Print head for a dot matrix printer

摘要

A print head wherein a magnetic member is attracted by a permanent magnet to bend a resilient member to thereby store energy in the resilient member. A magnetic force of the permanent magnet is adapted to be cancelled by an excitation of an electromagnet to release the magnetic member thereby enabling the utilization of the energy stored in the resilient member as an impact force for printing. A rear end portion of the resilient member is pressed in a direction opposite to a direction in which the impact force is applied by a pressing member and is adapted to pivot with a certain degree of freedom. The pivoting fulcrum for the magnetic member is defined on a magnetic pole surface of the permanent magnet. At least one of the contact portions of the pressing member or the resilient member is provided with a curved surface in an engagement area of the pressing member and resilient member, and a distance between the contact point and the pivoting fulcrum is variable in accordance with the pivoting movement of the magnetic member so that it is possible to provide a control whereby the impact force is constant.