Measured sensor distance correction
AssigneeHP Indigo B.V.
InventorsNimrod Lucas, Ofer Hollenberg, Ran Soffer
Life of this patent
Estimating the term…
Abstract
Example implementations relate to determining a correction factor that converts a measured sensor distance to a calibrated sensor distance. The measured sensor distance may be based on an amount of substrate advancement through a web printing press between detecting a mark on the substrate at a first sensor and detecting the mark at a second sensor. The calibrated sensor distance may be the separation between the first sensor and the second sensor.
Claims20
A distortion correction device for a web printing press, the device comprising:
- a first sensor and a second sensor separated by a calibrated sensor distance, the first and second sensors to detect marks on a substrate as the substrate advances through the press;
- an encoder to detect advancement of the substrate;
- and
- a scaling measurement correction module to:
- detect a mark on the substrate with the first sensor;
- detect the mark on the substrate with the second sensor;
- using an output from the encoder, determine a measured distance between the sensors based on detection of the mark at each sensor;
- compare the measured distance to the calibrated sensor distance;
- determine a correction factor based on the comparison of the measured distance to the calibrated sensor distance;
- and
- adjust operation of the web printing press based on the correction factor.
An apparatus comprising:
- a first sensor and a second sensor mounted in a web printing press and separated by a calibrated sensor distance, the first and second sensors to detect marks on a substrate as the substrate advances through the press;
- an encoder to detect advancement of the substrate;
- and
- a scaling measurement correction module to:
- determine a measured sensor distance based on an amount of substrate advancement, as detected by the encoder, between detection of a mark by the first sensor and detection of the mark by the second sensor,
- determine a correction factor to convert the measured sensor distance to the calibrated sensor distance, and
- adjust operation of the web printing press based on the correction factor.
A method of distortion correction for a web printing press, the method comprising:
- with a first sensor and a second sensor separated by a calibrated sensor distance, the first and second sensors to detect marks on a substrate as the substrate advances through the press, detecting a mark on the substrate with the first sensor;
- detecting the mark on the substrate with the second sensor;
- with an encoder to detect advancement of the substrate and a scaling measurement correction module, determining a measured distance between the sensors based on detection of the mark at each sensor;
- with the measurement correction module, comparing the measured distance to the calibrated sensor distance and determining a correction factor based on the comparison of the measured distance to the calibrated sensor distance;
- and
- with the measurement correction module, adjusting operation of the web printing press based on the correction factor.
Dependencies are inferred from the claim text.