Method for piecing fasciated yarn
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsAkira Tanaka, Kazuo Seiki, Haruyoshi Nakamura
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Abstract
A method for yarn piecing in a fasciated yarn spinning unit, in which a yarn portion to be pieced is always nipped by a piecing roller means during the piecing operation, whereby feeding length and speed of the yarn in the piecing operation can be accurately controlled by the piecing roller means. Thus, a complicated restarting operation can be carried out in accordance with a predetermined time schedule.
Claims6
A method for piecing a broken end of a yarn with a fiber bundle in a fasciated yarn spinning unit, said unit comprising a drafting means including a back roller pair and a front roller pair for attenuating the fiber bundle and an air nozzle for twisting the fiber bundle by a vortex to form a fasciated yarn, comprising steps of:
- a. guiding a yarn to be pieced to an outlet of said air nozzle while nipping it by a displaceable piecing roller means;
- b. reversely introducing the yarn into said drafting means through said air nozzle and the front roller pair while controlling the introduced yarn length by reverse directional rotation of said piecing roller means;
- c. withdrawing the yarn from the outlet of said air nozzle by normal directional rotation of said piecing roller means while overlapping the fiber bundle on the yarn at the nip point of the front roller pair, the withdrawing speed being controlled to synchronize with the delivery speed of said front roller pair;
- and
- d. generating the vortex in said air nozzle to twist the overlapped portion.
Dependencies are inferred from the claim text.