JPS6012709B2 - Magnetic head drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and more particularly to a magnetic head drive mechanism of a magnetic disk device.

In magnetic disk devices and magnetic disk pack devices, a large number of disks are stacked on the same axis at regular intervals, and one or more magnetic heads are placed on the surface of each disk to perform magnetic recording.

Furthermore, the storage capacity was increased by attaching a magnetic head to a carriage and driving the carriage in the radial direction of the disk for positioning. However, since such a device has a large number of heads and a complicated drive mechanism, the device is generally expensive. In order to provide a cheaper disk drive device, we changed the structure so that the magnetic heads, which were placed on each side, could be driven in any direction along the disk rotation axis.
Attempts have been made to record information on a large number of disk surfaces using a small number of magnetic heads since the advent of magnetic disk drives. Even in such an attempt, since the magnetic head is driven in the axial direction and the radial direction of the disk group, a driving source for each direction is required, and the mechanism is complicated and expensive. In addition, the radial drive source must move in the opposite direction together with the magnetic head, which has the disadvantage of increasing the weight to be driven when moving in all directions. An object of the present invention is to provide a magnetic head drive mechanism that can be constructed at low cost and can be driven in the axial and radial directions with a single drive source.

In order to achieve the above object, the magnetic head drive mechanism according to the present invention includes a shaft on which a feed screw is provided, a tooth profile that is the same as that of the feed screw, and a position where the tooth profile matches and a position where the tooth profile does not match in the axial direction. a rotating shaft consisting of a movable plate that can be moved between the rotating shafts; a drive source for rotating the rotating shaft; a slit on an inner periphery for receiving the movable plate when the movable plate is in a position where the tooth profiles do not match with each other in the axial direction; A screw coupled to the feed screw, a pinion having pinion teeth and notches on the outer periphery, a rack that engages with the pinion teeth of the pinion to convert rotational movement of the pinion into linear movement in a direction perpendicular to the rotation axis, and the rack. A movable part having a magnetic head 3 fixed to the rotary shaft and a movable plate of the rotary shaft are brought to a position where the tooth profile matches the feed screw, and are engaged with a notch of the pinion, so that the movable part has a magnetic head 3 fixed to the rotary shaft. the movable plate to a position where the tooth profile does not match the feed screw, and engage the pinion in the rotational direction of the rotating shaft;
The driving direction selecting mechanism is configured to separate from the notch of the pinion and move the movable part in a direction perpendicular to the rotation axis. According to the above configuration, the object of the present invention can be completely achieved.

Next, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of a magnetic head drive mechanism according to the present invention. The rotary shaft 1 is provided with a feed screw, and the shaft 1 has a movable plate 11 formed with the same tooth profile as the feed screw and movable between a position where the tooth profile matches and a position where the tooth profile does not match in the axial direction. It's accepted into the groove. The rotating shaft 1 is rotated by a drive source 2 such as a motor. A slit for receiving the movable plate 11 when the movable plate 11 is in a position where the tooth profiles do not match in the vehicle direction, and a screw screwed into the feed screw are provided on the inner periphery of the pinion 9. Further, pinion teeth are provided on the outer periphery of the pinion 9, and a notch 12 is provided on the flange portion.

The movable part 4 is provided with a rack 10 that engages with the pinion teeth of the pinion 9 and converts the rotational movement of the pinion into linear movement in a direction perpendicular to the rotation axis.

A magnetic head 3 is fixed to the rack. The drive direction selection mechanism moves the movable plate 11 of the rotary shaft 1 to its arm 5 when moving the movable part 4 forward or backward along the rotary shaft.
to the position where the tooth profile matches the feed screw, and the stopper 6 is engaged with the notch 12 of the pinion 9.

Further, the drive direction selection mechanism brings the movable plate 11 to a position where the tooth profile does not match the feed screw when moving the movable part 4 in a direction perpendicular to the rotating shaft 1.
The pinion 9 is rotatably engaged with the rotating shaft 1.

Also, the stopper 6 is removed from the /ch of the pinion 9.

Next, the configuration and operation of each part will be further explained with reference to FIG. 2 and subsequent figures.

FIG. 2 shows a side view of the pinion.

According to this, the pinion 9 has a notch 12 on the outermost circumference,
A plurality of slits 14 are provided in the inner peripheral portion 13 that engages with the rotating shaft 1.
has. It also has a gear portion 15 that engages with the rack 10. FIG. 3 shows the coupled state when the disks are moved in the radial direction, and FIG. 4 shows the coupled state when the disks are moved in the axial direction. Referring to FIG. 3, the solenoid 19 is not energized, and the movable plate 11 is pushed by the spring 18 to move to the right in the figure, and the stopper 6 is pushed down to the lower left via the arm 5. The movable plate 11 has a shape similar to the cross section of the rotating shaft 1, matches the outer shape of the rotating shaft in the state shown in FIG. 4, and can rotate within the pinion 9 like a rotating shaft without grooves. In the state shown in FIG. 3, the movable plate 11 enters the slit 14' of the pinion 9, and the pinion 9 and the rotating shaft 1 are in a coupled state. That is, the movable plate 17 hits the pinion inner circumferential portion 13, and relative rotation between the two is prevented. At this time, the pinion 9 also rotates as the rotating shaft rotates, thereby driving the rack 10 in the front and back direction. By driving the rack 10, the magnetic head 3 moves in the radial direction of the disk group 7.
When a predetermined radial position is reached, the rotary drive source 2 stops, and only data is written to or read from the disk surface via the magnetic head. When the data transfer is completed, the rotary drive source 2 rotates in the opposite direction to move the rack 10 backward.
At a predetermined stop position of the rack, the magnetic head 3 is pulled out from the outer periphery of the disk group 7, and the notch 12 faces the stopper 6. Although only one notch 12 is sufficient, four notches are shown in the figure. In the position where the notch 12 faces the stopper 6, the slit 14 also faces the groove and the movable plate 11. That is, the rotational drive source 2 is rotated, for example, by a step,
If it is a motor, the motor is the slit 14 of the pinion 9.
is stopped so that it always matches one of the following. FIG. 2 shows a case where the rotation stop positions of the motor are at intervals of 900. In this case, the axial position selection of the movable part is performed at intervals of 1/4 of the thread pitch of the rotating shaft. Next, when the solenoid 19 is energized, the bar 16 rotates and pushes up the stopper 6. Since the stopper 6 faces the notch 12, the arm 6 is rotated as the stopper 6 is inserted into the notch 12.
The arm 5 pushes the movable plate 11 to the left in the figure and the spring 18
Compress. At this time, since the slit 14 directly faces the movable plate 11, the movable plate 11 can move within the groove and the slit 14. When the solenoid completes suction, it will be in the state shown in Figure 4. When the rotary drive source 2 is driven in the state shown in FIG. 4, the movable plate and the rotary shaft 1 have the same cross section and rotate as one within the pinion 9.

Since the pinion 9 is prevented from rotating by the stopper 6 through the notch 12, it moves in all directions as the rotating shaft 1 rotates. By repeating the driving in the states shown in FIGS. 3 and 4, the magnetic head can be positioned in the vehicle mother direction and in the longitudinal direction. FIG. 5 shows an example of drive timing when this mechanism is used. As described above, according to the present invention, it is possible to move in two directions, forward and backward and in the event direction, with a single driving source, and a cheaper device can be provided.

Further, even during axial movement, the only weight to be driven is the movable part, so the driving force can be reduced. FIG. 6 is a schematic diagram showing the second embodiment.

According to FIG. 6, the second embodiment includes a driving gear 20, a driven gear 21 interlocked with the driven gear, a switching gear 22 for switching the rotation direction of the driven gear, and belts 23 and 24 interlocked with the driving gear 20 and the driven gear 21, respectively. , idle gear 25,2
6, 27 and a movable part 29 having a gear 28. In FIG. 6, when the drive gear 20 rotates in the direction of the arrow, the driven gear 21 and belts 23, 24 rotate in the directions of the arrows, respectively. Here, for the belts 23 and 24, for example, a roller chain, a timing belt, a thin steel plate with continuous holes, etc. are used. belt 23,2
Since the moving directions of gears 4 and 4 are the same, gear 28 does not rotate.
The movable part 29 moves in the left-right direction in the figure together with the belt. Next, by a switching mechanism (not shown), the coupling of each gear is switched to the state shown in FIG. 7.

In FIG. 7, the rotation direction of each gear is the direction shown, and the belts 23 and 24 are driven in opposite directions at a constant speed. At this time, the movable part does not move left or right, but gear 2
Only 8 rotates. The rotational motion of the gear 28 is converted into motion in the direction perpendicular to the figure by known methods such as worm gearing. Further, the switching mechanism can be realized by a combination of a lever, a solenoid, etc., as in the first embodiment. As described above, it is clear that the second embodiment also provides the same effects as the first embodiment.

As explained above, the present invention uses a drive force transmission mechanism in two directions from a single drive shaft and a drive direction selection mechanism, thereby simplifying the drive source and drive circuit, which conventionally required two sets, to one set. This has the effect of reducing driven weight.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is a side view of the pinion section, Fig. 3 is a view showing the coupled state when driven in the longitudinal direction, and Fig. 4 is shown when driven in the mari direction. FIG. 5 is a graph showing an example of drive timing, FIG. 6 is a schematic diagram for explaining the state during left-right direction driving in the second embodiment, and FIG. It is a schematic diagram for explaining the state at the time of front-back direction driving of an example. 1...rotating shaft, 2...drive source, 3...
...Magnetic head, 4...Movable part, 5...
...Arm, 6...Stopper, 7...Disc group, 8...Movable block, 9...Pinion, 10...Rack, 11...Movable plate, 12... ...notch, 14...slit, 16...lever, 18...spring, 19...soled/ide, 20...drive gear, 21...driven gear, 22... ...Switching gear, 23, 24...Belt, 25, 26, 27
...Idol Gear. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A shaft on which a feed screw is provided, a rotary shaft formed of a movable plate that is formed with the same tooth profile as the feed screw and can be moved in the axial direction between a position where the tooth profile matches and a position where the tooth profile does not match, and the rotary shaft. a driving source for rotating; a slit on an inner periphery for receiving the movable plate when the movable plate is in a position where tooth profiles do not match in the axial direction; a screw coupled to the feed screw; and a pinion having pinion teeth and a notch on an outer periphery. , a movable part having a rack that engages with pinion teeth of the pinion to convert rotational motion of the pinion into linear motion in a direction perpendicular to the rotational shaft, and a magnetic head 3 fixed to the rack; and the rotational shaft. bringing the movable plate to a position where the tooth profile matches the feed screw and engaging the notch of the pinion;
The movable part is moved in the direction of the rotation shaft, the movable plate is brought to a position where the tooth profile does not match the feed screw, the pinion is engaged in the rotation direction of the rotation shaft, and the pinion is disengaged from the notch of the pinion. . A magnetic head drive mechanism comprising a drive direction selection mechanism that moves the movable part in a direction perpendicular to the rotation axis.