초록 ▼

An automatic table height control for a combine harvester including a height sensing assembly and a control system. The height sensing assembly includes a finger support shaft rotatably journaled on the bottom of the table. A spring is provided to rotate the shaft in one direction. A plurality of gr

An automatic table height control for a combine harvester including a height sensing assembly and a control system. The height sensing assembly includes a finger support shaft rotatably journaled on the bottom of the table. A spring is provided to rotate the shaft in one direction. A plurality of ground engaging fingers are pivotally connected to the finger support shaft. A lost motion connection is provided to limit rotation of the finger support shaft relative to each finger. An iron vane is attached to one end of the finger support shaft. A pair of proximity switches are mounted on the crop harvesting table adjacent the path of movement of the iron vane. When the vane is close to both proximity switches, they are open. When one of the ground engaging fingers rotates the iron vane away from one proximity switch that switch closes and energizes a relay in the control system that energizes a solenoid on the header height control valve to raise or lower the table. The position of the proximity switches on the table is adjustable to set the height at which the system holds the table above the ground. The control system includes a switch and timer which automatically raise the table for a given period of time when the ground drive is reversed. The control system also includes a latching relay that deenergizes the automatic control when the combine is reversed and energizes the automatic control when the manual height switch is moved to the position for lowering the table.

대표청구항 ▼

An improved combine harvester automatic table height control including a combine harvester frame, driven wheels supporting the frame above the ground, drive means on the frame connected to the driven wheels, an elevator housing pivotally attached to the frame, a crop harvesting table attached to the

An improved combine harvester automatic table height control including a combine harvester frame, driven wheels supporting the frame above the ground, drive means on the frame connected to the driven wheels, an elevator housing pivotally attached to the frame, a crop harvesting table attached to the free end of the elevator housing, a hydraulic cylinder attached to the frame and the elevator housing operable to raise and lower the crop harvesting table, a hydraulic valve capable of directing hydraulic fluid to and from the hydraulic cylinder, a height sensing assembly attached to the crop harvesting table, and a control system operably attached to the height sensing assembly and to the hydraulic valve, characterized by the drive means connected to the driven wheels including a reversible transmission, and the control system including a switch connected to the reversible transmission and to the hydraulic valve capable of raising the crop harvesting table upon the reversible transmission being reversed, and wherein the control system also includes a timer connected to the switch connected to the reversible transmission, and to the hydraulic valve operable to limit the time during which the crop harvesting table is raised in response to closing the switch connected to the transmission.