JPH0229577Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a disk drive device that writes information to a disk using a magnetic method or the like, or reads written information, and particularly relates to a disk drive device that uses a magnetic method or the like to write information to a disk or read written information. This invention relates to a carriage drive mechanism that reciprocates a member in the radial direction of a disk.

[Prior art]

FIG. 1 (plan view) and FIG. 2 (side view) show a carriage drive mechanism of a magnetic recording/reproducing device as an example of a conventional disk drive device.

To explain the operation, first, a magnetic disk 3 is loaded onto a spindle 2 connected to a motor (not shown). Then, the magnetic head 8 provided on the carriage 6 comes into sliding contact with the surface of the magnetic disk 3 (on the lower side in the drawing). Note that holders 6a to 6c are formed on both sides of the carriage 6, and these holders 6a to 6c are slidably inserted into the guide rail 5. Then, when an operation switch (not shown) is turned on, the motor is driven and the magnetic disk 3 is rotated by the spindle 2. Along with that,
Stepping motor 1 fixed to frame 16
0 rotates by the set angle. Then, the feed screw 11 connected to the stepping motor 10 is driven to rotate. This feed screw 11 is provided parallel to the guide rail 5. On the other hand, drive pin 1
4 is caulked to the tip of the leaf spring 17 and pressed against the thread groove 11a of the feed screw 11. The base end of this leaf spring 17 is fixed to the end surface of the carriage holder 6a. Therefore, when the stepping motor 10 rotates, its rotational motion is converted into a reciprocating motion by the drive pin 14 and transmitted to the carriage 6. As a result, the carriage 6 reciprocates on the guide rail 5 according to the rotation direction and rotation angle of the stepping motor 10. During this time, the magnetic head 8 provided on the carriage 3 reciprocates in a direction transverse to the scanning line of the magnetic disk 3 to write information on the magnetic disk 3, or
Read written information.

[Problems with conventional technology]

However, the conventional carriage drive device described above has the following problems.

(1) Since the leaf spring 17 is flexible, it bends when the carriage 6 is sent toward the spindle 2 (Fig. 2), and warps when it moves away from the spindle 2. (3rd
figure). The responsiveness of the carriage 6 deteriorates by the amount of the above-mentioned bending and warping.

(2) On the other hand, if the leaf spring 17 warps or bends, the drive pin 14
This means that they are pressed into contact with each other in an inclined position with respect to a. This means that the thread groove 11a and the drive pin 14
This will cause a conflict between the two.

(3) Furthermore, if the leaf spring 17 warps or flexes, the drive pin 14 attached to the leaf spring 17 will loosen over time.

[Purpose of this invention]

The present invention was made by focusing on the above-mentioned conventional problems, and the initial movement of the carriage or
To provide a carriage drive device for a disk drive device in which the carriage is moved accurately without causing movement delay during reversal operation, without loosening the drive pin itself, and always in contact with the feed screw in a constant posture. It is intended to.

[Structure of the present invention]

The carriage drive mechanism according to the present invention is provided with a spindle for driving a disk, a guide rail and a feed screw arranged in parallel, and a carriage that is movably placed on this guide rail is connected to the drive pin via a drive pin. In a disk drive engaged with a lead screw, the drive pin is attached to a rigid plate, one end of which overlaps the plane of the carriage, and the end of the plate on the overlapping side supported by a spring. The present invention is characterized in that a spring is provided which is connected to the carriage via a member and urges the plate in a direction in which the drive pin is pressed by the feed screw.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to FIG. 4 and subsequent drawings.

FIG. 4 is a plan view of a carriage drive device of a magnetic recording/reproducing device, which is an example of a disk drive device;
The figure is a side view thereof, and FIG. 6 is an exploded perspective view thereof.

(Structure) In FIG. 5, the reference numeral 1 in the figure is a motor. A spindle 2 is connected to this motor 1. This spindle 2 has a magnetic disk 3
The hub 4 and the like are loaded.

On the other hand, two parallel guide rails 5 extend radially from the axis of the spindle 2. This 2
The rear end of the book guide rail 5 is supported by a frame 16 erected on the main body base. Further, this guide rail 5 also has holders 6a to 6a for the carriage 6.
6c is slidably inserted through a bearing 19. This carriage 6 includes an under arm 7 and an upper arm 7a (a fourth
(omitted in the figure) is provided. This under arm 7 is formed integrally with the carriage 6 and faces the lower surface of the magnetic disk 3, and a magnetic head 8 is fixedly installed on the upper surface. Further, a head pad 9 facing the magnetic head 8 is bonded to the upper arm 7a. The base of the upper arm 7a is rotatably supported on the carriage 6 via a pin 13, and is pushed toward the under arm 7 by a torsion spring 15 that hooks one end to the carriage 6. energized.

On the other hand, in FIG. 4, reference numeral 11 is a feed screw. This feed screw 11 is provided parallel to the guide rail 5. This feed screw 11 has a right-handed screw groove 11a carved therein, and a pin shaft 11b is integrally formed at the tip. The base end of this feed screw 11 is connected to a stepping motor 10 fixed to a frame 16, while the pin shaft 11b at the tip is connected to a bearing 19 with respect to a bracket 18 erected on the main body base.
Supported through. A support spring 20 is attached to this bracket 18. This support spring 20 presses the tip of the pin shaft 11b and biases the feed screw 11 in the direction of the stepping motor 10.

(Description of Characteristic Parts) By the way, as shown in FIGS. 4 and 6, the holders 6a and 6b formed on the carriage 6 are
extends in the direction of the feed screw 11. A leaf spring 17a is fixed to the end surface of one holder 6a with a screw 21. One end of this leaf spring 17a projects slightly in the direction from the holders 6a to 6b, and the base of the plate 22 is caulked to this projecting portion with a rivet 23. This plate 22 has rigidity. Note that the base end of this plate 22 overlaps the end surface of the holder 6a. This is to suppress deflection of the leaf spring 17a as much as possible. On the other hand, a hole 6d of a predetermined depth is bored in the end surface of the holder 6b. A tension spring 23 is installed in this hole 6d.
The free end of the plate 22 is pressed in the direction of the feed screw 11 by the tension spring 23. On the other hand, a drive pin 14 is caulked to the free end side of the plate 22 slightly from the middle thereof. The tip of this drive pin 14 is connected to the feed screw 11.
The screw groove 11a is pressed against the screw groove 11a.

(Operation) Next, the operation of the embodiment with the above configuration will be explained.

Upper arm 7a provided on the carriage 6
When the magnetic disk 3 is not inserted into the device, it is biased upward against the torsion spring 15 (the state indicated by the chain line in FIG. 5). Then, the magnetic disk 3 is inserted into the device from an insertion port of a disk drive device (not shown), moved onto the spindle 2 along the guide, and when the hub 4 of the magnetic disk 3 is loaded onto the spindle 2, the upper arm 7a The upward biasing force is released, and the pin 13 pivots downward around the pin 13 due to the pressing force of the torsion spring 15. A head pad 9 provided on the upper arm 7a presses the magnetic disk 3 against the magnetic head 8 on the lower arm 7. Next, turn on the operation switch (not shown)
Then, the motor 1 is driven and the magnetic disk 3 is rotated in a predetermined manner. Meanwhile, at the same time, the stepping motor 10 is driven, and the feed screw 11 begins to rotate intermittently by a set angle. Then, the drive pin 1 pressed against the thread groove 11a of the feed screw 11
4 is guided by the thread groove 11a and moves. Since the drive pin 14 is connected to the carriage 6 via the plate 22 and the leaf spring 17a, the carriage 6 follows the movement. During this time, since the plate 22 has rigidity, it will not bend due to the inertial force when the carriage 6 moves. Also,
Since the free end of the plate 22 is pressed by the tension spring 23, the leaf spring 17a will not warp or bend. Therefore, the drive pin 14 is pressed against the thread groove 11a in a constant posture. Furthermore, since the end of the plate 22 supported by the leaf spring 17a overlaps with the end face of the holder 6a, the displacement of the plate 22 supported by the leaf spring 17a in the torsional direction is suppressed by the end face of the holder 6a. Become. Therefore, displacement of the drive pin 14 that engages with the feed screw 11a in the falling direction (falling displacement in the direction perpendicular to the plane of the paper in FIG. 4) does not occur.
As a result, the carriage 6 accurately reciprocates on the guide rail 5 according to the rotation direction and rotation angle of the feed screw 11, and the magnetic head 8 provided on the under arm 7 of the carriage 6 moves the magnetic disk 3. Slide in the direction across the scanning line. and,
During this time, the magnetic head 8 reads information recorded on the magnetic disk 3 or writes new information to the magnetic disk 3.

Note that the disk drive device is not limited to a magnetic recording/reproducing device, and may be of other types such as an optical reading type.

[Effects of this invention]

As described above, according to the present invention, since the end portion of the plate supported by the spring member overlaps the surface of the carriage, the displacement of the plate supported by the spring member in the torsional direction causes the carriage to move in the overlapping portion. This prevents the drive pin that engages with the feed screw from being displaced in the falling direction. Further, since the plate is biased by the spring so that the drive pin is pressed against the feed screw, the drive pin is prevented from falling in the axial direction of the feed screw. As described above, since the overlapping portion prevents the plate from torsionally displacing, and the plate is biased by the spring, it is possible to reliably prevent the drive pin from falling due to the rotational force of the feed screw. become. Therefore, the drive pin can always be pressed into contact with the feed screw in a constant posture, preventing unnecessary bumps and the like from occurring between the drive pin and the feed screw, and making it possible to accurately reciprocate the carriage. become able to.

[Brief explanation of the drawing]

Figure 1 is a plan view of the carriage drive mechanism of a conventional disk drive device, and Figures 2 and 3 are A of Figure 1.
Fig. 4 and the following are plan views showing embodiments of the present invention, Fig. 4 is a plan view of the carriage drive mechanism of the disk drive device, Fig. 5 is a side view thereof, and Fig. 6 is a plan view showing the parts according to their states. is an exploded perspective view of main parts. 2...Spindle, 5...Guide rail, 6...
...Carriage, 10...Stepping motor, 1
1...Feed screw, 14...Drive pin, 17a...
Leaf spring, 22... plate.

Claims (1)

[Scope of utility model registration request] A spindle for driving the disk, a guide rail and a feed screw arranged in parallel are provided, and a carriage movably placed on the guide rail is engaged with the feed screw via a drive pin. In the disk drive device, the drive pin is attached to a rigid plate, one end of which overlaps the surface of the carriage, and the end of the plate on the overlapping side connected to the carriage via a spring member. A carriage drive mechanism for a disk drive device, further comprising a spring that biases the plate in a direction in which the drive pin is pressed by the feed screw.