The invention relates to a rotator ( 10 ) for jib-carried tools ( 1 ), for example tree working units, wherein the rotator ( 10 ) includes a stator ( 20 ) and a rotor ( 30 ), wherein the rotator ( 10 ) is connected to a tip ( 2 ) of the jib or arm ( 3 ) and to the tool ( 1 ). The rotator ( 10 ) has or includes in its surroundings means ( 70, 71 ) for determining the relative position of rotation between rotor ( 30 ) and stator ( 20 ). The means for determining the relative position of rotation comprises a pulse emitter ( 70 ) and a number of pulse generating elements ( 71 ), such as grooves or teeth. Limitation of the angle through which the rotator ( 10 ) can turn and control of the direction of rotation prevents, for instance, hoses and/or cables ( 7 ) from twisting or rotating away from their respective connections, while enhancing the extent to which automation can be achieved at the same time.
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