An electronic watch comprising a motor for converting electrical energy into mechanical rotational movement, an actuating means operable from the outside of the casing of the watch, and an arbor means for the hand of the watch. A gear train couples the motor to the arbor means and a cam means is operatively connected to the actuation means and the watch hands. The cam means are controlled by the operation of the actuation means for setting at least one of the hands of the watch to a reference position whereby the watch may be set by merely operating the actuation means.
A gear train mechanism stop device is used in a timepiece having clock signal producing IC, a stepping motor for generating a given rotational movement in response to a clock signal produced from the IC, at least hour and minute hands, and a gear train mechanism for transmitting the rotational movement from the motor to hands so as to make the hands move in a given movement, which is selectively engaged with a specified gear in the gear train mechanism so as to stop rotation of the specified gear. The device comprises an engaging member movable between an engaged position at which the member is engaged with the specified gear in the gear train mechanism in the axial direction of the specified gear so as to stop rotation of the specified gear, and a disengaged position at which the member is disengaged from the specified gear and allows the specified gear to rotate so as to allow rotational movement transmission from the motor to the hands, and an operation member for selectively moving the engaging member between the engaged and disengaged positions, wherein the specified gear is made of a synthetic resin.
This invention relates to a battery powered electronic wristwatch having a time changing device accommodated in a recess in the base plate of the watch which device operatively is connected to the adjustment shaft manipulatable externally of the watch casing to alter the position of the hands of the watch. The time changing device includes a pivotable setting lever which cooperates with the adjustment shaft and a spring for controlling the movement of the setting lever. A fixed body portion of the spring has a portion of its periphery shaped so as to conform to a peripheral portion of a base recess for accommodating the watch battery.
A hand-return mechanism for an electronic timepiece wherein at least one hand is returned to a predetermined position and the motor rotating same is correspondingly adjusted. The timepiece includes a display hand mechanically coupled to a positionable gear, the rotational position of the gear determining the rotary position of the hand. An oscillator circuit produces a high frequency time standard signal and a divider circuit produces an alternating polarity pulse of a predetermined low frequency in response to the high frequency time standard signal. An electro-mechanical converter is adapted to rotate the gear by means of a rotor in response to the period of the alternating polarity pulse applied thereto. A manually operated reset mechanism is adapted to be displaced from a rest position to a reset position, the reset mechanism being mechanically coupled to the gear and electrically coupled to the divider circuit, the resetting mechanism effecting a mechanical positioning of said gear and rotor to a predetermined position and a resetting of the divider circuit to stop and then restart the electro-mechanical converter in coordination with the position of said rotor upon the return of the manually operated reset mechanism to a rest position which releases the gear.
