A drafting system for conveying a sliver to an inlet opening of a vortex chamber of an air-jet spinning device, for a drafting system having an exit roller pair and at least one additional drafting system roller pair and/or apron roller pair. A sliver is supplied at a spinning station of an air-jet spinning machine for the production of a thread to the vortex chamber. The exit roller pair can be driven decoupled from the at least one additional pair of drafting system rollers and/or apron rollers. In the method, the roller pair is driven for combing the sliver end after a spinning interruption at a predetermined combing speed and the at least one stretching mill roller and/or belt roller pair upstream of the starting roller pair is stopped or operated at a holding speed associated with the combing speed, which is at most 10% of the combing speed.

A drafting system for conveying a sliver to an inlet opening of a vortex chamber of an air-jet spinning device, for a drafting system having an exit roller pair and at least one additional drafting system roller pair and/or apron roller pair. A sliver is supplied at a spinning station of an air-jet spinning machine for the production of a thread to the vortex chamber. The exit roller pair can be driven decoupled from the at least one additional pair of drafting system rollers and/or apron rollers. In the method, the roller pair is driven for combing the sliver end after a spinning interruption at a predetermined combing speed and the at least one stretching mill roller and/or belt roller pair upstream of the starting roller pair is stopped or operated at a holding speed associated with the combing speed, which is at most 10% of the combing speed.

The invention discloses a method and device of dynamically configuring linear density and blending ratio of yarn by four-ingredient asynchronous/synchronous drafted, comprising: a drafting and twisting system, which includes a first stage drafting unit, a successive second stage drafting unit and an integrating and twisting unit. The first stage drafting unit includes a combination of back rollers and a middle roller. The second stage drafting unit includes a front roller and the middle roller. Blending proportion and linear densities of the four ingredients are dynamically adjusted by the first stage asynchronous drafting mechanism, and reference linear density is adjusted by the second stage synchronous drafting mechanism. The invention can not only accurately control a linear density change, but also accurately control color change of the yarn. Further, rotation rate of the middle roller is constant, ensuring a reproducibility of patterns and colors of the yarn with changing linear density.

An air jet spinning machine and a drafting system unit for a spinning unit produce a thread or roving from a supplied fiber strip, with a front roller pair including a front top roller on a load carrier and a driven front bottom roller on a bottom roller carrier, and a bearing element arranged on the bottom roller carrier for movably bearing an air jet spinning nozzle. A reliable pivotable air jet spinning nozzle which can be released from the bottom roller carrier is implemented by the bottom roller carrier including a bearing element having a free end, for receiving the air jet spinning nozzle, wherein the bearing element forms a pivot axis for pivoting the air jet spinning nozzle between an operating position and a second position, wherein the bearing element is connected to a portion spaced apart from the free end on the bottom roller carrier.

An air jet spinning machine and a drafting system unit for a spinning unit produce a thread or roving from a supplied fiber strip, with a front roller pair including a front top roller on a load carrier and a driven front bottom roller on a bottom roller carrier, and a bearing element arranged on the bottom roller carrier for movably bearing an air jet spinning nozzle. A reliable pivotable air jet spinning nozzle which can be released from the bottom roller carrier is implemented by the bottom roller carrier including a bearing element having a free end, for receiving the air jet spinning nozzle, wherein the bearing element forms a pivot axis for pivoting the air jet spinning nozzle between an operating position and a second position, wherein the bearing element is connected to a portion spaced apart from the free end on the bottom roller carrier.