Ribbon Cartridge With Means for Compensating for Ribbon Distortion Resulting from Humidity Changes
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
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.