Browse Prior Art Database

Ball Cone Hub/Clutch for a Small Form Factor Tape Drive

IP.com Disclosure Number: IPCOM000110481D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 65K

Publishing Venue

IBM

Related People

Albrecht, TR: AUTHOR [+7]

Abstract

This invention describes a novel means of providing the control of motion to a cartridge type of tape device. The cartridge contains two rotatable hubs containing magnetic recording tapes (not shown). These reels of tape are wound around a bearing surface and a centrally located magnetic head. The hub/clutch connects the motor and tape reel. The motor provides rotary motion to the hub via a hollow shaft. This assembly is known as the ball-cone hollow shaft clutch.

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This is the abbreviated version, containing approximately 61% of the total text.

Ball Cone Hub/Clutch for a Small Form Factor Tape Drive

      This invention describes a novel means of providing the control
of motion to a cartridge type of tape device.  The cartridge contains
two rotatable hubs containing magnetic recording tapes (not shown).
These reels of tape are wound around a bearing surface and a
centrally located magnetic head.  The hub/clutch connects the motor
and tape reel.  The motor provides rotary motion to the hub via a
hollow shaft.  This assembly is known as the ball-cone hollow shaft
clutch.

      The ball-cone clutch contains the following key components
shown in Figure 1:
      1.   Ball - provides a means of centering in the rotational
mode for the hub.  The hub has a matching cone.  In combination, the
ball-cone provides the necessary means of centering, thereby
guaranteeing very small velocity variation.  The ball-cone structure
also provides convenient clutch insertion and retrieval from the hub.
The centering scheme will not be sensitive to wear. In addition, the
ball is sliding on the inner diameter shaft, where it derives the
centering. The slip-fit no-shake sliding provides compliance to the
ball-cone structure and wobble plate.  The ball structure is made of
aluminum bronze or plastic or other dissimilar material from its
mating/sliding stainless steel shaft.
      2.   Inner spring - the inner spring is the key element
providing compliance to the ball to the tune of about 1 newton of
force.
  ...