| 摘要 |
A mechanism for lifting obstructing leaves from the path of a photo-electric light beam which is being propelled along and above a plant row for photo-electric thinning purposes. The mechanism includes a gauge wheel rolling along each side of the row and leaf-gathering discs positioned between the gauge wheels and over the row and having first transmission means applying torque from said gauge wheels to the leaf-gathering discs to cause the latter to engage and lift plant leaves above the path of the beam and having a second transmission means for frictionally applying torque from either gauge wheel to the other gauge wheel for driving the two gauge wheels simultaneously in unison.
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