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Print Force Control by Magnetic Strip Reader/Encoder or Optical Line Finder/Optical Page Recognition

IP.com Disclosure Number: IPCOM000113859D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hada, T: AUTHOR [+3]

Abstract

Disclosed is a method of improving print quality for impact dot matrix pass book printer (Fig. 1). This is done by controlling the pulse width of the drive current for firing print pin of the print head.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 82% of the total text.

Print Force Control by Magnetic Strip Reader/Encoder or Optical Line
Finder/Optical Page Recognition

      Disclosed is a method of improving print quality for impact dot
matrix pass book printer (Fig. 1).  This is done by controlling the
pulse width of the drive current for firing print pin of the print
head.

      As a passbook has multiple leaves and center fold is usually
sewed, the print quality varies with page and print location on a
page.  The trend of the print quality is as follows (Fig. 2).
  better  worse
    A > B > C > D

      Especially in areas C and D, the print quality becomes
substantially degraded, because the paper stiffness and the air layer
between pages prevent printer platen to firmly clamp down the print
area of a pass- book.  To overcome the effect of paper stiffness and
air layer, it is effective to increase of impact force of print head
by extending of drive pulse.  However, good effect is
respected,another week side could not be resolved such as short life
of print head and ribbon jam problem.  To eliminate these week point,
following methods are employed.
  1.  Recognize the page and the line to be printed, by reading
      the page an line data which are encoded on the magnetic
      stripe of the passbook.  These data are fedback to the
      drive controller to control the pulse width of the drive
      current.
  2.  Recognize the page and the line to be printed, by reading
      the pa...