| 摘要 |
Seed drill (1) is capable of being towed by a four wheeled motorbike and has a container (2) which acts as a seed hopper. Positioned underneath the container (2) is a metering device (3) which is described in greater detail in Figures 2 and 3. Below the metering device (3) are a number of tubes (4) which are seed outlets to which the metering device (3) feeds the seed it receives from the container (2). There are six seed track/outlet combinations, one for each of the outlets (4). A peripheral guide forms part of the metering device (3). The peripheral guide is a disc of material that defines an aperture. On the inner walls of the guide is a seed track and an outlet. At the base of the seed track is a flange. A vertical-axis rotor fits within the aperture of the guide. The rotor rotating within the aperture causes seed falling from the container (2) onto the guide to be dragged down into the inside walls of the guide. The seeds are guided by a seed track to the guide outlet and into the appropriate seed outlet. The flange enables a column of seeds to build up within the seed track providing some independence of the availability of the seed to the rotor from the container (2).
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