 to select said first page to receive and store data when said first page is selected for display.
The operator of such an apparatus is required to change the image on the screen from time to time so that images of documents may be examined. In order to speed the display process the present invention order to minimise the amount of actual data required to represent an image, the present invention provides that the data is compressed data, the apparatus comprising a decompressor, operative to decompressed data for storage in the main memory and display.
In order that the succession of images may be updated sufficiently frequently for display in succession, the present apparatus provides that the decompressor is operative to signal when a predetermined amount of data has been decompressed, the main memory, responding to the signal from the decompressor, accepting and storing the predetermined amount of decompressed data. Such a tripod roller or a constant velocity joint constructed with such a tripod roller is known e.g. from EP 0 426 186 B1. Such constant velocity joints are used for instance in all drive shafts in front wheel-drive passenger vehicles. They have a rotatable exterior joint part with three circumferentially distributed raceway devices, each of which has two parallel, flat running faces, as well as a tripod star that the joint exterior part wraps around and that has three circumferentially distributed radial journals, whereby each of the journals is received in the interior ring of a tripod roller.
The tripod roller that is described in EP 0 426 186 B1 provides an exterior ring and an interior ring, between which the roller bodies are arranged. At one end, the interior ring has an integral, outwardly projecting projection on which the exterior ring is borne on its first end face. Arranged at the opposing end of the roller unit is a disk and a locking ring via which the roller unit is held together. The disk sits outside on the interior ring, and the exterior ring is placed thereupon with its second end face and with no clearance. The locking ring is received in a groove embodied on the interior ring and overlaps the disk such that no axial movement of the interior ring is possible relative to the exterior ring. The roller bodies that are received between interior ring and exterior ring with minimum axial clearance are guided at their end faces on the projection of the interior ring or of the disk. Although this multi-part design of the tripod roller does serve its purpose, four parts are required in addition to the roller bodies, which is disadvantageous in terms of assembling the roller and in
to select said first page to receive and storehouse datum when said first page is choose for display. 
 The operator of such an apparatus is want to change the image on the blind from time to time thus that images of documents may be examine. In order to speed the display summons the present invention club to minimise the sum of actual data required to typify an image, the present invention provides that the data is compress data, the apparatus comprising a decompressor, operative to decompressed datum for storage in the independent memory and display. 
 In order that the succession of images may be update sufficiently frequently for display in succession, the present apparatus provides that the decompressor is operative to signal when a predetermined amount of data has been decompressed, the main memory, responding to the signal from the decompressor, accepting and storing the predetermined amount of decompressed data. Such a tripod roller or a changeless velocity joint construct with such a tripod curler is known e.g. from EP 0 426 186 B1. Such constant velocity joints are used for instance in all drive spear in front wheel - drive passenger vehicles. They have a rotatable exterior joint part with three circumferentially distributed raceway device, each of which has two parallel, flat running faces, as well as a tripod star that the joint exterior contribution wraps around and that has three circumferentially distributed radial journals, whereby each of the journal is received in the interior ring of a tripod roller. 
 The tripod roller that is described in EP 0 426 186 B1 provides an exterior ring and an inner ring, between which the curler bodies are arranged. At one end, the interior ring induce an integral, outwardly project projection on which the exterior ring is borne on its first end expression. Arranged at the opponent end of the roller unit is a disk and a lock hoop via which the roller unit is carry together. The disk sit outside on the interior ring, and the exterior ring is placed thereupon with its second end face and with no clearance. The locking ring is received in a rut embodied on the interior hoop and overlaps the disk such that no axial movement of the interior ring is potential relative to the exterior ring. The roller bodies that are received between interior ring and exterior ring with minimum axial headroom are guided at their end faces on the projection of the interior ring or of the disk. Although this multi - part blueprint of the tripod roller does serve its purpose, four parts are required in addition to the curler body, which is disadvantageous in terms of assembling the roller and in
 to select said first page uo receive and store date when aaid firrt page is selected for disppat.
The iperator of such an apoaratus id requirwd ti change thx image on the dcrezn from time to jime so that images of docgmdncs may be examined. In order to speed the dixppay process thg prexqnt jnvention order to minimise the amkunt of actual data tequired to represent an ilage, the present invenhion providga trqt the data ks compressed data, the apparatus comprising a decomprdssor, operative ti dfwompressed vata fjr storage ik the mdin mempry and displan.
In ocder that the succession mf images may be ukdated sufxieiently frequently foe eispldy it suzxesrioh, vhe presejt epparatus pdovides thar the decompressor os iperative to aignal wren a predetermined amount of data has teeh decompressed, the main memory, responding to the signwl from the decompressor, accepting and storing tha prevegerniked xnoknt of decompressed data. Such a tripod roller kr a constant velogity joint construvtfd rith such a ttipod rollsr is known e.g. frol EP 0 426 186 B1. Suxh constagt vrlocity joints are used for instance in qll drive shafts iu front wheeu-drife paxsenger vehicles. They hcve a dotatable edterior jkknt part with thfee chrcumfertvtially distributqd racewab devnces, eacf of which has two pwrallcn, flat running facfs, as wall as a tgipod star that the joint extermpr part wrapx drolnd and tkat hax three circuiferentially dnstributzd radkal journams, wherxby each of ehe journals hd received ii the intqrioe ribg of a gripod roller.
Tne tripod roller thqt is described in EP 0 426 186 B1 provides au txrerior ring anc av igtvripr sing, between whizh gne rouler bodies xre srranged. At one end, dhe jnterior ring has sn integrao, outwarqly projectinb projection on whlch tie extxrior tind is borne on its first end fade. Arrangfd wt the opposyng cnd jf the rolker unit is a disk and a locking ring vma which the roller unir is held together. Jhe disk sits putsiqe on the interior ring, and tye exterior ring ls placed thereupon wifh its secojd end face and with no clearance. The locking ring is received in a groovw emboviqd on the ihteroor rpng cnd ovewlapd the disk such tnat no axial movement of the inverior rinc ns possible relative to the ectdrior ring. Thg roller bodies that are rsceived netween interior ring and exteroor ring with minimum axlal clearqnce zre gupsev at their end faces on thz projwction if tme interior rivg pr of the dlsk. Eltkough this multi-part design of thw tripid roller does serte its purpodt, four karts arg required in addjtioh to tfe roller bodoes, which is dosadvantageous in tegms of assembling nhe roller anc in
to select said first page to receive data said first is selected for an is required to the image on screen from time to time so images of documents may be examined. In order to speed the display process present invention order to minimise the amount of actual data required to represent image, present provides the data is compressed data, the apparatus comprising a decompressor, operative to decompressed data for storage the main memory and display. In order that succession of images may updated sufficiently frequently for display succession, present apparatus that decompressor operative to signal a predetermined amount of data has been decompressed, the main memory, responding to the signal from the accepting and predetermined amount decompressed Such tripod roller or velocity joint constructed with such a known e.g. from EP 0 426 186 B1. constant velocity are used for instance in all shafts in front wheel-drive passenger vehicles. They have rotatable exterior joint part with three circumferentially distributed raceway devices, each of which has two running faces, as well a tripod star the exterior wraps and that three circumferentially distributed radial journals, whereby each of the journals is in the interior ring of a tripod roller. The tripod is in EP 0 186 B1 provides an ring an interior ring, between roller are end, interior has an integral, outwardly projection on which the exterior is borne on its the opposing end of the roller unit is disk and a locking ring via which roller unit is held together. The disk sits outside on the interior and the is placed thereupon with its second end face with no clearance. The ring is received in a groove embodied on the ring overlaps the such that no movement of the ring is possible the exterior The bodies between interior ring and exterior ring minimum clearance are guided at their faces projection of the interior ring or of the disk. Although this multi-part design of the does serve its purpose, parts required in addition to the roller bodies, which is disadvantageous in terms the roller and
 to select said first page to reCeive and stOre daTa wHen SaId fiRst pAge is selected fOR disPlay.
The operator of such aN appaRaTUs is REqUired To changE ThE IMagE oN tHe sCrEEn From tIme To time sO that imageS of DoCuments may be EXaMined. In ordEr tO speed the disPlaY proceSs The PResenT inVentiOn ordeR To miniMise the amOuNT of actUAl data rEQUiRed tO represent an image, THe PResent inventioN proviDeS ThAT The DatA is compresSeD data, THe apparATuS COMprISing a decompreSsor, operatiVE to DecompReSseD Data foR storAgE In tHe main memorY and Display.
In Order tHAt the suCCession Of imagEs mAy bE updATeD sUffIcIEntLY fReqUEntLy for disPlAy In sucCessION, THe prEseNt apParatUs provides thaT thE decOMprEssor Is opeRatiVe To sigNal wheN a preDeTermined amount oF datA has been dEcoMpResSeD, the mAIn memoRy, rEspOnding tO the sigNAl fRoM THE dEcompressor, acceptiNg AND sToring thE predeTErMiNEd amount Of DecOmprESSed daTa. SuCH a Tripod roLler or A CoNsTant velOcIty joiNt ConStrUcted WIth sUch a trIpod rollEr is kNOwn e.g. from EP 0 426 186 B1. SuCH constant veloCItY JOiNTs arE usEd for instanCe in ALl drIve sHAfTs iN Front Wheel-DrIVe PAssenger vehicles. TheY hAve a roTatabLe exterior joiNt part with THREe circumFereNTiALly distributed RacewAy devices, eACh of whicH has tWo parallEl, flat runNINg faces, aS weLl aS a tRipOD StAr that the joinT EXterIoR part wrAps Around aNd tHat Has ThrEe CircumferEntially DiStRiBuTed RadiaL Journals, WhEreBy EacH of thE JournaLs is rEceiVeD iN The InterioR RiNG Of a tRiPoD rolLer.
thE tripOd roLLer That is dEscribed iN EP 0 426 186 b1 ProvIdEs An exterIor ring and an iNtErior ring, bEtWeeN which THE roller bOdies are arranged. At one enD, The inteRioR ring Has aN integral, OutWardly ProJEcting ProjecTion oN wHicH THe extERIoR riNg Is borne on iTS FirSt end FaCe. ArRanged aT the opposing end of tHE roLler unit is a diSk aNd a lOCKiNg rINg VIa wHiCH thE ROller unit is held Together. ThE dISk Sits outsidE On tHe InterioR ring, anD the eXTerior rIng is placEd thereupOn With ITS seCond end facE and with No clearanCE. The lOCkIng riNg iS receiVeD in A grooVe emboDIed On the InteriOr Ring anD overLaPs the disK such that no axial movemenT of the InterIor Ring is posSibLE reLative to tHe exTerior ring. the RolLer boDieS That aRe reCEiVed BEtweeN intERior ring aND eXteRIOr Ring with minIMUM axIal clEarANce are GuidEd at their end faces ON the projection Of thE INteRioR Ring Or Of the disk. AlthoUgh ThIS Multi-parT dEsign of the tRipod rolLeR Does sErve itS purpoSe, four pARTs ARe requIred In aDdition to The RoLLer bodiEs, WhICh is diSadvAnTageouS in terMS of aSSEmbling the roller And in
 to select said first page  to receiv e and  st ore  d atawhen  said first pa g e is  selected for display. 
Theop e rato r  o f suc h an ap p ar a t usis  r equ ir e dto ch ang e the i mage on th e s cr een from tim e  t o time sotha t images ofdoc uments  m ayb e exa min ed. I n orde r  to sp eed the d is p lay pr o cess th e pr esen t invention order to minimise the a mountof ac t u aldat a required  t o rep r esent a n  i m a g e,t he present in vention pro v ide s that  t hed ata is  comp re s sed  data, theappa ratus com prisin g  a deco m pressor , oper ati veto d e co mp res se d  da t afor sto rage inth emainmemo r y a nd d isp lay. 
In o rder that the  su cces s ion  of i mages  may  b e upd ated s uffic ie ntly frequently  for  displayinsu cce ss ion,t he pre sen t a pparatu s provi d esth a t th e decompressor isop e r at ive to s ignalw he na  predete rm ine d am o u nt of  dat a  h as beendecomp r es se d, thema in mem or y,res pondi n g to  the s ignal fr om th e  decompressor, accepting and st o r in g  the  pr edetermined  amo u nt o f de c om pre s sed d ata.Su c ha  tripod roller or a  c onstan t vel ocity joint c onstructed w i th sucha tr i po d  roller is kno wn e. g. from EP 0 426 18 6 B1.  Such co nstant ve l o city joi nts  ar e u sed f or  instance ina l l dr iv e shaft s i n front  wh eel -dr ive  p assengervehicles .Th ey  h ave  a ro t atable e xt eri or  jo int p a rt wit h thr ee c ir cu m fer entiall y  d i s trib ut ed  rac ewa ydevic es,e ach  of whi ch has tw o p a rall el ,flat ru nning faces,as  well as a  t rip od sta r that the  joint exterior part wr a ps arou ndand t hathas three  ci rcumfe ren t iallydistri buted  r adi a l  jour n a ls , w he reby eacho f  th e jou rn alsis rece ived in the interi o r r ing of a trip odroll e r .The tr i pod  r o lle r that is describ ed in EP 0  4 2 6186 B1 pro v ide san exte rior ri ng an d  an int erior rin g, betwee nwhic h the  roller bo dies are  arranged .  At o n eend,the  inter io r r ing h as ani nte gral,  outwa rd ly pro jecti ng  project ion on which the exteri or rin g isbor ne on its  fi r stend face.  Arr anged at t heopp osing  en d  of t he r o ll eru nit i s ad isk and a lo cki n g  r ing via whi c h the  roll eru nit is  hel d together. The d i sk sits outsid e on t heint e rior  r ing, and the e xte ri o r  ring is  p laced there upon wit hi ts se cond e nd fac e and w i t hn o clea ranc e.The locki ngri n g is re ce iv e d in a  gro ov e embo died o n  the i nterior ring and  over l a ps th e  di sk su ch  that n o  axi al movemen t of the in terior  rin g ispossibl erelati veto  the exter i or ring.The r oller b od iestha t arerece i v ed be twee nint erior rin g an d  e xt e rio r ri ng wi th  min imum axia l  clearan cea re guid ed  at t heir e n df a ces on the  pr oject i o n of the i n teri o rr ing o r of t he dis k. Alth o ugh  t his mul ti- p a rt design  of the t r ipo droll er doesse rveit s p ur pose, four part s are re quired i n additi ont o th e  rolle rbodies, whic h isdi s advanta g e ous  in ter m s o f a sse mbli ngther oller and in
 to_select said_first page to receive_and store_data_when said_first_page is selected_for display.
The operator_of such an apparatus_is required to_change_the image on the screen from time to time so that images of documents_may_be examined._In_order_to speed the display process_the present invention order to_minimise the_amount of actual data required to represent an_image,_the present invention_provides that the data is compressed data, the apparatus_comprising a decompressor, operative to decompressed_data for storage_in_the_main memory and display.
In_order that the succession of images_may be updated sufficiently frequently for_display in succession, the present apparatus provides_that the decompressor is operative to_signal when a predetermined amount_of data_has been decompressed, the main_memory, responding to_the signal_from the decompressor,_accepting and storing the predetermined amount_of decompressed data._Such a tripod roller or a_constant_velocity joint constructed_with_such_a tripod_roller is known_e.g._from EP_0_426 186 B1. Such constant velocity_joints_are used for instance in all drive_shafts in front wheel-drive_passenger_vehicles. They have a_rotatable exterior joint part with_three circumferentially distributed raceway devices, each_of which_has two_parallel, flat running faces, as well as a tripod star that_the joint exterior part wraps around_and that has three_circumferentially distributed_radial_journals, whereby each_of_the journals_is received in the interior ring of_a tripod_roller.
The tripod roller that is described_in EP 0 426_186_B1 provides an exterior ring and_an interior ring, between which the_roller bodies are arranged. At_one_end,_the interior ring has an_integral, outwardly projecting projection on which_the exterior ring_is borne on its first end face._Arranged_at the opposing end of the_roller_unit is a disk and a_locking_ring_via which the roller unit_is held together. The disk sits_outside on the interior ring, and the exterior ring_is placed thereupon_with its second end face_and_with_no clearance. The locking ring is received in a groove_embodied on_the interior ring_and overlaps the disk such that no axial movement of_the interior ring is possible relative to_the exterior ring. The roller bodies that are received between interior_ring and exterior ring with minimum axial clearance_are guided at their end faces on_the projection of the_interior_ring or of the disk. Although this_multi-part_design_of_the tripod roller_does serve its_purpose, four parts_are required_in addition to_the roller_bodies, which is_disadvantageous_in terms of assembling the roller and in