Forage harvester having automatic shear bar adjustment mechanism including safety features.

摘要

A forage harvester is provided having an adjustable shear bar (102) cooperable with a rotatable cutter head (100) to cut material passing therebetween, motor means (110, 112) for moving the shear bar (102) towards and away from the cutter head (100) and a control system (116) operable to energise the motor means (110, 112) for automatically adjusting the clearance between the shear bar (102) and the cutter head (100).

The control system (116) comprises means for sensing the magnitude of current flowing through the motor means (110, 112) and de-energising these motor means (110, 112) if the magnitude of current is above or below a predetermined range for a predetermined interval of time.