Patent US3653241A successfully refreshed from Google Patents.
Patent US3875589A successfully refreshed from Google Patents.
US3875589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular servo track writer with linear positioning
Assignee: Individual
•
Filing: 1974-03-27
•
Granted: 1975-04-01
•
Expires: 1994-03-27
Abstract
Abstract A modular servo track writer machine with linear positioning for recording information on computer disk packs; the machine including a self-contained modular positioner with a screw-detent type mechanism which positioner is adapted for ready removability and replacement in the machine baseplate assembly and which modular positioner is self-aligning relative to the access mechanism; the access mechanism being a self-supporting unit with a carriage overhanging the head supporting tower on the side away from the spindle.
Inventors
- 👤 Roy A Applequist
- 👤 Richard W Rawie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
384 words
In a servo track writer system having at least one rotating disk with a servo information recording surface thereon and a transducer disposed for displacement relative to the disk for writing annular servo tracks on the disk, the combination comprising: a drive shaft defining a first axis therethrough adapted to be rotatably driven about said first axis; a drive means mounted on said drive shaft and being freely rotatable thereon; a clutch plate rotatably carried by said drive shaft and frictionally engaged with said drive means so as to be adapted to continuously rotate said drive means; an angularly movable member including means forming a first precision Thread and having a detent wheel affixed thereto, said detent wheel including an outer surface that defines a diameter which is greater than the diameter of said first thread and having a plurality of detent teeth therearound, said angularly movable member being angularly movable about a second axis that is parallel to said first axis and spaced therefrom a distance so as to be angularly driven by said drive means; a linearly movable member including means forming a second precision thread, said means forming said first thread being engaged with said means forming said second thread, said linearly movable member being linearly movable along said second axis in response to angular movement of said angularly movable member so as to define a linear displacement; a detent pawl including a detent face arranged to selectively engage said outer surface of said detent wheel, said pawl being pivotally movable between a detent position wherein said face selectively engages said outer surface so as to inhibit angular motion of said angularly movable member and a free position wherein said face is out of contact with said detent wheel such that said angularly movable member is angularly driven by said drive means; means for selectively pivoting said detent pawl between said detent position and said free position so as to precisely control the angular position of said angularly movable member and consequently the linear displacement of said linearly movable member; and accessing means adapted to interface with said linearly movable member and adapted to support a transducer, said accessing means being responsive to said linear displacement whereby extremely accurate displacement of said transducer relative to said servo surface may be achieved.
Claim 2
Dependent Claim
384 words
In a servo track writer system having at least one rotating disk with a servo information recording surface thereon and a transducer disposed for displacement relative to the disk for writing annular servo tracks on the disk, the combination comprising: a drive shaft defining a first axis therethrough adapted to be rotatably driven about said first axis; a drive means mounted on said drive shaft and being freely rotatable thereon; a clutch plate rotatably carried by said drive shaft and frictionally engaged with said drive means so as to be adapted to continuously rotate said drive means; an angularly movable member including means forming a first precision Thread and having a detent wheel affixed thereto, said detent wheel including an outer surface that defines a diameter which is greater than the diameter of said first thread and having a plurality of detent teeth therearound, said angularly movable member being angularly movable about a second axis that is parallel to said first axis and spaced therefrom a distance so as to be angularly driven by said drive means; a linearly movable member including means forming a second precision thread, said means forming said first thread being engaged with said means forming said second thread, said linearly movable member being linearly movable along said second axis in response to angular movement of said angularly movable member so as to define a linear displacement; a detent pawl including a detent face arranged to selectively engage said outer surface of said detent wheel, said pawl being pivotally movable between a detent position wherein said face selectively engages said outer surface so as to inhibit angular motion of said angularly movable member and a free position wherein said face is out of contact with said detent wheel such that said angularly movable member is angularly driven by said drive means; means for selectively pivoting said detent pawl between said detent position and said free position so as to precisely control the angular position of said angularly movable member and consequently the linear displacement of said linearly movable member; and accessing means adapted to interface with said linearly movable member and adapted to support a transducer, said accessing means being responsive to said linear displacement whereby extremely accurate displacement of said transducer relative to said servo surface may be achieved.
Claim 3
Dependent Claim
21 words
In a servo track writer system, the combination as recited in claim 1 wherein said drive means comprises a drive gear.
Claim 4
Dependent Claim
49 words
In a servo track writer system, the combination as recited in claim 2 wherein said drive gear includes an outer periphery having a first plurality of teeth therearound, and said angularly movable member includes a second plurality of teeth therearound arranged to mesh with said first plurality of teeth.
Claim 5
Dependent Claim
44 words
In a servo track writer system, the combination as recited in claim 2 wherein said drive gear includes an outer periphery having a first plurality of teeth therearound, said detent wheel arranged such that said first plurality of teeth mesh with said detent teeth.
Claim 6
Dependent Claim
71 words
In a servo track writer system, the combination as recited in claim 1 and further comprising a supporting structure, a baseplate mounted on said supporting structure and including an opening therethrough, means for inhibiting vibrations from being transferred between said supporting structure and said baseplate, and a precision spindle extending through said opening and defining a mechanical interface adapted to receive a disk pack having at least one rotating disk therein.
Claim 7
Dependent Claim
50 words
In a servo track writer system, the combination as recited in claim 5 wherein said accessing means includes stationary guide means mounted on said baseplate and carriage means slidably carried by said guide means so as to be linearly movable therealong, said carriage means being adapted to support said transducer.
Claim 8
Dependent Claim
86 words
In a servo track writer system, the combination as recited in claim 6 including a housing having first and second openings therethrough, said drive shaft, said drive means and said clutch plate being disposed within said first opening, said angularly movable member and said linearly movable member being disposed within said second opening, and a plurality of precision stops arranged in two mutually perpendicular directions between said housing and said guide means to facilitate mounting said housing in a preselected alignment relative to said accessing means.
Claim 9
Dependent Claim
26 words
In a servo track writer system, the combination as recited in claim 5 including means for mechanically linking said linearly movable member to said accessing means.
Claim 10
Dependent Claim
33 words
In a servo track writer system, the combination as recited in claim 1 and further comprising means for preloading said linearly movable member against said angularly movable member with a substantially constant force.
Claim 11
Dependent Claim
78 words
In a servo track writer system, the combination as recited in claim 1 including a housing having first and second openings therethrough, said drive shaft, said drive means and said clutch plate being disposed within said first opening, said angularly movable member and said linearly movable member being disposed within said second opening, oil disposed within said first and second openings to reduce friction between the relatively moving parts, and means for sealing said oil within said openings.
Claim 12
Dependent Claim
54 words
In a servo track writer system, the combination as recited in claim 1 including a first housing, and means defining a pivot point for pivotally mounting said detent pawl to said first housing such that a line perpendicular to said detent face when it is in said detent position passes through said pivot point.
Claim 13
Dependent Claim
77 words
In a servo track writer system, the combination as recited in claim 11 wherein the end of said detent pawl opposite said detent face includes an extension arm and additionally including a plunger, a second housing mounted to said first housing for carrying said means for selectively pivoting, said second housing defining a slot therethrough for receiving said extension arm, and means for normally biasing said plunger such that said detent pawl is in said detent position.
Claim 14
Dependent Claim
67 words
In a servo track writer system, the combination as recited in claim 12 including means for stopping said plunger in a normal bias position, whereby when said means for selectively pivoting is actuated it forces said plunger away from said means for stopping, and thus out of said normal bias position, and against said extension arm, thereby causing said detent pawl to pivot into said free position.
Claim 15
Dependent Claim
50 words
In a servo track writer system, the combination as recited in claim 13 wherein said means for stopping is wedge-shaped and mounted on said housing in alignment with said slot, thereby tending to center said extension arm within said slot and thus mimize its frictional contact with said second housing.
Claim 16
Dependent Claim
31 words
In a servo track writer system, the combination as recited in claim 1 including means disposed on said accessing means for locking said linearly movable member to prevent angular movement thereof.
References Cited (Backward Citations)
US3643242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |