Browse Prior Art Database

Card Reader Split Rotor

IP.com Disclosure Number: IPCOM000098601D
Original Publication Date: 1959-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Fury, AM: AUTHOR

Abstract

A punched card 6 has 80 columns. A rotor 5 of a card reader has 4 sets of brushes 1-4 spaced 90o apart about the rotor 5 and equispaced in relation to the axis of rotation of the rotor 5. Each set of brushes has 20 reading brushes. As the rotor rotates it sequentially reads 20 columns at a time; set of brushes 1 reading columns 1-20 at one time, brush set 2 reading columns 20-40 after the rotor 5 has rotated 90 degrees, brushes 3 reading columns 40-60 after the rotor has rotated 180 degrees and brushes 4 reading columns 60-80 after the rotor has rotated 270 degrees.

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Card Reader Split Rotor

A punched card 6 has 80 columns. A rotor 5 of a card reader has 4 sets of brushes 1-4 spaced 90o apart about the rotor 5 and equispaced in relation to the axis of rotation of the rotor 5. Each set of brushes has 20 reading brushes.

As the rotor rotates it sequentially reads 20 columns at a time; set of brushes 1 reading columns 1-20 at one time, brush set 2 reading columns 20-40 after the rotor 5 has rotated 90 degrees, brushes 3 reading columns 40-60 after the rotor has rotated 180 degrees and brushes 4 reading columns 60-80 after the rotor has rotated 270 degrees.

When all 80 brushes read all 80 columns at one time it is possible to have one word composed of 80 bits. In many data processing applications it is desirable to have a larger number of words composed of fewer bits on each card. This is accomplished by selecting the desired number of bits, e. g., 20 bits, and placing sets of reading brushes about the rotor so as to read the bits sequentially.

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