Abstract:
An apparatus for the application of liquid adhesives to a substrate comprises a supply container for the adhesive and an applicator nozzle which is connected via a conduit to the supply container and has a slit-like outlet opening which communciates via a supply passage with a spreading chamber; at the slit-shaped outlet opening a doctor blade secured by a clamp support is arranged.
Abstract:
A supply line for supplying a sealant from a sealant supply source to a sealing robot has pressure sensors and is coupled to relief valves through branch lines. If the pressure in the supply line excessively rises or drops, then the relief valves are opened to release the pressure from the supply line and the supply pump is inactivated. The pipes, devices, and pump on the supply line are therefore protected from damage. The sealing robot has an sealant applicator gun movable with respect to an article to which the sealant is to be applied by the sealing robot. A pump driving device is controlled to vary the rate at which the sealant is discharged from the pump as a function of the speed of relative movement of the sealant applicator gun with respect to the article.
Abstract:
A system for applying sealant material to the welded seams of an automobile body including a reciprocating piston pump for supplying the material under pressure from a reservoir to an overhead distribution manifold. From the manifold the material is supplied to a plurality of extrusion guns through drop lines, each of which includes a pressure regulator and volumetric metering gear pump for maintaining a constant flow rate to the guns irrespective of pressure changes which may occur in the distribution manifold.
Abstract:
A controlled temperature hot melt adhesive dispensing system including three closed loop temperature control arrangements along a flow path for hot melt adhesive extending from an upstream adhesive source to a downstream adhesive dispenser. As disclosed, each closed loop temperature control arrangement includes a comparator which compares the temperature sensed by a temperature sensor with a setpoint temperature to produce a control signal for a heater in the temperature control arrangement. The temperature control loops are located along the adhesive flow path so that the second closed loop temperature controller is upstream from the first closed loop temperature controller; and the third closed loop temperature controller is upstream from both the first and second temperature controllers. A first feedback circuit scales and integrates the control signal from the first location to produce a first feedback circuit output which adjusts the setpoint temperature at the second location. A second feedback circuit scales and integrates the control signal from the second location to produce a second feedback output which adjusts the third setpoint temperature. In this way, the three closed loop temperature control arrangements are cascaded so that the control signals developed are coupled, directly or indirectly, to each upstream closed loop temperature control arrangement.
Abstract:
A manually operated actuator is described with which small incremental motions of a rod are obtained to advance a piston of a prefilled syringe. The device employs a reciprocally actuated drive element with a hole through which the rod passes freely when the drive element is in a release position. When the drive element is pivoted to a rod engaging position a pair of edges formed by the hole engage the rod and advance it an increment depending upon the amount of linear movement of the drive element. A back-up inhibitor is employed to prevent the rod from moving back when the drive element is returned to a release position. The back-up inhibitor is syringe responsive by employing a mechanism which causes engagement of the rod by the inhibitor when a syringe is attached to the actuator housing. A syringe with specially adapted flanges is described for use with the actuator.
Abstract:
Process and apparatus for metering liquid colorant from a primary color reservoir having a valve for controlling the liquid flow into a collecting container. The process comprises the steps of disposing the valve into required position, operating a drive member to open and close the valve, permitting the liquid colorant to flow into the container, preparing three stages of successive metering controls, and automatically metering the liquid colorant through one or more stages. The apparatus comprises a plurality of reservoir bases, tilting device, operating member of the valve and balance for measuring the weight.
Abstract:
The invention concerns a device for mixing and dose feeding a product of one or several components.This device comprises a mixing chamber 3 within which is freely mounted a static-type mixing member 7 which thereby can move within the chamber 3 along a predetermined path; this member is associated with return means 9 arranged to repel it in the direction S.sub.2 from the discharge toward the inlets of the chamber; when in motion during the product feed operation, the member 7 permits projecting product doses with high accuracy and without dispersion while also achieving thorough mixing of the product components.
Abstract:
Apparatus for applying a coating to a surface of a moving workpiece comprises a coating dispenser having at least one coating outlet spaced apart from the workpiece surface for dispensing a stream of coating. A dispenser control unit is operatively coupled with the dispensing means for initiating and terminating the dispensing of the stream of coating as predetermined parts of the workpiece surface come into alignment with the coating outlet. The invention provides an anti-tailing device coacting with the stream of coating intermediate the outlet and the workpiece surface for substantially preventing tailing of the stream of coating following termination of dispensing thereof.
Abstract:
A nozzle and associated apparatus for controlling the thickness of liquid coating on continuous webs which produces a thin jet of fluid for impingement across the width of moving web having a liquid coating thereon, the fluid in the portions of the jet on either side of the center of the nozzle having components of motion toward the edges of the web. One form of nozzle structure for achieving such lateral movement of the fluid issuing from the nozzle has a centrally positioned fluid inlet port to an inner plenum chamber, the port having a cross sectional area at least several times the cross sectional area of the nozzle orifice. Another form of nozzle structure for accomplishing this purpose involves baffle means in the path of the fluid flowing through the nozzle which changes the direction of flow of the fluid so as to give the fluid on either side of the center of the nozzle a component of motion toward the edges of the nozzle. Still another form of nozzle structure combines the foregoing features with the so-called curved orifice nozzle where operating conditions indicate the desirability of some build-up of coating on the central portion of the web. The method involves impinging fluid against a liquid coating on a surface of a moving web with the fluid impinging against the liquid coating across the width of the web so that on either side of the center of the web there is a component of motion of the fluid toward each associated edge of the web, whereby excess liquid coating on the web has a component of motion toward each edge of the web.
Abstract:
A method and apparatus for the handling of hot melt materials and the like for coating a web with the hot melt. Hot melt is fed from a source through a filter to a heated tank, and from the heated tank it is pumped to an extrusion head. Pumping of the hot melt from the tank to the extrusion head is accomplished solely by providing pressurized gas at slightly more than one atmosphere pressure over the hot melt in the tank. The source pressure of the hot melt is isolated from the supply pressure at the extrusion head, and the web to be coated is passed in operative relationship with the extrusion head. The hot melt is metered in a thin film flowing over heated surfaces in order to insure thermal uniformity without agitation. The level of hot melt in the tank is maintained at a predetermined level, and the extrusion head is provided at substantially the same predetermined level so that the extrusion will not overflow or drain when the pressurized gas from the tank is vented. The hot melt is fed into the tank and withdrawn from the tank in such a way that bubbles in the hot melt come to the surface and pop and/or form a foam on the top of the hot melt so that the withdrawn hot melt is substantially air free.