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Long Lasting Reinking Mechanism

IP.com Disclosure Number: IPCOM000112366D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Wilson III, JT: AUTHOR [+2]

Abstract

A reinking system contains ribbon drive spools (not shown), a transfer roll driven by the ribbon and an inked sponge driven by the transfer roll. Ink is transferred from the sponge to the transfer roll and on to the ribbon. There is a tendency for the ink to migrate from the top of the sponge to the bottom, which in turn prevents ink from being effectively transferred to that part of the ribbon located at the upper end of the sponge. This causes print density variations across the printed page.

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Long Lasting Reinking Mechanism

      A reinking system contains ribbon drive spools (not shown), a
transfer roll driven by the ribbon and an inked sponge driven by the
transfer roll.  Ink is transferred from the sponge to the transfer
roll and on to the ribbon.  There is a tendency for the ink to
migrate from the top of the sponge to the bottom, which in turn
prevents ink from being effectively transferred to that part of the
ribbon located at the upper end of the sponge.  This causes print
density variations across the printed page.

      A solution to extending the effective life of the sponge, and
thus the reinking system, is shown in the Figure above.  Print
quality improvements are also obtained.  The upper half of sponge 1
is not in contact with the transfer roll 2, and as such essentially
acts as a reservoir.  Gravity causes the ink to migrate to that
portion of the sponge where it is being used.  There is no ink below
the ribbon 3 that has to overcome gravity.  Thus a greater portion of
the ink in the sponge is consumed by printing.  This dramatically
enhances the life of the sponge while not increasing the space
requirement in the X-Y plane.  Additionally, the uniformity of print
is improved as a result of the gravity "head" or reservoir above the
contact area between the sponge and the transfer roll.  This extra
height of the sponge (approximately two times) allows for more
uniform transfer of ink along the transfer roll and thus along the
rib...