Sensor for a header height control system

A header height sensor for a harvesting head of an agricultural combine, the header height sensor comprising:

• an elongate sensor arm (112) having an upper end (150) that defines an aperture (160) configured to receive a shaft (154) and a lower end;
• a reversing joint (114) that comprises a housing (152) configured to receive the upper end of the elongate sensor arm (112);
• the housing (152) including a mechanical stop (174) to prevent movement of the elongate sensor arm 112) with respect to the housing (152) in a first direction beyond the first limit of travel, the reversing joint (114) further comprising a pair of springs (162, 164) disposed on either side of the upper end (150), the pair of springs (162, 164) being coupled to the housing (152) and to the upper end (150) to push the upper end (150) against the mechanical stop (174), wherein the shaft (154) extends through both springs (162, 164) and through the aperture (160) in the elongate sensor arm (112), and is supported at a first end and at the second end on housing (152);
• a bracket (106) configured to be fixed to a plastic point (100), and being also configured to support an upper portion of the reversing joint (114) for relative rotational movement about a laterally extending longitudinal axis (196);
• and
• a rotary position sensor (116) coupled to bracket 106 and coupled to reversing joint (114) such that movement of the reversing joint (114) with respect to the rotary position sensor (116) causes an electrical signal from rotary position sensor (116) to change as a function of the relative rotation.