Low shear gravity controlled yarn finish supply system

A pumpless, nonrecirculating, low shear, gravity controlled, yarn finish supply system for yarn finishes sensitive to fluid shear comprising

• a supply tank
• a distribution tank
• a finish applicator
• a finish applicator supply pan
• a first tube opening vertically to the atmosphere above the level of yarn finish in the finish applicator supply pan and communicating with
• a conduit between the distribution tank and finish applicator supply pan
• a second tube communicating with the top of the distribution tank and said second tube extending downward into said first tube and to an opening within the first tube just at the level of the yarn finish in the finish applicator supply pan, said opening being horizontal
• conduit communicating between the supply tank and the distribution tank
• valves in each of the conduits communicating between the supply tank and distribution tank and between the distribution tank and the finish applicator supply pan
• a liquid level switch at the bottom of the distribution tank
• a liquid level switch at the top of the distribution tank
• electrical wiring connecting each liquid level switch to
• electrical relay control means and means to open and close said valves
• whereby the yarn finish is supplied to the supply pan with the level controlled by intermittent admission of air to the top of the distribution tank through the second tube;
• as the level of yarn finish in the supply pan drops due to use by the finish applicator, the level in the first tube, which communicates with the supply pan, also drops uncovering the opening at the end of the second tube permitting flow of air, which flows through from the opening in the first tube and into the second tube into the distribution tank releasing an equal volume of yarn finish to flow through the conduit between the supply pan and the first tube, raising the level in both the pan and first tube until the opening in the second tube is covered and sealed, preventing further flow of air until the level drops again due to use by the finish applicator, repeating the controlled level yarn finish supplying process;
• also
• whereby the yarn finish is automatically supplied to the distribution tank from the supply tank by closing the valve, through the relay control means and means to open and close the valve, in the conduit between the distribution tank and the supply pan, by the yarn finish level being low enough to activate the liquid level switch at the bottom of the distribution tank which also opens, through the relay control means and the means to open and close the valve, the valve in the conduit between the tanks;
• as the yarn finish level rises by flow through the conduit between the tanks it activates the liquid level switch at the top of the distribution tank which, through the relay control means and opening and closing means reverses the valve positions, closing the valve between the tanks and opening the valve in the conduit between the distribution tank and supply pan.