Method and apparatus for wetting thread in a double twist twisting spindle

In the double twist twisting of a thread drawn from a delivery bobbin, passed through a hollow twist spindle and then directed outwardly into a balloon pattern, the improved method for wetting said thread with a liquid as a treating agent which comprises:

• conducting the thread in contact with a wettable surface during said double twist twisting;
• passing said liquid through openings in said wettable surface while supplying the liquid to said openings in a discontinuous stream under regulated pressure impulses for application onto the wettable surface contacted by the thread and in a measured amount providing a predetermined liquid takeup by the thread.

In a double twist twisting apparatus having a hollow twist spindle for at least one thread delivery bobbin and also having a balloon limiting mantle with a thread contacting surface encircling the twist spindle to limit the outward balloon path of thread which is drawn from the bobbin, passed through the hollow spindle and then directed outwardly into a rotating balloon pattern, the improved means for applying a liquid as a thread wetting agent onto said thread contacting surface which comprises:

• dosing means including a nozzle positioned within said balloon limiting mantle to direct said liquid as a jet or spray under repeated pressure impulses onto said thread contacting surface;
• and
• liquid feed control means including an impulse generator operatively connected with said dosing means to regulate said pressure impulses.

In a double twist twisting apparatus having a hollow twist spindle for at least one thread delivery bobbin and also having a thread contacting surface arranged in the path of thread being drawn from the bobbin, passed through the hollow spindle and then directed outwardly into a rotating balloon pattern, the improved means for applying a liquid as a thread wetting agent onto said thread contacting surface which comprises:

• dosing means to direct said liquid under repeated pressure impulses onto said thread contacting surface;
• a feed pump to supply said liquid to said dosing means under a constant pressure;
• liquid feed control means including a valve member in said dosing means for producing pressure fluctuations and an impulse generator operatively connected to said valve member for repeated movement between a closed valve position and an open valve position transmitting said constant pressure to the liquid being directed onto said thread contacting surface, thereby regulating said repeated pressure impulses.

In a double twist twisting apparatus having a hollow twist spindle for at least one thread delivery bobbin and also having a thread contacting surface arranged in the path of thread being drawn from the bobbin, passed through the hollow spindle and then directed outwardly into a rotating balloon pattern, the improvement for applying a liquid as a thread wetting agent onto said thread contacting surface which comprises:

• dosing means to direct said liquid under repeated pressure impulses onto said thread contacting surface, said dosing means including a plurality of variable pressure pumps, each feeding said liquid to the thread contacting surface of an individual twist spindle and being connected in parallel with a common liquid supply means;
• and
• a single impulse generator operatively connected with said variable pressure pumps to impart said repeated pressure impulses to the liquid passing through each pump.

In a double twist twisting apparatus having a hollow twist spindle for at least one thread delivery bobbin and also having a thread contacting surface arranged in the path of thread being drawn from the bobbin, passed through the hollow spindle and then directed outwardly into a rotating balloon pattern, the improvement for applying a liquid as a thread wetting agent onto said thread contacting surface which comprises:

• dosing means comprising a variable pressure piston pump to direct said liquid under repeated pressure impulses onto said thread contacting surface;
• and
• liquid feed control means including an impulse generator operatively connected with said dosing means to regulate said pressure impulses.

In a double twist twisting apparatus having a hollow twist spindle for at least one thread delivery bobbin and also having a thread contacting surface arranged in the path of thread being drawn from the bobbin, passed through the hollow spindle and then directed outwardly into a rotating balloon pattern, the improvement for applying a liquid as a thread wetting agent onto said thread contacting surface which comprises:

• dosing means comprising a diaphram pump to direct said liquid under repeated pressure impulses onto said thread contacting surface;
• and
• liquid feed control means including an impulse generator operatively connected with said dosing means to regulate said pressure impulses.