JPH0710835U - Magnetic disk device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a magnetic disk device in which a magnetic head or the like does not accidentally contact the magnetic disk when the magnetic disk is ejected. A chucking mechanism 8 for holding a magnetic disk 50 on a spindle hub 33, and a head elevating mechanism for elevating a head unit 10 having a magnetic head 107 for recording / reproducing signals on the surface of a disk 51. In the provided magnetic disk device, the chucking mechanism 8 includes a first swing arm 23 that rotates in association with the operation of the eject lever 20 and a collet 31 fixed to the tip of the first swing arm 23. The elevating mechanism includes a second swing arm 24 that rotates by being engaged with the first swing arm 23, and a support shaft 26 of the second swing arm 24.
Is located closer to the center of the magnetic disk 50 than the support shaft 25 of the first swing arm 23, and the rotation angle of the second swing arm 24 is set to be larger than the rotation angle of the first swing arm 23. Magnetic disk device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic disk device such as a personal computer and a word processor, and more particularly to a structure of a magnetic disk chucking mechanism peripheral portion.

[0002]

[Prior art]

 As is well known, a so-called magnetic disk device is used for recording information on a floppy disk composed of a flexible rotating magnetic disk or reading the recorded information. Since there are multiple types of disks such as 8 inch, 5.25 inch, 3.5 inch, etc., the floppy disk that can be used by the magnetic disk device is specified.

FIG. 5 shows a conventional 5-inch magnetic disk device. A 5-inch magnetic disk 50 used in this magnetic disk device is a disk-shaped disk 51 having a circular hole 51a formed in the center thereof. It is housed in a disk case 52 in a rotatable state.

That is, a circular opening 52a is formed in the center of the disk case 52, and the peripheral edge of the hole 51a of the disk 51 is exposed to the outside through the opening 52a, and the front and lower surfaces of the front part of the disk case 52 are exposed. An opening window 53 for sliding a magnetic head, which will be described later, onto the disk 51 is formed therein, and an index detecting hole 54 of the magnetic disk 51 is formed near the opening 52a.

In the magnetic disk device 100, a chassis is constructed by assembling a bottom side main frame 103 and a top side subframe 104 to the left and right side frames 101 and 102, and the main body of the chassis is constructed. Various mechanical parts, a printed circuit board, electronic components and the like are fixed to the frame 103 and the subframe 104.

Then, the magnetic disk 50 can be inserted into the magnetic disk device 100 through the insertion opening of the front bezel 105 on the front surface. The magnetic disk device 100 includes a chucking mechanism 106 for holding the disk 51 of the magnetic disk 50 at a predetermined position, and a head unit having a magnetic head 107 for recording / reproducing on the surface of the disk 51, that is, a recording surface. 108, a head sliding mechanism 109 for sliding the head portion 108 in the direction of the arrow B toward the center of the disk 51, and the chucking mechanism 106 is operated by rotating the eject lever 110 and the head portion 108 is rotated. A swing arm 112 for contacting and separating from the surface of the disc 51 is provided.

The head portion 108 is configured by connecting a rear portion of the upper carriage 108a and a rear portion of a lower carriage (not shown) with a leaf spring 113, and a torsion spring 114 hung on the upper portion of the head portion 108. Since the upper carriage 108a is biased downward by the hook, and the protruding piece formed on the side of the upper carriage 108a engages with the upper surface of the swing arm 112, the head portion 108 is attached to the sub-frame 104. It can rotate according to the rotation of the swing arm 112 supported.

The head sliding mechanism 109 includes a traveling member 117 engaged with the spiral groove 116 a of the lead screw 116 rotated by the stepping motor 115, and a traveling guide member 119 slidably mounted on the guide shaft 118. Composed.

A cam member 120 is fixed to the tip end portion of the rotation shaft of the eject lever 105, and a swing arm 112 biased upward by a spring 121 is elastically contacted with the cam surface of the cam member 120 to eject the eject member 105. The swing arm 112 rotates in response to the rotation operation of the lever.

The chucking mechanism 106 described above includes a collet 123 attached to the center of a support plate 122 fixed to the tip of a swing arm 112, and a spindle (not shown) arranged below the collet. And a spindle motor 124 that rotationally drives the spindle.

Since the conventional magnetic disk device has such a structure, when ejecting the magnetic disk 50, when the eject lever 105 is rotated, the collet 123 of the swing arm 112 is lifted upward. Therefore, the collet 123 of the chucking mechanism 106 is pushed upward, but the upper carriage 108a that engages with the swing arm 112 is also pushed upward at the same timing, and the magnetic disk 50 is ejected by an ejecting mechanism (not shown). To be done.

[0012]

[Problems to be solved by the device]

 However, in the above-described conventional magnetic disk device, the collet 123 and the upper carriage 108a are moved up and down by the swing arm 112 pivotally supported by the sub-frame 104, so that the collet 123 moves toward and away from the spindle and the disc surface. The contacting / separating operation of the magnetic head 107 with respect to is performed almost simultaneously.

Therefore, when the magnetic disk 50 is ejected, the collet 123 rises before the magnetic head 107 is completely lifted, and the holding of the disk is released. In such a case, the magnetic disk 107 is released. When the magnetic field is ejected, the magnetic head 107 may be caught by the ejected disk case 52 and the head portion 107 may be damaged.

In view of the problems of the conventional magnetic disk device as described above, an object of the present invention is to obtain a magnetic disk device in which the magnetic head or the like does not accidentally contact the magnetic disk when the magnetic disk is ejected. is there.

[0015]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention lifts and lowers a chucking mechanism for holding a magnetic disk on a spindle hub and a head unit having a magnetic head for recording / reproducing signals on / from the surface of the magnetic disk. In a magnetic disk device including a head elevating mechanism, the chucking mechanism includes a first swing arm that rotates in conjunction with the operation of an eject lever, and a collet fixed to the tip of the first swing arm. The head lifting mechanism includes a second swing arm that is rotated by being engaged with the first swing arm, and the support shaft of the second swing arm is located closer to the magnetic field than the support shaft of the first swing arm. The magnetic disc is located on the center side of the disc and the rotation angle of the second swing arm is set to be larger than the rotation angle of the first swing arm. It is intended to propose a device.

[0016]

[Action]

 Therefore, according to the magnetic disk device of the present invention having such a structure, the collet for holding the magnetic disk is fixed at the turning angle on the side of the second swing arm for contacting and separating the head portion with the magnetic disk. Since the rotation angle of the first swing arm is made larger than that of the collet, the head is raised faster than the collet is raised, and after the head is completely raised, the collet holds the magnetic disk. In the process of ascending the head, the magnetic disk is still restrained by the collet, the magnetic disk is not ejected carelessly, and the magnetic head is not damaged. It can be avoided.

Further, since the leaf spring is fixed to the tip end portion of the first swing arm and the collet is attached via the leaf spring, the dimension of the chucking mechanism in the height direction is reduced and the thickness of the magnetic disk device is reduced. The size can be reduced.

[0018]

【Example】

 1 to 4, the details of the embodiment of the present invention will be described below.

FIG. 1 is a top view showing a state in which a top cover of a 5-inch magnetic disk device according to the present invention is removed, and FIG. 2 is an exploded perspective view showing a main part of the magnetic disk device according to the present invention.

The magnetic disk device 2 constitutes a chassis mounted on the left and right side frames 3a, 3b with a spacer 4 interposed between a main frame 5 on the bottom surface and a sub-frame 6 on the upper surface. The main frame 5 and the sub frame 6 of the chassis are assembled with various mechanical parts, a printed circuit board, electronic components and the like.

In the magnetic disk device 2, a magnetic disk 50 is inserted from an insertion opening of a front bezel 1 attached to the front surface. A spindle hub for rotating the magnetic disk 50 by a spindle motor. A chucking mechanism 8 held by 33, a head elevating mechanism for elevating and lowering a head unit 10 having a magnetic head 9 for recording a predetermined signal on the upper and lower surfaces of the disk 51 and for reading the recorded signal, and a head unit 10. The head sliding mechanism 11 that slides the disk in the direction of arrow A toward the center of the disk 51, the first swing arm 23 that operates the chucking mechanism 8 of the magnetic disk 50 by the operation of the eject lever 20, and the head unit 10. A second swing arm 24 and the like for contacting with and separating from the surface of 51 are provided.

In the head portion 10, the rear portion of the upper carriage 12 and the rear portion of the lower carriage (not shown) are connected by a leaf spring 13, and the upper surface of the upper carriage 12 is lowered by one hook of the torsion spring 14. Is pressed by. Then, the protruding piece 12a formed on the side of the upper carriage 12 engages with the upper surface of the second swing arm 24, and the vertical swing can be performed according to the vertical movement of the second swing arm 24. There is.

The head sliding mechanism 11 includes a traveling member 17 engaged with a spiral groove of a lead screen 16 rotated by a stepping motor 15 and a traveling guide member 19 slidably mounted on a guide shaft 18. Composed.

The chucking mechanism 8 is provided with a first swing arm 23 that moves up and down in conjunction with the operation of the eject lever 20 and a collet 31 fixed to the tip of the first swing arm 23. The mechanism includes a second swing arm 24 that vertically moves by engaging with an engagement piece 23a formed on a side edge of the first swing arm 23. The first swing arm 23 and the second swing arm 24 is pivotally supported on the sub-frame 6 via supporting shafts 25 and 26, and the tip ends thereof are pushed upward by coil springs 27 and 28.

Here, the support shaft 26 of the second swing arm 24 for raising and lowering the head unit 10 is installed so as to be located closer to the center side than the support shaft 25 of the first swing arm 23. The rotation angle of the second swing arm 24 side engaged with this is set to be larger than the rotation angle of 23. Further, a leaf spring 23b is fixed to the engaging piece 23a of the first swing arm 23 so that when the first swing arm 23 descends and holds the magnetic disk, it makes elastic contact with the second swing arm 24. It has become.

A leaf spring 29 is fixed to the tip end portion of the first swing arm 23, and a collet 31 is attached to a support plate 30 assembled to the leaf spring 29. An operating pin 22 is provided at the rear end of the first swing arm 23 so as to project. The operating pin 22 is in contact with an inclined cam 21 integrally formed in the middle of the eject lever 20.

The inclined cam 21 is formed with a first cam surface 21a having a steep slope, a second cam surface 21b having a gentler slope than the first cam surface 21a, and a flat upper end surface 21c. , The operating pin 22 of the first swing arm 23 moves up and down along the cam surface of the inclined cam 21 in association with the sliding operation of the eject lever 20, so that the collet 31 side of the tip end of the first swing arm 23 is moved. Along with raising and lowering, the second swing arm 24 is also raised and lowered at a predetermined timing.

A spindle hub 33, which is driven to rotate by a spindle motor 32, is provided on the main frame 5 facing the collet 31, and as shown in FIG. The peripheral edge of the hole 51a of the magnetic disk 51 is held by the upper end surface 33a of the spindle hub 33.

A magnetic disk 50 index hole detection sensor 34 is installed on the left side of the upper surface of the sub-frame 6, and the detection hole 34 of the inserted magnetic disk 50 is detected by the detection sensor 34. Then, the rotational position of the disk 51 is detected.

Further, at the four corners of the sub-frame 6, mounting pieces 35 for mounting another magnetic disk device on the upper surface of the upper surface cover of the magnetic disk device 2 are formed. The mounting piece 35 is bent vertically upward so that various mechanical parts on the upper surface of the sub-frame 6 do not interfere with each other, and the upper end surface is bent horizontally to form a screw hole 35a into which a fixing screw is fastened.

Next, the operation of the magnetic disk device configured as described above will be described with reference to FIGS. 4 (a) and 4 (c). First, when the magnetic disk 50 is inserted into the magnetic disk device 2, the eject lever 20 is unlocked, and the eject lever 20 slides toward the front side by the return coil spring, and the inclined cam 21 of the eject lever 20 is released. The actuating pin 22 of the first swing arm 23, which is elastically contacted with the upper end of the first swing arm 23, climbs along the cam surface of the tilting cam 21 and rides on the upper end surface thereof, and the collet 31 side of the first swing arm 23 resists the spring 27. And push down. Further, in this process, the leaf spring 23b fixed to the protruding piece 23a of the first swing arm 23 engages with the upper surface of the second swing arm 24, and the other end side of the second swing arm 24 resists the spring 28. And is pushed down.

At this time, while the operating pin 22 elastically contacting the inclined cam 21 of the eject lever 20 moves up along the first cam surface 31a, as shown in FIGS. 4 (c) and 4 (b), The collet 31 of the first swing arm 13 is lowered and brought into contact with the spindle. Further, as shown in FIG. 4B, while the actuating pin 22 moves upward from the first cam surface 21a to the second cam surface 21b, the collet 31 is brought into contact with the spindle hub 33, and then further. When the collet 31 is lowered, the taper portion of the collet 31 penetrates the central opening of the hole 51 a of the magnetic disk 50 and fits into the recess of the spindle hub 33 to center the magnetic disk 50.

Further, when the operating pin 22 rides on the upper end surface 31c of the inclined cam 21, the collet 31 is further pushed down by the elastic force of the leaf spring 29, and the pressing force for holding the floppy disk 50 is reduced. Since it is obtained, as shown in FIG. 4A, the flange portion 31a of the collet 31 and the upper end surface 33a of the spindle hub 33 sandwich the peripheral edge portion of the hole 50a of the magnetic disk 50.

When the first swing arm 23 is pushed down, the engaging piece 23 a of the first swing arm 23 comes into contact with the second swing arm 24 with a slight time delay, and the second swing arm 24 is moved to the spring 28. The head portion 10 engaged with this can be brought into contact with the surface of the magnetic disk 50.

On the other hand, when ejecting the magnetic disk 50 from the magnetic disk device 2, the eject lever 20 is pushed in to cause the eject lever 20 to slide backward, and the operating pin 22 of the first swing arm 23 is The eject lever 20 descends along the inclined surface of the inclined cam 21, and the collet 31 side of the first swing arm 23 is pushed upward and the head side of the second swing arm 24 is also pushed upward.

Here, when the magnetic disk is ejected, when the operating pin 22 of the first swing arm moves from the upper end surface 21c of the tilt cam 21 to the second cam surface 21b, as shown in FIG. 4B, Even if the first swing arm 23 slightly rotates, the collet 31 is not separated from the spindle hub 33 due to the bending of the leaf spring 29 to which the collet 31 is attached. However, since the second swing arm 24 has a large rotation angle, The upper carriage 12 of the head unit 10 is completely separated from the surface of the magnetic disk 50.

When the operating pin 22 moves from the second cam surface 21b of the inclined cam 21 to the first cam surface 21a, as shown in FIG. 4C, the first swing arm 23 and the second swing arm 24 are moved. Is pushed up to the maximum, the chucking of the magnetic disk 50 is released later than the magnetic head portion 10 by the amount of bending of the leaf spring 29, and the magnetic disk 50 is ejected from the insertion opening of the front bezel 1 by an ejection mechanism (not shown). It

That is, when the magnetic disk 50 is ejected, since the rotation angle of the second swing arm 24 is larger than the rotation angle of the first swing arm 23, the first swing arm 23 is slightly raised. However, since the magnetic disk 50 is still chucked by the collet 31 and the collet 31 is released after the head portion 10 is completely separated from the magnetic disk 50, damage to the head portion can be eliminated. .

[0039]

[Effect of device]

 As is clear from the above description, according to the magnetic disk device of the present invention, the chucking mechanism for holding the magnetic disk includes the first swing arm that moves up and down in conjunction with the operation of the eject lever, and the first swing arm. A second swing arm that moves up and down by being engaged with the first swing arm, and the spindle of the second swing arm that raises and lowers the head portion is located closer to the center than the spindle of the first swing arm. Since the rotation angle of the second swing arm side is set to be larger than the rotation angle of the first swing arm, even if the first swing arm is slightly raised when the magnetic disk is ejected. , The magnetic disk is still chucked by the collet, and the collet is released after the head part is completely separated from the magnetic disk. There never magnetic disk is inadvertently discharged, it is possible to prevent damage to the magnetic heads.

Further, since the leaf spring is fixed to the tip end portion of the first swing arm and the collet is attached to the support plate assembled to the leaf spring, the chucking mechanism of the magnetic disk can be kept low and The overall thickness of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a top view showing a 5-inch magnetic disk device according to the present invention with a top cover removed.

FIG. 2 is an exploded perspective view showing a main part of a magnetic disk device according to the present invention.

FIG. 3 is a sectional view showing a main part of a chucking mechanism of a magnetic disk.

FIG. 4 is a chucking mechanism for holding a magnetic disk,
FIG. 6 is an explanatory diagram of operation timing with a head elevating mechanism that moves a head unit to and from a disk surface.

FIG. 5 is a top view showing a state in which a top cover of a conventional 5-inch magnetic disk device is removed.

[Explanation of symbols]

 2 magnetic disk device 6 sub-frame 8 chucking mechanism 10 head part 12 upper carriage 20 eject lever 21 tilt cam 22 actuating pin 23 first swing arm 24 second swing arm 25 axis 26 axis 27 spring 28 spring 29 leaf spring 31 collet 33 Spindle hub 50 magnetic disk

Claims (2)

[Scope of utility model registration request] 1. A magnetic device comprising a chucking mechanism for holding a magnetic disk on a spindle hub, and a head elevating mechanism for elevating and lowering a head portion having a magnetic head for recording and reproducing signals on the surface of the magnetic disk. In the disk device, the chucking mechanism includes a first swing arm that rotates in association with the operation of an eject lever, and a collet fixed to the tip of the first swing arm, and the magnetic head lifting mechanism includes A second swing arm that engages with the first swing arm and rotates; and a support shaft of the second swing arm is positioned closer to a center side of the magnetic disk than a support shaft of the first swing arm is. Second
A magnetic disk device, wherein a swing angle of a swing arm is set to be larger than a swing angle of the first swing arm. 2. The magnetic disk drive according to claim 1, wherein a leaf spring is fixed to a tip end portion of the first swing arm, and a collet for holding a magnetic disk is attached to the leaf spring.