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US 6,616,263 B2Granted
Image forming apparatus having position monitor
AssigneeHewlett-Packard Development Company, L.P.
InventorsWilliam J Allen, George C Ross
Life of this patent
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Abstract
The present invention provides an image forming apparatus having a fiducial reference point sensor that individually monitors the position of first and second fiducial reference points on a moving print device that are in spaced relation to one another.
Claims34
An image forming apparatus, comprising:
- a movable print device;
- at least first and second fiducial reference points on the movable print device in spaced relation to one another;
- and
- a fiducial reference point sensor that individually monitors the position of the first and second fiducial reference points.
1 more element
An image forming apparatus, comprising:
- a print device, including a carriage and a plurality of printer elements supported on the carriage, movable along a scan axis;
- at least a first and second cooperative elements carried by the print device in spaced relation to one another;
- a cooperative element sensor;
- and
- a controller, operably connected to the printer elements and the cooperative element sensor, that controls the operation of a first group of printer elements at least partially in response to data obtained by monitoring the first cooperative element with the cooperative element sensor and controls the operation of a second group of printer elements at least partially in response to data obtained by monitoring the second cooperative element with the cooperative element sensor.
2 more elements
A method of operating a print device having first and second fiducial reference points in spaced relation to one another, the method comprising the steps of:
- moving the print device;
- and
- individually monitoring the position of the first and second fiducial reference points.
An image forming apparatus comprising:
- a movable print device;
- means for individually monitoring the position of first and second reference points on the movable print device, said first and second reference points in a spaced relation to one another.
Dependencies are inferred from the claim text.