Adhesive metering device
AssigneeS&S Corrugated Paper Machinery Co., Inc.
InventorsStephen S. Flaum, Martin J. Leff
Life of this patent
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Abstract
A glue applicating means is constructed with an elongated shoe floatingly mounted alongside of and urged toward a glue applicator roll by a fluid controlled biasing means. A longitudinally extending depression in the shoe is substantially closed by the glue roll to define a glue cavity to which glue is fed by a positive displacement pump. The shoe is mounted so that the downstream end of the shoe is movable away from the glue roll automatically as required to permit glue to exit from the cavity at the same rate it is supplied thereto. This provides what is effectively a self-adjusting nozzle or metering slot extending the full length of the shoe and through which glue is forced from the cavity to form a thin layer of uniform thickness on the outside of the glue roll.
Claims17
Fluid metering means including a fluid carrying cylinder for applying a fluid film to a workpiece element moving relative to said cylinder;
- said fluid carrying cylinder being mounted for rotation on its relatively stationary cylindrical axis;
- shoe means extending parallel to said cylindrical axis;
- said fluid carrying cylinder having an outer cylindrical surface and said shoe means having a side confronting a portion of said cylindrical surface;
- a fluid cavity extending generally parallel to said cylindrical axis;
- said fluid cavity being formed by a depression in said side of said shoe means and being partially bounded by a portion of said cylindrical surface;
- first means engaging said cylindrical surface while said cylinder rotates and sealing said fluid cavity along its upstream edge;
- a fluid distribution slot partially bounded by said cylindrical surface and positioned along the downstream edge of said fluid cavity;
- said slot providing the sole opening through which fluid exits from said cavity;
- means movably mounting said shoe means to permit said fluid distribution slot to vary in thickness;
- biasing means urging said fluid distribution slot to close;
- a supply of essentially incompressible fluid;
- delivery means to deliver fluid under pressure from said supply to said fluid cavity at a known rate which is substantially independent of pressure in said fluid cavity and thereby create pressure within said fluid cavity urging said fluid distribution slot to open;
- said shoe means assuming an equilibrium position, under the control of opposing forces generated by said biasing means and said delivery means, whereby fluid is forced from said cavity through said slot to form a controlled fluid film on said cylindrical surface of said fluid carrying cylinder with said fluid film, without doctoring, being of a character suitable for application in final usable form directly to a workpiece element;
- and means acting independently of fluid viscosity and pressure variations over substantial ranges to synchronize operation of said delivery means with rotational speed of said fluid carrying cylinder;
- said delivery means maintaining said fluid cavity filled with fluid whereby, independently of fluid viscosity and rotational speed variations over substantial ranges, fluid is forced from said cavity through said slot at a rate equal to the rate at which said delivery means delivers fluid to said cavity.
Dependencies are inferred from the claim text.