Spinning device for open-end spinning

A spinning device for open-end spinning a fiber material infed into said spinning device in order to form a spun yarn, said spinning device comprising:

• a spinning rotor receiving the fiber material;
• said spinning rotor defining a predetermined rotational axis and being rotatable about said predetermined rotational axis;
• rotary drive means for rotating said spinning rotor about said predetermined rotational axis;
• said spinning rotor, during an open-end spinning operation, forming a revolving yarn;
• a withdrawal arrangement receiving the revolving yarn from said spinning rotor and withdrawing the spun yarn formed during the open-end spinning operation;
• said withdrawal arrangement containing a substantially funnel-shaped withdrawal nozzle;
• said substantially funnel-shaped withdrawal nozzle possessing a substantially conical portion;
• at least one substantially spiral-shaped bead extending about said predetermined rotational axis of said spinning rotor at the substantially conical section of said substantially funnel-shaped withdrawal nozzle and slidingly contacted by said revolving yarn during the open-end spinning operation;
• said withdrawal arrangement further containing a twist blocking element;
• said twist blocking element possessing a withdrawal channel defining a lengthwise axis and communicating with said substantially funnel-shaped withdrawal nozzle at an end of such substantially funnel-shaped withdrawal nozzle which is disposed remote from said spinning rotor;
• at least one bead located in said withdrawal channel and extending at a predetermined inclination relative to said lengthwise axis of said withdrawal channel;
• said twist blocking element further containing an arcuately shaped withdrawal channel section of said withdrawal channel and which arcuately shaped withdrawal channel section is associated with a predetermined center of curvature;
• said at least one bead located in said withdrawal channel being disposed at the length of an arcuately shaped withdrawal channel section half of said arcuately shaped withdrawal channel section and which withdrawal channel section half faces said predetermined center of curvature;
• said spinning rotor, during said open-end spinning operation, forming the spun yarn with a twist in a predetermined twisting direction;
• and
• said at least one substantially spiral-shaped bead in said substantially conical portion of said funnel-shaped withdrawal nozzle and said at least one bead located in said arcuately shaped withdrawal channel section of said withdrawal channel, extending at a predetermined inclination relative to the spun yarn and which predetermined inclination substantially extends in the same direction as said predetermined twisting direction of said spun yarn.