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Ribbon Cartridge With Means for Compensating for Ribbon Distortion Resulting from Humidity Changes

IP.com Disclosure Number: IPCOM000051892D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Toutant, EE: AUTHOR

Abstract

The present ribbon cartridge is directed to the problem of compensating for the effects of changes in humidity on the thin plastic ribbon which is commonly used in most present day impact printers. These changes in humidity result in lateral deformations of the ribbon surface. For example, in the case of such thin plastic based ribbons, at 50degrees F and 8% relative humidity (one extreme), a typical plastic ribbon of this type may be very stiff and brittle. At the opposite extreme, 85 degrees F and 80 degrees relative humidity, the ribbon becomes easily deformable. Thus, it is difficult to get good spooling of such ribbon with changes in the environment. The ribbon tension which produces good results at one extreme will often cause failure at the other extreme.

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Ribbon Cartridge With Means for Compensating for Ribbon Distortion Resulting from Humidity Changes

The present ribbon cartridge is directed to the problem of compensating for the effects of changes in humidity on the thin plastic ribbon which is commonly used in most present day impact printers. These changes in humidity result in lateral deformations of the ribbon surface. For example, in the case of such thin plastic based ribbons, at 50degrees F and 8% relative humidity (one extreme), a typical plastic ribbon of this type may be very stiff and brittle. At the opposite extreme, 85 degrees F and 80 degrees relative humidity, the ribbon becomes easily deformable. Thus, it is difficult to get good spooling of such ribbon with changes in the environment. The ribbon tension which produces good results at one extreme will often cause failure at the other extreme. Ideally, means should be included within the cartridge to provide high ribbon tension at low temperature and humidity conditions and low ribbon tension at high temperature and humidity conditions.

The ribbon structure shown diagrammatically in Fig. 1 and in a partial sectional view in Fig. 2 provides such a structure.

When the ribbon is pulled toward the take-up spool, it passes between two posts 10 and 11 which are separated by a narrow gap, as detailed in Fig. 2. The gap 12 is dimensioned such that a nearly flat ribbon (high temperature and humidity) could pass through unimpeded, while a deeply embossed ri...