In a drafting system (1) for a textile machine, in particular an air-spinning machine, for drafting a strand-shaped fibre band fed to the drafting system, having a plurality of roller pairs arranged in succession in a running direction (A) of the fibre band and each having a top roller (3) and a bottom roller (4), and a weighting device for applying a load to the top roller (3) of the plurality of roller pairs; wherein the respective bottom roller (4) is mounted and held in a housing (2) of the drafting system (1), wherein the respective top roller (3) is mounted and held in the housing (2) of the drafting system (1) by means of a top roller carrier (30) which can be pivoted about a rotary axis.

In a drafting system (1) for a textile machine, in particular an air-spinning machine, for drafting a strand-shaped fibre band fed to the drafting system, having a plurality of roller pairs arranged in succession in a running direction (A) of the fibre band and each having a top roller (3) and a bottom roller (4), and a weighting device for applying a load to the top roller (3) of the plurality of roller pairs; wherein the respective bottom roller (4) is mounted and held in a housing (2) of the drafting system (1), wherein the respective top roller (3) is mounted and held in the housing (2) of the drafting system (1) by means of a top roller carrier (30) which can be pivoted about a rotary axis.

The invention discloses a method of dynamically configuring linear density and blending ratio of yarn by three-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 three 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 linear density change, but also accurately control a color change of the yarn. Further, the rotation rate of the middle roller is constant, ensuring a reproducibility of the patterns and colors of the yarn with a changing linear density.

The invention discloses a method of dynamically configuring linear density and blending ratio of yarn by three-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 three 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 linear density change, but also accurately control a color change of the yarn. Further, the rotation rate of the middle roller is constant, ensuring a reproducibility of the patterns and colors of the yarn with a changing linear density.

A method and a device includes a drafting and twisting system. The drafting and twisting system include 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. The blending proportion and linear densities of the five ingredients are dynamically adjusted by the first stage asynchronous drafting mechanism, and the reference linear density is adjusted by the second stage synchronous drafting mechanism. The invention can not only accurately control a linear density, but also accurately control a color change of the yarn.

The invention relates to a spinning station of an air-jet spinning machine for producing a thread from a sliver, and to a method for carrying out a piecing process at such a spinning station, wherein a thread end that has run onto a take-up bobbin is taken up by means of a thread take-up device and transferred to a thread-end preparation device arranged downstream from a vortex chamber of the air-jet spinning device in the thread running direction, the thread end is subsequently treated in the thread-end preparation device and then transferred to the vortex chamber of the air-jet spinning device and positioned there, a drafting system for drafting and supplying a sliver to the vortex chamber is powered up, wherein an exit roller pair of the drafting system is accelerated to a predetermined draw-off speed, and wherein the sliver is spun onto the prepared thread end in the vortex chamber and a motor-driven draw-off device for drawing off the thread spun in the vortex chamber is powered up and thereby accelerated up to the draw-off speed. In order to provide a method for carrying out a piecing process and an air-jet spinning machine which allow a reliable piecing process, it is provided that the drafting system and/or the draw-off device are powered up in such a way that the speed of the exit roller pair and/or of the draw-off device increases non-linearly at the beginning of powering up and/or approaches the predetermined draw-off speed non-linearly around the end of powering up.

The invention relates to a spinning station of an air-jet spinning machine for producing a thread from a sliver, and to a method for carrying out a piecing process at such a spinning station, wherein a thread end that has run onto a take-up bobbin is taken up by means of a thread take-up device and transferred to a thread-end preparation device arranged downstream from a vortex chamber of the air-jet spinning device in the thread running direction, the thread end is subsequently treated in the thread-end preparation device and then transferred to the vortex chamber of the air-jet spinning device and positioned there, a drafting system for drafting and supplying a sliver to the vortex chamber is powered up, wherein an exit roller pair of the drafting system is accelerated to a predetermined draw-off speed, and wherein the sliver is spun onto the prepared thread end in the vortex chamber and a motor-driven draw-off device for drawing off the thread spun in the vortex chamber is powered up and thereby accelerated up to the draw-off speed. In order to provide a method for carrying out a piecing process and an air-jet spinning machine which allow a reliable piecing process, it is provided that the drafting system and/or the draw-off device are powered up in such a way that the speed of the exit roller pair and/or of the draw-off device increases non-linearly at the beginning of powering up and/or approaches the predetermined draw-off speed non-linearly around the end of powering up.

A tensioning device for a spinning unit and/or stretching device. The tensioning device includes at least one roller, at least one belt, and at least one tension rod. The tensioning device can be transferred from a functional state into a non-functional state. The functional state is designed for positioning position the at least one roller in that the belt is designed and arranged for exerting a tension on the roller, in that the belt is further designed and arranged for running around a section of the roller and a section of the tension rod such that a tension is transferred from the tension rod onto the roller via the belt. In the non-functional state, the tensioning device is designed and configured such as to move the tension rod via tension on the belt, for removing the belt from the tension rod.

A tensioning device for a spinning unit and/or stretching device. The tensioning device includes at least one roller, at least one belt, and at least one tension rod. The tensioning device can be transferred from a functional state into a non-functional state. The functional state is designed for positioning position the at least one roller in that the belt is designed and arranged for exerting a tension on the roller, in that the belt is further designed and arranged for running around a section of the roller and a section of the tension rod such that a tension is transferred from the tension rod onto the roller via the belt. In the non-functional state, the tensioning device is designed and configured such as to move the tension rod via tension on the belt, for removing the belt from the tension rod.

A support element for a compacting device for two drawing system units of a spinning machine disposed next to each other, includes a suction channel that extends inside the support element and is connected to a suction zone of suction drums via openings of suction inserts. The end faces of the suction drums are open at one end and are disposed coaxially opposite each other at a distance. The suction drums are rotatably mounted on a shaft that is attached to the support element. The support element is formed from two half shells that form the suction channel and are connected to each other by way of attachment means, wherein each of the half shells has an outwardly projecting tubular suction insert. The suction inserts are disposed coaxially opposite each other, and each suction insert has at least one bearing element that is provided with a passage and has at least one brace, by way of which the shaft is held in the radial direction.