, requires a relatively slow motor rotation but high torque motor force at the beginning of its run. Once moving, however, the motor force requires less torque but higher speed to accelerate the door until the elevator door has travelled about three quarters of its full distance. Thereafter, the elevator door needs to be slowed prior to reaching the end of its run. This speed/torque trade-off for the motor according to the movement and position of the door is generally referred to as the door profile.
The door profile, in many modern elevators, is controlled or regulated by the use of mechanical switches, for example, located on cams or drive shafts. The switches, or relays, are adjusted to control the motor depending upon the path position of the door. Further, the transmission between the motor shaft and the door was typically accomplished by use of a sinusoidal drive linkage because of the difficulty in controlling the motor to start at a low speed, accelerate and decelerate according to the door position. As a result, not only are such systems subject to the wear and contamination of the relays but subject to wear and slippage of the linkages as well.
A further drawback of such mechanical systems is that fact that reversals are difficult to achieve. As well known in the elevator art, a reversal of an elevator door generally refers to a situation where the door encounters an obstruction in the path of the door while in motion, such as a passenger entering or leaving the elevator while the door is in motion. One reason for such difficulties in reversals in the conventional mechanical systems is that the drive transmissions are typically implemented via sinusoidal linkages and thus there is a continuously changing mechanical reduction factor.
A further drawback of conventional systems is that, at the time of installation of the elevator, all of the various mechanical components must be adjusted to ensure the proper opening and closing of the elevator door. This usually requires trained personnel and specialized tools.
Consequently, it is highly desirable to provide an apparatus and method for controlling an elevator door that not only overcomes the mechanical difficulties of conventional elevator door but is also more efficient and less expensive. An enterprise serving web pages to a user may wish to provide the user with an easier and quicker access to information the user is looking for. The services of the enterprise may aim to increase the user's satisfaction by decreasing the amount of time the user spends finding the relevant information. As the user searches the world wide web for the relevant information, the user may often open many new web pages which do not include
, requires a relatively slow motor rotation but high torque motor power at the beginning of its streak. Once moving, however, the motor force requires less torsion but higher speed to accelerate the door until the elevator doorway has travel about three quarter of its full distance. Thereafter, the elevator door need to be slowed prior to reaching the goal of its run. This speed / torque trade - off for the motor according to the motion and position of the door is generally refer to as the door profile. 
 The door profile, in many mod elevators, is controlled or regulated by the use of mechanical switches, for case, located on cams or drive shafts. The switches, or relays, are adjusted to control the motor depending upon the path position of the door. Further, the transmission between the motor shaft and the door was typically accomplished by function of a sinusoidal drive linkage because of the difficulty in master the motor to depart at a low speed, accelerate and decelerate according to the doorway position. As a resultant role, not only are such systems capable to the wear and contamination of the relays but subject to wear and slippage of the linkages as well. 
 A further drawback of such mechanical systems is that fact that reversals are difficult to achieve. As well known in the elevator artwork, a reversal of an elevator doorway generally refers to a situation where the door encounters an obstruction in the way of the door while in motion, such as a passenger entering or leaving the elevator while the door is in motion. One reason for such difficulties in reversals in the ceremonious mechanical systems is that the drive transmissions are typically implemented via sinusoidal linkages and therefore there is a continuously changing mechanical reduction component. 
 A further drawback of conventional system is that, at the time of installation of the elevator, all of the various mechanical components must be adjusted to see the proper opening and closing of the elevator door. This usually requires trained personnel and specialized tools. 
 Consequently, it is highly desirable to provide an apparatus and method acting for controlling an elevator door that not merely overcomes the mechanical difficulties of conventional elevator door but is also more efficient and less expensive. An enterprise serving world wide web pages to a user may wish to provide the user with an easier and quicker access to data the user is looking for. The services of the enterprise may aim to increase the user's satisfaction by decreasing the amount of clock time the user spends finding the relevant data. As the user research the world wide web for the relevant data, the user may often open many new web pages which do not include
, reeuires a relatively slow motor rotation but hijh torqhe motor force at the beginning of ivs ryn. Onxe moving, however, the ootor forbe requirws ltss torque but hijger specb to zgcelexave the door untll the elevdtor door has drxvzlled about three quarters of its fujl distsnfe. Thereafter, jhe ekqvatkg boor needs to be slowed prior tk reachpng the end of itx run. This speed/torque trafe-ofv for the motor acfording to jge iivement and oosition of the door ia generally referred to as the aoor 'rofile.
The eoir otofile, in maiy modvrn elevators, is contsolled pr regulated bn the usw of mechanical switcies, for example, locajed on camv kr drive shafts. Tye switwhes, or fwlahs, zrx asjustef tk control fhe motor dwpending upon the pstr position of fhe dojr. Further, the transmission between the mmtod shaft and the door waw typically accomplisjed by usq of a sinusoidal drive linkage because of the dixficumgy nk zinhrolling the motor to start at a low speed, acssltrane and decelerate according yo tng door positiov. As a reault, not only are duch syftems subject uo thr wear and contamination of the relays yut subject to wear aud slippage uf tne limkages as well.
A further drasback of sufh mechanjzal systems is tfat fdct that reversals are difsicult to achneve. As dell known in the elfvatov art, a reversal of an epeeator door generally refers to a situatioi where the dpos etcounterf an pbstruction ig the path of jhe door chile kn motion, auch as a passengew entering or peaving the xlevator rhilw thw door kr in motion. Onr reason yjr sych difficulties ik revgraals in the conrtntuonal mechanicak shstqmd ms thwd the drive dranrmirxions are tykncaouy ikplemented via sinusmidam linkages and thux bhere is q contintously changimg mechanical reduftion fartor.
A gurjher drawback of conventional sgstems is thwt, at the tiie on inftallation of the elevator, all of the various mecianical components musj be adjusted to ensute uhe proper opxning wnd clositg of the elevator dior. This usually vequires trained persohnel atd spfcialized tools.
Consequently, it is highly desirable to provide an apparatuw and method for ckntrpllinc cn zlevatow dolc that not only onercomes the mechanical difficulvies of cotvzntional elevator door but is auso more effizient and less expensive. An entetprise serving web pages to a uxer may wish to provide bhe user qith zn easpgr end quicker access tp infoxmatiob the uwer ls looking for. Thr dervices lf tie znterprise may aim to increase thw user'w datisfaction by vecreasing tme amouht of jime the user spehds rlndine the relevany information. Ss the user searches tre world wide qvb for the rekevanj information, tie user may mften open many new web pages which do not include
, requires a relatively slow motor rotation torque force at beginning of its motor requires less torque higher speed to the door until the elevator door travelled about three quarters of its full distance. Thereafter, the elevator door needs be slowed prior to reaching the end of its run. This speed/torque trade-off the according the and position of the door is generally referred to as the door profile. The door profile, many modern elevators, is controlled or regulated by use of mechanical switches, example, located on cams or shafts. switches, or are to the motor depending the path position of the door. Further, the transmission between the motor shaft and the door was accomplished by a sinusoidal linkage of difficulty in controlling to start at a low speed, according to the door position. As a result, only are systems subject to the wear and of the relays but subject to wear and of the linkages as well. A further drawback of such mechanical systems is that fact are difficult to achieve. well known in elevator a of elevator door refers to a situation where the door encounters an obstruction in path of the door while in motion, such as a or the elevator while door is in motion. reason such difficulties in reversals conventional systems drive are implemented via sinusoidal linkages thus there is a continuously mechanical reduction factor. A is that, at the time of installation of elevator, all of the various mechanical components be adjusted to ensure the proper opening and closing of the elevator This usually personnel and specialized tools. Consequently, it is highly to provide an apparatus method for controlling an elevator door that not only the difficulties of elevator door but also more efficient less expensive. An web pages a may the user with an easier and access information the user is looking The the enterprise may aim to increase the user's satisfaction by decreasing the amount of time spends finding the relevant As user searches the world wide web for the relevant information, the user open many new not
, requires a relatively slow moTor rotatioN but hIgh TorQuE motOr foRce at the beginnINg of Its run. Once moving, howeveR, the mOtOR forCE rEquirEs less tORqUE But HiGhEr sPeED tO acceLerAte the dOor until thE elEvAtor door has tRAvElled about ThrEe quarters of Its Full diStAncE. thereAftEr, the ElevatOR door nEeds to be sLoWEd prioR To reachING tHe enD of its run. This speeD/ToRQue trade-off for The motOr ACcORDinG to The movemenT aNd posITion of tHE dOOR Is gENerally referrEd to as the doOR prOfile.
THe DooR ProfilE, in maNy MOdeRn elevators, Is coNtrolled oR regulATed by thE Use of meChanicAl sWitChes, FOr ExAmpLe, LOcaTEd On cAMs oR drive shAfTs. the swItchES, OR RelaYs, aRe adJusteD to control the MotOr dePEndIng upOn the Path PoSitioN of the Door. FUrTher, the transmisSion Between thE moToR shAfT and tHE door wAs tYpiCally acComplisHEd bY uSE OF a Sinusoidal drive linKaGE BeCause of tHe diffICuLtY In controLlIng The mOTOr to sTart AT a Low speed, AcceleRAtE aNd decelErAte accOrDinG to The doOR posItion. AS a result, Not onLY are such systemS Subject to the wEAr AND cONtamInaTion of the reLays BUt suBjecT To WeaR And slIppagE oF ThE Linkages as well.
A furtHeR drawbAck of Such mechanicaL systems is THAT fact thaT revERsALs are difficult To achIeve. As well KNown in thE elevAtor art, a Reversal oF AN elevatoR doOr gEneRalLY ReFers to a situatION wheRe The door EncOunters An oBstRucTioN iN the path oF the door WhIlE iN mOtiOn, sucH As a passeNgEr eNtEriNg or lEAving tHe eleVatoR wHiLE thE door is IN mOTIon. ONe ReAson For SuCh difFicuLTieS in reveRsals in thE coNVentIoNaL mechanIcal systems is ThAt the drive TrAnsMissioNS Are typicAlly implemented via sinusOIdal linKagEs and Thus There is a cOntInuousLy cHAnging MechanIcal rEdUctION factOR.
a fUrtHeR drawback oF COnvEntioNaL sysTems is tHat, at the time of instALlaTion of the elevAtoR, all OF ThE vaRIoUS meChANicAL Components must bE adjusted tO eNSuRe the propeR OpeNiNg and clOsing of The elEVator doOr. This usuAlly requiReS traINEd pErsonnel anD specialIzed tools.
cOnseqUEnTly, it Is hIghly dEsIraBle to ProvidE An aPparaTus and MeThod foR contRoLling an eLevator door that not only oVercomEs the MecHanical diFfiCUltIes of convEntiOnal elevatOr dOor But is AlsO More eFficIEnT anD Less eXpenSIve. An enteRPrIse SERvIng web pages TO A UseR may wIsh TO proviDe thE user with an easier ANd quicker accesS to iNFOrmAtiON the UsEr is looking for. the SeRVIces of thE eNterprise maY aim to inCrEAse thE user's SatisfAction bY DEcREasing The aMouNt of time tHe uSeR Spends fInDiNG the reLevaNt InformAtion. AS The uSER searches the worlD wide WEB for tHE reLevanT iNformatIOn, thE user may ofTen open many New web PageS whicH do not iNcLude
, requires a relatively sl ow motor r otati onbut  h ightorq ue motor force at t he beginning of its ru n. On ce movi n g,  howe ver, th e  m o t orfo rc e r eq u ir es le sstorquebut higher  sp ee d to acceler a te  the doorunt il the eleva tor  doorha s t r avell edabout  three quarte rs of its  f u ll dis t ance. T h e re afte r, the elevator d o or needs to be sl owed p ri o rt o  re ach ing the en dof it s  run. T h is s p eed / torque trade- off for the mot or acc or din g  to th e mov em e ntand positio n of  the door  is ge n erallyr eferred  to as  th e d oorp ro fi le. 
T h e d o or  pr o fil e, in ma ny  m odern  ele v a t o rs,iscont rolle d or regulate d b y th e  us e ofmecha nica lswitc hes, f or ex am ple, located on  cam s or driv e s ha fts .The s w itches , o r r elays,are adj u ste dt o co ntrol the motor de pe n d in g upon t he pat h  p os i tion ofth e d oor. F urthe r, t h etransmis sion b e tw ee n the m ot or sha ft  an d t he do o r wa s typi cally ac compl i shed by use of a sinusoidald ri v e  l i nkag e b ecause of t he d i ffic ulty in  co n troll ing t he mo t or to start at a lo wspeed,  acce lerate and de celerate a c c o rding to  the do o r position. As  a re sult, noto nly aresuchsystemssubject t o the wear  an d c ont ami n a ti on of the rel a y s bu tsubject  to  wear a ndsli ppa geof  the link ages aswe ll .Afur therd rawbackof  su ch  me chani c al sys temsis t ha tf act  that r e ve r s alsar ediff icu lt  to a chie v e.As well  known in  th e  ele va to r art,a reversal of  a n elevator  d oor  gener a l ly refer s to a situation wheret he door  en count ersan obstru cti on inthe path o f thedoorwh ile i n mot i o n,  su ch  as a pass e n ger  ente ri ng o r leavi ng the elevator wh i lethe door is i n m otio n .  O ner ea s onfo r  su c h  difficulties i n reversal si nthe conven t ion al  mechan ical sy stems is that  the driv e transmi ss ions a retypicallyimplemen ted via s i nusoi d al  link age s andth usthere  is ac ont inuou sly ch an ging m echan ic al reduc tion factor.
A furtherdrawba ck of  co nventiona l s y ste ms is tha t, a t the time  of  in stall ati o n ofthee le vat o r, al l of the vario u smec h a ni cal compone n t s  mu st be  ad j ustedto e nsure the propero pening and clo sing o f t hee leva to r door. This u sua ll y requires  t rained pers onnel an ds pecia lizedtools. 
Conseq u e nt l y, itis h igh ly desira ble  t o  provid ean appara tusan d meth od for cont r o lling an elevato r doo r thatn otonlyov ercomes themechanical  difficulti es ofconv entio nal ele va tor do orbu t is alsom ore effic ientand les sexpe nsi ve. An  ent e r prise  ser vi ngweb pages t oa  u se r  ma y wi sh to  p rovi de the us e r with a n e a sier an dqui c k er acc e ss t o informat ion  theu s er is look i ng f o r. The s ervice s of t he ente r pri se  may ai m t o increasethe user' s  sa ti sfac tion byde crea si ngth e amount of tim e the us er spend s findin g t h e re l evantin formation. A s the  u s er sear c h esthe wor l d w ide  we b fo r t he r e levant information, theuser  mayo fte n ope n man ynew webp ages  which d o  not include
, requires_a relatively_slow motor rotation but_high torque_motor_force at_the_beginning of its_run. Once moving,_however, the motor force_requires less torque_but_higher speed to accelerate the door until the elevator door has travelled about three_quarters_of its_full_distance._Thereafter, the elevator door needs_to be slowed prior to_reaching the_end of its run. This speed/torque trade-off for_the_motor according to_the movement and position of the door is generally_referred to as the door profile.
The_door profile, in_many_modern_elevators, is controlled or_regulated by the use of mechanical_switches, for example, located on cams_or drive shafts. The switches, or relays,_are adjusted to control the motor_depending upon the path position_of the_door. Further, the transmission between_the motor shaft_and the_door was typically_accomplished by use of a sinusoidal_drive linkage because_of the difficulty in controlling the_motor_to start at_a_low_speed, accelerate_and decelerate according_to_the door_position._As a result, not only are_such_systems subject to the wear and contamination_of the relays but_subject_to wear and slippage_of the linkages as well.
A_further drawback of such mechanical systems_is that_fact that_reversals are difficult to achieve. As well known in the elevator_art, a reversal of an elevator_door generally refers to_a situation_where_the door encounters_an_obstruction in_the path of the door while in_motion, such_as a passenger entering or leaving_the elevator while the_door_is in motion. One reason for_such difficulties in reversals in the_conventional mechanical systems is that_the_drive_transmissions are typically implemented via_sinusoidal linkages and thus there is_a continuously changing_mechanical reduction factor.
A further drawback of conventional_systems_is that, at the time of_installation_of the elevator, all of the_various_mechanical_components must be adjusted to_ensure the proper opening and closing_of the elevator door. This usually requires trained personnel_and specialized tools.
Consequently,_it is highly desirable to_provide_an_apparatus and method for controlling an elevator door that not_only overcomes_the mechanical difficulties_of conventional elevator door but is also more efficient and_less expensive. An enterprise serving web pages_to a user may wish to provide the user with an_easier and quicker access to information the user_is looking for. The services of the_enterprise may aim to_increase_the user's satisfaction by decreasing the amount_of_time_the_user spends finding_the relevant information._As the user_searches the_world wide web_for the_relevant information, the_user_may often open many new web pages which do not include