Patent ID: 6956197

Claim:
A device for detection and removal of one or more boards on an elevator for separation of boards collected from a magazine of boards, said elevator comprising a frame for supporting two or more carrier chains, upper and lower pulley wheels, and carrier chains about said upper and lower pulley wheels, carriers for lifting the boards from the magazine, said elevator including removal devices for removing the boards from the carriers, at least one laser light detector arranged on the upward feeding side of the elevator for directing laser light towards long sides of the boards and receiving reflected laser light, a computer for receiving and processing signals received from the detector and a removal device controlled by the computer for removing boards if the signals processed in the computer indicate that the distance between each laser light detector and the boards gradually decreases during the passage of the boards past the first detector, said device further including at least two or more first photocells positioned along a horizontal line on the upward feeding side of the elevator to determine whether one or more boards have been lifted with one in front of the other on one row of equivalently placed carriers and an acceleration device to remove the one or more boards lifted with one in front of the other; and two or more second photocells disposed along a horizontal line on the upward feeding side of the elevator to determine whether or not one or more boards have been lifted tilted.