| 摘要 |
<p>A seed-spacing drill comprises a discharge disc, which constitutes the rear wall of a seed box and has suction openings for sucking the grains and communicates with a suction fan and discharges the grains of seed through a discharge opening of the seed box out of the latter. To ensure that only a single grain will be discharged at a time, the discharge disc consists of two parts, namely, a disc body, which communicates with the suction fan, and a disc blade, which contacts the disc body on the side facing the supply of seeds in the seed box. One of said parts is stationary and has a guide slot, which defines the discharge path. The other part is rotatably mounted and has peripherally spaced apart entraining slots, each of which extends throughout the radial extent of the guide slot.</p> |
