Browse Prior Art Database

Reciprocating Magnetic Stripe Reader

IP.com Disclosure Number: IPCOM000051017D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Hampston, RA: AUTHOR

Abstract

A bidirectional variable-depth lead screw is used to reciprocatingly drive a magnetic read head across a magnetic stripe, such as the stripe on a credit card. The depth of the lead screw in one direction is greater than the depth in the return direction. The depth of the lead screw is used as a reference to extend and retract the read head as it scans the magnetic stripe and returns to start position.

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Reciprocating Magnetic Stripe Reader

A bidirectional variable-depth lead screw is used to reciprocatingly drive a magnetic read head across a magnetic stripe, such as the stripe on a credit card. The depth of the lead screw in one direction is greater than the depth in the return direction. The depth of the lead screw is used as a reference to extend and retract the read head as it scans the magnetic stripe and returns to start position.

Fig. 1 shows the lead screw, and Fig. 2 shows a cross section of the lead screw emphasizing the different depth of the screw in each direction. Fig.3 is a cross section of the drive mechanism showing lead screw 1 which is driven in a clockwise direction to scan the magnetic track 14 and return the read head. Head carrier 2 rides on the outside diameter of the lead screw 1 and is guided by rails in extrusion 8 by which the entire assembly is mounted into the card reader. Magnetic read head 6 is spring-loaded by spring 9 and slides in head retainer 5. A drive key 3, having an elongated foot for spanning crossing groove 12, s spring-loaded by spring 4 against the bottom surfaces 10 and 12 of he lead screw 1. B As lead screw 1 turns, head carrier 2 is moved parallel to the axis of lead screw 1 by the drive key 3 which is forced to follow slot 10. During the first revolution of lead screw 1, the key 3 rides in the shallowest lead screw groove 10, causing head carrier 2 to be extended and read head 6 to contact the magnectic stripe 14...