Ink filter clogging sensor and indicator
First Claim
1. In an ink jet printing apparatus having an ink supply conduit and an ink filter provided in the conduit, the combination characterized by comprising:
- a first electrode provided in the conduit upstream of the filter;
a second electrode provided in the conduit downstream of the filter; and
sensor means connected to the first and second electrodes for sensing an electrical parameter therebetween.
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Accused Products
Abstract
An ink filter (15) is provided in an ink supply conduit (12). First and second electrodes (21), (22) are disposed in the conduit (12) upstream and downstream of the filter (15) respectively. A sensor means (23), (24), (27), (28), (32) measures an electrical parameter such as the electrical resistance, capacitance or the like between the electrodes (21), (22) which varies as a function of the degree of clogging of the filter (15). An indicator (34) such as a light or lights (36), analog meter (33) or the like indicates the magnitude of the electrical parameter and thereby whether the filter (15) is clogged or unclogged.
42 Citations
10 Claims
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1. In an ink jet printing apparatus having an ink supply conduit and an ink filter provided in the conduit, the combination characterized by comprising:
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a first electrode provided in the conduit upstream of the filter; a second electrode provided in the conduit downstream of the filter; and sensor means connected to the first and second electrodes for sensing an electrical parameter therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification