Stop device for the spindles of a textile spinning machine

A stop device for a spindle of a textile spinning machine comprising a support body adapted to be secured to a textile spinning machine adjacent a spindle, a brake shoe having a brake surface contoured to the configuration of a spindle for frictionally halting spindle rotation, piston means disposed between said brake shoe and said support body for moving said brake shoe toward a braking position thereof, said piston means defined by first and second relatively movable piston parts, means for articulately connecting said first piston part to said brake shoe, lever means activated by an operator for engaging said second piston part, first spring means for transmitting a force created by the actuation of said lever means against said second piston part through said first spring means to said first piston part, second spring means for biasingly returning said second piston part to a nonbraking position upon the deactivation of said lever means whereby said brake shoe is brought to a nonbraking position through said first piston part and said articulately connecting means, means for limiting the relative movement of said first and second piston parts away from each other in said nonbraking position, and means for preloading said first spring means when said first and second piston parts are in their position of limited movement.