Patent ID: 8661657

Claim:
A plurality of back-up pin devices of different types detachably placed to indicated positions on a back-up plate equipped to a component mounting apparatus to support a board from an under surface thereof, to which components have already been mounted, when other components are to be mounted on an upper surface of the board, the back-up pin device comprising: a base portion detachably placed on the back-up plate; at least one support pin adhered to and erected upright on the base portion in advance and supporting the board by contacting an upper end thereof with the under surface of the board, the number of the support pins being different depending on a type of the back-up pin device; and an identification mark provided on the base portion for identifying the type of the back-up pin device, an indicated back-up pin device being selected by the identification mark among the plurality of back-up pin devices of different types, being picked up and placed on the indicated position on the back-up plate specified based on information about the type of the indicated back-up pin device so as to let the support pins thereof avoid the already mounted components on the under surface of the board.