Method and apparatus for controlling veneer lathe knife...

B - Operations – Transporting – 27 – L

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B27L 5/00 (2006.01) B23Q 15/013 (2006.01) B26D 7/26 (2006.01) B27L 5/02 (2006.01) B27L 5/08 (2006.01)

Patent

CA 2140200

A method of controlling the clearance angle of a veneer lathe knife in a veneer lathe having a knife holder beam rotatably mounted on a knife carrier. The beam's vibration frequency is continuously measured and compared with a stored representation of a vibration frequency range (about 50-200 Hz.) characteristic of disruption of the veneer peeling operation. If the comparison reveals that the measured vibration frequency is within the characteristic disruptive range, the beam is rotatably adjusted until the comparison reveals that the measured vibration frequency no longer lies within the disruptive range. Usually, the adjustment accelerates lowering of the beam in order to make the knife clearance angle less positive.

Méthode de contrôle de l'angle de dégagement d'un couteau de dérouleuse muni d'une poutrelle porte-couteau montée par une articulation sur un porte-couteau. La fréquence de vibration de la poutrelle est mesurée continuellement et comparée à une représentation inscrite en mémoire de la gamme des fréquences de vibrations (environ 50-200 Hz) susceptibles de provoquer des perturbations pendant l'opération de déroulage. Si cette comparaison indique que la fréquence des vibrations mesurées se situe dans la gamme des fréquences de perturbation, la poutrelle subit par rotation un ajustement jusqu'à ce que la mesure de comparaison révèle que la fréquence des vibrations mesurées n'est plus comprise dans cette gamme. En général, cet ajustement consiste à accélèrer l'abaissement de la poutrelle pour que l'angle de dégagement du couteau soit moins positif.

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