Plotter pen ink level detector

Details Plotter pen ink level detector Plotter pen ink level detector

1988-08-26

1989-11-14

Broome, H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346139R, 346139C, 200 82E, 200 84C, 116110, 116264, 137558, 222 51, 73305, G01D 1516

Patent

active

048810886

ABSTRACT:
In a computer controlled automatic plotting device, an ink level detector is provided in a plotter pen cartridge. An ink-following object is provided in the plotter pin cartridge and is supported by the writing fluid. The ink-following object carries a magnet. As the ink-following object traverses down the inside of the plotter pen cartridge, the position of the magnet triggers a sensor at a predetermined level. The sensor then effects a visual or audible signal to alert an operator that the cartridge is running out of writing fluid. Alternatively, the sensor activates a control system to shut down the plotting device to permit replacement of the plotter pen cartridge with one having a new ink supply.

REFERENCES:
patent: 3046475 (1962-01-01), Binford
patent: 3242474 (1966-03-01), Gast
patent: 3389603 (1968-06-01), Jacobs
patent: 3939482 (1976-02-01), Cotter
patent: 3942526 (1976-03-01), Wilder
patent: 4035789 (1977-07-01), Akita
patent: 4290059 (1981-09-01), Noyes
patent: 4350458 (1982-09-01), Murahara
patent: 4615303 (1986-10-01), Sackett

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