Browse Prior Art Database

Ribbon Shield for Polyester Ribbon

IP.com Disclosure Number: IPCOM000108082D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+2]

Abstract

The described ribbon shield which is used in fully formed engraved character printers, reduces the viscous drag and adhesion between the special-purpose polyester ribbon and ribbon shield, thereby significantly reducing the ribbon drive motor requirements.

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This is the abbreviated version, containing approximately 98% of the total text.

Ribbon Shield for Polyester Ribbon

       The described ribbon shield which is used in fully formed
engraved character printers, reduces the viscous drag and adhesion
between the special-purpose polyester ribbon and ribbon shield,
thereby significantly reducing the ribbon drive motor requirements.

      This improvement is accomplished by minimizing the contact area
between the ribbon and ribbon shield by the use of the raised bumps 2
and recessed dishes 3 which are shown in Fig. 1.  Previous designs
using flat Mylar* ribbon shields resulted in stalling the ribbon
drive motor.  The bumps 2 and dishes 3 are heat formed into a thin
Mylar ribbon shield 1 as shown in Figs. 1 and 3.  The 45 raised bumps
2 protrude toward the print band (not shown) and are located in areas
of the shield 1 which are not aligned with the timing marks or
engraved characters of the print band. There are 16 dished recesses 3
which are aligned with, but project away from, the timing marks and
engraved characters of the print band.  This is necessary to prevent
ribbon and ribbon shield wear resulting from the motion of the band
in the restricted throat area of the printer.

      Shield 1 is bonded to a stainless steel frame 4 by the use of
pressure-sensitive tape in the overlapping area 5 between steel frame
4 and shield 1, as shown in Fig. 2.

      The assembly shown in Fig. 2 is attached within the printer
(not shown) via the two mounting holes 6.
*  Trademark of E. I. du Pont...