JPH0474793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk drive device that utilizes an ejector body to press and seat a cassette containing magnetic disks on a chassis.

[Conventional technology]

As this kind of magnetic disk drive device, there are Japanese Utility Model Application Publication No. 60-20054, Japanese Utility Model Application No. 59-121756, and Japanese Patent Application Publication No. 60-1999.
As shown in No. 38753, etc., two pins are provided on each side of the cassette storage body, and an inclined part provided in the eject body is used to move the pins up and down inside the guide part made of elongated holes and notched grooves provided in the chassis. A configuration has been known in which a cassette storage body containing a cassette is moved up and down by moving the cassette, and the cassette is pressed against the chassis.

[Problem to be solved by the invention]

In the above conventional example, when the cassette is pressed against the chassis, due to variations in the dimensions of the four pins provided on the cassette storage body, the four sloped portions provided on the eject body, and the four guide portions provided on the chassis, 4
A gap occurs between the pin of the book and one of the four slanted sections, and the cassette storage body moves slightly due to the gap, and the cassette is not seated stably on the chassis, resulting in a magnetic field. This has the disadvantage that the contact between the head and the magnetic disk becomes unstable. In order to solve this drawback, a method can be considered to improve the accuracy of each dimension and assembly dimension of parts such as the eject body, cassette storage body, chassis, etc., in order to minimize the above-mentioned distance. This has the disadvantage that productivity is significantly reduced.

SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a magnetic disk drive device that can stably seat a cassette storage unit on a chassis and stabilize contact between a magnetic head and a magnetic disk without deteriorating productivity. is to provide.

[Means to solve the problem]

The above purpose is to provide a chassis, a front panel attached to the front of the chassis, a cassette storage body mounted on the chassis, a cassette storage body inserted into the cassette storage opening of the front panel, and a magnetic disk storage device. a magnetic head provided on the chassis at a position away from the front panel; an eject body attached to the chassis; and when the eject body is pushed toward the rear of the chassis, a lock mechanism that holds the pressed state and releases this held state by pushing the cassette into the cassette storage body; and when the held state is released, the eject body moves toward the front panel side. A biasing means for biasing the eject body in the direction of the front panel, a pin provided at the front and rear of both sides of the cassette storage body, and a vertical movement of the pin on the chassis surface at all times. a guide portion that restricts the eject body in a direction, and when the eject body is pushed toward the rear of the chassis, the pin is guided by the guide portion in a direction away from the chassis surface, and is pushed into the cassette storage body. an inclined groove that moves the pin toward the chassis surface while being guided by the guide portion; and an inclined groove that moves the pin away from the chassis surface when the eject body is pushed toward the rear of the chassis. In a magnetic disk drive device, when the cassette is pushed into the cassette storage body, the pins on the magnetic head side of the pins provided at the front and back of both sides of the cassette storage body This is achieved by causing the pin to come into contact with the upper slope of the sloped groove earlier than the pin on the front panel side and fall through the guide part, thereby pressing the cassette storage body into the chassis. .

[Effect]

When the cassette is pushed into the cassette housing through the cassette housing opening, the lock mechanism and the ejector body are disengaged and the ejector body moves toward the front panel. As a result of this movement, the cassette storage body causes the pin provided on the cassette storage body to fall into the guide portion provided on the chassis by the inclined groove provided on the eject body, and the cassette storage body is seated on the chassis surface. . In this case, the pins on the magnetic head side on both sides of the cassette storage unit fall down the guide provided on the chassis faster than the pins on the front panel side of both sides of the cassette storage unit, and the cassette storage unit is pressed against the chassis and is seated. Therefore, the magnetic head and the magnetic disk are brought into contact with each other reliably, and signals are exchanged accurately between the magnetic disk and the magnetic head.

All you need to do is make the pins on the magnetic head side on both sides of the cassette storage body so that they fall through the guide provided on the chassis faster than the pins on the front panel side on both sides of the cassette storage body. The dimensions of parts such as the cassette storage body and the dimensions of the assembly may be within normal general tolerance ranges, improving productivity.

〔Example〕

Embodiments of a magnetic disk drive device according to the present invention will be described with reference to the drawings.

In the drawings, 1 is a magnetic disk, 2 is a cassette, 3 is a cassette storage body, 4 is a hub having a guide groove 5, and 7 is a hub holder provided with a guide body 6.

8 is a chassis to which each part of the device is attached; 9 is a boss formed integrally with the chassis 8; on the inner diameter side of this boss 9 is a magnetic disk 1 built in the cassette 2; A housing 11 is attached which supports a drive device 10 for rotating the .

A shaft 12 directly connected to the drive device 10 is provided with a hub receiver 7 on which a hub 4 provided at the center of the magnetic disk 1 is placed. The magnetic disk 1 is fixed to the hub 4, and is configured to be mounted on the tip of the shaft 12 and centered.

The cassette storage body 3 into which the cassette 2 has been inserted is configured to be able to move up and down through a guide portion 13 (Fig. 1) consisting of a long hole provided on the side of the chassis 8. A bent projection 14 is formed in the center of the magnetic disk 1, and a leaf spring 16 for applying an appropriate load to the hub 4 at the center of the magnetic disk 1 via a collet 15 is crimped using the bent projection 14 as a guide. Alternatively, it is fixed to the cassette storage body 3 by welding.

Further, as detailed in FIG. 8, a collet support 17 is provided on the upper part of the leaf spring 16.
The collet 15 is attached to one end of the collet support 17, and at the same time, the end 19 of the leaf spring 16 is hooked to the leaf spring hook portion 18 provided near the collet support 17.
The cassette storage body 3 is supported by inserting a slit 20 provided at a position corresponding to the bending projection 14 into the bending projection 14.

Therefore, since the load acting on the collet 15 of the leaf spring 16 acts on the leaf spring hooking portion 18 near the collet 15, the spring constant of the leaf spring 16 can be reduced, so that the pressing force applied to the collet 15 is reduced. can be made constant.

The other end of the collet support 17 is connected to the cassette insertion slot 2 on the back side of the front panel 21 attached to the front of the device.
2, and is supported by the support part 23 and the slit 20 inserted into the bending protrusion 14.

Furthermore, in such a configuration, when the cassette 2 shown in FIG. 1 is not inserted, the cassette storage body 3 is lifted up by the eject plate 24 as shown in FIG. The front end of the collet 15 is in contact with the support part 23 of the front panel 21, and the collet 15 attached to the tip of the collet support 17 uses the slit 20 as a fulcrum and resists the spring force of the leaf spring 16 attached to the cassette storage body 3. It is something that can be lifted up.

And when this was lifted up, collect 1
5 is set such that its lower surface is raised above the upper surface of the cassette storage body 3.

Therefore, even if the height dimension of the cassette storage body 3 is set to be approximately the same as the thickness of the cassette 2 on the inside, the cassette 2 will not come into contact with the collet 14 when inserted.

Next, as shown in FIG. 2, when the cassette 2 is inserted into the cassette storage body 3, the ejector body 24 is unlocked by the locking mechanism 53 and the cassette storage body is inserted, as shown in FIG. 3 falls downward, and at the same time the hub 4 of the magnetic disk 1 is attached to the hub holder 7, the front end of the collet support 17 separates from the support part 23 of the front panel 21, so that it is lifted up using the slit 20 as a fulcrum. collection 15
is pressed against the hub 4 side by the leaf spring 16, and presses the hub 4 of the magnetic disk 1 against the hub receiver 7.

Further, as shown in detail in FIG. 6, the front panel 21
Mounting holes 26 are provided on both sides for mounting a door 25 for blocking the cassette insertion slot 22 when the device is not in use, and a door spring 27 for giving elasticity to the door 25 is integrated into the door 25. The door 25 is inserted through an insertion shaft 28 which is formed in the same manner as shown in FIG.

Reference numeral 29 denotes a spring hook portion for preventing the door spring 27 from coming off.

Furthermore, the front panel 21 is hooked onto the cutout portions 31 of the side plates 30 integrally formed on the chassis 8.
Holding portions 32 for holding are integrally formed on both side surfaces.

According to such a front panel configuration, only the door 25 and the door spring 27 are required, and the number of parts is reduced compared to the conventional door structure, resulting in an inexpensive configuration. be. Furthermore, since the cassette insertion slot 22 is closed with a single door 25, the design is excellent.

On the other hand, 33 is a carriage, and 33 is a carriage.
A lower magnetic head 34 for writing and reading data on the magnetic disk 1 is provided at the tip of the magnetic disk 3.

The upper magnetic head 3 is used to write and read data on both sides of the magnetic disk 1 by inserting the cassette 2 once.
5 is provided at the tip of the head arm 36.

Normally, the center of the read and write cores between the lower magnetic head 34 and the upper magnetic head 35 is
100TPi (100 track density per inch)
In this case, the position is shifted by 8 tracks.

Reference numeral 37 denotes a head arm spring for applying an appropriate load when the upper magnetic head 35 comes into close contact with the magnetic disk 1.

The carriage 33 and head arm 36 configured as described above are configured to be moved along a concentric recording band formed on the magnetic disk 1 via a steel belt 40 attached to a pulley 39 of a stepping motor 38. ing.

Reference numeral 41 denotes a mounting screw for the steel belt 40 to the pulley 39, and the tip of the mounting screw 41 is connected to the carriage 33 from the location located at the outermost track and the innermost track recorded on the magnetic disk 1. It is made to hit the stopper 42 so as not to deviate more than the track.

This is detected by the outermost track detection sensor 43 during normal use, but if it moves more than two tracks from the outermost track in the outer circumferential direction during transportation, etc., due to the characteristics of the stepping motor 38, the outermost track is detected. This is because there is a risk that you will not be able to move. In addition, the stepping motor 3
This is to prevent the steel belt 40 from being cut if the belt 8 goes out of control due to some influence.

44 is a locking protrusion formed integrally with the chassis 8 and passing through the eject plate 24.

The ejection plate 24 has a locking protrusion 44.
Bent portions 46 for locking return springs 45, which serve as biasing means, are provided on both sides.

As shown in detail in FIG. 7, the above-mentioned return spring 45
The substantially central portion is bent to a curvature that substantially matches the diameter of the locking protrusion 44, and an arbitrary curvature 47 is given to both sides thereof to smoothly connect the central curved portion 48. Further, an arm 49 of an appropriate length is extended outside the curvature 47.

The return spring 45 having such a shape is made of an elastic wire or the like.
The central curvature portion 48 snaps onto (or locks) the locking protrusion 44 . Moreover, the upper portion thereof is held down by a retaining portion 50 formed integrally with the chassis 8. Thereafter, the arm 49 is locked to a bent portion 46 provided on the eject plate 24, and in this locked state, the eject plate 24
is biased toward the front panel 21 side.

As shown in FIGS. 3 and 6, the eject plate 24 includes a lock protrusion 51, a horizontal portion 24a,
It has an inclined groove 52 consisting of upper inclined parts 24b, 24c and lower inclined part 24d, and when the cassette 2 is not inserted or is being inserted, the lock protrusion 51 is locked as shown in FIG. It is locked by a mechanism 53, and the horizontal portion 24a of the inclined groove 52 lifts a pin 54 on which the cassette storage body 3 is installed.

When the cassette 2 is not inserted into the magnetic disk drive device having such a configuration, the state shown in FIG. 1 is established as described above.

At this time, the state of the return spring 45 is from the no-load state A shown in FIG. 7 to the state C in which it is given maximum deflection. The lock protrusion 51 is locked by a lock mechanism 53, and the horizontal portion 2 of the eject plate 24
4a pushes up the pin 54.

Next, when the cassette 2 is inserted into the cassette storage body 3, the ejection plate 24 slides toward the front panel 21 by the restoring force of the return spring 45, since the locking mechanism 53 is unlocked by the cassette 2. At the same time, the inclined groove 52 also moves in the direction of the arrow P in FIG. It is configured to be pressed downward by the inclined portion 24b.

Further, the operations shown in FIGS. 4 and 5 will be explained in detail below.

As described above, the pin 54 provided on the side surface of the cassette storage body 3 is initially supported on the horizontal portion 24a of the eject plate 24.

When the lock mechanism 53 is released by inserting the cassette 2 into the cassette storage body 3, the eject plate 24 slides toward the front panel 21 due to the restoring force of the return spring 45.

As a result, the pin 54 comes off the horizontal part 24a of the eject plate 24, and the upper inclined part 24 of the inclined groove 52
4b, the guide portion 13 provided on the side surface of the chassis 8 falls in the vertical direction.

Therefore, the cassette 2 provided on the chassis 8
It can be smoothly inserted into the guide pin 55 for positioning.

Even if the cassette 2 is completely seated on the chassis 8, the eject plate 24 tends to move toward the front panel 21 due to the restoring force of the return spring 45.
4 and always applies a component force to the pin 54 in the vertical R direction shown in the figure, so that the cassette 2 can be stably mounted and seated on the chassis 8 via the cassette storage body 3.

Among these series of operations, magnetic disk 1
is pressed against the hub receiver 7.

The state in which the magnetic disk 1 is pressed against the hub receiver 7 is as shown in FIG. 2, and the return spring 45
As shown in FIG. 7, is in state B where it is slightly deflected compared to when it is not deflected.

The eject plate 24 has upper inclined portions 24a and 24c.
has. As shown in FIG. 9, the upper inclined part 24b is set to be slightly moved rearward in parallel by a distance Δt than the upper inclined part 24c. The dimension Δt is set to a value such that even if the tolerances of each part are integrated, the pin 54 contacts the upper inclined portion 24c first, and contacts the upper inclined portion 24b later. The return spring 45 always urges the eject plate 24 toward the front panel 21 side. 8a
is a seating surface formed integrally with the chassis 8. The seating surfaces 8a are located at two locations on the left and right near the head of the chassis 8, and at two locations on the left and right on the front panel 21 side.
There are a total of 4 locations.

When the cassette 2 is not inserted into the magnetic disk drive device constructed in this manner, the state shown in FIG. 10 is reached. At this time, the state of the return spring 45 is state C, where it is given maximum deflection.

Next, when the cassette 2 is inserted into the cassette storage body 3, the lock mechanism 53 is released by the cassette 2, and the eject plate 12 is moved toward the front panel 21 by the restoring force of the return spring 45. At the same time, the upper inclined portions 24b and 24c also move in the direction of arrow P.
As shown in FIG. 11, the pin 54 is separated from the horizontal portion 24a of the eject plate 24 and is pressed downward by the upper inclined portion 24c, and falls into the guide portion 13. The cassette 2 is attached to the seating surface 8 via the cassette storage body 3.
However, since it is the upper inclined portion 24c that comes into contact with the pin 54, the pressing force on the cassette 2 in the vicinity of the upper inclined portion 24b is small. In other words, the pressing force of the cassette 2 near the upper and lower magnetic heads 34, 35 is greater than that near the front panel 21. This makes it possible to eliminate incomplete seating of the cassette 2 in the vicinity of the upper and lower magnetic heads 34, 35, and enables accurate signal transmission and reception.

12 and 13 show the width L of the guide portion 13 in the direction of the front panel 21 of the chassis 8, as in other embodiments.
The same effect can be obtained even if the width l is set wider than the width l of the guide portion 13a on the side of the magnetic heads 34 and 35. In this case, the parallel displacement dimension Δt of the eject plate 24 may be set to zero. In other words, the front and rear positions of the cassette storage body 3 are determined by the magnetic heads 34, 3.
This will be determined only by the guide section 13a on the 5 side. Naturally, since the cassette storage body 3 is pressed down by only the upper inclined portion 24c and the guide portion 13a on the magnetic heads 34, 35 side, the cassette 2 is surely pressed on the magnetic heads 34, 35 side.

〔Effect of the invention〕

According to the present invention, when a cassette is pushed into the cassette storage body, among the pins provided at the front and rear of both sides of the cassette storage body, the pins on the magnetic head side fall into the guide portion earlier than the pins on the front panel side. As a result, the cassette storage body is pressed and seated on the chassis, so that the cassette storage body can be stably seated on the chassis without deteriorating productivity, and the contact between the magnetic head and the magnetic disk can be stabilized. It can be grown.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic disk drive device according to an embodiment of the present invention when the cassette is not inserted, FIG. 2 is a sectional view of the magnetic disk drive device when the cassette is inserted, and FIG. 4 and 5 are enlarged detailed views of the main parts, FIG. 6 is an exploded perspective view of the front panel, FIG. 7 is a detailed explanatory view of the return spring, and FIG.
The figure is an exploded perspective view of the main parts, FIG. 9 is a diagram explaining the principle, FIGS. 10 and 11 are diagrams explaining the principle of one embodiment of the present invention, and FIGS. 12 and 13 are diagrams showing other embodiments FIG. 1...magnetic disk, 2...cassette, 3...
Cassette storage body, 8... Chassis, 13, 13a
. . . Guide portion, 21 . . . Front panel, 22 . Upper magnetic head, 4
5...Biasing means (return spring), 52...Slanted groove,
53...Lock mechanism, 54...Pin.

Claims (1)

[Scope of Claims] 1. A chassis 8, a front panel 21 attached to the front of the chassis 8, a cassette storage body 3 mounted on the chassis 8, and a cassette storage opening 22 of the front panel 21. A cassette 2 into which the storage body 3 is inserted and which stores the magnetic disk 1, and magnetic heads 34, 3 provided on the chassis 8 at a position away from the front panel 21.
5, and an eject body 2 attached to the chassis 8.
4, when this eject body 24 is pushed toward the rear of the chassis 8, the pressed state is maintained, and this held state is maintained when the eject body 24 is pushed toward the rear of the chassis 8.
a lock mechanism 53 that is released by pushing the cassette 2 inward; and a lock mechanism 53 that moves the eject body 24 in the direction of the front panel so that the eject body 24 moves toward the front panel 21 when the holding state is released. a biasing means 45 that biases the cassette storage body 3, a pin 54 provided at the front and rear of both sides of the cassette storage body 3, and a guide that always restricts the vertical movement of the pin 54 on the chassis 8 surface in the vertical direction. 13 and the guide portion 13 when the eject body 24 is pushed toward the rear of the chassis 8.
When the cassette 2 is pushed into the cassette storage body 3, the pin 54 is guided by the guide portion 13 and moved away from the chassis 8 surface.
a horizontal portion 24 that maintains the state in which the pin 54 moves away from the surface of the chassis 8 when the eject body 24 is pushed toward the rear of the chassis 8;
d, when the cassette 2 is pushed into the cassette housing 3, the magnetic head 34,
35 side to the upper inclined part 24c of the inclined groove 52 earlier than the pin 54 on the front panel 21 side.
A magnetic disk drive device characterized in that the cassette storage body 3 is pressed and seated on the chassis 8 by causing the cassette storage body 3 to come into contact with the chassis 8 and fall through the guide portion 13.