| 摘要 |
A seed planting device has a planting wheel rotatable about an axis 74 to roll over a land 38. Hollow tines 50 mounted at angular spacings on the wheel 22 extend outwardly. A seed cell 66 in each tine has an inlet 118 for receiving a seed and an outlet 69 towards an outer end. A seed dispensing mechanism 56 dispenses seeds individually to the seed cells via ducts 60. A release member 70 in each seed cell is movable between a retain condition for retaining a seed and a release condition for releasing the seed. Control for controlling the members 70 includes a control rotor 92 rotatable about an axis 94 parallel to and spaced from this axis 74 a predetermined amount in a predetermined direction, and link means linking each member 70 to a predetermined position on the rotor 92 such that the member is in its retain condition while the tine moves through angular positions approaching a position in which the tine penetrates the land 38, and such that the member is in its release condition when the tine is at its penetrating position.
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