Patent ID: 11938718
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 14:
15. A printer, comprising:
a print engine to form an image upon a web media during a printing operation;
a supply reel to provide the web media during the printing operation;
a take-up reel for collection of the web media after the image is formed upon the web media;
a roller to apply a wrapping tension to the web media;
a web media height non-uniformity detection system, including
a first optical transmitter positioned adjacent to an end of the roller, to cause a first light beam to shine along a first path towards an opposite end of the roller such that the first light beam will be impacted by wrapped media along the first path,
a first optical receiver positioned adjacent to an opposite end of the roller to measure strength of the first light beam,
a second optical transmitter positioned adjacent to an end of the roller, to cause a second light beam to shine along a second path towards an opposite end of the roller such that the second light beam will not be impacted by wrapped media along the second path,
a second optical receiver positioned adjacent to an opposite end of the roller to measure strength of the second light beam, and

a media height non-uniformity identification component to identify a media height non-uniformity based upon the measured strengths of the first and second light beams, and to initiate a remedial action in response to such identification.