Patent ID: 6050314
Filing Date: 2000-04-18
Classification: B05B,B05C,H05K,Y10T

Abstract:
An adhesive applying apparatus comprising:a support unit for supporting a circuit board;an adhesive applying nozzle for applying adhesive on an upper surface of the circuit board;an elevation drive unit connected to said adhesive applying nozzle for moving said adhesive applying nozzle in a vertical direction toward and away from a lowermost position, wherein said elevation drive unit can be selectively controlled in order to adjust the lowermost position of said adhesive applying nozzle, wherein said elevation drive unit comprisesa) a cam having two curved cam surfaces, each of said two cam surfaces having a different curvature,b) a reversible motor for rotating said cam,c) a cam follower which moves on the cam surfaces of said cam such that the specific lowermost position of said adhesive applying nozzle is dependent upon which of said two cam surfaces that said cam follower engages in response to rotation of said cam by said reversible motor, andd) a shaft connected to said adhesive applying nozzle and to said cam follower;a purging station having an upper surface for receiving a purging tape;a purging station elevation unit which includes a motor, and a threaded shaft rotatably connected to said motor and in engagement with said purging station, wherein said motor is operable to rotate said threaded shaft which results in up and down movement of said purging station;a transverse drive unit for moving said adhesive applying nozzle, relative to said support unit and said purging station, in a direction which is perpendicular to the vertical direction so as to position said adhesive applying nozzle relative to support unit and said purging station; anda control means operably connected to said elevation drive unit for controlling said elevation drive unit via a command in order to set the lowermost position of said adhesive applying nozzle,wherein said reversible motor of said elevation drive unit is operable in response to the command from said control means resulting in rotation of said cam, which moves said cam follower on the cam surface of said cam so that said shaft is moved downward and said adhesive applying nozzle is moved to a selected lowermost position.