Patent US3715523A successfully refreshed from Google Patents.
US3715523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positioning mechanism for magnetic head
Assignee: Bull SAS
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Filing: 1971-06-25
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Granted: 1973-02-06
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Expires: 1991-06-25
Abstract
Abstract A device for controlling the positioning of heads for magnetic discs between non-operative retracted positions and operating positions proximate a surface of the disc wherein a simple compact mechanism selectively moves and locks the heads in their operating position when they reach a reference position opposite the disc or continues the heads in their retracted position for maintenance purposes.
Inventors
- 👤 H Rousseau
- 👤 L Prieur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
223 words
A control device for at least one magnetic head providing for moving such head in a direction substantially perpendicular to the surface of an information bearing medium having a plurality of tracks, between a retracted position relatively distant from said surFace, and an operating position proximate to said surface, said device being at least in part mounted on a carriage supporting said head, and said carriage being translatable toward and away from said medium along a position parallel to the plane of said medium surface, said control device comprising; a rocking arm pivotably mounted on said carriage and having said magnetic head disposed on one end thereof, a shaft rotatably mounted on said carriage and having at least one cam, attached thereto, said cam being located for engagement with the opposite end of said arm, to pivot said arm and move said head in said perpendicular direction on rotation thereof means affixed to said shaft and extending therefrom for turning said shaft when moved about said shaft axis, and stationary means mounted on means other than said carriage and aligned with said shaft turning means for engaging and controlling said shaft turning means, to thereby cause rotation of said shaft and rotation of said cam to move said arm and magnetic head toward said medium, from said retracted position to said operating position.
Claim 2
Dependent Claim
223 words
A control device for at least one magnetic head providing for moving such head in a direction substantially perpendicular to the surface of an information bearing medium having a plurality of tracks, between a retracted position relatively distant from said surFace, and an operating position proximate to said surface, said device being at least in part mounted on a carriage supporting said head, and said carriage being translatable toward and away from said medium along a position parallel to the plane of said medium surface, said control device comprising; a rocking arm pivotably mounted on said carriage and having said magnetic head disposed on one end thereof, a shaft rotatably mounted on said carriage and having at least one cam, attached thereto, said cam being located for engagement with the opposite end of said arm, to pivot said arm and move said head in said perpendicular direction on rotation thereof means affixed to said shaft and extending therefrom for turning said shaft when moved about said shaft axis, and stationary means mounted on means other than said carriage and aligned with said shaft turning means for engaging and controlling said shaft turning means, to thereby cause rotation of said shaft and rotation of said cam to move said arm and magnetic head toward said medium, from said retracted position to said operating position.
Claim 3
Dependent Claim
223 words
A control device for at least one magnetic head providing for moving such head in a direction substantially perpendicular to the surface of an information bearing medium having a plurality of tracks, between a retracted position relatively distant from said surFace, and an operating position proximate to said surface, said device being at least in part mounted on a carriage supporting said head, and said carriage being translatable toward and away from said medium along a position parallel to the plane of said medium surface, said control device comprising; a rocking arm pivotably mounted on said carriage and having said magnetic head disposed on one end thereof, a shaft rotatably mounted on said carriage and having at least one cam, attached thereto, said cam being located for engagement with the opposite end of said arm, to pivot said arm and move said head in said perpendicular direction on rotation thereof means affixed to said shaft and extending therefrom for turning said shaft when moved about said shaft axis, and stationary means mounted on means other than said carriage and aligned with said shaft turning means for engaging and controlling said shaft turning means, to thereby cause rotation of said shaft and rotation of said cam to move said arm and magnetic head toward said medium, from said retracted position to said operating position.
Claim 4
Dependent Claim
223 words
A control device for at least one magnetic head providing for moving such head in a direction substantially perpendicular to the surface of an information bearing medium having a plurality of tracks, between a retracted position relatively distant from said surFace, and an operating position proximate to said surface, said device being at least in part mounted on a carriage supporting said head, and said carriage being translatable toward and away from said medium along a position parallel to the plane of said medium surface, said control device comprising; a rocking arm pivotably mounted on said carriage and having said magnetic head disposed on one end thereof, a shaft rotatably mounted on said carriage and having at least one cam, attached thereto, said cam being located for engagement with the opposite end of said arm, to pivot said arm and move said head in said perpendicular direction on rotation thereof means affixed to said shaft and extending therefrom for turning said shaft when moved about said shaft axis, and stationary means mounted on means other than said carriage and aligned with said shaft turning means for engaging and controlling said shaft turning means, to thereby cause rotation of said shaft and rotation of said cam to move said arm and magnetic head toward said medium, from said retracted position to said operating position.
Claim 5
Dependent Claim
78 words
The control device of claim 1, wherein said shaft is substantially perpendicular to the direction of translation of said carriage, wherein said cam is disc-shaped and is substantially perpendicular to said shaft, wherein said one end of said rocking arm is urged against one face of said cam, wherein said rocking arm pivots on an axle orthogonal to said shaft, and wherein the longitudinal axis of said arm is substantially parallel to the translational direction of said carriage.
Claim 6
Dependent Claim
21 words
The control device of claim 2, wherein said rocking arm is urged against said one cam face by an adjustable stop.
Claim 7
Dependent Claim
71 words
The control device of claim 1, wherein said shaft turning means is a lever and further comprising a latching mechanism, and wherein said stationary engaging means comprise a retractable stop for cooperating with said lever affixed to said shaft during translation of said carriage toward said medium for turning said shaft to a position at which said latching mechanism latches said shaft to maintain said magnetic head in its operating position;
Claim 8
Dependent Claim
84 words
The control device of claim 4 wherein said latching mechanism comprises a disc mounted on said shaft and having a notch therein, said disc being concentric with said shaft, and a catch for engaging in said notch and resiliently urged against said disc, and wherein a spring is connected to said shaft, said spring biasing said shaft in a rotational direction to resist said shaft rotating in the direction corresponding to the movement of said head from its retracted position to its operating position.
Claim 9
Dependent Claim
29 words
The control device of claim 5, further comprising an actuating means for said catch formed of an armature attracted by an electromagnet against the action of said spring means.
Claim 10
Dependent Claim
92 words
The control device of claim 1 further comprising a latching mechanism, and wherein said stationary engaging means controlling the rotation of said shaft are disposed at a fixed station corresponding to a position of said carriage at which said head is above a predetermined track of said information bearing medium said engaging means comprising a movable element for contacting said means for turning said shaft when said carriage is halted in said position for turning said shaft to a position at which said latching mechanism maintains said head in its operating position.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |