Abstract: Fancy twists arranged and/or formed at random are provided on a yarn. The threads are delivered by a feed device at different feed speeds. The feed device has a first roller and a second roller, which rotate at different peripheral speeds. A yarn thread is arranged to be pressed optionally against one or the other roller by idler rollers. The idler rollers are directly actuated by a solenoid each. The solenoids are energized in push-pull mode by a random generator. The second roller forms part of a stepped roller assembly having rollers of different diameters, each of these rollers cooperating with a separate idler roller controlled by a solenoid.

Abstract: On a yarn, fancy twists arranged and formed at random shall be generated by a device added to the normal twisting device. To this end a fancy twist yarn thread is led through a pivotable fancy twist lever extending transversely to the moving direction of the basic yarn threads and is then led with the basic yarn threads to the cop of the twisting device. The fancy twist lever is deflectable by a fancy twist lever drive, such that the feed point of the fancy twist yarn thread moves along with the basic yarn threads. The fancy twist lever drive is controlled by an electronic control unit having a random generator.