| 摘要 |
Seed spacing drill which selects the seeds one by one by depression and relaxation of the seeds at a given point by eliminating the depression, of the type including a belt provided with holes the internal face of which is subjected to a depression over a part of its travel and passing through a seed reservoir at the beginning of its travel in depression, characterised in that it includes a box structure which is constantly depressurised inside which the upper pulley and lower pulley 18, 19 project partially, over which pulleys the belt 20 is wound, these two pulleys 18, 19 each being provided with a groove 18a, 19a which communicates with the enclosure of the box structure 25. <IMAGE>
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