Print drums rotatable at different angular velocities
AssigneeHewlett-Packard Development Company, L.P.
InventorJeffrey F. Bell
Life of this patent
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Abstract
In some examples, a printing device includes a first print drum comprising a first ring gear defined on a surface of the first print drum, a second print drum comprising a second ring gear defined on a surface of the second print drum, a rotatable drive shaft, and pinion gears to engage the first ring gear and the second ring gear, wherein rotation of the drive shaft causes the pinion gears to interact with the first and second ring gears to rotate the first print drum and the second print drum at different angular velocities.
Claims20
A printing device comprising:
- a first print drum comprising a first ring gear defined on a surface of the first print drum;
- a second print drum coaxial to the first print drum comprising a second ring gear defined on a surface of the second print drum;
- a rotatable drive shaft;
- and
- pinion gears to engage the first ring, gear and the second ring gear, wherein rotation of the drive shaft causes the pinion gears to interact with the first and second ring gears to rotate the first print drum and the second print drum at different angular velocities.
An apparatus comprising:
- a first ring gear for a first print drum of a printing device;
- a second ring gear for a second print drum of the printing device;
- a rotatable drive shaft;
- and
- pinion gears to engage the first ring gear and the second ring gear, wherein rotation of the drive shaft causes the pinion gears to interact with the first and second ring gears to rotate the first and second ring gears at different angular velocities,
- where the first print drum is coaxial to the second print drum.
A printing system comprising:
- a split print drum comprising a plurality of print drums;
- a differential drive assembly to rotate a number of the plurality of print drums, the differential drive assembly comprising:
- a rotatable drive shaft;
- and
- pinion gears to engage gears of the plurality of print drums, wherein rotation of the drive shaft causes the pinion gears to interact with the gears of the plurality of print drums to rotate at different angular velocities, a first print drum and a second print drum that is coaxial to the first print drum;
- and
- a power source to supply an input torque to the drive shaft.
Dependencies are inferred from the claim text.