JPS60256982A - Device of turning deive of disc - Google Patents

Abstract

PURPOSE:To attain stable recording and reproduction to/from a disc by providing a linear moving mechanism to a spindle hub of a turning driver, setting the moving direction of the linear moving section to radial direction of the spindle hub and providing a drive pin to the linear moving section of the linear movement mechanism. CONSTITUTION:The drive pin 16 is fitted to the linear movement section 15a of a drive pin support lever 15 constituting the linear movement mechanism provided at the back side of the spindle hub 10 with a pin 16 and energized upward by a coil spring 17 arranged on the linear movement section 15a. Thus, when a disc is loaded on the spindle hub 10 and an engaging hole 13 of the disc hub 10 and the drive pin 14 are not coincident, the drive pin 14 is descended against the energizing force of the coil spring 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotational drive device for a disk-shaped recording medium such as a magnetic disk.

[Prior art]

A rotary drive device having a drive pin for rotating a disk on a spindle hub rotationally driven by a motor is, for example, as shown in FIGS. 4 and 5 in Japanese Utility Model Application No. 57-102071 Structures are known. In the above-mentioned conventional rotary drive device, a leaf spring 2 is fixed to the back surface of a spindle hub 1 that rotates integrally with a spindle 5 by a screw 3.4, and a tongue-shaped portion 2a formed on this leaf spring 2 has a A drive pin 6 is provided for rotationally driving a disk such as a magnetic disk. The drive pin 6 protrudes to the front side of the spindle hub 1 (the side where the disk is attached) through a hole 1a provided in the spindle hub 1, and engages with an engagement hole formed in a disk hub such as a magnetic disk. and are adapted to drive the disk in rotation.

In the conventional rotary drive device described above, the spindle 5 is inserted into the central square hole 7a of the disk hub 7, as shown in FIG. When the disk hub 7 is placed on the spindle hub 1 and the spindle hub starts rotating, the drive pin 6 that was pushed inward in the radial direction of the spindle hub 1 by the disk hub 7 and submerged in the hole la, When it reaches the bottom of the engagement hole 7b, the disk hub 7 is pushed radially outward of the spindle hub 1 by the radially outward positioning force (biasing force) of the spindle hub 1 of the leaf spring 2, and the proper position of the retaining hole 7b is pushed. It engages in the locking position 7C.

With this positioning force I, the two sides a and b of the square hole 7a
These two points always come into contact with the spindle 5, thereby positioning the center of rotation of the disk.

However, in the conventional rotary drive device, since the drive pin 6 is fixed to the plate spring 2 (,M), when the drive pin 6 engages with the regular locking position 7C of the engagement hole 7b, the drive pin 6 The pin 6 may tilt in the circumferential direction of the spindle hub 1 due to the load on the disk.If the amount of tilt of the drive pin 6 changes due to changes in the load on the disk, the spindle hub 1
The relative positional relationship between the index pulse generating element installed in the rotor case of the motor that drives the disk hub and the disk hub will be misaligned, causing the index pulse generation timing to be misaligned and the writing start position to the disk to be inconsistent, resulting in disc failure. This had the disadvantage of losing compatibility.

Furthermore, since the drive pin 6 supported by the leaf spring 2 can tilt inward in the radial direction of the spindle hub 1, if the positioning force is strong, the disk hub 7 may remain lifted due to the impact during chucking. In some cases, as shown in FIG. 7, the retaining hole 7b and the drive pin 6 get caught and do not come into complete contact with the disk hub 7. If this condition remains, recording and reproduction on the disk becomes unstable, resulting in errors.

[Purpose of the invention]

It is an object of the present invention to prevent a disk from being driven while the drive pin and disk hub are incompletely engaged, to prevent a shift in the timing of index pulse generation, and to maintain disk compatibility. It is an object of the present invention to provide a disk rotation drive device in which recording and reproduction on a disk is stable.

[Structure of the invention]

A feature of the present invention is that in a disk rotation drive device, the linear motion portion ( A linear motion mechanism that moves in the -linear direction (including approximate linear motion) is installed in the spindle hub of the rotary drive device, and the moving direction of the linear motion section is set in the radial direction of the spindle hub. This is because the drive pin is provided in the linear motion part of the mechanism.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of an embodiment of the present invention. 1st
As shown in FIG. 3, the spindle knob 10 and the spindle 11 are fixed so as to rotate together, and the spindle hub 10 has a disk hub made of a metal magnetic material that is tightly attached to the spindle knob 10. A magnet 12 is attached to the device.

The spindle hub 10 is provided with a circular hole 13 from which a drive pin 14 projects.

The drive pin 14 is attached with a pin 16 to a linear motion part 15a of a drive pin support lever 15 that constitutes a linear motion mechanism provided on the back surface of the spindle hub 10, and is attached to a coil spring 17 disposed on the linear motion part 15a. is biased upward.

Therefore, when a disk is placed on the spindle hub 10 and the retaining hole 7a of the disk hub does not match the drive pin 14, the drive pin 14 will fall against the biasing force of the coil spring 17. It is configured as follows.

The drive pin support lever 15 is connected via a fixed rotating shaft 1B to a rotating lever 19 held on the back surface of the spindle hub 10 via a movable rotating shaft, and is connected to the spindle hub 10 via a fixed rotating shaft 21. C held on the back side of
It is also connected to the mold rotation lever 22 via a moving rotation shaft to constitute a linear movement mechanism.

The above-mentioned moving rotation shaft connects the pin portion 20.23 formed integrally with the drive pin support lever 15 to the rotation lever 19.23. It is constructed by fitting into holes 19a and 22a formed in the C-shaped rotating lever 22, respectively. Further, a spring 25 is hooked between the fixed rotation shaft 21 and the movable rotation wheel 20, so that the drive pin 14 is always urged outward in the radial direction of the spindle hub 10 to obtain a positioning force I. It has become.

According to the rotary drive device configured in this way, the drive pin 14 moves the spindle hub 10 in the radial direction by the positioning force I of the spring 25, but the drive pin 14 is connected to the rigid drive pin support lever -15. Because it is fixed, it will not tilt (this means that the disc will be positioned reliably).

Since the drive pin 14 does not tilt, the relative position between the disk and the spindle hub 10 is always constant when the disk is positioned, so it is possible to prevent a shift in the timing of index pulse generation caused by this. In addition to maintaining the compatibility of the disk, recording and reproducing errors can also be prevented since the disk is not rotated while the disk hub's retaining hole 7b and the drive pin 14 are caught in the middle.

The movement range of the drive pin 14 is regulated by a circular hole 13 formed in the spindle hub 10, and the movement range is such that the drive pin 14 engages with the engagement hole 7b of the disk hub when the disk is rotationally driven. This is within the range for reliable engagement.

Further, the spindle 11 may also be used as a support shaft for one of the fixed rotating shafts.

FIG. 2 is a view of the linear motion mechanism portion of the present invention viewed from the back side of the spindle hub 10, and the linear motion mechanism portion is supported from below by the rotor case 24 of the motor as shown in FIG. There is.

That is, a recess 26 is formed inside the back side of the spindle hub 10, and the drive pin support lever 15 is inserted into the recess 26.
, a rotating lever 19, and a C-shaped rotating lever 22 are movably arranged to constitute a linear motion mechanism, and the lower surface of the spindle hub 10 and the rotor case 24 are brought into contact with each other, and the rotor case 24 and the spindle hub 10 are brought into contact with each other. The linear motion mechanism is held by screwing and fixing.

Further, in order to allow the drive pin 14 to move downward, the linear movement part 15a of the drive pin support lever 15 is bent and formed, and the linear movement part 15a is fitted into a notch 27 formed in the rotor case 24 so as to be raised. This is done so that the dimension in the longitudinal direction does not increase.

Note that instead of directly supporting the linear motion mechanism part with the rotor case 24, a separate support plate or the like is attached to the spindle hub 10.
It may also be supported by being attached to it.

To explain the principle of the linear motion mechanism in the first embodiment using FIG. 8, the linear motion section to which the drive pin is attached is indicated by A, the fixed rotating shaft supported by the spindle hub 10 is indicated by B, C corresponds to a movable rotating shaft that rotatably connects the respective levers to each other, and E corresponds to the movable rotating shaft. The linear motion section A is biased outward in the radial direction of the spindle hub 10 by a spring F that is passed between the movable rotation axis and the fixed rotation axis C. This creates a force in one direction,
Disc positioning can be performed. The movement mechanism itself composed of these three levers is called a locust-shaped approximate linear movement mechanism, and the present invention provides a disk hub drive pin in the linear movement part of this mechanism, and also directs the direction of linear movement to the spindle hub. radial direction.

Strictly speaking, the movement rotation axis E draws an arc centering on B and C, respectively, so the direction of movement of A is also a perfect straight line and an arc that closely approximates a straight line, but the range of movement of A is Since it is small, it can be considered that it is moving substantially in a straight line.

The effects aimed at by the present invention can be achieved not only by the linear motion mechanism described above, but also by using other linear motion mechanisms or approximate linear motion mechanisms.

Other examples include a Scott-Russell approximate linear motion mechanism in which one of the movable rotating shafts D is slidable within a guide groove G formed in the spindle hub 10, as shown in FIG. Although it does not have a rotating shaft, it has two moving rotating shafts, E is a guide groove G formed in the spindle hub 10.
, H, configured to slidably move within H.
The disk may be positioned using a Reuleaux linear motion mechanism as shown in the figure.

Note that the reference numerals in FIGS. 8, 9, and 10 are the same.

〔Effect of the invention〕

In the present invention, a linear motion part (including approximate linear motion)
- A linear motion mechanism that moves in a linear direction is provided on the spindle hub of the disk rotation drive device, the moving direction of the linear motion section is set in the radial direction of the spindle hub, and the linear motion section of the linear motion mechanism is provided with the drive By providing a bin, the positioning force can be obtained without tilting the drive pin, which prevents a shift in the index pulse generation timing due to a shift in the relative position between the disk and the spindle hub. It is possible to provide a disk rotation drive device that can maintain compatibility and prevent recording/reproduction errors caused by the drive bin and the retaining hole getting caught.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of a rotational drive device according to the present invention. FIG. 2 is a rear view of the above embodiment. FIG. 3 is a side sectional view of the above embodiment. 4 and 5 are a plan view and a side view of a conventional example. FIG. 6 is a plan view showing the engagement relationship between a conventional disc hub and a drive bin. FIG. 7 is a side view showing the engagement relationship between a conventional disc hub and a drive pin. FIG. 8, FIG. 9, and FIG. 10 are principle diagrams showing the principle of the linear motion mechanism in the present invention. io, ..., spindle hub, 14. , , , Drive bin 15 , , Drive bin support lever 19 . ,, Rotating lever, 22, , C-type rotating lever, 7b, , Retaining hole. Applicant Sankyo Seiki Seisakusho Co., Ltd. Agent Patent Attorney Hideharu Watanabe Figure 9 Figure 8

Claims (1)

[Claims] In a disk rotation drive device that rotates the disk by engaging a drive pin with an engagement hole formed at an eccentric position with respect to the center of the disk, the linear motion part moves in a straight line in a straight line. A motion mechanism is provided in the spindle hub of the rotary drive device, the moving direction of the linear motion section is set in the radial direction of the spindle hub, and the drive pin is provided in the linear motion section of the linear motion mechanism. A rotating drive device for magnetic disks.