Apparatus and method for detecting depletion of ink in an ink ri

Details Apparatus and method for detecting depletion of ink in an ink ri Apparatus and method for detecting depletion of ink in an ink ri

1990-07-11

1992-04-28

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

400208, 400703, 400712, B41J 3536

Patent

active

051082098

ABSTRACT:
A method and apparatus for electronically determining when a ribbon cassette in a printer should be replaced. The ribbon cassette comprises a housing and an electrically conductive ink ribbon stored in the housing. The apparatus comprises a detection apparatus which includes a first conductor and a second conductor which pass through the housing and contact the ink ribbon, thereby enabling a signal to be generated when the electrical resistance of the ink ribbon equals a predetermined resistance. A controller coupled to the detection apparatus causes a message that the ribbon cassette needs to be replaced to be displayed on a display in response to the signal. The method entails generating a first signal corresponding to the electrical resistance of at least a portion of the ink ribbon; and then generating a second signal when the first signal equals a third signal corresponding to the predetermined resistance of the ink ribbon.

REFERENCES:
patent: 4268182 (1981-05-01), Mizutani et al.
patent: 4375339 (1983-03-01), Dyer et al.
patent: 4407593 (1983-10-01), Haftmann
patent: 4662766 (1987-05-01), Teichmann et al.
patent: 4676678 (1987-06-01), Watanabe
patent: 4676681 (1987-06-01), Kikuchi et al.
patent: 4678139 (1987-07-01), Harry
patent: 4685818 (1987-08-01), Kazarian et al.
patent: 4728206 (1988-03-01), Mori et al.
patent: 4728207 (1988-03-01), Foster
patent: 4729676 (1988-03-01), Smith et al.

Affiliated with

Also associated with

Rating

Apparatus and method for detecting depletion of ink in an ink ri does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for detecting depletion of ink in an ink ri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for detecting depletion of ink in an ink ri will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1243329