Abrégé

The present invention relates to an arrangement and a method for monitoring progress of timber rotation before sawing machine in a sawmill. This aim is reached by providing a separate 3D-rotation scanner which identifies the previously 3D-scanned and measured log and which measures the rotation progress in the log turner in real time. Accordingly to the method, the already scanned and measured timber (log) is scanned again with additional 3D-rotation scanner and the newly scanned position of the timber is compared with the parameters of the previously scanned data and accordingly the process of the timber (log) rotation can be evaluated in real time. As a result, it is monitored if the timber (log) is turned into an optimized position before entering sawing machine and if there is a need of correction of the timber's (log's) position, the scanner will instruct the log turner or the operator to do so.

Classes IPC  ?

• B27B 31/06 - Systèmes de réglage, p.ex. par projection optique
• B27L 5/02 - Découpage de bandes à partir d'un tronc ou d'un billon animé d'un mouvement de rotation; Dérouleuse

Abrégé

The present invention relates to an arrangement and a method for scanning a piece of timber after sawing machine in a sawmill. Accordingly to the invention separate scanner is added after sawing machine. This 3D-block scanner can find optimal cutting solution for timber, measure thickness of timber (block) and its sideboard(s), measure rotation of timber during sawing, measure rotation angle of timber, measure alignment of timber.

Classes IPC  ?

• B23D 59/00 - Dispositifs annexes spécialement conçus pour les machines à scier ou les dispositifs de sciage
• B27B 1/00 - Méthodes pour débiter les troncs ou les grumes impliquant essentiellement le sciage

Abrégé

The present invention relates to a method and an arrangement for improving measuring quality, accuracy and reliability of line laser based scanners that are based on exact position and/or alignment of laser line. The invention relates in particular to the field of mechanical forest industry and improves the work of 3D-scanner based on triangulation principle. Image sensors are introduced and they are arranged so that laser light from light source goes directly into the sensors. The image sensors can detect the intensity and distribution of the light beam from the light source and can also detect if the light source needs maintenance or replacing or recalibrating before the quality of scanning deteriorates. The exact position of the light source can also be determined if its light beam will be driven directly to the image sensors which will facilitate the repositioning of the light source.

Classes IPC  ?

• G01B 11/24 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer des contours ou des courbes
• G01N 21/88 - Recherche de la présence de criques, de défauts ou de souillures
• G01B 11/25 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer des contours ou des courbes en projetant un motif, p.ex. des franges de moiré, sur l'objet