US4430782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for burnishing magnetic disks
Assignee: International Business Machines Corp
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Filing: 1982-01-11
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Granted: 1984-02-14
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Expires: 2002-01-11
Abstract
Abstract The burnishing tool has a plurality of holes in the planar surface which engages the flexible magnetic disk. Each hole contains a burnishing blade positioned at 45° to the direction of motion. A manifold connects each hole to a vacuum pump which draws air into the holes causing the flexible magnetic disk to fly against the planar surface. The vacuum also removes the debris from the burnishing tool.
Inventors
- 👤 Randy J. Bornhorst
- 👤 Arlen J. Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; B; B24; B24B; B24B39/00; B24B39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
Apparatus for finishing the surface of a flexible magnetic disk comprising; first drive means for rotating a flexible disk about a first axis perpendicular to the plane of said disk, a manifold rotatable about a second axis parallel to and spaced from said first axis, said manifold having a planar surface perpendicular to said second axis, a plurality of openings in said planar surface a burnishing blade mounted in at least one of said openings with a blade edge positioned substantially coplanar with said manifold planar surface, the ends of said blade edge being spaced from the wall of said openings, means for applying a vacuum to said manifold to draw a flexible disk toward said manifold planar surface, and second drive means for rotating said manifold about said second axis.
Claim 2
Dependent Claim
131 words
Apparatus for finishing the surface of a flexible magnetic disk comprising; first drive means for rotating a flexible disk about a first axis perpendicular to the plane of said disk, a manifold rotatable about a second axis parallel to and spaced from said first axis, said manifold having a planar surface perpendicular to said second axis, a plurality of openings in said planar surface a burnishing blade mounted in at least one of said openings with a blade edge positioned substantially coplanar with said manifold planar surface, the ends of said blade edge being spaced from the wall of said openings, means for applying a vacuum to said manifold to draw a flexible disk toward said manifold planar surface, and second drive means for rotating said manifold about said second axis.
Claim 3
Dependent Claim
35 words
Apparatus according to claim 1 wherein means for controlling the speed of said first and second drive means to cause the rotational speed of said manifold to differ from the rotational speed of said disk.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 2 wherein the rotational speed of said manifold is 1650 RPM±2 RPM and the rotational speed of said disk is 1658 RPM±2 RPM.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 1 wherein the diameter of said planar surface is greater than the radial length of the area to be burnished.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 1 wherein the distance between said first and second axes remains constant during burnishing.
Claim 7
Dependent Claim
15 words
Apparatus according to claim 1 wherein said openings are arranged equidistant from said second axis.
Claim 8
Dependent Claim
21 words
Apparatus according to claim 1 wherein the area of said openings is approximately 33% of the area of said planar surface.
Claim 9
Dependent Claim
20 words
Apparatus according to claim 1 wherein the gauge vacuum within said manifold during operation is 9 inches of mercury (±1).
Claim 10
Dependent Claim
81 words
A process for treating the surface of a flexible magnetic disk comprising the steps of: 1. Rotating the disk at a first speed, 2. Rotating a manifold, having burnishing blades positioned in holes in a planar surface, at a second, different speed, 3. Applying a vacuum to said manifold to cause said disk to fly against said planar surface and engage said burnishing blades, 4. Discharging said vacuum to disengage said disk from said manifold surface when the treatment is complete.
Claim 11
Dependent Claim
81 words
A process for treating the surface of a flexible magnetic disk comprising the steps of: 1. Rotating the disk at a first speed, 2. Rotating a manifold, having burnishing blades positioned in holes in a planar surface, at a second, different speed, 3. Applying a vacuum to said manifold to cause said disk to fly against said planar surface and engage said burnishing blades, 4. Discharging said vacuum to disengage said disk from said manifold surface when the treatment is complete.
Claim 12
Dependent Claim
20 words
A process according to claim 9 wherein step 3 lasts at least 2 seconds and not more than 5 seconds.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |