Liquid presence/absence detecting device using digital signals i

Details Liquid presence/absence detecting device using digital signals i Liquid presence/absence detecting device using digital signals i

1997-10-01

2000-07-11

Barlow, John

Incremental printing of symbolic information

Ink jet

Controller

73304R, 340620, B41J 2175

Patent

active

060861797

ABSTRACT:
A pair of digital signals outputted from output ports of a CPU in opposite phase are applied to a pair of electrodes attached to an ink cartridge through inverters. A digital signal developed from the electrode connected to a resistor having a resistance value larger than or substantially equal to an ink resistance is inputted to a detection port through a hysteresis inverter. The CPU detects the presence/absence of ink in the cartridge, based on the phase relation of the digital signal applied through the hysteresis inverter with the digital signal outputted from the output port of the CPU or based on the presence/absence of the digital signal from the hysteresis inverter.

REFERENCES:
patent: 4788861 (1988-12-01), Lichti
patent: 5613399 (1997-03-01), Hannan et al.
patent: 5682184 (1997-10-01), Stephany et al.

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