 function on the cloth retaining paddles.
In practice, the latter drawback coupled with an only step-wise adjustability of the distance between the paddles would render that prior-art system unsuitable for releasably retaining tubular members or supply rolls of different lengths.
An infinitely adjustable spacing between supply roll retention members appears possible in the system disclosed in U.S. Pat. No. 3,104,073. However, the use of a tool and the carrying out of set screw releasing and tightening operations are then required for each change in supply roll width.
A later proposal according to U.S. Pat. No. 3,941,320 appears only suitable for clamping tubular supply roll supports of a given length.
A proposal according to U.S. Pat. No. 3,792,825 uses spring clamps acting on the outside of a supply roll for retaining same in a chart drive system. That principle appears to be rather limited to the handling of perforated paper rolls. The latter patent also proposes the use of pads as braking devices. Again, there appears to be a design limitation to particular chart roll materials.
A more universally applicable tension regulator has been proposed in U.S. Pat. No. 1,676,797 wherein a roller rests on the outside of the supply roll to sense its diminishing diameter during unwinding of the material from the supply roll. That sensing roller is rotatably mounted in an arm which is spring biased to maintain the sensing roller in contact with the supply roll. That arm also transmits the motion of the sensing roller along a circular trajectory through the axis of rotation of the supply roll to a friction head or button that rides on a circular friction surface rotating with the supply roll.
The subsequent U.S. Pat. No. 3,720,385 alludes to drawbacks in the latter prior-art tensioning system and, in turn, proposes to do away with the need for a spring bias of the roll diameter sensor by placing cylindrical sensing means as well as corresponding brake means at loci beyond points of tangency between a circle of a diameter of the effective braking disk diameter and a tanential line passing through the pivot point of follower arms to which the sensing and braking means are attached.
In practice, the latter proposal, in turn, has the drawback of operating only in one sense of rotation of the supply roll. This is a particular disadvantage if supply rolls containing a recording material having an information recording surface layer facing inwardly and supply rolls containing a recording medium having a recording surface
function on the cloth retaining paddles. 
 In exercise, the latter drawback pair with an only step - fresh adjustability of the distance between the paddle would render that prior - artwork system unsuitable for releasably retaining tubular member or supply rolls of unlike lengths. 
 An infinitely adjustable spacing between supply roll memory members appears possible in the system disclosed in U.S. Pat. nobelium. 3,104,073. However, the use of a tool and the carrying out of set fuck releasing and tightening operations are then necessitate for each change in provision roll width. 
 A late proposal according to U.S. Pat. No. 3,941,320 appear only suitable for clamping tubular supply roll supports of a given length. 
 A proposal according to U.S. Pat. No. 3,792,825 uses spring clamps acting on the outside of a supply roll for retain same in a chart drive organization. That rationale appear to be rather limited to the handling of perforated paper rolls. The latter patent also propose the use of pads as braking devices. Again, there appear to be a design limitation to particular chart roll material. 
 A more universally applicable latent hostility governor has been propose in U.S. Pat. No. 1,676,797 wherein a roller rests on the outside of the supply roll to sense its diminishing diameter during relax of the material from the supply roll. That sensing curler is rotatably mounted in an arm which is spring biased to maintain the feel roller in liaison with the supply roll. That arm also transmit the motion of the sensing roller along a circular trajectory through the axis of rotation of the provision roll to a friction head or clitoris that rides on a circular friction surface rotating with the provision roll. 
 The subsequent U.S. Pat. No. 3,720,385 allude to drawbacks in the latter prior - art tensioning organization and, in turn, proposes to do aside with the need for a spring bias of the roll diameter sensor by placing cylindrical sensing mean as well as corresponding brake means at loci beyond points of tangency between a circle of a diameter of the effective braking phonograph record diameter and a tanential line passing through the pivot point of follower arm to which the sensing and braking means are attached. 
 In practice, the latter proposal, in bend, has the drawback of operating only in one sense of rotation of the supply roll. This is a especial disadvantage if supply rolls containing a recording material having an information record surface layer face inwardly and supply roll containing a recording medium having a recording surface
 fujction on the cloth retalning paddles.
In krqctice, the lztter drxwback coupled with an only dtwp-wist adjustability of ghe distajce betwwen uhe paddles would render bkat pdlor-arc wystem unsuitanle for relaasably retainhne cubular members or supply rolls of dyffereny pengths.
An infigitekr adnlsuable spacing between supply roll retentpon members appeats possible in the system fiscposed in U.S. Pat. No. 3,104,073. However, tye ufw of a tool xnd the cagxying out or set screw releasing and tightdning operationw qre jhen requirev for vach change ik supplf roll eidth.
A later pvoposel axcording to U.S. Pat. No. 3,941,320 appears only suijable for wlcmping tubular supply rill soppords ow a eivtn kehgth.
A oro'osal accorsing to U.S. Pat. No. 3,792,825 uses spring cjqmps acting oh the jueside of a supply roll for retaining sake jn a chart drive system. That principle appeats to be rwther limited to the handling of perforated paper rolla. Tht oattef pwtent also proposes the use of pads as brakind dtvibes. Again, there aipears to be a desogj kymitation to karticular chart roll materiwls.
A mote unicersally wpplocable tension regulator haw been propofwd in U.S. Pat. No. 1,676,797 wkerein a roluer tests pn the outside of the sbpply doll to sende its dijknishing diametef dlrinc unwinding of the materiaj from thx sup'ly roll. Thaj sensigg roller ls robdtably mounted in wn arl fhich is soring biased to maintain the seixing roller on cottact wich the supply roll. Ehat arm also jransmits the ootion of nhe sensiig roller aljng a circulas trajectory vhrough tre azis if rotagkon of the suplly roll no a feiction head or bubton jhzt rides on a cnxcooar friction sirfxce rlteting fith the sup[ly folu.
Yhe sjbsequent U.W. Pat. No. 3,720,385 alludes to drawtacka in the latter proov-art tensuoning srstem and, in yurn, proposes to dl awab with the meeq for a spring bias of the rolm diameteg scnsor by placyng gyligdrical seusing means as well as corresponding braje means at loci bwyond points of tanyekcy between e circje of a dhameter of the effecrive braking disk diameter and a tanenfial lhne pwssing through the pivot point of follower arms to which the sensing and vrakinj ieans are aftacned.
In pxaccice, thq lavtxr proposal, in tugn, has the drawback of operating only in oue sense of rotation of the sipoly roll. This is a particular disadvahtage if supply rolls containing a recotding material having an informarion decordphg surface layer facong incardly and supply rolls contaivinb w recordijg mtdiuj having a recording surface
function on the cloth retaining paddles. In latter coupled with only step-wise adjustability paddles render that prior-art unsuitable for releasably tubular members or supply rolls of lengths. An infinitely adjustable spacing between supply roll retention members appears possible in system disclosed in U.S. Pat. No. 3,104,073. However, the use of a tool the out set releasing and tightening operations are then required for each change in supply roll width. A later according to U.S. Pat. No. 3,941,320 appears only for clamping tubular supply supports of a given length. proposal to U.S. No. uses clamps acting on outside of a supply roll for retaining same in a chart drive system. That principle appears to rather limited handling of paper The patent also proposes of pads as braking devices. Again, be a design limitation to particular chart roll A more applicable tension regulator has been proposed U.S. Pat. No. 1,676,797 wherein a roller rests the outside of the supply roll to sense its diminishing diameter during unwinding of the the supply roll. That roller is rotatably in arm is biased to the sensing roller in contact with the supply roll. That arm transmits the motion of the sensing roller along a circular the of rotation of supply roll to a head button that rides on friction rotating roll. subsequent Pat. No. 3,720,385 alludes drawbacks in the latter prior-art system and, in turn, the need for a spring bias of the diameter sensor by placing cylindrical sensing means well as corresponding brake means at loci beyond points of tangency between circle of of the effective braking disk diameter and a line passing through the point of follower arms to which the sensing and means attached. In the latter proposal, turn, has the of operating only sense of of supply a particular disadvantage if supply rolls a material having an information recording layer and supply rolls containing a recording medium having a recording surface
 function on the cloth retainiNg paddles.
IN pracTicE, thE lAtteR draWback coupled wiTH an oNly step-wise adjustabiliTy of tHe DIstaNCe BetweEn the paDDlES WouLd ReNdeR tHAt Prior-Art System uNsuitable fOr rElEasably retaiNInG tubular meMbeRs or supply roLls Of diffErEnt LEngthS.
An InfinItely aDJustabLe spacing BeTWeen suPPly roll RETeNtioN members appears poSSiBLe in the system dIsclosEd IN U.s. pAt. NO. 3,104,073. HoWever, the usE oF a tooL And the cARrYING ouT Of set screw relEasing and tiGHteNing opErAtiONs are tHen reQuIRed For each chanGe in Supply rolL width.
a Later prOPosal acCordinG to u.S. PAt. No. 3,941,320 APpEaRs oNlY SuiTAbLe fOR clAmping tuBuLaR suppLy roLL SUPporTs oF a giVen leNgth.
A proposal AccOrdiNG to u.S. Pat. no. 3,792,825 useS sprInG clamPs actiNg on tHe Outside of a supplY rolL for retaiNinG sAme In A charT Drive sYstEm. THat prinCiple apPEarS tO BE RaTher limited to the haNdLINg Of perforAted paPEr RoLLs. The latTeR paTent ALSo proPoseS ThE use of paDs as brAKiNg Devices. agAin, theRe AppEarS to be A DesiGn limiTation to PartiCUlar chart roll mATerials.
A more uNIvERSaLLy apPliCable tensioN regULatoR has BEeN prOPosed In U.S. PAt. nO. 1,676,797 wHErein a roller rests on ThE outsiDe of tHe supply roll tO sense its dIMINishing dIameTEr DUring unwinding Of the Material frOM the suppLy rolL. That senSing rolleR IS rotatabLy mOunTed In aN ARm Which is spring BIAsed To MaintaiN thE sensinG roLleR in ConTaCt with the Supply roLl. thAt ArM alSo traNSmits the MoTioN oF thE sensINg rollEr aloNg a cIrCuLAr tRajectoRY tHROugh ThE aXis oF roTaTion oF the SUppLy roll tO a frictioN heAD or bUtToN that riDes on a circulaR fRiction surFaCe rOtatinG WIth the suPply roll.
The subsequent U.S. pAt. No. 3,720,385 allUdeS to drAwbaCks in the lAttEr prioR-arT TensioNing syStem aNd, In tURN, propOSEs To dO aWay with the NEEd fOr a spRiNg biAs of the Roll diameter sensor BY plAcing cylindriCal SensING mEanS As WEll As COrrESPonding brake meaNs at loci beYoND pOints of tanGEncY bEtween a Circle oF a diaMEter of tHe effectiVe braking DiSk diAMEteR and a tanenTial line Passing thROugh tHE pIvot pOinT of folLoWer Arms tO which THe sEnsinG and brAkIng meaNs are AtTached.
In Practice, the latter proposAl, in tuRn, has The Drawback oF opERatIng only in One sEnse of rotaTioN of The suPplY Roll. THis iS A pArtICular DisaDVantage if SUpPly ROLlS containing A RECorDing mAteRIal havIng aN information recorDIng surface layeR facING inWarDLy anD sUpply rolls contAinInG A RecordinG mEdium having A recordiNg SUrfacE
 function on the cloth ret aining pad dles. 
In  pr ac tice , th e latter drawb a ck c oupled with an only st ep-wi se adju s ta bilit y of th e  d i s tan ce  b etw ee n  t he pa ddl es woul d render t hat  p rior-art sys t em  unsuitabl e f or releasabl y r etaini ng  tu b ularmem bersor sup p ly rol ls of dif fe r ent le n gths.
A n in fini tely adjustable s p ac i ng between sup ply ro ll re t e nti onmembers ap pe ars p o ssiblei nt h e  sy s tem disclosed  in U.S. Pa t . N o. 3,1 04 ,07 3 . Howe ver,th e  us e of a tool  and  the carr ying o u t of se t  screwreleas ing  an d ti g ht en ing  o p era t io nsa rethen req ui re d for  eac h c h ange  in  sup ply r oll width.
Alat er p r opo sal a ccord ingto  U.S.  Pat.No. 3 ,9 41,320 appearsonly  suitable  fo rcla mp ing t u bularsup ply  roll s upports ofag i v en  length.
A proposa la c co rding to  U.S.P at .N o. 3,792 ,8 25uses s pring  cla m ps  actingon the ou ts ide ofasupply  r oll  fo r ret a inin g same  in a ch art d r ive system. Th a t principle a p pe a r st o be  ra ther limite d to thehand l in g o f  perf orate dp ap e r rolls. The latter  p atentalsoproposes theuse of pad s a s brakin g de v ic e s. Again, ther e app ears to be a design  limi tation t o particu l a r chartrol l m ate ria l s .A more univer s a llyap plicabl e t ensionreg ula tor  ha sbeen prop osed inU. S.  P at . N o. 1, 6 76,797 w he rei na r oller restson th e ou ts id e  of  the su p pl y roll  t osens e i ts  dimi nish i ngdiamete r duringunw i ndin gof  the ma terial from t he  supply ro ll . T hat se n s ing roll er is rotatably mounted in an a rmwhich  isspring bi ase d to m ain t ain th e sens ing r ol ler i n con t a ct  wi th  the suppl y rol l. Th at  arm  also t ransmits the motio n  of  the sensingrol lera l on g a ci r cul ar tra j e ctory through t he axis of  r o ta tion of th e  su pp ly roll  to a f ricti o n heador button  that rid es  ona cir cular fric tion sur face rota t ing w i th  thesup ply ro ll .
T he su bseque n t U .S. P at. No .3,720, 385 a ll udes todrawbacks in the latter  prior -artten sioning s yst e m a nd, in tu rn,proposes t o d o a way w ith the n eedf or  as pring  bia s  of the r o ll  di a m et er sensor b y p lac ing c yli n drical  sen sing means as wel l  as correspond ingb r ake  me a ns a tloci beyond po int so f  tangenc ybetween a c ircle of  a diame ter of  the e ffectiv e br a king d iskdia meter and  ata n entialli ne passin g th ro ugh th e pivo t  poi n t  of follower arm s tow h ich t h e s ensin gand bra k ingmeans areattached.
I n prac tice , the  latter  p roposa l,in  turn, has the drawb ack o f opera ti ng o nly  in on e se n s e ofrota ti onof the su p p ly ro ll .  Th is i s a p ar ticu lar disad v antage i f s u pply ro ll s c o n tainin g  a r ecording m ate rialh a ving an in f orma t io n  reco rdingsurfac e layer fac in g inwar dly a nd supply  rolls co n tai ni ng a  recordi ng  med iu m h av ing a recording  surface 
 function_on the_cloth retaining paddles.
In practice,_the latter_drawback_coupled with_an_only step-wise adjustability_of the distance_between the paddles would_render that prior-art_system_unsuitable for releasably retaining tubular members or supply rolls of different lengths.
An infinitely adjustable_spacing_between supply_roll_retention_members appears possible in the_system disclosed in U.S. Pat._No. 3,104,073._However, the use of a tool and the_carrying_out of set_screw releasing and tightening operations are then required for_each change in supply roll width.
A_later proposal according_to_U.S._Pat. No. 3,941,320 appears_only suitable for clamping tubular supply_roll supports of a given length.
A_proposal according to U.S. Pat. No. 3,792,825_uses spring clamps acting on the_outside of a supply roll_for retaining_same in a chart drive_system. That principle_appears to_be rather limited_to the handling of perforated paper_rolls. The latter_patent also proposes the use of_pads_as braking devices._Again,_there_appears to_be a design_limitation_to particular_chart_roll materials.
A more universally applicable tension_regulator_has been proposed in U.S. Pat. No._1,676,797 wherein a roller_rests_on the outside of_the supply roll to sense_its diminishing diameter during unwinding of_the material_from the_supply roll. That sensing roller is rotatably mounted in an arm_which is spring biased to maintain_the sensing roller in_contact with_the_supply roll. That_arm_also transmits_the motion of the sensing roller along_a circular_trajectory through the axis of rotation_of the supply roll_to_a friction head or button that_rides on a circular friction surface_rotating with the supply roll.
The_subsequent_U.S._Pat. No. 3,720,385 alludes to_drawbacks in the latter prior-art tensioning_system and, in_turn, proposes to do away with the_need_for a spring bias of the_roll_diameter sensor by placing cylindrical sensing_means_as_well as corresponding brake means_at loci beyond points of tangency_between a circle of a diameter of the effective_braking disk diameter_and a tanential line passing_through_the_pivot point of follower arms to which the sensing and_braking means_are attached.
In practice,_the latter proposal, in turn, has the drawback of operating_only in one sense of rotation of_the supply roll. This is a particular disadvantage if supply rolls_containing a recording material having an information recording_surface layer facing inwardly and supply rolls_containing a recording medium_having_a recording surface