COMBINED SEEDING UNIT (VERSIONS) Russian patent published in 2008 - IPC A01C7/00 

FIELD: agricultural engineering.

SUBSTANCE: combined seeding unit has frame, seed hopper, at least one seeding apparatus, wheel drive, penetration mechanisms, and shanks. Seeding unit is further provided with mechanisms for stabilizing motion of each shank in vertical plane, mechanisms for adjusting seeding depth for each shank and mechanisms for synchronizing motion of each shank with soil micro relief. Mechanism for stabilizing motion of each shank in vertical plane has adjusting screw. One end of screw is fixed in adjusting threaded support. Other end of screw extends in sliding manner through opening provided within cylindrical pivot joint which is connected to frame for rotation around horizontal pin fixed in frame. Between cylindrical pivot joint and adjusting threaded support on the underside of frame there is spring through which adjusting screw is passed. Adjusting screw has stroke restricting device positioned outside the cylindrical pivot joint, above frame. Threaded support is pivotally connected to fork for attachment of wheel to shank lug and tine. Mechanism for synchronizing motion path of each shank with soil mesorelief consists of bracket fixed on frame and provided with two pivot joints. Parallel levers equal in length are fixed in pivot joints, their second ends being pivotally fixed on shank tine. According to first version, mechanism for adjusting seeding depth of each shank consists of two threaded rods. One of rods is pivotally fixed on wheel attachment fork and other rod is fixed on shank tine. Other ends of rods are connected by means of Roman nut. Fork is pivotally fixed on shank tine below threaded rod attachment site. According to second version (free of wheels with lugs), shank tine has two brackets with bushings at their ends equipped with openings for attachment of adjustable bars connected to carrier wheels. Bars have set of adjusting openings for retaining fingers passing through horizontal openings in sleeve bodies and openings in bars. Adjusting threaded support is pivotally connected to shank tine.

EFFECT: provision for more precise following of soil mesorelief and uniform distribution of seeds through depth and thereby increased crop yield.

3 cl, 6 dwg