Counter mechanism with cam null positioning - has additional parts on counter roller attached to tensioning blocks acting transiently on drive and spring

摘要

The counter mechanism with cam null positioning avoides the dead centre positions of null position levers and cam profiles. The mechanism uses additional parts on only one counter location, pref. on the lowest counter roller (3) or on its drive elements. The additional parts rotate the lowest counter away from its dead centre position. The roller (3) has attached to it tensioning elements (24, 25) at defined positions which act transiently on a drive element (26) and associated spring as the roller is rotated. This ensures that each roller (3, 4, 5) is moved slightly away from its null position at all times.