Browse Prior Art Database

Automatic Track Stepping

IP.com Disclosure Number: IPCOM000081272D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Childress, LK: AUTHOR [+4]

Abstract

A manual, magnetic tape head track stepping apparatus requiring both axial and angular movement of a track selector knob for track stepping is converted to an automatic track stepping apparatus, by the addition of a single solenoid and a ratchet gear and pawl linkage to the manual apparatus.

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Automatic Track Stepping

A manual, magnetic tape head track stepping apparatus requiring both axial and angular movement of a track selector knob for track stepping is converted to an automatic track stepping apparatus, by the addition of a single solenoid and a ratchet gear and pawl linkage to the manual apparatus.

In Figs. 1 (top view) and 2 (side view), for manual operator movement of magnetic tape head carrier 21 the operator depresses knob 20, causing downward movement of knob 20 and shaft 7 that is fixedly attached to knob 20. Flange 23 that is fixedly attached to shaft 7 engages the left end of yoke 13, causing counterclockwise rotation of yoke 13 about pivot 14, against the clockwise biasing force of spring 19. Counterclockwise rotation of yoke 13 disengages toothed rack 15 from tooth 16 of carrier 21. Because knob 20 is depressed, teeth 17 around the outer periphery of knob 20 are disengaged from tooth 18 allowing rotation of knob 20. Rotation of knob 20 and shaft 7 provides movement of carrier 21 in a direction into and out of the drawing plane by a cable and pulley coupling, not shown.

Upon the operator's release of knob 20, spring 19 provides clockwise rotation of yoke 13 allowing head carrier 21 to be locked positively into position by the engagement of rack 15 and tooth 16. This clockwise rotation of yoke 13 moves flange 23, shaft 7, and knob 20 upward, providing locking engagement of teeth 17 and 18 to prevent further rotation of knob 20.

Solenoid 1 provides the necessary input motion to accomplish automatic movement of head carrier 21 one track at a time. Solenoid plunger 2 is connected to yoke crank 3 through connecting link 4. Pawl crank 5 is freely rotatable about the hub of ratchet ge...