JPH0127173Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head transfer mechanism for a magnetic disk drive.

A magnetic disk drive device, which is generally known as a floppy disk drive device, is a disk-shaped magnetic disk held in a square diskette, which is loaded into the device together with the diskette. A large number of concentric magnetic tracks are recorded on the magnetic disk by moving a recording/reproducing head that is placed opposite to or in contact with both sides of the magnetic disk through openings provided at predetermined positions of the magnetic disk, or for reproducing the recorded data. It is a device.

Therefore, in the above-described magnetic disk drive device, in order to perform recording and playback correctly, it is necessary to accurately move the recording/reproducing head toward the center of rotation of the magnetic disk (that is, to move the head in a straight line).

However, as shown in FIG. 1, the conventional head transport mechanism has a structure in which the carrier 1 carrying the recording/reproducing head 1a is moved straight in conjunction with the rotation of the worm 2a of the step motor 2. The element 1a' is connected to the concentric magnetic track 3 of the magnetic disk 3.
It was difficult to transport the objects in a state that was exactly orthogonal to the normal line of a, 3b, . . . . Therefore, in the conventional head transfer mechanism, the carriage 1 and the worm 2a had to be machined with high precision, which resulted in disadvantages in terms of cost and insufficient precision.

The present invention has been devised in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a head transport mechanism that allows a recording/reproducing head to move in a straight line with a simple structure.

The object of the present invention is achieved by a structure in which the head carrier and the worm of the step motor are separated and connected through point contact, and the movement of the head carrier is guided by a guide member.

The present invention will be explained below based on an embodiment shown in the drawings.

First, FIG. 2 is a plan view schematically showing the magnetic disk drive device, and FIG. 3 is a plan view showing only the main parts extracted from FIG. 2.

In the figure, reference numeral 11 denotes a step motor, which consists of a worm 11a that moves straight due to the rotation of a rotor (not shown), a disk 11b held at the tip of the worm 11a, and a substrate 17, which will be described later.
is attached to.

Reference numeral 12 denotes a head carrier, which is equipped with a head 12a and an eccentric run 12b, and is slidably held on a guide rail 13 attached to the board 17, and is given a rightward movement habit by a spring 14. However, the collar 12b is in contact with the disk 11b and is restrained. Note that the collar 12b is rotatable and can be adjusted by slightly moving the head carrier 12.

Therefore, when the worm 11a moves straight to the left due to the operation of the step motor 11, the head carrier 12 slides to the left against the spring 14, and then the worm 11a moves straight to the right. For example, the head carrier 12 is slid to the right by the spring 14. Therefore, in the meantime, the element 12a'
The head carrier 12 moves back and forth in a state perpendicular to the normal line of the magnetic track 3 (FIG. 1), but this movement is carried out because the head carrier 12 is guided by the guide rail and the worm 11a and the eccentric run 12b only make point contact. This is done accurately because it has nothing to do with the non-straight movement of the worm 11a.

Incidentally, the above-mentioned operation is performed when the pad 27 is applied to the magnetic disk 3.
Needless to say, this is performed with the pad lever 27 further turned to the left from the state in which the pad levers 27a are in contact with each other, that is, the state shown in FIG. 6, which will be described later.

Therefore, other configurations of the magnetic disk drive device will be briefly described below.

Reference numeral 17 denotes a substrate, with guide grooves 17c and 17d formed on side surfaces 17a and 17b, and a front surface 17e.
A window 17f is formed in the window 17f. 19 is a housing, which includes a top plate 19a, side plates 19b and 19c, and a bottom plate 1.
9d, is slidably held on the side surfaces 17a, 17b of the substrate 17 via pins 19e, 19f set on the side plates 19b, 19c, and is held on the back side of the paper (the side of the paper) by a spring (not shown). 2
A force is applied toward the locking member (see Figure), but is restrained by a locking member (not shown).

21 is a head load lever, and arm portions 21a, 2
1b, is pivotally connected to the bent portion 19g of the housing 19 by a shaft 22, and has a spring 23.
Although the arm portion 21a is imparted with a left-handed rotation habit (FIG. 4), the arm portion 21a abuts against the upper plate 19a of the housing 19 and is restrained. Reference numeral 25 denotes a plunger-type electromagnetic device, which consists of a plunger 25a having a tapered cylindrical portion 25b, and is attached to the substrate 17. 27 is a pad lever, pad 27a,
It has an arm portion 27b, which is rotatably held on the head carrier 12 by a shaft 28, and is provided with left-handed rotation behavior (FIG. 5) by a spring 29. The arm portion 21b abuts and is restrained. 31 is a motor for rotating the magnetic disk.

Next, operations of the other configurations mentioned above will be explained.

First, in the state shown in FIG. 2 (FIG. 5), when the magnetic disk is pushed into the housing 19 through the window 17f, the lock is released and the housing 19
is lowered (FIG. 5) by the action of the spring to the state shown in FIG. At this time, the head load lever 21 also descends, so the head load lever 27
is rotated to the left by the spring 29 (FIG. 6), but the pad 27a does not press the magnetic disk 3. Therefore, if the motor 31 is operated in this state, the magnetic disk 3 will rotate, but recording or reproduction will not be possible. In order to perform recording or playback, the electromagnetic device 25 is further activated to attract the plunger 25a,
The head load lever 21 must be rotated to the right (FIG. 4) against the spring 23 by the tapered cylindrical portion 25b. That is, the pad lever 27, which has been released from its restraint by this clockwise rotation, is further rotated to the left by the spring 29, and the pad 27a presses the magnetic disk 3. Conversely, if the plunger 25a is made to protrude via the electromagnetic device 25 while the magnetic disk 3 is rotating, the pad lever 27 is moved from the head load lever 2.
The pad 27a is rotated slightly to the right by the counterclockwise rotation by the spring 23 of No. 1 (FIG. 4), and the pad 27a is separated from the magnetic disk 3 (FIG. 6).

The above is a description of the embodiment of the head transfer mechanism according to the present invention and the magnetic disk drive device equipped with this head transfer mechanism, but it goes without saying that the present invention is not limited to this embodiment.

For example, as a means for bringing the head carrier 12 and the worm 11a of the step motor 11 into point contact in the head transfer mechanism, as shown in FIG.
It may also be a wedge 35 attached to the head carrier 12 via a bolt 33 and a spring 34. In this configuration, by rotating the bolt 33, the wedge 3
By moving up and down 5, the head carrier 12
The alignment of the head 12a (more specifically, the element 12a') with respect to the magnetic disk 3 can be adjusted by slightly moving the head 12a in the left-right direction.

Further, the above-mentioned alignment adjustment can also be made by manually twisting the main body of the step motor to cause the worm to move slightly in a straight line.

As mentioned above, the present invention has a structure in which the head carrier and the step motor worm are separated and connected in a point contact state, and a member is provided to guide the slide of the head carrier, so the accuracy of the connection between the worm and the head carrier is irrelevant. This has the effect that the head carrier can slide in a straight line, and the straightness of the head carrier can therefore be maintained with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional example, FIG. 2 is a plan view of a magnetic disk drive device equipped with a head transfer mechanism according to the present invention, FIG. 3 is a plan view of a head transfer mechanism according to the present invention, and FIG. 2. FIG. 5 is a sectional view taken along A-A in FIG. 2. FIG. 6 is a sectional view showing the operating state of FIG. 5. FIG. 7 FIG. 3 is a sectional view showing another embodiment of the head transfer mechanism. 11...Step motor, 11a...Worm, 11b...Disk, 12...Head carrier,
12a...Head, 12a'...Element, 12b...
Eccentric run (point contact means), 13... guide rail (guide member), 14... spring.

Claims (1)

[Claims for Utility Model Registration] In a magnetic disk drive device that records or reproduces a large number of concentric magnetic tracks on a rotating magnetic disk by reciprocating a head carrier, a step motor including a rotor and a worm that moves in a straight line due to the rotation of the rotor; a spring member that gives the head carrier a tendency to move toward the distal end surface of the worm; and the head carrier. A head transfer mechanism comprising: and means for bringing the tip end surface of the worm into point contact.