Integrated reel hub and motor shaft assembly for tape drives

Patent metadata

Field	Value
Publication number	US-9824714-B2
Application number	US-201514739129-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Mar 20, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

An integrated reel hub and motor shaft assembly for a tape drive that limits axial and radial run-out of tape (e.g., magnetic, optical) relative to a read/write head assembly and the various errors (e.g., loading, tension, reading, writing, and the like) associated therewith. In one arrangement, a reel hub of a reel assembly is directly molded (e.g., via an injection molding process) onto and around an end of a drive or motor shaft of a drive assembly. As a result, a more consistent head to tape interface, greater tape tracking performance, increased track density, and the like may be achieved.

First claim

What is claimed is:

1. An apparatus for a tape drive, comprising:
a motor shaft having first and second ends and a rotational axis extending between the first and second ends, wherein the motor shaft is adapted to be rotated about the rotational axis by a motor; and
a reel hub having an outer circumferential surface, a central portion, and a rotational axis that is collinear with the rotational axis of the motor shaft and that passes through the central portion, wherein the outer circumferential surface is adapted to receive a tape pack thereon, and wherein the central portion of the reel hub comprises an inner surface that is in direct and rigid contact with the first end of the motor shaft, and wherein the inner surface extends across the rotational axis of the motor shaft.

2. The apparatus of claim 1 , further comprising:
a rotor comprising a central aperture and a rotational axis passing through the central aperture, wherein the motor shaft is non-rotatably secured to the rotor via the central aperture, wherein the rotational axes of the rotor, motor shaft and reel hub are all collinear, and wherein rotation of the rotor via a corresponding stator assembly induces a corresponding rotation of the reel hub via the motor shaft.

3. The apparatus of claim 1 , wherein the motor shaft comprises an outer circumferential surface extending between the first and second ends, and wherein the central portion of the reel hub is molded onto at least a portion of the outer circumferential surface of the motor shaft.

4. The apparatus of claim 3 , wherein the inner surface of the central portion of the reel hub that is in direct and rigid contact with the first end of the motor shaft is disposed on a base wall of the central portion, and wherein the central portion of the reel hub includes a circumferential wall that is molded onto the portion of the outer circumferential surface of the motor shaft.

5. The apparatus of claim 4 , wherein the circumferential wall of the central portion is perpendicular to the base wall of the central portion.

6. The apparatus of claim 5 , wherein the apparatus is free of gaps between the base wall of the central portion and the first end of the motor shaft.

7. The apparatus of claim 6 , wherein the apparatus is free of gaps between the circumferential wall of the central portion and the outer circumferential surface of the motor shaft.

8. The apparatus of claim 4 , wherein the reel hub further includes a central plate interconnecting the circumferential wall of the central portion to the outer circumferential surface of the reel hub.

9. The apparatus of claim 8 , wherein the central plate is perpendicular to the circumferential wall of the central portion and the outer circumferential surface of the reel hub.

10. The apparatus of claim 8 , wherein the central plate is perpendicular to the rotational axis of the reel hub.

11. The apparatus of claim 8 , wherein the circumferential wall of the central portion is disposed above and below the central plate.

12. The apparatus of claim 1 , wherein the apparatus is free of gaps between the central portion of the reel hub and the motor shaft.

13. The apparatus of claim 1 , wherein the central portion of the reel hub is directly molded onto the first end of the motor shaft to provide the direct and rigid contact.

14. An apparatus for a tape drive, comprising:
a motor shaft having first and second ends and a rotational axis extending between the first and second ends, wherein the motor shaft is adapted to be rotated about the rotational axis by a motor;
a reel hub having an outer circumferential surface, a central portion, and a rotational axis that is collinear with the rotational axis of the motor shaft and that passes through the central portion, wherein the outer circumferential surface is adapted to receive a tape pack thereon, and wherein the central portion of the reel hub comprises an inner surface that is in direct and rigid contact with the first end of the motor shaft; and
a rotor comprising a central aperture and a rotational axis passing through the central aperture, wherein the motor shaft is non-rotatably secured to the rotor via the central aperture, wherein the rotational axes of the rotor, motor shaft and reel hub are all collinear, wherein rotation of the rotor via a corresponding stator assembly induces a corresponding rotation of the reel hub via the motor shaft, and wherein the apparatus is free of fasteners extending between the reel hub and the rotor.

15. An apparatus for a tape drive, comprising:
a motor shaft having first and second ends and a rotational axis extending between the first and second ends, wherein the motor shaft is adapted to be rotated about the rotational axis by a motor; and
a reel hub having an outer circumferential surface, a central portion, and a rotational axis that is collinear with the rotational axis of the motor shaft and that passes through the central portion, wherein the outer circumferential surface is adapted to receive a tape pack thereon, and wherein the central portion of the reel hub comprises an inner surface that is in direct and rigid contact with the first end of the motor shaft, wherein the reel hub further comprises first and second opposed laterally opposed sides, and wherein the apparatus further comprises:
a first flange member secured to the first opposed side of the reel hub; and
a second flange member secured to the second opposed side of the reel hub, wherein the first and second flange members are adapted to contain the tape pack therebetween.

Assignees

• Oracle Int Corp

Inventors

• Vanderheyden William

Classifications

• G11B23/113

  Apparatus or processes specially adapted for the manufacture of magazines or cassettes {, e.g. initial loading into container (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B21, B29, B65)} · CPC title

• G11B23/037

  Single reels or spools · CPC title

• G11B15/32 Primary

  through the reels or cores on to which the record carrier is wound · CPC title

• B29C45/14426

  Coating the end of wire-like or rod-like or cable-like or blade-like or belt-like articles · CPC title

• B29L2031/75

  Shafts · CPC title