US 4,907,210 AGranted

Train wheel of electronic timepiece

AssigneeSeiko Instruments Inc.

InventorsMamoru Sato, Mamoru Watanabe

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Abstract

A train wheel of an electronic timepiece having more than two motors which drive hand wheels through individual train wheels includes a guide pipe driven and fixed in a bottom plate in the timepiece. The first hand wheel driven by the rotor of the first motor through the first train wheel has a central shaft as its rotational axis. The central shaft of the first hand wheel is inserted into the guide pipe so as to be guided and supported by the inner surface of the guide pipe. The second hand wheel has a central pipe as its rotational axis. The central pipe of the second hand wheel has the guide pipe inserted therein so as to be guided and supported by the outer surface of the guide pipe. Whereby the hand wheels do not come into contact with each other with result that the drive force of one of the hand wheels is not transmitted to the other hand wheel.

Claims6

Dependent claims

A train wheel of an electronic timepiece comprising:

a bottom plate;
a first rotor provided on one side of the bottom plate for driving a first hand wheel;
a first train wheel provided on said one side of the bottom plate and rotationally driven by the first rotor for transmitting the driving force of the first rotor to the first hand wheel to rotate the first hand wheel;
the first hand wheel being positioned on said one side of the bottom plate and having a central shaft;
a first hand provided on the central shaft for indicating time information;
a second rotor provided on said one side of the bottom plate for driving a second hand wheel;
a second train wheel provided on said one side of the bottom plate and independently rotationally driven by the second rotor for transmitting the driving force of the second rotor to the second hand wheel to rotate the second hand wheel and having a wheel provided through the bottom plate for transmitting the driving force to the other side of the bottom plate;
the second hand wheel being positioned on said other side of the bottom plate and having a central pipe;
a second hand provided on the central pipe for indicating time information;
a guide pipe extending through the bottom plate;
the central shaft of the first hand wheel being rotatably inserted into the guide pipe from said one side of the bottom plate so as to be guided and supported by the inner surface of the guide pipe;
and
the central pipe of the second hand being rotatably inserted over the guide pipe from said other side of the bottom plate so as to be guided and supported by the outer surface of the guide pipe.

10 more elements

Dependencies are inferred from the claim text.