Browse Prior Art Database

High Quality Printing for Passbook Printer

IP.com Disclosure Number: IPCOM000104684D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Endoh, M: AUTHOR [+3]

Abstract

Disclosed is a method of improving print quality for passbook printer by improving print quality at both the last line and the first line over the binding margin of the passbook.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

High Quality Printing for Passbook Printer

      Disclosed is a method of improving print quality for passbook
printer by improving print quality at both the last line and the
first line over the binding margin of the passbook.

      As a passbook centerfold is usually sewed, the stiffness of a
leaf becomes very high near the binding margin as to cause the
air-layer between leaves.  So, when printing on the last line and the
first line over the binding margin, the stiffness and the air-layer
prevent a platen to clamp a passbook firmly as well as other lines,
i.e. the head-gap becomes wide and the air-layer works as a dumping
system for print head wire.  These conditions cause some ribbon
smudges and poor print quality on these two lines.  To solve these
problems, following three methods are combined.

1.  Optimize the passbook clamping mechanism, i.e.  front-bar 1,
    back-bar 2 and platen 3 are designed to minimize the air-layer's
    existence.  (Refer to FIGURE)

2.  Control the delay time between the passbook clamping and printing
    so that the passbook is clamped firmly, e.g. it is twice of other
    lines.

3.  Control the print head wire drive pulse width so that the wire
    stroke becomes longer, e.g. it is 0.1 mm longer than other lines.

      These methods are also effective for a high speed print on
multi-parts cutforms, which consist of more than 6 pieces.