TACHOGRAPH WITH PHASE CORRECTION

摘要

A tachograph has a chart carrier 2 such as a turntable, driven by a motor 9, such as a stepper motor and the turntable is synchronised with the time shown on a clock 8. Means 16-18 are provided for correcting any phase error between the turntable position and the actual time, which means rotates the turntable to the correct position at which markings on a tachograph chart correspond with the time shown on the clock. Phase displacement can occur as a result of disengaging the drive from the turntable, e.g. when inserting the chart.