Ink cartridge with passageway for ink level indicator

Details Ink cartridge with passageway for ink level indicator Ink cartridge with passageway for ink level indicator

1992-12-22

1995-07-18

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 87, 73290R, 222 23, B41J 2195

Patent

active

054346037

ABSTRACT:
An ink jet pen supply cartridge having a spring biased ink reservoir with a visual indication of remaining ink quantity. The reservoir tends to collapse laterally as the ink supply decreases due to differential pressure exerted thereto. The spring-reservoir is contained in a rigid cartridge and a pair of flexible tape members are cemented or welded, one to each side of the spring-reservoir, and extend generally parallel toward a narrow end surface of the cartridge at which they overlap and can be viewed through a window. The overlapping relationship of the tape members provide ink quantity indicia which change as the spring-reservoir collapse draws them past each other.

REFERENCES:
patent: 4016885 (1977-04-01), Bruner
patent: 4196625 (1980-04-01), Kern
patent: 4415886 (1983-11-01), Kyogoku et al.
patent: 4422084 (1983-12-01), Saito
patent: 4935751 (1990-06-01), Hamlin
patent: 5079570 (1992-01-01), Mohr et al.
patent: 5152427 (1992-10-01), Pope et al.

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