Method and apparatus for producing spun yarns of various constructions

摘要

A method and apparatus for producing spun yarns of various constructions which includes separating a potentially highly productive drafting stage from a spinning process and thereafter by the use of an apparatus which can be used to spin and ply two yarns while inserting an amount of twist of one sense into each yarn while concurrently plying those yarns with an equal amount of twist of the opposite sense. The apparatus can also be used to spin singles yarns while concurrently inserting twist into that yarn in a two-for-one mode. The yarns can be two twistless staple yarns or a singles yarn which is spun and plied with a two-fold yarn to produce a three-fold yarn structure. The twist in the three singles components of the three-fold yarn structure can be equal in magnitude and sense while the plying twist between the three singles yarns can be equal in magnitude and opposite in sense to the twist in the singles yarns. The method can produce yarns in which the singles and plying twist senses can be twist-on-twist, twist-against-twist, or a combination of these geometries. The raw material supplied to the apparatus can be packages of twistless yarns such as the slubbings produced on a woollen carding machine, or twistless yarns such as those in which fibre cohesion is achieved by means of a weak adhesive or by consolidating the fibres in a rubbing process. The apparatus can be used to perform the function of a conventional two-for-one twisting machine or to combine conventionally spun yarns into various complex structures while simultaneously modifying their individual twists in the initial state.