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monitoring system with doppelspeicher for elektrostatographische equipment with interchangeable cartridges
monitoring system with doppelspeicher for elektrostatographische equipment with interchangeable cartridges
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机译:带多普勒皮镜的监护系统,用于带可互换药筒的静电描记术设备
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摘要
The monitoring system for replaceable units, e.g toner cartridges in an electrophotographic printer, includes on the unit an electronic count memory and an electronic flag memory. The count memory maintains a one-by-one count of prints made with the cartridge. The flag memory includes a series of bits which are alterable from a first state to a second state but not alterable from the second state to the first state. The bits in the flag memory are altered at predetermined intervals as prints are made with the cartridge. The flag memory is used as a check to override unauthorized manipulation of the count memory.
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