Apparatus and method for dispensing fluid material

B - Operations – Transporting – 05 – B

Patent

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B05B 12/00 (2006.01) B05B 7/12 (2006.01) G01F 11/02 (2006.01)

Patent

CA 2222927

An apparatus (50) and method for dispensing fluid material (55) from a dispensing gun (53) onto a workpiece (17) includes a metering cylinder (56) having a metering chamber formed therein with a pair of variable volume chamber portions (66,67), a valve assembly (52) connected to a supply of fluid material (51), thedispensing gun and to the chamber portions, and a control (58) connected to a meter actuator (60) connected to the metering cylinder and a valve actuator (59) connected to the valve assembly. The control (58) controls the meter actuator (60) and thevalve actuator (59) in first and second modes of operation to dispense the fluidmaterial (55) from the dispensing gun (53) by alternately drawing from the supply of fluid material (51) through the valve assembly into a first one of the chamber portions and forcing the fluid material from a second one of the chamber portions through the valve assembly to the dispensing gun. If the amount of material dispensed is less than the volume of the metering chamber, the control (58) controls the metering actuator (60) and the valve actuator (59) in a third mode of operation to force the fluid material in the metering cylinder (56) from one of the chamber portions into the other one of the chamber portions through the valve assembly (52) without forcing the fluid material from the valve assembly to the dispensing gunthereby resetting the dispensing apparatus.

Cette invention concerne une méthode et un appareil (50) de distribution de matière fluide (55) faisant appel à un pistolet (53) pour l'enrobage d'une pièce (17) et comportant un cylindre doseur (56) à deux compartiments (66, 67) à volume variable, un robinet (52) raccordé à une source d'alimentation (51), au pistolet et aux compartiments du cylindre doseur, ainsi qu'un régulateur de dosage lui-même raccordé au cylindre doseur et à un actionneur de robinet (59). Le régulateur (58) règle le fonctionnement de l'organe doseur (60) et de l'actionneur de robinet (59) selon un premier et un second modes de fonctionnement selon lesquels la matière fluide (55) soutirée de la source d'alimentation (51) est d'abord acheminée dans le premier compartiment du cylindre doseur puis forcée au moyen du robinet à pénétrer dans le second compartiment et le pistolet de distribution lui-même. Si le volume de matière distribuée est inférieur au volume du compartiment de dosage, le régulateur (58) enclenche un troisième mode de fonctionnement de l'organe doseur (60) et de l'actionneur de robinet (59) selon lequel la matière fluide se trouvant dans un des compartiments du cylindre doseur (56) est forcée à pénétrer dans l'autre compartiment sans toutefois pouvoir progresser jusqu'au pistolet, action qui entraîne la remise à zéro de l'appareil de distribution.

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