Web longitudinal position sensor
First Claim
1. A method to determine the position of an elongated web, comprising:
- sensing one or more continuous fiducial marks disposed longitudinally on at least a portion of the web, wherein sensing the one or more continuous fiducial marks comprises sensing a sine fiducial mark and a cosine fiducial mark disposed longitudinally and deposited on the web; and
determining a longitudinal position of the web based on the fiducial marks.
1 Assignment
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Accused Products
Abstract
Methods and systems for determining longitudinal position of an elongated web are described. Sensors are used to detect one or more substantially continuous fiducial marks disposed longitudinally on the web. The sensors generate signals associated with the fiducial marks. A position detector receives the signals and determines a longitudinal position of the web using the sensor signals. The fiducial marks may be periodic fiducial marks, such as sine and/or cosine marks on the web and/or may be piecewise continuous marks. The coarse longitudinal position of the web can be determined based on periodically recurring features of the fiducial marks. The fine longitudinal position can be determined based on continuous portions of the fiducial marks between the periodically recurring features.
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Citations
32 Claims
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1. A method to determine the position of an elongated web, comprising:
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sensing one or more continuous fiducial marks disposed longitudinally on at least a portion of the web, wherein sensing the one or more continuous fiducial marks comprises sensing a sine fiducial mark and a cosine fiducial mark disposed longitudinally and deposited on the web; and determining a longitudinal position of the web based on the fiducial marks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 32)
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12. An apparatus for determining a position of an elongated web having a continuous sine fiducial mark and a continuous cosine fiducial mark disposed in a longitudinal direction and deposited on at least a portion of the elongated web, the apparatus configured for use with such an elongated web and comprising:
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one or more sensors configured to sense both the sine fiducial mark and the cosine fiducial mark, the one or more sensors configured to generate signals corresponding to the fiducial marks; and a position detector configured to receive the sensor signals and to determine a longitudinal position of the web using the sensor signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification