Abstract: A wheel (4) for setting sown seeds, for use in a sowing machine, is rigidly connected in rotation with at least one gauging wheel (5) having a rolling radius smaller than the radius of the periphery of the setting wheel (4). The gauging wheel (5) is a wheel with a deformable peripheral coating, such as a low pressure pneumatic tire (13).

Abstract: A selector device for a distributor of a so-called "single-seed" seed drill. It comprises a transportation member, a surface of which moves continuously between a seed hopper and a transportation device with, in that surface, orifices communicating with a vacuum source for maintaining by suction the seeds against that surface. A groove formed on the distributor surface extends over the suction orifice, the axis of the groove being perpendicular to the path of travel of the suction orifice, with a deflector the limit of the action range of which is clear from the path of travel of the axis of the suction orifices by about the radius of a seed.

Abstract: A distribution device for a single-seed seed drill, comprises a rotatable plate 5 having a peripheral rim 6 and a substantially vertical axis of rotation. The rim 6 has recesses 9 substantially parallel to the axis of rotation and regularly spaced angularly about a circle 10 of the rim, the horizontal section of these recesses and the thickness of the rim corresponding substantially to the size of a seed. The recesses move above a fixed rim 11 in which are provided, directly below the recesses 9 of the rotatable plate, openings 13 for communication with a transport device 14 which leads to a seed drill. A barrier 22, 22' upstream of each opening 13 in the fixed plate, is provided to retain seeds not engaged in the recesses of the rotatable plate. A brake 18, 39 or 52 for the outflow of seeds is interposed between the central portion of the rotatable plate onto which the seeds are fed, and the barrier 22, 23 or 50.

Abstract: The present invention relates to a pneumatic transport device particularly for seed drills. The device comprises an inlet tube 10 into which the seeds are introduced one by one, an annular passage 13 of convergent form for air under pressure at the periphery of the end of the inlet tube 10 and a cylindrical passage 14 whose end is connected to the pneumatic transport tube 17 and, according to the invention and downstream and at a small distance from the neck of the annular passage 13 of convergent form, at least one opening 18 communicating between the cylindrical passage 14 and the atmosphere. The invention is applicable particularly to a seed drill comprising a central distributor which feeds a large number of ploughshares.

Abstract: The present invention concerns a process and apparatus for sowing seeds in so-called precision sowing and a distributor for practicing such a process. The distributors comprise, for each furrow, a ploughshare 4 opening the furrow, a pneumatic transport channel 6 for seeds abutting opposite the furrow 8 and a setting wheel 1 sinking the seeds distributed in the furrow. The seed is, at the outlet of the pneumatic transport channel of the distributor, projected toward the apex D of the dihedral formed by the forward peripheral surface of the setting wheel and the bottom of the furrow.