Abstract: Upon excitation of the electromagnet, a clapper armature is pulled into an operating gap, being increasingly additionally attracted by the pole of an electromagnet yoke leg.The motional plane of the clapper armature extends perpendicularly to the plane of the magnetic flux of the yoke structure of the electromagnet.

Abstract: The continuous type belt is arranged round two rollers, one of which is driven. One straight section of the type belt contacts over its entire length the support designed as a platen.In order to avoid groove on the platen caused by the rotating type belt, and to achieve a distribution of other kinds of wear of the platen over its circumference, a gear motor causes the platen to rotate very slowly (approximately 1 revolution in 72 hours).The platen can also be rotated without a gear motor. For this purpose, the longitudinal axis of the platen is slightly inclined relative to the edge of the type belt. This inclination effects a small movement component in the direction of the platen circumference while the type belt slides along the lateral surface of the platen, said component causing a slow revolution of the platen.