Browse Prior Art Database

Variable Thickness Magnetic Card Reader

IP.com Disclosure Number: IPCOM000084678D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Decker, DD: AUTHOR [+3]

Abstract

This is a magnetic card reader having parallel displaced capstan axes located at distances slightly less than one card length apart.

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Variable Thickness Magnetic Card Reader

This is a magnetic card reader having parallel displaced capstan axes located at distances slightly less than one card length apart.

Drive capstans 2, 4, 6 are driven by a flat belt 24 and pulley system which includes flywheel 7 for jitter reduction. Pivotable upper member 16 contains three crowned pressure rollers 10, 11, 12, and three position sense switches 26 (only one of which is shown) and is spring 13 loaded to control pressure roller loading. A magnetic read head 14 is mounted on arm 15 and spring 17 loaded into the card path.

As a card, not shown, enters the transport a sense switch, not shown, located at the pressure roller 10/capstan 2 pinch point is activated, and motor 22 is energized in the forward direction to pull the card into the transport. Since the pressure rollers 10, 11, and 12 are mounted on a common member 16, all three are displaced an amount equal to the card thickness. Therefore, the drive pressure applied to the card will be the same throughout the card path. As the card is driven out of the first drive station 10/2 to the second pinch point 11/4, another switch, not shown, turns on the read electronics and the magnetic stripe passes beneath head 14.

When the card reaches the last pressure roller/capstan combination 12/6, the drive transfers to this position and the card is pulled away from read head 14. Switch 26 detects when the card has reached point 12/6.

Sense switches (two not shown and 26)...