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Print Hammer Energy Control Based On the Print Character

IP.com Disclosure Number: IPCOM000101336D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Dayger, DA: AUTHOR

Abstract

The energy imparted to a print hammer is modified according to stored values associated with the character being printed. The hammer timing of a print hammer with modified energy is accomplished by modification of the conventionally pre-calculated hammer fire tables.

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This is the abbreviated version, containing approximately 65% of the total text.

Print Hammer Energy Control Based On the Print Character

       The energy imparted to a print hammer is modified
according to stored values associated with the character being
printed.  The hammer timing of a print hammer with modified energy is
accomplished by modification of the conventionally pre-calculated
hammer fire tables.

      Tables of hammer pulse width and the associated hammer flight
time, for the various print hammer energy levels desired, are
constructed and stored for use during hammer fire pre-calculation.
These tables, herein collectively referred to as the hammer energy
tables, contain only those entries associated with hammer energy
levels that are different from the nominal hammer energy level that
is desired for the most common print characters.

      The hammer energy desired for a particular print character is
stored as an index value.  In a typical embodiment, an index value of
zero indicates that the nominal hammer energy is desired, while a
non-zero index value indicates that the hammer energy is to be
determined by the values in the hammer energy tables, indicated by
the index value.

      During conventional pre-calculation for a print line, the
resulting list of hammer fire data is ordered in the sequence that
the hammers will be fired.  This ordering is accomplished by various
methods that depend on the nominal hammer energy values.  The use of
hammer energy values that are different from the nominal would result
in un...