JPH0610553Y2 - Floppy disk drive head load shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shock absorber for a floppy disk drive. In particular, the present invention relates to a shock absorber for controlling the descending speed of the head when the head is loaded onto the magnetic disk surface.

[Conventional technology]

Office equipments such as computers and word processors have been put to practical use in daily life, and in recent years, portable and small office equipments have been developed in many ways. Among them, the performance of floppy disk drives has been drastically improved in terms of higher density, higher speed, and smaller size. Generally, a floppy disk drive moves a cassette that rotatably stores a magnetic disk for recording information between a recording / reproducing position and an ejecting position, and works in conjunction with the cassette descending to the recording / reproducing position. The arm having the magnetic head mounted thereon is urged by the head load spring to press the magnetic head on the surface of the magnetic disk to record / reproduce information. At this time, if the descending speed at which the magnetic head is loaded onto the magnetic disk surface is too rapid, the data recording surface of the magnetic disk may be damaged and valuable data may be destroyed. Therefore, a shock absorber is used to control the descending speed of the magnetic head.

For example, in Japanese Unexamined Patent Publication No. 60-80184, the fact that the head loading is interlocked with the insertion / removal operation of the cassette is used to provide a rotary oil damper on the eject lever to buffer the movement of the eject lever. Is soft landed on the magnetic disk surface. However, in such an example, there is a problem in that the cassette insertion or ejection speed becomes slow although it is desired to be as fast as possible.

Further, in Japanese Patent Laid-Open No. 56-54668, head loading is performed by a biasing force of a solenoid, and unloading is a mechanism in which a solenoid is deenergized and a head arm is rotated by a spring in a direction away from a magnetic disk. It is disclosed to provide an air damper to control the speed of loading and unloading. However, the air damper had to increase the stroke of the cylinder, which was a major obstacle to miniaturization.

FIG. 5 shows a conventional example in which the damper is a rotary oil damper.

[Problems to be solved by the invention]

As described above, in the conventional floppy disk drive head load shock absorber, in order to indirectly control the descending speed of the head arm by controlling the movement of the eject lever that is linked to the movement of the head arm. However, there is a problem that the cassette inserting / removing operation cannot be arbitrarily determined regardless of the head descending speed. A head load spring for pressing the head onto the magnetic disk surface needs to have an appropriate spring constant in order to improve the dynamic followability of the magnetic head to the magnetic disk surface, but a damper is used. Therefore, there was a problem that the proper spring constant could not be selected due to its characteristics.

An object of the present invention is to provide a head load shock absorber for a floppy disk drive that can be mounted in a small space, controls only the movement of the head arm, and can appropriately select the spring constant of the head load spring with or without a damper. To do.

[Means for solving problems]

In order to achieve the above object, the present invention raises and lowers a magnetic disk between a recording / reproducing position and an ejecting position, and in conjunction with this movement, an arm equipped with a head moves up and down. In the head load shock absorber for controlling the falling speed of the base, a base, a rotary damper body fixed to the base, one end is rotatably supported by a rotary shaft provided on the base, and the other end is It is characterized by having a damper arm that engages with the arm and transmits the descending force of the arm to the damper body, and a spring for adjusting the descending speed of the arm.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a side view of a damper showing an embodiment of the present invention, and FIG. 2 is a plan view of FIG.

In the figure, the magnetic head 10 is attached to the tip of the damper arm 1.
When the arm 9 to which is attached is mounted, the damper arm 1 rotates clockwise around the shaft 8 integrally formed with the base 5.

Since the damper arm 1 and the actuators 2 and 3 have a link mechanism, the rotating force of the damper arm 1 is
The shaft 4 of the damper body 6 is rotated via the actuators 2 and 3.

The damper body 6 produces a resistance force due to the viscous resistance of the oil in the damper body 6 caused by the rotation of the shaft 4, and controls the rotation force of the damper arm 1. Damper arm 1
After the magnetic head 10 contacts the medium 11, the magnetic head 10 is separated from the arm 9 by the spring force of the spring 7 instead of the arm pressure. As shown in FIG. 2, a hook 12 is arranged on the damper arm 1 and the base 5, and a spring 7 is engaged with the hook 12 to regulate the thrust direction of the damper arm 1 with respect to the shaft 8. There is.

3 and 4 are an exploded perspective view showing a portion where the damper body of the present invention is mounted and a sectional view showing the mounted state.

The outer shape of the damper body 6 is not a circle but a part thereof is cut off.

Further, the base 5 is provided with a concave portion 1 to which a damper body 6 is closely attached and engaged.
A claw 14 is provided on the edge of the recess 3 and the recess 13. When the damper body 6 is fitted into the concave portion 13 of the base 5, the claw 14 engages with the convex portion of the damper body 6, and restricts the thrust direction with respect to the base 5.

The regulation in the radial direction is performed by the cut-out on the circumference of the damper body 6 and the fitting between the recess 13 of the base 5.

[Effect of device]

As is clear from the above description, according to the present invention, the mounting space can be reduced and the movement of the head arm can be directly controlled, so that the insertion / removal speed of the cassette can be arbitrarily determined regardless of the movement of the head arm. It has the effect that

In addition to the head load spring, by using a spring for adjusting the head load force that matches the characteristics of the damper, the spring constant of the head load spring can be optimally selected. This has the effect of making it possible to obtain a good recording / reproducing state by causing the head to follow the undulations sufficiently.

[Brief description of drawings]

FIG. 1 is a side view of a damper showing an embodiment of the present invention, and FIG.
1 is a plan view of FIG. 1, FIG. 3 is an exploded perspective view showing a mounting method of the damper body of the present invention, and FIG. 4 is a sectional view of the damper body of the present invention attached, and FIG. FIG. 6 is an exploded perspective view of a conventional example in which a damper body is attached to a base with screws. 1 ... Damper arm 2, 3 ... Actuator,
4, 8 ... Axis, 5, 15 ... Base, 6, 16 ... Damper body, 7 ... Spring, 9 ... Arm, 10 ... Magnetic head, 11 ... Media, 12 ... Hook, 13 ...... Concave part, 14 ...... claw, 17 ...... screw, 18 ...... ring.

Claims (1)

[Scope of utility model registration request] 1. A head load for raising and lowering a magnetic disk between a recording / reproducing position and an ejecting position, and an arm having a head performing the raising and lowering operation in conjunction with this operation, and controlling the descending speed at this time. In the shock absorber, a base, a rotary damper body fixed to the base, and one end rotatably supported by a rotary shaft provided on the base,
A head load shock absorber for a floppy disk drive, comprising: a damper arm having the other end engaged with the arm to transmit the descending force of the arm to a damper body; and a spring for urging the damper arm downward.