Patent ID: 6283695
Filing Date: 2001-09-04
Classification: G01R,H01L,Y10S

Abstract:
A tray conveying apparatus which has a conveying line that conveys trays on which a plurality of semiconductor parts are carried, said tray conveying apparatus comprising:a main staton which is disposed in a movable manner at a prescribed position on said conveying line for conveying trays;a sub-station which is disposed in a movable manner at a position adjacent to said prescribed position on said conveying line, said sub-station for carrying satisfactory-part replenishment trays;a station exchanging means which exchanges stations positioned at said prescribed position on said conveying line;a part transfer means which removes deficient parts from a tray that is fed onto and positioned at the main station and replenishes satisfactory parts in said tray from said satisfactory-part replenishment tray when said main station is positioned at said prescribed position on said conveying line; anda control means which controls operation of said tray conveying apparatus, and whereinsaid control means comprises:a means for positioning said sub-station at said prescribed position on said conveys line instead of said main station;a means for preparing, as said satisfactory-part replenishment tray, a tray with only satisfactory parts thereon on said sub-station positioned at said prescribed position on said conveying line; anda means for positioning said main station at said prescribed position on said conveying line instead of said sub-station, and for positioning said sub-station in said adjacent position, after said tray with only satisfactory parts thereon has been prepared.