Yarn brake assembly having a guide element for bypassing a yarn brake during threading

A device for guiding and braking a yarn running in an approximately linear direction along a yarn running path, comprising a yarn feeder which keeps said yarn ready for delivery, and a yarn receiver disposed in said yarn running path downstream of said yarn feeder for drawing off said yarn from said yarn feeder under the action of a drawing force, said device including a yarn brake which is arranged in said yarn running path between said yarn feeder and said yarn receiver, said yarn brake comprising two braking elements having means for being flexibly pressed together such that said brake elements are pressed in a direction transverse to the yarn running direction flexibly against each other and define a pinch zone which brakingly acts on said yarn when said yarn runs along said yarn path in between said braking elements, said device further including a pneumatic threader for producing at least one airflow approximately in the yarn running direction which conveys said yarn forwardly toward said yarn brake, comprising the improvement wherein said yarn brake comprises at least one guide element for guiding said air flow and said yarn, said guide element surrounding said pinch zone of said braking elements without contact, said guide element comprising a receiving end located in said yarn running direction upstream of said pinch zone and laterally adjacent to said yarn running path, a delivery end located downstream of said pinch zone and oriented towards said yarn running path, and a guide channel which connects said receiving end and said delivery end, said guide channel having an open side which is open towards said braking elements such that said yarn is conveyed for threading purposes by means of said air flow through said guide channel and past said pinch zone to said yarn receiver, and is introduced into said pinch zone between said two braking elements under the action of said drawing force produced in said yarn.