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US 11,143,978 B2Granted
Charge roller gap determination
AssigneeHewlett-Packard Development Company, L.P.
InventorsSeongsik Chang, Omer Gila, Daniel Espinosa, Anthony W. McLennan, Eyal Lovton, Asael Degany
Life of this patent
Estimating the term…
Abstract
A device includes a charge roller and a control portion. The charge roller is removably insertable to be in charge-transferring relation to, and spaced apart by a first air gap from, a photoconductive imaging portion of an electrophotographic printer. The control portion is to determine a size of the first air gap based on determination of a charging threshold voltage associated with the charge roller.
Claims15
A device comprising:
- a charge roller removably insertable into charge-transferring relation to, at a first air gap from, a photoconductive imaging portion of an electrophotographic printer;
- and
- a control portion to:
- determine a charging threshold voltage associated with at least the charge roller;
- and
- determine a size of the first air gap, via the determined charging threshold voltage, based on an array of different charging threshold voltages, including the determined charging threshold voltage, corresponding to an array of differently sized air gaps, including the size of the first air gap.
3 more elements
A computer program product comprising:
- a non-transitory tangible medium storing machine-readable instructions, executable by a processor, to determine a size of a first air gap between an external surface of a removably insertable charge roller and a photoconductive imaging portion of an electrophotographic printer, the determination via the stored instructions comprising:
- determination of a charging threshold voltage associated with at least the charge roller and as a function of the size of the air gap;
- and
- identifying the size of the first air gap in increments between about 1 micrometer and 10 micrometers.
1 more element
A method comprising:
- positioning a charge roller to be spaced apart by a first air gap from, and in charge-transferring relation to, an imaging portion of a photoconductor of an electrophotographic printer;
- and
- determining a size of the first air gap, without using a physical or electronic measurement tool independent of the electrophotographic printer, via:
- measuring a first voltage of the charge roller;
- measuring at least one of a second voltage of the imaging portion and a current of the charge roller;
- and
- determining a charging threshold voltage of the charge roller, as a function of the size of the air gap, based on the measured first voltage and at least one of the measured second voltage and the measured current;
- and
- identifying the size of the first air gap, via the determined charging
- threshold voltage, according to an array of different charging threshold voltages, including the determined charging threshold voltage, which correspond to an array of differently sized air gaps, including the size of the first air gap.
7 more elements
Dependencies are inferred from the claim text.