Print drum mounting means and intermittent drive means therefor

Claim 1

In a printing system comprising: a torsion shaft; a printing drum attached to said shaft at a medial portion thereof; means for continuously rotating said shaft at a substantially constant speed in one direction during successive printing cycles past a print point; oscillator means connected to said shaft ends for oscillating said shaft to cause said drum to effectively dwell one or more times for each revolution of said drum; said shaft having a hardened external contacting surface at said medial portion with a layer of copper approximately 0.0005 inch thick adhering to said external surface; said drum having a hardened internal contacting surface; the external contacting surface of said shaft with the layer of copper thereon and the internal contacting surface of said drum being dimensioned to provide an interference fit therebetween when the drum is assembled on Said shaft; and said drum being shrink-fitted on said shaft.