Browse Prior Art Database

Access Drive Mechanism

IP.com Disclosure Number: IPCOM000074679D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Siegl, LR: AUTHOR

Abstract

A lead screw following device is fabricated from two identical nut halves, which are held by a spring clip around a rotatable lead screw device and a pair of fixed guide rods. By this arrangement, low tolerance, economical fabrication techniques can be employed while minimizing side motion and backlash. The device is particularly useful for a low cost recording head access drive.

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Access Drive Mechanism

A lead screw following device is fabricated from two identical nut halves, which are held by a spring clip around a rotatable lead screw device and a pair of fixed guide rods. By this arrangement, low tolerance, economical fabrication techniques can be employed while minimizing side motion and backlash. The device is particularly useful for a low cost recording head access drive.

By forming two identical slide nut halves 10 and 11 each with half of the thread required to match rotatable lead screw 12, expensive procedures for molding accurate threaded holes are avoided.

Spring clips 14 and 15 are attached to 11 and 10, respectively, to hold 10 and 11 around 12 in compression. Clips 14 and 15 also engage the end faces of 10 and 11 to effect shear forces between 10 and 11 and thus keep 10 and 11 in sliding engagement with fixed retaining bars 17 and 18. Note that a compressive function similar to 14 is provided between 10 and 11 by 15 via an arm of 23 which corresponds to 20 but is not visible. Spring 16 attached to 10 has arms 24 and 25 which press against 11 and remove backlash between 10 and 11. Thus, spring forces in three directions are provided by 14, 15 and
16. Inexpensive centerless ground guide rods 17 and 18 provide lateral alignment by engaging 11 and 10, respectively, thus removing side motion. Wear on the sliding parts will not cause any side motion. If desired, the shear function of 16 can be effected without 16 by adding a spri...