Sound head positioning device for small-sized cineprojector

Claim 1

A sound head positioning device for use with an insertable cartridge having film therein in a cineprojector, comprising: a baseplate having a main flat portion and at least one end portion extending transversly thereto, said end portion having a slot formed therein; a guide shaft fixedly mounted in the cineprojector and extending loosely through said slot; a guide plate fixedly mounted in the cineprojector; a pin formed on said end portion and adapted to abut said guide plate when said baseplate is rotated around said guide shaft; a spring fixed at one end to the cineprojector and at the other end to said baseplate tending to exert a clockwise bias on said baseplate; means mounting a sound head on said flat portion of said baseplate; said baseplate rotatable counterclockwise against the bias of said spring to an intermediate position by inserting movement of the cartridge contacting said end portion, said pin abutting said guide plate at the intermediate position, and said guide shaft located in one end of said slot in the intermediate position; and said baseplate linearly slidable from the intermediate position to a final position by continued insertion of the cartridge contacting said end portion whereby said sound head contacts the film, said slot being slidable relative to said guide shaft so that said guide shaft is located in the other end of said slot in the final position.