Device and method for producing fancy yarns

A machine for producing a fancy yarn, the machine comprising:

• a feed path for at least one yarn from at least one feed spool to a winding bobbin;
• and,
• at least one device for generating variable drawing effects on the at least one yarn, wherein along said feed path there is arranged at least a yarn processing member and the at least one device, and the at least one device comprises:
• a first roller rotatable about a first rotation axis, the first roller having a first axial end and a second axial end;
• a second roller rotatable about a second rotation axis, parallel to the first rotation axis, the second roller having a first axial end and a second axial en& wherein the first roller and the second roller are in contact with each other along a nip and define between them, in a mutual contact area, a yarn passage extending through said nip;
• and wherein at least one of said first roller and second roller is motorized;
• and
• at least a first guide member and a second guide member which define a feed path for at least one yarn, said feed path extending through the nip between the first roller and the second roller;
• wherein the first guide member is arranged upstream of the nip with respect to a feed direction of the yarn along said feed path, and the second guide member is arranged downstream of the nip with respect to the feed direction of the yarn along said feed path;
• wherein the first guide member and the second guide member are adapted to move synchronously with one another with respect to said first roller and second roller in a direction approximately parallel to the first rotation axis and to the second rotation axis, said movement being such as to take the yarn outside the nip between the first roller and the second roller by moving the yarn beyond at least one of said first axial ends and said second axial ends of the first roller and second roller.

A method for producing a fancy yarn, comprising the steps of:

• feeding at least one yarn along a feed path between a first roller rotating about a first axis, and a second roller, rotating about a second axis approximately parallel to the first axis, said first roller and second roller being in contact with each other and defining between them a yarn passage;
• wherein at least one of said first roller and second roller is motorized;
• guiding the yarn by means of a first guide member upstream of the yarn passage with respect to a feed direction of the yarn;
• guiding the yarn by means of a second guide member downstream of the yarn passage with respect to the feed direction of the yarn;
• moving the first guide member and the second guide member simultaneously in a direction substantially parallel to the rotation axes of the first roller and of the second roller while the yarn advances along the feed path, such as to temporarily move the yarn outside the yarn passage between the first roller and the second roller and returning the yarn inside the yarn passage between the first roller and the second roller and imparting on the yarn a variable drawing effect therewith.