spring 11 so as to brake the combing roller the numeral 15 denotes a grip lever secured to the braking lever 8 and provided with a yarn grip piece 16 which is located at the exit of the spinning tube 5 as the braking lever 8 is pivoted about pivot pin 9 for braking the combing roller said grip lever 15 is also pivoted concurrently with the braking lever 8 so that the spun yarn 18 is gripped between the yarn grip piece 16 and a fixed stopper 17 the grip lever 15 is preferably a leaf spring in order to resiliently grip the yarn 18 by the yarn piece 16 and the fixed stopper 17 although a single spinning unit is shown in fig3 usually a large number of the spinning units as shown in fig3 are arranged in parallel in a single spinning system in a modified embodiment shown in fig4 and 5 the solenoids 12 of the spinning units can be actuated simultaneously for simultaneously braking the combing rollers of all of the spinning units referring to fig4 and 5 a braking lever 108 is mounted pivotally by a pivot pin 109 as in the preceding embodiment of fig3 said lever 108 is associated at the.