Auxiliary pneumatic device

Auxiliary pneumatic device for aspirating a running yarn during manipulations on a textile machine having a plurality of yarn treatment posts, at least one tube extending along the machine length, a vacuum source connected with said tube so that air is led through the tube towards the vacuum source, the tube being provided at each treatment post with one slot-like opening and one coaxial tube portion tightly fitting the tube, each said tube portion being provided with a central opening and being slidable on the tube about the tube axis to partially close its respective opening, and an abutment being provided on said tube to limit the movement of each said tube portion.

Auxiliary pneumatic device for aspirating a running yarn during manipulations on a textile machine having a plurality of yarn treatment posts, at least one tube extending along the machine length, a vacuum source connected with said tube so that air is led through the tube towards the vacuum source, the tube being provided at regular distances with openings, and suction elements each consisting of a body tightly fitting the tube, each said body being slidable relatively to the tube and fixable in a predetermined position relative to a respective tube opening to control the size of said opening within a range from full open to a predetermined minimum opening, each said slidable body being provided with a cylindrical part the axis of which extends radially with respect to the tube, said cylindrical part having a bore the axis of which extends parallel to the cylinder axis and on the cylindrical part of which there is provided a cap-like cover with a circular opening, said opening being eccentrically arranged with respect to the center of said cover.

Auxiliary pneumatic device for aspirating a running yarn during manipulations on a textile machine having a plurality of yarn treatment posts, at least one tube extending along the machine length, a vacuum source connected with said tube so that air is led through the tube towards the vacuum source, the tube being provided at each treatment post with one slot-like opening and one coaxial tube portion tightly fitting the tube, each said tube portion consisting of aluminum or of an aluminum alloy with a hardanodized surface and comprising at one end a notch-like recess, and abutment means positioned on the tube to limit the movement of each said tube portion between positions wherein the respective tube opening is full open and wherein there remains a reduced opening formed by said opening and said notch-like recess.