An air-jet type spinning device (4), comprising a body (8) at least partially hollow which defines a spinning chamber (12), a fibre feed device (16), facing said spinning chamber (12) so as to feed the fibres into the spinning chamber (12), a spinning spindle (20) at least partially inserted in the spinning chamber (12) and fitted with a spinning channel (24) for the suction of yarn obtained from said fibres, the spinning channel (24) defining a spinning direction (X-X), at least one channel (28) for sending a jet of compressed air inside the spinning chamber (12). Advantageously, the spinning chamber (12) is delimited at least partially by an outer side wall (32), opposite the spinning spindle (20), wherein at least one thread (36) is made on said outer side wall (32), wherein said at least one channel (28) is oriented so as to direct the jet of compressed air towards the at least one thread (36) in order to be guided and oriented by the latter.

An air-jet type spinning device (4), comprising a body (8) at least partially hollow which defines a spinning chamber (12), a fibre feed device (16), facing said spinning chamber (12) so as to feed the fibres into the spinning chamber (12), a spinning spindle (20) at least partially inserted in the spinning chamber (12) and fitted with a spinning channel (24) for the suction of yarn obtained from said fibres, the spinning channel (24) defining a spinning direction (X-X), at least one channel (28) for sending a jet of compressed air inside the spinning chamber (12). Advantageously, the spinning chamber (12) is delimited at least partially by an outer side wall (32), opposite the spinning spindle (20), wherein at least one thread (36) is made on said outer side wall (32), wherein said at least one channel (28) is oriented so as to direct the jet of compressed air towards the at least one thread (36) in order to be guided and oriented by the latter.

An air-jet type spinning device (4), comprising a body (8) at least partially hollow which defines a spinning chamber (12), a fibre feed device (16), facing said spinning chamber (12) so as to feed the fibres into the spinning chamber (12), a spinning spindle (20) at least partially inserted in the spinning chamber (12) and fitted with a spinning channel (24) for the suction of yarn obtained from said fibres, the spinning channel (24) defining a spinning direction (X-X), at least one channel (28) for sending a jet of compressed air inside the spinning chamber (12). Advantageously, the spinning chamber (12) is delimited at least partially by an outer side wall (32), opposite the spinning spindle (20), wherein at least one thread (36) is made on said outer side wall (32), wherein said at least one channel (28) is oriented so as to direct the jet of compressed air towards the at least one thread (36) in order to be guided and oriented by the latter.

A yarn ring spinning and/or twisting machine with multiple balls, comprising means to move the relative position of the yarn guide (8) with respect to the yarn exit point (Y1) from the yarn feed means (1) with a trajectory (T) not aligned with the axis of rotation (V) during a spinning cycle, such that the trajectory of the yarn along a lower area (LB) between the yarn guide (8) and the cursor-ring assembly (5), where at least 2 balls are formed, does not foul the yarn collection means (4) in order for the spinning process to be stable. Preferably, the trajectory (T) of the yarn guide (8) has a first section which moves the yarn guide (8) on the axis of rotation (V) of the yarn collection means (4), and a second section which moves the yarn guide (8) away from the axis of rotation (V) of the yarn collection means (4).

A yarn ring spinning and/or twisting machine with multiple balls, comprising means to move the relative position of the yarn guide (8) with respect to the yarn exit point (Y1) from the yarn feed means (1) with a trajectory (T) not aligned with the axis of rotation (V) during a spinning cycle, such that the trajectory of the yarn along a lower area (LB) between the yarn guide (8) and the cursor-ring assembly (5), where at least 2 balls are formed, does not foul the yarn collection means (4) in order for the spinning process to be stable. Preferably, the trajectory (T) of the yarn guide (8) has a first section which moves the yarn guide (8) on the axis of rotation (V) of the yarn collection means (4), and a second section which moves the yarn guide (8) away from the axis of rotation (V) of the yarn collection means (4).

A driven ring assembly for a ring-spinning or ring-twisting machine includes a ring and an electric drive having a stator and a rotor with a magnet. A ring crown is on the ring and a ring traveler is on the ring crown. A connecting portion is between the ring and the rotor. The electric drive includes coil winding strands in the stator that generate a torque and radial forces. An axial degree of freedom and tilting degrees of freedom of the rotor are passively stabilized by reluctance forces and radial degrees of freedom of the rotor are actively stabilized by a control loop controlling current through the coil winding strands.

A driven ring assembly for a ring-spinning or ring-twisting machine includes a ring and an electric drive having a stator and a rotor with a magnet. A ring crown is on the ring and a ring traveler is on the ring crown. A connecting portion is between the ring and the rotor. The electric drive includes coil winding strands in the stator that generate a torque and radial forces. An axial degree of freedom and tilting degrees of freedom of the rotor are passively stabilized by reluctance forces and radial degrees of freedom of the rotor are actively stabilized by a control loop controlling current through the coil winding strands.

The invention relates to a rotor spinning machine and to a method for operating a rotor spinning machine with a control device, an open-end rotor spinning device and a supply unit feeding at least two fiber slivers into the open-end rotor spinning device, which supply unit has an opening roller for opening fiber slivers and a feed apparatus with a first and a second feed roller, which can be operated independently of one another by means of the control device, for a first fiber sliver and a second fiber sliver. In order to provide a rotor spinning machine as well as a method for operating a rotor spinning machine, which enables easy setting of the drafting speeds of the supply unit having at least two feed rollers, it is provided that the control device determines an individual drafting speed of one feed roller for producing a yarn with predetermined yarn properties from a single fiber sliver fed by means of the first feed roller, and coordinates a first drafting speed of the first feed roller and a second drafting speed of the second feed roller with one another in such a way that the sum of the first and second drafting speeds corresponds to the individual drafting speed.

The invention relates to a rotor spinning machine and to a method for operating a rotor spinning machine with a control device, an open-end rotor spinning device and a supply unit feeding at least two fiber slivers into the open-end rotor spinning device, which supply unit has an opening roller for opening fiber slivers and a feed apparatus with a first and a second feed roller, which can be operated independently of one another by means of the control device, for a first fiber sliver and a second fiber sliver. In order to provide a rotor spinning machine as well as a method for operating a rotor spinning machine, which enables easy setting of the drafting speeds of the supply unit having at least two feed rollers, it is provided that the control device determines an individual drafting speed of one feed roller for producing a yarn with predetermined yarn properties from a single fiber sliver fed by means of the first feed roller, and coordinates a first drafting speed of the first feed roller and a second drafting speed of the second feed roller with one another in such a way that the sum of the first and second drafting speeds corresponds to the individual drafting speed.

A motor includes a stationary portion that includes a shaft extending vertically along a central axis, a rotating portion that rotates around the central axis as a center, and a bearing that rotatably supports the rotating portion with respect to the shaft. The rotating portion includes on an outer side of the stationary portion in a radial direction a cylindrical motor casing that extends in an axial direction around the shaft as a center and a magnet that is disposed on an inner peripheral surface of the motor casing. The stationary portion includes a circuit board that is perpendicularly disposed with respect to the shaft, and a stator that is positioned below the circuit board in the axial direction and above the bearing in the axial direction. The stator includes a stator core that includes a ring-shaped core back having the central axis as the center and a plurality of teeth extending outward from the core back in the radial direction, and a coil that includes a conductor wire wound around the teeth. A first conductor wire that is led out from the coil is connected to the circuit board. A second conductor wire is connected to an upper surface of the circuit board in the axial direction.