The present invention relates to the displacement of a workpiece in a given direction to a good accuracy. According to the invention the friction between the workpiece and a sliding surface on which the workpiece is resting is overcome by a mechanical impulse. Preferably, the mechanical impulse is accomplished...http://www.google.fr/patents/US3957162?utm_source=gb-gplus-shareBrevet US3957162 - Method and device for displacement of a workpiece
