| 摘要 |
A single-seed dispenser of a pneumatic precision sower includes a seed supply container, a housing defining a suction chamber, and rotatable perforated dispenser disc interposed between the supply container and the housing. At least one partition member is disposed at the rear surface of the disc in the housing wherethrough air is aspirated for drawing the seeds onto the disc. The partition member(s) covers only portions of the perforations at least over the circumferential extent of the disc over which suction in the suction chamber acts through the perforations. Thus, elongate very narrow seeds are prevented from passing through the perforations. A drive disc for driving the dispenser disc includes pins projecting through bores in the dispenser disc not only to transmit rotation of the driver disc to the dispenser disc but also to agitate the seeds in the bottom of the seed supply container. A stripper for stripping excess seeds from the dispenser disc includes two spaced apart plates. One of the plates has a crenulate edge overlying the perforations on the side of the disc facing the seed supply container. The disc extends into a recess defined between the plates and positions the stripper correctly by guiding the same at a surface of the stripper defining the bottom of the recess.
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