Method and apparatus for detecting the end of life of a print cartridge for a thermal ink jet printer
作者： Brian L. Helterline , Nancy Leigh Herald , Marilyn Louise Zuber , Susan A. Chavez , Donald L. Michael
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摘要: A method and apparatus for detecting the end of life a print cartridge thermal ink jet printer determines status warns user if is at or near its useful life. In first mode operation, an initial temperature printhead contained in checked after threshold amount expelled from printhead, such as high density swath during service routine. This then compared with maximum temperature. If exceeds temperature, warning about sent to user. does not exceed informed remaining portion cartridge. second final period time elapses since printhead. less than third heat transfer efficiency calculated. below minimum efficiency,
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