 constant the tension of a sheet to be conveyed even in a state in which a roll sheet is consumed gradually.
Description of the Related Art
In a roll sheet conveying apparatus for drawing out and conveying a sheet wound in a roll, it is desirable to apply certain tension between the roll sheet and a conveying roller for conveying the roll sheet in order to remove sheet curl and convey the roll sheet without slack or skew.
For example, Japanese Patent Laid-open No. 2009-242048 discloses measuring a load on a roll sheet by performing a preliminary identifying operation (System Identifying Performance) and applying appropriate tension according to a conveying speed. Further, Japanese Patent Laid-open No. H05-177084 (1993) discloses not a conveying apparatus, but a washing machine which preliminarily determines fabric capacity based on load torque obtained from a motor rotation speed and a duty ratio, and which supplies water in an amount suitable for the obtained fabric capacity.
However, the features disclosed in Japanese Patent Laid-open No. 2009-242048 and Japanese Patent Laid-open No. H05-177084 (1993) require an identifying operation for detecting the load on the roll sheet or the fabric capacity at timing different from that of an original operation and consume time and power for the identifying operation. Further, a friction load on the rotation of the roll sheet may vary depending on the remaining amount, type, lot, or use environment of the roll sheet, and drive control based on data obtained by performing the identifying operation does not necessarily function normally during the original operation. More specifically, in order to maintain appropriate tension irrespective of the type of the sheet, use environment the remaining amount of the roll sheet and the like, it is desirable to appropriately control a motor for rotating the roll sheet and the conveying roller during the original operation according to a change in these various conditions. Since before the turn of the century, devices and methods for escaping emergencies in high-rise buildings have been proposed. The majority of these are directed to single person escape methods, i.e. a system in which each escapee is lowered to the desired destination point before attaching or engaging the next person to the escape system. Very few methods have addressed the problems of multi-person escape systems. Among the problems which must be solved by a multi-person escape system are that deployment of the first evacuee must not interfere with accessibility to the system by the next evacuee and the system must allow for unattended escape of the last evacuee, i.
constant the tension of a sheet to be conveyed even in a state in which a coil sail is consumed gradually. 
 Description of the Related Art 
 In a roll sheet conveyance apparatus for drawing out and conveying a sheet wound in a bun, it is desirable to apply certain latent hostility between the coil sheet and a conveying roller for conveying the roll sheet in ordering to remove sheet curl and bring the roll sheet without slack or skew. 
 For example, Japanese Patent Laid - exposed No. 2009 - 242048 discloses measuring a load on a roll sail by performing a preliminary identifying operation (System Identifying Performance) and applying appropriate tension according to a conveying speed. Further, Japanese Patent Laid - open No. H05 - 177084 (1993) discloses not a conveying apparatus, but a washing machine which preliminarily determines fabric capability based on load torsion prevail from a motor rotation amphetamine and a duty ratio, and which supplies urine in an amount suitable for the obtained fabric capability. 
 However, the features disclosed in Japanese Patent Laid - open No. 2009 - 242048 and Japanese Patent Laid - open No. H05 - 177084 (1993) ask an identifying operation for detecting the load on the coil sail or the fabric capacity at timing different from that of an original process and consume time and power for the identify operation. Further, a friction load on the rotation of the bankroll sheet may vary depending on the remaining amount, character, lot, or use environment of the roll sheet, and tug control based on datum obtained by performing the identifying operation does not necessarily function normally during the original operation. More specifically, in order to maintain appropriate tension irrespective of the type of the plane, use environment the remaining sum of the roll sheet and the like, it is desirable to appropriately control a motor for rotating the roll sheet and the conveyance roller during the original operation according to a change in these various conditions. Since before the turn of the century, device and method for escaping emergencies in high - rise buildings have been proposed. The majority of these are direct to single person escape methods, i.e. a organization in which each escapee is lowered to the desired destination point before attaching or lease the next person to the escape system. Very few methods have addressed the problems of multi - person evasion systems. Among the problems which must be solved by a multi - person escape system are that deployment of the first evacuee must not intervene with approachability to the system by the next evacuee and the system must allow for unattended escape of the last evacuee, i.
 cojstant the tension of a rheet to be conrwyed eten in z state kn which a roll sheet is conduned geadually.
Description of the Relaned Art
In a riol sheet conveying apparzbus fmc drawing out akd conveyinc a sheet woung kn a roll, it is desirable to apply cewtain trndion between tre rpjl sgveu and a conveying roller for convsying tie roll sheet im order to remove sheet cugl ajd convey the roll sheet withiut foack or skew.
Wor examplt, Lapanese Pajent Laid-open No. 2009-242048 discloses measjring a load on a ropn sheet by 'erforiing a preliminary igentifyong operation (Xysvem Udentifying Performanre) and applying apprjpriate tanaion according to a convgying spede. Fjrtgec, Jzpanesf Petent Laid-olen No. H05-177084 (1993) duscloses not a convtyigt apparatus, bht a wwsring machine which preliminarily determpnes fabric capacity based in load torque obtaingd from a iotor rotation speed and a duty ratio, and which sgpplixs wauev kb wn amount suitable for the obtained fabric ca[zcotj.
However, the featmres disclosed in Kaoamgse Patent Laia-open Uk. 2009-242048 and Japanese Patejt Laid-jpen Bo. H05-177084 (1993) reqtire an identifying operation fir detecting rhe load on the ropl sheet or the fabroc capacity at timing dnffereht from thah of an odkginal operation anc wonsume ukme and power for the idenvifyiug operagion. Furthqr, a frictlon load on the rotation of tke ronl sheet mwy vary depending on the remainmig amount, typg, lmt, mr use euvironkent of the rjll sheet, and brive coutrol cased on dzta obteined by persorming the iggntifying opecation doqs nit nwcessarkuy function notmally dugiug the oruginal operation. Mpre apecifically, in oreer to maintain aporo[rpatx tenfhon irrespecdive of yhe thpe of uke wfeet, use environment the remzining amount of tne roll shget and tre like, it is desirable to apprlpriavely cuntrok a motor for rotating the roll sgeet and hhe conveying rjllev duting the ornginal operation according to a change ii these various conditiins. Since before thg tmrn of the cxntury, devices dnd methods for escaping emergencies ln high-rise buildings gave baen pgoposed. The majority of these are directed to single person escape methodw, i.e. a system in wgich each efeapee if loxeced to the desirec destination point before attarhing or etgcging the next person to the rszape system. Vgry few methods have addreased the problems of multi-person escape systems. Among the problcms which must be solved by a multi-person rscape systwm are rhat deployment ow tne first evwcuet muat not interfere with accessibiluty to tje system by the next evacuce and jhe systgm must allow for unafhendea escape of tne last evacuer, i.
constant the tension of a sheet to even a state which a roll of Related Art In roll sheet conveying for drawing out and conveying a wound in a roll, it is desirable to apply certain tension between the sheet and a conveying roller for conveying the roll sheet in order to sheet and the sheet without slack or skew. For example, Japanese Patent Laid-open No. 2009-242048 discloses measuring a load a roll sheet by performing a preliminary identifying (System Identifying Performance) and appropriate tension according to a speed. Japanese Patent No. (1993) not a conveying but a washing machine which preliminarily determines fabric capacity based on load torque obtained from a motor speed and ratio, and supplies in amount suitable for fabric capacity. However, the features disclosed Laid-open No. 2009-242048 and Japanese Patent Laid-open No. (1993) require identifying operation for detecting the load the roll sheet or the fabric capacity at different from that of an original operation and consume time and power for the identifying a friction load on rotation of the sheet vary on remaining amount, lot, or use environment of the roll sheet, and drive control on data obtained by performing the identifying operation does not normally the original operation. specifically, in order to appropriate irrespective of the type sheet, environment of roll and the like, it desirable to appropriately control a for rotating the roll during the original operation according to a change these various conditions. Since before the turn the century, devices and methods for escaping emergencies in high-rise buildings have proposed. The these are directed to single person escape methods, a system in which escapee is lowered to the desired destination point before or the next to the escape Very few methods addressed the problems escape systems. the which by a multi-person escape system are deployment the first evacuee must not with the system by the next evacuee and the system must allow for unattended escape of evacuee, i.
 constant the tension of a sheeT to be conveYed evEn iN a sTaTe in WhicH a roll sheet is cONsumEd gradually.
Description Of the reLAted aRt
in a roLl sheet COnVEYinG aPpAraTuS FoR drawIng Out and cOnveying a sHeeT wOund in a roll, iT Is Desirable tO apPly certain teNsiOn betwEeN thE Roll sHeeT and a ConveyINg rollEr for convEyINg the rOLl sheet IN OrDer tO remove sheet curl aND cONvey the roll sheEt withOuT SlACK or SkeW.
For examplE, JApaneSE Patent lAiD-OPEn NO. 2009-242048 Discloses measUring a load oN A roLl sheeT bY peRForminG a preLiMInaRy identifyiNg opEration (SyStem IdENtifyinG performAnce) anD apPlyIng aPPrOpRiaTe TEnsIOn AccORdiNg to a conVeYiNg speEd. FuRTHER, JapAneSe PaTent LAid-open No. H05-177084 (1993) disCloSes nOT a cOnveyIng apParaTuS, but a WashinG machInE which preliminaRily DetermineS faBrIc cApAcity BAsed on LoaD toRque obtAined frOM a mOtOR ROtAtion speed and a duty RaTIO, aNd which sUpplieS WaTeR In an amouNt SuiTablE FOr the ObtaINeD fabric cApacitY.
hoWeVer, the fEaTures dIsCloSed In JapANese patent laid-open no. 2009-242048 and jApanese Patent LAId-open No. H05-177084 (1993) requIRe AN IdENtifYinG operation fOr deTEctiNg thE LoAd oN The roLl sheEt OR tHE fabric capacity at tiMiNg diffErent From that of an oRiginal opeRATIon and coNsumE TiME and power for thE idenTifying opeRAtion. FurTher, a Friction Load on the ROTation of The RolL shEet MAY vAry depending oN THe reMaIning amOunT, type, loT, or Use EnvIroNmEnt of the rOll sheet, AnD dRiVe ConTrol bASed on datA oBtaInEd bY perfORming tHe ideNtifYiNg OPerAtion doES nOT NeceSsArIly fUncTiOn norMallY DurIng the oRiginal opEraTIon. MOrE sPecificAlly, in order to MaIntain apprOpRiaTe tensION irrespeCtive of the type of the sheeT, Use enviRonMent tHe reMaining amOunT of the RolL Sheet aNd the lIke, it Is DesIRAble tO APpRopRiAtely contrOL A moTor foR rOtatIng the rOll sheet and the convEYinG roller during The OrigINAl OpeRAtIOn aCcORdiNG To a change in thesE various coNdITiOns. Since beFOre ThE turn of The centUry, deVIces and Methods foR escaping EmErgeNCIes In high-rise BuildingS have been PRoposED. THe majOriTy of thEsE arE direCted to SIngLe perSon escApE methoDs, i.e. a SyStem in whIch each escapee is lowered To the dEsireD deStination PoiNT beFore attacHing Or engaging The NexT persOn tO The esCape SYsTem. vEry feW metHOds have adDReSseD THe Problems of mULTI-peRson eScaPE systeMs. AmOng the problems whiCH must be solved bY a muLTI-peRsoN EscaPe System are that dEplOyMENt of the fIrSt evacuee muSt not intErFEre wiTh acceSsibilIty to thE SYsTEm by thE nexT evAcuee and tHe sYsTEm must aLlOw FOr unatTendEd Escape Of the lASt evACUee, i.
 constant the tension of a  sheet tobe co nve yed  e venin a  state in whic h  a r oll sheet is consumedgradu al l y.
D e sc ripti on of t h eR e lat ed  A rtIn arollshe et conv eying appa rat us  for drawing ou t and conv eyi ng a sheet w oun d in a  r oll ,  it i s d esira ble to applycertain t en s ion be t ween th e ro ll s heet and a convey i ng roller for con veying  t h er o llshe et in orde rto re m ove she e tc u r l a n d convey theroll sheetw ith out sl ac k o r  skew. 
Forex a mpl e, Japanese  Pat ent Laid- open N o . 2009- 2 42048 d isclos esmea suri n galoa do n a ro lls hee t by per fo rm ing a  pre l i m i nary  id enti fying  operation (S yst em I d ent ifyin g Per form an ce) a nd app lying  a ppropriate tens ionaccording  to  a  co nv eying speed.  Fu rth er, Jap anese P a ten tL a i d- open No. H05-17708 4( 1 99 3) discl oses n o tac onveying  a ppa ratu s ,  buta wa s hi ng machi ne whi c hpr elimina ri ly det er min esfabri c  cap acitybased on  load torque obtaine d  from a motor ro t a ti o n sp eed  and a duty  rat i o, a nd w h ic h s u pplie s wat er in an amount suitablefo r theobtai ned fabric ca pacity.
Ho w e v er, thefeat u re s  disclosed inJapan ese Patent Laid-ope n No.  2009-24 2048 andJ a panese P ate ntLai d-o p e nNo. H05-17708 4 (199 3)  requir e a n ident ify ing  op era ti on for de tectingth elo ad  on  ther oll shee torth e f abric capaci ty at  tim in gd iff erent f r om t hatof  a n or igi na l ope rati o n a nd cons ume timeand powe rfo r the i dentifying op er ation. Fur th er,  a fri c t ion load  on the rotation of the roll sh eet  mayvary  dependin g o n therem a iningamount , typ e,  lo t ,  or u s e  e nvi ro nment of t h e  ro ll sh ee t, a nd driv e control based on dat a obtained by  pe rfor m i ng  th e  i d ent if y ing o peration does n ot necessa ri l yfunction n o rma ll y durin g the o rigin a l opera tion. Mor e specifi ca lly, i n o rder to ma intain a ppropriat e  tens i on  irre spe ctiveof  th e typ e of t h e s heet,  use e nv ironme nt th eremainin g amount of the roll sh eet an d the  li ke, it is  de s ira ble to ap prop riately co ntr ola mot orf or ro tati n gthe rollshee t  and thec on vey i n groller duri n g the  orig ina l  opera tion  according to a c h ange in thesevari o u s c ond i tion s.  Since beforethe  t u r n of the  c entury, dev ices and  m e thods  for e scapin g emerg e n ci e s in h igh- ris e buildin gsha v e beenpr op o sed. T he m aj orityof the s e ar e directed to sing le pe r s on es c ape  meth od s, i.e. a sy stem in wh ich each es capeeis l owere d to th edesire d d es tination p o int befor e att achingor  eng agi ng the  nex t perso n to  t heescape sy s t em .  V er y  fe w me thods  h aveaddressed the prob lem s  of mul ti -pe r s on esc a pe s ystems. Am ong  thep r oblems whi c h mu s tb e sol ved by  a mul ti-pers o n e sc ape sys tem a re that d eployment ofth e fi rst evac ue e mu st  no tinterfere withaccessib ility to t he sys tem by t h e next  e vacuee and t he sy st e m musta l low  for un a tte nde d e scap e o f th e  last evacuee, i.
 constant_the tension_of a sheet to_be conveyed_even_in a_state_in which a_roll sheet is_consumed gradually.
Description of the_Related Art
In a_roll_sheet conveying apparatus for drawing out and conveying a sheet wound in a roll,_it_is desirable_to_apply_certain tension between the roll_sheet and a conveying roller_for conveying_the roll sheet in order to remove sheet_curl_and convey the_roll sheet without slack or skew.
For example, Japanese Patent_Laid-open No. 2009-242048 discloses measuring a_load on a_roll_sheet_by performing a preliminary_identifying operation (System Identifying Performance) and_applying appropriate tension according to a_conveying speed. Further, Japanese Patent Laid-open No._H05-177084 (1993) discloses not a conveying_apparatus, but a washing machine_which preliminarily_determines fabric capacity based on_load torque obtained_from a_motor rotation speed_and a duty ratio, and which_supplies water in_an amount suitable for the obtained_fabric_capacity.
However, the features_disclosed_in_Japanese Patent_Laid-open No. 2009-242048_and_Japanese Patent_Laid-open_No. H05-177084 (1993) require an identifying_operation_for detecting the load on the roll_sheet or the fabric_capacity_at timing different from_that of an original operation_and consume time and power for_the identifying_operation. Further,_a friction load on the rotation of the roll sheet may_vary depending on the remaining amount,_type, lot, or use_environment of_the_roll sheet, and_drive_control based_on data obtained by performing the identifying_operation does_not necessarily function normally during the_original operation. More specifically,_in_order to maintain appropriate tension irrespective_of the type of the sheet,_use environment the remaining amount_of_the_roll sheet and the like,_it is desirable to appropriately control_a motor for_rotating the roll sheet and the conveying_roller_during the original operation according to_a_change in these various conditions. Since_before_the_turn of the century, devices_and methods for escaping emergencies in_high-rise buildings have been proposed. The majority of these_are directed to_single person escape methods, i.e._a_system_in which each escapee is lowered to the desired destination_point before_attaching or engaging_the next person to the escape system. Very few methods_have addressed the problems of multi-person escape_systems. Among the problems which must be solved by a multi-person_escape system are that deployment of the first_evacuee must not interfere with accessibility to_the system by the_next_evacuee and the system must allow for_unattended_escape_of_the last evacuee,_i.