| 摘要 |
A retractable registration pin to be used on the tooling plate of a printed wire board drilling machine for alignment of PWB panels on the tooling plate for drilling. In the instant invention, a soft plug which receives a registration pin is mounted on a spline shaft. The bottom of the ball spline shaft is attached to a link which is coupled to a pneumatic cylinder. The pneumatic cylinder is driven by a pneumatic valve which raises and lowers the registration pin on the ball spline assembly. The pneumatic cylinder may either fully retract the registration pin to a position below the surface of the tooling plate, or fully extend the ball spline shaft so that the upper surface of the soft plug holding the registration pin, is parallel to and lies in the same plane as the upper surface of the tooling plate. When the registration pin is in the raised position, work panels may be placed over the registration pin until a suitable number have been prepared for drilling. If the registration pin protrudes above the surface of the upper work panel work piece, a pneumatic valve is opened allowing the pneumatic cylinder to be opened to the atmosphere and the spindle of the machine tool may be used to push down the registration pin to a position that is flush with the surface of the upper work piece, thereby preventing interference with the spindle. When drilling of the panels is completed, the pneumatic valve may be engaged again, to retract the registration pin below the surface of the tooling plate allowing easy removal of the work from the machine.
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