Abstract: The present invention provides a method for selecting components of a rotor spinning device of a textile machine such that the operational characteristics of the components are optimally suited for the spinning of a yarn to be used in a predetermined fabric application. The method includes several prompting steps during which a user is prompted for information regarding the predetermined fabric application. In response to the information inputted by the user concerning the predetermined fabric application, the user is interrogated concerning the preferred characteristics of the predetermined fabric application. The method additionally includes prompting the user to provide information relating to the raw material of the yarn to be used in the predetermined fabric application and the yarn count of the yarn.

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.