To prevent the burring of a side electrode by providing a drill for cutting the connection part side of a through-hole in a minute distance to partially peel the through-hole, and cutting the connection part by use of a disc-like grinding wheel.
The connection part 33 side of a through-hole 32 is cut in a minute distance by moving a drill with rotation or moving a master printed board to form a cut part 35 where the through-hole 32 is partially cut. According to this, since the cut part 35 is provided, a side electrode 34a is never burred even if the master printed board is cut by use of a rotating disc-like grinding wheel to form a slit 47. The reason is that the through-hole 32 formed on slave printed boards 31a, 31b is peeled on the connection part 33 side by the cut part 35. No burring is caused on the side electrode 34b side by the same reason.
| JP3955577 | WORKING DEVICE HAVING COMMON SUPPORTING ROLL |
| WO/2000/047376 | CUTTING MACHINE FOR PLASTIC FILMS |
AKATSUKA TERUMOTO
KIMURA JUNICHI
OWAKI HARUKI
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