Differential printing device
AssigneeHewlett-Packard Development Company, L.P.
InventorJeffrey F. Bell
Life of this patent
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Abstract
A differential printing device includes a first print drum including a first ring gear defined on an outside surface of the first print drum. The device also includes a second print drum including a second ring gear defined on an outside surface of the second print drum. A drive shaft that rotates the first print drum and the second print drum has a number of pinion gears to engage the first ring gear and the second ring gear. The number of pinion gears rotate the first print drum and the second print drum at different angular velocities.
Claims19
A differential printing device comprising:
- a first print drum comprising a first ring gear defined on an outside surface of the first print drum;
- a second print drum coaxial to the first print drum comprising a second ring gear defined on an outside surface of the second print drum;
- a drive shaft to rotate the first print drum and the second print drum, the drive shaft comprising a number of pinion gears to engage the first ring gear and the second ring gear;
- in which the number of pinion gears rotate the first print drum and the second print drum at different angular velocities.
A differential print drum comprising:
- a first print drum rotably coupled to a drive shaft via a first pinion gear and first ring gear, the first pinion gear having multiple degrees of motion;
- and
- a second print drum rotably coupled to the drive shaft via a second pinion gear and second ring gear, the second pinion gear having multiple degrees of motion and the second print drum coaxial to the first print drum;
- in which the first print drum and the second print drum are driven by the drive shaft at different angular velocities relative to motion of the first ring gear and the second ring gear as caused by spin of the first pinion gear and the second pinion gear.
A differential printing system comprising:
- a split print drum comprising:
- a plurality of coaxial print drums positioned adjacent to one another;
- a drive shaft comprising a differential mechanism to selectively rotate a number of print drums, wherein the differential mechanism comprises a number of pinion gears to selectively engage with a plurality of ring gears disposed on outside surfaces of the plurality of coaxial print drums;
- and
- a power source to supply an input torque to the drive shaft based on the motion of the coaxial print drums relative to one another;
- in which the number of coaxial print drums receive a number of passes of paper.
Dependencies are inferred from the claim text.