Two-for-one twisting spindle

A two-for-one twisting spindle comprising;

• a spindle rotor, a stationary portion and a hollow spindle axle, compressed-air-actuated threading means in juxtaposition with said hollow spindle axle above said spindle rotor operative in an injector-like manner, a first compressed air passage extending through said staionary portion of said spindle, a threading means including a compressed air cylinder having an axis intersecting with said hollow spindle axle at right angles thereto, said compressed air cylinder having two openings diametrically opposte each other and in alignment with said hollow spindle axle, a piston displaceable in said compressed air cylinder for clamping or cutting a yarn passing through said hollow spindle axle, and a second compressed air passage leading through said stationary portion of said spindle communicating with said first compressed air passage.

A two-for-one twisting spindle comprising;

• a spindle rotor, a stationary portion and a hollow spindle axle, a compressed-air-actuated yearn threading means disposed in said hollow spindle axle above said spindle rotor and acts in an injector-like manner, a compressed air cylinder in juxtaposition to said hollow spindle axle, a compressed air passage extending through said stationary portion of said spindle to said compressed air cylinder, said compressed air cylinder intersecting said hollow spindle axle at right angles above said threading means, said cylinder having two openings located diametrically opposite each other and in alignment with the hollow spindle axle, a double-acting stepped piston in said compressed air cylinder displaceable and displaceable therein for cutting a yarn passing through said hollow spindle axle, said stepped piston having a part in alignment with said hollow spindle axle when said stepped piston is in its normal position, a first working chamber defined by a smaller diameter on said stepped piston which chamber is connected directly to said compressed air passage, and second working chamber defined by a larger diameter on said stepped piston which secondchamber is connected to said compressed air passage, and a throttle connected said second chamber to said compressed air passage.