| 摘要 |
A seed planting device has a planting wheel (22) 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 means 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. <IMAGE> |
