Hybrid control system for a copier
AssigneeXerox Corporation
InventorJeffrey J. Folkins
Life of this patent
Estimating the term…
Abstract
An apparatus which measures the electrical current biasing a developer roller and transmits a control signal corresponding thereto to control discharging of marking particles in a development system of an electrophotographic printing machine. At selected intervals, the control signal is adjusted as a function of the measured mass to area ratio of the marking particles deposited on a test area recorded on the photoconductive member.
Claims13
An apparatus for controlling the discharge of marking particles into a development system of a printing machine adapted to have a test area recorded, at selected intervals, on a member, including:
- means for transporting marking particles closely adjacent the member to deposit marking particles on the test area recorded thereon;
- means for electrically biasing said transporting means to a selected magnitude and polarity;
- means for sensing current electrically biasing said transporting means and transmitting a signal proportional thereto;
- means for detecting, at selected intervals, the mass to area ratio of the marking particles deposited on the test area and transmitting a signal proportional thereto;
- and
- means, responsive to the signal from said sensing means and from said detecting means, for generating a marking particle discharge signal.
An electrophotographic printing machine of the type having a photoconductive member and at least one processing station, wherein the improvement includes:
- means for transporting marking particles closely adjacent the photoconductive member;
- means for electrically biasing said transporting means to a selected magnitude and polarity;
- means for sensing current electrically biasing said transporting means and transmitting a signal proportional thereto;
- means for generating, at selected intervals, a signal adapted to adjust the signal from said sensing means;
- and
- means, responsive to the signal from said sensing means and from said generating means, for producing a control signal for regulating the processing station.
Dependencies are inferred from the claim text.