DK148372B

DK148372B - Drills

Info

Publication number: DK148372B
Application number: DK313178AA
Authority: DK
Inventors: Bernhard Steenken; Werner Willers
Original assignee: Amazonen Werke Dreyer H
Priority date: 1977-07-12
Filing date: 1978-07-12
Publication date: 1985-06-24
Also published as: DK313178A; NL7806548A; NL177882B; DE2731325A1; SE413973B; NL177882C; SE7807081L; DK148372C; DE2731325B2; DE2731325C3

Description

148372 t148372 t

Opfindelsen angår en såmaskine med en forrådsbeholder, der har et antal udstrømningsåbninger og en røremekanisme, over hvilken der findes en bejdsemiddelspreder, hvis lagerbeholder har flere afspærrelige udløbsåbninger, der i maskinens vandrette brugsstilling i det mindste tilnærmelsesvis flugter i lodrette planer med forrådsbeholderens udstranningsåbninger, og gennem udløbsåbningeme ragende, på en aksel anbragte,trukne udbringerorganer.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a seed drill with a storage container having a plurality of outflow openings and a stirring mechanism over which there is a pickling spreader whose storage container has several interlocking outlet openings which at least in the horizontal use position of the machine flow through and extend into the horizontal planes of the seed drill. the outlet openings projecting, on a shaft, drawn delivery means.

Fra beskrivelsen til DE-brugsmønster nr. 75 26 899 kendes en sådan såmaskine.From the description to DE-use pattern no. 75 26 899 such a drill is known.

Ved bejdsemiddelsprederen i denne såmaskine findes de fliglignende udformede og elastiske udbringerorganer inden i bejdsemiddelsprederens lagerbeholder, medens der udvendigt og foran dennes udløbsåbninger er 2 148372 anbragt skydere, ved hjælp af hvilke de enkelte udløbsåbninger kan lukkes.In the seed dressing spreader of this seed drill, the tab-like shaped and resilient dispensing means are located within the dressing spreader's storage container, while sliders are provided outside and in front of its outlet openings by means of which the individual outlet openings can be closed.

Fordelen ved disse såmaskiner består især i, at såmaterialet, som skal udbringes, før eller under udsåningen i forrådsbeholderen kan bejdses eller pudres mod skadedyr af enhver art, således at de hertil ellers nødvendige maskinelle indretninger og de særlige arbejdsprocesser kan udelades. Endvidere er det fordelagtigt, at der ved hjælp af de hver for sig afspærrelige udløbsåbninger i lagerbehoIderen kan undgås en stedvis overbejdsning af såmaterialet henholdsvis ansamling af en større mængde bejdse- og puddermiddel i forrådsbeholderen også i de tilfælde, hvor enkelte udstrømningsåbninger i forrådsbeholderen under hele arbejdet må holdes lukket af hensyn til indstilling af såmaskinen til større rækkebredder eller til frembringelse af køregader.In particular, the advantage of these seed drills is that the seed material to be applied before or during sowing in the storage container can be grazed or powdered against pests of all kinds, so that the otherwise necessary mechanical devices and the special working processes can be omitted. Furthermore, it is advantageous that by means of the individually lockable outlet openings in the storage container, a local overworking of the seed material or accumulation of a larger amount of pickling and powdering agent in the storage container can also be avoided even in cases where individual outflow openings in the entire storage container must be kept closed for the purpose of adjusting the seed drill to larger reach widths or to generate driving lanes.

Det er imidlertid en ulempe ved disse kendte såmaskiner, at bejdseeller puddermidlet som følge af de på såmaskinen under arbejdet indvirkende forskellige kørerystelser ikke altid udbringes i ensartet mængde fra bejdsemiddelsprederens udløbsåbninger. Endvidere er det en ulempe, at der efter lukning af enkelte udløbsåbninger med udbringerorganerne sker en løbende gennemrøring af bejdse- og puddermiddel i området ved disse åbninger, hvorved udbringerorganerne stryger hen over de i lukkestilling værende skydere og på disse steder river bejdse- og puddermidlet til et lag, som er vanskeligt at fjerne, og som lægger sig på skyderen og på de nærmeste indre dele af forråds-beholderen. Dette bevirker, at skyderne efter forholdsvis kort tids forløb ikke længere kan bevæges, og en omstændelig rengøring af optagebeholderen er nødvendig, når såmaskinen skal benyttes til udbringning af såmateriale, som kræver en anden rækkebredde, eller til arbejde,. hvor ingen eller andre afgangs- og dermed også udstrømningsåbninger skal lukkes.However, it is a disadvantage of these known sowing machines that the pickling or powdering agent, due to the different running shakes acting on the seedling during the work, is not always brought out in uniform quantity from the cutter spreader outlet openings. Furthermore, it is a disadvantage that after closing a few outlet openings with the dispensing means there is a continuous purging of pickling and powdering agent in the area at these openings, whereby the dispensing means flush over the sliders and in these places the pickling and powdering means tear to a layer which is difficult to remove and which lies on the slider and on the nearest inner portions of the storage container. This means that after a relatively short period of time the sliders can no longer be moved and a thorough cleaning of the receptacle is necessary when the seed drill is to be used for application of seed material which requires a different range width or for work. where no or any outlet and thus also outflow openings must be closed.

Formålet med opfindelsen er at forbedre bejdsemiddelsprederen i de således kendte såmaskiner, at der fås en ensartet og driftsikker udbringning af bejdse- og puddermiddel, også ved afspærring af enkelte udløbsåbninger.The object of the invention is to improve the pickling spreader in the sowing machines so known, that a uniform and reliable application of pickling and powdering agent is obtained, also by blocking individual outlet openings.

Dette er ifølge opfindelsen opnået ved, at udbringerorganerne befinder sig uden for lagerbeholderen i hver sit nedad åbne hus og er skiveagtigt udformede og ved deres ydre omkreds forsynet med knaster, og ?.t bredden af udbringerorganerne og deres knaster kun er 3 148372 så meget mindre end den indvendige afstand mellem sidevæggene i huset som det til en glidepasning svarende mål, og at der til afspærring af udløbsåbningerne fra huset findes aftageligt monterbare lukkekapper, som i monteret tilstand dækker de fra husene udragende dele af udbringerorganerne udvendigt.This is achieved by the invention in that the dispensing means are located outside the storage container in each downwardly open housing and are disc-shaped and at their outer circumference provided with cams, and the width of the dispensing means and their cams is only 3 148372 so much smaller. than the internal distance between the side walls of the housing as the target corresponding to a sliding fit, and that detachable mounting closures are provided for blocking the outlet openings from the housing, which in the mounted state cover the parts projecting from the housing externally.

Som følge af denne udformning bliver kun de af de enkelte knaster på udbringerorganerne grebne bejdse- og puddermiddelmængder tvangsstyret ført ud af bejdsemiddelsprederens lagerbeholder, uden at disse mængder på nogen måde kan blive påvirket af kørerystelser. Dersom nu enkelte udløbsåbninger skal afspærres, behøver man kun at fastgøre lukkekapperne på de tilsvarende huse. De i mellemrummene mellem knasterne værende mængder af bejdse- og puddermiddel bevæges herved omkring inden for husene og lukkekapperne, uden at de trænger ud i såmaskinens forrådsbeholder eller kan sætte sig fast på et sted i husene eller lukkekapperne. Ved genoptagelse af afgivelse ud gennem de afspærrede udløbsåbninger i lagerbeholderen skal husenes lukkekapper så atter blot fjernes, uden at det er nødvendigt at foretage en særlig rengøring af udløbsåbningerne.As a result of this design, only the quantities of pickling and powdering means seized by the individual knobs on the dispensing means are forced out of the pickling spreader's storage container, and these quantities cannot in any way be affected by driving shakes. If a few outlet openings are now to be blocked, you only need to fix the closure caps on the corresponding houses. The amounts of pickling and powdering agent in the spaces between the lugs are thereby moved around within the housings and closures without penetrating into the seed drill's storage container or being stuck in a place in the housings or closures. When resuming delivery through the blocked outlet openings in the storage container, the housing closures must then simply be removed without the need to special cleaning of the outlet openings.

En forbedring af løsnebevægelsen af de af knasterne medførte bejdse-og puddermiddelmængder opnås endvidere ved, at lukkekappernes sidevægge har samme indbyrdes afstand som husets sidevægge, og lukkekappernes indre omkredsflade slutter tæt til knasternes ydre omløbsbane. Hvis knasternes modsat omdrejningsretningen vendende side herved danner en stejlt nedfaldende anlægsflade, medens deres i omdrejningsretningen vendende overflade forløber fladt fra anlægsfladens radialt inderste kant til den radialt yderste kant af anlægsfladen på den næste knast regnet i omdrejningsretningen, så opstår der i lagerbeholderen ved de af lukkekapperne afspærrede udløbsåbninger en ekstra løsning af bejdseeller puddermidlet. Denne løsning fås ved, at en del af de af knasterne i en cirkelbane gennem huset og lukkekappen førte bejdse- og puddermiddelpartikler skubbes tilbage i lagerbeholderen, og andre partikler af midlet derfor gribes af knasten og medtages.Furthermore, an improvement in the loosening motion of the pickling and powdering means brought about by the lugs is achieved by the side walls of the closure caps being the same spacing as the sidewalls of the housing, and the inner circumferential surface of the closure caps close to the outer orbit of the lugs. If the side facing the direction of rotation of the bosses thereby forms a steeply falling abutment surface, while their surface facing in the direction of rotation extends flat from the radially inner edge of the abutment surface to the radially outer edge of the abutment surface of the next cam counted in the direction of rotation, the blocked outlet openings an additional solution of the pickling or powdering agent. This solution is obtained by pushing some of the pickling and powdering agent particles carried through a circular path through the housing and the closure sheath back into the storage container, and other particles of the agent are therefore grabbed by the cam and included.

I en foretrukken udførelsesform for opfindelsen er der på huset på den side, hvor knasterne udefra bevæger sig indad, anbragt en let aftagelig spærreskyder, der til begge sider rager ud over husets sidevægge og er fjederpåvirket i retning mod udbringerorganerne. Herved 4 148372 forhindres især ved de ikke med en lukkekappe forsynede huse, at frøkorn i såmaskinens forrådsbeholder gribes af udbringerorganernes knaster og føres ind i husene og dermed i lagerbehoIderen, hvorved der ved knastens indløbssted i huset ville kunne ske beskadigelse af frøkornene eller af huset ved sammenklemning af frøkorn. Når lukkekapperne skal fastgøres til afspærring af de enkelte udløbsåbninger på de tilhørende huse, skal man blot fjerne spærreskyderen fra disse huse, hvorefter der fås et uforstyrret omløb af de af knasterne grebne bejdse- og puddermiddelpartikler i husene og lukkekapperne. Når hver spærreskyder ved sin mod udbringerorganet vendende ende har et fremspring, og når der i hvert hus i afstand fra udbringerorganet findes en udsparing for fremspringet, så kan spærreskyderne, forblive i huset, idet de efter fastgørelsen af lukkekappen kun skal trækkes så langt tilbage, at deres fremspring kommer i indgreb i de tilhørende udsparinger.In a preferred embodiment of the invention, an easily removable latch slider is provided on the housing on the side where the lugs move inwardly, which project on both sides beyond the housing walls and are spring-loaded in the direction of the delivery means. Hereby, in particular, in the houses not provided with a sheath, it is prevented that seed grains in the seed hopper container are seized by the cuttings of the delivery means and introduced into the houses and thus in the storage container, whereby the seed grains or the house could be damaged by squeezing of seed grain. When the closure caps are to be fastened to block the individual outlet openings on the associated houses, simply remove the locking slider from these houses, and an undisturbed circulation of the pickling and powder particles gripped by the lugs in the housing and closure caps is obtained. When each locking slider has a projection at its end facing the delivery member, and when in each housing away from the delivery member there is a recess for the projection, then the locking sliders may remain in the housing, having only to be retracted so far after attaching the closing sheath. that their protrusions engage with the corresponding recesses.

Ifølge opfindelsen kan endvidere udbringerorganets aksel ved husene være omgivet af lejer, som ringformet strækker sig til begge sider ud forbi husets sidevægge, og lukkekapperne kan på deres sidevægge have opad åbne holdeorganer af elastisk materiale, hvis indvendige diameter svarer til lejets yderdiameter, og hvis omkreds er større end lejets halve omkreds. Ved denne udformning fås en ekstra fordelagtig mulighed for fastgørelse af lukkekapperne til husene, idet man hertil kun behøver at trykke lukkekapperne med deres holdeorganer ind over lejerne. Endelig kan ifølge opfindelsen opnås en særlig simpel ud-· formning af lukkekapperne og en virksom tætning af huset mod såmaskinens forrådsbeholder ved, at lukkekapperne i deres helhed består af elastisk plastmateriale og med deres øverste kant i påsat tilstand overalt strækker sig ud over husets nederste kant og med denne fremspringende del ligger tæt an mod huset.In addition, according to the invention, the shaft of the delivery member at the housings may be surrounded by bearings extending annularly on both sides beyond the sidewalls of the housing, and the closure caps may have on their side walls open holding members of elastic material whose internal diameter corresponds to the outer diameter of the bed and whose circumference is larger than the half of the rent. In this embodiment, an additional advantageous possibility of attaching the closure caps to the housings is obtained, since it is only necessary to push the closure caps with their holding means over the bearings. Finally, according to the invention, a particularly simple design of the closure caps and an effective sealing of the housing against the seed drill container can be obtained by the fact that the closure caps in their entirety consist of elastic plastic material and with their upper edge in the applied condition extending all over the lower edge of the housing. and with this protruding part is close to the housing.

Opfindelsen forklares nærmere i det følgende i forbindelse med tegningen, hvor fig. 1 viser forrådsbeholderen i en såmaskine ifølge opfindelsen i længdesnit, fig. 2 bejdsemiddelsprederen i den samme såmaskine i forstørret målestok og i snit efter linien A-B i fig. 1 og fig. 3 den samme bejdsemiddelspreder vist i snit efter linien C-D i fig. 2.The invention will be further explained in the following with reference to the drawing, in which fig. 1 is a longitudinal sectional view of the storage container of a seed drill according to the invention; FIG. 2 is an enlarged scale of the seed medium spreader in the same seed drill and in section along line A-B in FIG. 1 and FIG. 3 shows the same dressing spreader shown in section along line C-D in FIG. 2nd

5 148372 Såmaskinens forrådsbeholder 1 er forsynet med en røremekanisme 2 og en såaksel 3, som drives over røremekanismen 2, og et reguleringsgear 4, idet røremekanismen 2 på kendt og ikke vist måde står i kraftoverførende forbindelse med et af såmaskinens kørehjul. Neden under røremekanismen 2 har forrådsbeholderen 1 et antal udstrømningsåbninger 5, ud for hvilke der findes såhjul 6, der er anbragt på såakselen 3 med samme indbyrdes afstande som udstrømningsåbningerne 5, hvilke såhjul delvis er omgivet af såhuse 7. Når såmaskinen arbejder, tilføres det fra udstrømningsåbningerne 5 strømmende såmateriale ved hjælp af såhjulene 6 til såhusene 7, hvorfra de over til husene fastgjorte . såledningsrør 8 og hermed forbundne, ikke viste skær føres ned i jorden.The seed drill container 1 is provided with a stirring mechanism 2 and a seed shaft 3 driven over the stirrer mechanism 2 and a regulating gear 4, the stirring mechanism 2 being in a known and not shown way communicating with a driving wheel of the seed drill. Below the stirrer mechanism 2, the reservoir container 1 has a number of outflow openings 5, for which there are seed wheels 6, which are arranged on the seed shaft 3 with the same spacing as the outflow openings 5, which are partly surrounded by seed housings 7. When the seed drill operates, it is supplied from outflow apertures 5 flowing seed material by means of the seed wheels 6 to the seed housings 7, from which they attach to the housings. seed pipe 8 and associated inserts not shown are introduced into the soil.

En bejdsemiddelspreder 9 er anbragt i forrådsbeholderen oven over røremekanismen 2 og har en lagerbeholder 10, som er forsynet med udløbsåbninger 11, som i lodret plan flugter med forrådsbeholderens 1 udstrømningsåbninger 5. Endvidere er der uden for lagerbeholderen 10 anbragt udbringerorganer 12 på en aksel 13, hvilke udbringerorganer trækkes intermitterende over en med et friløb 14 med klembakker forsynet excentrikmekanisme 15, en i længderetningen gennem lagerbeholderen 12 forløbende røreaksel 16 og et gear 17.. Endvidere er . udbringerorganerne 12 hver delvis omgivet af et nedad åbent hus 18.A pickling spreader 9 is disposed in the storage container above the stirring mechanism 2 and has a storage container 10 provided with outlet openings 11 which align vertically with the outlet openings of the storage container 1 on the storage container 10, on the dispensing means 12 on the storage container 10. said delivery means being intermittently pulled over an eccentric mechanism 15 provided with a clearance 14, a longitudinal axis 16 extending through the storage container 12 and a gear 17. the dispensing means 12 are each partially surrounded by a downwardly open housing 18.

Til frembringelse af køregader for kørehjulene for en traktor, som trækker arbejdsredskaber, som på forskellige tidspunkter anvendes efter såningen, som f.eks. gødningsspredere eller marksprøjter, er den tredje udløbsåbning 5 fra venstre på tegningen lukket ved hjælp af en skyder 19, som befinder sig foran for denne udløbsåbning. Det er kun nødvendigt at lukke denne ene udløbsåbning 5, da dens afstand fra såmaskinens arbejdsbane svarer til den halve sporvidde af traktoren, og arbejdsbredden af det efterfølgende arbejdsredskab skal være dobbelt så stor som såmaskinens arbejdsbredde. Herved opstår ved frem-og tilbagekørsel af såmaskinen hver gang to køregader, hvis indbyrdes afstand nøjagtigt svarer til traktorens sporvidde. For nu at hindre, at bejdse- og puddermiddel skal nå ind i området ved den lukkede udløbsåbning 5 og hobe sig op dér, er den ovenover liggende udløbsåg-ning 11 i lagerbeholderen 10 lukket ved hjælp af en lukkekappe 20.For generating driving lanes for the driving wheels of a tractor that pulls working tools used at different times after sowing, such as fertilizer spreaders or field sprayers, the third outlet opening 5 from the left of the drawing is closed by means of a slider 19 which is in front of this outlet opening. It is only necessary to close this one outlet opening 5, as its distance from the drill's working path corresponds to half the track width of the tractor and the working width of the subsequent working tool must be twice the working width of the drill. This results in the return and return of the seed drill every time two driving streets whose spacing exactly corresponds to the tractor's track width. To now prevent pickling and powdering agent from entering the area at the closed outlet opening 5 and accumulating there, the overhead outlet saw 11 in the storage container 10 is closed by means of a closure cap 20.

6 1483726 148372

Som det tydeligt ses af fig. 2 og 3, er udbringerorganerne 12 skivelignende og er hver ved deres ydre omkreds forsynet med fire knaster 21, som under omløbet i den med en pil 22 viste omdrejningsretning strækker sig ind i den pågældende udløbsåbning 11 i lagerbeholderen 10. Bredden b af udbringerorganerne 12 og af knasterne 21 er kun så meget mindre end den indvendige afstand a mellem sidevæggene 23 i det delvis omsluttende hus, at delene kan bevæge sig med glidepasning. Endvidere har knasterne 21 på deres mod omdrejningsretningen 22 vendende side· hver - en stejlt nedfaldende anlægsflade 24, medens deres i omdrejningsretningen 22 vendende overflade 25 forløber fra den radialt inderste kant 26 af anlægsfladen 24 til den radialt yderste kant 27 på den regnet i omdrejningsretningen 22 næstfølgende knast 21.As can be clearly seen in FIG. 2 and 3, the dispensing means 12 are disc-like and each at their outer circumference is provided with four knobs 21 which extend during the rotation in the direction of rotation indicated by an arrow 22 into the respective outlet opening 11 in the storage container 10. The width b of the dispensing means 12 and of the lugs 21 is only so much smaller than the internal distance a between the side walls 23 of the partially enclosing housing that the parts can move with sliding fit. Furthermore, the lugs 21 on their side facing the direction of rotation 22 each have a steeply descending abutment surface 24, while their surface 25 facing in the direction of rotation 22 extends from the radially inner edge 26 of the abutment surface 24 to the radially outer edge 27 on the one calculated in the direction of rotation 22. next cam 21.

Udbringerorganernes 12 aksel 13 er ved husene 18 omgivet af lejer 28, som strækker sig ringformet ud fra husets 18 sidevægge 23 til begge sider. På disse lejer 28 er lukkekappen 20 påtrykket ved hjælp af to opad åbne holdeorganer 29, hvis indvendige diameter svarer til den udvendige diameter af lejet 28, og hvis omkreds er større end lejets halve omkreds. Lukkekappen 20 med holdeorganerne 29 er fremstillet ud i ét stykke af elastisk plastmateriale. Endvidere strækker lukkekappen 20 sig med en øvre kant 30 til alle sider ud forbi husets 18 ne-derste kant 31 og ligger med denne fremspringende del 32 tæt mod huset 18. Endvidere har lukkekantens 20 sidevægge 23 samme indbyrdes afstand a som sidevæggene 23 i huset 18, medens deres indre omkredsflade 34 slutter tæt til knasternes 21 ydre omløbsbane 35.The shaft 13 of the delivery members 12 is surrounded by the bearings 28 by the bearings 28 which extend annularly from the side walls 23 of the housing 18 on both sides. On these bearings 28, the closure cap 20 is applied by means of two upwardly open holding means 29, the inside diameter of which corresponds to the outside diameter of the bearing 28 and the circumference of which is greater than the half perimeter of the bed. The closure cap 20 with the holding means 29 is made of one piece of resilient plastic material. Furthermore, the closure cap 20 extends with an upper edge 30 on all sides beyond the lower edge 31 of the housing 18 and lies with this projecting portion 32 close to the housing 18. Furthermore, the side walls 23 of the closing edge 20 have the same spacing a as the side walls 23 in the housing 18. while their inner circumferential surface 34 terminates close to the outer orbit 35 of the lugs 21.

På den side, hvor knasterne 21 udefra bevæger sig ind i huset 18, er der på hvert hus anbragt en spærreskyder 36, som strækker sig over mellemrummet a mellem sidevæggene 23 i huset 18 og ud til begge sider. Ved hver spærreskyder 36 er en fjeder 37 fastgjort ved sin ene ende, medens dens anden ende er stukket ind i huset 18, således at den udøver en kraft på spærreskyderen 36 i retning mod det tilhørende udbringerorgan 12. Ved den ende af hver spærreskyder 36, som vender mod udbringerorganet 12, findes endvidere et fremspring, og i hvert hus 18 i afstand c fra udbringerorganet 12 findes en'udsparing 39, som kan optage fremspringet 38.On the side where the lugs 21 move into the housing 18 from the outside, a locking slider 36 is provided on each housing which extends over the space a between the side walls 23 of the housing 18 and out to both sides. At each locking slider 36, a spring 37 is secured at one end thereof, while its other end is inserted into the housing 18 so that it exerts a force on the locking slider 36 in the direction of the associated delivery member 12. At that end of each locking slider 36, further facing the ejector 12, there is also a projection, and in each housing 18 at distance c from the ejector 12 there is a recess 39 capable of receiving the projection 38.

Som det tydeligt ses af fig. 2, er fremspringet 38 på spærreskyderen 36, når lukkekappen 20 er påsat, ført ind i udsparingen 39, hvori denAs can be clearly seen in FIG. 2, the projection 38 of the latch slide 36, when the closure cap 20 is applied, is inserted into the recess 39 wherein

Claims

148372 is retained by the spring 37. In this locked state of the latch slider 36, the amount of pickle or powder average gripped by the lugs 21 can be undisturbedly moved through the closure cap 20 and housing 18. Patent claims.

1. Seed drill with a storage container provided with a plurality of outflow openings and a stirring mechanism over which there is a pickling spreader, the storage container of which has several in the horizontal use position of the machine with the outlet container's outlet openings at least approximating in vertical flushing openings. and through these projecting means, arranged on a shaft and drawn delivery means, characterized in that the delivery means (12) are located outside the storage container (10) in each downwardly open housing (18), are disc-shaped and are provided with cams at their outer circumference. (21) and that the width (b) of the delivery means (12) and their lugs (21) is less than the internal distance (a) between the side walls (23) of the housing (18) corresponding to a sliding fit, and wherein there are closure caps (20) which can be detachably mounted on the housings (18) and which, when fitted, cover them from the housings (18) for blocking the outlet openings (11) projecting portions of the projecting means (12) externally.

Seed drill according to claim 1, characterized in that the side walls (33) of the closure sheath (20) have the same spacing (a) as the side walls (23) of the housing (18) and that the inner circumferential surface (34) of the closure sheath is close to the one. outer orbit (35) for the lugs (21).

Seed drill according to claims 1 and 2, characterized in that the lugs (21) on their side facing away from the direction of rotation (22) each have a steeply falling abutment surface (24) while their surface (25) facing in the direction of rotation (22) extends. flat from the radially inner edge (26) of the abutment surface (24) to the radially outer edge (27) of the abutment surface ('24) on the cam (21) following in the direction of rotation (22).

Seed drill according to claims 1-3, characterized in that in each housing (18) on the side where the lugs (21) move from the outside and