Low friction phonograph tone arm traverse
AssigneeU.S. Philips Corporation
InventorHermanus F. Einhaus
Life of this patent
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Abstract
The tone arm (13) of a record player is carried by a carriage (14) which is movable along a motor-driven rotating spindle (6) extending tangentially with respect to the axis of the turntable (10). For supporting it on the spindle the carriage has two bearings (15 and 16) which are spaced from each other in the axial direction of the spindle and each of which has a bearing surface which engages the spindle at only the upper part of the circumference of the spindle. This arrangement permits slight pivotal movements of the carriage relative the spindle about axes transverse to the spindle to compensate for the forces which occur during accelerations of the tone arm, as when the stylus enters the lead-out groove. The tone arm is connected to a part (20) of the carriage which is made of a vibration-damping material.
Claims16
A record player comprising a turntable arranged for rotation about a vertical axis, a horizontal rotatable spindle which extends tangentially with respect to said vertical axis and has a circumferential surface, a motor for rotating the spindle during operation of the record player, and a carriage which is movable axially along the spindle and which carries a tone arm having a stylus end extending in a horizontal direction from the carriage transversely to said spindle,
- wherein said carriage comprises two bearings for supporting the carriage on the spindle during normal operation, said bearings being spaced from each other in the axial direction of the spindle and each having a bearing surface which is arranged to engage the spindle at part of the upper half of the circumferential surface only, thereby allowing the carriage to twist about the spindle upon rapid acceleration of said stylus end, and
- the carriage comprises a support made of a vibration-damping material to which the tone arm is secured.
A record player comprising a turntable arranged for rotation about a vertical axis, a horizontal rotatable spindle which extends tangentially with respect to said vertical axis and has a circumferential surface, a motor for rotating the spindle during operation of the record player, a carriage which is movable axially along the spindle and which carries a tone arm having a stylus end extending in a horizontal direction from the carriage transversely to said spindle,
- and a dust cover which can be pivoted between open and closed positions,
- wherein said carriage comprises two bearings for supporting the carriage on the spindle during normal operation, said bearings being spaced from each other in the axial direction of the spindle and each having a bearing surface which is arranged to engage the spindle at part of the upper half of the circumferential surface only, each bearing being open at its underside, thereby allowing the carriage to twist about the spindle upon rapid acceleration of said stylus end, and
- the player comprises means for lifting the carriage off the spindle upon opening the cover.
Dependencies are inferred from the claim text.