Fast-reciprocating ductor roll

Details Fast-reciprocating ductor roll Fast-reciprocating ductor roll

B - Operations, Transporting

41

F

B41F 31/14 (2006.01)

Patent

CA 2047126

An offset printing apparatus rotates the plate cylinder steadily with a minimum of torsional interference caused by impact of the reciprocating doctor roll with the vibrator roll. The doctor roll is reciprocated at a rapid rate to impart a rapid succession of torsional shocks to the vibrator roll and thereby to urge the gear train toward a steady-state condition wherein a level of torsional loading is maintained without substantial change in response to reciprocation of the doctor roll.

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