An electrical swing mechanism having a drive device with a rotor and a stator. The drive device carries out self-returning reciprocation with a rotation angle of the rotor. An intermittent drive transmission device transmits the rotation of the drive device to a utilization mechanism. An electric source unit is used for exciting the stator with a pulse current. The drive device has a rotor which is magnetized so that the same poles are formed on a diametral line intersecting the rotation axis thereof and a magnetization angle between different poles is 2 .alpha., and a stator whose magnetic pole angle .beta. is larger than said magnetization angle 2 .alpha.. The intermittent drive transmission device comprises a cut disk member having a ratchet pawl and is reciprocated by the drive device. A ratchet plate member having ratchet teeth are moved one pitch by one pitch by the ratchet pawl. The reset mechanism comprises a release lever for disengaging the ratchet pawl from the ratchet teeth and a correcting gear for turning the release lever.
In an electromagnetic actuator wherein a rotatable rotor and at least one magnetomotive force source are integrally incorporated through a magnetic path, magnets 5-1 and 5-2 magnetized with opposite polarities are provided on a part of the peripheral surface of the rotor 4. Three pole pieces 12, 13 and 14 are provided on the peripheral edge of an opening in which the rotor 4 is provided. Connecting paths 15, 16 and 18 are provided for each pair of adjacent pole pieces.
Regulating element for wristwatch comprising: a balance, a magnetic return member for returning the balance to at least one stable equilibrium position, and an escapement for maintaining the oscillation of the balance around the equilibrium position.
