The invention relates to a step motor particularly for an electronic timepiece, comprising a stator whose two free ends constitute two pole pieces delimiting therebetween an air-gap in which is accommodated the rotor. Each pole piece is provided with a recess of cylindrical shape so that the axis of each cylinder is parallel with the axis of rotation Ar of the rotor. The two axes of the said cylinders are shifted from one another by a value comprised between 80.mu. and 200.mu. in a direction per...

An electric timepiece having an electro-mechanical transducer for driving a mechanical time display arrangement intermittently in response to a pulse signal applied to the transducer from an electric driving circuit. A regulating device is provided having an externally and coordinately operated mechanical control member and reset switch adapted to apply a pulse of a polarity suitable to energize the transducer one second after the reset switch is returned to its normal position from its resettin...

A single phase stepping motor, particularly for clocks, with a rotor having several pole teeth and a stator, the latter being made of two stator parts connected with one another via a bridge part, the latter carrying the excitation winding, of which each stator part on its free end has an equal or smaller number (in comparison to the rotor pole number) of stator pole teeth as well as a passage opening for the rotor shaft, the stator pole teeth being directed towards the face sides of the rotor. ...

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 po...

A magnetic clock comprises an inner revolvable magnetic member and an outer revolvable magnetic member, each being of generally hour glassed shaped and being arranged concentrically with respect to each other. An hour glassed shaped bearing is positioned concentrically between and exerts a repulsive force on the inner and outer members. The inner and outer revolvable magnetic members each have a plurality of circumferentially spaced apart peripheral elements integrally formed therewith which pro...

A step motor particularly suited for use in electronic timepieces wherein the induced current generated by the stepping of the rotor is utilized to minimize the power consumption thereof. The step motor includes a permanent magnet rotor adapted to be stepped through a specific angle, at least two stator poles surrounding same, and an electromagnetic core coupled to the stator poles for providing at least first and second magnetic orientation to said stator poles in order to step said rotor throu...

In a motor having a rotor which is a permanent magnet, the rotor is in the form of a cylinder from which portions have been cut forming surfaces symmetrical with respect to the axis of the cylinder. The moment of inertia of the rotor is thereby reduced so that response to a magnetic impulse is more rapid. Further, the plane of magnetism is asymmetric with respect to the plane bisecting the cylindrical surfaces of the rotor, thereby providing for greater thrust under the effect of the yoke and in...

An electric clock with an electronic unit which generates a pulse train of constant frequency, and with a single-phase stepper motor to which this pulse train is fed comprising a stator with a field coil and n poles arranged in one plane. The motor has an m - pole permanent magnet armature. The elements of the hand mechanism are arranged between two plates.

A feedback circuit between the output and input terminals of a complementary-symmetry, metal-oxide-semiconductor (CMOS) circuit, such as an inverter circuit, quiescently biases the circuit at a point on its transfer characteristic such that a slight additional change in voltage level will cause the circuit to change state. Input signal is applied to the input terminal through a coupling element such as a capacitor. When this input signal starts to decrease after reaching its peak voltage value i...

A micro motor for a timepiece comprises a curved magnetic core, a coil winding wound on the magnetic core, a stator connected to the magnetic core to define therewith a closed magnetic flux path and having an opening therein in which a rotor is rotatably disposed. The stator comprises a pair of stator pieces each connected at one end to a respective end portion of the curved magnetic core and the stator pieces have curved portions extending at least partly along the curvature of said curved magn...