RS-Z uses 3D data from the log optimisation and additional measurements next to the log turner to enable automatic log turning and to improving its precision. The measurements by the log turner are made with two cameras equipped with linear laser technology, which returns a partial measurement of the shape of the log. This is to avoid major mechanical reconstructions.
The system receives the full 3D shape of the log from the log optimisation together with its optimsed log turning angle. The log is then measured again by the log turner and the system calculates how much the log has rolled between the different measurements. Together with the calculated roll amount and the optimsed log turning angle, the system calculates how much the log will have to be turned from its current position in order to achieve the initially calculated log turning angle. This enables automatic log turning even if the logs are rolling freely between the log optimisation and the log turner. Also, the system has the possibility to perform a correctional 2nd log turning to decrease the log turning error caused by the mechanical equipment. Regardless of if your line is straight or non-straight, RS-Z helps you to increase your profit.
RS-Z consists of two cameras with point laser technology. They are mounted so that the laser covers 75% of the log’s mantle surface, which is more than enough to calculate its rotation. The cameras are placed on each side over the log.
50-60 cm of the top of the log is measured next to the log turner, normally with a distance of 1 cm between each measured cross section. In this position, the log is expected to be at rest, i.e. not rotating. Then, the 1st log turning is calculated. The calculation is very fast and therefore it can be performed continously for each new cross section as the log travels through the measurement frame. If the line has vertical conveyors where the logs can exchange positions, a log match is performed so that the system is finding the correct log. If there is a log queue, e.g. 20 logs, a log turning result can be expected after approximately 100 milli seconds. If the system is configured to communicate with a PLC, a second log turning can be performed if the timing allows it and if there is enough log length remaining. When the PLC considers that the log has been turned, a signal is sent to RS-Z. Then, RS-Z can collect further cross section data when the log is at rest och then deliver yet another log turning result.
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