CA2338976A1 - Closed-loop wood log rotation system - Google Patents
Closed-loop wood log rotation system Download PDFInfo
- Publication number
- CA2338976A1 CA2338976A1 CA 2338976 CA2338976A CA2338976A1 CA 2338976 A1 CA2338976 A1 CA 2338976A1 CA 2338976 CA2338976 CA 2338976 CA 2338976 A CA2338976 A CA 2338976A CA 2338976 A1 CA2338976 A1 CA 2338976A1
- Authority
- CA
- Canada
- Prior art keywords
- ball
- loop
- closed
- angle
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
- B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
- B27B31/06—Adjusting equipment, e.g. using optical projection
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
Abstract
1.0 PROBLÉMATIQUE La rentabilité financière et environnementale d'une usine de sciage dépend en bonne partie de la valeur ajoutée à la matière première qui est des billes d e bois. Il est donc important de maximiser le volume de produit transformé pour chaque bille. C'est ce que l'on nomme le rendement matière. Pour ce faire, les systèmes de sciage actuels lisent la forme de chaque bill e à l'aide d'un scanner, ajustent les outils de coupe et tournent la bille à l'angle qui sera le plus favorable au rendement matière. Cependant, les imperfections de forme des billes (noeuds, trous, ovalité, etc.) limitent la précision de la rotation. Les pertes dues à cette imprécision peuvent varier de 5% à 20% sur le rendement matière.1.0 PROBLEM The financial and environmental profitability of a sawmill depends in large part on the value added to the raw material which is logs. It is therefore important to maximize the volume of product processed for each log. This is called material yield. To do this, current sawing systems read the shape of each bill using a scanner, adjust the cutting tools and turn the log at the angle that will be most favorable to the material yield. However, imperfections in the shape of the balls (knots, holes, ovality, etc.) limit the precision of the rotation. The losses due to this imprecision can vary from 5% to 20% on the material yield.
Description
2.0 DESCRIPTION DE L'INVENTION
L'invention en question s'applique au sciage de billes de bois et porte sur la rotation des billes avant sciage.
Les systèmes de rotation actuels des billes fonctionnent à l'aveugle. C'est-à-dire qu'ils tournent la bille d'un certain angle, préalablement calculé par un analyseur, sans vérifier si la position recherchée a été atteinte. L'invention proposée permet d'effectuer une vérification de la position pendant la rotation.
II s'agit d'un système de caméras et d'analyseur qui peut lire l'angle de la bille en temps réel pendant la rotation. On peut donc avoir un système en boucle fermée. La commande de mouvement au tourne-bille est en fonction de la lecture de l'angle. Lorsque la bille est au bon angle, l'analyseur ordonne l'arrêt du mouvement. Si l'angle de la bille change pendant son avance dans la machine, des corrections peuvent être faites avant que les outils de coupe ne commencent leur travail.
15 janvier 2001 Jean-Pierre Perreault G.. sAwau ~ p Demande de brevet Système de rotation de bille de bois en boucle fermée 2.0 DESCRIPTION DE L'INVENTION (SUITE) Le système peut fonctionner de deux façons : La première consiste à lire la forme du bout de la bille lors de son passage dans le scanner et à comparer cette image avec celle lue lors de la rotation pour en déduire l'angle. On doit alors compter sur les défauts de la bille comme points de repère pour détecter l'angle. Voir la figure 1.
Pour les billes ayant peu de défauts significatifs, il est possible d'ajouter un système de marquage des billes. La marque ainsi produite pourra facilement être reconnue par la ou les caméras. Voir la figure 2.
4 ~..:_ _ . T,. 2.0 DESCRIPTION OF THE INVENTION
The invention in question applies to sawing logs and relates to the rotation of the logs before sawing.
Current ball rotation systems operate blind. That is, say that they rotate the ball by a certain angle, previously calculated by a analyzer, without checking whether the desired position has been reached. The invention proposed allows to perform a position check during the rotation.
It is a camera and analyzer system that can read the angle of the ball in real time during rotation. So we can have a system in closed loop. The motion control with the ball turn is in operation of the angle reading. When the ball is at the right angle, the analyzer orders the movement to stop. If the angle of the ball changes during advance in the machine, corrections can be made before the cutting tools don't start working.
January 15, 2001 Jean-Pierre Perreault G .. sAwau ~ p Patent application Ball rotation system closed loop wood 2.0 DESCRIPTION OF THE INVENTION (CONTINUED) The system can operate in two ways: The first is to read the shape of the tip of the ball as it passes through the scanner and compare this image with the one read during rotation to deduce the angle. We must then rely on ball defects as benchmarks for detect the angle. See figure 1.
For balls with few significant defects, it is possible to add a ball marking system. The brand thus produced can easily be recognized by the camera (s). See figure 2.
4 ~ ..: _ _. T ,.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2338976 CA2338976A1 (en) | 2001-02-27 | 2001-02-27 | Closed-loop wood log rotation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2338976 CA2338976A1 (en) | 2001-02-27 | 2001-02-27 | Closed-loop wood log rotation system |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2338976A1 true CA2338976A1 (en) | 2002-08-27 |
Family
ID=4168466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2338976 Abandoned CA2338976A1 (en) | 2001-02-27 | 2001-02-27 | Closed-loop wood log rotation system |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2338976A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006060865A1 (en) * | 2004-12-09 | 2006-06-15 | Radial Coproation Limited | Log loading for timber processing |
WO2008049502A1 (en) * | 2006-10-25 | 2008-05-02 | Esterer Wd Gmbh | Method and device for fragmenting tree trunks |
EP2263841A1 (en) * | 2009-06-18 | 2010-12-22 | UPM-Kymmene Corporation | Method and apparatus for measuring the rotation of a log and for correcting the rotation error |
EP1858675A4 (en) * | 2005-03-17 | 2013-10-30 | Us Natural Resources | Log rotation and verification system and method |
-
2001
- 2001-02-27 CA CA 2338976 patent/CA2338976A1/en not_active Abandoned
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006060865A1 (en) * | 2004-12-09 | 2006-06-15 | Radial Coproation Limited | Log loading for timber processing |
CN101115598B (en) * | 2004-12-09 | 2011-04-20 | 辐形技术有限公司 | Log loading for timber processing |
EP1858675A4 (en) * | 2005-03-17 | 2013-10-30 | Us Natural Resources | Log rotation and verification system and method |
EP3144100A1 (en) * | 2005-03-17 | 2017-03-22 | Usnr, Llc | Log rotation and verification system and method |
EP3144100B1 (en) | 2005-03-17 | 2019-03-06 | Usnr, Llc | Log rotation and verification system and method |
EP3524388A1 (en) * | 2005-03-17 | 2019-08-14 | Usnr, Llc | Controller for controlling a log rotator and log rotator system comprising such a controller |
WO2008049502A1 (en) * | 2006-10-25 | 2008-05-02 | Esterer Wd Gmbh | Method and device for fragmenting tree trunks |
EP2263841A1 (en) * | 2009-06-18 | 2010-12-22 | UPM-Kymmene Corporation | Method and apparatus for measuring the rotation of a log and for correcting the rotation error |
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Legal Events
Date | Code | Title | Description |
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FZDE | Dead |