Schalteinrichtung zur Erzeugung einer Schrittbewegung eines Gliedes

摘要

A high-speed indexing mechanism, for moving a member to a printing position, which includes an indexing shaft on which are mounted an indexing drive wheel and a clutch member operated by a cam follower arm. A cam member rotates the cam follower arm to drive the indexing shaft, which moves the member to a printing position by means of the indexing drive wheel. The clutch allows the indexing shaft to be rotated in one direction by the cam follower arm. A second clutch member is mounted on the indexing shaft to provide a drag on the indexing shaft. To provide a more accurate indexing mechanism, a ratchet wheel is mounted on the indexing shaft to control the length of rotation of the indexing shaft by the cam follower arm. An electromagnet operates to latch the cam follower arm, thus controlling the operation of the indexing mechanism.