Abstract: At least two longitudinally spaced and axially adjustable anti-friction bearings are provided on a support and each of these has an inner and an outer race. A spindle is rotatably journalled in these bearings and has one end adjacent one of the bearings. The spindle is subject to the action of axial forces acting upon one end in direction toward another end of the spindle which is adjacent the other bearing. A pressure-exerting arrangement adjacent the other end serves to exert upon the other bearing a counter force acting in direction towards the one end of the spindle and tending to shift the spindle counter to the axial forces, and a transmitting arrangement transmits the counter force to the outer race of the one bearing to adjust the same axially relative to the spindle in accordance with the shifting of the latter.