Method and spinning machine for the production of core yarn

A spinning machine for producing a core yarn, comprising:

• a drafting frame having a plurality of roller pairs traversed in succession by a fiber slubbing and subjecting said fiber slubbing to drafting during passage through said drafting frame, said drafting frame having at an output thereof a compaction device, said compaction device comprising a driven endless surface formed with a perforation extending around a periphery of said compaction device, a suction source connected to said perforation to apply suction therethrough to said slubbing, thereby drawing fibers of said slubbing together, and at least one roller juxtaposed with said surface whereby said slubbing passes between said roller and said surface;
• a core thread supply for feeding a core thread into said slubbing centrally of said perforation and directly on said surface whereby said core thread is enveloped in said slubbing;
• and
• a spinning frame downstream of said drafting frame and receiving the slubbing with the core thread enveloped therein for spinning the slubbing and the core thread enveloped therein into a core yarn.