Clamping device for clamping a thread on a spindle of a spinning or twisting machine, and spinning or twisting machine

The invention relates to a clamping device (1; 101; 201; 301) for clamping a thread on a spindle (2; 102; 202; 302) of a spinning or twisting machine, comprising a clamping element (3; 103; 203; 303), which is fixed in relation to the spindle (2; 102; 202; 302), and a clamping element (5; 105; 205; 305), which is axially displaceable in relation to the fixed clamping element (3; 103; 203; 303), in which the axially displaceable clamping element (5; 105; 205; 305) is arranged and mounted in relation to the fixed clamping element (3; 103; 203; 303) in such a way that the thread can be clamped in a clamping gap (12; 112; 212, 312) of the clamping device (1; 101; 201; 301), wherein the clamping device (1; 101; 201; 301) has a partially resiliently deformable dust sealing mechanism (25; 125; 225; 325) to seal an intermediate space (22; 122) between the two clamping elements (3, 5; 103, 105; 203, 205; 303, 305), which dust sealing mechanism is resiliently deformable in the radial direction (26; 326) depending on a rotational speed of the spindle.