Attitude control for harvester pick=up - has sensors with raise and lower switches, and magnetic actuator movable as pick=up pivots

摘要

Two sensors are each provided with reed switches, including a group of parallel "raise" switches and a group of parallel "lower" switches. A magnetic actuator is mounted for relative movement with respect to the switches as the pickup pivots with respect to the head. The sensor switches are connected to a circuit for activating a control valve for the head cylinders to raise the head when one or more of the switches in either of the "raise" groups are closed by the actuator. The control valve is actuated to lower the head when at least one of the switches in each of the "lower" groups is closed.