Charge roller positioning
AssigneeHP Indigo B.V.
InventorsShmuel Borenstain, Ami Halfon, Henryk Birecki, Seongsik Chang
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Abstract
In one example, a method for calibrating a position of a charge roller is described. The method may include a processor positioning a first end of a charge roller to a first plurality of index positions, determining a capacitance between the charge roller and a photoconductor imaging plate at each of the first plurality of index positions, determining a first index position of the first plurality of index positions with a greatest change in capacitance, and calibrating a position of the charge roller based upon the first index position.
Claims20
A method comprising:
- positioning a first end of a charge roller to a first plurality of index positions;
- determining a capacitance between the charge roller and a photoconductor imaging plate at each of the first plurality of index positions;
- calculating a change in capacitance for each of the first plurality of index positions based upon the capacitances that are determined;
- and
- calibrating a position of the charge roller based upon the calculated change in capacitance for each of the first plurality of index positions.
A method for adjusting a position of a charge roller comprising:
- measuring an alternating current in a printing device, wherein the printing device comprises a charge roller and a photoconductor imaging plate;
- determining a capacitance between the charge roller and the photoconductor imaging plate, wherein the capacitance is determined based upon a measurement of the alternating current;
- calculating a distance between the charge roller and the photoconductor imaging plate based upon the capacitance;
- and
- adjusting a position of the charge roller based upon the distance that is calculated.
A device comprising:
- a charge roller;
- a photoconductor imaging plate;
- at least one positioning unit for positioning at least a first end of the charge roller to a first plurality of index positions;
- a current sensor, for measuring an alternating current in a circuit comprising the charge roller and the photoconductor imaging plate when the at least the first end of the charge roller is at each of the first plurality of index positions, wherein the alternating current is proportional to a capacitance between the charge roller and the photoconductor imaging plate;
- and
- a controller to:
- calculate a change in capacitance for each of the first plurality of index positions based upon the measurement of the alternating current;
- and
- calibrating a position of the charge roller based upon the change in capacitance for each of the first plurality of index positions.
Dependencies are inferred from the claim text.