Patent ID: 8649894

Claim:
A method for controlling a circuit board position during an assembly of electronic components in an electronic component mounting production line formed by a plurality of electronic component mounting machines arranged in series, each including a board transfer device which transfers a circuit board along a transfer pathway by a conveyer belt and stops the conveyer belt to stop the circuit board thereon at a mounting position based on a detection signal which is outputted from a board sensor provided at a reference position on the transfer pathway, a component supply device for supplying various kinds of electronic components which are to be mounted on the circuit board and a component mounting device for picking the electronic component from the component supply device and mounting the picked electronic component on the circuit board stopped at the mounting position, by moving in the transfer direction and in a direction perpendicular thereto, and in one of the plurality of electronic component mounting machines, an electronic component being mounted on the circuit board by the component mounting device in such a manner that a part of the electronic component is extended beyond an end portion of the circuit board, the method being for controlling a circuit board position in an electronic component mounting machine subsequent to the one of the electronic component mounting machines and comprising: a calculation step for calculating an extended length of the part of the component, which extends from the end portion of the circuit board in the transfer direction, based on coordinates designated on the circuit board of the end portion thereof and of the electronic component mounted thereon and a size of the electronic component; and a correcting and stopping step for stopping the circuit board at the mounting position, wherein the board transfer device transfers the circuit board by a corrected transfer distance which is calculated by adding the extended length to a distance between the reference position and the mounting position after the board sensor outputs the detection signal when the board sensor detects an end portion of the electronic component.