The present invention concerns a printing device more particularly for a chronocomparator, i.e. an apparatus for determining the instantaneous rate of a watch.
Known printing devices of this kind make use of an electromagnet for providing an angular movement and present therefore a number of disadvantages. In particular, the inductance of those devices is relatively important and this results in a high electric time constant. Furthermore, they have a poor ratio of torque to moment of inertia and of torque to volume of the printing device, so that they are not economically satisfactory and are limited in their performance.
USPTO Backgrounds
USPTO Backgrounds