Drawing unit for a fine-spinning machine, in particular a jet-spinning machine
AssigneeMaschinenfabrik Rieter AG
InventorsMartin Tobler, Reto Debrunner, Martin Witschi
Life of this patent
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Abstract
An apparatus and method for guiding a broken thread end in a yarn spinning machine into a position in readiness for piecing wherein the broken thread end is retrieved from a bobbin, routed through a yarn spinning mechanism, guided into the nip of a pair of rollers of an operating drafting apparatus without abrasion of or interference with the yarn end during the guiding of the yarn end and wherein the yarn end is deposited in a position in the drafting apparatus such that the yarn end is controllably withdrawn from the drafting apparatus through the spinning mechanism and pieced or joined with a new sliver as the yarn end is withdrawn.
Claims20
A drafting arrangement for a fine spinning frame the drafting arrangement having at least one pair of input rollers, an apron drafting zone and a pair of output rollers having a nip line, characterized in that a pressure roller of the pair of output rollers is provided with a cap which is non-rotationally arranged in the drafting arrangement and which is provided with a yarn guiding surface which is suitable for guiding a yarn to the nip line of the pair of output rollers.
A roller for a drafting arrangement of a fine spinning frame with an axle and a roller body rotatably carried on said axle, characterized in that a cap is rigidly attached to the axle and comprises a yarn guiding surface which is suitable for guiding a yarn to a nip line formed by the roller.
A yarn spinning machine comprising a spinning mechanism and a drafting apparatus for continuously delivering a sliver to an inlet of the spinning mechanism wherein the sliver is spun into a yarn and the yarn is continuously withdrawn from the spinning mechanism and wound up;
- the drafting apparatus comprising a pair of rotatably mounted rollers for delivering the sliver along a selected path to the inlet of the spinning mechanism;
- the delivery rollers having a nip line extending from a position in the selected path to the inlet laterally to an end of the rollers laterally displaced from the inlet of the spinning mechanism;
- the end of one of the rollers having a cap mechanism mounted on the end of the one roller such that the cap does not rotate together with the one roller;
- the cap having an outer surface for guiding a yarn end which is reversely routed through the spinning mechanism and laterally guided around the cap on the end of the one roller into the nip of the rollers upon further guiding of the reversely routed yarn end to a position upstream of the nip line position in the path to the inlet of the spinning mechanism.
Dependencies are inferred from the claim text.