Adhesive dispensing pump control system

An adhesive pump system for automatically changing the flow rate of adhesive being dispensed onto a workpiece in conformance with changes in movement of an automatically controlled adhesive dispensing nozzle used to apply a predetermined pattern of adhesive around the surface of the workpiece;

• said improved adhesive pump system comprising an adhesive dispensing positive displacement rotary pump specially designed for pumping medium to high viscosity adhesive material and having a pump housing defining a pump cavity having at least one inlet port and one outlet port, rotatable gear pump impeller means supported within the pump cavity for physically pumping adhesive supplied thereto through the inlet port to the outlet port at a flow rate dependent upon the rotational speed of the gear pump impeller means, said gear pump impeller means being secured to and rotatable with at least one rotatable pump shaft, shaft bearing means secured within said pump housing for rotatably supporting the pump impeller shaft, sealing means disposed around the shaft intermediate the bearing means and the pump cavity for preventing leakage of the adhesive materials being pumped along the shaft from the pump cavity into the bearings, said pump housing including at least one grease lubricant supply chamber having grease supply passageways interconnecting the chamber to high pressure inlet one-way valve fittings on the exterior of the pump housing for the supply of grease lubricant thereto under pressure, and said pump housing further including interconnecting passageways from the lubricant supply chamber to and around the shaft bearing surfaces to the sealing means for pressurizing the sealing means with grease lubricant for increasing and maintaining the sealing action of the seal relative to the pump shaft at the end thereof adjacent the pump cavity;
• said adhesive dispensing pump supplying adhesive material to a dispensing nozzle mounted on and moved by an automatically controlled dispensing machine over preprogrammed paths of movement for dispensing an adhesive in a predetermined pattern onto the workpiece, said adhesive dispensing pump being driven by a variable speed electric servo drive motor;
• a servo drive electronic motor controller coupled to and controlling the speed of the servo drive motor;
• and a programmable control computer for automatically controlling movement of the adhesive dispensing nozzle in tracing out the adhesive being dispensed in a predetermined pattern, said servo drive electronic motor controller also being controlled by the control computer in conjunction with the movement of the adhesive dispensing nozzle whereby the speed of the adhesive dispensing pump and hence the flow rate of adhesive being dispensed is synchronized with the movement of the adhesive dispensing nozzle.

An improved adhesive pump control system for automatically changing the flow rate of adhesive materials being dispensed onto a workplace in conformance with changes in movement of an automatically controlled adhesive dispensing nozzle used to apply the adhesive materials onto the surface of the workpiece;

• said improved adhesive pump control system comprising a variable speed positive displacement adhesive dispensing rotary pump specially designed for pumping medium to high viscosity adhesive materials and supplying the same to a dispensing nozzle mounted on and moved by an automatically controlled dispensing machine over a preprogrammed path of movement for dispensing the adhesive materials in a predetermined pattern onto the workpiece, said adhesive dispensing pump being driven by a variable speed electric servo drive motor, a servo drive electronic motor controller coupled to and controlling the speed of the servo drive motor, said automatically controlled dispensing machine having a programmable control computer for controlling movement and operation of the adhesive dispensing nozzle while dispensing the adhesive material in a predetermined pattern onto the workpiece, and said servo drive electronic motor controller being controlled by the control computer in conjunction with the movement of the adhesive dispensing nozzle whereby the speed of the adhesive dispensing pump and hence the flow rate of the adhesive being dispensed is synchronized with the movement of the adhesive dispensing nozzle.