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Re-inking Roller for Ink Ribbon Cartridge

IP.com Disclosure Number: IPCOM000110687D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Kanno, T: AUTHOR

Abstract

Disclosed is the shape of the re-inking roller used in the ink ribbon cartridge. The re-inking type ribbon cartridge is widely used for wire matrix impact printers because the cartridge dimension is smaller than the conventional, non re-inking type ribbon cartridge. The major problem of the re-inking type ribbon cartridge is density uniformity in a character. It appears the top and bottom dots become darker after half of the ribbon life. The cause is the difference in ink volume contained between the middle the top/bottom of the ribbon. The ink at the top/bottom is not consumed by the printing, however, the ink is supplied by the re-inking roller to almost the full ribbon width. So, excessive ink exists at the top/bottom area of the ribbon.

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Re-inking Roller for Ink Ribbon Cartridge

       Disclosed is the shape of the re-inking roller used in
the ink ribbon cartridge. The re-inking type ribbon cartridge is
widely used for wire matrix impact printers because the cartridge
dimension is smaller than the conventional, non re-inking type ribbon
cartridge.  The major problem of the re-inking type ribbon cartridge
is density uniformity in a character.  It appears the top and bottom
dots become darker after half of the ribbon life.  The cause is the
difference in ink volume contained between the middle the top/bottom
of the ribbon.  The ink at the top/bottom is not consumed by the
printing, however, the ink is supplied by the re-inking roller to
almost the full ribbon width.  So, excessive ink exists at the
top/bottom area of the ribbon.  If the re-inking roller's shape is
designed as the narrow width to supply ink restricted to the middle
of ribbon width, it may cause ribbon feed trouble, such as ribbon
skew and ribbon jam.

      This article provides a re-inking roller which has the
characteristics of a non-uniform supply of ink without any
reliability degradation of the ribbon feed.  Fig. 1 shows the typical
layout of the re-inking type ink ribbon cartridge.  Several shapes of
re-inking rollers are proposed, and they have equal diameter from the
top to the bottom for the stable ribbon feed: however, the surface is
partially different between the middle and the top/bottom for
achieving the ink volu...