Printing – Selective or progressive – Bed and platen machines
Patent
1974-08-08
1976-03-02
Skogquist, Harland S.
Printing
Selective or progressive
Bed and platen machines
197 1R, B41J 508
Patent
active
039410510
ABSTRACT:
A dot matrix printer system utilizes a reciprocating shuttle having a plurality of hammer elements and externally energized hammer controls mounted with the hammers on the shuttle. Each hammer scans a number of dot printing positions within a dot matrix line, and is energized at a high repetition rate during movement to imprint serially the dot patterns in that line for several successive characters. The paper is then advanced and the next dot matrix line is printed in the reverse direction. The shuttle mechanism forms a part of a dynamically balanced system, being in one example driven in a trapezoidal motion from a cam system that also engages an oppositely moving counterweight system. A highly reliable fast acting hammer bank comprises an array of individual spring hammer elements and associated magnetic actuators, the hammer elements normally being magnetically biased to a retract position by a permanent magnet. The magnetic field is neutralized to permit hammer flight with controlled velocity for imprinting, with hammer return being automatically achieved by the magnetic bias. The system is amenable to generation of a wide variety of dot matrices and arbitrary printing patterns, and provides uniform and well defined characters through a substantial number of copies, but nevertheless operates reliably and at high speed with a low cost mechanism that does not require adjustment.
REFERENCES:
patent: 3280738 (1966-10-01), Goodrich
patent: 3420352 (1969-01-01), Moran
patent: 3768403 (1973-10-01), Rose
patent: 3782278 (1974-01-01), Barnett
patent: 3810195 (1974-05-01), Kilroy
Barrus Gordon B.
Emenaker Leo J.
Melissa Raymond F.
Printronix, Inc.
Skogquist Harland S.
LandOfFree
Printer system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Printer system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printer system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1271475