Abstract: Thread brake including a rotatably driven lower and upper dish, a device for applying a load with adjustable pressure to the upper dish, the device including a chamber, an elastic container of variable volume received in the chamber, and a central compressed-gas supply connected to the elastic container, the elastic container being of such size in non-pressurized condition thereof that, upon being pressurized, the elastic wall thereof is not stretched, and plunger means for transmitting the pressure from the elastic container to the upper dish, the plunger means extending through an opening formed in a wall of the chamber and having a contact surface of predetermined size directed against the elastic container.

Abstract: Method of controlling thread joining in a rotor-spinning machine, which includes applying a pulse proportional to the rotary speed of the spinning machine rotor to control a measure of the material being processed in the spinning operation, and device for performing the foregoing method.

Abstract: Assembly includes a closed pneumatic device for applying a load to a thread brake for braking a thread traveling therethrough, the load-applying device including means for storing pressure at a variable volume, and means operatively connected to the closed pneumatic load-applying device for determining and signaling a detrimental pneumatic leakage loss in the load-applying device.

Abstract: Method of controlling a thread-joining operation in a rotor-spinning machine having a rotor formed with a fiber-collecting channel, wherein a pulse proportional to the rotary speed of the rotor is applied to control a measure of the material being processed in the spinning operation which includes automatically controlling advance feeding into the rotor of a quantity of fiber required for thread-joining and feeding the fiber beginning with withdrawal of a thread formed for the fiber as well as returning into the rotor the thread end to be joined and withdrawing the joined thread from the rotor during start-up of the rotor, the automatic control being in accordance with a quantity proportional to the peripheral velocity of the fiber-collecting channel of the rotor serving as control input variable for at least one of the fiber feed, the thread withdrawal, the beginning of the advance feeding and the beginning of the returning of the thread end, and device for carrying out the method.