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US 10,165,150 B2Granted
Printer with two scanners
AssigneeHP Indigo B.V.
InventorsRan Waidman, Sagi Refael, Lior Katz
Life of this patent
Estimating the term…
Abstract
A printer (300) is disclosed. The printer has two scanners (336, 338) in the paper path of the printer located after the print zone (346). The two scanners are spaced apart from each other by a known distance A and overlap each other in a direction perpendicular to the media axis of travel. The two scanners capture a first and second image of the media.
Claims18
A printer, comprising:
- a paper path, the paper path having a media feeding position and a media take-up position;
- a print zone located between the media feeding position and the media take-up position;
- a first scanner and a second scanner located in the paper path between the print zone and the media take-up position, the first scanner offset from the second scanner along a media axis of motion by a distance A, the first scanner overlapping the second scanner on the media axis of motion, the first scanner to capture a first image of a first side of media, the second scanner to capture a second image of the first side of the media, and
- wherein the first scanner and the second scanner have equal exposure times and the exposure time is a constant and the first image and the second image are captured starting at time t0;
- and
- a controller to calculate the scaling of the images along a length of the media by comparing the overlapped area in the first image to the overlapped area in the second image.
3 more elements
A method of printing, comprising:
- printing a reference mark onto media in a print zone of a paper path;
- scanning a first image of the reference mark with a first scanner from a first location in the paper path, where the first location is between the print zone and a media take-up location;
- scanning a second image of the reference mark with a second scanner from a second location in the paper path, where the second location is between the first location and the media take-up location;
- and
- calculating the speed of the media in the paper path between the first and second scanners using the location of the reference mark in the first and second images;
- wherein the first scanner and the second scanner have equal exposure times and the exposure time is a constant and the first image and the second image are captured starting at time t0.
3 more elements
A non-transitory computer readable medium containing computer executable instructions, that when executed by a processor in a printer, performs the following method, comprising:
- printing a reference mark onto media in a print zone of a paper path;
- scanning a first image of the reference mark with a first scanner from a first location in the paper path, where the first location is between the print zone and a media take-up location;
- scanning a second image of the reference mark with a second scanner from a second location in the paper path, where the second location is between the first location and the media take-up location,
- wherein the first scanner and the second scanner have equal exposure times and the exposure time is a constant and the first image and the second image are captured starting at time t0;
- calculating the speed of the media in the paper path between the first and second scanners using the location of the reference mark in the first and second images;
- and
- adjusting a location of a subsequent printed image on the media based on the calculation of the speed of the media in the paper path.
4 more elements
Dependencies are inferred from the claim text.