专利名称：Printer system
发明人：Gordon B. Barrus,Leo J. Emenaker,Raymond
F. Melissa
申请号：US05/495830申请日：19740808公开号：US03941051A公开日：19760302
摘要：A dot matrix printer system utilizes a reciprocating shuttle having a plurality ofhammer elements and externally energized hammer controls mounted with thehammers on the shuttle. Each hammer scans a number of dot printing positions within adot matrix line, and is energized at a high repetition rate during movement to imprintserially the dot patterns in that line for several successive characters. The paper is thenadvanced and the next dot matrix line is printed in the reverse direction. The shuttlemechanism forms a part of a dynamically balanced system, being in one example driven ina trapezoidal motion from a cam system that also engages an oppositely movingcounterweight system. A highly reliable fast acting hammer bank comprises an array ofindividual spring hammer elements and associated magnetic actuators, the hammerelements normally being magnetically biased to a retract position by a permanentmagnet. The magnetic field is neutralized to permit hammer flight with controlledvelocity for imprinting, with hammer return being automatically achieved by the magneticbias. The system is amenable to generation of a wide variety of dot matrices and arbitraryprinting patterns, and provides uniform and well defined characters through a substantialnumber of copies, but nevertheless operates reliably and at high speed with a low cost
mechanism that does not require adjustment.
申请人：PRINTRONIX, INC.
代理机构：Fraser and Bogucki
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