Patent ID: 7376486
Filing Date: 2008-05-20
Classification: H05K

Abstract:
1. A board positioning device for positioning a printed board, comprising: a board supplying conveyer portion; a board positioning portion receiving the printed board from the board supplying conveyer portion and positioning the printed board therein; a first motor driving the board supplying conveyer portion; a second motor driving the board positioning portion; a first board detection sensor and a second board detection sensor that is disposed at a lower stream position than the first board detection sensor in a direction of conveying the printed circuit board; a first timer that starts when the board supplying conveyer portion starts conveying the printed board; a second timer and a third timer that start when the first board detection sensor detects the printed board before a timeout of the first timer; a controller to control the first and second motors so that the printed board starts moving, decelerates after a timeout of the second timer and stops at an arbitrary position in the board positioning portion when the second board detection sensor detects the printed board before a timeout of the third timer; a fourth timer; and a recognition device, wherein the controller controls the first and second motors so that the printed board moves from the arbitrary position in a reverse direction until the second board detection sensor stops detecting the printed board and that the fourth timer starts with the start of the reverse moving, the recognition device calculates a distance between the arbitrary position and the second board detection sensor based on a reading of an encoder of the second motor corresponding to the stopping of the detecting the printed board before a timeout of the fourth timer, and the controller controls the first and second motors based on the calculated distance.