| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a drilling device of a printed circuit board capable of efficiently discharging chips and cooling a drill by hitting a vortical flow of air to the drill concerning through hole work of the printed circuit board. <P>SOLUTION: This drilling device of the printed circuit board installing a bush 4B having a drill through hole 9 in the center on a lower end of a pressure foot 3 free to connect and disconnect and to drill in a state where this bush 4B presses the printed circuit board (work 1)i s constituted by forming a plurality of first gas passages 41 to generate a vortical revolving flow by the air to introduce to the inside of the pressure foot 3 on a side surface of the bush 4B to introduce the outside air of the pressure foot 3 to the inside of the pressure foot 3 when the air inside of the pressure foot 3 is adsorbed and discharged to discharge the chips and forming a plurality of second gas passages 42B to generate the vortical revolving flow by the air reaching a head end part of the drill 5 on the side of the work 1 of the first gas passages 41. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
