Drying and gas or vapor contact with solids – Apparatus – Houses – kilns – and containers
Patent
1996-12-18
1997-10-21
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Houses, kilns, and containers
2502221, F26B 1900
Patent
active
056783221
ABSTRACT:
An end wall of a multi-conveyor wood veneer dryer includes a plurality of sight glasses that are vertically aligned with each other. Each sight glass is elevated just above a respective roller conveyor, with the conveyors being located in the dryer. A laser generator portion of a laser apparatus is positioned adjacent each sight glass outside the dryer, such that a laser beam is directed through each sight glass. Each laser apparatus includes a light detector for detecting reflected laser light. The preferred laser apparatus generates a distance signal representative of the distance between the generator and an object in the path of the laser beam, based on the period from when the beam was generated to when the reflected beam was received. Accordingly, when the veneer panels in a conveyor are moving properly through the dryer, the laser beam that is associated with the conveyor propagates to the wall of the dryer that is opposite the sight glasses, and the beam is reflected back to the receiver, with the apparatus indicating a distance equal to the length of the dryer. On the other hand, when the panels in a conveyor become jammed and consequently stacked up, the beam is reflected by one or more jammed panels, with the output of the laser apparatus indicating the distance from the laser generator to the jam.
REFERENCES:
patent: 4417406 (1983-11-01), Eibich
patent: 4544841 (1985-10-01), Bright et al.
patent: 5243183 (1993-09-01), Barron, Jr. et al.
patent: 5371583 (1994-12-01), Yamaguchi
patent: 5504346 (1996-04-01), Page et al.
patent: 5560410 (1996-10-01), Peacock
AKI Dryer Manufacturers, Inc.
Bennett Henry A.
Doster D.
Rogitz John L.
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