Method and system for detecting the position of an edge of a...

Details Method and system for detecting the position of an edge of a... Method and system for detecting the position of an edge of a...

2006-07-11

2006-07-11

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C356S637000, C356S429000, C250S239000

Reexamination Certificate

active

07075099

ABSTRACT:
A method and system for determining the lateral position of an edge of a web are disclosed. The system includes an array of light transmitting elements and a corresponding array of lenses and an array of light receiving elements and a corresponding array of lenses. The light transmitting elements are each paired with a light receiving element and the light transmitting elements each transmit a beam of light energy towards the corresponding receiving element. The beams of light can be occluded by a web passing between the transmitting elements and the receiving elements, thereby reducing the light received by the receiving elements. The receiving elements can generate a signal that is proportional to the amount of they receive, and a controller can be used to determine the lateral position of an edge of the web in response to the signals generated by the receivers. A compensation light beam can be employed to enable the controller to compensate for several factors that can affect measurement accuracy.

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