| 摘要 |
<p>PURPOSE:To control soil covering pressure from zero to high pressure, by setting an elastic pressure member to supply reduced pressure in the opposite direction to an elastic pressure member applying downward pre-load to soil covering plates. CONSTITUTION:Soil covering adjusting mechanism 33 is set between an attaching lever 31 for a soil covering device 30 and a seeding float 17. The adjusting mechanism 33 has an oscillating arm 39, an interlocking member 36 and a pair of elastic pressure members (coil springs) 43A and 43B. When an inner cable 38b is drawn through an operation lever, the oscillating arm 39 is oscillated in the arrow a direction, the interlocking member 36 is elastically pressed in the arrow b direction through the elastic pressure member 43A and downward elastic pressure is applied to soil covering plates 32A and 32B.</p> |
