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Optimizing Print Head Motor and Paper Motor Overlap

IP.com Disclosure Number: IPCOM000109448D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 70K

Publishing Venue

IBM

Related People

Brown, M: AUTHOR [+3]

Abstract

Disclosed is an algorithm to optimize the overlap between the print head motor and the paper motor. Better optimization between the two motors increases the lines per minute print speed. The optimization is accomplished by inserting a PEL dependent number of blank options at the end of the print line.

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This is the abbreviated version, containing approximately 61% of the total text.

Optimizing Print Head Motor and Paper Motor Overlap

      Disclosed is an algorithm to optimize the overlap between the
print head motor and the paper motor.  Better optimization between
the two motors increases the lines per minute print speed.  The
optimization is accomplished by inserting a PEL dependent number of
blank options at the end of the print line.

      A common problem in serial printers is the optimization of the
overlap between the print head motor and the paper motor.  Paper
movement cannot occur while the print head is printing.  When all the
characters on the print line have been printed, an interrupt is
generated from the ASIC; signalling the microcode that the print
buffer is empty.  However, the ASIC could have as many as five print
options remaining in the print latches in hardware.  The buffering is
necessary because of the print head design.  The design is 5 vertical
wires parallel with a second bank of 4 vertical wires separated by a
distance of .060 inches.  Buffering must occur to accommodate the
separation of the print head banks.  Because of this buffering, the
signal to start paper movement could be given before the last option
is printed on the page, causing unacceptable parts.  Before the paper
motor can start moving, it is mandatory that the print latches be
empty.

      To guarantee that the print latches are empty, and that the
overlap between the print head and the paper motor is as short as
possible, a PEL depend...