Patent ID: 9108215
Filing Date: 2015-08-18
Classification: B05C,G01F

Abstract:
1. A material dispensing pump comprising: a closed-loop servo-motor having indexed rotational positions; a dispensing controller that generates control signals to control the servo-motor, wherein the servo-motor performs a dispensing operation in response to the control signals; a housing having an opening; a removable cartridge assembly positioned in the opening, the cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity, and a feed mechanism extending through the cavity, the feed mechanism including a cylindrical neck and a feed path, the feed path being substantially sealed from ambient air between the inlet port and the outlet port by a seal positioned about the neck between the neck and the cartridge assembly and a securing device that secures the seal in position about the neck, wherein the seal substantially seals the feed path from ambient air, the closed-loop servo-motor driving the feed mechanism in a first direction of rotation during the dispensing operation and a second direction of rotation opposite the first direction, wherein the movement of the screw in the second direction operates to further place material in the feed path to be presented to the inlet port in suspension.