Method and apparatus for commencing the yarn forming operation of a fasciated yarn

Method for commencing a yarn forming operation of a fasciated yarn comprising a twistless core bundle of staple fibers and outside fibers wrapped around said core bundle of fibers by an apparatus provided with a mechanism for supplying a bundle of fibers, a mechanism for forming said yarn from a bundle of fibers supplied thereinto from said supply mechanism and a mechanism for taking up said yarn from said yarn forming mechanism, said supply mechanism being provided with a capability of forming at least three nip points for stably controlling said bundle of fibers at a position facing said yarn forming mechanism at a time of commencing said yarn forming operation, said yarn forming mechanism being provided with a fluid nozzle for creating an eddy current fluid stream therein so that false twists are imparted to said core bundle fibers delivered from said supply mechanism at a position between said nip points and said fluid nozzle, and a suction means for controlling said outside fibers in united condition with said false twisted fiber bundle while said bundle of fibers is introducing into said fluid nozzle, said fluid nozzle provided with a fluid conduit for receiving compressed fluid thereinto;

• an improvement comprising, commencing a yarn forming operation in a condition wherein a distance between one of said nip points of said suppy mechanism and a most upstream position in said fluid nozzle where said compressed fluid is ejected thereinto is a predetermined length which is shorter than a normal distance for carrying out a normal yarn forming operation, carrying out an initial yarn forming operation for a short time in a condition of said shorter distance and, thereafter carrying out said yarn forming operation in a condition of gradually releasing said nip points from said nip point which is formed at the most downstream position to the nip point which is formed at a position adjacent to said nip point formed at the most upstream position so that said normal distance can be formed ultimately and further comprising, positioning said fluid nozzle at a position where said nozzle is in close proximity to said supply mechanism at the time when said nip points are formed and, then, displacing said fluid nozzle from said position to a downstream position where a normal yarn forming operation is carried out, while gradually releasing said nip points.

In an apparatus for manufacturing a fasciated yarn comprising a twistless core bundle of staple fibers and outside fibers wrapped around said core bundle fibers, provided with a mechanism for supplying a bundle of fibers and a mechanism for forming said yarn from said bundle of fibers supplied from said fiber supply mechanism, said supply mechanism being provided with a nip point where said bundle of fibers can be stably controlled when a normal yarn forming operation is carried out, means for taking up said yarn from said yarn forming mechanism, said yarn forming mechanism comprising a fluid nozzle for creating an eddy current fluid stream therein so that false twists are imparted to said core bundle fibers delivered from said supply mechanism at a position between said nip point and said fluid nozzle, and a suction means for controlling said outside fibers in united condition with said false twisted fiber bundle while said bundle of fibers is introducing into said fluid nozzle, said fluid nozzle being provided with a fluid conduit for receiving compressed fluid thereinto;

• an improvement comprising, means for holding said fluid nozzle in a condition wherein said means is capable of displacing said fluid nozzle towards said fiber bundle supply mechanism at the time when the initial yarn forming operation is carried out and means for stably positioning said fluid nozzle at a position where a normal yarn forming operation is carried out.

An improved apparatus for manufacturing a fasciated yarn comprising a twistless core bundle of staple fibers and outside fibers wrapped around said core bundle fibers, provided with a mechanism for supplying a bundle of fibers and a mechanism for forming said yarn from said bundle of fibers supplied from said fiber supply mechanism, said supply mechanism being provided with a nip point where said bundle of fibers can be stably controlled when a normal yarn forming operation is carried out, means for taking up said yarn from said yarn forming mechanism, said yarn forming mechanism comprising a fluid nozzle for creating an eddy current fluid stream therein so that false twists are imparted to said core bundle fibers delivered from said supply mechanism at a position between said nip point and said fluid nozzle, and a suction means for controlling said outside fibers in united condition with said false twisted fiber bundle while said bundle of fibers is introducing into said fluid nozzle, said fluid nozzle being provided with a fluid conduit for receiving compressed fluid thereinto;

• an improvement comprising said fiber bundle supply means comprising a first set of an upstream axle and a downstream axle and a second set of an upstream axle and a downstream axle, a pair of endless aprons mounted on corresponding sets of said axles in superimposed condition, said endless aprons being tightly contacted with each other at a facing position of said upstream axles so that said nip point is formed, means for selectively forming a fiber bundle controlling zone created by contacting said aprons with each other at a position between said nip point and a position facing said downstream axles and also selectively shortening a length of said fiber bundle controlling zone along a passage of said fiber bundle between said aprons from said nip point;
• and further comprising means for holding said fluid nozzle in a condition wherein said means is capable of displacing said fluid nozzle towards said fiber bundle supply mechanism at the time when the initial yarn forming operation is carried out and means for stably positioning said fluid nozzle at a position where a normal yarn forming operation is carried out.