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Browse Prior Art Database

Improved Ribbon Shield

IP.com Disclosure Number: IPCOM000115229D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Boyanowski, RE: AUTHOR [+3]

Abstract

Because of the limited travel of the print wire in the shuttle matrix printers, serious constraints are placed on the thickness of the ribbon shield components. The use of a thin material between the ribbon (2) and paper (1) does not provide adequate protection to the ribbon when an outfold passes through the print area i.e., the increased thickness of outfold causes the ribbon to be pinched between the thin face place (6) and backing plate (5) of the ribbon shield, increasing the drag on the ribbon and the chances for a ribbon stall. Also, the thin face plate is more prone to damage when clearing paper jams and when cleaning the ribbon shield. A sketch of the current design is shown in Fig. 1.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Improved Ribbon Shield

      Because of the limited travel of the print wire in the shuttle
matrix printers, serious constraints are placed on the thickness of
the ribbon shield components.  The use of a thin material between the
ribbon (2) and paper (1) does not provide adequate protection to the
ribbon when an outfold passes through the print area i.e., the
increased thickness of outfold causes the ribbon to be pinched
between the thin face place (6) and backing plate (5) of the ribbon
shield, increasing the drag on the ribbon and the chances for a
ribbon stall.  Also, the thin face plate is more prone to damage when
clearing paper jams and when cleaning the ribbon shield.  A sketch of
the current design is shown in Fig.  1.

      The improved ribbon shield design (Fig. 2) increases the
thickness of the face plate (6) which doubles it's stiffness.  The
distance of the print wire (4) to the platen (3) is kept the same by
forming a bullet shaped print wire clearance hole (8) in the backing
plate (5), which opens the gap between the two plates while still
protecting the ribbon from the tip of the print wire.  The clearance
hole (7) in the face plate is increased to accommodate the bullet
shaped cross section and the ribbon.  In the improved ribbon shield,
an open channel between the face plate and the backing plate is
preserved due to the spacer bumps (9) in the backing plate, the
spacer at the bottom of the shield (10) and the stiffer face plate.

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