Printers and encoders
AssigneeHewlett-Packard Development Company, L.P.
InventorsMartin Urrutia Nebreda, Joan Marti Velasco Figueras, Jose Antonio Lopez Gonzalez, Jorge Porras Martinez
Life of this patent
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Abstract
Examples relate to machine readable storage storing machine readable instructions, arranged when implemented, to process a roller encoder signal, associated with rotation of a substrate engaging roller, and a drive encoder signal, associated with a drive for rotating a carrier bearing the substrate, to determine a characteristic associated with the substrate.
Claims10
A printer for printing onto a substrate, the printer comprising:
- a roller having a respective radius, the roller comprising a substrate engagement surface to rotate the roller in response to frictional coupling with a substrate;
- a roller encoder to generate a roller encoder signal associated with rotation of the roller;
- a mount to receive a carrier bearing the substrate;
- a drive arranged to rotate the carrier;
- a drive encoder to generate a drive encoder signal associated with rotation of the drive;
- and
- a processor, responsive to the roller encoder signal and the drive encoder signal:
- to determine a characteristic associated with the substrate;
- wherein the processor to determine the characteristic associated with the substrate comprises logic or circuitry to:
- determine a metric associated with the amount of substrate on the carrier, and
- determine the radius of the substrate on the carrier using a measure of rotation of the drive, a measure of rotation of the roller and the respective radius.
A non-transitory readable storage storing machine readable instructions, arranged when implemented in a processor, to process a roller encoder signal, associated with rotation of a substrate engaging roller, and a drive encoder signal, associated with a drive for rotating a carrier bearing the substrate, to determine a characteristic associated with the substrate,
- wherein the instructions to determine the characteristic associated with the substrate comprise further instructions to determine at least one of:
- a measure associated with a volume of substrate on the carrier,
- an error condition associated with the substrate,
- absence of the substrate, or
- presence of the substrate, and
- wherein the instructions further comprise at least one of instructions:
- to generate the signal indicating the substrate movement error of the substrate in response to the drive encoder signal being indicative of a forward or unspooling movement of the drive in conjunction with the roller encoder signal being indicative of no movement of the roller, or
- to generate the carrier present signal indicating whether or not the carrier has been detected in response to the drive encoder signal being indicative of a backward movement of the drive in conjunction with the roller encoder signal being indicative of no movement of the roller.
Dependencies are inferred from the claim text.