Patent ID: 7739862

Claim:
Yarn clamping device for underwinding yarns on spindles of a ring spinning or ring twisting machine, wherein on the spindle below an underwinding crown a clamping ring and at a distance therebelow a radially protruding collar are provided; wherein at a distance between the clamping ring and the collar an axially displaceable clamping sleeve is located on the spindle; wherein the clamping sleeve can be displaced by means of an actuating device between a clamping position defined by the contact against the clamping ring and an open position defined by the contact against the collar for opening or closing a clamping cleft; and wherein the clamping sleeve is equipped with radially protruding means for the operation of the actuating elements of the actuating device and with elements for fixing the position of the clamping sleeve at least in the clamping position and the application of a clamping force; wherein the actuating elements and the radially protruding means are held together elastically on the clamping sleeve radially to the spindle axles via angular surfaces; and wherein the direction of action of the actuating elements relative to the clamping sleeve can be switched over in such a way, that, depending on the programme of the spinning machine, with increasing RPM the open position and at decreasing RPM the clamping position can be activated.