US 4,175,373 AGranted

Digital clock

AssigneeRhythm Watch Co., Ltd.

InventorsKazuo Miyamoto, Isao Suzuki, Hideo Koide

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Abstract

A digital display clock including a one-minute indicating wheel, a ten-minute indicating wheel and an hour indicating wheel which are driven by intermittent and segmental rotations through separately provided Geneva-gear mechanisms for each individual indicating section, a driving system arranged in the back of digital clock, so that the clock is able to provide a wide and effective display area in front of the clock and an excellent design for a 24 hour display digital clock with diversity.

Claims10

Dependent claims

A digital display clock comprising:

a driving section including a means for generating time signals which produce rotating driving power;
an indicating display including a one-minute indicating wheel, a ten-minute indicating wheel, and an hour indicating wheel which receive rotation driving power from said driving section and which are mounted on an indicating wheel shaft to be driven intermittently, said one-minute indicating wheel, said ten-minute indicating wheel and said hour indicating wheel being mounted on an indicating wheel shaft;
a (frist) first Geneva-gear mechanism which transmits the rotation driving power through said driving section for an intermittent driving power at intervals of one minute to said indicating wheel shaft, and, one-minute indicating wheel rotating with said indicating wheel shaft;
a driving shaft (separately secured from) laterally mounted with respect to said indicating wheel shaft, a single gear on said driving shaft, (and simultaneously rotated with) said ten-minute indicating wheel being freely rotatable on said indicating wheel shaft and being engaged by said gear for rotation;
a second Geneva-gear mechanism (which transmits the intermittent rotation of) connected to said one-minute indicating wheel and to said driving shaft (and) to transmit intermittent motion to said ten-minute indicating wheel through said gear as an intermittent driving power at intervals of ten minutes;
and
a third Geneva-gear mechanism (which transmits the intermittent rotation of) connected between said driving shaft (to) and said hour indicating wheel for an intermittent driving power to said hour indicating wheel at intervals of one hour, each of said Geneva-gear mechanisms being positioned at the ends of said driving shaft and only said single gear being positioned intermediate the ends of said indicating display so that said indicating display is substantially uninterrupted by lateral spacing.

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Dependencies are inferred from the claim text.

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Abstract

A digital display clock comprising:

a driving section including a means for generating time signals which produce rotating driving power;
an indicating display including a one-minute indicating wheel, a ten-minute indicating wheel, and an hour indicating wheel which receive rotation driving power from said driving section and which are mounted on an indicating wheel shaft to be driven intermittently, said one-minute indicating wheel, said ten-minute indicating wheel and said hour indicating wheel being mounted on an indicating wheel shaft;
a (frist) first Geneva-gear mechanism which transmits the rotation driving power through said driving section for an intermittent driving power at intervals of one minute to said indicating wheel shaft, and, one-minute indicating wheel rotating with said indicating wheel shaft;
a driving shaft (separately secured from) laterally mounted with respect to said indicating wheel shaft, a single gear on said driving shaft, (and simultaneously rotated with) said ten-minute indicating wheel being freely rotatable on said indicating wheel shaft and being engaged by said gear for rotation;
a second Geneva-gear mechanism (which transmits the intermittent rotation of) connected to said one-minute indicating wheel and to said driving shaft (and) to transmit intermittent motion to said ten-minute indicating wheel through said gear as an intermittent driving power at intervals of ten minutes;
and
a third Geneva-gear mechanism (which transmits the intermittent rotation of) connected between said driving shaft (to) and said hour indicating wheel for an intermittent driving power to said hour indicating wheel at intervals of one hour, each of said Geneva-gear mechanisms being positioned at the ends of said driving shaft and only said single gear being positioned intermediate the ends of said indicating display so that said indicating display is substantially uninterrupted by lateral spacing.

4 more elements