extends via an essentially 90 u00b0 transition into an outer carrier ring r carrier ring r is concentric to braking band s optionally carrier ring r may be made as a separate structural component and connected with holding membrane m the bend l defines an outer annular region 9 of holding membrane m said outer annular region 9 contains area portions d fig4 each having reduced wall thickness s 1 smaller than the normal membrane wall thickness s 2 said area portions d are distributed in the circumferential direction the area portions d e g form oval intermediate spaces fig3 between spring spokes e each e g of wall thickness s 2 said spring spokes are arranged essentially like beams and are integrated into the annular region 9 of holding membrane m the ratio between wall thickness s 2 and wall thickness s 1 may be about 5 1 in case of a wall thickness s 2 of about 1 0 mm wall thickness s 1 may be about 0 2 mm at the side where yarn y runs below braking band s annular region section 9 is formed with an essentially smooth surface 12 at the rear side within annular region section 9 groove shaped depressions are formed due to the reduced wall thickness s 1 the area portions d can be formed oval and may be oriented essentially radially with respect to the axis of yarn braking body a this is also true.