DK150652B

DK150652B - SEAM MACHINE INTENDED TO CONNECT WITH A TRACTOR

Info

Publication number: DK150652B
Application number: DK75079A
Authority: DK
Inventors: Franz Grosse-Scharmann
Original assignee: Amazonen Werke Dreyer H
Priority date: 1978-02-22
Filing date: 1979-02-21
Publication date: 1987-05-18
Also published as: GB2017472B; NL183623C; DE2807521B2; DK75079A; FR2417927A1; NL183623B; DK150652C; AT361240B; NL7901187A; GB2017472A; DE2807521A1; DE2807521C3; BE874342A; FR2417927B1; ATA140279A

Description

i 150652in 150652

Opfindelsen angår en med en traktor sammenkoblelig såmaskine, som har en forrådsbeholder med et antal udløbsåbninger, gennem hvilke såmaterialet i forrådsbeholderen over en doseringsmekanisme med en med regulerbart omdrejningstal trukket så-5 aksel og derpå anbragte så hjul nedfældes i jorden gennem til doseringsmekanismen sluttede rørledninger, idet materialetilførslen alene er bestemt af transporthjulenes omdrejningstal, og hvor de rørledninger, der er indrettet til at ligge ud for'de af traktorhjulene frembragte spor, ved hjælp 10 af en skiftemekanisme kan ind- og udkobles i periodisk tilbagevendende rækkefølge til frembringelse af såkaldte køre-gader for efterfølgende landbrugsredskaber.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seed drill interconnecting machine having a supply container having a plurality of outlet openings through which the seed material in the supply container is pulled over a dosing shaft with an adjustable speed and then wheels are inserted into the dosing tube through the dosing tube. the material supply being determined solely by the rpm of the transport wheels, and where the pipelines arranged to lie ahead of the tracks of the tractor wheels can be switched on and off in periodic recurring order to produce so-called driving wheels. streets for subsequent farm implements.

Fra DE fremlæggelsesskrift 26 09 323 kendes en såmaskine af den foran beskrevne art.Ved denne såmaskine er den periodisk tilbagevendende ud-15 og indkobling af materialetilførslen til de rørledninger,der er indrettet til at ligge ud for de hf traktorhjulene dannede spor, opnåelig ved lukning og åbning af de tilsvarende udløbsåbninger ved hjælp af reguleringsskydere, som er forbundet med en med friløb forsynet' betjeningsmekanisme.DE sowing specification 26 09 323 discloses a seed drill of the kind described above. With this seed drill, the periodically recurring out-15 and connection of the material supply to the pipelines arranged to lie off the tracks formed by the hf tractor wheels is obtainable by closing. and opening the corresponding outlet openings by means of control sliders, which are connected to a remote-controlled operating mechanism.

20 Denne såmaskine udmærker sig ved nøjagtigt indstillelige og under arbejdet i marken nøjagtigt opretholdte såmængder. Det er imidlertid en ulempe, at der til ud- og indkobling af materialetilførslen må udføres forholdsvis store bevægelser af reguleringsskyderne. Da reguleringsskyderne herunder må be-25 væge sig gennem det fra udløbsåbningerne udstrømmende såmateriale må der samtidig overvindes store modstandskræfter, hvilket ikke blot nødvendiggør en meget kraftig og stabil konstruktion af selve reguleringsskyderne, men også af hele be-tj eningsmekanismen.20 This seed drill stands out for precisely adjustable and accurately maintained seed volumes during field work. However, a disadvantage is that relatively large movements of the control slides must be performed to disengage and switch on the material supply. Since the control sliders must move below through the seed material flowing out of the outlet openings, large resistance forces must be overcome simultaneously, which necessitates not only a very strong and stable construction of the control sliders themselves, but also of the entire actuation mechanism.

30 Endvidere er det en ulempe, at der under lukningen af udløbsåbningerne sker en fastklemning af et ganske vist ringe antal frøkorn mellem reguleringsskyderne og bundklapperne i de til udløbsåbningerne sluttende såhuse. Endelig befinder der sig også umiddelbart efter lukningen af udløbsåbningerne endnu et 2 150652 antal frøkorn på bundklapperne, hvilke korn så vil falde ned i de af traktorhjulene anbragte spor eller med andre ord i de køregader, som ønskes tilvejebragt ved lukningen af udløbsåbningerne. Når sæden vokser op, vil disse frøkorn ikke blot 5 gøre indkørslen til køregaderne vanskelige at se, men de af disse opvoksende planter vil også gå tabt under høsten, idet de nedtromles af hjulene på traktoren for de efterfølgende landbrugsredskaber.30 Furthermore, it is a disadvantage that during the closing of the outlet openings there is a squeeze of a admittedly small number of seed grains between the control sliders and the bottom flaps in the seed housings adjacent to the outlet openings. Finally, immediately after the closure of the outlet openings, there are also a further 2,220,662 seed grains on the bottom flaps, which grains will then fall into the tracks placed by the tractor wheels or, in other words, in the driving streets which are desired to be provided by the closing of the outlet openings. As the seed grows, these seeds will not only make it difficult to see the driveway to the driving streets, but those of these growing plants will also be lost during the harvest as they roll down the wheels of the tractor for subsequent agricultural implements.

Fra DE offentliggørelsesskrift nr. 21 61 643 vendes endvidere, en såmaskine, 10 ved hvilken den til enhver tid ønskede mængde såmateriale opnås ved forskydning af såhjulene ogbestemmes ved disse såhjuls indgrebsområde i såhusenes til udløbsåbningerne sluttende transportkanaler. Til dannelse af køregader er i denne såmaskine såhjulene til de rørledninger, der er indret-15 tet til at ligge ud for de af traktorhjul ene frembragte spor, anbragt drejeligt på doseringsmekanismens såaksel og kan sammenkobles med udrejeligt på denne såaksel anbragte dele.Further from DE Publication No. 21 61 643 is turned a seed drill 10, in which the desired amount of seed material is obtained at all times by displacement of the seed wheels and is determined by the area of engagement of these seed wheels in the conveying channels adjacent to the outlet openings. In order to form driving streets, in this seed drill the seed wheels for the pipelines arranged to lie on the tracks produced by the tractor wheels are rotatably mounted on the dosing shaft of the metering mechanism and can be coupled to parts that can be placed on this seed shaft.

Især har disse såkaldte kastehjuls-såmaskiner den væsent-.lige ulempe, at de til enhver tid ønskede så-20 mængder hverken kan indstilles med den nødvendige nøjagtighed eller kan opretholdes nøjagtigt under arbejdet i marken. Til dannelse af køregaderne er det desuden uheldigt, at de dele, som skal være sammenkoblelige med de drejeligt på såakselen lejrede såhjul, må være nøjagtigt indregulere-25 de, så de med deres koblingselementer griber ensartet ind i såhjulenes koblingselementer. Da der ikke hertil findes fjedrende elementer til udligning af eventuelt forekommende fremstillingstolerancer eller forskelle, som opstår på grund af slid under længere tids brug, er det ikke altid mu-30 ligt at få en sikker ind- og udkobling af de på såakselen drejeligt lejrede såhjul.In particular, these so-called castor seed drills have the major drawback that the desired amount of seed at any time can neither be adjusted with the required accuracy nor can be maintained accurately during field work. In addition, in order to form the driving streets, it is unfortunate that the parts which must be interconnected with the pivot wheels mounted on the seed shaft must be precisely adjusted so that they, with their coupling elements, engage evenly with the coupling elements of the seed wheels. Since there are no resilient elements to compensate for any manufacturing tolerances or differences that occur due to wear during prolonged use, it is not always possible to obtain a safe connection and disengagement of the seed wheels rotated on the seed shaft. .

Formålet med opfindelsen er at forbedre den kendte sidst beskrevne såmaskine, således at der under bibeholdelse af dens fordele fås en nøjagtig indstillelighed og en nøjagtig opret- 150652 3 holdelse af den ønskede udsåningsmængde og en sikrere og uforstyrret periodisk gentaget ud- og indkobling af materialetilførslen.The object of the invention is to improve the known last described seed drill so that, while retaining its advantages, an accurate adjustability and accurate maintenance of the desired seeding quantity and a safer and undisturbed periodically repeated cut-off and switch-on of the material supply are obtained.

Dette er ifølge opfindelsen opnået ved, at såhjulene 5 for de 'rørledninger, der er indrettet til at ligge ud for de af traktorhjulene frembragte spor er lejret drejeligt på såakselen i doseringsmekanismen og er sam-menkoblelige med udrejeligt på såakselen anbragte dele, hvilke dele indbefatter i det mindste ét tandhjul, og de drejeligt på 10 såakselen lejrede såhjul hver er udrejeligt forbundet med et drejeligt på såakselen lejret tandhjul og det udrejeligt på såakselen anbragte tandhjul samt det drejeligt på såakselen lejrede tandhjul over på skiftemekanismen værende tandhjul kan bringes i drivforbindelse med hinanden. Det er her af underordnet be-15 tydning, om ud- og genindkoblingen af materialetilførslen opnås ved ind- og udrykning af tandhjulene eller ved, at det på en i skiftemekanismen drejeligt lejret overføringsaksel anbragte og i indgreb med det på såakselen udrejeligt anbragte tandhjul stående ligeledes udrejelige tandhjul er anbragt 20 drejeligt i forhold til det eller de øvrige tandhjul og ved hjælp af et koblingselement kan sættes i drivforbindelse med det udrejeligt anbragte tandhjul.This is achieved according to the invention in that the seed wheels 5 for the pipelines arranged to lie outside the tracks produced by the tractor wheels are pivotally mounted on the seed shaft in the metering mechanism and are interconnectable with extensible parts located on the seed shaft, which parts include at least one sprocket, and the rotatable sprocket-mounted sprockets each are extendably connected to a rotatable sprocket-mounted sprocket and the sprocket sprocket disposed on the sprocket as well as the rotatably sprocket-mounted sprocket can be brought into driving gear with each other . It is of minor importance here whether the material feed-in and reconnection is achieved by the insertion and extension of the gears or by the fact that a gear shaft rotatably mounted in the shift mechanism is mounted and in engagement with the sprocket which is pivotally mounted on the seed shaft retractable gears are arranged pivotally with respect to the other gear (s) and can be driven into engagement with the retractable sprocket by means of a coupling element.

I en hensigtsmæssig udførelsesform for såmaskinen ifølge opfindelsen har skiftemekanismen mindst ét med en drejeligt lej-25 ret overføringsaksel forsynet cg pa doseringsmekanismen anbragt hen mod og bort fra doseringsmekanismen bevægeligt svingled, og tandhjulene, som kan sættes i kraftoverførende forbindelse med henholdsvis det på såakselen udrejeligt anbragte og drejeligt lejrede tandhjul, er udrejeligt anbragt på over-30 føringsakselen. Denne udførelsesform udmærker sig ved, at man undgår enhver form for ekstra koblingselementer og nøjagtig tilpasning af disse. En yderligere forenkling af skiftemekanismen opnås ved, at svingleddet er anbragt svingbart og er forbundet med en i indgrebsretning af de på overføringsakselen anbragte tandhjul i de på såakselen anbragte tand- 4 150652In a suitable embodiment of the seed drill according to the invention, the shifting mechanism has at least one rotatably mounted transmission shaft and on the metering mechanism disposed towards and away from the metering mechanism movable pivot joint, and the gears which can be inserted into the pivotally connected shaft with the transmission shaft. and pivotally mounted gears are extensibly disposed on the transmission shaft. This embodiment is distinguished by avoiding any kind of extra coupling elements and accurate fitting thereof. A further simplification of the shifting mechanism is achieved in that the pivot joint is pivotally mounted and is connected to an engaging direction of the gears placed on the transfer shaft in the gears placed on the seed shaft.

Ifølge opfindelsen kan betjeningsmekanismen endvidere have et friløb, og betjeningsarmen for friløbet kan ved hjælp af et fleksibelt forbindelseselement være tilsluttet en på den såmaskinen trækkende traktor fastgjort del, og forbindelses-5 elementets virksomme længde kan være foranderlig. Ved hjælp af dette forbindelseselement med foranderlig længde opnås, at friløbet ved løftning og sænkning af traktorens løfteanordning også inden for de forskellige løfteområder kun drejes så langt, som det er nødvendigt for den periodiske ud- og indkobling af 10 materialetilførslen. Når der på svingleddet er fastgjort et låseelement, som ved udløst kraftoverførende indbyrdes forbindelse mellem tandhjulene griber ind i de på såakselen drejeligt lejrede tandhjul opnås den yderligere fordel, at de på såakselen drejelige tandhjul selv efter længere tids arbejde må blive 15 stående, således at materialetilførslen med sikkerhed er fuldstændigt udkoblet.In addition, according to the invention, the operating mechanism may have a free run, and the operating arm of the free run may be connected by means of a flexible connecting element to a part attached to the tractor and the effective length of the connecting element may be variable. By means of this variable-length connecting element, it is achieved that the free run when lifting and lowering the tractor's lifting device is also rotated within the various lifting areas only as far as is necessary for the periodic switching off and switching on of the material supply. When a locking element is fixed on the pivot joint, which by triggered force-transmitting interconnection between the cogs engages in the cogs mounted on the seed shaft, the additional advantage is obtained that the cogs rotating on the cog shaft must remain standing even after prolonged work, so that the material supply with safety is completely switched off.

En yderligere forenkling opnås ved, at de på såakselen anbragte tandhjul udgør en del af såhjulene.A further simplification is achieved in that the gears placed on the seed shaft form part of the seed wheels.

Ifølge opfindelsen kan skiftemekanismen være opdelt i to ens-20 artede enkeltdele svarende til traktorhjulenes to spor. Herved undgås, at skiftemekanismen bliver for lang, og at der i den drejeligt lejrede overføringsaksel er risiko for vridning under længere tids brug.According to the invention, the shifting mechanism can be divided into two identical individual parts corresponding to the two tracks of the tractor wheels. This avoids that the shifting mechanism becomes too long and that in the pivotally mounted transmission shaft there is a risk of twisting over extended use.

Opfindelsen forklares nærmere i forbindelse med tegningen, 25 hvor fig. 1 viser en til en traktors trepunktsophæng koblet såmaskine ifølge opfindelsen set i længdesnit parallelt med køre-retningen, fig. 2 en detalje af såmaskinens skiftemekanisme i større måle-30 stok og set bagfra, fig. 3 et snit efter linien I-I i fig. 2 og 5 150652 fig. 4 betjeningsmekanismen for maskinens skiftemekanisme i større målestok og set i snit parallelt med køreretningen.The invention is explained in more detail in connection with the drawing, in which fig. 1 is a longitudinal sectional view of a sowing machine coupled to a tractor's three-point suspension according to the invention, FIG. 2 shows a detail of the drill's shift mechanism on a larger scale and seen from behind; FIG. 3 is a section along line I-I of FIG. 2 and 5 FIG. 4 shows the operating mechanism of the machine's shift mechanism on a larger scale and viewed in section parallel to the direction of travel.

Den viste såmaskinen 1 er koblet til trepunktsophængningen 2 på en traktor 3 og har en forrådsbeholder 4 med et antal ud-5 løbsåbninger 6, som er anbragt ved siden af hinanden på tværs af køreretningen, som er vist med en pil 5. Uden for disse udløbsåbninger 6 er en doseringsmekanisme 7 anbragt på forrådsbeholderen 4. Denne doseringsmekanisme er udstyret med en drejeligt lejret og på kendt, ikke vist måde over et re-10 guleringsgear trukket såaksel 8, på hvilken der ud for hver udløbsåbning 6 er anbragt et såhjul 9 og 9 1. hvert såhjul er til siderne omgivet af et såhus 10, hvori der findes en bundklap 11, og til hvilket en rørledning 12 er forbundet. Ved den nederste ende af hver rørledning 12 fin-15 des et såskær 13, som ved hjælp af en skærholder 14 er anbragt svingbart i lodret plan på såmaskinens 1 ramme 15.The seed drill 1 shown is coupled to the three-point suspension 2 of a tractor 3 and has a storage container 4 with a number of outlet openings 6 arranged side-by-side across the direction of travel shown by an arrow 5. Outside these outlet openings 6 are a metering mechanism 7 disposed on the storage container 4. This metering mechanism is provided with a pivotally mounted and in a known, not shown manner drawn over a regulating gear 8 shaft 8, on which a seed wheel 9 is placed next to each outlet opening 6 and 9 1. Each seed wheel is surrounded on the sides by a seed housing 10, in which is provided a bottom flap 11, to which a pipeline 12 is connected. At the lower end of each conduit 12 is found a seed cutter 13 which is pivotally mounted vertically on the frame 15 of the seed drill 1 by means of a cutter holder 14.

Det fra udløbsåbningerne 6 i forrådsbeholderen udstrømmende såmateriale bliver nu i med doseringsmekanismen 7 indstillelige mængder gennem såhusene 10, rørledningerne 12 og skæ-20 rene 13 nedfældet i jorden. For at man svarende til arbejds-bredden af efterfølgende landbrugsredskaber, som ved anvendelse af den såkaldte køregademetode må have samme arbejds-bredde som såmaskinen 1 eller et multiplum heraf, periodisk svarende til forholdet mellem arbejdsbredderne kan ud- og 25 indkoble i rørledninger 12 og skær 13, der er indrettet til at ligge ud for de aftraktorens kørehjul 17 frembragte spor 18, findes der oven over såakselen 8 en skiftemekanisme 19. Denne skiftemekanisme 19 består af to enkeltdele, én for hvert spor 18.The seed material flowing from the outlet openings 6 in the storage container now becomes adjustable in the soil with the metering mechanism 7 through the seed housings 10, the pipelines 12 and the cutters 13. In order to correspond to the working width of subsequent agricultural implements, which, using the so-called driving method, must have the same working width as the seed drill 1 or a multiple thereof, periodically corresponding to the ratio of working widths can be switched off in pipelines 12 and cut 13, which is arranged to lie out of the tracks 18 of the tractor 17 produced by the tractor 17, there is a shift mechanism 19 above the saw shaft 8. This shift mechanism 19 consists of two individual parts, one for each track 18.

30 Som det tydeligt ses af fig. 2 og 3, har hver enkeltdel 20 en svingbart på forrådsbeholderen 4 anbragt svingled 21. I dette svingled 21 er en overføringsaksel 22 drejeligt lejret, og på denne er udrejeligt fastgjort to tandhjul 23 og 24 i samme afstand a som afstanden mellem såhjulen 9 og 9'.30 As is clearly seen in FIG. 2 and 3, each part 20 has a pivotable linkage on the supply container 4 arranged in the pivot container 21. In this pivotal joint 21, a transmission shaft 22 is pivotally mounted, and two gears 23 and 24 are pivotally attached thereto at the same distance a '.

35 Såhjulene er ved hjælp af koblingsstifter 27 udreje- 6 150652 ligt forbundet med tandhjul 25 og 26 ved deres ene ende, og tandhjulet 25 er drejeligt anbragt på såakselen 8, medens tandhjulet 26 er udrejeligt forbundet med såakselen. Tandhjulet 26 med såhjulet 9' befinder sig inden i det såhus 10, 5 som står i forbindelse med den rørledning 12, gennem hvilken såmaterialet inden for det af kørehjulene 17 på traktorens 3 ene side frembragte spor 18 føres ned i jorden 16.The seed wheels are releasably connected to gears 25 and 26 at one end by means of coupling pins 27, and the gears 25 are pivotally mounted on the seed shaft 8, while the gears 26 are extensibly connected to the seed shaft. The gear 26 with the seed wheel 9 'is located within the seed housing 10, 5 which communicates with the pipeline 12, through which the seed material is brought into the ground 16 within the track 18 produced by the running wheels 17 on one side of the tractor 3.

På svingleddet 21 er endvidere påsvejs en stiver 28, til hvis yderste ende et bowdentræk 29 for den i fig. 1 og 4 viste be-10 tjeningsmekanisme 30 er fastgjort. Desuden er en fjeder 31 ved sin ene ende i forbindelse med stiveren 28 og ved sin anden ende i forbindelse med såhuset 10, og denne fjeder udøver på stiveren 28 en kraft i retning mod den stilling, hvor tandhjulene 23 og 24 er i indgreb med tandhjulene 25 og 26. I den-15 ne i fig. 2 og 3 viste stilling føres materialet i forrådsbeholderen 4 af alle såhjulene' ind i rørledningerne 12. Dersom der skal udsås finsæd, trykkes koblingsstifterne 27 ud af tandhjulene 25 og 26, så såmaterialet kun transporteres ind i rørledningerne 12 ved hjælp af tandhjulene 25 og 26.Further, on the pivot joint 21, a strut 28 is welded to, the outer end of which is a bow tie 29 for the one shown in FIG. 1 and 4, operating mechanism 30 is secured. In addition, a spring 31 at one end in connection with the strut 28 and at its other end in connection with the seed housing 10, and this spring exerts on the strut 28 a force towards the position where the gears 23 and 24 engage the gears. 25 and 26. In the one of FIG. 2 and 3, the material in the supply container 4 of all the seed wheels' is fed into the pipelines 12. If fine seed is to be seeded, the coupling pins 27 are pushed out of the gears 25 and 26, so that the seed material is transported into the pipelines 12 only by the gears 25 and 26 .

20 Dersom der nu til dannelse af køregader ikke af de med tandhjulene 25 sammenkoblede såhjul 9 henholdsvis af tandhjulene 25 selv skal føres såmateriale gennem de over såhusene 10 tilsluttede rørledninger 12 til sporene 18, så svinges stiveren mod spændingen i fjederen 31 opad i retning af pilen 25 32, så indgrebet mellem tandhjulene 23 og 24 og tandhjulene 25 henholdsvis 26 udløses. Samtidig svinges et på svingleddet 21 anbragt låseelement 33 i retning af pilen 34 og kommer i indgreb med tandhjulet 25, så dette tandhjul og dermed hele det tilhørende såhjul 9 bliver stående.20 If, for the purpose of forming driving paths, the seed wheels 9 and 9 of the gears 25, which are connected to the gears 25 themselves, do not have to pass seed material through the piping 12 connected to the seed housings 10 to the grooves 18, then the strut pivots against the tension in the spring 31 upwards in the direction of the arrow. 25 32, so that the engagement between the gears 23 and 24 and the gears 25 and 26, respectively, is triggered. At the same time, a locking element 33 arranged on the pivot joint 21 is pivoted in the direction of the arrow 34 and engages the gear 25 so that this gear and thus the entire associated seed wheel 9 remains standing.

30 Den i fig. 4 detaljeret viste betjeningsmekanisme 30, der som vist i fig. 1 er anbragt på forrådsbeholderen, har et friløb 35, som består af et i huset 36 anbragt palhjul 37 og en i palhjulets tænder 38 indgribende elastisk udformet tilbageholderpal 39. Et knasthjul 40 er udrejeligt forbundet med palhjulet 7 150652 37, og dette knasthjul har et antal knaster 41, som nøjagtigt svarer til halvdelen af antallet af tænder 38 på palhjulet 37.The embodiment of FIG. 4 shows detailed operation mechanism 30 which, as shown in FIG. 1 is disposed on the storage container, has a clearance 35 which consists of a pawl wheel 37 disposed in the housing 36 and an elastically shaped retaining pawl 39 engaging in the teeth of the pawl 38. A cam wheel 40 is extensibly connected to the pawl wheel 7 and this cam wheel has a the number of bosses 41 which corresponds exactly to half the number of teeth 38 on the impeller 37.

I mekanismens hus er endvidere anbragt en svingbar vægtarm 42, 5 hvorpå er drejeligt lejret en med knasthjulet 40 flugtende rulle 43, og bowdentrækket 29 er forbundet med den fri ende af vægtarmen 42, En betjeningsarm 44 er endvidere lejret svingbart i huset 36, og ved dens inderste ende er svingbart anbragt en i tænderne 38 på palhjulet 37 indgribende strop 45, 10 som ved hjælp af en fjeder 46 trykkes ind mod palhjulet 37.Furthermore, in the housing of the mechanism is arranged a pivotable weight arm 42, 5 on which is rotatably mounted a roller 43 flush with the cam wheel 40, and the bow pull 29 is connected to the free end of the weight arm 42, An operating arm 44 is furthermore pivotally mounted in the housing 36, and its innermost end is pivotally positioned a strap 45, 10 engaging in the teeth 38 of the pawl wheel 37 which is pressed against the pawl wheel 37 by a spring 46.

Ved den yderste ende af betjeningsarmen 44 er som vist i fig.At the outer end of the control arm 44, as shown in FIG.

1 fastgjort et fleksibelt forbindelseselement 47 i form af en snor, hvis anden ende er fastgjort til en del 48 på traktoren 3. Mellem huset 36 og vægtarmen 42 er endvidere anbragt en 15 trykfjeder 49, som påvirker vægtarmen 42 med en kraft i retning mod knasthjulet 40. I stedet for denne fjeder 49 eventuelt sammen med denne kan der også på hver enkeltdel 20 af mekanismen være anbragt en med bowdentrækket 29 forbundet trækfjeder 50 som vist i fig. 1.1, a flexible connecting member 47 is fixed in the form of a cord, the other end of which is fixed to a part 48 of the tractor 3. A further compression spring 49 is applied between the housing 36 and the weight arm 42, which actuates the weight arm 42 with a force towards the cam wheel. 40. Instead of this spring 49, optionally with it, there may also be applied to each part 20 of the mechanism a tension spring 50 connected to the bowden pull 29 as shown in FIG. First

20 I den i fig. 1 viste stilling af vægtarmen 42 befinder tandhjulene 23 i skiftemekanismen 19 sig i indgreb med· de på såakselen 8 anbragte tandhjul 25 og 26, således at såmaterialet føres ned i jorden 16 gennem samtlige rørledninger 12 og såskær 13.20 In the embodiment of FIG. 1, the gears 23 of the shifting mechanism 19 are in engagement with the gears 25 and 26 located on the saw shaft 8, so that the seed material is introduced into the ground 16 through all the pipes 12 and the cutter 13.

25 Hvis såmaskinen 1 nu ved hjælp af trepunktsophængningen 2 løftes ved enden af marken, så svinges den yderste ende af betjeningsarmen 44 ved hjælp af forbindelseselementet 47 nedad, og den bageste ende af betjeningsarmen 44 svinges opad. Herved drejes palhjulet 37 en tand 38 fremad forbi tilbageholderpalen 30 39. Knasthjulet 40 drejer over samme vinkel, hvorved rullen 43 kommer ind i fordybningen mellem to knaster 41, og bowdentrækket 29 bevæges så langt, at tandhjulene 23,24 kommer ud af indgreb med tandhjulene 25,26. I dette tilfælde tilføres intet såmateriale gennem rørledningerne 12 til traktorhjulenesIf the seed drill 1 is now lifted by the three-point suspension 2 at the end of the field, the outer end of the control arm 44 is pivoted downwards by the connecting element 47 and the rear end of the control arm 44 is pivoted upwards. Hereby, the pinwheel 37 rotates a tooth 38 forwards past the retaining pawl 30 39. The cam wheel 40 rotates at the same angle, whereby the roller 43 enters the recess between two lugs 41, and the bow pull 29 is moved so far that the gears 23,24 come out of engagement with the gears. 25.26. In this case, no seed material is fed through the pipelines 12 to the tractor wheels

Claims

When the seed drill 1 is lowered again, the flexible connecting element 47 is released, so that the strap 45, under the influence of the spring 46, enters the next tooth 38 in the impeller 37. When the seed drill 1 again lifted at the other end of the field, the process described above is repeated, however, the roller 43 now again moves up on a cam 41, so that the gears 23, 24 by means of the bow pull 29 again engage 10 with the gears 25 and 26, thus, seed material is applied through all the pipelines 12. By means of this operating mechanism 30 a driving street is formed at every other working path of the seed drill 1, so that the subsequent agricultural machines must have a working width twice as large or four times as long. greater than the working width of the seed drill 1. If the subsequent agricultural implement has a working width three times the working width of the seed drill, you just need to cut the second cam wheel 40 with a second cam wheel having only a number of 20 bosses corresponding to a third of the number of teeth 38 on the pawl wheel 37. In this case, only one driving lane is formed at every three working paths laid by the drill 1. 25 Patent claims.

1. Seed drill intended to be coupled to a tractor and with 2g a storage container having a plurality of openings through which the seed material in the storage container is fed over a dosing mechanism with a controlled rotational speed shaft and then placed seed wheels connected to the dosing mechanism to pipes connected to the dosing mechanism. which only prays: emitted by the speed of the seed wheels, and where the pipelines arranged to lie out of the tracks produced by the tractor wheels by means of a shifting mechanism can be switched in and out in periodic recurring order to produce of so-called driving streets for subsequent agricultural implements, characterized in that the seed wheels (9). for the pipelines (12) arranged to lie opposite the tracks (18) provided by the tractor wheels (17) pivotally arranged on the shaft (8) of the metering mechanism (7) and interconnectable with the shaft (8) extendable 5 brought parts, which include at least one sprocket (26), wherein the sprocket (8) mounted on the seed shaft (8) is each pivotally interconnected by a pivot (25) rotatable on the seed shaft (8), and the sprocket (25) (8) retractable sprockets (26) as well as the rotatable sprockets (25) mounted on the seed shaft (8) are adapted to be interconnected to a transmitting mechanism (19) located on a shift mechanism (19,24).

Seed drill according to claim 1, characterized in that the shifting mechanism (19) has at least one gear shaft (22) pivotally mounted and rotatably pivoted (21) on the metering mechanism (7) towards and away from the metering mechanism (7). and that the gears (23, 24) which can be put into power transmission with the pivot (8) pivotally mounted and rotatably mounted on the seed shaft (8), respectively, are pivotally mounted on the transfer shaft (22).

Seed drill according to claims 1 and 2, characterized in that the pivot joint (21) is arranged pivotally and is connected to a spring (31) which acts in the direction of engagement between the gears (23, 24) arranged on the transfer shaft (22). ) and the gears (25, 26) located on the seed shaft (8), and are connected to an operating mechanism (30).

Seed drill according to claims 1-3, characterized in that the operating mechanism (30) has a free run (35) and that a control arm (44) for the free run (35) is arranged over a flexible connecting element (47) for connection. with a tractor (3) towed on the drill (1) attached to the drill (1), and the effective length of the connecting element (47) being variable.