Sound reproducing device driven by a constant torque pull string type spring and started by selective starter rods for playing multiple record grooves

Abstract

A winding string, when stretched tight, will lift a speaker unit which applies a stylus pressure to a pickup so that the pickup is allowed to reverted back to the starting point of sound reproduction. The stretched string will also lift a plunger carrying a stopper block to axially advance so as to be in engagement with a retainer piece disposed on the record disc. The plunger is normally urged by a first spring toward a direction in that the stopper block may retract away from the engagement with the retainer piece disposed on the record disc. The advanced position of the plunger, at which the stopper block engages the retainer piece is sustained by a lever movable in a see-saw like swing motion. The lever is actuated by the movement of an intermediate starter member initiated by the depression of any one of the selective starter rods provided in number corresponding to that of recorded grooves and thereby releases the record disc from its temporarily stopped condition. In this manner, a locking block attached on the reverse face of the record disc engages one of the selective starter rods having advanced by depression and causes guide portion of the selected record groove to be positioned for next engagement with the pickup. Release of the depression on the selective starter rod accompanied by its retraction causes both the intermediate starter member and a center shaft to retract due to absence of supporting, which further causes speaker unit to move downward and enables subsequent sound reproduction.