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Stabilizing Head Carriage

IP.com Disclosure Number: IPCOM000047172D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Eide, JF: AUTHOR [+3]

Abstract

Head carriage 10 in Fig. 1 moves along a radial line of a flexible recording disk carrying recording head 12. Due to tolerances in between guide rod 14 and guides 16 and 18, the radial position of head 12 may vary as much as a distance w/2 from its desired radial position. By taking up the tolerance between guide rod 14 and guides 16 and 18, this may be reduced substantially to zero. In Fig. 1, carriage 10 is moved by stepping motor 20 driving band 22. Band 22 is wrapped between driven pulley 24 and idler pulley 26. The band is fastened to the carriage at pin 28. If carriage 10 rides loosely on the guide rods, then pin 28 effectively becomes a pivot point for the carriage, causing it to pivot through an angle 2a.

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Stabilizing Head Carriage

Head carriage 10 in Fig. 1 moves along a radial line of a flexible recording disk carrying recording head 12. Due to tolerances in between guide rod 14 and guides 16 and 18, the radial position of head 12 may vary as much as a distance w/2 from its desired radial position. By taking up the tolerance between guide rod 14 and guides 16 and 18, this may be reduced substantially to zero. In Fig. 1, carriage 10 is moved by stepping motor 20 driving band 22. Band 22 is wrapped between driven pulley 24 and idler pulley 26. The band is fastened to the carriage at pin 28. If carriage 10 rides loosely on the guide rods, then pin 28 effectively becomes a pivot point for the carriage, causing it to pivot through an angle 2a. The angle a is directly proportional to the separation d between guide rod 14 and one of the guides 16 or 18 divided by the distance L between guides 16 and 18 (for example see Fig. 2A). The total radial position error range w is given by the following expression: w = 2R acos From Fig. 2A and the above equation, it is clear that if d is reduced to zero, then a goes to zero and the error w in Fig. 1 goes to zero. Fig. 2B shows a simple means for reducing d to zero. In Fig. 2B, carriage 10 is biased by spring 30 so that guide rod 14 always rides against the outside inner surface of the guides 16 and 18. Spring 30 biases the carriage in this manner by pushing a low friction bushing 32 against the guide rod 14.

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