Seed spacing drill unit for special crops, e.g. (open space) horticultural crops, tree nurseries

摘要

The pneumatic sowing unit enables seeds to be sown with great accuracy and complete regularity. It consist of a shaking unit 37 cooperating with the enhance of a seed circulation passage 25 of the reservoir to create turbulence which causes the seeds to rise slightly above the admission port 23 of the seeds into the reservoir. This is followed by a vertical fall of the seeds during which they are taken under control by holes in the disc 3 which are aligned along the same radius from one row to another. The seeds are released at the bottom part of the unit under the action of letting to atmosphere, offset in the trenches for setting in depression by an amount one and a half times the interval separating two consecutive holes in the disc. The entrance of the circulation passage 25 consists of an oval-shaped axial boss 30 cooperating with a rounded bevel 29 to form a lip located at the end of the partition 21 and with a boss 30 producing a deformation of the outer wall of the passage. IMAGE