POSITION SENSOR FOR ROTATABLE LAMP CHANGER TURRET

摘要

A position sensor for a rotatable lamp changer turret having a plurality of lamps which are rotated in sequence to an operating position as the lamps burn out. A circular cam is positioned on the turret that includes a first position indicating portion for each of the lamps for indicating when each of the lamps is in the operating position. The cam includes a second position indicating portion for indicating that all of the lamps have been rotated past the operating position. The second position indicating means is located for stopping the turret in a position with all the lamps out of the operating position for providing a visual alarm indication. A cam follower engages the cam and in turn actuates electrical switch means for controlling rotation of the turret. A third cam portion is positioned between each of the first cam portions for actuating the cam follower and the switch means for maintaining turret rotation until the first cam portions are engaged by the cam follower.