Browse Prior Art Database

Dynamic Measuring of Printer Hammer Flight Times

IP.com Disclosure Number: IPCOM000102324D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Poplawski, SM: AUTHOR

Abstract

Disclosed is a technique for measuring the hammer flight times while the printer is performing its normal task of printing user data without interfering with the performance of that task.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Dynamic Measuring of Printer Hammer Flight Times

       Disclosed is a technique for measuring the hammer flight
times while the printer is performing its normal task of printing
user data without interfering with the performance of that task.

      In impact printers, it is necessary to characterize each hammer
by measuring its flight time (or manually adjusting each hammer so
that its flight time is some nominal value).  Normally this is done
with a special procedure during a maintenance period for the printer.
These flight times are then used to determine when to fire/set the
hammers so that they will impact at the required instant.  These
times normally remain unchanged until the special flight time
procedure is repeated.  The actual flight times of the hammers change
with temperature, wear, and other conditions.  The result is printing
that is mis-registered in the horizontal direction.

      The 6262 model 22 uses a platen that is able to detect impacts.
The model 22 hardware is designed so that each hammer-set starts a
flight-timing timer and each platen impact stops the timer.  The
difficulty is that every hammer-set restarts the timer which makes it
impossible to gather measurements unless the printing is confined to
very special patterns which allow correct association of sets and
impacts.  The normal flight timing procedure uses a pattern of this
type to gather its information.

      This disclosure documents a technique that allows the...