Motion transformer
AssigneeKabushiki Kaisha Suwa Seikosha
InventorsKenichi Koike, Yoshikazu Kawamura
Life of this patent
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Abstract
A rotary motion transformer particularly adapted to provide continuous rotary motion to a driven member in response to an intermittently rotated driving member is provided. The driven member and the driving member are oppositely poled magnetic permeable members disposed proximate to each other to provide a flux field therebetween. The driven rotary member is disposed in a viscous damping reservoir, the viscous damping reservoir effecting smooth and continuous rotation of the driven member.
Claims5
In an electronic timepiece having a step motor for intermittently stepping a gear train including a plurality of intermittently driven gears, the improvement comprising a first permanent magnet associated with at least one gear, said permanent magnet being intermittently rotated by said gear associated therewith, and clock hand means including a permanent magnet disposed to define a flux field between said gear associated magnet and said clock hand magnet, and viscous damping means surrounding said clock hand magnet to effect a continuous rotation of said clock hand means in response to the intermittent rotation of said gear train.
In an electronic timepiece having a step motor, the improvement comprising step motor means including a rotor and a magnetic permeable rotatable driving member having two opposite polarity poles, said step motor intermittently rotating said magnetic permeable rotatable driving member in response to a stepping of the rotor thereof, and clock hand means including a magnetic permeable rotatable driven member having two opposite polarity poles, said driven member and driving member being positionally disposed to define a flux field therebetween and rotate about the same axis;
- and a viscous damping means, said driven member portion of said clock hand means being rotatably disposed in said viscous damping means, said driven member and hence said clock hand means being continuously rotated in response to the intermittent rotation of said driving member.
Dependencies are inferred from the claim text.