Developed mass per unit area controller without using electrostatic measurements
AssigneeXerox Corporation
InventorLingappa K. Mestha
Life of this patent
Estimating the term…
Abstract
An electrostatographic printing machine having an imaging system for projecting and developing images on an imaging member. A process control loop includes a sensor to measure developed mass per unit area on at least three test patches on the imaging member including high area coverage, low area coverage, and mid tone coverage. A comparator responds to the sensor measurements and to developed mass per unit area setpoints to provide error signals. A control unit responds to the error signals to adjust projecting, developing, and imaging member subsystems.
Claims19
In an imaging system for projecting and developing images on an imaging member, a process control loop comprising;
- a sensor to measure developed mass per unit area, the sensor measuring at least three test patches on the imaging member including high area coverage, low area coverage, and mid tone coverage,
- a control unit to process the error signals to actuate projecting, developing, and imaging member subsystems, the control including stored nominal actuator values, an integrator, and a compensator, the compensator responding to the integrator and nominal actuator values.
An electrostatographic printing machine having an imaging member, a charging device for charging the imaging member, an image projecting device, and a developer device for apply toner to the imaging member, a control having control parameters comprising:
- a sensor to sample developed toner mass per unit area on the imaging member and provide signals,
- a first actuator signal to enable the charging device,
- a second actuator signal to enable the developer device,
- a control responsive to the sensor signals to adjust both the first actuator signal to enable the charging device and the second actuator signal to enable the developer device, the control including stored nominal actuator values, an integrator, and a compensator, the compensator responding to the integrator and nominal actuator values.
An electrostatographic printing machine having an imaging member, a charging device for charging the imaging member, an image projecting device, and a developer device for apply toner to the imaging member, a control having control parameters comprising:
- a sensor to sample developed toner mass per unit area on the imaging member and provide signals,
- a first actuator signal to enable the charging device,
- a second actuator signal to enable the developer device,
- a source of reference signals,
- a comparator responsive to the reference signals and the sensor signals to provide error signals, and
- a control including an integrator and summing node responsive to the error signals to adjust both the first actuator signal to enable the charging device and the second actuator signal to enable the developer device.
Dependencies are inferred from the claim text.