JPH065021A - Adjusting mechanism head loading/unloading - Google Patents

Abstract

PURPOSE:To reduce the dispersion of the landing position of a head and to increase the capacity of memories by providing a positioning part, which can be moved only in the head seeking direction in a cam in a mechanism for adjusting the loading/unloading of the head. CONSTITUTION:A positioning screw 50 for the side of a lower head is fixed with a positioning screw 52 for the side of an upper head without backlash under the state, where in a cam piece 48 for the lower head is not completely fixed. A positioning pin 56 for the upper and lower heads is coupled into the main body of a device. The pin 56 is slidably engaged with the corresponding notched parts for the cam pieces 48 and 46. Under the temporarily assembled state, at first, a lading-position adjusting jig 58 for the lower head cam piece is finely turned with a driver 54. The cam piece 48 is finely slid in only the head seeking directions, i.e., the right and left directions. A tapered surface 48a of the cam piece 48 is moved, and the landing position of the lower head is precisely adjusted. The cam piece 48 is completely fixed with the positioning screw 50 for the low side of the lower head after the adjustment. Then, the position of a tapered surface 46a of the cam piece of the upper head is moved, and the landing position is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when recording and reading information on a magnetic disk using a magnetic head, sends out the magnetic head to contact (load) the recording surface of the magnetic disk and release the contact. The present invention relates to a head load / unload adjusting mechanism of a magnetic disk device that controls the movement of a magnetic head so that the magnetic head is returned to the standby position (unloading).

[0002]

2. Description of the Related Art Conventionally, there is known a magnetic disk device for loading or unloading a magnetic head arranged on one side of a magnetic disk or a plurality of magnetic heads arranged so as to sandwich the magnetic disk. In the magnetic disk device, the airflow generated on the surface of the magnetic disk when the magnetic disk used as a storage medium is rotated at a high speed is utilized so that the magnetic head is floated above the surface of the magnetic disk by a certain height during use. ing. Such magnetic disk devices are roughly classified into two types: a fixed-medium type device in which a storage medium cannot be replaced and a medium-exchangeable type device in which a magnetic disk as a storage medium can be attached / detached.

In a so-called medium exchange type magnetic disk device, it is necessary to unload and retract the magnetic head from the magnetic disk before taking out the medium from the device. Further, when recording and reading information on the magnetic disk, it is necessary to load the magnetic head onto the magnetic disk. That is, a head load / unload mechanism is required.

Also in the fixed magnetic disk apparatus, the magnetic head is unloaded in order to prevent the magnetic head from sticking to the magnetic disk and to prevent the magnetic head from damaging the magnetic disk due to an impact. It is preferable to keep.

[0005]

The magnetic disk used in such a medium exchange type apparatus or medium fixed type apparatus is
There is a region called a floating guarantee region that is guaranteed with respect to the floating performance of the magnetic head. For example, in the case of a 5.25-inch disk, the outer diameter of the disk is R = 65 mm, whereas the range of R = 63.5 mm is generally set as the floating guarantee area. Head load is disk R
= 63.5 mm must be performed on the inner peripheral side. If this is not the case, the magnetic head will stick out from the outer peripheral edge of the magnetic disk and normal landing will not be possible.

Further, the track, which is the data area on the disk, must be surely on the inner circumference side of the position of the magnetic head when the head loading is completely finished. Otherwise, when the magnetic head accesses the outermost track, unloading has already started, and the magnetic head cannot read / write a signal from / to the magnetic disk.

This will be explained with reference to specific dimension examples.
If there is a 2 mm variation in the head load / unload position on the magnetic disk in the head load / unload mechanism, the track has the above-mentioned floating guarantee area R = 63.5 mm.
Therefore, it can be set only in the region of R = 61.5 mm or less further inside.

One method for increasing the storage capacity of the disk device is to secure a storage area in a wider area on the magnetic disk.

An object of the present invention is to reduce the variation of the load position of the magnetic head on the magnetic disk and to expand the storage area on the magnetic disk, so that the head load / unload adjusting mechanism of the magnetic disk device can be expanded. And to realize a simple and reliable adjustment mechanism as much as possible.

[0010]

The present invention solves this problem by
Head load / unload adjustment of a magnetic disk drive that directly / indirectly slides a gimbal spring with a magnetic head mounted on it and the taper surface of the cam to add vertical movement to the seek head movement. In the mechanism,
The above problem is solved by providing the cam with a positioning portion that is movable only in the head seek direction.

It is preferable that the cam is composed of two cam pieces corresponding to the upper and lower magnetic heads, each having a seek direction adjusting positioning portion.

It is advantageous if the cam is assembled by adding a biasing means for preventing a deviation when adjusting the seek direction.

It is also preferable that the fixing means for fixing the cam to the magnetic disk device also serves as positioning when adjusting the cam seek position.

It is preferable that the cam is made of resin or metal having good slidability.

[0015]

The details of the present invention will be described based on the embodiments shown in the drawings.

An adjustment mechanism of the rotary type head access type in which the gimbal spring and the sloped portion of the cam are indirectly slid through the parts to load / unload will be described. However, the present invention is not limited to this, and is also applicable to a linear access type and a type in which the gimbal spring and the slope portion of the cam slide directly to load / unload.

FIG. 1 shows the layout of the magnetic disk device in which the disk cartridge 12 for housing the magnetic disk 10 is mounted. The back surface of the cartridge 12 is fixed to the spindle motor 14, and the load / unload adjustment mechanism 16 allows the magnetic head 18 to be accessible.

2a-c, the disk cartridge 12 is shown.
The upper surface and the lower surface of the disk and the magnetic disk device are illustrated respectively. A head access window is provided on the edge surface of the cartridge 12, and a shutter 20 is slidably attached so as to close the window. As shown in FIG. 2B, an armature clamp 22 and an armature hub 24 for fixing to the drive unit of the magnetic disk drive are arranged on the back surface of the cartridge 12. On the other hand, a magnetic disk device for accommodating the cartridge and for writing and reading information on the magnetic disk accommodated in the cartridge has a spindle motor 14 for rotating the magnetic disk as shown in FIG. 2c. A load / unload adjusting mechanism 16 for accessing the magnetic disk to the magnetic head 18 is provided in the lower center of the drawing so as to be rotatable. On the front end surface of the magnetic disk device, an eject button and a start / stop button are arranged in addition to a front door 26 for inserting a cartridge.

FIG. 3 shows a magnetic disk 10 and a magnetic head 1.
The layout in which the cam 8, the cam 6, and the carriage 7 are extracted is shown. On the magnetic disk 10, there are a floating guarantee area 28 having a boundary near the outer peripheral edge thereof, a data area 30 having an inner diameter smaller than that area, and a landing area 32 which is the floating guarantee area 28 but not the data area 30. is doing.

FIG. 4 shows the retracted state (returned state, retracted state) of the magnetic head of the magnetic disk device, and FIG.
An exploded plan view of the load / unload adjusting mechanism 16 is shown in FIG. Head gimbal 2 in the retracted state
Are lifted by a head lifter (engaging member) 3 in a direction perpendicular to the magnetic disk surface.

The magnetic heads 18 arranged so as to sandwich the magnetic disk 10 from above and below are attached to the tip end side of the plate-shaped gimbal 2, and the base end side of the gimbal 2 is attached to the carriage 7. The carriage 7
Is supported by the main body of the apparatus shown in FIGS. 1 and 2c so that its base end side can swing around a fulcrum 34. As can be seen from FIG. 5, the head lifter 3 is rotatably supported by the mounting portion 7 a of the carriage 7 via pins 4. The head lifter 3 is on the front side (left side in the figure).
However, it is engaged with the rotation stopper 36 of the carriage mounting portion 7a to restrict its rotation, and is biased toward the magnetic disk side by the spring 6 in order to stabilize the position when the head is loaded. The position of the head lifter 3 in the rotational direction is defined by a cam 6 fixed to the apparatus body.

The positional relationship among the magnetic disk, the magnetic head, the head lifter, and the cam when the head is loaded will be described. The head lifter 3 has an engaging portion on the base end side (right side in the drawing) as shown in FIGS. While 3a engages with the cam 6,
The tip side is in contact with the inside of the gimbal 2. Therefore, when the carriage swings toward the magnetic disk, the head lifter 3 swings up and down around the pin by the tapered surface 6a of the cam 6, and accordingly, the pair of magnetic heads 18 moves up and down. It is configured to do. The pair of upper and lower cams 6 are respectively provided with tapered surfaces 6a connected to parallel plane portions that guide the engaging portions 3a of the upper and lower head lifters 3, respectively. Sliding between the tapered surfaces 6a and the engaging portions 3a of the head lifter 3 is performed. The movement starts the loading of the magnetic head 18 (FIG. 6 a), the magnetic head 18 lands on the magnetic disk surface (FIG. 6 b), and then the gimbal 2 and the head lifter 3 are released (FIG. 6 c), and the data is transferred. Read / write state (FIG. 6d). At the time of unloading, the positional relationship between the magnetic head and the head lifter shifts from FIG. 6c to FIG. 6b and FIG. 6a. The upper and lower taper surfaces may be slightly offset from each other, and the load / unload start timings of the upper and lower magnetic heads may be offset from each other.

Next, the operation of the magnetic disk device will be described with reference to FIG.

In the retracted state of the magnetic head 18 shown in the position A of FIG. 7, a pair of upper and lower head lifters 3 are engaged so as to separate the gimbal 2 from the magnetic disk 10 and open it in the vertical direction (FIG. 6a). ), When loading / unloading of the magnetic head 18 is started in this state,
Each head lifter 3 and the gimbal 2 swing around the rotation fulcrum of the carriage, and sequentially move from the position indicated by B in FIG. 7 to the position indicated by C. At the same time, the magnetic head 18 also moves sequentially in FIGS.
That is, at the position A in FIG. 7, each magnetic head 18 is in a state of being separated from the magnetic disk surface by the engagement of the parallel plane portion of the cam 22 and the engaging portion 3a of the head lifter 3, and the loading is started. As the carriage oscillates in the direction of the magnetic disk 10 around the rotation fulcrum, the engaging portion 3a of the head lifter 3 slides down along the tapered surface 6a of the cam 6 in the flying guarantee area as shown in FIG. 6b. Thus, both the upper and lower head lifters 3 operate to narrow both gimbals 2 and reach the landing state. In this case, the generated torque applied to the magnetic head 18 is maximized between FIG. 6a and FIG. 6b, but if both tapered surfaces 6a of the cam 6 are provided with a slight dimensional deviation, The total maximum torque applied to the magnetic head 18 is substantially halved, and the head load speed does not increase so much.

After the head is loaded, the gimbal 2 pushes the magnetic head 18 against the magnetic disk 10,
The rotation of the magnetic disk 10 balances with the force that causes the magnetic head 18 to float, and maintains a stable flying state.

When the carriage 7 reaches the inside of the magnetic disk 10, as shown in FIG. 6c, the bias of the gimbals 2, that is, the magnetic head 18 by both lifters 3 is released, and the data area of the magnetic disk 10 is released. At this point, as shown in FIG. 3d, each magnetic head 18 is surely brought into contact with the surface of the magnetic disk to write or read data.

The head loading / unloading mechanism is as described above, but the landing position of the magnetic head 18 on the magnetic disk 10 housed in the cartridge case is as follows.
As can be understood from FIG. 8, variations occur among the disk devices due to deviations of the components such as the carriage 7, the gimbal 2, the head lifter 3, and the cam 6 from the reference position. In the present invention, the landing accuracy is improved by slightly changing the position of the cam gradient portion in the seek direction for each head and adjusting the head landing position.

The cam 6 according to the present invention is assembled from the parts shown in FIGS. 9A corresponds to FIG. 7, and is a plan view when the cam is attached to the apparatus main body, FIG. 9B is a front view corresponding to FIG. 6, and FIG. 9C is an end view seen from the left side of FIG. 9A. FIG. 1 showing a cam piece 46 for the upper head
0, and the cam pieces 48 for the lower head shown in FIGS.
Are in the directions corresponding to a, b, and c in FIG. 9, respectively.

The state of the assembly will be described with reference to FIGS.

The magnetic head 18 is placed at the position shown in FIG.
And after arranging the head lifter 3, the device main body 42,
The lower head cam piece 48 shown in FIG. 11, the upper head cam piece 46 shown in FIG. 10, and the cam pressing spring 44 shown in FIG. 9 are brought to the state shown in FIGS. Temporarily assemble. At that time, the lower head side positioning screw 5
0 is a state where the lower head cam piece 48 is not completely fixed,
15b and c, the lower head cam piece 48 and the upper head cam piece 46 are screwed into the apparatus main body 42 and under the action of the pressing force of the cam pressing spring 44, without rattling in the unload state. It is fixed by the upper head side positioning screw 52 to the extent that the adjustment shown is possible. Positioning pins 56 for the upper and lower heads are fitted in the main body of the apparatus and slidably engaged with the corresponding notches of the lower head cam piece 48 and the upper head cam piece 46.

In this temporary assembly state, first, the landing position adjusting jig 58 for the lower head cam piece is finely rotated by the driver 54, and the lower head cam piece 48 is moved, as can be understood from FIGS. 14 and 15b. The head seek direction, that is, the horizontal direction in FIG. 14, is finely slid to move the position of the taper surface 48a of the lower head cam piece to precisely adjust the landing position of the lower head. After the adjustment, the lower head-side positioning screw 50 completely fixes the lower head cam piece 48.

Then, using the landing position adjusting jig 60 for the upper head cam piece, the upper head cam piece 46 is slightly slid in the left-right direction in FIG. 14, as understood from FIGS. 14 and 15c. , The taper surface 46 of the cam piece for the upper head
The position of "a" is moved to precisely adjust the landing position of the upper head. After the adjustment, the upper head cam piece 46 is also completely fixed by the upper head side positioning screw 52.

After the adjustment, the magnetic head 18 is unloaded at the position shown in FIG. 16 to prepare for the operation of the magnetic disk device.

As will be understood from the above description of the adjustment, the cam piece 46 for the upper head and the cam change 48 for the lower head both slide during the adjustment, and when the head is loaded / unloaded, the cam 6 and the head lifter 3 are moved. Since the and are slidable, it is preferable that the cam material is a resin having good sliding characteristics and less wear and dust generation, for example, a resin containing fluorine. If there is little dust generation, it is possible to eliminate causes such as read / write errors and head crashes. Alternatively, if the material is a metal such as SUS non-magnetic material, sliding characteristics and wear resistance can be obtained,
Strength is also improved, and dust such as burrs generated from the cam itself can be removed by an easy method such as barrel processing or chemical treatment.
Expected to be as effective as or better than resin.

In this embodiment, each cam piece is provided with a notch so that adjustment can be performed by a jig. However, even if the notch is not used, a portion or member capable of sliding adjustment such as a hole, a gear or a pin is used. You can serve your purpose.

[0036]

In the head load / unload adjusting mechanism according to the first aspect of the present invention, since the cam is provided with the positioning portion which is movable only in the head seek direction, it is possible to reduce variations in the head landing position and to reduce the data area. The storage capacity of the device can be improved by expansion.

Further, in the head load / unload adjusting mechanism of the second aspect, since the cam is composed of two cam pieces corresponding to the upper and lower magnetic heads, each of which has a seek direction adjusting positioning portion, Appropriate assembly work can be performed in a magnetic disk device having a pair of magnetic heads.

Further, in the head load / unload adjusting mechanism of the third aspect, since the cam is assembled by adding the biasing means for preventing the deviation during the seek direction adjustment, the assembly work on the apparatus main body is performed. You can improve the property.

In the head load / unload adjusting mechanism of the fourth aspect, the fixing means for fixing the cam to the magnetic disk device also serves as the positioning for adjusting the cam seek position, so that the number of parts can be reduced and the cost can be reduced. It is possible.

[Brief description of drawings]

FIG. 1 is a schematic view of a magnetic disk device in which a cartridge for housing a magnetic disk is mounted, FIG. 1a is a plan view, and FIG. 1b is a side view.

2A and 2B are perspective views of a cartridge and a magnetic disk device. FIG. 2A shows a cartridge upper surface, FIG. 2B shows a cartridge lower surface, and FIG. 2C shows a magnetic disk device.

FIG. 3 is a diagram showing a layout in which a magnetic disk, a magnetic head, a cam, and a carriage are extracted, and FIG.
Figure 3b is an end view.

FIG. 4 is a diagram showing a retracted state of a magnetic head of a magnetic disk device.

5 is an exploded plan view of the load / unload adjustment mechanism of FIG. 4. FIG.

FIG. 6 shows a magnetic disk, a magnetic head when the head is loaded,
FIG. 6 is a diagram showing the positional relationship between the head lifter and the cam. As the process goes from FIG. 6a to d, the magnetic head loads onto the magnetic disk.

FIG. 7 is a diagram showing the operation of the magnetic disk, showing the change from the retracted state to the loaded state of the magnetic head.

FIG. 8 is a diagram showing variations in head landing positions in a conventional device.

9A and 9B are views showing a spring structure constituting a cam according to the present invention, FIG. 9A is a plan view when the spring is attached to the apparatus main body, FIG. 9B is a front view, and FIG. 9C is viewed from the left side of FIG. 9A. FIG.

10 is a diagram showing a cam piece for an upper head that constitutes a cam according to the present invention, in which a, b, and c are respectively a to b in FIG.
The orientation corresponds to c.

FIG. 11 is a diagram showing a lower head cam piece constituting a cam according to the present invention, in which a, b, and c are respectively a to b in FIG.
The orientation corresponds to c.

FIG. 12 is a plan view showing the positional relationship between the cam and the head lift when the cam landing position is adjusted.

FIG. 13 is a schematic sectional view showing how the cam according to the present invention is assembled.

FIG. 14 is a plan view showing how the cam according to the present invention is assembled.

FIG. 15 is a schematic cross-sectional view showing how to adjust the cam according to the present invention.

FIG. 16 is a plan view showing how the magnetic head is unloaded after adjusting the landing position.

[Explanation of symbols]

 6 Cam 42 Device Main Body 44 Cam Holding Spring 46 Upper Head Cam Piece 48 Lower Head Cam Piece 58 Lower Head Landing Position Adjustment Tool

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[Procedure amendment]

[Submission date] February 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when recording and reading information on a magnetic disk using a magnetic head, sends out the magnetic head to contact (load) the recording surface of the magnetic disk and release the contact. The present invention relates to a head load / unload adjusting mechanism of a magnetic disk device that controls the movement of a magnetic head so that the magnetic head is returned to the standby position (unloading).

[0002]

2. Description of the Related Art Conventionally, there is known a magnetic disk device for loading or unloading a magnetic head arranged on one side of a magnetic disk or a plurality of magnetic heads arranged so as to sandwich the magnetic disk. In the magnetic disk device, the airflow generated on the surface of the magnetic disk when the magnetic disk used as a storage medium is rotated at a high speed is utilized so that the magnetic head is floated above the surface of the magnetic disk by a certain height during use. ing. Such magnetic disk devices are roughly classified into two types: a fixed-medium type device in which a storage medium cannot be replaced and a medium-exchangeable type device in which a magnetic disk as a storage medium can be attached / detached.

In a so-called medium exchange type magnetic disk device, it is necessary to unload and retract the magnetic head from the magnetic disk before taking out the medium from the device. Further, when recording and reading information on the magnetic disk, it is necessary to load the magnetic head onto the magnetic disk. That is, a head load / unload mechanism is required.

Also in the fixed magnetic disk apparatus, the magnetic head is unloaded in order to prevent the magnetic head from sticking to the magnetic disk and to prevent the magnetic head from damaging the magnetic disk due to an impact. It is preferable to keep.

[0005]

The magnetic disk used in such a medium exchange type apparatus or medium fixed type apparatus is
There is a region called a floating guarantee region that is guaranteed with respect to the floating performance of the magnetic head. For example, in the case of a 5.25-inch disk, the outer diameter of the disk is R = 65 mm, whereas the range of R = 63.5 mm is generally set as the floating guarantee area. Head load is disk R
= 63.5 mm must be performed on the inner peripheral side. If this is not the case, the magnetic head will stick out from the outer peripheral edge of the magnetic disk and normal landing will not be possible.

Further, the track, which is the data area on the disk, must be surely on the inner circumference side of the position of the magnetic head when the head loading is completely finished. Otherwise, when the magnetic head accesses the outermost track, unloading has already started, and the magnetic head cannot read / write a signal from / to the magnetic disk.

This will be explained with reference to specific dimension examples.
If there is a 2 mm variation in the head load / unload position on the magnetic disk in the head load / unload mechanism, the track has the above-mentioned floating guarantee area R = 63.5 mm.
Therefore, it can be set only in the region of R = 61.5 mm or less further inside.

One method for increasing the storage capacity of the disk device is to secure a storage area in a wider area on the magnetic disk.

An object of the present invention is to provide a head load / unload adjustment mechanism for a magnetic disk drive which can reduce variations in the load position of the magnetic head on the magnetic disk and expand the storage area on the magnetic disk. It is to provide the adjustment mechanism that is as simple and reliable as possible.

[0010]

The present invention solves this problem by
Head load / unload adjustment of a magnetic disk drive that directly / indirectly slides a gimbal spring with a magnetic head mounted on it and the taper surface of the cam to add vertical movement to the seek head movement. In the mechanism,
The above problem is solved by providing the cam with a positioning portion that is movable only in the head seek direction.

It is preferable that the cam is composed of two cam pieces corresponding to the upper and lower magnetic heads, each having a seek direction adjusting positioning portion.

It is advantageous if the cam is assembled by adding a biasing means for preventing a deviation when adjusting the seek direction.

It is also preferable that the fixing means for fixing the cam to the magnetic disk device also serves as positioning when adjusting the cam seek position.

It is preferable that the cam is made of resin or metal having good slidability.

[0015]

The details of the present invention will be described based on the embodiments shown in the drawings.

An adjustment mechanism of the rotary type head access type in which the gimbal spring and the sloped portion of the cam are indirectly slid through the parts to load / unload will be described. However, the present invention is not limited to this, and is also applicable to a linear access type and a type in which the gimbal spring and the slope portion of the cam slide directly to load / unload.

The layout of the magnetic disk device in which the disk cartridge 12 for housing the magnetic disk 10 is mounted is shown in FIGS . The back surface of the cartridge 12 is fixed to the spindle motor 14, and the load / unload adjustment mechanism 16 allows the magnetic head 18 to be accessible.

The disk cartridge 12 is shown in FIGS.
The upper surface and the lower surface of the disk and the magnetic disk device are illustrated respectively. A head access window is provided on the edge surface of the cartridge 12, and a shutter 20 is slidably attached so as to close the window. As shown in FIG. 4 , on the back surface of the cartridge 12, an amateur clamp 22 and an amateur hub 24 for fixing to the drive device of the magnetic disk device are arranged. On the other hand, a magnetic disk device for accommodating the cartridge and for writing and reading information on the magnetic disk accommodated in the cartridge has a spindle motor 14 for rotating the magnetic disk as shown in FIG. A load / unload adjusting mechanism 16 for accessing the magnetic disk to the magnetic head 18 is provided in the lower center of the drawing so as to be rotatable. On the front end surface of the magnetic disk device, an eject button and a start / stop button are arranged in addition to a front door 26 for inserting a cartridge.

FIG . 6 shows a magnetic disk 10 and a magnetic head 1.
The layout in which the cam 8, the cam 6, and the carriage 7 are extracted is shown. On the magnetic disk 10, there are a floating guarantee area 28 having a boundary near the outer peripheral edge thereof, a data area 30 having an inner diameter smaller than that area, and a landing area 32 which is the floating guarantee area 28 but not the data area 30. is doing.

[0020]Figure 7Of the magnetic head of the magnetic disk device
Indicates the retract state (return state, save state),Figure 8
And an exploded plan view of the load / unload adjusting mechanism 16.
Indicates. Head gimbal 2 in the retracted state
The magnetic disk by the head lifter (engaging member) 3.
It is lifted in the direction perpendicular to the front surface.

The magnetic heads 18 arranged so as to sandwich the magnetic disk 10 from above and below are attached to the tip end side of the plate-shaped gimbal 2, and the base end side of the gimbal 2 is attached to the carriage 7. The carriage 7
Is such that its base end side can swing about the fulcrum 34, as shown in FIG.
It is supported by the apparatus main body shown in FIG. As can be seen from FIG. 8 , the head lifter 3 is rotatably supported by the mounting portion 7 a of the carriage 7 via the pin 4. The head lifter 3 is on the front side (left side in the figure).
However, it is engaged with the rotation stopper 36 of the carriage mounting portion 7a to restrict its rotation, and is biased toward the magnetic disk side by the spring 6 in order to stabilize the position when the head is loaded. The position of the head lifter 3 in the rotational direction is defined by a cam 6 fixed to the apparatus body.

The head loading time of the magnetic disk, magnetic head, head lifter, explaining the positional relation of the cam, head lifter 3, as shown in FIG. 9 to d, the engagement of the base end side (right side in the drawing) While the portion 3a engages with the cam 6,
The tip side is in contact with the inside of the gimbal 2. Therefore, when the carriage swings toward the magnetic disk, the head lifter 3 swings up and down around the pin by the tapered surface 6a of the cam 6, and accordingly, the pair of magnetic heads 18 moves up and down. It is configured to do. The pair of upper and lower cams 6 are respectively provided with tapered surfaces 6a connected to parallel plane portions that guide the engaging portions 3a of the upper and lower head lifters 3, respectively. Sliding between the tapered surfaces 6a and the engaging portions 3a of the head lifter 3 is performed. The movement starts the loading of the magnetic head 18 ( FIG. 9A ), the magnetic head 18 lands on the magnetic disk surface ( FIG. 9B), and then the gimbal 2 and the head lifter 3 are released ( FIG. 9C). ), It becomes a data read / write state ( FIG. 9d). During unloading, the positional relationship between the magnetic head and the head lifter is moves to FIG. 9 b, Figure 9 a from Figure 9 c. The upper and lower taper surfaces may be slightly offset from each other, and the load / unload start timings of the upper and lower magnetic heads may be offset from each other.

Next, the operation of the magnetic disk apparatus will be described in FIG. 10.

The magnetic head 18 shown at the position A in FIG .
In the retract state, the pair of upper and lower head lifters 3 are engaged so as to separate the gimbal 2 from the magnetic disk 10 and open in the vertical direction ( FIG. 9A ). In this state, the magnetic head 18 is loaded / unloaded. 10 is started, each head lifter 3 and the gimbal 2 swing around the rotation fulcrum of the carriage, and sequentially move from the position indicated by B in FIG. 10 to the position indicated by C. At the same time, the magnetic head 18 in FIG. 9 to d, sequentially moves. That is, at the position A in FIG.
Is the parallel plane portion of the cam 22 and the engaging portion 3 of the head lifter 3.
By the engagement with a, it is separated from the magnetic disk surface, and when the carriage swings in the direction of the magnetic disk 10 around the rotation fulcrum with the start of loading, in the floating guaranteed area, as shown in FIG. 9B . Head lifter 3
The engaging portion 3a of the cam slides along the tapered surface 6a of the cam 6 so as to slide down, and both upper and lower head lifters 3 operate to narrow both gimbals 2 and reach the landing state. In this case, the generated torque applied to the magnetic head 18 is maximized in the period from FIG. 9A to FIG. 9B, but if both tapered surfaces 6a of the cam 6 are provided with a slight dimensional deviation, The overall maximum torque applied to both magnetic heads 18 is halved, and the head load speed does not increase so much.

After the head is loaded, the gimbal 2 pushes the magnetic head 18 against the magnetic disk 10,
The rotation of the magnetic disk 10 balances with the force that causes the magnetic head 18 to float, and maintains a stable flying state.

When the carriage 7 reaches the inside of the magnetic disk 10, as shown in FIG. 9C , the urging of the gimbals 2, that is, the magnetic head 18 by both lifters 3 is released, and the data on the magnetic disk 10 is released. When reaching the area, as shown in FIG. 9D, each magnetic head 18 is surely brought into contact with the magnetic disk surface to write or read data.

The head loading / unloading mechanism is as described above, but the landing position of the magnetic head 18 on the magnetic disk 10 housed in the cartridge case is as follows.
As can be understood from FIG. 11 , variations occur among the disk devices due to deviations of the components such as the carriage 7, gimbal 2, head lifter 3, cam 6 from the reference position. In the present invention, the landing accuracy is improved by slightly changing the position of the cam gradient portion in the seek direction for each head and adjusting the head landing position.

The cam 6 according to the present invention is assembled from the parts shown in FIGS . 12A corresponds to FIG. 10 , a plan view when the cam is attached to the apparatus main body, FIG . 12B is a front view corresponding to FIG. 9 , and FIG .
Is an end view as seen from the left side of 2 a. Upper head cam piece 4
13 showing 6 and FIG . 14 showing the lower head cam piece 48 .
A, b, and c are in the directions corresponding to a, b, and c in FIG. 12 , respectively.

[0029] Based on the state of the assembly 15-17 will be described.

The magnetic head 18 is placed at the position shown in FIG .
And after arranging the head lifter 3, the device main body 42,
Cam piece 48 for the lower head shown in FIG. 14, the head cam piece 46 on shown in FIG. 13, the cam pressing spring 44 shown in FIG. 12, in turn, the state shown in FIGS. 16 and 17 Temporarily assemble. At that time, the lower head side positioning screw 50 is screwed into the apparatus main body 42 in a state where the lower head cam piece 48 is not completely fixed, and under the action of the pressing force of the cam pressing spring 44, the lower head cam piece 48 is pressed. The upper head side positioning screw 52 fixes the upper head side cam screw 46 and the upper head cam piece 46 so that the adjustment shown in FIGS . In the device body,
Positioning pins 56 of the upper and lower heads are fitted and slidably engaged with corresponding notches of the lower head cam piece 48 and the upper head cam piece 46.

In this temporary assembly state, first, the landing position adjusting jig 58 for the lower head cam piece is slightly rotated by the driver 54, and as can be understood from FIGS. Is finely slid in the head seek direction, that is, the horizontal direction in FIG. 17 , and the position of the taper surface 48a of the lower head cam piece is moved to precisely adjust the landing position of the lower head. After the adjustment, the lower head-side positioning screw 50 completely fixes the lower head cam piece 48.

Then, using the landing position adjusting jig 60 for the upper head cam piece, as can be understood from FIGS. 17 and 18c , the upper head cam piece 46 is slightly slid in the left-right direction in FIG. Then, the taper surface 46 of the cam piece for the upper head
The position of "a" is moved to precisely adjust the landing position of the upper head. After the adjustment, the upper head cam piece 46 is also completely fixed by the upper head side positioning screw 52.

After the adjustment, the magnetic head 18 is unloaded at the position shown in FIG. 19 to prepare for the operation of the magnetic disk device.

As will be understood from the above description of the adjustment, the cam piece 46 for the upper head and the cam change 48 for the lower head both slide during the adjustment, and when the head is loaded / unloaded, the cam 6 and the head lifter 3 are moved. Since the and are slidable, it is preferable that the cam material is a resin having good sliding characteristics and less wear and dust generation, for example, a resin containing fluorine. If there is little dust generation, it is possible to eliminate causes such as read / write errors and head crashes. Alternatively, if the material is a metal such as SUS non-magnetic material, sliding characteristics and wear resistance can be obtained,
Strength is also improved, and dust such as burrs generated from the cam itself can be removed by an easy method such as barrel processing or chemical treatment.
Expected to be as effective as or better than resin.

In this embodiment, each cam piece is provided with a notch so that adjustment can be performed by a jig. However, even if the notch is not used, a portion or member capable of sliding adjustment such as a hole, a gear or a pin is used. You can serve your purpose.

[0036]

In the head load / unload adjusting mechanism according to the first aspect of the present invention, since the cam is provided with the positioning portion which is movable only in the head seek direction, it is possible to reduce variations in the head landing position and to reduce the data area. The storage capacity of the device can be improved by expansion.

Further, in the head load / unload adjusting mechanism of the second aspect, since the cam is composed of two cam pieces corresponding to the upper and lower magnetic heads, each of which has a seek direction adjusting positioning portion, Appropriate assembly work can be performed in a magnetic disk device having a pair of magnetic heads.

Further, in the head load / unload adjusting mechanism of the third aspect, since the cam is assembled by adding the biasing means for preventing the deviation during the seek direction adjustment, the assembly work on the apparatus main body is performed. You can improve the property.

In the head load / unload adjusting mechanism of the fourth aspect, the fixing means for fixing the cam to the magnetic disk device also serves as the positioning for adjusting the cam seek position, so that the number of parts can be reduced and the cost can be reduced. It is possible. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic plan view of a magnetic disk device in which a cartridge for housing a magnetic disk is mounted .

[Fig. 2] Attach the cartridge to store the magnetic disk .
FIG. 3 is a schematic side view of the magnetic disk device in a closed state.

FIG. 3 is a top perspective view of the cartridge.

FIG. 4 is a bottom perspective view of the cartridge.

FIG. 5 is a perspective view of a magnetic disk device.

FIG. 6 magnetic disk, magnetic head, cam, carriage
FIG. 6A is a plan view showing the layout of FIG.
Figure 6b is an end view.

FIG. 7: Retracting shape of a magnetic head of a magnetic disk device
It is a figure which shows a state.

FIG. 8 is an exploded plane view of the load / unload adjusting mechanism of FIG .
It is a figure.

FIG. 9 is a magnetic disk at the time of head loading, a magnetic head,
FIG. 9A is a diagram showing the positional relationship between the head lifter and the cam, starting from FIG. 9A.
The magnetic head loads onto the magnetic disk as it progresses to d.
It

FIG. 10 is a diagram showing the operation of the magnetic disk, in which the magnetic head
Represents the change from the retract state to the load state.

FIG. 11: Variation in head landing position in conventional device
It is a figure which shows a luck.

FIG. 12 shows a spring structure constituting a cam according to the present invention .
In the figure, Fig. 12a shows the case where the spring is attached to the main body of the device.
12b is a front view, FIG. 12c is the left side of FIG. 12a.
It is an end view seen from the side.

FIG. 13 is a cam for an upper head that constitutes a cam according to the present invention .
12A and 12B are views showing a piece, and a, b, and c are respectively a in FIG.
It is for the direction corresponding to ~ c.

FIG. 14 is a cam for a lower head that constitutes a cam according to the present invention .
12A and 12B are views showing a piece, and a, b, and c are respectively a in FIG.
It is for the direction corresponding to ~ c.

FIG. 15 shows a case of adjusting the cam landing position .
FIG. 6 is a plan view showing a positional relationship between a cam and a head lift.

FIG. 16 shows how a cam according to the present invention is assembled.
It is a schematic sectional view.

FIG. 17 shows how a cam according to the present invention is assembled.
FIG.

FIG. 18 is a schematic view showing how the cam according to the present invention is adjusted.
FIG.

FIG. 19 shows a magnetic head after adjusting the landing position.
It is a top view which shows a mode that a mode is unloaded.

[Description of Reference Signs] 6 cam 42 device body 44 cam pressing spring 46 upper head cam piece 48 lower head cam piece 58 lower head landing position adjustment jig

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

FIG. 16

FIG. 17

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

[Fig. 12]

[Fig. 13]

FIG. 14

FIG. 15

FIG. 18

FIG. 19

Claims (6)

[Claims] 1. A head of a magnetic disk device, wherein a gimbal spring having a magnetic head mounted thereon and a taper surface of a cam slide directly / indirectly to add motion in a seek direction of the magnetic head in a vertical direction. In the load / unload adjusting mechanism, the cam is provided with a positioning portion that can move only in the head seek direction. 2. The head load / unload according to claim 1, wherein the cam is composed of two cam pieces corresponding to the upper and lower magnetic heads and each having a seek direction adjusting positioning portion. Load adjustment mechanism. 3. The head load / unload adjusting mechanism according to claim 1, wherein the cam is assembled by adding an urging means for preventing a deviation when adjusting the seek direction. 4. The head load / unload adjusting mechanism according to claim 1, wherein the fixing means for fixing the cam to the magnetic disk device also serves as positioning when adjusting the cam seek position. 5. The head load / unload adjusting mechanism according to claim 1, wherein the cam is made of a resin having good slidability. 6. The head load / unload adjusting mechanism according to claim 1, wherein the cam is made of metal.