SCREENING BUCKET FOR A WORK MACHINE

摘要

A screening bucket (1; 100) comprises a support structure which can be secured to the moving arm of an operating machine, a screening drum (5; 50) secured to that structure (2) so that it may rotate about an axis (X) of rotation, a rotation unit for the screening drum (5; 50) and switching means (12) for the rotation unit which can switch the rotation unit between a first operating mode in which the screening drum (5; 50) is set in rotation at a substantially constant predetermined working speed and a second operating mode in which the rotation speed of the screening drum (5; 50) is reduced. The rotation unit further comprises detector means (15, 16) for detecting an angular position of the drum (5; 50), cooperating with the switching means (12) in such a way that the rotation unit is automatically brought into the second operating mode when the drum (5; 50) is situated in the region of at least one predetermined portion (A) of a revolution.