Browse Prior Art Database

Ribbon Shield of Printers

IP.com Disclosure Number: IPCOM000121847D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Honda, Y: AUTHOR

Abstract

Disclosed is a device for a ribbon shield of a serial matrix printer. The device prevents damage to the shield hole when the hole scratches the paper edges and ink smudges on printed paper.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 89% of the total text.

Ribbon Shield of Printers

      Disclosed is a device for a ribbon shield of a serial
matrix printer.  The device prevents damage to the shield hole when
the hole scratches the paper edges and ink smudges on printed paper.

      A thin sheet 1 whose material is metal or plastic is attached
to a plastic guide 3 with an adhesive tape 2. The sheet thickness is
0.05 mm when the material is stainless steel, as shown in Fig. 1.

      A horizontal hole length L is determined not to touch ink
ribbons 4 and narrowed as much as possible, as shown at A-A section
in Fig. 2.  A vertical hole length H is determined not to interfere
with wires of a print head 5 and is narrowed as much as possible, as
shown at B-B section in Fig. 2.

      A slant S (A-A section) is designed so that the thin sheet
surface of the hole center is depressed 0.05-0.1 mm from the outside
surface. This slant decreases such that the horizontal edge of the
hole scratches folding lines burrs of a continuous form when the form
is fed. A thickness of the vertical plastic edge T at A-A section is
over 0.5 mm, and the edge radius R is over 0.3 mm.

      The vertical edges of a continuous form which swell at the
folding lines are scratched by a hole edge of a ribbon shield, when
the paper edges go into the hole of the shield, because the shield
moves to the right and left with high speed. However, this vertical
plastic edge of the hole prevents damage to the hole and paper edges.

      Thoug...