JPS63157379A - Head press-contact mechanism for disk device - Google Patents

Abstract

PURPOSE:To improve the working reliability of a disk device by constituting a head press-contact mechanism with a spindle motor serving as a drive source, an oscillating gear and a cam sequence gear. CONSTITUTION:When a spindle motor 1 is driven in a record/reproduction state, a cam sequence gear 10 is revolved via an oscillating gear 4. As a result, a cam lever 14 is turned against the force of a spring 15 and a head is pressed to a recording medium. At the same time the lever 14 is locked by a lock lever 24 to keep a state where the head is pressed to the recording medium. Then a head pressure contact release signal is delivered from a system controller after recording/reproducing operations. Then the magnetic force of a permanent magnet is eliminated with energization of an electromagnet 47 and a magnetic substance lever 37 is displaced to a lock release position. Then the lock state of the lever 14 is released with operation of the lever 24 and the lever 14 is reset to its original position by the force of the lever resetting spring 15. Thus the press contact state of the head is released against the recording medium. At the same time, the gear 4 is engaged again with the gear 10 via a stopper lever 31.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a head pressure contact mechanism of a disk device, that is, a mechanism for bringing a head into pressure contact with a recording medium (disk). In addition, when a head pressure contact signal is transmitted from the system controller, the head is reliably separated from the recording medium to prevent deformation of the recording medium.

[Six Features of the Invention] The present invention provides a head pressure contact mechanism for a disk device, which includes: a swing gear that is interlocked with the rotation of a spindle motor; a cam sequence gear that rotates in mesh with the swing gear; A cam lever that is rotated by the rotation of the cam sequence gear against the spring force of a lever return spring to press the head against the recording medium, and a lock lever that locks the cam lever with the head pressed against the recording medium. and a stopper lever that disengages the swing gear and the cam sequence gear when the cam lever is locked by the lock lever and engages the swing gear and the cam sequence gear when the cam lever is unlocked by the lob lever; a magnetic lever that displaces the lock lever to the unlock position;
Comprised of a permanent magnet that attracts the magnetic lever to the unlocked position, and an electromagnet that cancels the magnetic force of the permanent magnet and displaces the magnetic lever to the unlocked position,
During recording and playback, when the spindle motor is rotated, the cam sequence gear rotates via the swing gear, and the cam sequence gear drives the cam lever against the spring force of the lever return spring. The head is pressed into contact with the cam lever, and the lock lever locks the cam lever, and when a head pressure release signal is issued from the system controller, the magnetic force of the permanent magnet is canceled by the electromagnet, and the magnetic lever that is attracted to the permanent magnet is The lock lever can be operated to unlock the cam lever by the lock lever.

[Prior Art] A disk device that performs recording and reproduction by pressing a head against a recording medium is naturally provided with a hept pressure contact mechanism. However, if the head is left in pressure contact with the recording medium for a long time, the recording medium will deform and the recording
This may cause playback defects, etc. Therefore, the head pressure contact mechanism is required not only to simply press the head into contact with the recording medium during recording and reproduction, but also to have a function of separating the head from the recording medium at times other than recording and reproduction. Therefore, a head press-contact mechanism is known in which a plunger is used, and when the plunger is energized, a pad is displaced in the direction of the recording medium to press the recording medium against the head. The plunger must always be energized during recording and playback, resulting in large power consumption.

[Problems to be Solved by the Invention] Therefore, a head pressure welding mechanism that is driven by a spindle motor has been developed, but the spindle motor stops before the head pressure welding operation is completed due to a power outage, etc. Then, there was a problem that the head pressure contact mechanism stopped working.

The present invention has been made for the purpose of solving the above-mentioned conventional problems.

[Means for solving the problem] The head pressure welding mechanism includes a swing gear that is linked to the rotation of a spindle motor, a cam sequence gear that meshes with the swing gear and rotates, and a lever that is rotated by the rotation of the cam sequence gear. A cam lever that rotates against the spring force of a return spring to press the head against the recording medium, a lock lever that locks the cam lever with the head pressed against the recording medium, and the lock lever locks the cam lever. a stopper lever that disengages the swing gear and the cam sequence gear when the lock lever is released, and engages the swing gear and the cam sequence gear when the cam lever is unlocked by the lock lever; and a stopper lever that displaces the a lever to the unlock position A magnetic lever that allows
It consists of a permanent magnet that attracts the magnetic lever to the unlocked position, and an electromagnet that cancels the magnetic force of the permanent magnet and moves the magnetic lever to the unlocked position.

[Function] During recording and playback, when the spindle motor rotates, the cam sequence gear rotates via the swing gear, and the rotation of the cam sequence gear causes the cam lever to rotate against the spring force of the spring. The head is brought into pressure contact with the recording medium, and the cam lever is locked by a lock lever to maintain the state in which the head is brought into pressure contact with the recording medium.

When recording/playback is finished and a head pressure release signal is sent from the system controller, the electromagnet is energized, the magnetic force of the permanent magnet is canceled, the magnetic lever is moved to the unlock position, and the lock lever is operated. Then, the cam lever is unlocked by the lock lever. The cam lever, which has been unlocked by the lock lever, returns to its original position by the spring force of the lever return spring to release the head from pressure contact with the recording medium, and at the same time, the stopper lever causes the swing gear to mesh with the cam sequence gear again.

[Example 2] Next, a head pressure contact mechanism of the present invention will be explained with reference to the drawings. 1 is a spindle motor;
A gear 3 is attached to the rotating shaft 2. Reference numeral 4 denotes a swing gear that is linked to the rotation of the spindle motor l, and the swing gear 4 includes a large diameter gear 5, a small diameter gear 6 provided on the lower surface of the large diameter gear 5, and these large and small diameter gears 5. .6 is attached to the J-shaped swinging arm 7. The swing arm 7 is rotatably supported at its center by a shaft 8, and the large and small diameter gears 5.6 are rotatably attached to one end by a shaft 9. The large diameter gear 5 meshes with the gear 3 attached to the spindle motor 1, and the small diameter gear 6 meshes with a cam sequence gear described below. IO is a cam sequence gear rotated by the swing gear 4. The cam sequence gear 10 is attached to the shaft 8, and has a first cam 11 on its lower surface for driving a cam lever, which will be described next, and a second cam for driving a stopper lever.
A cam 12 is provided, and the small diameter gear 6 of the swing gear 4 meshes with gear teeth 13 provided on the peripheral edge. When the spindle motor 1 is rotated clockwise, the small diameter gear 6 meshes with the gear teeth 13, and the cam sequence gear 10 is rotated clockwise. 14 is caused by the rotation of the cam sequence gear 10.
This is a cam lever that presses the head against a recording medium (not shown) against the spring force of the lever return spring 15. The cam lever 14 is rotatably supported on a shaft 16, and has a shift lever pressing portion 17 on one end, and a lock lever engagement portion on the other end that engages with a lock lever described below. A pin 18 is provided, and a cam engagement pin 19 is provided between the lock lever engagement pin 18 and the shaft 16.
The circumferential surface of the cam engagement pin 19 is brought into contact with the circumferential surface of the first cam 11 of the cam sequence gear 10 by the spring force of the lever return spring 15. When the cam sequence gear lO rotates clockwise, the cam lever 14 is rotated counterclockwise by the first cam 11 and the cam engagement pin I9 against the spring force of the lever return spring 15. The inclined surface 17a of the lower surface of the shift lever pressing part 17 is displaced, and the one end side 20a of the shift lever 20 that is in contact with the inclined surface 17a is moved to the inclined surface 17a.
The shift lever 20 is rotated counterclockwise about the shaft 22, and a pad (not shown) provided on the other end is moved toward the recording medium. The recording medium is brought into pressure contact with the head. A lock lever 24 locks the cam lever 14 with the head pressed against the recording medium. The lock lever 24 is formed in a "shape, and its center portion is rotatably supported by a shaft 25, and a counterclockwise rotational force is applied by a torsion spring 26.
The cam surface 27 on the side is the lock lever of the cam lever 14.
It comes into contact with the engagement pin 18. The cam surface 27 includes a first cam surface 28 that rotates the lob lever 24 counterclockwise, and a second cam surface 29 that rotates the lock lever 24 clockwise. When the lock lever 24 moves on the first cam surface 28, the lock lever 24 rotates counterclockwise due to the spring force of the first cam surface 28 and the torsion spring 26, and the lock lever engagement pin 18 moves on the second cam surface. When moving 29,
The second cam surface 29 is pressed by the lock lever engagement pin 18, and the lock lever 24 is pressed by the torsion spring 2.
It rotates clockwise against the spring force of 6. Then, as described above, when the cam lever 14 is rotated counterclockwise by a predetermined angle and the head is brought into pressure contact with the recording medium,
The engagement between the second cam surface 29 and the lock lever engaging pin 18 is disengaged, and the lock lever 24 is rotated counterclockwise so that the end surface 30 that is continuous with the second cam surface 29 is moved from the lock lever.
It engages with the engagement pin 18 to lock the cam lever 14. 31 disengages the swing gear 4 and the cam sequence gear IO when the cam lever 14 is locked by the lock lever 24, and disengages the swing gear 4 and the cam sequence gear IO when the cam lever 14 is unlocked by the lock lever 24. This is a stopper lever that engages the The stopper lever 31 is formed in a V-shape, and is rotatably supported at the center by a shaft 32. A long hole 33 is provided at one end, and the swing arm 7 is inserted into the long hole 33. A bottle 34 provided at one end is slidably fitted, and a convex portion 35 is provided at the other end, and the convex portion 35 is connected to the second cam 12 of the cam sequence gear lO.
is in contact with the circumferential surface of the

When the cam sequence gear 10 rotates by a predetermined angle, the convex portion 35 is inserted into the concave portion 36 provided on the circumferential surface of the second cam 12.
The small diameter gear 6 and the gear teeth 13 of the cam sequence gear 10 are disengaged by rotating the swinging arm 7 clockwise about the shaft 8. 37 displaces (returns) the lock lever 24 to the unlock position.
It is a magnetic material lever for. The magnetic lever 37 is attached to the shaft 3
8, one end is rotatably supported, and the other end is attracted by a permanent magnet described below, and a coil spring 39 and a limiter spring 40 act on the magnetic lever 37. are doing. The coil spring 39 applies a clockwise rotational force to the magnetic lever 37, and when the magnetic lever 37 is released from the permanent magnet, the magnetic lever 37 is rotated clockwise. The cam lever 14 is unlocked by the lock lever 24 by pressing the r''o lever 24 on its negative side and rotating it clockwise.

Further, the limiter spring 40 is attached with a central ring portion 41 fitted to the shaft 38, and one end side 4
2 is locked to the magnetic lever 37, while the other end 43 is in contact with the first cam If of the cam sequence gear 10.

When the first cam 11 is rotated clockwise, the magnetic lever 37 is rotated counterclockwise against the spring force of the coil spring 39. 44
is a permanent magnet that attracts the magnetic lever 37 to the unlocked position. The permanent magnet 44 is disposed opposite to an iron attraction part 46 which is rotatably attached to one end of the magnetic lever 37 with a shaft 45, and as described above, the magnetic lever 37 is rotated counterclockwise. When the magnetic material lever 37 is rotated by a predetermined angle, the magnetic material lever 37 is set to the unlocked position by attracting the attracting portion 46. 47
cancels the magnetic force of the permanent magnet 44 and moves the magnetic lever 3
7 to the unlocked position. When a head pressure release signal is output from a system controller (not shown), a current flows through the electromagnet 47 in a direction that cancels the magnetic force of the permanent magnet 44, cancels the magnetic force of the permanent magnet 44, and locks the magnetic lever 37. Displace it to the release position, rotate the lock lever 24 clockwise using the magnetic lever 37, and release the cam lever I4 by the lock lever 24.
It is supposed to unlock. In addition, in FIG. 4, 23 is a disk cassette.

The disk pressure contact mechanism of the embodiment has the above-mentioned configuration, and when the spindle motor l rotates clockwise by pressing the record/playback button, the cam sequence gear lO is rotated clockwise via the swing gear 4. When the cam lever 14 rotates counterclockwise by the first cam 11 of the cam sequence gear 10, the shift lever is pushed by the inclined surface 17a of the shift lever pressing portion 17 provided at one end of the cam lever 14 and the set spring 21. 20 rotates counterclockwise,
A pad (not shown) provided at the other end of the shift lever 20 is moved toward the recording medium to press the recording medium against the head. On the other hand, when the cam lever 14 rotates counterclockwise,
The lock lever engagement pin I8 provided at the other end of the cam lever 14 moves clockwise along the cam surface 27 of the lock lever 24, and the first cam 28 and torsion spring 26 rotate the lock lever 24. Rotate clockwise,
The magnetic lever 37 is rotated counterclockwise using the lock lever 24, so that the attraction portion 46 provided at one end of the magnetic lever 37 is attracted to the permanent magnet 45.

When the lock lever engaging pin 18 further moves clockwise and comes into contact with the second cam surface 29, the lock lever 24 is rotated clockwise by the lock lever engaging pin 18. When the lock lever engagement pin I8 is disengaged from the second cam surface 29, the lobe lever 24 rotates counterclockwise, and the cam lever 14
As mentioned above, the head is kept in pressure contact with the recording medium.

Then, when recording and reproduction are finished and the head pressure contact release signal causes current to flow through the electromagnet 47 and cancel the magnetic force of the permanent magnet 45, the magnetic lever 37 rotates clockwise and is displaced to the lock release position. Since the cam lever 14 is unlocked by the lock lever 24, the cam lever 14 is returned by the spring force of the lever return Q spring 15, and the inclined surface 17a of the shift lever suppressing portion 17 provided at one end of the cam lever 14 pushes the shift lever. -20 is pressed against the spring force of the set spring 21, and the shift lever 20 is rotated clockwise to release the head from pressure contact with the recording medium.

[Effects of the Invention] As explained above, the present invention uses a spindle motor as a drive source and configures a head pressure contact mechanism using a swing gear and a cam sequence gear. This has the advantage that there is no adverse effect, and even if the spindle motor stops midway, there is no functional problem, and a reliable head pressure contact mechanism can be achieved.

[Brief explanation of the drawing]

Figure 1 is a plan view of the spindle motor rotating with the magnetic lever moved to the unlock position;
Figure 2 is a plan view of the state in which the magnetic lever is attracted to a permanent magnet by the rotation of the spindle motor, and Figure 3 is a plan view of the state in which the cam lever is moved to the lock lever with the head in pressure contact with the recording medium.
Figure 4 is a side view, Figure 5 is a side view of the joint between the cam lever and shift lever, and Figure 6 shows the swing gear and cam sequence gear removed and turned over. FIG. l... Spindle motor, 4... Swing gear, IO・
...Cam sequence gear, 14...Cam lever, 15
...Lever return spring, 24...Lock lever
131... Stopper lever, 37... Magnetic lever, 44... Permanent magnet, 47... Electromagnet.

Claims (1)

[Claims] (1) A swing gear that is linked to the rotation of the spindle motor,
a cam sequence gear that rotates in mesh with the swing gear;
A cam lever that rotates against the spring force of a lever return spring by rotation of the cam sequence gear to press the head against the recording medium, and a lock lever that locks the cam lever in a state in which the head is pressed against the recording medium. , a stopper lever that disengages the swing gear and the cam sequence gear when the cam lever is locked by the lock lever and engages the swing gear and the cam sequence gear when the cam lever is unlocked by the lock lever; A magnetic lever that displaces the lock lever to the unlocked position; a permanent magnet that attracts the magnetic lever to the non-locked position; and a permanent magnet that cancels the magnetic force of the permanent magnet to move the magnetic lever to the unlocked position. A head pressure contact mechanism for a disk device comprising an electromagnet for displacement.