Method and apparatus for pneumatic guiding and capturing strand fibers on ring frame

A method for pneumatic guiding and capturing strand fibers, comprising steps of:

• respectively fixing a pneumatic guiding and capturing apparatus in front of each front roller nip of each drawing system of a ring frame, wherein the pneumatic guiding and capturing apparatus is mounted on sucking pipes (8) of the ring frame, the pneumatic guiding and capturing apparatus comprises a capturing holder (3), an air passage communicator (4), and a movable cover (1);
• wherein a holder groove (6) is provided on the capturing holder (3), a horn end thereof is an inlet, and an extending end thereof is an outlet;
• a wind in-taker is provided inside the capturing holder (3), in-take openings (7) of the wind in-taker are narrow-shaped and are symmetrically arranged on an internal wall of the holder groove (6);
• and an axis of a wind in-taker portion near the in-take openings (7) is corresponding to an inlet axis of the holder groove (6);
• wherein the air passage communicator (4) comprises a base (5) and a cover installing platform (2);
• the base (5) and the cover installing platform (2) are integrated, the cover installing platform (2) is aside the base (5);
• a tunnel is provided inside the base (5), a top end of the base (5) is a concave base;
• the capturing holder (3) is inserted into the top end of the base (5);
• the wind in-taker inside the capturing holder (3) communicates with the tunnel inside the base (5);
• the movable cover (1) is mounted on the platform of the cover installing platform (2) by a hinge;
• a hinge shaft of the hinge is parallel to the axis of the holder (6);
• and the base (5) communicates with the sucking pipe (8);
• wherein after being drafted by the drawing system on the ring spinning machine, the fiber strand is pressed with a shape of flat ribbon to form a ribbon-like fiber strand;
• the ribbon-like fiber strand is then outputted from the front roller nip to form a spinning strand;
• the outputted spinning strand is then moved into the capturing holder (3) through the inlet of the holder groove (6), wherein negative pressure wind of the sucking pipe (8) generates a negative pressure flow inside the holder groove (6) through the tunnel of the base (5), the wind in-taker of the capturing holder (3) and the in-take openings (7), for guiding edge fibers of the ribbon-like strand to closely contact with a main body of the spinning strand inputted into the capturing holder (3);
• in the capturing holder (3), before the edge fibers of the ribbon-like strand, which are separated from the front roller nip, enter the in-take opening (7), cohering the strand edge fibers with hairs on the rotating surface of the spinning strand for being partly captured by the stem of the spinning strand;
• leaving the rest part of the edge fibers protruding out of the spinning strand surface to form hairiness;
• wherein when the spinning strand moves to a section of the holder groove (6) corresponding to a position of the in-take opening (7), the hairiness on the spinning strand surface is stretched by a negative pressure of the in-take opening (7), so as to closely contact with the wind in-taker and the internal wall of the holder groove (6);
• holding the hairiness by friction of the internal wall, and tightly wrapping onto the rotating stem of the spinning strand for fixing the ribbon-like strand edge fibers captured and eliminating the hairiness on the surface of the spinning strand;
• outputting the spinning strand from the outlet of the holder groove (6) to form a spun yarn, and finally winding the spun yarn onto a yarn bobbin by a pigtail guider, a steel ring and a traveler.