| 摘要 |
A hopper for mechanical seed planters comprises an upper and a lower reservoir shaped for retaining seed therein, and a valve mounted between the reservoirs to selectively permit the seed to flow under gravitational forces from the upper to the lower reservoir. The lower reservoir is rotatably mounted in the hopper, and is rotated in synchronization with the planting speed of the planter. The bottom of the lower reservoir has at least one metering aperture therethrough, and a circularly shaped groove which is concentric with the lower reservoir's axis of rotation, and extends through the metering aperture. An arm is pivotally connected with the upper reservoir, and includes a tip portion which tracks in the circular groove. A stationary base plate is disposed directly below the reservoir bottom, and includes a discharge aperture which is circumferentially aligned with the metering aperture. The arm tip is positioned directly above the discharge aperture, whereby rotation of the lower reservoir sequentially aligns the metering and discharge apertures for accurate seed planting without abrading the seed.
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