| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem of consuming a burr prevention sheet having a same size as a circuit board per each printed circuit board so as to produce a lot of sheet material wastes in manufacturing the printed circuit. SOLUTION: The printed circuit board 1 is continuously drilled by a drill 7, while the belt-shaped burr prevention sheet 3 put on the printed circuit board 1 is intermittently carried at prescribed pitches relative to the drilling position of the printed circuit board 1 by the drill 7. This method can drastically improve the using efficiency of the burr prevention sheet material so as to drastically reduce the sheet material wastes and be expected of the reduction effect of the manufacturing cost.</p> |
