Microprocessor-controlled apparatus for detecting and guiding a

Details Microprocessor-controlled apparatus for detecting and guiding a Microprocessor-controlled apparatus for detecting and guiding a

1989-03-23

1990-01-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, G01N 2186, G01V 904

Patent

active

048915289

ABSTRACT:
An apparatus for detecting and guiding a web includes a web scanner bar unit that extends across the entire width of the web path for controlling a steering mechanism to maintain a more precise edge and/or center alignment. The web scanner bar unit is formed of an infrared light-emitting diode array and a phototransistor array formed on opposite sides of the web. A microprocessor-based controller unit is provided for controlling the operation of the web scanner bar unit to form right and left eyespots in order to determine the respective right and left edges of the web. Further, the web scanner bar unit is capable of detecting a break in the intermediate area of the web.

REFERENCES:
patent: 4341453 (1982-07-01), Rubin
patent: 4728800 (1988-03-01), Surka
patent: 4795913 (1989-01-01), Blessing et al.

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