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US 4,253,174 AGranted
Electronic timepiece
AssigneeEbauches S.A.
InventorAli Schneiter
Life of this patent
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AssigneeEbauches S.A.
InventorAli Schneiter
Estimating the term…
A time resetting operation in an electronic timepiece requires blocking of the stepping motor 1, and block of the mechanical type is avoided by the invention. A STOP switch 10 actuated by a time resetting stem of the timepiece sets to state "1" a flip-flop 11 which blocks gates 12 and 13 for controlling the passage of the pulses which drive the motor 1 through a feed circuit 2. The circuit 2 then passes a continuous current in the same direction as the last drive pulse. Thus, triggering of the continuous current leaves the position of the rotor unchanged. A counter 14 counts 1-second pulses and then resets the flip-flop 11, which causes the motor to resume normal operation. This avoids excessive discharging of the battery of the electronic timepiece if the user forgets to return the stem to its initial position after a time resetting operation.
An electronic timepiece comprising a time base, a stepping motor actuated by pulses supplied by the time base, display means driven by the stepping motor, mechanical time resetting means, and a blocking circuit which is responsive to actuation of the time resetting means to apply continuous current to the motor so as to block the motor electrically during the time setting operation.
Dependencies are inferred from the claim text.