Abstract: A method and apparatus for measuring the length of fibers is provided. The method includes the steps of separating the fibers in order to obtain a fiber in single form. The method further involves passing the fiber by an optical measurement system that optically images the fiber. Another step includes calculating the length of the fiber by measuring an increment of the fiber in the x coordinate plane, the y coordinate plane, and the z coordinate plane. Also, the method involves repeating this step to obtain additional increment measurements. These measurements are placed into an equation to compute the length of the fiber. The apparatus for measuring the length of separated fibers from a fiber band includes an apparatus for separating the fiber from the fiber band. Further, a duct is provided for transporting the fiber. At least one camera is proximate to the duct for obtaining an image of the fiber, and a computer is connected to the camera.

Abstract: The spinning device for open-end spinning contains a withdrawal nozzle with a substantially spiral-shaped bead or ridge as well as a twist blocking element or twist trap containing beads or ridges and provided in a thread withdrawal passage. The inclinations of the substantially spiral-shaped bead or ridge and of the beads or ridges in the withdrawal nozzle and in the withdrawal passage, respectively, substantially extend in the same direction or sense as the twist of the yarn. This device permits increasing the stability of the yarn, reducing the number of thread breakages and/or increasing the production rate. The yarn characteristics are less dependent upon the fiber material and the yarn type. In particular, the production of yarns with a soft handle is rendered possible at higher rotor speeds than heretofore possible.