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US 10,474,054 B2Granted
Adjustments to print blanket bias voltages
AssigneeHP Indigo B.V.
InventorsVitaly Portnoy, Michel Assenheimer, Amiran Lavon, Ido Finkelman
Life of this patent
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Abstract
In an example, a method of controlling voltage applied to a print blanket within a printing device includes printing a print job. During the printing, a null cycle trigger is received. In response to the trigger, a print blanket bias voltage is reduced from a print bias level to a null bias level.
Claims15
A method of controlling voltage applied to a print blanket within a printing device, comprising:
- printing a print job, the printing including discharging a charged photoreceptor of the printing device with light, the discharging leaving a residual voltage upon the photoreceptor;
- during the printing, receiving an interrupt to trigger a null cycle;
- in response to the interrupt, reducing a print blanket bias voltage, utilizing a controller, from a print bias level to a null bias level that is below a corona breakdown threshold voltage but above the residual voltage;
- stopping the printing during the null cycle;
- detecting that the interrupt has stopped;
- in response to detecting that the interrupt has stopped,
- changing the print blanket bias voltage from the null bias level back to the print bias level;
- and
- inserting a print cycle into the print job following the null cycle.
6 more elements
A printing device comprising:
- a photoreceptor to, after being charged, be discharged with light, wherein the discharging is to leave a residual voltage upon the photoreceptor,
- a print blanket to receive an ink image from the photoreceptor;
- a bias unit to set a bias voltage of the print blanket;
- a voltage source to provide a print bias voltage and a null cycle bias voltage;
- and
- a controller to:
- detect an interrupt for a print job being printed by the printing device;
- responsive to the interrupt, adjust a set-point of the bias unit from the print bias voltage to the null cycle bias voltage,
- wherein the null cycle bias voltage comprises a voltage value between the print blanket and the photoreceptor that is below a corona breakdown threshold voltage but is above the residual voltage;
- detect that the interrupt has stopped;
- in response to detecting that the interrupt has stopped,
- adjust the set-point of the bias unit back to the print bias voltage;
- and
- insert a print cycle into the print job.
11 more elements
A non-transitory machine-readable storage medium storing instructions that when executed by a processor of a printing device, cause the printing device to:
- during a print cycle of a printing process, discharge a charged photoreceptor of the printing device with light, the discharging leaving a residual voltage upon the photoreceptor;
- detect an interrupt from a printing subsystem;
- in response to detecting the interrupt,
- direct a bias unit to change a print blanket bias voltage from a print bias level to a null bias level that is below a corona breakdown threshold voltage but above the residual voltage;
- and
- insert a first null cycle into the printing process following the print cycle, wherein printing stops during the null cycle;
- insert an additional null cycle following the first null cycle for each null cycle in which the detection of the interrupt persists;
- and
- maintain the print blanket bias voltage at the null bias level during each null cycle.
6 more elements
Dependencies are inferred from the claim text.