| 摘要 |
<p>In a process for producing calculator printed circuit boards, a pallet consisting of a plurality of printed circuit boards are interconnected by snapaway perforated edges at the adjacent side of the boards, so that the pallet consisting of plural boards is processible as a whole. Electrical elements or components have their terminals received through openings in the printed circuit board, which insertion is by machine utilizing a pantographic locating principle. Components are also assembled on the board by hand insertion. After inserting selected electrical components at the desired locations, and masking other locations, the electrical connections are then treated by fountain soldering to form electrical connections between the leads and the printed circuit. The soldering occurs to the pallet as a whole. The individual boards are then snapped apart and the board has enough dimensional stability so that it is rigidly clamped on a fixture and passed over a routing blade at a predetermined slight clearance therefrom so that all of the excess lead sections are trimmed from the subsurface of the printed circuit substrate. Further electrical devices can then be added and soldered in place and the printing circuit board together with its electrical components can then be positioned within a container for a computer application. The described process incorporates minimal handling and incorporates high speed machine assembly techniques wherein multiple operations occur simultaneously or repetitively at high speed.</p> |
