FI90472C

FI90472C - Linear drive

Info

Publication number: FI90472C
Application number: FI911433A
Authority: FI
Inventors: Pertti Sormunen
Original assignee: Orion Yhtymae Oy
Priority date: 1991-03-25
Filing date: 1991-03-25
Publication date: 1994-02-10
Also published as: FI911433A; FI911433A0; FI90472B

Description

1 904721 90472

Lineaarinen vetolaite - Linear utdragsanordning Tåmån keksinnQn kohteena on vetolaite, joka on tarkoitettu 5 varsinkin kasetista ulosvedettåvån liukulevyn liikutteluun levylla olevan inforxnaation luentaa vårten ja joka muodostuu pituusakselinsa ympSri kierrettMvMsta akselitangosta seka sillå nousukulmaan asetettujen vetolaakereiden avulla line-aarisesti liikkuvasta vetomutterista, johon liukulevy tins.The present invention relates to a traction device for moving a sliding plate, in particular to be pulled out of a cassette.

10 vedettava kappale on jårjestetty kiinnittymaån.10 The towed part is arranged in the attachment ground.

Ulosvedettåvan liukulevyn sisåltåviå RIM-kasetteja kåytetaSn mm. rontgenkuvauksessa, jossa kuvattavan kohteen låpi joh-dettu, kohteessa tapahtuvan absorption modifioima rdntgenså-15 teily kohdistetaan liukulevyllå olevaan virittyvaan loiste-ainekerrokseen, johon sateilyn sisaltama informaatio tallen- tuu. Tåmån valotusvaiheen jålkeen kasetissa oleva levy luetaan erillisellå luentalaitteella, joka lasersåteen avulla purkaa informaation kuvaksi, joka nåytetåån tietoko-20 neen kuvaruudulla tai tulostetaan filmille.RIM cartridges containing a pull-out sliding plate are used for e.g. in X-ray imaging, in which the X-ray-15 radiation modified by the absorption in the object is passed through the object to be imaged, it is applied to a tunable phosphor layer on a sliding plate, in which the information contained in the rain is stored. After this exposure step, the disc in the cassette is read by a separate reading device which, by means of a laser beam, decompresses the information into an image which is displayed on a computer screen or printed on film.

RIM-kasetin liukulevyn luenta tapahtuu kåytånndssa vetamållå levy ulos kasetista lukuasemaan, jossa levylla oleva informaatio luetaan levyn ollessa mahdollisimman tasaisessa 25 lineaariliikkeesså. Luennan jSlkeen levy siirretåån tyhjen-nysasemaan, jossa se tyhjennetåån informaatiosta voimakkaan valon avulla, ja lopuksi palautetaan takaisin kasettiin odottamaan seuraavaa kåyttokertaa. Aikaisemmin liukulevy siirrettiin kasetista erilliselle hihnakuljettimelle infor-30 maation luentaa ja tyhjennystå vårten, mutta FI-patenttiha-kemuksessa 903796 on esitetty tuoreempi ratkaisu, jossa kåytetåån liukulevya liikuttavaa vetolaitetta, jossa levyyn tarttuva, vastakkaisiin suuntiin kierrettåvållå akselilla lineaarisesti liikkuva vetomutteri (kelkka) vetaå levyn 35 ulos kasetista ja palauttaa sen sinne takaisin informaation luennan ja tyhjennyksen tapahtuessa levyn edestakaisen liikkeen aikana.The RIM cassette's sliding plate is read in practice by pulling the plate out of the cassette to a read position where the information on the plate is read with as smooth a linear motion as possible. After the reading, the disc is moved to a erase station, where it is erased from the information by strong light, and finally returned to the cassette to wait for the next use. Previously, the sliding plate was transferred from the cassette to a separate belt conveyor for reading and emptying information, but FI patent application 903796 discloses a more recent solution using a sliding plate moving traction device with out of the cassette and returns it there when the information is read and erased during the reciprocating movement of the disc.

2 904722 90472

Fl-hakemuksessa 903796 on vetomutterin lineaariliike kierto-liikkeeseen saatettavalla akselilla aikaansaatu akselia vas-ten nousukulmaan asetetuilla vetolaakereilla sekå erillisel-lå ohjaimella, joka eståå mutterin kiertymisen akselin muka-5 na. Vetolaakerit ovat kuulalaakereita, joita on yhteenså 6 kpl jårjestettyinå kahdeksi kolmen rinnakkaisen laakerin muodostamaksi ryhmåksi akselin ympårille. Nåmå akselin pi-tuussuunnassa peråkkåiset laakeriryhmåt tukevat mutterin akselia siten, ettå mutteri pysyy suorassa edestakaisen liik-10 keenså aikana. Ratkaisussa on kuitenkin haittana se, ettå vetolaakereista vuotaa niiden asennon ja niiden ulkokehåån kohdistuvan voiman johdosta oljyå, joka joutuu vetoakselil-le, minkå seurauksena vetoakseli keråå pinnalleen likaa ym-påristostå. Ongelmaa lisåå se, ettå vetoakselin påån tuen-15 taan on kåytetty monikerroslaakereita, joista irtoaa kåytos-så runsaasti teflonmuruja, jotka niinikåån pååtyvåt vetoakselin 01jyyntyneelle pinnalle. Kun vetolaakerit edelleen puristavat akselin pintaan tarttuneen lian ja murut entistå tiukemmin kiinni akseliin, alkaa vetomutterin lineaariliik-20 keen tasaisuus kårsiå ja sen seurauksena RIM-levyltå luetta-van kuvan laatu heikkenee.In F1 application 903796, the linear movement of the traction nut on the shaft to be rotated is provided by traction bearings placed at an angle of inclination against the shaft and by a separate guide which prevents the nut from rotating along the shaft. Thrust bearings are ball bearings, of which there are a total of 6 arranged in two groups of three parallel bearings around the shaft. In this longitudinal direction of the shaft, successive bearing groups support the shaft of the nut so that the nut remains straight during its reciprocating movement. However, the disadvantage of the solution is that, due to their position and the force on their outer circumference, oil leaks from the drive bearings, which come into contact with the drive shaft, as a result of which the drive shaft collects dirt from the environment. Adding to the problem is the use of multilayer bearings for the drive shaft end support-15, from which a large amount of Teflon crumbs are released during use, which also end up on the submerged surface of the drive shaft. As the traction bearings continue to compress the dirt and crumbs adhering to the shaft surface even more tightly on the shaft, the linearity of the linear movement of the traction nut begins to suffer and the quality of the image read from the RIM disc deteriorates.

Tåmån keksinnon tarkoituksena on parantaa vetolaitetta si-ten, ettå edellå mainittu likaantumisongelma ja siitå seu-25 raavat epåkohdat våltetåån. Keksinnon mukaiselle vetolait-; teelle on tunnusomaista se, ettå vetomutteri kåsittåå kolme : vetolaakeria, jotka on jårjestetty oleellisesti rinnakkain akselitangon ympårille, ja ettå vetomutteri on mainittujen vetolaakereiden lisåksi varustettu akselitankoa ympåroivållå ' 30 rengasmaisella, puhdistavalla liukulaakerilla, joka on oljyå sisåltåvåå huokoista materiaalia, jolloin vetolaakerit ja liukulaakeri yhdesså muodostavat liikkuvan vetomutterin tuennan akselitangolle.The object of the present invention is to improve the traction device so that the above-mentioned contamination problem and the consequent drawbacks are avoided. The traction device according to the invention; is characterized in that the drawbar nut comprises three: drawbar bearings arranged substantially parallel around the shaft rod, and that the drawbar nut is provided with, in addition to said drawbar bearings, for the axle rod support of the movable drawbar nut.

35 Keksinnon perusajatuksen mukaan huokoinen, oljyå sisåltåvå liukulaakeri muodostaa harjan tapaan toimivan puhdistimen, joka vetomutterin osana liikkuessaan tyontåå akselitangolle joutuneen lian tangon påihin. Nåin akselitanko pysyy kåytås- 3 90472 så puhtaana, mikå takaa vetomutterin tasaisen liikkeen ja RIM-kasetilta saatavien kuvien laadun såilymisen moitteetto-mana.35 According to the basic idea of the invention, the porous, oil-containing plain bearing forms a brush-like cleaner which, as part of the traction nut, pushes the dirt on the shaft rod into the ends of the rod. This keeps the shaft rod clean during use, ensuring smooth movement of the drawbar nut and maintaining the quality of the images from the RIM cartridge.

5 Vetomutteriin kuuluva liukulaakeri on edullisesti oljyå si-såltåvåå sintrattua metallia, kuten esim. oljypronssia. 01-jypronssilaakerit ovat huokeaa, helposti saatavilla olevaa kauppatavaraa, ja niiden on havaittu soveltuvan keksinnon mukaiseen kåyttoon erinomaisesti.The plain bearing of the traction nut is preferably an oil-containing sintered metal, such as oil bronze. 01-milled bronze bearings are an inexpensive, readily available commodity and have been found to be excellently suited for use in the present invention.

1010

Vetomutteriin keksinnSn mukaisesti sisållytetty liukulaakeri ei ainoastaan toimi akselitangon puhdistimena, vaan myos osaltaan tukee mutteria akselitankoa vasten. Tåten liukulaakeri korvaa osan aikaisemmista vetomutterin nousukulmaan 15 asennetuista vetolaakereista, millå saavutetaan entistå hal-vempi konstruktio. FI-hakemuksen 903796 mukaiseen ratkaisuun verrattuna on kuudesta nousukulmaan asennetusta vetolaake-rista keksinnosså kolme korvattu yhdellå niitå oleellisesti halvemmalla rengasmaisella liukulaakerilla, kuten oljyprons-20 silaakerilla.The plain bearing incorporated in the traction nut according to the invention not only acts as a shaft rod cleaner, but also contributes to supporting the nut against the shaft rod. The plain bearing thus replaces some of the previous traction bearings mounted on the pitch angle 15 of the drawbar nut, thus achieving an even cheaper construction. Compared to the solution according to FI application 903796, in the invention three of the six thrust bearings mounted at an angle of inclination have been replaced by one of them with a substantially cheaper annular plain bearing, such as an oil-bronze-20 plain bearing.

Keksinnon mukaan on my6s akselitangon påån tuentana edullis-ta kåyttåå 61jyå sisåltåvåå huokoista materiaalia, kuten 61-jypronssia olevaa liukulaakeria. 6ljypronssilaakeri on tåhån .. * 25 saakka kåytettyjå monikerroslaakereita halvempi, eikå siitå • ; irtoa akselitankoa likaavia teflonhiukkasia tms. epåpuhtauk- sia.According to the invention, it is also advantageous to use a porous material containing 61 gauge, such as a 61 gauge plain bearing, to support the end of the shaft rod. 6Oil bronze bearings are still cheaper today. * Up to 25 multi-layer bearings used, not •; loose Teflon particles or other contaminants contaminating the shaft rod.

Keksinn6n mukaista vetolaitetta, jonka vetomutteri kåsitti - - 30 liukulaakerina 61jypronssilaakerin sekå vetolaakereina kolme rinnakkaista kuulalaakeria ja jossa akselitangon påån tukena kåytettiin niin ikåån 61jypronssilaakeria, on testattu ko-keella, jossa vetomutteri suoritti akselitangolla 80 000 edestakaista liikettå. Koko testin ajan laite toimi erittåin 35 hyvin. Hiukkasten irtoamista laakereista ei havaittu, veto-laakereiden rasvavuodosta ei aiheutunut ongelmia ja vetomutterin lineaariliike såilyi koko ajan erittåin tasaisena.The traction device according to the invention, which was provided with a traction nut - - 30 as a plain bearing 61jons and three parallel ball bearings as traction bearings and in which a 61jon bronze bearing was also used as a support for the shaft rod end, has been tested with a traction nut 80. Throughout the test, the device performed very well. No particle detachment was observed from the bearings, no problems were caused by grease leakage from the traction bearings, and the linear motion of the traction nut remained very smooth at all times.

4 904724 90472

Keksinn6n mukaisen vetolaitteen ensisijaisena kåyttåtarkoi-tuksena on liukulevyn vetåminen vetomutterin avulla ulos kasetista luentaa vårten ja levyn palauttaminen luennan jål-keen takaisin kasettiin. Kysymyksesså voi olla esim. r6nt-5 genkuvauksessa kåytettåvå RlM-kasetti, jonka liukulevy lue-taan lasersåteen avulla ja tyhjennetåån sen jålkeen infor-maatiosta voimakkaalla valolla vetolaitteella aikaansaatavan levyn edestakaisen liikkeen aikana. Kuitenkin keksinto on sovellettavissa myos muihin suurta tarkkuutta vaativiin 10 kåyttotarkoituksiin, joissa akselin kiertoliike on saatava muunnetuksi mahdollisimman tasaiseksi lineaariliikkeeksi.The primary purpose of the traction device according to the invention is to pull the sliding plate out of the cassette by means of a traction nut to read the arms and to return the plate to the cassette after the reading. This may be, for example, an R1M cassette used in r6nt-5 gene imaging, the sliding plate of which is read by means of a laser beam and then emptied of information by strong light during the reciprocating movement of the plate produced by the traction device. However, the invention is also applicable to other high-precision applications in which the rotational movement of the shaft must be converted into the smoothest possible linear movement.

Keksintoå selostetaan seuraavassa yksityiskohtaisemmin esi-merkin avulla viittaamalla oheisiin piirustuksiin, joissa 15 kuvio 1 esittåå eråstå keksinnon mukaista vetolaitetta jår-jestettynå liikuttamaan RIM-kasetin valotettua liukulevyå levyn luennan ja sen jålkeisen tyhjennyksen aikana, kuvio 2 esittåå kuvion 1 mukaiseen laitteeseen kuuluvaa, akselitangolla liikkuvaa vetomutteria sekå mutterin ohjainta 20 tangon suunnasta nåhtynå, ja kuvio 3 esittåå kuvion 2 mukaista vetomutteria ja ohjainta pååltå nåhtynå.The invention will now be described in more detail, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a traction device according to the invention as well as the nut guide 20 as seen from the direction of the rod, and Fig. 3 shows the pull nut and guide according to Fig. 2 as seen from above.

Kuviossa 1 on keksinnån mukainen vetolaite 1 esitetty osana 25 laitekokonaisuutta, joka suorittaa rontgenkuvauksissa kåyte-tyn RIM-kasetin 2 valotetun liukulevyn 3 ulosvedon kasetista, ulosvedon aikana tapahtuvan liukulevyllå olevan infor-maation luennan lukuasemassa 4, liukulevyn palauttamisen takaisin kasettiin sekå paluuliikkeen aikana tapahtuvan le-30 vyn tyhjentåmisen informaatiosta tyhjennysasemassa 5. Maini-tut toiminnot tapahtuvat laitteiston kotelomaisen rungon 6 ympåroimåsså valolta suojatussa tilassa 7, johon vetolaite 1 on sijoitettu.Fig. 1 shows the traction device 1 according to the invention as part of a device assembly which performs the extraction of the exposed sliding plate 3 of the RIM cassette 2 used in X-ray imaging from the cassette; 30 of the emptying information in the emptying station 5. Said functions take place in a light-protected space 7 surrounded by the housing-like body 6 of the apparatus, in which the traction device 1 is placed.

35 Vetolaite l kåsittåå pååosinaan pituusakselinsa ympåri kierrettåvån akselitangon 8, joka on muodoltaan sileå-pintainen ympyrålieri0, akselitankoa keskenåån vastak- 5 90472 kaisiin suuntiin kiertåvån askelmoottorin 9 sekå akselitan-golla lineaarisesti keskenåån vastakkaisiin suuntiin liikku-van vetomutterin 10. Askelmoottori 9 ja akselitangon 8 påå 11 ovat tuettuina runkoon 6, tangon paa sita ymparoivån 5 rengasmaisen 61jypronssilaakerin 12 vålityksellå. Vetomutte-ri 10 on varustettu kasetista 2 ulosvedettåvån liukulevyn 3 reunaan tarttuvin magneetein 13, joiden varassa vetomutterin suorittama liukulevyn ulosveto ja palautus takaisin kasettiin tapahtuvat.35 The traction device 1 comprises, for the most part, a shaft rod 8 rotating about its longitudinal axis 8, which has a smooth-surface circular cylindrical shape, a shaft rod 8 opposite the axis 8 and a shaft motor rotating in a direction opposite to the axis 9 and the shaft axis. 11 are supported on the body 6 by the annular 61-bronze bearing 12 surrounding the rod 5 around it. The pull nut 10 is provided with magnets 13 which engage the edge of the sliding plate 3 to be pulled out of the cassette 2. on which the sliding plate is pulled out and returned to the cassette by the pull nut.

1010

Liukulevyn 3 ulosvetovaiheessa tapahtuvaa levyllå olevan informaation luentaa vårten on lukuaseman 4 ylåpuolelle sijoitettu peili 14, joka ohjaa nakyvan valon aallonpituus-alueella olevaa lasersådettå 15 edestakaisin tasaisessa 15 liikkeesså olevan levypinnan poikki. Levypinnasta emittoitu-va valo johdetaan valojohdetta 16 myoten valomonistinputkel-le (ei esitetty). Liukulevyn 3 tyhjennys informaatiosta tapahtuu levyn paluuliikkeen aikana tyhjennysasemassa 5, jossa levyn pintaan johdetaan valonjohteella 17 voimakas 20 tyhjennysvalo.In order to read the information on the plate in the extraction phase of the sliding plate 3, a mirror 14 is placed above the reading station 4, which guides the laser beam 15 in the wavelength range of the visible light back and forth across the plate surface in smooth motion. The light emitted from the plate surface is passed through a light guide 16 to a photomultiplier tube (not shown). The emptying of the sliding plate 3 from the information takes place during the return movement of the plate in the emptying station 5, where a strong 20 emptying light is applied to the surface of the plate by a light guide 17.

Akselitangolla 8 liikkuvan, liukulevya 3 edestakaisin lii-kuttavan vetomutterin 10 rakenne selviåå låhemmin kuvioista 2 ja 3. Mutteri 10 on varustettu kolmella akselitankoa 8 25 vasten asetetulla, nousukulmaan kallistetulla kuulalaakeril-la 18, jotka on jårjestetty rinnakkain akselitangon ymparil-le. Akselitangon 8 kiertyminen pituusakselinsa ympåri saat-taa kuulalaakerit 18 kiertoliikkeeseen ja kun laakereiden akseleiden 19 suunta poikkeaa hieman akselitangon suunnasta, 30 on tuloksena se, etta laakerit pakottavat vetomutterin tankoa myoten tapahtuvaan lineaariseen liikkeeseen, joka vastaa analogisesti tavanomaisen mutterin liikettS ruuvi-kierteella.The structure of the traction nut 10 moving on the shaft rod 8 and moving the sliding plate 3 back and forth will be explained in more detail in Figures 2 and 3. The nut 10 is provided with three ball bearings 18 inclined at an angle of inclination against the shaft rod 8 and arranged parallel to the shaft rod. Rotation of the shaft rod 8 about its longitudinal axis causes the ball bearings 18 to rotate, and when the direction of the bearing shafts 19 deviates slightly from the direction of the shaft rod, 30 the bearings force the drawbar

35 Vetolaakereina toimivien kuulalaakereiden 18 lisSksi veto-mutteri 10 kåsittaa akselitankoa 8 ymparoivån rengasmaisen liukulaakerin 20, jonka muodostaa 61jypronssilaakeri. Oljy-pronssilaakeri 20, joka on sintrattua pronssia, jonka huoko- 6 90472 sissa on roineraalioljyå, toisaalta yhdesså kuulalaakereiden 18 kanssa tukee vetomutteria 10 akselitankoa 8 vasten mutte-rin lineaarisen liikkeen aikana ja toisaalta toimii akselitankoa harjan tapaan puhdistavana elimenå, joka estaa lian 5 keraantymisen tangon pinnalle ja varmistaa taten vetomutte-rin 10 lineaariliikkeen tasaisuuden jatkuvassa kaytdssS.In addition to the ball bearings 18 acting as traction bearings 18, the traction nut 10 comprises an annular plain bearing 20 surrounding the shaft rod 8, which is formed by a bronze bearing 61. The oil-bronze bearing 20, which is a sintered bronze with a porous oil of roin mineral oil, on the one hand together with the ball bearings 18 supports the traction nut 10 against the shaft rod 8 during linear movement of the nut and on the other hand acts as a brush on the surface of the rod and ensures the uniformity of the linear movement of the tension nut 10 in continuous use.

Vetomutteriin 10 on kuvioiden 2 ja 3 mukaisesti edelleen liitetty ohjain 21, joka muodostuu mutteriin kiinnitetysta 10 korvakkeesta 22, korvakkeeseen joustavalla nivelella 23 liitetysta, teflonruuvein 24 varustetusta haarukkaosasta 25 seka stationaarisesta johdetangosta 26. Ohjaimen 21 tarkoituksena on pakottaa vetomutteri 10 liikkumaan halutul-la tavalla lineaarisesti akselitankoa 8 mydten estamSlla 15 vetomutteria pyorimåstå tangon mukana. Vetomutterin 10 lineaariliikkeen tasaisuuteen ei ohjaimella 21 ole kaytån-n5ssa vaikutusta.As shown in Figures 2 and 3, a guide 21 is further connected to the tension nut 10, consisting of a lug 22 attached to the nut, a fork portion 25 with Teflon screws 24 and a stationary guide rod 26 connected to the lug by a flexible joint 23, and the guide 21 is intended to force the tension nut 10 to move shaft rod 8 mytten blocking 15 pull nuts from the wheel with the rod. The uniformity of the linear movement of the traction nut 10 is not affected by the guide 21 in use.

Alan ammattimiehelle on selvSS, ettå keksinndn erilaiset 20 sovellutusmuodot eivat rajoitu esitettyyn esimerkkiin, vaan voivat vaihdella oheisten patenttivaatimusten puitteissa.It will be apparent to those skilled in the art that the various embodiments of the invention are not limited to the example shown, but may vary within the scope of the appended claims.

Claims

A pulling device (1), which is specifically intended for moving a sliding plate (3) which can be pulled out from a cassette (2) for locking information contained in the plate and consisting of a rotary shaft rod (8). and a tensile bearing (18) arranged on the same means by means of a riser angle (18), a linear riveting tensioning nut (10), to which the sliding plate or such a drawable target has been arranged to attach, characterized in that the drawing nut (10) comprises three tensile bearings (18). , which are arranged around the shaft bar (8) substantially next to each other, and that besides said tension bearing, the tug nut is provided with a shaft rod surrounding annular cleaning sliding layer (20) consisting of a porous, oil-containing material, the tension bearings and the sliding bearing together. functions that accounted for the moving nut on the shaft bar.

Tensile device according to claim 1, characterized in that the slide bearing (20) consists of a sintered oil-containing metal.

3. A tensioning device according to claim 2, characterized in that the sliding bearing (20) is an oil bronze bearing.

4. Towing device according to one of the preceding claims, characterized in that the bearing bearings (18) are ball bearings. 9 90472

Tensile device according to any one of the preceding claims, characterized in that the spirit (11) of the shaft rod (8) is supported on a sliding bearing (12) consisting of a porous oil-containing material, such as oil bronze. 5

6. A tensioning device according to any of the preceding claims, characterized in that the tensioning nut (10) is arranged to move back and forth to pull the sliding plate (3) out of the cassette (2) and return it to the cassette after the plate has been locked.

Tensile device according to claim 6, characterized in that the tug bearings (18) pass during the pull-out of the sliding plate (3) before the sliding bearing (20) and during the return movement of the sliding plate after the same.

Tensile device according to one of the preceding claims, characterized in that the device (1) is arranged to stir an exposed sliding plate (3) of a RIM cassette during locking of the plate by laser beams and during subsequent emptying of the plate.