Apparatus and method for detecting ribbon cassette usage

Details Apparatus and method for detecting ribbon cassette usage Apparatus and method for detecting ribbon cassette usage

G - Physics

01

N

340/124

G01N 27/04 (2006.01) B41J 31/16 (2006.01)

Patent

CA 2030675

A method and apparatus for electronically determining when a ribbon cassette in a printer should be replaced. The ribbon cassette comprises a housing and an electrically conductive ink ribbon stored in the housing. The apparatus comprises a detection apparatus which includes a first conductor and a second conductor which pass through the housing and contact the ink ribbon, thereby enabling a signal to be generated when the electrical resistance of the ink ribbon equals a predetermined resistance. A controller coupled to the detection apparatus causes a message that the ribbon cassette needs to be replaced to be displayed on a display in response to the signal. The method entails generating a first signal corresponding to the electrical resistance of at least a portion of the ink ribbon; and then generating a second signal when the first signal equals a third signal corresponding to the predetermined resistance of the ink ribbon.

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