| 摘要 |
1. Centering and drilling jig, (event device) being composed of a retractable drill bushing (8) which can be placed under the drill of a drilling machine, a drill to which the drill bushing (8) can serve as a guide, this drill being lowered through the drill bushing to carry out the centering of a work piece to be drilled, characterized concerning the automatic manner to position and retract the drill bushing (8) by means of a pneumatic cylinder (4, 5) which supports the drill bushing and which is controlled by a control device (15, 16) which can be actuated by the feeding lever of a drilling machine. |
