? implement of agricultural seed planting?

摘要

This is a depth adjustment for an agricultural seed planting implement that has a depth control assembly (60) of side-by-side calibration wheels (62) rotatably attached to a frame (22) with tiller arms. equal feed length (64) in a step ratio. a configurable lever (80, 82) acts on the arms (64) via a control oscillator (86) which has arms (90, 92) with the same step ratio to control ground flow.