Belt type false twister

A spun yarn producing apparatus comprising a drafting device having back rollers, middle rollers each having an apron, and front rollers, a first false twister including an air injection nozzle, and a second false twister to impart a turning motion to a fiber bundle in an opposite direction to that of the first twister, characterized in that said second twister is a belt type false twister for false-twisting fibers by nipping the fibers at a nipping area between two crossed endless belts travelling in directions different from each other, wherein a pair of pulleys with said endless belts entrained thereabout are mounted fixedly and that in a position offset from said nipping area of one endless belt there is provided a pressing roller device which urges said one endless belt toward the other endless belt to provide an inclined nipping pressure across the nipping area during a false-twisting operation.

A belt-type false-twister device for false-twisting fibers, comprising:

• a first belt defining a first belt path;
• a second belt defining a second belt path arranged to cross the first belt path and to provide a nipping area for nipping fibers, said nipping area being defined by a portion of each belt path which is crossed by the other belt path, said nipping area having a first edge and a second edge opposite to the first edge;
• nipping pressure providing means for providing a nipping pressure variance across said nipping area during a false twisting operation with a relatively low nipping pressure occurring at said first edge of the nipping area and a greater nipping pressure occurring at said second edge of the nipping area.

A belt-type false-twister device for false twisting fibers nipped in a nipping area between first and second endless belts, the first and second endless belts defining first and second belt paths, respectively, arranged to cross each other and provide a nipping area defined by a portion of each belt path which is crossed by the other belt path, said device comprising:

• a belt contacting device arranged to contact the first endless belt in the first belt path adjacent one side of the nipping area and offset from the nipping area;
• forcing means, operatively connected with said belt contacting device, for forcing the first belt toward the second belt and for providing a nipping pressure variance across the nipping area during a false twisting operation with a greater nipping pressure occurring in the nipping area closer to said one side and a lower nipping pressure occurring at the side of the nipping area which is opposite to said one side.