Method and installation for optimised automatic conversion of timber

According to the method, a starting point is established consisting of the list of dimensions and quantities of each of the preconverted units to be produced. After having measured the dimensions and the zones of defect 40 of a piece of timber 10, a corrected surface area is determined for each preconverted unit 111, 112, 121, 122, 123, which is equal to the actual surface area multiplied by a coefficient ki whose value depends on the difficulty of producing the preconverted unit, for the piece of timber 10, all the various possible cutting planes are established by calculating the total corrected surface area for each possible cutting plane, the cutting plane having the largest corrected surface is adopted, the starting point is updated and the coefficients ki are periodically readjusted as a function of the output speeds of the preconverted units. Application to the automatic conversion of pieces of wood such as timber or planks. SELON LE PROCEDE, ON ETABLIT UN LANCEMENT CONSTITUE PAR LA LISTE DES DIMENSIONS ET DES QUANTITES DE CHACUN DES PREDEBITS A PRODUIRE. APRES AVOIR MESURE LES DIMENSIONS ET LES ZONES DE DEFAUT 40 D'UN AVIVE 10, ON DETERMINE POUR CHAQUE PREDEBIT 111, 112, 121, 122, 123 UNE SURFACE CORRIGEE EGALE A LA SURFACE REELLE MULTIPLIEE PAR UN COEFFICIENT K DONT LA VALEUR DEPEND DE LA DIFFICULTE A PRODUIRE LE PREDEBIT, ON ETABLIT POUR L'AVIVE 10 L'ENSEMBLE DES DIVERS PLANS DE DEBIT POSSIBLES EN CALCULANT LA SURFACE CORRIGEE TOTALE POUR CHAQUE PLAN DE DEBIT POSSIBLE, ON RETIENT LE PLAN DE DEBIT PRESENTANT LA SURFACE CORRIGEE LA PLUS GRANDE, ON MET A JOUR LE LANCEMENT ET ON REAJUSTE PERIODIQUEMENT LES COEFFICIENTS K EN FONCTION DE LA VITESSE DE SORTIE DES PREDEBITS.APPLICATION AU DEBITAGE AUTOMATIQUE DE PIECES DE BOIS TELLES QUE DES AVIVES OU DES PLATEAUX.