Abstract: A suck back valve comprises a linear actuator which displaces a second diaphragm through a stem, an encoder which detects a displacement amount of the linear actuator, and a flow amount controller for controlling a pilot pressure supplied to an ON/OFF valve mechanism.

Abstract: The invention provides a combination of a nozzle and a vacuum hood. The vacuum hood has a chamber that surrounds the tip of the nozzle and removes residue from the tip by a vacuum which flows in the chamber past the nozzle tip. This vacuum catches and removes residue from the nozzle tip and prevents the reside from interfering with the spraying action or dripping down. The method of the instant invention provides for dispensing a fluid from a nozzle without dripping fluid from the nozzle having a vacuum hood. The method comprises: (a) dispensing a fluid on a rotating semiconductor wafer through a nozzle over the wafer; (b) terminating the fluid flow through the nozzle; (c) creating an upward flow of gas about the dispensing nozzle when the flow of fluid through the nozzle is terminated; (d) capturing any fluid residue from the nozzle in the upward flow of gas; (e) removing the wafer and positioning another wafer; and (f) terminating the upward flow of gas; and repeating the process of steps (a) through (f).

Abstract: A suck back valve is equipped with a second valve by which a flow amount of a pressurized fluid, which is sucked by a third diaphragm, is electrically controlled based on an output of activation and deactivation signals from a main controller. The suck back valve further includes an encoder which detects a displacement amount of the third diaphragm, and outputs a detection signal thereof to the main controller.

Abstract: A suck back valve comprises a valve body including a fluid passage having a first port formed at one end and a second port formed at the other end, and an air supply port for introducing a pressurized fluid; a displacement mechanism provided displaceably at the inside of the valve body, for making displacement in accordance with an action of the pressurized fluid introduced from the air port; a first diaphragm coupled to the displacement mechanism, for making displacement integrally with the displacement mechanism; and a seat section provided to face to the fluid passage, for seating the first diaphragm or making separation from the first diaphragm.

Abstract: A suck back valve in which the response speed of a diaphragm is improved and in which control becomes assured, wherein there is no concern of changes occurring in an amount of sucked fluid, and wherein a system employing the suck back valve is kept small in scale, thereby enabling ease of installation.

Abstract: A suck back valve includes a fitting having a fluid passage formed with a first port at one end thereof and a second port at another end, a valve actuator having a suck back mechanism for sucking a fluid from inside the fluid passage according to a negative pressure action of a diaphragm displaced by a pilot pressure, and first and second electromagnetic valves which increase/reduce the pilot pressure supplied to a diaphragm chamber in accordance with supply and discharge actions. A controller is provided for energizing and deenergizing the first and second electromagnetic valves, wherein said fitting, said actuator and said controller are assembled together as an integral unit.

Abstract: A suck back valve is equipped with a displacement speed regulating device made up of an ER (Electro-rheological) fluid filled in a chamber and whose viscosity changes in correspondence with the size of an external electric field, a coil member which generates the external electric field in response to an applied voltage, and a constriction which regulates a flow amount of the ER fluid between an upper-side chamber and a lower-side chamber of the chamber.

Abstract: A suck back valve is proposed, comprising a suck back mechanism for sucking a coating liquid inside a fluid passage under a negative pressure action of a diaphragm displaced by a pilot pressure, an ON/OFF valve for opening and closing the fluid passage under action of the pilot pressure, and a flow amount control device for controlling the pilot pressure supplied to the ON/OFF valve.

Abstract: A spray tip housing includes a turret member having a stem portion and a handle, an axial passageway having an outlet and an inlet, and a seal insert operatively disposed in the axial passageway. The handle is configured to enter the outlet of the axial passageway to push the seal insert at least partially through the axial passageway. The axial passageway has a rectangular cross section and the handle is tapered and includes a rectangular cross section that is sized to enter the axial passageway. The turret member is movable between a spraying position and a cleaning position, and the handle is made of soft plastic and includes direction indicia for indicating the position of the turret member. The direction indicia includes an arrow-shaped portion for pushing the seal from the axial passageway.

Abstract: A suck back valve is proposed which prevents change in the amount of fluid which is sucked by the suck back valve, and which improves response accuracy of a diaphragm, together with accurately controlling a displacement amount and a displacement speed thereof. A diaphragm displaceably disposed confronting an interior of a flow passage is formed from a first membrane and a second membrane stacked on the first membrane, wherein the first membrane is sucked into contact with the second membrane through holes defined in the second membrane, by activation of a negative pressure generating source which is connected to a chamber through a passage, and wherein the form of the first membrane is maintained by the second membrane.

Abstract: A suck back valve is proposed, comprising a suck back mechanism for sucking a coating liquid inside a fluid passage under a negative pressure action of a third diaphragm displaced by a pilot pressure, an ON/OFF valve for opening and closing the fluid passage under action of the same pilot pressure which is supplied to the suck back mechanism, and a fluid passage switching element for switching the pilot pressure supplied respectively to the suck back mechanism and to the ON/OFF valve.

Abstract: A suck back valve is equipped with a first flow amount control device for controlling a pilot pressure supplied to an ON/OFF valve, and a second flow amount control device for controlling a pilot pressure supplied to a suck back mechanism, wherein the first and second flow amount control devices are operated based on activating and deactivating signals output from a main controller.

Abstract: A suck back valve is proposed which prevents displacement of a diaphragm due to pressure of a supply fluid, together with alleviating concern of changes in the amount of supply fluid which is to be sucked, and enabling ease of installation by making compact the system which employs the suck back valve. A diaphragm is displaced in the direction of arrow A under an activation operation of a linear voice coil type luffing device. Compressed air is introduced into a chamber, wherein the diaphragm is supported under an applied pressure. A coating liquid which is introduced through a fluid passage is supplied onto a semiconductor wafer from a nozzle. When an ON/OFF valve is activated and supply of the coating liquid is prevented, together with activating the linear voice coil luffing device and causing displacement of a plunger in the direction of arrow B, a poppet valve is displaced so that compressed air inside the chamber is output from a fluid output passage.

Abstract: A detent apparatus and method for rotatably retaining a paint spray tip and turret in a holder to permit rotation of the turret to selectively position the tip to a spraying position and a cleaning position and to selectively permit extraction and insertion of the turret with respect to the holder by actuation of the detent apparatus which is preferably made up of a protrusion and mating recess and shoulder, with a spring portion permitting relative movement of the elements of the detent apparatus to permit withdrawal and insertion of the turret with respect to the holder.

Abstract: A nozzle, preferably a nozzle for a spray pipe, designed and arranged for cleaning whilst in operation, comprising a nozzle body (2), in which there is disposed a tightly fitting turnable body (1) having an orifice (9) for shaping a fluid jet and wherein on the nozzle body there are provided structure (2) for securing the nozzle to a supply pipe (4), preferably a spray pipe, characterised in that hole (10), having a diameter approximately equal to that of the supply pipe (4) is bored partly through the turnable body (1), that jet shaping orifice (9), having a smaller opening than the hole (10), is formed as an extension thereof through the turnable body (1) and that jet pod (11), having a diameter approximately equal to the diameter of the supply pipe (4), is bored through the turnable body (1) approximately perpendicular to the first hole (10) and intersects it.

Abstract: A dual mode reversible spray tip seal includes a tip-retaining set screw and a resilient washer in a transverse passageway in a turret of a portable paint spray gun. A cone-shaped taper on the set screw simultaneously urges the washer both axially and radially to axially seal the upstream end of the tip and radially seal the passageway of the turret.

Abstract: There is disclosed an airless spray head having a rotatable turret orifice tip holder with a floating turret seal preloaded with a compression spring within a spray head body having a distal circular rim, a through longitudinal passageway and an intersecting orthogonal bore which receives the cylindrical turret. A retainer nut surrounds and receives the spray head body which is captured by the circular rim, and a low friction washer is located between the rim and the retainer nut. The compression spring is biased against the upstream face of the turret seal by a spring retainer with a boss on its downstream face and an annular groove on its upstream face in which an annular sealing washer is permanently received. The compression spring is mounted on the downstream boss and retained thereon by spring detents of the boss. A second annular sealing washer is located between the downstream face of the retainer and the end of the spray head body.

Abstract: An electrostatic coating machine comprising at least two paint tanks (13A, 13B) for pushing out a paint by a pressure of a hydraulic fluid which one is attached to a rotary base (14) while being electrically insulated from each other, and can be positioned to a coating position opposed to the machine body (3) by the rotation of the rotary base (14) such that while one paint tank is at the coating position, the other paint tank is engaged with a paint charging attachment (22) that is disposed being electrically insulated from the machine body (3) and has a paint supply port (Ps) for supplying a cleaning fluid and a paint of a next color and a drain recovery port (Dr) for recovering drains. Cleaning/paint charging time can be shortened to improve operation efficiency and insulation countermeasure for the paint supply system can be saved.

Abstract: A reversible spray tip holder for connection to a spray gun comprises a union with like quick-disconnect mounts on each of entry and exit ends for connecting to a mounting adaptor which facilitates connection to the spray gun. A base and a tip housing join by means of a base threaded bolt threaded into a matching tip housing threaded recess to comprise the union. In the tip housing is a tip receiver opening into the tip housing threaded recess on one end and extending to the tip housing exit end at its other end which is closed except for an aperture through which the tip receivable within sprays paint. A tip is received and sealed into the tip receiver, secured therein by the base threaded bolt, with a tip nozzle immediately adjacent to and directed through the aperture. A through passageway extends from the adaptor and spray gun through the base and tip housing to the spray tip. Diverging shields on the tip housing preserve an intended spray pattern.

Abstract: There is disclosed the combination of an airless spray head for spraying liquids under high pressure in which an orifice tip holder is positioned in the spray head to locate the orifice tip in a longitudinal through passage of the spray head body and a comminuter mechanism having a turbine mounted within a comminuter casing with a liquid flow header to direct the liquid flow across the turbine blades, causing rotation of the turbine wheel and a coaxially mounted comminuting member to comminute solids in the liquid being sprayed prior to discharge of the liquid to the orifice tip. In the preferred embodiment the comminuting member is a axially fluted cylinder mounted in a cylindrical comminuting chamber.

Abstract: A reversible spray tip assembly with a replaceable tip member keyed to orient an orifice therein to a turret of the assembly and carrying a replaceable member having visually perceptible indicia to identify the size and fan width of the orifice of the tip member installed in the turret assembly. The replaceable member may be in the form of a plug, clip, band, sticker, or tablet insertable into the handle of the turret, or the handle itself may be user-replaceable. Alternatively, thumbwheels may be provided in the handle to display the tip identification indicia.

Abstract: There is provided a reversible spray tip or nozzle used with a spray gun or like device for hydraulically atomizing and spraying liquids such as paint. The spray tip includes a plastic housing having a forward extending spray tip guard integral therewith, a cylindrically shaped rotatable turret member diametrically received for rotation in the housing and having a diametric bore therethrough for receipt of a spray tip insert, and an elongated seal insert axially received in the housing upstream from the turret member. A securing nut rotatably mounted to the housing at the spray gun end thereof secures the reversible spray tip to the discharge end of the spray gun. The enhanced sealing effectiveness of the reversible spray tip permits effective sealing of the assembly by finger tightening of the securing nut.

Abstract: The apparatus for applying granules to a coated asphalt sheet has a nozzle for holding an accumulation of granules, an opening at the bottom of the nozzle for discharging the granules onto the coated asphalt sheet, a buffer chamber positioned in communication with the accumulation of granules, and a vacuum source for reducing the pressure in the buffer chamber to stop the flow of granules through the opening.

Abstract: A draw back valve for fluid applicators for controlling the dripping or deposit of fluid at the nozzle orifice. The invention features a poppet within a stem which serves as a "piston". In the open position, the poppet is disposed within a chamber that has sufficient clearance to permit unrestricted fluid flow. Once it is desired to shut off fluid flow, the poppet slides in the reverse direction and is disposed within a cylinder bore such that the poppet now functions as a "piston" causing the flow to reverse. The reverse flow creates a partial vacuum at the valve "nozzle" thus causing the fluid that was being dispensed to be drawn back into the nozzle, thus, eliminating drips or dried fluid at the tip. The invention is particularly well suited for use in hand-held hot melt glue guns, however, has application to other fields as well such as paint spraying.

Abstract: A spray nozzle includes a central resin nozzle and peripheral catalyst nozzles as well as air nozzles designed to emit streams of air to shape the flow of the resin material from the resin nozzle. The resin nozzle is mounted on a rotary fitting allowing the direction of the resin nozzle to be reversed 180.degree. to permit cleaning of the resin nozzle. The air nozzles consist of passageways through the rotary fitting that are aligned with respective sources of air pressure when the rotary fitting is positioned to permit spraying of resin through the resin nozzle.

Abstract: According to one embodiment, a nozzle for introducing a fluid comprises a first conduit having a first end and a second conduit having a second end. The second conduit is disposed substantially concentrically with the first conduit. The first end is offset from the second end. A third conduit having a third end is provided with the third conduit being disposed substantially concentrically with the first conduit and the second conduit and the third end being offset from the first end and the second end. Another embodiment provides a method wherein a first fluid conveying conduit, a second fluid conveying conduit and a third fluid conveying conduit are provided. The second fluid conveying conduit substantially surrounds the first fluid conveying conduit and the third fluid conveying conduit substantially surrounds both the first fluid conveying conduit and the second fluid conveying conduit. A first fluid flows through the first fluid conveying conduit.

Abstract: An intermittent coating apparatus for intermittently coating a continuously running base member with a coating material includes a nozzle for discharging the coating material toward the base member and an absorption unit for controlling a flow of the coating material. The nozzle has a slit opened toward the base member and a manifold connected to the slit. The absorption unit includes a head having an inlet, an outlet, and a passage connecting the inlet and the outlet. The head is located in a housing. The absorption unit also includes a driving unit for sliding the head in the direction of a shaft located in the housing. By the sliding operation of the head, an absorption space is formed between an end face of the head and the manifold. In order to stop the coating operation, the supply of the coating material from an external supply opening to the inlet of the head is stopped by the sliding movement of the head.

Abstract: A flat tip holder for an airless material spray system which incorporates a body adapted for attachment to an airless spray gun and a rotatable flat tip holder unit within the body for positioning the flat tip in a spray or cleaning position with a positively sealing element provided in the holder to seal the tip and holder along the material flow path when the unit is in either the spray or cleaning position.

Abstract: A device and method for venting a conduit and allowing fluid flow through the vented conduit includes an upstream conduit, downstream conduit, and a support for holding the upstream and downstream conduits with their upstream and downstream passageways aligned and maintaining a gap between the adjacent ends of the conduits. The upstream passageway includes an acceleration nozzle for accelerating the velocity of the fluid flow so that the pressure exerted by the fluid on the walls of the upstream passageway is substantially reduced and the reduced pressure is maintained across the gap. The downstream conduit includes a downstream passageway which maintains the accelerated velocity of the primary fluid and which conducts accelerated fluid to a deceleration nozzle. A plurality of the devices may be connected in series and/or multiple gaps may be created between the conduits using intermediate conduits in order to create multiple gaps.

Abstract: A pump dispenser connected to a container of liquid has a first piston reciprocatable in a first cylinder for pumping a quantity of liquid at each depression of the piston. A valve member received within a channel in the first piston is spring biassed into a position in which a dispensing outlet is normally closed and is movable to release liquid in response to excess liquid pressure in the first chamber. A cylindrical extension to the valve member defines a conduit communicating with liquid in the container and is separable from the valve member to open a liquid inlet port for recharging the first chamber. A second piston is movable in tandem with the first piston and cooperates with a second cylinder to provide suction on a return stroke of the pistons which is utilised to remove residual liquid from a dispensing channel delivering pumped liquid to a nozzle. Residual liquid collected in the second chamber is returned to the container during the next subsequent actuating stroke of the pistons.

Abstract: There is disclosed a spray head of improved design for airless spraying of liquids which utilizes a rotatable turret member to provide for reversing of the position of the orifice spray orifice tip for cleaning purposes. The rotatable turret member houses a conventional flat tip orifice without compromising the sealing, or the strength and useful life, of the spray assembly. To this end, a cylindrical turret member is formed of two sectored cylinders, one of which has a recess which receives a conventional flat tip. The two sectored cylinders are joined and secured in a cylindrical turret subassembly by interlocking keys and slots, preferably at opposite ends. The spray head also has a spray guard of generally conventional design with a key and arcuate slot connection to index the position of the rotatable turret member at cleaning and spraying positions.

Abstract: An OFF/OFF valve including a fluid passage formed in the valve body, and having a valve seat, a smaller diameter portion extending from the valve seat on a downstream side of the valve seat, and a larger diameter portion extending from the smaller diameter portion on a downstream side of the smaller diameter portion. A valve element is disposed so as to be movable between a position adjacent the valve seat and a position within the larger diameter portion. The valve element is driven by a valve element driving assembly. When the valve is closed, the valve element moves toward the valve seat. When the valve element moves within the smaller diameter portion, the fluid which has passed through the valve element is drawn back due to the pumping effect of the valve element before the valve element finally reaches the valve seat and the valve is completely closed.

Abstract: An apparatus and a method of injecting a liquid are provided, especially for the intermittent, essentially drip-free injection of a liquid into a waste heat removal system in a spacecraft. The injection apparatus includes a housing having an inlet, an outlet, a discharge channel communicating with the outlet, and a receiving chamber controllably communicating with the discharge channel. A piston is movably arranged in the housing to define a boundary of the receiving chamber. A valve arrangement operates in response to the motion of the piston to respectively open or close the path of liquid communication between the receiving chamber and the discharge channel. This apparatus carries out the method, whereby when delivery of injection liquid is to be stopped any liquid remaining in the discharge channel is sucked out into the receiving chamber. Then, when delivery of injection liquid is to be resumed, the retained liquid is moved from the receiving chamber into the discharge channel.

Abstract: An improved nozzle assembly for dispensing liquid is disclosed. In a first embodiment of the invention, the liquid dispenser comprises a nozzle assembly with an expansive cavity at its dispensing end. When the flow of liquid in the dispenser is halted, a pocket of liquid formed inside the cavity ties the liquid in the nozzle to the liquid in a drop formed at the tip of the nozzle. Thus, when "suck-back" is applied, the drop is pulled into the cavity and up the nozzle, leaving at most a very small and stable amount of liquid inside the cavity. In a second embodiment of the invention, an inner nozzle tube extends beyond the end of an outer nozzle tube, creating an external annular recess which captures and holds a drop of liquid over the end of the nozzle. After suck-back, the drop is pulled up into the nozzle, leaving a small, stable amount of liquid in the annular recess.

Abstract: The present invention relates to a low-cost, disposable spray tip for airless spraying, which has an orifice tip holder that is reversible between spraying and cleaning positions. The orifice tip is mounted in a rotatable turret member which is sealed in the assembly by a piston which is held against the rotatable member by a retainer threadably engaged in the body. The retainer is provided with a through running bore, portion of which is counter bored to receive the body of the sealing piston which is preferably retained therein by resilient annular sealing members. The body and spray guard are formed as a single piece, preferably by die casting or molding, and the through running passage and orthogonal bore are formed concurrently during the molding of die casting operation. The only additional components to be assembled are the retainer and the piston seal assembly and the rotatable turret member and the hand assembly.

Abstract: A spray tip assembly for airless fluid spraying includes the spray tip assembly and an adapter for mounting on a spray gun barrel. The spray tip assembly has a housing with a longitudinal through-running passage way in which a member carrying an orifice spray tip is mounted. The discharge end of the spray tip assembly includes a spray guard and the opposite end of the spray tip assembly is secured by the adapter to the barrel of a spray gun through which material to be sprayed is conducted to the spray tip assembly. In one embodiment of the invention the orifice of the spray tip assembly is carried in a cylindrical body which is rotatably mounted in the housing of the spray tip assembly so that the orifice can be reversed for cleaning purposes. In another embodiment the orifice is fixedly seated in the tip assembly and is not reversible.

Abstract: A two piece non-moving nozzle assembly of which one piece includes an orifice with an internal extension acting as a solids barrier and the second piece providing channels for liquid and air passage. At a predetermined interval, air is automatically forced through the orifice in the opposite direction to liquid flow. When air is forced through the orifice, solids are removed.

Abstract: A reversible spray tip assembly having a housing formed with a longitudinal bore and a transverse bore, a cylindrical turret having a spray tip orifice rotatably and removably supported in the transverse housing bore, and a floating seal disposed in the longitudinal housing bore and having a concave sealing face adapted for sealing engagement with the turret. The spray tip assembly includes a seal adaptor disposed in the longitudinal housing bore upstream of the floating seal which, upon securement of the spray tip assembly onto a supply line by a threaded coupling, causes the seal to be forced into predetermined initial sealing contact with the turret regardless of how tightly the coupling is screwed onto the supply line.

Abstract: There is disclosed a rotatable orifice tip holder for use in airless spraying which has an orifice tip member mounted in a transverse through bore of the holder. The through bore has a major portion of a first, large diameter and a lesser portion of a substantially lesser diameter. The orifice tip member is press fitted into the through bore with its hemispherical head received within the lesser diameter portion of the through bore and a sealing plug is permanently seated, by a press fit into the major portion of the through bore. The sealing plug has a through passageway of a small diameter and a counter bore of greater diameter but lesser length and is oriented in the through bore of the holder with the counter bore adjacent the inlet face of the orifice tip member. The volume of the counterbore is maintained at a minimal volume which provides adequate diffusion of the spray jet during the cleaning operation yet which exhibits minimal frictional pressure loss during spraying.

Abstract: The present invention relates to a low-cost, disposable spray tip for airless spraying, which has an orifice tip holder that is reversible between spraying and cleaning positions. The orifice spray tip is mounted in a rotatable member by a retainer threadably engaged in the body. The body includes a through running passage opening at the back and the front of the body and which receives the sealing piston secured in the passage by the retainer. An orthogonal bore opening at the top and the bottom of the body intersects the passage and a cylindrical turret member is permanently but rotatably mounted in the bore. The body and spray guards are formed as a single piece, preferably by die casting or molding, and the through running passage and orthogonal bore are formed concurrently during the molding or die casting operation. The only additional components to be assembled are the retainer and piston seal assembly and the rotatable turret member and handle assembly.

Abstract: A fuel injector system for a combustor of a gas turbine engine includes first and second fuel injectors rendered operative to discharge fuel to the combustor during a high power regime of engine operation and rendered non-operative during a lower power regime of engine operation. The first and second fuel injectors include respective first and second fuel discharge passages in fuel flow communication to one another and to the combustor via associated fuel discharge lips to sustain a flame region. The first and second fuel injectors are operatively associated with respective first and second air discharge means having air discharge lips for discharging air to the combustor for sustaining the flame region therein. When the fuel injectors are rendered non-operative, different pneumatic pressures are established at the fuel discharge lips to purge fuel from the fuel injectors to the combustor.

Abstract: A multiple orifice spray nozzle having reversible orifice cleaning capability for use with high pressure liquid spraying systems. A first embodiment offers selection of a first or second orifice by vertical movement of an orifice selection cylinder. A second embodiment offers selection of a first or second orifice by rotation of the orifice selection cylinder about a vertical axis.

Abstract: An apparatus for efficiently applying a subject liquid on an object of interest is disclosed. The apparatus includes a metering device (30), a discharge tube (280) and a nozzle (290). The metering device (30) includes a cylinder (115) and a piston (165) which is operatively disposed within the cylinder to define a metering chamber (177) ahead of the piston. The metering device (30) includes a liquid inlet (108) and a liquid outlet (109). Fluid flow to the liquid outlet (109) is controlled by a check valve (130). The piston (165) is driven forwardly through a working stroke to force the liquid in the metering chamber (177), out of the metering chamber, and past the check valve (130). The piston (165) breaks the plane of the open end of the cylinder on each working stroke to preclude entrapment of air in the metering chamber (177), and thus provide for a more accurate metering. The nozzle (290) includes a fluid passageway (301) which is disposed in fluid flowing relation relative to the metering device (30).

Abstract: A spray tube nozzle adapted to be cleaned during its operation. The nozzle includes a nozzle head having an inlet connectable to a conduit and an outlet for spraying liquid. Within the nozzle head is located a rotatable element defining a through-hole. The through-hole is shaped in such a way that the opening at one end is of relatively small cross-section and at the opposite end of a relatively large cross-section. The rotatable element is sealingly arranged in the nozzle head and has an external groove. The rotatable element can be positioned in at least a first rotational position to facilitate flow of spraying liquid from the conduit, to the nozzle inlet, and through the through-hole in the rotatable element, to the nozzle outlet for forming spray jets at the outlet. A second rotational position allows liquid to be flushed through the conduit by flow of the spraying liquid from the inlet, through the groove, and exiting the nozzle through a flush hole.

Abstract: A device for application of a glue strip on a movable paper web by means of at least one glue sprayer for glue under pressure. The device incoporates a valve housing (12) for two diaphragm-magnetic valves (13, 14) or the like, the spring loaded rubber diaphragms (23, 24) of which are provided between one inlet chamber (19, 20) and one outlet channel (21, 22) each, intended for glue and for a rinsing liquid respectively. The outlet channels (21, 22) are interconnected and adapted to open into a common nozzle (31) with a fine outlet opening (32) located at some distance from the paper web (35). The piston (27, 28) of each magnetic valve (13, 14) acting upon the rubber diaphragm (23, 24) has a very short stroke.

Abstract: An improved metering dispenser system for delivering a fixed or variable measured quantity of a high viscosity material such as adhesives or sealants for application to a substrate is disclosed. It uses an Archimedian screw pump having a stator formed with a spiral cavity therethrough, and a spiral rotor which is driven by a variable speed drive motor. The stator has a nozzle attached to its outlet end, the inlet end thereof being in fluid communication with a reservoir for the material. The dispenser system is adapted for use in combination with a robotic system so that the nozzle is manipulated thereby. The rotational speed of the drive motor is controlled in response to a signal representative of a nozzle velocity so that the nozzle can apply a ribbon of the material with a fixed width to the substrate despite nozzle velocity variations. When the nozzle is about to come to a stop, the drive motor is rotated in a reverse direction so as to cause the nozzle to stop discharging the material instantly.

Abstract: A device for vacuum-assisted transfer of fluid from one container to another via a conduit and having an occluder positioned between the containers includes apparatus and method for clearing fluid from the conduit downstream of the occluder by forcing the fluid upstream of the occluder.

Abstract: The reversible spray tip assembly has a rotatable turret which may be reversed for cleaning and unclogging. The function of a diffuser is performed by a diffusing member which serves to retain the airless spray tip carbide within the rotatable member and which has an arc shaped aperture located off center and parallel to the circumference of the diametrical passage so as to in effect deflect the stream of fluid flowing through the tip sufficiently to prevent spraying of a coherent stream.

Abstract: A device for sealing two-piece capsules has a capsule carrier and a capsule holder which are movable relative to one another for the purpose of attaching a cap to a capsule body. In order to bond a cap firmly and tightly to the body of a capsule, the device has a nozzle for applying a viscose sealing material to the inside of the cap. To prevent an excess of sealing material from being applied to the cap, the nozzle is provided with a vacuum mechanism in the form of an annular channel by means of which excess sealing material is removed during the application.

Abstract: There is disclosed a spray tip useful for high pressure, airless spraying which has an orifice tip holder that is reversible between spraying and cleaning positions and that is interchangeable with other holders supporting orifice tips of varied diameters and capacities. The invention particularly provides a turret member as the orifice tip holder which has a size that permits it to be used as an ejector pin or member for removal of the seal from the spray tip. The turret member is sealed in the assembly by a floating seal in which the liquid line pressure provides the force to maintain the seal against the cylindrical member. The forward end of the floating seal has a seal face formed of a very hard, preferably reinforced plastic.