Browse Prior Art Database

Card Guide for ID Card Reader

IP.com Disclosure Number: IPCOM000042193D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Farynyk, RJ: AUTHOR

Abstract

A combined registration and card flattening function is provided by a spring-loaded inverted "L" shaped guide rail. As shown in Fig. 1, the guide rail 11 includes curved portion 13 which assists in guiding a warped ID card into the space between registration surface 17 and under the tip 15 of rail 11. Rail 11, being loosely constrained by shoulder screws 19, is yet free to move and compress springs 21 as the warped card enters the card transport. Thereafter, the restoring spring force tends to push the card toward registration surface 17 and downward toward the transport base so as to present the card in good flat condition to the magnetic read head for reading or writing.

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Card Guide for ID Card Reader

A combined registration and card flattening function is provided by a spring- loaded inverted "L" shaped guide rail. As shown in Fig. 1, the guide rail 11 includes curved portion 13 which assists in guiding a warped ID card into the space between registration surface 17 and under the tip 15 of rail 11. Rail 11, being loosely constrained by shoulder screws 19, is yet free to move and compress springs 21 as the warped card enters the card transport. Thereafter, the restoring spring force tends to push the card toward registration surface 17 and downward toward the transport base so as to present the card in good flat condition to the magnetic read head for reading or writing. By the proper selection of the distance between the two shoulder screws 19 relative to the distance between the points of application of forces B and C, a smooth pivoting of rail 11 about the point of application of force B will be obtained when the warped ID card is inserted. As shown in Fig. 2, the ID card is partially flattened by flattening force D, generated because rail 11 is restrained by shoulder screws 19 represented by reaction force E. Flattening force D induces card forces V1, V2 and card warping moment M. This configuration is unstable because there is an unbalanced moment about the point where force B against the card, as shown in Fig. 3, causing rail 11 to rotate counterclockwise. When rail 11 applies registration force against the card, as shown in...