For producing a yarn spun from a loose fibre array using a vortex flow an apparatus is used in which between a fibre supply duct and a yarn take-off tube a vortex chamber is provided. Due to such a constitution, in the component placement operation, it is possible to rationally set the accessible region without causing the interference of one mounting head with another mounting head thus shortening a placing tact time by excluding wasteful standby times of the mounting heads. The lift device includes a movable frame for raising and lowering the object. The first shaft section is configured to enable the second shaft section to releasably retract into or extend out of the first shaft section, and the second shaft section is configured to enable the third shaft section to releasably retract into or extend out of the second shaft section. The hollow countershaft has three fixed wheels which engage respective loose wheels, and the countershafts are rigidly coupled by a shifting element.