Seeds distribution device for precision sowing machines and precision sowing machine comprising such a device

A seed distribution device for precision sowing machines comprising:

• a housing for a seed selector disc which is mounted for rotation about a central rotation axis and which has at least one ring of holes provided to transport seeds over a circular trajectory having opposite sides;
• a first singulator mounted at a first location on the housing and a second singulator mounted at a separate, independent location on the housing, the first singulator and the second singulator being substantially plate-like and co-planar relative to each other, adjustable relative to each other in a selective and independent manner, and mounted on the housing so as to be radially facing each other at the opposite sides of the circular trajectory and so as to be distal and proximal with respect to the central rotation axis, respectively, the first singulator and the second singulator being configured so as to both act on at least a portion of the circular trajectory, defining a disruptive selection path for the seeds;
• and
• an eccentric element rotatably secured to the housing and to which is fixedly secured a first pin, the first pin being eccentric with respect to the rotation axis of the eccentric element, wherein the housing has a second pin and the first singulator comprises a through-hole and a through-slot, the through-hole being engaged rotatably on the second pin and the through-slot being engaged on the first pin and configured to allow the first pin to translate along the through-slot and the first singulator to move along a circumferential arc with respect to the second singulator during rotation of the eccentric element,
• wherein the eccentric element is located before the second pin with respect to the circular trajectory travelled by the seed as a function of the direction of rotation of the seed selector disc, and
• wherein the first singulator is adjustable relative to the second singulator to modify at least locally the disruptive selection path so as to eliminate duplicates of seeds from the disc without creating failures,
• wherein the first singulator comprises a first plurality of teeth and the second singulator comprises a second plurality of teeth, wherein the second singulator is mounted on the housing through posts that prevent radial and circumferential movement of the second singulator relative to the housing and the first singulator, the first singulator being movable along the circumferential arc so as to modify both the radial and the circumferential distance between the first plurality of teeth and the second plurality of teeth.

A seed distribution device for precision sowing machines comprising:

• a housing for a seed selector disc which is mounted for rotation about a central rotation axis and which has at least one ring of holes provided to transport seeds over a circular trajectory having opposite sides;
• and
• a first singulator mounted at a first location on the housing and a second singulator mounted at a separate, independent location on the housing so as to be radially facing each other at the opposite sides of the circular trajectory and so as to be distal and proximal with respect to the central rotation axis, respectively, the first singulator and the second singulator being configured so as to both act on at least a portion of the circular trajectory, defining a disruptive selection path for the seeds,
• wherein the first singulator is adjustable relative to the second singulator in a selective and independent manner to modify at least locally the disruptive selection path so as to eliminate duplicates of seeds from the disc without creating failures,
• wherein the seed distribution device further comprises an eccentric element rotatably secured to the housing and to which is fixedly secured a first pin, the first pin being eccentric with respect to the rotation axis of the eccentric element, wherein the housing has a second pin and the first singulator comprises a through-hole rotatably engaged with the first pin and a through-slot engaged on the second pin and configured to allow a rotational-translational movement of the first singulator with respect to the second singulator during rotation of the eccentric element, and
• wherein the eccentric element is located before the second pin with respect to the circular trajectory travelled by the seed as a function of the direction of rotation of the seed selector disc,
• wherein the first singulator comprises a first plurality of teeth and the second singulator comprises a second plurality of teeth, wherein the second singulator is mounted on the housing through posts that prevent radial and circumferential movement of the second singulator relative to the housing and the first singulator, the first singulator being movable along a rotational-translational path so as to modify both the radial and the circumferential distance between the first plurality of teeth and the second plurality of teeth.