Quiet impact printer mechanism
AssigneeSmith Corona Corporation
InventorsStephen M. Pawlak, Roger J. Rimbey, Mark D. Rodee
Life of this patent
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Abstract
An improved quiet impact printer mechanism for use with a typewriter or printer which includes a print hammer having a high effective mass at the print point for impacting a character pad against an ink ribbon, paper and a platen at a relatively low velocity. The pinter mechanism drive means includes a cam driven by a low torque reversible motor for moving a cam follower. The cam follower is coupled to the hammer by means of a pin and moves the hammer towards the platen. The cam may also cause movement of the hammer toward the platen under a predetermined series of controlled velocities.
Claims18
An impact printer mechanism for driving a selected character pad of a print element to print a character on a sheet medium supported by a platen, the mechanism comprising:
- a print hammer including a mass weight which supports a mounted anvil thereon, said mass weight includes a plate having a surface projecting a plurality of letter spaces in a plane parallel to said platen and includes having a maximum dimension in a direction perpendicular to said platen substantially behind said anvil;
- and
- a drive means comprising a rotary cam operatively connected to said print hammer for actuating said print hammer to cause printing, said drive means including cam controlled means for imparting impact velocity to said print hammer.
Dependencies are inferred from the claim text.