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Retracting Reciprocating Magnetic Stripe Read Head Drive

IP.com Disclosure Number: IPCOM000050073D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Hampson, RA: AUTHOR [+2]

Abstract

Adjacent parallel cam tracks of different depths coact with a cam follower to extend and retract a magnetic stripe read head as it traverses the cam tracks.

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Retracting Reciprocating Magnetic Stripe Read Head Drive

Adjacent parallel cam tracks of different depths coact with a cam follower to extend and retract a magnetic stripe read head as it traverses the cam tracks.

Fig. 1 shows a read head 11 mounted in slide 13 and carried by carrier 19 for reciprocation across the length of a magnetic stripe by lead screw 15. Spring 17 provides a controlled normal force to be exerted by the read head against the magnetic stripe when in the extended position. The deflection of spring 17 is such that when the head is in the retracted position, spring 17 is fully relaxed and head 11 does not contact the magnetic stripe. Stationary cam 21 is mounted by its ends to lie within an opening in carrier 19. Cam 21 has generally parallel tracks of different depths which are followed by cam follower 23.

Figs. 2, 3, 4, and 5 show the action of the cam follower 23 as it goes through a complete cycle of traversing cam 21.

In Fig. 2, follower 23 at A is nearing the end of its extended reading position travel of track 25 at A, and begins to descend ramp 29 at B. At C, follower 23 has rotated approximately 90 degrees into position to enter track 27.

In Fig. 3, follower 23 begins traversing track 27 at D. At position E, cam follower 23 continues to rotate again approximately 90 degrees to position F, in which position it traverses cam track 27 as shown at G in Fig. 4. At position H of Fig. 4, cam follower 23 has begun to rise following ramp 31 whil...