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Drilled circuit panels can be ejected from a vacuum chuck without damage by employing air-operated pistons to lift the panel from locating pins.
English (United States)
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Drilled circuit panels can be ejected from a vacuum chuck without damage by
employing air-operated pistons to lift the panel from locating pins.
Referring to the figure, circuit panel 1 is positioned by one or more locating
pins 2 during drilling on a vacuum chuck 3. When the panel 1 is to be removed,
air under pressure is supplied to manifold 4 and along channel 5 in chuck 3
above bed 6 to raise piston 7 having O-ring seal 8. Piston rod 9 rises to lift panel
1 to the position shown in phantom 1' and the piston 7 compresses spring 10
against upper plate 11. After the panel 1 has been lifted from chuck 3, air
pressure is relieved through a valve (not shown) and spring 10 returns piston 7 to
its seated position with the aid of bleed vent 12 in plate 11.
This piston arrangement requires minimum height H and uses a side air
manifold 4 so that no air openings in bed 6 are required.