Apparatus for preventing oblique movement of a pickup for a record player during its ascending or descending movement

Claim 2

Apparatus of a record player for reproducing sound from a disc record, comprising a tone arm pivotally supported and provided with a stylus positioned over the disc record, said stylus being movable toward and away from the disc record in a vertical direction and further movable in another direction perpendicular to said vertical direction, a first member connected to said tone arm and movable therewith, and a second member located in a confronting relation to the first member, one of said first and second members being a magnet and the other of said first and second members being of a magnetic material, said first and second members being magnetically attracted to, and in contact with, each other when the stylus is moving toward and away from said disc record but out of contact when said stylus is positioned on said disc record, wherein the stylus is prevented from moving in said another direction by the friction force between said members generated by said magnetic attraction.

Claim 3

Apparatus as claimed in claim 1 further comprising a tone arm guiding member permitting the stylus to move to and away from the disc record, said second member being fixed to said tone arm guiding member.

Claim 4

Apparatus as claimed in claim 1 further comprising a pivot shaft pivotably supporting said tone arm, said first member being fixed to said pivot shaft, thus being connected in turn to said tone arm.

Claim 5

Apparatus as claimed in claim 1 further comprising a spring member urging one of said first and second members toward the other of said first and second members.

Claim 6

Apparatus as claimed in claim 1 wherein one of said first and second members is adjustable in relative position with respect to the other of said first and second members.

Claim 7

Apparatus as claimed in claim 1 wherein one of said first and second members comprises a support arm, and a friction member movably supported by said support arm and resiliently urged to the other of said first and second members.

Claim 8

Apparatus as claimed in claim 1 wherein said magnet is an electromagnet.

Claim 9

In a record player for reproducing sound from a disc record including a tone arm pivotally supported and provided with a stylus positioned over a disc record, said stylus being movable toward and away from the disc record in both a vertical and horizontal direction and an inside force cancelling means for equalizing the horizontal force exerted on the stylus as said stylus moves from the outside periphery to the inner periphery of said disc record, said force cancelling means tending to move said tone arm away from the rotational center of said disc record when said stylus is being moved toward and away from said disc record, the improvement comprising means for preventing said stylus from moving in said horizontal direction when said stylus is moving vertically toward and away from the disc record, said means comprising a tone arm guiding member permitting the stylus to move toward and away from the disc record, a friction plate mounted on said tone arm guiding member, means for moving said tone arm guiding member and said friction plate vertically with respect to said disc record to thereby move the stylus toward and away from the disc record, a spring member fixedly secured to said record player, said spring member frictionally engaging said friction plate when said stylus is moving toward and away from said disc record, said stylus being prevented from moving in said horizontal direction by the frictional engagement.

Claim 10

In a record player for reproducing sound from a disc record including a tone arm pivotally supported and provided with a stylus positioned over a disc record, said stylus being movable toward and away from the disc record in both a vertical and horizontal direction and an inside force cancelling means for equalizing the horizontal force exerted on the stylus as said stylus moves from the outside periphery to the inner periphery of said disc record, said force cancelling means tending to move said tone arm away from the rotational center of said disc record when said stylus is being moved toward and away from said disc record, the improvement comprising means for preventing said stylus from moving in said horizontal direction when said stylus is moving vertically toward and away from the disc record, said means comprising a tone arm guiding member permitting the stylus to move toward and away from the disc record, a friction plate mounted on said tone arm guiding member, means for moving said tone arm guiding member and said friction plate vertically with respect to said disc record to thereby move the stylus toward and away from the disc record, a spring member fixedly secured to said record player, said spring member frictionally engaging said friction plate when said stylus is moving toward and away from said disc record, said stylus being prevented from moving in said horizontal direction by the frictional engagement.

Claim 11

The apparatus of claim 8 further comprising a pivot shaft pivotally supporting said tone arm, said spring member being fixed to said pivot shaft and accordingly being connected in turn to said tone arm.

Claim 12

The apparatus of claim 8 wherein said spring member and friction plate are aDjustable in relative position with respect to one another.

Claim 13

In a record player for reproducing sound from a disc record including a tone arm pivotally supported and provided with a stylus positioned over a disc record, said stylus being movable toward and away from the disc record in both a vertical and horizontal direction, the improvement comprising: means for preventing said stylus from moving in said horizontal direction when said stylus is moving vertically toward and away from the disc record, said means comprising a tone arm guiding member permitting the stylus to move toward and away from the disc record, a friction plate mounted on said tone arm guiding member, means for moving said tone arm guiding member and said friction plate vertically with respect to said disc record to thereby move the stylus toward and away from the disc record, a spring member fixedly secured to said record player, said spring member frictionally engaging said friction plate when said stylus is moving toward and away from said disc record, said stylus being prevented from moving in said horizontal direction by said frictional engagement.

Claim 14

In a record player for reproducing sound from a disc record including a tone arm pivotally supported and provided with a stylus positioned over a disc record, said stylus being movable toward and away from the disc record in both a vertical and horizontal direction, the improvement comprising: means for preventing said stylus from moving in said horizontal direction when said stylus is moving vertically toward and away from the disc record, said means comprising a tone arm guiding member permitting the stylus to move toward and away from the disc record, a friction plate mounted on said tone arm guiding member, means for moving said tone arm guiding member and said friction plate vertically with respect to said disc record to thereby move the stylus toward and away from the disc record, a spring member fixedly secured to said record player, said spring member frictionally engaging said friction plate when said stylus is moving toward and away from said disc record, said stylus being prevented from moving in said horizontal direction by said frictional engagement.