App185 en optical-sensors-side-trimming-systems-saw-mills

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  • 1. A185_eLaser displacement sensorsoptoNCDTOptical sensors in side trimming systems of saw millsIn a saw mill, the tree trunk is stripped of its bark andthen separated into planks using a gate saw, circularsaw or band saw. These planks still have a so-calledwane (waney edge) on their narrow sides - the originalsurface of the circular tree trunk. The wanes should beremoved in the following side trimming system. Depen-ding on the position of the plank in the original tree trunk,the wane can be flatter or steeper and the plank is broa-der or narrower. If as large a yield as possible needs tobe achieved during side trimming, the width of the wanemust be determined, so that this can be sawn off at theappropriate width. If too much is sawn off, valuable ma-terial is wasted; on the other hand, if too little is removedthere are still residues of wane on the finished board.The company Esterer WD from Altötting ini Germany isusing the optoNCDT1401 laser sensor for this task. Par-ticularly when wood is wet it has a shiny surface, which Requirements for the measuring system:conventional optical sensors have difficulties measu- - Fast profile measurementring. Therefore, optoNCDT sensors from Micro-Epsilon - Analogue outputare used for the Combimes side trimming system. The - Low cost solution for optimum side trimmingplanks arrive horizontally in the side trimming systemand are measured. Every 30cm to 50cm, an optoNCDT Ambient conditions:1401 sensor is positioned, which has a 200mm measu- - Room temperaturering range and measures the profile of the cross-fed - Dusty (flying sawdust)plank. As standard, the measurement is made fromabove. The side trimming system can also be fitted with Sensor series used:optical sensors on the top and bottomside if required. In optoNCDT 1401 - 200this way, any position of the planks – wane at the top orbottom – is possible.MICRO-EPSILON A member of micro-epsilon groupKönigbacherstr. 15 Tel. +49 (0) 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 200094496 Ortenburg/Germany Fax +49(0) 85 42/1 69 90 www.micro-epsilon.com Modifications reserved / 9781185-A020059FHF