Actuator mechanism for a printer or the like using dual magnets

摘要

An actuator element having a fixed end and a magnetizable deflection end is releasably held in spring loaded condition at a non-operative position by an electromagnetic operator. In the preferred form, the actuator element is an elastic beam of magnetically permeable material. The operator comprises first and second permanent magnets for generating separate magnetic fields of the same polarity proximate the magnetizable deflection end of the actuator element and a magnetic core combined with the permanent magnets to form at least first and second magnetic holding circuits with the deflection end of the actuator element through a common return path. A winding on the return path of the core when energized generates flux in opposition to the flux from the permanent magnets to release the actuator element for movement to an operative position. Upon de-energization of the winding, the deflection end of the actuator element is retracted and held by the permanent magnets in spring loaded condition.