Browse Prior Art Database

Self Compensating Ribbon Tracking Device

IP.com Disclosure Number: IPCOM000048224D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Green, JW: AUTHOR [+3]

Abstract

A wobble roller is mounted on the shock wire near the ribbon exit of a cartridge. The roller is externally crowned and wobbles on a central internal contact point. The angle of the wobble roller adjusts to automatically provide self compensation during ribbon feed.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 83% of the total text.

Page 1 of 2

Self Compensating Ribbon Tracking Device

A wobble roller is mounted on the shock wire near the ribbon exit of a cartridge. The roller is externally crowned and wobbles on a central internal contact point. The angle of the wobble roller adjusts to automatically provide self compensation during ribbon feed.

Fig. 1 shows the side of a cartridge 1 (shown in dotted outline to emphasize internal parts) carrying a supply spool 3 delivering ribbon 5 leftwardly, as shown by the arrows. A shock wire 6 is secured within cartridge 1 and extends to the side of the cartridge, where a bend disposes an end vertically.

The vertical end of wire 6 receives the wobble roller 8. A ribbon lift guide 10 is positioned at the printing plane of the typewriter. Ribbon 5 passes around roller 8, to the typewriter, and back to a take-up spool (not shown) in cartridge 1.

Ribbon 5 is slightly narrower than roller 8. Fig. 2 shows roller 8 in cross section. Shock wire 6 is slightly smaller than the narrowest opening 20 formed by the opposing, cone shaped cavities 22 and 24. When installed in cartridge 1, roller 8 may simply rest on the bottom wall of the cartridge until moved upward under tension from ribbon 5. During ribbon feed, roller 8 contacts wire 6 at the sides of opening 20. Roller 8 rolls with the ribbon as it is fed during typing. Forces translated through roller 8 are sufficient to flex shock wire 6 so that it functions conventionally as e tensioning wire.

During ribbon feed, the angle...