The tension epplied to
are configured in several arrangements. For instance, storage is sometimes with the copy transfer as in U.S. No. 4,067,649 by LeClere and Underhill. A reversing drum flipper structure is employed in U.S. Pat. No. 4,272,181 by Treseder. A single fuser with a return path to a duplex reversing roller so that the side completely before copy sheet is returned over a reversing roller to the image station for second side image is shown in the IBM TECHNICAL DISCLOSURE BULLETIN June 1981 at pages Copy sheet return paths for the sheet and it the station after hot fusing are shown in U.S. Pat. Nos. 4,488,801 by Gibson and 4,496,142 by Iwasaki. U.S. Pat. No. by Knechtel similar except includes intermediate of fuser rollers return path. The invention relates to a tensioning device for the continuous straightening of strip, in thin strip. Within the scope of invention, thin metal strip is understood to be with a thickness of up to 1 mm. For very soft materials, such as zinc, the thickness of the may be as as mm, Essentially methods are for the continuous straightening of metal strip, i.e; stretcher leveling, in the metal strip is elongated by being pulled between two tensioning and the stretching-and-bending using two or more rolls two sets of tensioning the leveling on metal fibers or particles of length are plastically elongated to different extent and therefore this metal strips zones differing in strength cause residual waviness. In addition, there is the that the strip will break and this danger increases with the stretching For metal strip sabre or strip dimples, stretcher leveling cannot used because the strip frequently. In the stretching-and-bending method metal strip is straightened combined and bending in the area bending rolls with small diameter. The to
 are configured in several arrAngements. FOr insTanCe, a SeParaTe stOrage tray is somETimeS used with the copy sheet rEturnEd TO the ORiGinal TransfeR StATIon As In u.S. PAt. nO. 4,067,649 bY HubbArd, leClere And UnderhiLl. A ReVersing drum aND fLipper struCtuRe is employed In U.s. Pat. No. 4,272,181 By treSEder.
A SinGle flAsh fusER with a Return patH tO A dupleX ReversiNG RoLler So that the first sidE Is COmpletely handlEd befoRe THe COPy sHeeT is returneD oVer a rEVersing ROlLER To tHE image station For second siDE imAge proCeSsiNG is shoWn in tHe ibM TeCHNICAL DIScLOSuRE BULLETiN of JuNE 1981 at pageS 810-811. copy sheEt retuRn pAthS for REvErSinG tHE coPY sHeeT And ReturninG iT tO the iMagiNG STAtioN afTer hOt rolL fusing are shoWn iN U.S. PAT. NoS. 4,488,801 by GiBson aNd 4,496,142 by iwAsaki. u.S. Pat. NO. 4,541,705 by KnEcHtel is somewhat sImilAr except iT inClUdeS aN inteRMediatE seT of Fuser roLlers in THe rEtURN PaTh. The invention relaTeS TO a Method anD a tensIOnInG Device foR tHe cOntiNUOus stRaigHTeNing of meTal strIP, iN pArticulAr Thin stRiP. WiThiN the sCOpe oF the inVention, tHin meTAl strip is underSTood to be strip WItH A ThICkneSs oF up to 1 mm. For vEry sOFt maTeriALs, SucH As zinC, alumInUM, eTC., the thickness of the sTrIp may bE as muCh as 3 mm, however.
essentiallY TWO methods Are kNOwN For the continuoUs strAightening OF metal stRip, i.e; StretcheR leveling, IN Which the MetAl sTriP is ELOnGated by being pULLed bEtWeen two SetS of tensIonIng RolLs, aNd The stretcHing-and-bEnDiNg MeThoD usinG Two or morE bEndInG roLls beTWeen twO sets Of teNsIoNIng Rolls.
If THe STRetcHeR lEvelIng MeThod iS useD On wAvy metaL strips, fiBerS Or paRtIcLes of diFferent length ArE plasticalLy EloNgated TO A differeNt extent and therefore strENgtheneD to VaryiNg deGrees. In thIs mEtal stRipS Zones dIfferiNg in sTrEngTH Cause UNDeSirAbLe residual WAVinEss. In AdDitiOn, there Is the danger that the STriP will break and ThiS danGER iNcrEAsES wiTh THe sTREtching ratio. For Metal strip WiTH sTrip sabre oR StrIp Dimples, StretchEr levELing canNot be used Because thE sTrip BREakS frequentlY.
In the stRetching-aND-bendINg MethoD meTal strIp Is sTraigHtened BY coMbineD tensiLe And benDing sTrEsses in tHe area of bending rolls witH a smalL diamEteR. The tensiOn aPPliEd to
 are configured in several  arrangeme nts.For  in st ance , aseparate stora g e tr ay is sometimes used w ith t he copy sh eet r eturned to t heor ig ina lt ra nsfer  st ation a s in U.S.Pat .No. 4,067,64 9  b y Hubbard,  Le Clere and Un der hill.Arev e rsing  dr um an d flip p er str ucture is  e m ployed in U.S. P at . No . 4,272,181 by Tr e se d er.
A single f lash f us e rw i tha r eturn path  t o a d u plex re v er s i n g r o ller so thatthe first s i deis com pl ete l y hand led b ef o rethe copy sh eetis return ed ove r  a reve r sing ro ller t o t heimag e  s ta tio nf ors ec ond sid e imagepr oc essin g is s h o wn i n t he I BM TE CHNICAL DISCL OSU RE B U LLE TIN o f Jun e 19 81  at p ages 8 10-81 1.  Copy sheet ret urnpaths for  re ve rsi ng  thec opy sh eet  an d retur ning it toth e i ma ging station after  h o t  r oll fusi ng are sh ow n  in U.S.  P at.  Nos . 4,488 ,801 by  Gibsonand 4, 4 96 ,1 42 by I wa saki.U. S.Pat . No. 4,54 1,705by Knech tel i s  somewhat simi l ar except iti nc l u de s  anint ermediate s et o f  fus er r o ll ers in th e ret ur n  p a th. The invention r el ates t o a m ethod and a t ensioningd e v ice forthec on t inuous straigh tenin g of metal strip, i n par ticularthin stri p .  Withinthe  sc ope  of t he  invention, t h i n me ta l strip  is  unders too d t o b e s tr ip with a  thickne ss  o fup  to  1 mm .  For ver ysof tmat erial s , such  as z inc,  a lu m inu m, etc. ,  t h e  thi ck ne ss o f t he  stri p ma y  be  as muc h as 3 mm , h o weve r. 
E ssentia lly two metho ds  are known  f orthe co n t inuous s traightening of metal s t rip, i. e;stret cher  leveling , i n whic h t h e meta l stri p isel ong a t ed by b ei ngpu lled betwe e n  tw o set sof t ensioni ng rolls, and thes tre tching-and-be ndi ng m e t ho d u s in g  tw oo r m o r e bending rolls  between t wo se ts of tens i oni ng  rolls. 
If the  stre t cher le veling me thod is u se d on w avy  metal str ips, fib ers or pa r ticle s  o f dif fer ent le ng thare p lastic a lly  elon gatedto  a dif feren textent a nd therefore strengthen ed tovaryi ngdegrees.Int his  metal st rips  zones dif fer ing  in s tre n gth c ause un des i rable  res i dual wavi n es s.I n  a ddition, th e r e  is  thedan g er tha t th e strip will brea k  and this dang er i n c rea ses with  t he stretchingrat io . For meta lstrip withstrip sa br e  or s trip d imples , stret c h er leveli ng c ann ot be use d b ec a use the  s tr i p brea ks f re quentl y.
Int he s t r etching-and-bend ing m e t hod m e tal  stri pis stra i ghte ned by com bined tensi le and  ben dingstresse sin the  ar ea  of bendin g  rolls wi th asmall d ia mete r.The te nsio n appli ed t o
 are_configured in_several arrangements. For instance,_a separate_storage_tray is_sometimes_used with the_copy sheet returned_to the original transfer_station as in_U.S._Pat. No. 4,067,649 by Hubbard, LeClere and Underhill. A reversing drum and flipper structure_is_employed in_U.S._Pat._No. 4,272,181 by Treseder.
A single_flash fuser with a return_path to_a duplex reversing roller so that the first_side_is completely handled_before the copy sheet is returned over a reversing_roller to the image station for_second side image_processing_is_shown in the IBM_TECHNICAL DISCLOSURE BULLETIN of June 1981_at pages 810-811. Copy sheet return_paths for reversing the copy sheet and_returning it to the imaging station_after hot roll fusing are_shown in_U.S. Pat. Nos. 4,488,801 by_Gibson and 4,496,142_by Iwasaki._U.S. Pat. No._4,541,705 by Knechtel is somewhat similar_except it includes_an intermediate set of fuser rollers_in_the return path._The_invention_relates to_a method and_a_tensioning device_for_the continuous straightening of metal strip,_in_particular thin strip. Within the scope of_the invention, thin metal_strip_is understood to be_strip with a thickness of_up to 1 mm. For very_soft materials,_such as_zinc, aluminum, etc., the thickness of the strip may be as_much as 3 mm, however.
Essentially two_methods are known for_the continuous_straightening_of metal strip,_i.e;_stretcher leveling,_in which the metal strip is elongated_by being_pulled between two sets of tensioning_rolls, and the stretching-and-bending_method_using two or more bending rolls_between two sets of tensioning rolls.
If_the stretcher leveling method is_used_on_wavy metal strips, fibers or_particles of different length are plastically_elongated to a_different extent and therefore strengthened to varying_degrees._In this metal strips zones differing_in_strength cause undesirable residual waviness. In_addition,_there_is the danger that the_strip will break and this danger_increases with the stretching ratio. For metal strip with_strip sabre or_strip dimples, stretcher leveling cannot_be_used_because the strip breaks frequently.
In the stretching-and-bending method metal strip_is straightened_by combined tensile_and bending stresses in the area of bending rolls with_a small diameter. The tension applied to