Browse Prior Art Database

Compliant Metal Ribbon Shield

IP.com Disclosure Number: IPCOM000110452D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Kunz, BH: AUTHOR [+4]

Abstract

Ribbon Shields in line printers are used to protect the print paper from ribbon ink and to separate the ribbon and the paper.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 91% of the total text.

Compliant Metal Ribbon Shield

      Ribbon Shields in line printers are used to protect the print
paper from ribbon ink and to separate the ribbon and the paper.

      As referred to in the figure, the all-metal compliant ribbon
shield A held to the hammer casting via retaining knobs E is forced
down at the point of contact D when the printer front end is closed.
Upon closing the front end, the ribbon shield A is pressed downward
onto the printer forms C.  The radius of the ribbon shield A creates
a pocket so that the ribbon path B is relatively unobstructed, thus
creating one of the vital elements of desirable ribbon tracking.

      This ribbon shield (See A of Fig. 1) has a collection of
features:
      1.  Air under the ribbon is assured by etched, raised areas on
the shield surface, thus reducing drag.
      2.  The strength and curvature of the shield creates an upward
force for the necessary paper clearance when the print unit is opened
for loading.
      3.  At closing of the print unit, the contact points (See D of
Fig. 1) push the shield smoothly against the paper, allowing the dish
shape to provide maximum clearance for the ribbon.
      4.  A window in the steel allows the print hammers the desired
drive of the paper into the ribbon and band for printing.  Due to the
shield curvature, the edges of the hammer window raise slightly,
decreasing the exposure to paper folds catching on the shield edges
as the paper is transporte...