Vorrichtung zum Fadenansetzen in einer Offen-End-Spinnvorrichtung

A momentary contact switch connected in parallel with a yarn tension monitoring switch is actuated by swinging of the bobbin holder beyond a normal servicing position immediately prior to swinging such holder into working position. Such switch overrides the yarn-monitoring switch to effect fiber feed to the yarn formation zone earlier than such feed would normally be effected by the yarn-monitoring switch since the latter switch is not actuated until the yarn tension is increased to normal spinning tension. A holding switch is actuated by the momentary contact switch to maintain the overriding function between the time the momentary contact switch is released by the bobbin holder being swung out of contact and the time the yarn-monitoring switch is reversed. Alternatively, a Bowden wire connecting the bobbin holder and the yarn-monitoring switch reverses such switch to begin fiber feed. Other overriding switch constructions include a button on the bobbin holder manually operable to release the bobbin holder from a latched servicing position and simultaneously to actuate the overriding switch, a swingable switch lever moved into and out of switch-actuating contact with a leaf spring contact as a cam slides past it on opposite passes of the swinging bobbin holder, or a ratchet-and-pawl latch for the bobbin holder in which the pawl constitutes a switch-actuating cam.