Method and device for manufacturing a twisted yarn in an integrated spin-twisting process according to the two-for-one twisting method from dissolved fiber material

A spinning and twisting device comprising:

• a spindle rail;
• at least one spindle comprising a spindle rotor rotatably connected to said spindle rail, an interior casing surrounding said spindle rotor coaxially, and an exterior housing enclosing said interior casing;
• said spindle rotor comprising a hollow spindle axle and a yarn guide channel connected to said hollow spindle axle so as to extend radially outwardly from said hollow spindle axle;
• a centering element positioned above said hollow spindle axle on an extension of the axis of rotation of said hollow spindle axle;
• at least two rotor spinning devices positioned within said interior casing;
• a device for feeding individual staple fibers to said at least two rotor spinning devices, wherein the individual staple fibers are spun to spun yarns in the rotor spinning devices, guided through said hollow spindle axle and through said yarn guide channel to the exterior of said interior casing and to said centering element while forming a yarn balloon between said yarn guide channel and said centering element;
• a fiber material supply channel positioned within said interior casing for each one of said rotor spinning devices for feeding fiber material to each one of said rotor spinning devices;
• each one of said fiber material supply channels having an inlet opening at the outer wall of said interior casing;
• a fiber material feed tube located in said exterior housing for each one of said fiber material supply channels for feeding fiber material to each one of said fiber material supply channels, said fiber material feed tubes having an outlet opening positioned at an inner wall of said exterior housing;
• a spun yarn removal tube for each one of said rotor spinning devices for guiding the spun yarns from said rotor spinning devices to said hollow spindle axle where a twisted yarn is formed from the spun yarns;
• a rotating component arranged coaxially to said hollow spindle axle between said interior casing and said exterior housing and rotating with the yarn balloon, said rotating component comprising an integral yarn guide element for guiding at least over a portion of the height of the yarn balloon the twisted yarn;
• said rotating component comprising two annular members positioned opposite one another so as to delimit therebetween an annular space into which said inlet opening of said fiber material supply channels and said outlet opening of said fiber material feed tubes open;
• and
• said rotating component further comprising at least one connecting element for connecting said two annular members, said connecting elements extending through said annular space, wherein said integral yarn guide element extends through one of said at least one connecting elements.