Mechanism for supporting pickup arm in disc record player of linear tracking arm type
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorMotoi Iyeta
Life of this patent
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Abstract
A mechanism for supporting a pickup arm in a linear tracking arm type disc record player comprising an upper guide rail having a groove, a lower guide rail extending parallel to the upper guide rail, and a pickup-arm supporting movable frame having first rollers engaging in the groove of the upper guide rail for suspension of the movable frame therefrom and having second rollers contacting the lower guide rail to allow the movable supporting frame to make smooth linear travel on this lower guide rail without unwanted pivotal movement. This arrangement insures smooth linear tracking of the pickup arm with no rattling-type travel and eliminates the need for highly trained skill in assembling the whole mechanism.
Claims5
A pickup arm supporting mechanism for a linear tracking arm type disc record player comprising:
- a first horizontally disposed guide rail and a second vertically disposed guide rail spaced vertically below said first guide rail with both said guide rails extending parallel to each other,
- a pickup arm supporting frame, a pickup arm, means mounting said pickup arm on said supporting frame for vertical as well as horizontal swinging movements,
- said pickup arm supporting frame having an upper portion and a lower portion with said means mounting said pickup arm disposed between said upper and lower portions, said upper portion having horizontally extending shaft means and first roller means mounted for free rotation about a horizontal axis on said horizontal shaft means, said first roller means engaging said first guide rail for movement therealong with said supporting frame suspended from said first guide rail on said first roller means about a horizontal pivot axis said lower portion having vertically extending shaft means and second roller means mounted for free rotation about a vertical axis on said vertical shaft means, and engaging said second guide rail for movement therealong, the line of engagement of the second guide rail and second roller means being offset from the vertical plane containing the line of engagement of said first roller means with said first guide rail, said supporting frame and pickup arm mounted thereon having a weight disposition relative to said first roller means such that a moment is created about the point of engagement of said first roller means with said first guide rail tending to urge said lower portion of said supporting frame toward said second guide rail to maintain contact between said second guide rail and said second roller means, and said second roller means engaging said second guide rail so that a horizontal force applied to said arm in a direction away from said frame urges said second roller means against said second guide rail.
Dependencies are inferred from the claim text.