JP2507050B2 - Magnetic disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive device, and more particularly to a magnetic disk drive device including a stepping motor for advancing and retracting the magnetic head. The vertical vibration of the carriage equipped with is dampened at an early stage to stabilize the contact between the magnetic head and the magnetic disk after the seek, and thus the magnetic head settling time can be greatly shortened compared to the conventional case. Vibration damping mechanism.

[Conventional technology]

The prior art relating to a magnetic disk drive device is disclosed, for example, in Japanese Patent Application Laid-Open No. 62-134870 entitled "Magnetic Head Feed Mechanism", and the magnetic head feed mechanism disclosed therein incorporates a magnetic head. By applying a lateral pressure to the guide shaft for guiding the carriage, the vibration between the guide shaft and the carrier is reduced.

Therefore, the magnetic head feeding mechanism described in the above-mentioned Japanese Patent Laid-Open No. 62-134870 is effective because the torque of the stepping motor is 4 times larger than the sliding force of the carriage which is a load.
This is an overwhelmingly large ~ 5 times.

In other words, if there is no margin in the torque of the stepping motor with respect to the sliding load of the carriage, it is not preferable to increase the sliding resistance between the carriage and the guide shaft, which causes other problems.

[Problems to be Solved by the Invention]

Possible problems include deterioration of the step plate when the magnetic head moves from track to track,
There is deterioration of magnetic head positioning.

However, in recent years, magnetic disk drive devices have also been used for other OA.
As with equipment, they are becoming smaller and lighter. For this reason,
The stepping motor that moves the carriage forward and backward has also been downsized, and the motor torque has been reduced as much as possible.

Under these circumstances, in order to reduce the settling time of the magnetic head, it is necessary to avoid an increase in sliding resistance in the seek direction as much as possible and to damp the vibration of the carriage.

However, improving the settling time in the same way as when there is a margin in the torque of the stepping motor not only causes the problems described above, but also seeks when the sliding resistance increases with time. There is a possibility of causing a fatal defect of being impossible.

An object of the present invention is to miniaturize a stepping motor for advancing and retracting a carriage, and even if the motor torque becomes smaller accordingly, the vertical vibration of the carriage is damped at an early stage, and a magnetic head after the seek is completed. It is an object of the present invention to provide a magnetic disk drive device capable of stabilizing contact with a magnetic disk and further shortening the settling time of the magnetic head as compared with the conventional one.

[Means for solving the problem]

In the magnetic disk drive device including a stepping motor that supports a carriage having a magnetic head slidably supported by a guide shaft and moves the carriage forward and backward, an elastic member fixed to the carriage is used as a guide. With the shaft as a reference, while pressingly engaging with a groove of a lead screw provided on one side thereof, the carriage has the guide shaft as a reference,
Located on the opposite side of the elastic member, slidably supported by rails interposed between the carriage and chassis,
In addition, the carriage is configured to receive a turning force due to the engagement of the lead screw and the elastic member based on the arrangement of the guide shaft, the lead screw, and the rail interposed between the carriage and the chassis. Achieved by binding together due to the tackiness of grease, grease and other oils.

Further, instead of the first configuration, the above-mentioned object is to integrally connect a rail to the lower part of the carriage and integrally bond the rail and the chassis by the adhesiveness of grease or other oil. It can also be achieved.

Further, instead of the first and second configurations, the above-mentioned object is to integrally install a rail on the upper part of the chassis, and integrally provide a space between the rail and the carriage by adhesion of grease or other oil. It is also achieved by combining.

Furthermore, the above object can be achieved by interposing a rail made of an oil-impregnated material between the carriage and the rail instead of the first to third configurations.

[Action]

Thus, according to the present invention, as described above, in the magnetic disk drive device, the elastic member fixed to the carriage is press-engaged with the groove of the lead screw, and the carriage is located on the opposite side to the elastic member. The carriage is slidably supported by the rail, and the carriage is configured to receive a rotational force due to the engagement of the lead screw and the elastic member. According to the present invention, in order to suppress the vibration of the carriage, the above-mentioned JP-A-62-134870 is used.
It is not necessary to apply lateral pressure to a guide shaft for carrying a carriage, which is equipped with a magnetic head, as in the publication.

That is, as described above, the magnetic head feeding mechanism described in Japanese Patent Laid-Open No. 62-134870 is effective because the torque of the stepping motor is overwhelmingly larger than the sliding force of the carriage as a load. However, according to the present invention, the elastic member fixed to the carriage is press-engaged with the groove of the lead screw, and the carriage is located on the side opposite to the elastic member and slidable by the rail. The carriage is supported, and the carriage is configured to receive a rotational force due to the engagement of the lead screw and the elastic member.
Since it is integrally connected by utilizing the adhesiveness of other oils, even if the stepping motor that advances and retracts the carriage is downsized, and the motor torque becomes smaller accordingly, the vertical vibration of the carriage does not occur. The magnetic head can be damped in an early stage to stabilize the contact between the magnetic head and the magnetic disk after the seek, and the settling time of the magnetic head can be greatly shortened as compared with the conventional case.

〔Example〕

The present invention will be described below with reference to one embodiment of the drawings. FIG. 1 most characteristically represents the present invention. FIG. 3 is a vertical cross-sectional view taken in the direction of arrow B in FIG. 3, FIG. 2 is a plan view showing the overall configuration of the device of the present invention, FIG. 3 is an enlarged view of part A of FIG. 2, and FIG. Further, FIG. 3 is a vertical sectional view of the rail shown by reference numeral 19, and FIG. 5 is a vertical sectional view showing an engaged state of the lead screw and cam spring 18 shown by reference numeral 15 in FIG.

In FIG. 2 showing the overall configuration of the device of the present invention, 1 is a chassis, a panel 2 is mounted on the front surface of the chassis 1, and a knob 4 is attached to the tip of a shaft 3 penetrating the panel 2. Has been. Then, when the knob 4 is rotated 90 ° from the state shown in FIG. 2, the lever 5 is pushed down toward the chassis 1 by the cam integrally formed with the shaft 3. The beam 6 that supports the shaft 3 and the lever 5 is screwed onto a rib provided on the edge of the chassis 1.

Reference numeral 7 denotes a carriage, and a metal 8 is fixed to the bottom surface of the carriage 7 as shown in FIG. 1, and a guide shaft 9 penetrates the metal 8. That is,
The metal 8 and the guide shaft 9 are kept slidable, and the guide shaft 9 is screwed to the chassis 1 via the shaft retainer 10.

Reference numeral 11 denotes a head arm, and an arm holder 12 is fixed to the tip of the head arm 11.
The arm spring 13 is pressed by the arm spring 13. Reference numeral 14 is a stepping motor, and the stepping motor 14 is fixed to the chassis 1 via a mounting plate 16. 15 is a lead screw, and lead screw 15 is a stepping motor 14
It rotates integrally with the rotor. The lead screw 15 is provided with a V groove 15a as shown in FIG.
A cam spring 18 (FIG. 1) protruding from the carriage 7 via a spring holder 17 is press-engaged with the V-shaped groove 15a as shown in FIG.

In FIG. 3, which is an enlarged view of the portion A of FIG. 2, 19 is a rail, and the rail 19 is coated with grease. In the case of the illustrated embodiment, the cross-sectional shape of the rail 19 is
As shown in FIG. 4, it is H-shaped, and the surfaces having the opening are in contact with the chassis 1 and the carriage 7, respectively. Further, in the illustrated embodiment, the rail 19 is surrounded by a concave wall 1a provided at the bottom of the chassis 1 as shown in FIGS. 1 and 3, and the rail 19 is coated by the concave wall 1a. Prevents grease from scattering and positions the rails 19.

In the above structure, when the knob 4 is rotated after inserting the magnetic disk through the insertion opening of the panel 2, the magnetic disk is clamped by the collet 20 and at the same time, the head arm 11 that has been lifted up to that point via the arm holder 12 is reached. Is lowered according to the pressing force of the arm spring 13, and the magnetic head provided at the tip of the head arm 11 comes into contact with the magnetic disk. At the same time, by the drive motor (not shown) provided on the bottom rear surface of the charge 1. , The magnetic disk rotates. To move the magnetic head to an arbitrary track when reading or writing a record, use the stepping motor 14
Rotates by an arbitrary angle, and as shown in FIG. 5, the cam spring 18, which is pressingly engaged with the V groove 15a of the lead screw 15, is moved (seek) by the principle of screw.

By the way, at the time of the seek, the V groove of the lead screw 15
The cam spring 18 that is press-engaged with 15a is
Due to the pressure angle of the groove 15a, the vertical component force P as shown in FIG. 5 is received. By this vertical component force P, the carriage 7 receives a turning force in the direction of arrow Q about the guide shaft 9 as shown in FIG. 1, but all the force is received by the rail 19.
Accumulates a small amount of distortion in chassis 1 and carrier 7. Then, as described above, the force accumulated as strain is applied to the rail 19
If no grease is applied to the stepping motor,
Until 14 rotates after receiving the next drive pulse, that is, for an extremely short period, during the stop period until the carriage 7 starts moving again, the carriage 7 is reactively opened and the carriage 7 is moved in the direction of arrow Q. And acts to rotate in the opposite direction. Following this, when the stepping motor 14 receives the next pulse, the stepping motor 14 which receives this pulse and rotates rotates the carriage 7 again in the direction of the arrow Q in FIG. 5, and thereafter, When a drive pulse is further sent, the carriage 7 vibrates in the same number of cycles as the drive pulse of the stepping motor 14 by repeating the same operation as described above, and this vibration is caused by the vibration damping mechanism. In the case of a magnetic disk drive that is not equipped with, the settling time of the magnetic head may be 30 msec or more, and it is natural that the settling time of the magnetic head is 30 msec or more after the seek is completed. It takes a long time.

On the other hand, according to the present invention, the vibration of the carriage 7 in the direction of the arrow Q and in the opposite direction thereof is damped at an early stage to stabilize the contact between the magnetic head and the magnetic disk after the carriage seek, and eventually the magnetic force. The settling time of the head is greatly shortened as compared with the conventional one, and this will be described below based on the illustrated embodiment.

That is, as described above, during the seek operation by the carriage 7 having the magnetic head, the lead screen 15
The cam spring 18 press-engaged with the V groove 15a of
Due to the pressure angle of the V groove 15a, a vertical component force P as shown in FIG. 5 is received, and the vertical component force P causes the carriage 7 to rotate around the guide shaft 9 as shown in FIG. Although the rail 19 receives all the turning force in the direction, a slight strain is accumulated in the chassis 1 and the carriage 7.
Then, as described above, the force accumulated as distortion is such that when the rail 19 is not coated with grease, the stepping motor 14 receives the next drive pulse and rotates, that is, for an extremely short period of time. That being said, the carrier 7 is released reactively during the stop period until the carriage 7 starts moving again,
Although it acts so as to rotate the carriage 7 in the direction opposite to the arrow Q direction, in the present invention, the release of the strain is delayed for a moment due to the viscosity of the grease applied to the rail 19. Then, in the meantime, the stepping motor 14 receives the next drive pulse and rotates the carriage 7 again in the direction of the arrow Q in FIG. 1, so that vibration does not occur and thereafter,
When the driving pulse is further sent, the same operation as described above is repeated. Then, the stepping motor 14
When the last drive pulse is received and the rotation is stopped, there is sufficient time to release the strain of the carriage 7, but at this time, since the viscosity of the grease continues to be maintained, the release is gentle. It was confirmed that the magnetic head was not shock-excited, and the experiment confirmed that the settling time could be shortened to half or less as compared with the magnetic disk drive without the carriage vibration damping mechanism. In addition, the durability test results of equipment by applying grease,
That is, the durability test result by repeated use was also good.

Further, according to the present embodiment, in addition to the above effects, the sliding resistance of the carriage 7 does not increase, and the experimental values thereof are shown in Table 1.

Table 1 shows the sliding force of the carriage 7 and the adhesive force required to lift the carriage 7 around the guide shaft 9 after removing the cam spring 18 shown in the illustrated embodiment. Measured, Table 1
According to the figure, there is no great difference in the sliding force of the carriage 7 between the case where the grease is applied to the rail 19 and the case where the grease is not applied, but there is a great difference in the adhesive force.

In the illustrated embodiment, the case where grease is applied to the rail 19 has been illustrated, but there is no problem in using other oil instead of grease.

Further, if the rail 19 shown in the illustrated embodiment is formed of a plastic represented by oil-impregnated polyacetal or other oil-impregnated material, the oil application work on the rail 19 can be omitted when assembling the product.

Further, by integrating the rail 19 shown in the illustrated embodiment with the carriage 7 or with the chassis 1, it is possible to save the labor for incorporating the rail 19 into the chassis 1 during product assembly.

〔The invention's effect〕

The present invention is as described above, and as is clear from the description of the illustrated embodiment, the present invention is such that a carriage having a magnetic head is slidably supported by a guide shaft,
In a magnetic disk drive device including a stepping motor for moving the carriage forward and backward, an elastic member fixed to the carriage is press-engaged with a groove of a lead screw, and the carriage is located on the opposite side of the elastic member. Supported slidably by rails,
In addition, the carriage is configured to receive a turning force due to the engagement of the lead screw and the elastic member, and the carriage and the carriage supporting member are integrally coupled by utilizing the adhesiveness of grease or other oil. According to the present invention, in order to suppress the vibration of the carriage, a lateral pressure is applied to the guide shaft for carrying the carriage equipped with the magnetic head as described in JP-A-62-134870. No need to give.

That is, as described above, the magnetic head feeding mechanism described in Japanese Patent Laid-Open No. 62-134870 is effective because the torque of the stepping motor is overwhelmingly larger than the sliding force of the carriage as a load. However, according to the present invention, the elastic member fixed to the carriage is press-engaged with the groove of the lead screw, and the carriage is located on the side opposite to the elastic member and slidable by the rail. The carriage is supported, and the carriage is configured to receive a rotational force due to the engagement of the lead screw and the elastic member.
Since it is integrally connected by utilizing the adhesiveness of other oils, even if the stepping motor that advances and retracts the carriage is downsized, and the motor torque becomes smaller accordingly, the vertical vibration of the carriage does not occur. The magnetic head can be damped in an early stage to stabilize the contact between the magnetic head and the magnetic disk after the seek, and the settling time of the magnetic head can be greatly shortened as compared with the conventional case.

[Brief description of drawings]

FIG. 1 shows an embodiment of a magnetic disk drive device according to the present invention, and FIG. 1 shows the most characteristic feature of the present invention. FIG. Is a plan view showing the overall configuration of the device of the present invention, FIG. 3 is an enlarged view of part A of FIG. 2, FIG. 4 is a longitudinal sectional view of a rail shown by reference numeral 19 in FIGS. 1 and 3, and FIG. FIG. 4 is a longitudinal sectional view showing an engaged state of the lead screw indicated by reference numeral 15 in FIG. 1 and the cam spring 18. 1 ... Chassis, 7 ... Carriage, 9 ... Guide shaft, 14 ... Stepping motor, 15 ... Lead screw, 18 ... Cam spring, 19 ... Rail.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Hirayama 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Inside the Taga factory of Hitachi, Ltd. (56) References JP-A-61-172277 (JP, A) Kai 62-137775 (JP, A) JP 62-134870 (JP, A)

Claims (6)

(57) [Claims] 1. A magnetic disk drive apparatus comprising a stepping motor for slidably supporting a carriage on which a magnetic head is mounted by a guide shaft and for moving the carriage forward and backward, wherein an elastic member fixed to the carriage is With reference to the guide shaft, while pressingly engaging with the groove of the lead screw provided on one side thereof, the carriage has the guide shaft as a reference,
Located on the opposite side of the elastic member, slidably supported by rails interposed between the carriage and chassis,
In addition, the carriage is configured to receive a turning force due to the engagement of the lead screw and the elastic member based on the arrangement of the guide shaft, the lead screw, and the rail interposed between the carriage and the chassis. A magnetic disk drive device, wherein the magnetic disk drive device is integrally connected by the adhesiveness of grease, grease, and other oils. 2. A magnetic disk drive apparatus comprising a stepping motor for slidably supporting a carriage on which a magnetic head is mounted by a guide shaft and for moving the carriage forward and backward, wherein an elastic member fixed to the carriage is With reference to the guide shaft, while pressingly engaging with the groove of the lead screw provided on one side thereof, the carriage has the guide shaft as a reference,
The carriage is slidably supported on the chassis via a rail that is located on the opposite side of the elastic member and integrally connected to the lower portion of the carriage, and the carriage includes the guide shaft,
Based on the arrangement of the lead screw, the rail interposed between the carriage and the chassis, it is configured to receive the turning force by the engagement of the lead screw and the elastic member, and the adhesion of grease and other oil between the rail and the chassis. A magnetic disk drive device characterized by being integrally connected by means of. 3. A magnetic disk drive apparatus comprising a stepping motor for slidably supporting a carriage on which a magnetic head is mounted by a guide shaft and for moving the carriage forward and backward, wherein an elastic member fixed to the carriage is With reference to the guide shaft, while pressingly engaging with the groove of the lead screw provided on one side thereof, the carriage has the guide shaft as a reference,
The carriage is slidably supported on the chassis via a rail integrally formed on the upper side of the chassis and located on the opposite side of the elastic member, and the carriage is provided between the guide shaft, the lead screw, and the carriage and the chassis. Based on the arrangement of the intervening rails, the carriage and the rails are integrally coupled by the adhesiveness of grease or other oil as a structure for receiving a rotational force due to the engagement of the lead screw and the elastic member. Characteristic magnetic disk drive device. 4. A magnetic disk drive apparatus comprising a stepping motor for slidably supporting a carriage on which a magnetic head is mounted by a guide shaft and for moving the carriage forward and backward, wherein an elastic member fixed to the carriage is With reference to the guide shaft, while pressingly engaging with the groove of the lead screw provided on one side thereof, the carriage has the guide shaft as a reference,
The guide shaft, the lead screw, the carriage and the chassis are slidably supported by a rail formed of an oil-containing material, which is located on the opposite side of the elastic member and interposed between the carriage and the chassis. Based on the arrangement of the intervening rails, the carriage and the rails are viscously coupled by a rail made of an oil-containing material so as to receive rotational force due to engagement of the lead screw and the elastic member. Characteristic magnetic disk drive device. 5. The magnetic disk drive apparatus according to claim 4, wherein the oil-containing material forming the rail that serves as a seat for the carriage is oil-containing plastic. 6. The magnetic disk drive device according to claim 5, wherein the oil-containing plastic forming the rail that serves as a seat for the carriage is oil-containing polyacetal.