Striker device for printers.

摘要

A striker device (10) for use in printers comprises a platen roller (11), a character-carrying disc (28) and a print hammer (16) for striking a character (13) of the disc against the roller. The print hammer is actuated by an armature (24) which is movable in an impact direction (14) with the hammer (16) by virtue of electromagnetic excitation of a stator body (22). The device includes strike-silencing means (31) comprising sliding guide surfaces (32,33) between the print hammer and the armature, which ensure freedom of movement for the armature with respect to the hammer in the impact sense and direction (14), and a ring (36) of elastomeric material which is interposed between the armature and the print hammer and which transmits the kinetic energy of the armature to the print hammer with a delay. Particular ratios between the masses 'Mh' and 'Ma' of the hammer and the armature and between the levels of hardness 'Kr' and 'Kp' of the elastomeric ring and the roller provide a single but prolonged strike on the part of the print hammer.