Abstract: The invention relates to an air jet spinning machine and a drafting system unit for a spinning unit of an air jet spinning machine for producing a thread or roving from a supplied fiber strip, with at least one front roller pair consisting of a front top roller on a load carrier and a driven front bottom roller on a bottom roller carrier and forming a clamping line, and a bearing element arranged on the bottom roller carrier for movably bearing an air jet spinning nozzle.

Abstract: A textile machine producing cross-wound packages with a plurality of identical workstations which are arranged in the area of the longitudinal sides of the textile machine and each of which has a winding device, and equipped with a tube supply device which includes a central tube magazine and at least one tube conveyor belt installed in the area of the longitudinal sides of the machine, in which case a cross-wound package can be removed, if necessary, from the winding device of the relevant workstation on the textile machine producing cross-wound packages and can be transferred to a cross-wound package transport device running the length of the machine, and an empty tube provided on the tube conveyor belt of the tube supply device can be inserted by means of a tube gripper into the winding device of the relevant workstation.

Abstract: A textile machine for producing cross-wound packages, the machine being equipped with a plurality of workstations arranged next to one another on both longitudinal sides of the machine and having a cross-wound package transport apparatus. The cross-wound package transport apparatus has a first transport device, arranged between the two rows of workstations for conveying cross-wound packages, and a handling apparatus for moving cross-wound packages from the first transport device to the second transport device. The handling apparatus is arranged between the end regions of the first transport device.

Abstract: A method for optimizing the operation of a spinning machine with regard to quality and productivity is provided. An apparatus, comprising a control device and the spinning machine is provided. A yarn having specified yarn properties is produced, a quality parameter of the yarn is sensed during the spinning operation, a parameter for setting the production speed is specified, the quality parameter and the parameter for setting the production speed are evaluated, and the production speed is set in dependence on a target variable, the target variable comprising the quality parameter.

Abstract: A yarn deflection unit for a textile machine, having a housing comprising a curved wall section for forming a radially outer wall section of a curved yarn deflection channel. The solution proposed by the invention is distinguished in that the curved wall section has a yarn guiding groove extending along the curvature for receiving and guiding a yarn.

Abstract: A drafting system unit for a drafting system of a spinning machine having a first top roller and a second top roller spaced apart therefrom, characterized in that an apron cage to which negative pressure can be applied is arranged between the first top roller and the second top roller for guiding an air-permeable apron in circulation jointly around the apron cage and an apron top roller, the apron top roller being formed by the first top roller or by a third top roller that is assigned to the apron cage and arranged on the same side as the first and second top roller in relation to the fiber band being transported. The apron cage has at least one through-opening, to which negative pressure can be applied, for applying suction air to the fiber band running between the first and second top roller, through the air-permeable apron.

Abstract: A textile machine for producing cross-wound packages, comprising a plurality of workstations, each of which has at least one pneumatic consumer, and comprising a suction system which has at least one vacuum source to which the pneumatic consumers of the workstations are connected via a machine-length vacuum duct arranged in the region of the central axis between two rows of workstations. In order to modify such a textile machine producing cross-wound packages in such a way that it is ensured that the required minimum spinning vacuum is always available at all workstations of the textile machine during spinning operation, according to the invention the textile machine producing cross-wound packages has, in addition to the vacuum duct, a machine-length bypass duct which is also installed in the region of the central axis and is arranged above chain ducts for service units.

Abstract: A tube storage and transport device for a textile machine producing cross-wound packages, which has a plurality of similar workstations arranged side-by-side on both longitudinal machine sides, having a central tube magazine and two empty-tube conveyor belts arranged in the region of the longitudinal machine sides is provided. To improve the known tube storage and transport devices, and in particular to optimize the clock times that can be achieved during the empty-tube delivery, the tube magazine has at least two elevator units, that the elevator units have stacked and vertically displaceable holders for empty tubes, that the holders are designed for the empty tubes to be set down in a manner oriented the longitudinal direction of the machine, and that each of the elevator units is connected to one of the empty-tube conveyor belts and is designed in such a way that empty tubes are removed from the elevator units from the longitudinal machine side and transferred onto the empty-tube conveyor belts.

Abstract: A textile machine producing cross-wound packages with a plurality of identical workstations which are arranged in the area of the longitudinal sides of the textile machine and each of which has a winding device, and equipped with a tube supply device which includes a central tube magazine and at least one tube conveyor belt installed in the area of the longitudinal sides of the machine, in which case a cross-wound package can be removed, if necessary, from the winding device of the relevant workstation on the textile machine producing cross-wound packages and can be transferred to a cross-wound package transport device running the length of the machine, and an empty tube provided on the tube conveyor belt of the tube supply device can be inserted by means of a tube gripper into the winding device of the relevant workstation.

Abstract: Method for operating a service unit for processing work orders regarding a cross-wound package/empty tube doffing process employed at spinning machines producing take-up packages that process at least two different lots, whereby the service unit is fed an empty tube via the spinning machine's tube feed track, and the fed empty tube is taken up by the service unit. If the current work order for the cross-wound package/empty tube doffing of the workstations expires before it is processed and the empty tube is exchanged and another work order has come in which is for a workstation requiring a cross-wound package/empty tube doffing for another lot, the already taken up empty tube is released by the service unit, and the service unit takes up an empty tube of another lot in order to be able to carry out a cross-wound package/empty tube doffing process at the other workstation.

Abstract: A method for optimizing the operation of a spinning machine with regard to quality and productivity is provided. An apparatus, comprising a control device and the spinning machine is provided. According to the invention, a yarn having specified yarn properties is produced, a quality parameter of the yarn is sensed during the spinning operation, a parameter for setting the production speed is specified, the quality parameter and the parameter for setting the production speed are evaluated, and the production speed is set in dependence on a target variable, the target variable comprising the quality parameter.

Abstract: Drafting system unit having a weighting arm and to a weighting arm for a drafting system unit for drafting a fiber band at a workstation of a textile machine, said weighting arm having a support arm and a top roller body, which is detachably mounted on a retaining device connected to the support arm. In order to provide a drafting system having a weighting arm and to provide a weighting arm for a drafting system unit for drafting a fiber band at a workstation of a textile machine, which drafting system and weighting arm can, in a user-friendly manner, be inspected, repaired and/or adapted to the fiber band material to be drafted and allow the top roller bodies to be easily replaced, there is provision for the top roller body to have an actuation section, which protrudes beyond the support arm in longitudinal axis direction of the top roller body.

Abstract: A spinning machine having several spinning positions, the spinning machine having an air flow supply unit for providing compressed air and/or suction air at the spinning positions and a drafting system support extending along the spinning positions, for detachably arranging drafting systems at the spinning positions. In order to provide a spinning machine that allows compressed air and/or suction air to be supplied to the spinning positions in an energy-efficient manner, it is provided that the drafting system support is designed as a longitudinally channeled tube body having a flow connection to the air flow supply unit and having connection openings assigned to the individual spinning positions.

Abstract: An apron drafting system for a spinning machine, in particular an air spinning machine, with a bottom apron guided over a drivable bottom roller, the bottom apron being supported in the area of a drawing zone, in particular a main drawing zone, by a sliding section of an apron bridge. In order to provide an apron drafting system in which reliable guidance of the bottom apron is ensured while maintaining a high drive power, there is provision for the apron bridge for guiding the bottom apron to have a line section with guiding means for lateral guidance of the bottom apron circulating around the apron bridge.

Abstract: A textile machine for producing cross-wound packages, which has a plurality of workstations on the two longitudinal sides of the machine and is equipped with a tube magazine arranged at an end of the machine, the tube magazine having a plurality of empty-tube transport rows, driven by electric motor and loaded with empty tubes of different yarn lots. In order to avoid the fixed division of the empty-tube transport rows that hitherto was defined by the construction of the tube magazine and thus to avoid limited variations in the yarn lot management, the invention provides for the empty-tube transport rows to be equipped with electric drives, which are connected to a control unit of the textile machine, the machine control system being designed in such a way that different lot management programs are set by software.

Abstract: A tube storage and transport device for a textile machine producing cross-wound packages, which has a plurality of similar workstations arranged side-by-side on both longitudinal machine sides, having a central tube magazine and two empty-tube conveyor belts arranged in the region of the longitudinal machine sides is provided. To improve the known tube storage and transport devices, and in particular to optimize the clock times that can be achieved during the empty-tube delivery, the tube magazine has at least two elevator units, that the elevator units have stacked and vertically displaceable holders for empty tubes, that the holders are designed for the empty tubes to be set down in a manner oriented the longitudinal direction of the machine, and that each of the elevator units is connected to one of the empty-tube conveyor belts and is designed in such a way that empty tubes are removed from the elevator units from the longitudinal machine side and transferred onto the empty-tube conveyor belts.

Abstract: A textile machine for producing cross-wound packages, the machine being equipped with a plurality of workstations arranged next to one another on both longitudinal sides of the machine and having a cross-wound package transport apparatus. The cross-wound package transport apparatus has a first transport device, arranged between the two rows of workstations for conveying cross-wound packages, and a handling apparatus for moving cross-wound packages from the first transport device to the second transport device. The handling apparatus is arranged between the end regions of the first transport device.

Abstract: A textile machine for producing cross-wound packages, comprising a plurality of workstations, each of which has at least one pneumatic consumer, and comprising a suction system which has at least one vacuum source to which the pneumatic consumers of the workstations are connected via a machine-length vacuum duct arranged in the region of the central axis between two rows of workstations. In order to modify such a textile machine producing cross-wound packages in such a way that it is ensured that the required minimum spinning vacuum is always available at all workstations of the textile machine during spinning operation, according to the invention the textile machine producing cross-wound packages has, in addition to the vacuum duct, a machine-length bypass duct which is also installed in the region of the central axis and is arranged above chain ducts for service units.

Abstract: A supporting frame for a drafting system unit for drafting a fiber band at a workstation of a textile machine as well as a drafting system comprising such a drafting system unit. In order to make a drafting system and a drafting system unit available, the supporting frame has a coupling section and a locking unit for detachably connecting the supporting frame to an assigned workstation.

Abstract: A drafting system unit for a drafting system of a spinning machine. In a fiber band transport direction (R), the drafting system unit has a first top roller and a second top roller spaced apart therefrom, which are provided for drafting a fiber band, transported from the first to the second top roller, in cooperation with accordingly assigned bottom rollers, the respective axes of rotation of the first and second top roller extending transversely to the fiber band transport direction. The drafting system unit is characterized in that an apron cage to which negative pressure can be applied is arranged between the first top roller and the second top roller for guiding an air-permeable apron in circulation jointly around the apron cage and an apron top roller, the apron top roller being formed by the first top roller or by a third top roller that is assigned to the apron cage and arranged on the same side as the first and second top roller in relation to the fiber band being transported.