Patent US4456937A successfully refreshed from Google Patents.
US4456937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head positioning assembly for disc apparatus
Assignee: Seagate Technology LLC
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Filing: 1981-05-14
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Granted: 1984-06-26
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Expires: 2001-05-14
Abstract
Abstract A positioning assembly for magnetic heads in a disc apparatus including a band drive. The drive includes a relatively temperature insensitive band drive pulley which is employed to preload the positioning apparatus to minimize backlash runout and the like.
Inventors
- 👤 Syed H. Iftikar
- 👤 David L. Reeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
In positioning apparatus for positioning magnetic heads relative to a recording medium including a carriage adapted to mount said magnetic heads; carriage guide means for linearly guiding said carriage to position said heads relative to said recording medium; linear drive means including a drive motor, a pulley driven by said drive motor and a flexible band means having wrapped engagement with the pulley and end portions attached to said carriage whereby rotation of the pulley imparts linear movement to said carriage, the improvement comprising a hollow pulley made of material having a low coefficient of thermal expansion.
Claim 2
Dependent Claim
97 words
In positioning apparatus for positioning magnetic heads relative to a recording medium including a carriage adapted to mount said magnetic heads; carriage guide means for linearly guiding said carriage to position said heads relative to said recording medium; linear drive means including a drive motor, a pulley driven by said drive motor and a flexible band means having wrapped engagement with the pulley and end portions attached to said carriage whereby rotation of the pulley imparts linear movement to said carriage, the improvement comprising a hollow pulley made of material having a low coefficient of thermal expansion.
Claim 3
Dependent Claim
68 words
A positioning apparatus as in claim 1 in which said carriage guide means includes a pair of spaced tracks and space bearings adapted to ride on said tracks to provide support for the carriage, an elongated member mounted on the carriage, said pulley including an enlarged portion positioned to engage the resilient member to provide a uniform load to the bearings and to protect the band against wear.
Claim 4
Dependent Claim
21 words
A positioning apparatus as in claim 2 wherein said resilient member is mounted between said tracks to provide said uniform load.
Claim 5
Dependent Claim
84 words
A positioning apparatus as claimed in claim 2 wherein said drive motor comprises a motor shaft, said hollow pulley having a bore extending the length of said pulley, said drive shaft being inserted into a first portion of the bore of said hollow pulley, said flexible band being wrapped about a second portion of said hollow pulley into which said motor drive shaft is now inserted, whereby the effective radius of said pulley is not affected by the thermal expansion of said drive motor.
Claim 6
Dependent Claim
27 words
A positioning apparatus as claimed in claim 2 wherein the material of said hollow pulley has a coefficient of thermal expansion which is low relative to aluminum.
Claim 7
Dependent Claim
117 words
A positioning apparatus for positioning magnetic heads relative to a recording medium including a carriage carrier on bearings adapted to mount said magnetic heads; carriage guide means for guiding said carriage to position said head relative to said recording medium; linear drive means including a drive motor, a pulley driven by said drive motor and a flexible band means having wrapped engagement with the pulley and end portions attached to said carriage whereby rotation of the pulley imparts linear movement to said carriage, the improvement comprising said pulley having an enlarged portion positioned to engage a resilient member mounted on said carriage to provide a uniform load to the bearings and to protect said band against wear.
Claim 8
Dependent Claim
117 words
A positioning apparatus for positioning magnetic heads relative to a recording medium including a carriage carrier on bearings adapted to mount said magnetic heads; carriage guide means for guiding said carriage to position said head relative to said recording medium; linear drive means including a drive motor, a pulley driven by said drive motor and a flexible band means having wrapped engagement with the pulley and end portions attached to said carriage whereby rotation of the pulley imparts linear movement to said carriage, the improvement comprising said pulley having an enlarged portion positioned to engage a resilient member mounted on said carriage to provide a uniform load to the bearings and to protect said band against wear.
Claim 9
Dependent Claim
13 words
A positioning apparatus as claimed in claim 6 wherein said pulley is hollow.
Claim 10
Dependent Claim
27 words
A positioning apparatus as claimed in claim 7 wherein the material of said hollow pulley has a coefficient of thermal expansion which is low relative to aluminum.
Claim 11
Dependent Claim
84 words
A positioning apparatus as claimed in claim 8 wherein said drive motor comprises a motor shaft, said hollow pulley having a bore extending the length of said pulley, said drive shaft being inserted into a first portion of the bore of said hollow pulley, said flexible band being wrapped about a second portion of said hollow pulley into which said motor drive shaft is now inserted, whereby the effective radius of said pulley is not affected by the thermal expansion of said drive motor.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |