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Apparatus and method for detecting ink in a reservoir

A reservoir and ink technology, applied in instruments, measuring devices, liquid level indicators, etc., can solve problems such as inability to accurately determine ink volume, difficulty in identifying ink volume changes, and inability to accurately quantify ink volume changes

Active Publication Date: 2015-01-28
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty with optimal control of reservoir volume is the inability to accurately determine the ink volume in the reservoir and the inability to accurately quantify ink volume changes during printing and ink replenishment
Difficult to recognize ink volume changes while printing and replenishing

Method used

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  • Apparatus and method for detecting ink in a reservoir
  • Apparatus and method for detecting ink in a reservoir
  • Apparatus and method for detecting ink in a reservoir

Examples

Experimental program
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Embodiment Construction

[0013] As used in this document, a thermistor refers to a ceramic, polymer, or other material with a positive or negative temperature coefficient. The electrical resistance of this material changes as the temperature of the material changes. If the thermistor has a negative temperature coefficient, the resistance of the thermistor material decreases as the temperature of the material increases. Alternatively, as the temperature of the thermistor decreases, the resistance of the material increases. The inverse resistance / temperature relationship is true for materials with positive temperature coefficients. Thermistors are usually enclosed in a thermally conductive material, such as glass, and connected to a current or voltage source through an electrical conductor. Typically, the electrical conductor is configured as a pair of conductive leads extending from the thermistor to enable the thermistor to be electrically coupled or connected to an electrical circuit. In the syste...

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PUM

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Abstract

A method detects the level of ink in a print head reservoir by monitoring the power drawn by a thermistor positioned within the print head reservoir by an electrical conductor. The method includes dissipating heat in a thermistor positioned within an ink reservoir, the thermistor having an electrical conductor that extends from the thermistor, a length of the electrical conductor extending through at least a portion of the ink reservoir, providing electrical power through the electrical conductor to the thermistor to maintain the thermistor at a predetermined temperature that is a fixed differential above a temperature of the ink reservoir, measuring a parameter that corresponds to the heat dissipated from the thermistor and the length of the electrical conductor extending through the portion of the ink reservoir, and correlating the measured parameter to a predetermined value corresponding to an ink level in the ink reservoir to detect a position of the ink level in the reservoir continuously along the length of the electrical conductor and the thermistor.

Description

technical field [0001] The apparatus and methods described below relate to detecting ink levels remaining in a printer, and more particularly to using a thermistor to detect ink levels in a printhead reservoir. Background technique [0002] Inkjet printers, including phase change or solid ink printers, may include a printhead having a smaller ink reservoir fluidly connected to a larger main ink reservoir. Each primary ink reservoir holds a quantity of liquid ink. The printer includes circuitry to provide a portion of ink from the main reservoir to the printhead reservoir. The two-part reservoir system reduces the mass of the printhead, thereby reducing energy consumption and increasing print speed. In addition, systems employing solid inks have additional benefits, since the small ink reservoirs on the printhead avoid having to continuously apply nominal thermal control to the overall supply of solid inks in the main reservoir for each accepted job. However, the two-part ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/175
CPCB41J2/17566G01F23/246B41J29/393
Inventor 米尔扎·沙巴诺维奇玛丽·E·奥托姆
Owner XEROX CORP
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