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A typical application for the MiniCoders from Lenord + Bauer can be found in forestry machines
from a leading Finnish manufacturer. The machines, known as harvesters, fell and process trees
using the cut-to-length method. The harvester head grips the trunk at its base, fells the tree then
draws the trunk past integrated blades to de-branch it. As the trunk returns though the harvester
head it is cut it to the lengths required for later use. This method offers a high productivity by
reducing the handling and facilitating the mobility of the machines as well as enabling a
documentation of the wood volume processed.
For the correct length measurement despite frequent back and forth movement of the trunk,
direction detection is necessary. Due to the compact design of the harvester head, space for a
measuring system is restricted. The MiniCoder GEL 248 from Lenord + Bauer provides the solution.
Approximately the size of a walnut the MiniCoder detects a rotating toothed target wheel attached
directly to a roller which runs on the trunks. The MiniCoder contains two pre-set sensors in one
housing which provide two incremental outputs phase shifted by 90º allowing for length and
direction evaluation in the control electronics. The flange mounting enables a simple and fast
installation with practically no adjustment necessary.
The MiniCoder are ideally suited for coping with the harsh environment in a forest with uneven
or non-existing tracks and changing climatic conditions. The contact-less magnetic measuring system
together with the electronic circuitry are full potted in a metal housing. They are therefore shock
and vibration proof and are not affected by moisture, dirt or oily grime. The reliability of the
MiniCoder used in harvesters in forest locations where the nearest workshop is a long way off can
well be appreciated.
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