JPH036593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magnetic disk device, and more particularly, it protects data on a magnetic disk during magnetic recording and reproduction and data sent from the magnetic disk device from destruction due to erroneous operation, and at the same time protects data from being destroyed due to erroneous operation of a magnetic head. This invention relates to a magnetic disk device equipped with a safety mechanism that can protect it from mechanical destruction caused by.

PRIOR TECHNOLOGY Conventionally, it has been possible to accidentally operate a magnetic disk device during magnetic recording and reproduction, unloading the recording and reproduction head during recording and reproduction, and destroying the data on the magnetic disk.
Various safety devices have been proposed to prevent the interruption of transmitted data and the suspension of operation of the host system.

For example, a door may be provided at the insertion slot for a magnetic disk, and a latch may be provided to artificially lock the door to prevent the door from being opened inadvertently, or a detection means such as a micro switch may be used to detect the opening and closing of the door. A structure has been proposed in which the holding mechanism of the magnetic disk holding means is locked by a locking mechanism linked to a head load solenoid.

However, when manually locking the door, it is completely useless if you forget to latch it, and the electrical interlock system only stops the recording and reproducing operation, and is a safety measure to protect the recording and reproducing operation from erroneous operation. It can not be said.

Furthermore, when a locking mechanism linked to a head load solenoid is employed as the protection mechanism for the magnetic disk clamping means, the clamping means and the protection mechanism are constructed as separate members. Therefore, even if the head is loaded due to an operational failure of the clamping means or holding means, the clamping means can be released, and the magnetic head, which is the most important component of a magnetic disk drive, can be ejected. The disadvantage was that the magnetic disk could be destroyed by the magnetic disk.

Another disadvantage is that the means for inhibiting the lowering of the magnetic head when inserting or ejecting a magnetic disk is a separate member, complicating the overall mechanism.

Purpose: The present invention has been made to eliminate the above-mentioned drawbacks of the conventional disk drive.When the magnetic head is lowered, the magnetic disk holding means is prohibited from being released, and when the holding means is released, the holding means for the magnetic disk is prohibited from being released. It is an object of the present invention to provide a magnetic disk device configured to prevent data destruction and mechanical destruction of the magnetic head by prohibiting the operation of a means for raising and lowering the magnetic head.

Embodiments Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

First Embodiment FIGS. 1 to 3 show an embodiment of the present invention. In the figures, the reference numeral 1 indicates a frame of the device, and a front panel 2 is provided on the front side of this frame 1. The front panel 2 has a magnetic disk insertion slot formed therein.

Further, the reference numeral 3 indicates a magnetic disk, and the magnetic disk 3 is composed of an exterior body 3a made of cardboard or the like and a magnetic disk sheet 3b.

A center cone 5 serving as one of the means for holding the magnetic disk 3 is disposed above the top plate 4 of the frame 1. This center cone 5 is attached to the tip of the support arm 6.
The other end is rotatably supported via a shaft 7 on bearing members 9a and 9b provided on the top plate 4.

Further, a spring 8 is stretched between the end of the support arm 6 on the shaft 7 side and a support plate 9c protruding from the top plate 4, and the center cone 5 is lowered relative to the support arm 6. It gives a habit of turning in the direction of

Further, the reference numeral 10 designates a head arm, and a magnetic head (not shown) is provided on the lower surface of the head arm, and is always given the habit of rotating toward the magnetic disk by a spring (not shown).

A head load arm 11 is provided in the vicinity of the head arm 10, as shown in FIG. 10a
It is located below.

The other end of the head load arm 11 is fixed to a support member 13 on the top plate 4 via a leaf spring 12. A solenoid 14 is provided below the middle of the head load arm 11, and when the solenoid 14 is energized, the head load arm 11 is sucked downward. Further, the head load arm 10 is given elasticity by a leaf spring 12 so that its free end always points upward.

Incidentally, a slide plate 15 is provided on the top plate 4 in a state perpendicular to the support arm 6. A spring 16 is stretched between a protrusion 15e protruding from the side in the middle of the slide plate 15 and a protrusion 17 provided on the top plate at a position closer to the front panel 2. 1 to the left in FIG. 1 with respect to the slide plate 15, that is, the front panel 2
It gives them the habit of moving to the side.

This slide plate 15 has elongated holes 15a formed at its tip and front side, and pins 22 and 23 are slidably fitted into these elongated holes 15a, respectively. The pins 22 and 23 are provided in a protruding manner on the top plate 4.

A latch 18 is rotatably supported on one pin 22, and a pin 19 projects from the slide plate 15 near the latch 18.

A torsion spring 20 is wound around the pin 22 on the upper side of the latch 18. One end of the torsion spring 20 is engaged with a protrusion 21 protruding from the top plate, and the other end is attached to the latch 1.
It is engaged with the protruding piece 18a on 8.

This torsion spring 20 causes the latch 1
8 is given a counterclockwise rotational habit in FIG. 2A.

Projecting pieces 15b and 15c are provided on the side surface of the slide plate 15 at positions corresponding to the projecting pieces 11a formed on the free end side of the head load arm 11.

Further, a cam piece 15d is protruded from the side edge in the middle of the slide plate 15, and this cam piece 15d is located on the support arm 6 side and is always in contact with the support arm 6. The support arm 6 can be moved up and down by moving 15d.

A push button 24 is fixed to a portion of the slide plate 15 that protrudes from the front panel 2.

As is clear from FIG. 2B, a presser member 11b made of an elastic member is fixed to the lower surface of the free end of the head load arm 11.

Next, the operation of this embodiment configured as above will be explained.

First, when the magnetic disk 3 is inserted through a magnetic disk insertion slot (not shown) formed on the front panel 2 side and the push button 24 is pressed, the slide plate 15 is moved to the right in FIG.

Then, the cam piece 15d also moves forward, so that the center cone, which has been located above, is moved to the support arm 6.
At the same time, it comes down and grips the magnetic disk 3.

As the slide plate 15 moves forward, the pin 19 comes into contact with the inclined side edge of the latch 18, so that the latch 18 is rotated clockwise as shown in FIG. 2A.

When the slide plate 15 moves further forward, the pin 19 fits into the notch 18b of the latch 18, and the third
As shown in Figure A, the pin 19 is engaged in the notch 18b, and the slide plate 15 is locked.

In this state, the solenoid 14 is energized, and the head load arm 1 is activated to perform magnetic recording and reproduction.
1 is lowered, as shown in FIG.
Located in the space between 5b and 15c, the slide plate 1
5 is held so that it cannot be moved completely.

In this state, even if the slide plate 15 is pushed via the push button 24, the slide plate 15 will not move.

When the head load arm 11 is lowered, the protrusion 18
The head arm 11, which is in an interlocking relationship via a, also lowers, and the magnetic head h comes into contact with the magnetic disk.

This state is shown in FIGS. 3A and 3B. Note that before the slide plate 15 is moved forward by pressing the push button 24, the solenoid 14
Even when energized, the protrusion 11a at the tip of the head load arm 11 does not touch the protrusion 15c of the slide plate 15.
Since it is located above, the head load arm 11 cannot be lowered, and therefore the head arm 10 cannot be lowered either, so that the magnetic head does not come into contact with the magnetic disk or the like.

Furthermore, even if the head load mechanism or the latch mechanism of the slide plate 15 malfunctions, if the head load arm 11 is lowered, the protrusion 11a at the tip of the head load arm 11 will be moved to the protrusions 15b, 15c of the slide plate 15. The slide plate 15 cannot be moved because it is inserted into the magnetic disk 3.
It is impossible to extract it. In this way, the magnetic head is completely protected from mechanical damage and, of course, no data is destroyed.

Second Embodiment On the other hand, FIGS. 4 to 7 explain other embodiments of the present invention, and in each figure, the same or corresponding parts as in FIGS. 1 to 3 are given the same reference numerals. However, the explanation thereof will be omitted.

In this embodiment, a spring 33 is loaded between the support arm 6 and the top plate 4, giving the support arm 6 the ability to constantly rotate upward.

Further, as is clear from FIG. 4, a shaft 31 is rotatably supported on the top plate 4 by bearing members 32a and 32b in a state perpendicular to the support arm 6, and this shaft 31 protrudes from the panel 2. A lever 30 is fixed to the opposite end.

Further, a cam 31a is fixed in the middle of the shaft 31 above the support arm 6, and a lever 30
A cam 31b is fixed near the opposite end.

The free end side of the head load arm 11 is guided in a vertically movable manner by a guide pin 34 provided protrudingly on the upper surface plate 4, and a protrusion 11c formed at a position approximately corresponding to this pin 34 is connected to the cam. 31b.

Further, the reference numeral 35 denotes a rotationally driving spindle located below the magnetic disk 3 in correspondence with the center cone 5.

Next, the operation of this embodiment configured as above will be explained.

First, in the initial state shown in FIG. 4, the magnetic disk 3 is inserted from the magnetic disk insertion opening side of the front panel 2, and the lever 30 is turned, for example, by a quarter turn. Then, the cam 31a, which had been in a state almost parallel to the support arm 6 as shown in FIG. It is almost perpendicular to. As a result, the support arm 6 is lowered by the cam 31a by bending the spring 33, and the cam 31b is separated from the projection 11c of the head load arm 11, so that the head load arm 11 becomes free.

As a result, the center cone 5 descends and clamps the magnetic disk 3 between it and the spindle 35. In this state, solenoid 1 is used for magnetic recording and reproducing.
When the magnetic head 4 is energized, the head load arm 11 is lowered as shown in FIG. 7, and as a result, the head arm 10 is also lowered and the magnetic head h comes into contact with the magnetic disk 3 as shown in FIG.

On the other hand, even if an attempt is made to reversely rotate the lever 30 in this state to return to the initial state, the cam 31b will not move as shown in FIG.
1c, it cannot rotate, the support arm 6 does not open, and the center cone 5 does not separate from the magnetic disk 3. Of course, as shown in FIG. 5, in the initial state, the cam 31
Since the head load arm b is located below the projection 11c, the head load arm 11 cannot be lowered, and as a result, the head arm 10 cannot be lowered either, and the magnetic head h does not come into contact with the magnetic disk 3 side.

In this way, the magnetic head cannot be moved up and down while the head is being loaded, and the magnetic head is prevented from moving up and down when the center cone is not lowered, that is, when the magnetic disk is not clamped. Therefore, there is no possibility of data destruction or mechanical destruction of the magnetic head due to erroneous operation.

Effects As is clear from the above description, the present invention has means for holding the magnetic disk and means for raising and lowering the magnetic head, and when the magnetic disk is held and the magnetic head is lowered, The magnetic head elevating means prohibits the magnetic disk holding means from releasing the grip, and when the magnetic disk is released, the magnetic disk holding means prohibits the magnetic head elevating means from lowering the magnetic disk. Since the structure is such that data can be destroyed, there is no possibility of data destruction or mechanical destruction of the magnetic head.

[Brief explanation of drawings]

Figures 1 to 3 A and B illustrate one embodiment of the present invention, with Figure 1 being a plan view, Figures 2 A and B being a plan view and longitudinal sectional side view of the main parts, and Figure 3 A , B are plan views and vertical side views of essential parts for explaining the operating state, and FIGS. 4 to 7 are for explaining other embodiments of the present invention. FIG. 4 is a plan view, and FIGS. FIG. 7 is a longitudinal side view illustrating the operation. 1...Frame, 2...Front panel, 3...Magnetic disk, 4...Top plate, 5...Center cone, 6
...Support arm, 10...Head arm, 11...Head load arm, 14...Solenoid, 15...Slide plate, 18...Latch, 19...Pin, 20...Torsion spring, 24...Push button, 30...Lever, 31...Shaft, 31a, 31b...cam, 33...spring.

Claims (1)

[Claims] 1.Equipped with a means for holding a magnetic disk and a means for raising and lowering a magnetic head, and when a magnetic disk is being held and the magnetic head is being lowered, the means for lifting and lowering the magnetic head is provided with a means for holding the magnetic disk. The clamping means for the magnetic disk is mechanically engaged with each other so that the releasing operation is prohibited, and when the clamping of the magnetic disk is released, the clamping means for the magnetic disk can inhibit the lowering operation of the elevating means for the magnetic head. A magnetic disk device characterized by: