Patent ID: 7165740

Claim:
Automatic service trolley for spinning units of open-end spinning machines for carrying out intervention cycles for starting, for reattachment of thread and lifting of completed cones of thread on individual spinning units, said trolley carrying on-board members or groups of members dedicated to single or multiple operations of the various cycles, as well as a device for controlling and positioning that determines the position, with respect to such members of the trolley, both of an auxiliary thread (A), which is adopted at a new quill ( 28 ) by the service trolley, and of the thread produced (F) that reaches a cone ( 25 ), characterized in that said device ( 31 ) for controlling the thread (A, F) consists of a worm screw ( 32 ), with a horizontal axis parallel to the front of the spinning machine, equipped with a cantilevered support arm ( 33 ) that allows it to be lowered or raised by rotation about a horizontal axis ( 34 ) parallel to the front of the spinning machine, the worm screw ( 32 ) being actuated into commanded clockwise/anticlockwise rotation by a motor ( 35 ), and the arm ( 33 ) also being actuated into rotation take up controlled angular positions that determine the level of the axis of the screw ( 32 ), and with it they determine the level at which the thread is carried, whereas the thread itself is engaged in the recess of the threading of the worm screw ( 32 ) and is transported in it by its rotation, which determines its axial coordinate, said automatic service trolley further characterized in that a deviator plate ( 36 ) in the form of a concave hut is fixed onto the support arm ( 33 ), with an apex ( 37 ) and a fold ( 38 ) that raises its external profile ( 39 ), said deviator plate being integral with the worm screw ( 32 ).