Ink level sensor and methods associated with it

FIELD: printing industry.

SUBSTANCE: ink level sensor comprises: a measuring capacitor which capacity varies with the change in the ink level in the chamber; a switch T2 for application to the measuring capacitor of voltage Vp, which charges the measuring capacitor; a switch T3 for the charge distribution between the measuring capacitor and the reference capacitor, resulting in a reference voltage Vg; and an evaluation transistor which configuration ensures the presence of resistance "source-drain" proportional to the reference voltage.

EFFECT: increase in accuracy.

17 cl, 10 dwg

 



 

Same patents:

FIELD: polygraphic industry.

SUBSTANCE: invention relates to marking of replacement resource units in printing devices. Method for marking of replacement resource units in printing devices consists in the fact that marking bundle of electromagnet energy is generated in printing device, and visually marked section of replacement subsystem is changed, which is at least partially located in printing device, for which purpose at least part of marked section is illuminated with marking bundle. Printing device, having body, and comprising replacement resource unit, which is at least partially arranged in body, besides replacement resource unit has visually marked section and unit of bundle direction, placed in body and intended for illumination of at least part of marked section with application of marking bundle of electromagnet energy.

EFFECT: invention makes it possible for a human being or machine to detect visual changes of marked section.

20 cl, 11 dwg

FIELD: polygraphic industry.

SUBSTANCE: invention relates to marking of replacement resource units in printing devices. Method for marking of replacement resource units in printing devices consists in the fact that marking bundle of electromagnet energy is generated in printing device, and visually marked section of replacement subsystem is changed, which is at least partially located in printing device, for which purpose at least part of marked section is illuminated with marking bundle. Printing device, having body, and comprising replacement resource unit, which is at least partially arranged in body, besides replacement resource unit has visually marked section and unit of bundle direction, placed in body and intended for illumination of at least part of marked section with application of marking bundle of electromagnet energy.

EFFECT: invention makes it possible for a human being or machine to detect visual changes of marked section.

20 cl, 11 dwg

FIELD: printing industry.

SUBSTANCE: ink level sensor comprises: a measuring capacitor which capacity varies with the change in the ink level in the chamber; a switch T2 for application to the measuring capacitor of voltage Vp, which charges the measuring capacitor; a switch T3 for the charge distribution between the measuring capacitor and the reference capacitor, resulting in a reference voltage Vg; and an evaluation transistor which configuration ensures the presence of resistance "source-drain" proportional to the reference voltage.

EFFECT: increase in accuracy.

17 cl, 10 dwg

FIELD: measurement equipment.

SUBSTANCE: invention discloses a printing head for jet printing and a fluid medium level sensor. At the same time the sensor comprises a nozzle, a fluid medium channel, a sensor plate on the bottom of the specified channel and a sensor circuit for determination of ink level during nozzle blowdown, when the sensor plate is exposed to air sucked into the channel via the nozzle.

EFFECT: proposed sensor of liquid level provides for accurate readings between moist and dry states.

17 cl, 22 dwg

FIELD: information technology.

SUBSTANCE: invention relates to an image forming device, such as a printer and fax machine or copier, where there is a fixing roller, in which there is a source of heating. Disclosed is a fixing device, comprising: first and second sensors for detection of first and second temperatures; first and second units of calculation for calculation of during start heating source of first and second temperature drops; memory parameter to store at least first and second threshold values of temperature drop; determination unit for producing determination result; unit for generating information for generating, based on a result of determination, information indicating on restart, indicating that image forming device should be restarted, because voltage power supply too low; and unit for transmitting information for transmitting information indicating on restart to a display device.

EFFECT: technical result is creation of an image forming apparatus for informing user about incorrect operation of imaging device, when it cannot start due to low voltage.

16 cl, 13 dwg

FIELD: printing industry.

SUBSTANCE: in one embodiment, the fluid ejection device includes a slotted ink hole formed in the print head crystal. The fluid ejection device also includes an ink level sensor (PILS) built into the print head to measure the ink level of the camera in fluid communication with the slotted hole and a resistor cleaning circuit inside the chamber to clean this chamber of ink.

EFFECT: increase the accuracy of determining the ink level.

8 cl, 13 dwg

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