Patent ID: 8453567

Claim:
A position matching method adapted for a screen printer operable to superimpose a board held on a print stage on a mask sheet to print paste onto the board via the sheet, comprising: acquiring mask position information and board position information through recognition of images of the mask sheet and the board to perform position matching between the mask sheet and the board according to the board position information and the mask position information before the superimposing operation; and pre-setting a time required for processing a plurality of boards or a number of a plurality of boards to be processed as a mark recognition re-execution condition for acquiring the mask position information; wherein: the board position information and the mask position information are acquired when a first board is held on the print stage, the board position information is further acquired when a second and succeeding boards are held on the print stage, the mask position information is acquired when the mark recognition re-execution condition is satisfied—while boards of the same type are continuously produced, and the position matching is performed according to latest mask position information for the next superimposing operation.