# US 5,706,574 A · Assembly method of carriage assembly of magnetic disk drive

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- Number: US 5,706,574 A
- Document ID: US5706574A
- Status: Granted
- Kind: A
- Application number: 08/583,459
- Filed: 1996-01-05
- Granted: 1998-01-13
- Earliest claimed: 1993-09-14
- Assignees: Kabushiki Kaisha Toshiba
- Inventors: Machio Shimanuki
- Web page: https://patentgrep.com/patent/US5706574A

## CPC

- G11B 5/4813: {Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm (G11B5/484 takes precedence)}
- G11B 5/4826: {Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56)}
- Y10T 29/49025: Making disc drive
- Y10T 29/49027: Mounting preformed head/core onto other structure
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In a method of assembling a carriage assembly, all first magnetic head assemblies facing first surfaces of magnetic disks are attached to associated arms of the carriage. Each of the magnetic head assemblies is fixed to one side surface of an associated one of the arms, by fitting and calking the mount portion of the first magnetic head assembly in the through-hole of the associated arm. Subsequently, all second magnetic head assemblies facing second surfaces of the magnetic disks are attached to the arms. Each of the second magnetic head assemblies is fixed to the other side surface of the associated one of the arms, by fitting and calking the mount portion of the second magnetic head assembly in the through-hole of the associated arm.

## Claims

### Claim 1

A method of assembling a carriage assembly of a magnetic disk drive, the carriage assembly including a carriage with a plurality of arms arranged in parallel at predetermined intervals, each arm having an end portion in which a single through-hole is formed, and a plurality of first and second magnetic head assemblies with cylindrical mount portions each having an outer diameter substantially equal to the diameter of each of the through-holes, each of the first magnetic head assemblies being fixed to one side surface of an associated one of the arms with the mount portion being engaged in the through-hole of the associated arm, each of the first magnetic head assemblies facing one surface of an associated one of magnetic disks situated between adjacent ones of the arms, each of the second magnetic head assemblies being fixed to the other side surface of an associated one of the arms with the mount portion being fitted in the through-hole of the associated arm, each of the second magnetic head assemblies facing the other surface of the associated one of the magnetic disks, each magnetic disk being interposed between a pair of the mutually facing first and second magnetic head assemblies,
said method comprising the steps of:
fixing each of the first magnetic head assemblies to one side surface of an associated one of the arms, by fitting and calking the mount portion of the first magnetic head assembly in one end of the single through-hole of the associated arm; and
fixing each of the second magnetic head assemblies to the other side surface of the associated one of the arms, after the first magnetic head assemblies are fixed, by fitting and calking the mount portion of the second magnetic head assembly in the other end of the single through-hole of the associated arm.

### Claim 2 (depends on 1)

A method according to claim 1, wherein the calking step includes passing a steel ball under pressure through an inner hole of the mount portion engaged in the through-hole, the steel ball having a diameter greater than the inner diameter of the mount portion.

### Claim 3 (depends on 2)

A method according to claim 2, wherein the calking step includes passing the steel ball through the inner hole of the mount portion of the first magnetic head assembly from the one side surface side of the associated one arm toward the other side surface side of the associated one arm, and passing the steel ball through the inner hole of the mount portion of the second magnetic head assembly from the other side surface side of the associated one arm toward the one side surface side of the associated one arm.