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Browse Prior Art Database

Movable Tooling Holes

IP.com Disclosure Number: IPCOM000040882D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Habich, AB: AUTHOR

Abstract

In manufacturing, it is desirable to have the same equipment handle both hard and flexible printed circuit cards. Since a workboard (a carrier for printed circuit boards during processing) is a necessity with flexible cards, it is desirable to use a workboard throughout the manufacturing system.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 55% of the total text.

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Movable Tooling Holes

In manufacturing, it is desirable to have the same equipment handle both hard and flexible printed circuit cards. Since a workboard (a carrier for printed circuit boards during processing) is a necessity with flexible cards, it is desirable to use a workboard throughout the manufacturing system.

In the present process employing a workboard, the work (printed circuit board) is securely attached to the workboard. The workboard has two tooling holes along one edge that are used to register the work to the various assembly machines along the line. The machines are screeners (application of solder paste to the printed circuit) pick and place machines (for placing standard components on the printed circuit), special place machines, labelers, and water jet machines (for cutting the individual boards out of the printed circuit board card).

The relationship between the printed circuit and the various machines that do the assembly is very critical. Precise placement of paste and components is required to assure the circuit desired and the lack of shorting in the circuit.

A buildup of tolerances makes this close relationship difficult, if not impossible using standard techniques.

There are tolerances between the printed circuit and any locating holes or edges on the printed circuit board itself. Additionally, there are tolerances between the holes or edges and mating surfaces or pins on the workboard, and there are tolerances between the surfaces or pi...