US3733592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split pawl positioning mechanism for a magnetic head
Assignee: Individual
•
Filing: 1971-08-04
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Granted: 1973-05-15
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Expires: 1991-08-04
Abstract
Abstract A magnetic head positioning mechanism of a rack and pawl type wherein the pawl consists of two pawls offset by one half of the tooth pitch from each other thereby allowing a finer positioning of the head. Additionally there is circuitry for controlling the positioning mechanism consisting of a present address register, a new address register and a servo amplifier responsive to the difference in the addresses and the velocity of the positioning member.
Inventors
- 👤 R Applequist
- 👤 L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:06
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356; G; G11; G11B; G11B5/00; G11B5/48; G11B5/4806; G11B5/4826; G11B5/54; G11B5/55; G11B5/5521; G11B5/5552; G11B5/5556; G11B5/58; G11B5/60; H02P; H02P25/00; H02P25/02; H02P25/032; H02P25/034
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
276 words
A drive motor for the linear positioning of a magnetic recording head comprising: a. a permanent magnet; b. a wire-wound coil mounted adjacent to the magnet with said coil and magnet mounted for relative linear motion therebetween when a d.c. electrical current is introduced into the coil; c. a velocity control for regulating direction and velocity of said wire-wound coil with respect to said magnet which further comprises: 1. a present position counter register for determining the position of the coil in relation to the permanent magnet and converting present relative position into an electrical analog; 2. a new-address register creating an electrical analog parametrically equivalent to the electrical analog generated by the present position register and representing new relative position desired for coil and magnet; 3. a difference count decode device connected to said present position register and said new-address register for combining input analogs from the present position register and from the new-address register and generating a resultant electrical output analog representing the difference between the actual relative position of coil to magnet and the new relative position; 4. a positioner velocity tachometer which develops a feedback electrical analog functional to the Relative velocity between coil and magnet; 5. a servo-amplifier connected to the difference count decode, and the positioner velocity tachometer for generating an output signal proportional to the difference between the output analog of said decode device and the electrical analog of said tachometer; and, 6. mechanical locking means connected to said difference count decode device and interconnecting said magnet and coil for locking said magnet and coil against relative movement when said difference count decode device is in a zero condition.
Claim 2
Dependent Claim
276 words
A drive motor for the linear positioning of a magnetic recording head comprising: a. a permanent magnet; b. a wire-wound coil mounted adjacent to the magnet with said coil and magnet mounted for relative linear motion therebetween when a d.c. electrical current is introduced into the coil; c. a velocity control for regulating direction and velocity of said wire-wound coil with respect to said magnet which further comprises: 1. a present position counter register for determining the position of the coil in relation to the permanent magnet and converting present relative position into an electrical analog; 2. a new-address register creating an electrical analog parametrically equivalent to the electrical analog generated by the present position register and representing new relative position desired for coil and magnet; 3. a difference count decode device connected to said present position register and said new-address register for combining input analogs from the present position register and from the new-address register and generating a resultant electrical output analog representing the difference between the actual relative position of coil to magnet and the new relative position; 4. a positioner velocity tachometer which develops a feedback electrical analog functional to the Relative velocity between coil and magnet; 5. a servo-amplifier connected to the difference count decode, and the positioner velocity tachometer for generating an output signal proportional to the difference between the output analog of said decode device and the electrical analog of said tachometer; and, 6. mechanical locking means connected to said difference count decode device and interconnecting said magnet and coil for locking said magnet and coil against relative movement when said difference count decode device is in a zero condition.
Claim 3
Dependent Claim
29 words
a new-address register creating an electrical analog parametrically equivalent to the electrical analog generated by the present position register and representing new relative position desired for coil and magnet;
Claim 4
Dependent Claim
29 words
a new-address register creating an electrical analog parametrically equivalent to the electrical analog generated by the present position register and representing new relative position desired for coil and magnet;
Claim 5
Dependent Claim
192 words
A linear positioning unit having the apparatus of claim 1 in which said locking means comprises: a. a detent rack having a series of teeth of uniform pitch; b. a detent pawl split into two halves both halves mounted on a common pivot axis, each of said halves having teeth of at least one in number of pitch identical to the teeth on said rack, said teeth on one-half of the split detent pawl offset from the teeth on the other half of the split detent pawl in a direction parallel to the length of said rack by one-half of tooth pitch; c. controlled engagement means for pivoting said detent pawl about its pivot axis for engaging the teeth on said halves of the detent pawl with the teeth on said rack and meshing the teeth of one of said halves of the detent pawl with the teeth of said rack, and; d. means connecting said recording head to one of said detent pawl and rack and mounting said detent pawl and rack for relative movement with respect to each other along a direction generally parallel to the length of said rack.
Claim 6
Dependent Claim
187 words
Apparatus for fixing the linear position of a recording head comprising: a. a detent rack having a series of teeth of uniform pitch; b. a detent pawl split into two halves both halves mounted on a common pivot axis, each of said halves having teeth of at least one in number of pitch identical to the teeth on said rack, said teeth on one-half of the split detent pawl offset from the teeth on the other half of the split detent pawl in a direction parallel to the length of said rack by one-half of tooth pitch; c. controlled engagement means for pivoting said detent pawl about its pivot axis for engaging the teeth on said halves of the detent pawl with the teeth on said rack and meshing the teeth of one of said halves of the detent pawl with the teeth of said rack; and d. means connecting said recording head to one of said detent pawl and rack and mounting said detent pawl and rack for relative movement with respect to each other along a direction generally parallel to the length of said rack.
Claim 7
Dependent Claim
187 words
Apparatus for fixing the linear position of a recording head comprising: a. a detent rack having a series of teeth of uniform pitch; b. a detent pawl split into two halves both halves mounted on a common pivot axis, each of said halves having teeth of at least one in number of pitch identical to the teeth on said rack, said teeth on one-half of the split detent pawl offset from the teeth on the other half of the split detent pawl in a direction parallel to the length of said rack by one-half of tooth pitch; c. controlled engagement means for pivoting said detent pawl about its pivot axis for engaging the teeth on said halves of the detent pawl with the teeth on said rack and meshing the teeth of one of said halves of the detent pawl with the teeth of said rack; and d. means connecting said recording head to one of said detent pawl and rack and mounting said detent pawl and rack for relative movement with respect to each other along a direction generally parallel to the length of said rack.
Claim 8
Dependent Claim
53 words
a difference count decode device connected to said present position register and said new-address register for combining input analogs from the present position register and from the new-address register and generating a resultant electrical output analog representing the difference between the actual relative position of coil to magnet and the new relative position;
Claim 9
Dependent Claim
53 words
a difference count decode device connected to said present position register and said new-address register for combining input analogs from the present position register and from the new-address register and generating a resultant electrical output analog representing the difference between the actual relative position of coil to magnet and the new relative position;
Claim 10
Dependent Claim
19 words
a positioner velocity tachometer which develops a feedback electrical analog functional to the Relative velocity between coil and magnet;
Claim 11
Dependent Claim
19 words
a positioner velocity tachometer which develops a feedback electrical analog functional to the Relative velocity between coil and magnet;
Claim 12
Dependent Claim
70 words
The apparatus of claim 3 characterized further by the inclusion of: a. support means mounting said detent pawl with its pivotal axis stationary; b. connecting means connecting said head to said rack for moving said head and rack in unison; and, c. sensing means mounted in fixed position with respect to said pivotal axis adjacent to the path of movement of said teeth of said rack for sensing said teeth.
Claim 13
Dependent Claim
60 words
The apparatus of claim 4 characterized further by the inclusion of dual sensing means in said sensing means positioned apart on odd multiple of one-half the tooth pitch of said rack, and counting means connected to both said dual sensing means for determining the position of said head by counting twice the number of rack teeth passing and sensing means.
Claim 14
Dependent Claim
38 words
a servo-amplifier connected to the difference count decode, and the positioner velocity tachometer for generating an output signal proportional to the difference between the output analog of said decode device and the electrical analog of said tachometer; and,
Claim 15
Dependent Claim
38 words
a servo-amplifier connected to the difference count decode, and the positioner velocity tachometer for generating an output signal proportional to the difference between the output analog of said decode device and the electrical analog of said tachometer; and,
Claim 16
Dependent Claim
36 words
mechanical locking means connected to said difference count decode device and interconnecting said magnet and coil for locking said magnet and coil against relative movement when said difference count decode device is in a zero condition.
Claim 17
Dependent Claim
36 words
mechanical locking means connected to said difference count decode device and interconnecting said magnet and coil for locking said magnet and coil against relative movement when said difference count decode device is in a zero condition.
Claim 18
Dependent Claim
252 words
In a magnetic recording disc drive having a spindle for rotating at least one recording disc about an axis and a magnetic recording head for reading and writing information on concentric tracks on said disc, the improved means for positioning said head at predetermined tracts on a disc which comprises: a. a magnetic member mounted in fixed position with respect to said spindle; b. a wire wound coil movably mounted adjacent to said magnetic member for movement in a direction radially of said axis in response to electrical current in said coil; c. means connecting said magneTic recording head to said coil for moving said head radially of said spindle with said coil; d. a rack connected to said coil for movement therewith and having a series of teeth spaced radially of said spindle and corresponding to different recording tracks for said magnetic recording head; e. releasable locking means mounted in fixed position with respect to said magnetic member and engageable with said rack for locking said magnetic head at the location of each of said recording tracks; f. track counting means mounted in fixed position with respect to said locking means for sensing the teeth on said rack and generating electrical signals when said teeth pass said counting means; and, g. control means interconnecting said coil, said locking means and said track counting means for energizing said coil to move said head toward a predetermined track location and locking said locking means responsive to a predetermined count of said counting means.
Claim 19
Dependent Claim
252 words
In a magnetic recording disc drive having a spindle for rotating at least one recording disc about an axis and a magnetic recording head for reading and writing information on concentric tracks on said disc, the improved means for positioning said head at predetermined tracts on a disc which comprises: a. a magnetic member mounted in fixed position with respect to said spindle; b. a wire wound coil movably mounted adjacent to said magnetic member for movement in a direction radially of said axis in response to electrical current in said coil; c. means connecting said magneTic recording head to said coil for moving said head radially of said spindle with said coil; d. a rack connected to said coil for movement therewith and having a series of teeth spaced radially of said spindle and corresponding to different recording tracks for said magnetic recording head; e. releasable locking means mounted in fixed position with respect to said magnetic member and engageable with said rack for locking said magnetic head at the location of each of said recording tracks; f. track counting means mounted in fixed position with respect to said locking means for sensing the teeth on said rack and generating electrical signals when said teeth pass said counting means; and, g. control means interconnecting said coil, said locking means and said track counting means for energizing said coil to move said head toward a predetermined track location and locking said locking means responsive to a predetermined count of said counting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |