A process of automatic yarn spinning machine in the spinning unit of an open end rotor spinning machine of an automatic service device provided with a control unit having a programmable microprocessors control system for controlling the spinning in cycle and the automatic adjustment of spinning in parameters modified according to successive verifying tests which are performed by the automatic service device which is either arranged in the individual spinning units, or as a unit traveling along the machine. By successive tests, spinning in parameters are adjusted for an interval for yarn return to the spinning rotor as well as for determining the start of fiber feeding. The spinning in parameters can be corrected by further verifying tests in spinning units with various dynamic characteristics.
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