Record player
AssigneeU.S. Philips Corporation
InventorsJozef-Antoon Grosemans, Piet VANDER Lely, Willem Hendrik Stigter
Life of this patent
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Abstract
An automatic diameter selection device for the pick-up arm of a record player. A sensing pin disposed in the turntable is depressed by records greater than a given diameter and cooperates with abutment members to move a plate between a plurality of locked positions. The plate moves only if, after a record has been placed on the turntable, the sensing pin occupies a position which differs from its previous position.
Claims8
An apparatus for automatically controlling the pick-up arm set-down diameter in a record player comprising a turntable having a surface on which a record may be placed and an axis perpendicular to said surface about which axis the turntable is rotatable;
- at least one sensing pin so connected to the turntable as to be disposed in a raised position projecting above said surface in the absence of a record, having a diameter less than a first given diameter, on the turntable, and in a depressed position in response to placement of a record greater than said given diameter on the turntable;
- a tone-arm assembly, comprising a tone-arm, means for mounting the tone-arm for pivotal motion about an axis parallel to the turntable axis, and a stop bracket for limiting pivoting of the arm toward the axis of the turntable;
- and abutment means for engaging said stop bracket at one of a plurality of bracket positions to limit said pivoting, each bracket position corresponding to a set-down diameter of the tone-arm corresponding to a pin position, wherein
- said abutment means comprises an abutment plate movable between at least a first locked position and a second locked position closer to said turntable axis than said first locked position, each locked position corresponding to a set-down diameter, said abutment plate comprisng at least first and second abutment members;
- and
- said apparatus further comprises means responsive to the position of said sensing pin for engaging at least one of said abutment members when the abutment plate position corresponds to a set-down diameter different from that corresponding to the sensing pin position, and for moving said abutment plate toward the locked position corresponding to that pin position, said position responsive means comprising a first abutment element for engaging said first abutment member so as to move said first member toward the turntable axis thereby moving said abutment plate from said first position toward said second position, and a second abutment element for engaging said second abutment member so as to move said second member away from the turntable axis thereby moving said plate from said second plate position toward said first position;
- and means for releasably locking said abutment plate in each locked position.
Dependencies are inferred from the claim text.