# US 4,400,750 A · Spring loading arrangement in a magnetic read/write head carriage assembly for a floppy disk drive

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- Number: US 4,400,750 A
- Document ID: US4400750A
- Status: Granted
- Kind: A
- Application number: 06/305,591
- Filed: 1981-09-25
- Granted: 1983-08-23
- Earliest claimed: 1981-09-25
- Assignees: Forestlane Co., Ltd.
- Inventors: Jan G. Krane
- Web page: https://patentgrep.com/patent/US4400750A

## CPC

- G11B 5/58: with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following {(spacing means incorporated in the head structure G11B5/187, G11B5/255, G11B5/3106)}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A magnetic read/write head carriage assembly for a floppy disk drive is disclosed for use with double sided floppy disks which permits the head tracking force to be easily and accurately adjusted. The head carriage assembly comprises a coil spring, having a central coil portion and first and second ends, which is mounted in a position between the base and the head support arm of the carriage assembly with the first end coupled to the base and the second end coupled to the support arm. An adjusting screw is mounted on the base adjacent to the first end of the coil spring for adjusting the position of this end, thereby adjusting the biasing force applied by the spring to the support arm.

## Claims

### Claim 1

A magnetic read/write head carriage assembly for a data storage device fow use with a flexible, rotatable magnetic recording disk, said carriage assembly having a base and being movable in a radial direction relative to the recording disk, said carriage assembly comprising, in combination:
(a) a first magnetic head mounted on said base;
(b) a head support arm having first and second ends, said support arm being pivotally mounted at said first end thereof with respect to said base such that said second end thereof is movable toward and away from said first magnetic head;
(c) a second magnetic head mounted on said support arm at the second end thereof;
(d) spring means, having first and second ends, for biasing said second end of said support arm, and thereby said second magnetic head, toward said first magnetic head, said spring means being mounted in a position between said base and said support arm with said first end thereof being coupled to said base and said second end thereof being coupled to said support arm;
(e) an adjustment screw mounted in said base adjacent said first end of said spring means for adjusting the position of said first end of said spring means and thereby the biasing force applied to said support arm.

### Claim 2 (depends on 1)

The carriage assembly defined in claim 1, wherein said spring means is a torsion spring having a coil portion between said first and second ends thereof, said coil portion having a control axis oriented in parallel with the plane of said recording disk and transverse to said radial direction.

### Claim 3 (depends on 2)

The carriage assembly defined in claim 2, further comprising a pivot pin connected to said base and wherein said coil portion of said spring means surrounds said pivot pin.

### Claim 4 (depends on 3)

The carriage assembly defined in claim 3, further comprising an anchor, mounted on and extending downwardly from said support arm into the region between said base and said support arm, said second end of said spring means being connected to said anchor for pulling said support arm in the biasing direction.

### Claim 5 (depends on 4)

The carriage assembly defined in claim 4, wherein said anchor has a hole therein and said second end of said spring means extends into said hole.

### Claim 6 (depends on 2)

The carriage assembly defined in claim 2, wherein said first end of said spring means extends substantially perpendicular to the plane of the recording disk and said second end of said spring means extends substantially parallel to said support arm and to said recording disk.

### Claim 7 (depends on 6)

The carriage assembly defined in claim 6, wherein said second end of said spring means is disposed between said support arm and said base.

### Claim 8 (depends on 6)

The carriage assembly defined in claim 6, wherein the axis of said adjustment screw is oriented in said radial direction substantially parallel to the plane of said recording disk.