JPH0132199Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a chuck device for mounting a floppy desk to a drive device for a floppy desk used as an external storage device for a computer or the like.

[Prior art]

Figure 1a is a cross-sectional view of the main parts showing the structure of the chuck device that attracts the turntable and the desk of the microfloppy disk drive device, in which 1 is the stator of the drive motor, 2 is the rotor yoke, and 3 is the rotation of the turntable. A magnet attached to the child yoke 2, 6 indicates a rotating spindle of the rotor yoke 2, and this type of chuck device integrally fixes a floppy disk suction turntable 4 with a suction magnet 5 attached to the spindle 6, As shown in FIG. 1b, a plate spring 7 whose one end 7-1 is fixed to the rotor yoke 2 is disposed below the turntable 4, and its center hole 7
-2 to the spindle 6, and the other end 7 of the leaf spring 7.
A rotating body 10 rotatably attached to a short shaft 9 implanted in a tongue 7-4 provided on the turntable 4
The hub 12 of the floppy desk 11 protrudes onto the turntable through a hole 4-1 provided through the floppy disk 11.
At this time, the hub 12 is pushed in the radial direction by the rotating body 10, and two sides of the square hole of the center hole 13 of the hub 12 are engaged with the drive hole 14 provided in the spindle 6.
As a result, the floppy disk 11 is configured to rotate integrally with the turntable 4.

The process from when the floppy disk 11 is mounted on the chuck device until it rotates integrally with the turntable 4 provided on the spindle 6 of the drive motor will be explained with reference to FIGS. 2a and 4b to 4a and 4b.

In the situations shown in Figure 2 a and b, the floppy desk 11
The hub 12 of is attracted to the magnet 5 provided on the turntable 4, but since the rotating body 10 disposed on the leaf spring 7 is not in a position that coincides with the drive hole 14 provided in the hub 12, the rotation does not occur. The head of the body 10 is pressed by the lower surface of the hub 12, and the other end 7-3 of the leaf spring 7
The tongue portion 7-4 extending toward the center is bent, and the center line of the rotating body 10 is inclined, and the outer corner of the head of the rotating body 10 is in contact with the hub 12. In this state, the rotating body 10 is rotated together with the turntable. Rotate clockwise.

Since the rotating body 10 rotates about the short axis 9, the friction between the rotating body 10 and the hub 12 is extremely small, and in this state, the floppy disk 11 remains stationary. Further, since the center hole 13 of the hub 12 is a rectangular hole slightly larger than the outer diameter of the spindle 6, there is a gap between the hub 12 and the spindle 6 in the radial direction.

Next, as the turntable 4 continues to rotate, the states shown in FIGS. Fits into hole 14.

As the turntable continues to rotate further, Figure 4 a and b
When the state is reached, the rotating body 10 reaches the end of the driving hole 14 of the hub 12 and starts driving the hub 12. At this time, the rotating body 10 pushes the hub 12 outward in the radial direction so that the two sides of the square hole of the center hole 13 of the hub 12 sandwich the spindle 6, so that the center of the floppy disk 11 and the center of the spindle 6 are approximately aligned. The rotary body 10 contacts the end of the driving hole 14 of the hub 12 and drives the hub 12, so the positional relationship in the rotational direction between the turntable 4 and the floppy disk 11 is always constant. The index pulse for determining the starting point of the recording track on the floppy disk 11 can be generated by a pulse generator mounted on the turntable 4 or the rotor of an electric motor and used.

However, in the conventional device as described above, the drive pin 1
The source of the force that pushes the hub 12 outward in the radial direction is due to the slight radial movement of the drive pin when the tongue 7-4 of the leaf spring 7 recovers from its deflection, pushing the hub 12 in the radial direction. There were problems such as the strength was weak, skill was required to adjust the angle at which the leaf spring was bent, and quality was difficult to maintain.

[Purpose of invention]

The purpose of the present invention is to solve the problems of the prior art as described above, and to provide a chuck device that can securely move the drive pin in the radial direction, hold the floppy disk correctly at the center of the spindle, and drive it reliably. It is in.

[Summary of the idea]

The floppy desk chuck device of this invention is
A drive pin that protrudes from the top surface of the turntable through a through hole provided in the turntable on which the floppy disk is placed and engages with a drive hole of the floppy disk is inserted between the center of the through hole and the It is planted on one side of a right-angled arm that is rotatably supported by a fulcrum pin provided on the underside of the turntable at a position away from the line connecting the centers of the turntable drive spindles, and rotates around the fulcrum pin. The turning locus of the drive pin intersects the line connecting the center of the spindle and the center of the through hole at a point that has turned very slightly, and there is a gap between the tip of the other side of the right-angled arm and the bottom surface of the turntable. The long side of the arm is restrained to the center of the spindle by the tension of the stretched coil spring, and the driving pin installed on the short side of the arm is moved toward the outer circumference of the turntable.

[Structure of the idea]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 5a to 5c, the drive pin 23 is provided on the underside of the turntable 4 at a position perpendicularly away from the line connecting the approximate center of the through hole and the center of the spindle. A through hole is implanted at the tip of the short side of the right-angled arm 24 supported by a fulcrum pin 25, and the drive pin 23 is provided on the floppy desk mounting side (upper side) from the lower side near the outer periphery of the turntable 4. The rotation locus of the drive pin 23 provided at the tip of the arm 24 that protrudes through the floppy disk 4-1 and merges with the drive hole of the floppy disk and rotates around the fulcrum pin 25 is the spindle 6.
The long side 24- of the arm is arranged so as to intersect the line connecting the center of the through hole 4-1 with the center of the through-hole 4-1 at a point that has turned very slightly, and extends in a substantially perpendicular direction from near the fulcrum 25 of the arm 24. A coil spring 27 is stretched between the tip of the arm 24 and a fixing pin 26 provided on the bottom surface of the turntable 4 at a substantially symmetrical position via the fulcrum pin and the center of the spindle, and the tension of the coil spring 27 causes the arm 24 to The driving pin 23 installed at the tip of the short side of the disk is pushed radially outward within the through hole 4-1, and the hub 12 is pushed radially to properly chuck the floppy disk 11 to the center of the spindle 6. do.

[Effect of idea]

Since the device of the present invention has the above-described configuration, when the drive pin 23 is engaged with the drive hole 14 provided in the hub 12 of the floppy disk 11, the drive pin 2
The floppy disk 11 is pushed in the radial direction by the radial pressing force of 3, the two sides of the square hole of the center hole 13 are pressed against the spindle 6, and the rotational force is applied to the drive pin 2.
3 is transmitted by contacting the side of the drive hole 14 of the hub 12, and at this time, the drive pin 23 is planted on the short side of the arm 24, so even if rotational force is applied, it will not move in the rotation direction. First, the floppy disk 11 is always driven at a constant rotational position relative to the turntable 4.

[Brief explanation of drawings]

FIG. 1a is a sectional view showing a conventional chuck device and drive motor, and FIG. 1b is a plan view of the leaf spring.
FIG. 1c is a side view thereof, FIGS. 2a, b to 4a, b are explanatory cross-sectional views and plan views showing the progress of rotation of the floppy disk, and FIG. 5a is a chuck device of the present invention. FIG. 5b is a side view, and FIG. 5c is a bottom view. DESCRIPTION OF SYMBOLS 1... Stator, 2... Rotor yoke, 3... Magnet, 4... Turntable, 4-1... Through hole, 5... Adsorption magnet, 6... Spindle, 7... Leaf spring, 7-1...One end, 7-2...
Center hole, 7-3...other end, 7-4...tongue, 9...
... Short axis, 10 ... Rotating body, 11 ... Floppy desk, 12 ... Hub, 13 ... Center hole, 14 ...
Hole, 23... Drive pin, 24... Arm, 24-
1...long side, 25...fulcrum pin, 26...fixing pin, 27...coil spring.

Claims (1)

[Scope of utility model registration request] A drive pin that protrudes from the top surface of the turntable through a through hole provided in the turntable on which the floppy disk is placed and engages with a drive hole of the floppy disk is inserted between the center of the through hole and the It is planted on one side of a right-angled arm that is rotatably supported by a fulcrum pin provided on the underside of the turntable at a position away from the line connecting the centers of the turntable drive spindles, and rotates around the fulcrum pin. The turning locus of the drive pin intersects the line connecting the center of the spindle and the center of the through hole at a point that has turned very slightly, and there is a gap between the tip of the other side of the right-angled arm and the bottom surface of the turntable. The floor is characterized in that the long side of the arm is held at the center of the spindle by the tension of a stretched coil spring, and a drive pin installed on the short side of the arm is moved toward the outer circumference of the turntable. Tupeedesk chuck device.