Sowing machine for dispensing seeds unto seed beds

Claim 1

Device for simultaneous mechanical sowing of a number of seeds distributed to a predetermined number of sowing places with a predetermined number of seeds per sowing place, comprising a supply of seeds of the type in question, as well as a seed transporting device which can be moved from a first position immediately at the seed supply to a second position immediately above the surface to be sown, at which the seed transporting device has the same side facing against the seed supply and the surface to be sown, and at which this side is provided with a number of seed lifters, the number and position of which correspond to the number and position of the desired sowing places, at least at part of the surface to be sown, and in addition to which the seed lifters are arranged in such a way, that when the seed transporting device is in its first position immediately at the seed supply, the seed lifters catch the required number of seeds, and when the seed transporting device is moved to its second position, and the seed lifters are immediately above the predetermined sowing places, the seeds detach so that they drop down to the sowing places, characterized in that each one of the seed lifters consists of a suction nozzle, each said suction nozzle having a plurality of spaced openings for each seed desired per sowing place, that the diameters of the openings of the suction nozzles, which openings through the interior of the seed transporting device are switchably connected to the suction side and the pressure side respectively of an air compressor, is considerably less than that of the seed type in question, each one of the suction nozzles comprises a nozzle nipple which is fixed to an opening in the bottom of the seed transporting device and extends down below the bottom and is provided with an axial central opening with its mouth surrounded by a plane field bounded by one or more plane or curved surfaces which form an angle to the field and slope in the direction of the same bottom which plane or curved surfaces have no openings, that the field about the central mouth of the opening is bounded by the end edge at the narrower end of a mantle surface shaped as a truncate cone, which diverges in the direction of the said bottom, that the opposite end edge of the truncate cone-shaped mantle surface is bounded by one end edge of an essentially cylindrical mantle surface, and that the cylindrical mantle surface is divided by one or more plane fields into one or more curved part fields separating the fields from one another, at which these plane fields have essentially the same surface as the plane field about the mouth of the central opening and are in their turn provided with central openings which by way of the interior of the seed lifters communicate with the compressor, the sideway dimension of said plane fields does not essentially surpass the size of the seed type in question, the distance between the different openings in one aNd the same seed lifter are so chosen and the plane fields are so arranged relative to one another and relatively to the bottom of the seed transporting device, that a seed of the type in question which is resting against the plane field about one of the openings does not contact or collide with the bottom of the seed transporting device, or with seeds resting against the plane fields about the other openings of the seed lifter.