Browse Prior Art Database

Card Reading Plate

IP.com Disclosure Number: IPCOM000098889D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Lorenz, EJ: AUTHOR

Abstract

In order to sense the perforations of a record card at rest, a small co ntact area must be provided under each index point of the card so that sensing brushes, extending through such perforations, may complete separate electrical circuits. In the case of 80 column IBM cards, 12 x 80, or 960 such contact areas must be provided with the usual close spacing and each area must have a separate extending wire.

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Card Reading Plate

In order to sense the perforations of a record card at rest, a small co ntact area must be provided under each index point of the card so that sensing brushes, extending through such perforations, may complete separate electrical circuits. In the case of 80 column IBM cards, 12 x 80, or 960 such contact areas must be provided with the usual close spacing and each area must have a separate extending wire.

The present method of forming such a static sensing plate (E) comprises the steps of forming the block with rows and columns of recesses, inserting a wire in each recess and bending its tip to lie flat, filling the recesses with conductive material, grinding off the top excess, and plating the separate lands to form hardened sensing spots.

With regard to the steps specifically:

1. A base block of plastic is molded or fabricated with 960

rectangular recesses in a top face and with shouldered holes

extending downwardly.

2. A wire is inserted upwardly in each of said holes and the

wire tip is bent over to lie in the recess. (A)

3. A conductive mastic (80% silver, 20% Epoxy resin) is

doctor-bladed onto the top face and into the recesses to

cover the wire tips and fill the recesses.

4. The block is cured for 1 hour at 180 degrees F.

5. The top face is ground flush. (C)

6. The top faces of the recess fillings are electroplated

extending wires as cathode lead lines. (D)

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