Cutting – Processes
Patent
1982-02-25
1984-08-07
Yost, Frank T.
Cutting
Processes
83399, 834092, 83412, 83418, 83422, 834351, 83445, 83478, 83925R, 83DIG1, 192131R, 269 73, 269221, 269254CS, B26D 100
Patent
active
044636369
ABSTRACT:
The trimming apparatus and fixture for holding a PC board prior to and during trimming of an upper surface of the PC board utilizes a trimming blade rotated by a variable speed motor. This apparatus includes X and Y motion mechanism moved by hand grips that are spaced apart and cooperate with push button switches providing a safety control circuit. The X and Y motion mechanism employs linear ball bushings mounted and movable on hardened steel shafts. Removable holding fixtures are employed to hold and retain the PC boards during trimming. One holding fixture is used for PC boards that are not warped and not likely to warp. This fixture holds the PC board on three sides and a quick acting cam clamp is actuated to retain and release a PC board. Another fixture is adapted to hold and retain a PC board that is warped or likely to warp. Vacuum is used with a plurality of standoffs to establish the desired holding plane of this PC board. A quick opening aperture is uncovered to release both negative pressure and the PC board after trimming. A third fixture employs a top plate which is positioned by dowells. On this fixture and in this plate is formed a plurality of receiving openings for PC boards of small and/or irregular size. Vacuum is also employed as well as standoffs. The interior chamber of this fixture is provided with a quick opening lever plate that is manipulated to uncover an aperture and bring the interior of the fixture to atmospheric pressure.
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Heller Martin G.
Pecha Edward
Rudder Joel
Smith Douglas
Heller Martin G.
Phan Hien H.
Roberts Ralph R.
Yost Frank T.
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