Abstract: A handheld yarn measuring device (1) for monitoring yarn in yarn processing machines. The yarn measuring device includes a catcher (8), which when a trip lever (6) is actuated, places the yarn over a yarn applicator element (27) of a force sensor (29). The yarn tension and speed is detectable and delivered to a processing device for display and further processing. The device, which may be operated by one hand, has a boomerang-shaped housing (2) one end of which supports the trip lever (6), a control knob (10) and a display (5). The control knob (10) can be twisted and depressed by the user's thumb so that the selection of all the measurement and operating modes can be done with only the thumb. The measurement is performed by means of the trip lever (6), which actuates both the yarn catcher (8) and a measurement activation switch (49).

Abstract: A yarn blow-in valve is constructed of a base body and a connecting piece. This permits locating a compressed air line behind a cover wall, assembling the yarn blow-in valve, and then coupling it to the air line in a readily performed manner. In order to facilitate the assembly, a coupling device is provided to connect the base body with the connecting piece.