Leroy F Curtis

US Patent:

53790278, Jan 3, 1995

Filed:

Apr 15, 1993

Appl. No.:

8/046167

Inventors:

Leroy F. Curtis - Calais ME

Assignee:

Georgia-Pacific Corporation - Atlanta GA

International Classification:

G08B 2100
B65G 4300

US Classification:

340676

Abstract:

A proximity sensor adapted to sense the presence of metal is located in a processing system for producing pressed board product, such as oriented strand board (OSB), or the like, at a position to detect the presence or absence of product on a metal transfer screen when it is delivered to the unloader station. The sensor is carried by a floating support device that maintains the operating face of the sensor level. The operating face of the sensor is disposed a predetermined distance above the bottom of the support device whereby elevation of the support device and the mounted sensor by a passing board product displaces the sensor beyond its effective detection range to indicate the desired presence of product. Alternatively, when product is missing, the electric signal emitted by the sensor may be operatively connected to a sensible alarm or may be operative in the system control to automatically terminate system operation so that the detected malfunction can be corrected.