JPS58125273A - Rotary arm actuator - Google Patents

Abstract

PURPOSE:To make a device small in size and thin, by turning an arm in contacting with a cam connected to a step motor. CONSTITUTION:An arm 1 is engaged with an arm supporting part 2 and a magnetic head supporting part 5, and the arm supporting part 2 has a bearing 3 and is rotated around a shaft 4. A magnetic head 6 is attached to the magnetic head supporting part 5. The arm 1 is turned by a cam 9 engaged with a rotation shaft 8 of a step motor 7, and the contacting pressure between the arm 1 and the cam 9 is kept proper by a spring 10 and a solenoid 11 connected to the spring 10; when the arm 1 is turned, the spring 10 is released by the solenoid 11 to reduce the rotation torque, and the burden of the step motor 7 is reduced; and in case of recording/reproducing where the arm 1 is made still, the solenoid 11 is attracted to bring the arm 1 and the cam 9 into contact with each other well.

Description

[Detailed description of the invention] The present invention is directed to a magnetic recording device Kll.

Details #i A rotating arm is used as a means for sending the magnetic head, and the arm is connected to a step motor and rotated by a nine cam. In order to further increase positional accuracy, a spring is used to improve contact between the arm and the cam. Regarding the rotating arm.

In the conventional rotary arm-7 cutter, one motor and a helical cam were installed on the shaft of the rotary arm, making it difficult to make the magnetic disk drive smaller and thinner. The positioning accuracy of the rotary arm is poor because a sufficient length to the arm axis cannot be provided, and furthermore, the movement area of the rotary arm is wasted space.

The present invention eliminates such drawbacks, and its purpose is to make magnetic disk drives smaller and thinner. Still another object is to improve the positioning accuracy of a rotating arm field actuator of a magnetic disk device.

The present invention will be described in detail below based on examples.

FIG. 1 is a schematic diagram of an embodiment of a magnetic disk drive including a rotary arm actuator of the present invention. 1st
In the figure, the arm l engages with the arm support part 2 and the magnetic head support part 5, and the arm support part 2 includes a bearing 3 inside and rotates around the shaft (40 revolutions). A magnetic head 6 is attached. The arm is a step motor 7
The arm is rotated by the cam 9 engaged with the rotating shaft 8 of the arm, while the spring 1 and the solenoid 11 connected to the spring maintain a suitable contact pressure between the arm and the cam, and when the arm is rotated. The solenoid is used to release the shaft panel, reducing the rotational torque and reducing the burden on the step motor.When recording and playing with the arm stationary, the solenoid is sucked to improve the contact between the arm and the cam and improve the accuracy of arm feeding. Furthermore, 12 is a disk which is a magnetic recording medium, 13 is a magnetic recording/reproducing area in the disk, 13 is a spindle for rotating the disk, and 15 is a frame. Note that the number of parts can be reduced by fixing the end of the spring IO that is not connected to the arm and pressing the arm against the cam with a specific force instead of using the solenoid. If the configuration shown in FIG. 1 is adopted, a simplified rotary arm actuator can be obtained, and the magnetic disk device can be made smaller and thinner.

FIG. 2 shows a rotating arm portion of an embodiment of the present invention. 21 #i upper arm, η is upper head n is upper shield plate, Sae is upper head support mechanism, 5 is upper head support mechanism attachment part, S is lower arm, 4 is lower head, public is lower shield plate, 29 companies Lower head support mechanism, 30 tf lower head support mechanism attachment part, 31 is a spring stopper, the proverb is a spring, the shaft is 34
is bearing, 35Fi positioning pin, 36#i upper arm support part, 37t: lower arm support part, 38#i, arm stand,
39 is an arm guide, 4o is an arm guide rail, 41
The cam contact portion 42 is a disk. The head is in stable contact with the disk (by the head support mechanism), and the shield IN
It is more magnetically shielded than the K, and is made so that it does not affect the rotation of the arm. The structure from the head section to the arm K is the same above and below. A spring is inserted into the shaft of the arm support part to allow the upper arm to float, allowing the disk to be taken in and out, and the upper and lower positions are determined using pins. In the case of FIG. 2, the shaft is fixed to an arm stand, and a lower arm support fixed to the outer ring of the bearing and an upper arm connected to the lower arm support with a pin rotate simultaneously.

Furthermore, in order to rotate the arm by contacting the lower arm with the cam, a cam contact part is provided using a material with little wear, and in order to stabilize the rotation of the arm, a rail and a rail guide are used. The arm length is made to minimize the deviation of the angle formed by the head and the recording/reproducing track, and the point of contact between the arm shaft and the cam is set so that the distance between the arm shaft and the contact point is as short as possible within 7 frames. ) decide to make it bigger.

As mentioned above, Akira Honse has improved the feeding accuracy of the rotating arm actuator (by using a cam), and has also made it possible to make effective use of the arm's movement area. It has an excellent effect of enabling miniaturization and thinning, and is useful for extremely small magnetic disk drives.

[Brief explanation of drawings]

Figure 1 shows -! of the present invention. J! FIG. 2, which is an overview diagram of the embodiment, shows a specific example of the rotary arm, which is round. In the first WJK, 1 is an arm, 2 is an arm support part 3 is a bearing, 4 is a shaft, 5 is a head support part, 6 is a magnetic head, 7F
i step motor, 8 is shaft, 9F1. Cam, 1 (l is spring, 1) is solenoid, 12Fi, disk. Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Mogami' - Sodo No. 11-': Figure 2

Claims (1)

[Claims] (11) In a rotary arm actuator having at least a magnetic head, an arm for supporting the magnetic head, a shaft and a bearing for rotating the arm, the arm is moved by a step motor. A rotary arm actuator that is rotated by contact with a cam connected to the rotary arm. The rotary arm actuator according to claim 1, characterized in that the arm is positioned by releasing the spring at times and pressing the arm against the cam (by the spring when at rest). (Claim 31) Claim 1, characterized in that when a spring is used in the parts constituting the shaft and bearing as set forth in claim 1, the rotating arm is always pressed against the cam to position the arm. Rotary arm actuator.