Ringspinning system for producing a yarn and method for stopping the supply of filaments to a drafting stage of a ringspinning system

A ringspinning system for producing a yarn, the ringspinning system comprising:

• a bobbin holder for holding a bobbin from which a first filament is supplied,
• a drafting stage for drafting the first filament together with a second filament, which is fed to the drafting stage, and
• a spindle, which is provided downstream of the drafting stage on which the ring spun yarn is wound up,
• wherein the ringspinning system further contains:
• at least one sensor for detecting a breakage of the first and/or second filament and/or a roving comprising the first and second filaments, which roving comes out of the drafting stage, and
• a clamp assembly comprising a clamp for fixing the second filament in the case that the sensor detects the breakage, wherein the clamp is provided adjacent the bobbin holder, and wherein the clamp assembly comprises a mounting plate which is placed adjacent to the bobbin, the mounting plate arranged perpendicular to a rotation axis of the bobbin such that the rotation axis of the bobbin extends through the mounting plate, and a first clamp arm and a second clamp arm being rotatable with respect to each other about an axis, each of the first and second clamp arms having a fixing surface to fix the second filament therebetween.