Device and method for producing compound yarn by compact siro spun

The invention relates to a device and method used compact Siro spinning to produce folded yarn. The device includes ingot crane, two parallel rove, back leather roller, traversing guide trumpet port, draft field, front leather roller, plug-in unit sucking sheet, draught-deflector presser bit, gathering roller, guide leather roller, guide wire, traveler, spindle, and ring cop. The method includes the following steps: making two roves enter the draft field through traversing guide trumpet port, lead out by gathering roller and guide leather roller; forming V shape arrange in gathering area with compact structure without spinning triangular space; twisting to roll around the ring cop. The invention has simple structure, convenient operation, can solve the problem of instable spinning performance.