Yarn tension transducer

A yarn tension transducer comprising a movable yarn guide against which a running yarn touches and which is under a biasing force towards the yarn, movement of the guide in either of two opposite directions in response to yarn tension fluctuations being converted electrically into an indication of yarn tension values, the yarn guide being mounted on a springy thin plate which is of ferromagnetic material and generally of W shape with a central portion between two outer arms, the plate being clamped by the respective ends of the two outer arms, and the yarn guide being carried at a forward end of the central portion with the latter lying between two similar electrical induction coils located opposite one another, whereby the central portion of the plate operates as a spring-loaded armature.