JPH06103731A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the vibration due to clamping and to prevent a clamped disk from affecting a using disk by making it impossible to insert or clamp one magnetic disk during another magnetic disk is written or erased in a single magnetic disk device which deals with magnetic disks of different kinds at the same time. CONSTITUTION:When one magnetic disk is written or erased, a solenoid 301 is driven by a signal from a write gate or an erasing gate and an actuater is rotated in the direction of an arrow (d), then a lock lever 302 is pushed so as to projecting in the path for magnetic disk inserting. Consequently, the recording medium of the another magnetic disk is prevented from inserting, then the vibration due to inserting is prevented and the affection to the using disk is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device for recording or reproducing information on a magnetic disk.

[0002]

2. Description of the Related Art As a recording / reproducing apparatus of this type, there is a floppy disk drive (hereinafter referred to as FDD) for magnetically recording or reproducing information on a flexible magnetic disk, so-called floppy disk (hereinafter referred to as FD). Although the development of OA equipment has been remarkable in recent years, along with this, the FDD as an external storage device is also becoming smaller and larger in capacity. Also, the FDs used for these are standardized to 8 inch, 5.25 inch and 3.5 inch FD,
It is now widespread.

[0003]

Although a personal computer or the like often uses two FDDs, the same FDD is used.
When two D's are provided side by side, a large space is consumed, and in each FDD, the drive motor for driving the FD consumes electric power, which results in large power consumption.

Further, in order to solve the drawback that the power consumption is large, in JP-A-58-212375, a single drive motor is commonly used to drive the same FDD to drive the FDD.
A dual FDD that drives D to rotate has been proposed.
Further, in order to record and reproduce different FDs by the same driving device, in JP-A-3-165388, different FDs, that is, 5.25-inch FD and 3.5-inch FD, are shared by a single drive source. F to enable driving with a single device
DD devices have been proposed.

In the dual FDD as described above, for example, the 3.5 inch side is 5.2 during writing or erasing.
When a 5-inch FD was inserted, there were serious drawbacks such as incorrect data being written on the 3.5-inch side due to vibrations at that time, and the inability to erase data accurately.

Therefore, an object of the present invention is to provide a single magnetic disk device which simultaneously handles different kinds of magnetic disks, and whether one magnetic disk cannot be inserted while the other magnetic disk is being written or erased. Another object of the present invention is to provide a magnetic disk device that can prevent vibration and the like during clamping even when inserted.

[0007]

In order to achieve the above-mentioned object, the present invention provides drive mechanisms for driving magnetic disks of different types and loadings for loading the magnetic disks at recording / reproducing positions. In a magnetic disk device in which a mechanism and magnetic head mechanisms for recording / reproducing information to / from each magnetic disk are arranged in parallel in a single device, when one magnetic disk is recording or erasing, the other The magnetic disk device is characterized in that it has means for making the magnetic disk incapable of being inserted or clamped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the appearance of the entire FDD of the present invention. This FDD body 1 is a 3.5-inch FD200
FDD for recording / playback and 5.25 inch FD210
It is configured as a combination of FDD for recording and reproduction. Reference numeral 2 is an exterior cover, which is an FDD.
A front panel 3 is attached to the front surface of the main body 1, and the panel 3 is provided with an insertion opening 4 for inserting a 3.5-inch FD and an eject button 7 for ejecting the disc. . In addition, the front panel 3 has a display LED for displaying the operating state of each FDD.
(Light emitting diodes) 8 and 9 are attached.

FIG. 2 is a top view with the exterior cover 2 shown in FIG. 1 removed, and FIG. 3 is a front view thereof.
In this embodiment, the 5.25-inch FDD portion is arranged in a state of being turned over from the normal posture, and the 3.5-inch FDD portion is arranged so as to be mounted on the 5.25-inch FDD portion. . First, the 3.5-inch FDD section will be described with reference to FIGS. 2, 4, and 7.

The base 11 of the 3.5-inch FDD section is
The base 10 of the 5.25-inch FDD part is
The three mounting portions 12 provided on the base 10 are fixed to the base 10 with screws 13, respectively. The base 11 is made of a box-shaped metal plate formed by press-forming the rising portions 11a, 11b, 11c, and various mechanisms are mounted on it.

A 3.5-inch FD200 is provided in the base 11.
A cassette guide 14 for guiding the 3.5-inch FD is mounted on the base 11 so as to be able to move up and down when inserting, ejecting, loading to a recording / reproducing position, and unloading to a standby position. The cassette guide 14 is 3.5 inches F
It has a shape suitable for guiding and holding the D200, and guide pins (not shown) are provided on both sides thereof. On the other hand, cassette guides 14 are provided on both sides of the base 11.
Is formed with a vertical guide groove (not shown) into which a guide pin (not shown) is slidably fitted in the vertical direction, and the cassette guide 14 extends in the vertical direction along the vertical guide groove.
It is mounted so that it can be moved to the standby position and recording / playback position.

A shutter lever 16 is swingably supported on a vertical shaft 15 provided on the cassette guide 14. This shutter lever 16 is a 3.5 inch FD200
Is for opening and closing the shutter 201c of the 3.5-inch FD 200, and a shutter pin 17 engageable with the edge of the shutter 201c is provided on the lower surface of the front end portion thereof. In addition, the shutter lever 1
6 is a spring 18 stretched between the cassette guide 14 and
Is urged in the clockwise direction in FIG. The cassette guide 14 is provided with a stopper 19 for restricting the position of the shutter lever 16 when the 3.5-inch FD is not inserted, and the shutter lever 16 has a 3.5-inch F.
A stopper 20 is provided to regulate the position when D is inserted.

FIG. 4 is an enlarged plan view showing a state where the cassette guide 14 is removed from the disk device shown in FIG. Below the cassette guide 14, a slide plate 21 having a cam portion for restricting the left and right positions of the cassette guide and for moving the cassette guide up and down is mounted. The cam portions are formed on the rising portions 22 on the both sides of the slide plate 21 (two portions on each of the left and right sides). The slide plate 21 is mounted in the base 11 so as to be slidable within a predetermined range in front, rear, left and right.

A disk-shaped pulley 23, which will be described later, is arranged substantially in the center of the bottom surface of the base 11, and the pulley 23 is connected via a belt 24 to a spindle 25 that rotationally drives the 3.5-inch FD 200. The slide plate 21 includes the pulley 23, the belt 24, and the spindle 25.
In order to avoid the above, the central portion is cut out, and the elongated holes 28 which engage with the four positioning pins 26a, 26b, 27a, 27b provided on the base 11 are provided on the left and right sides thereof.
a, 28b, 29a, 29b are formed. These elongated holes allow the slide plate 21 to move back and forth by a predetermined distance. The slide plate 21 is attached to the base 11 by a slide spring 30 stretched between the base 11 and the arrow B in FIG.
Is always biased in the direction and can engage with a latch lever 31 which will be described later. In the latched state, it is in a rear position against the slide spring 30 (position shown in FIG. 4).
Held in.

A cam groove (not shown) is provided for raising and lowering the cassette guides 14 on the rising portions 22 (two places on each of the left and right sides) of the slide plate 21 and for determining the position of the slide plate according to the vertical position of the cassette guides. ) Has been formed. By the engagement of the cam groove (not shown) and the guide pin (not shown), the cassette guide 14 is held at the standby position when the slide plate 21 is at the rear, and the latch lever 31 is released to release the cassette guide 14. When the slide plate is moved in the direction of arrow A by the slide spring 30, the cassette guide 14 is lowered to the recording / reproducing position. 3.5 inch FD
When the 200 is ejected from the recording / reproducing position through the standby position, the eject button 5 attached to the slide plate 21 is pushed to operate, the slide plate is moved to the rear position, and the latch lever 31 is moved by the spring force. And then rotate it back, and the torque is 3.5 inch FD200
Is discharged to the front.

The latch lever 31 is rotatably mounted around a shaft 32 provided on the base 11, and is constantly biased counterclockwise by a spring 33 engaged with the latch lever and the base. Has been done. This latch lever 3
1 is formed with an engaging edge 31a and an engaging edge 31b of a partially arcuate portion. In the latched state, the slide plate 21
The engaging portion 21a formed in the above is engaged with the engaging edge 31b, and the slide plate is held at the rear position against the slide spring 30. Further, the latch lever 31 is integrally provided with a pushing arm portion 31c that comes into contact with the front end portion of the 3.5-inch FD 200. The push-out arm portion 31c functions as an ejector that receives the biasing force of the spring 33 and pushes out the 3.5-inch FD when the cassette is ejected. In the latched state of the latch lever 31,
When the 3.5-inch FD 200 is inserted, the front end of the cassette comes into contact with the push-out arm portion 31c, and when the latch lever 31 rotates clockwise against the biasing force of the spring 33 by pushing in the cassette, The engaging portion 21a of the slide plate 21 is disengaged from the engaging edge 31b of the latch lever 31, the slide plate 21 is moved in the direction of arrow B by the slide spring 30, and the 3.5-inch FD 200 is set at the recording / reproducing position. It becomes the wearing state. Further, the moved slide plate 21 engages with the engaging edge 31a of the latch lever 31 and is locked at a predetermined position.

In FIG. 4, a media-in switch 34 and a write protect switch 35 for detecting the insertion of a cassette are arranged near the insertion slot, and an HD detection switch 36 for detecting the type of recording medium is provided on the opposite side. Are arranged. These switches are the above-mentioned display LEDs 8
And it is connected to one PCB (printed circuit board) 37 including an index detecting Hall element 338 which will be described later. Further, the PCB 37 is connected to a PCB 52 described later by a cable.

Referring again to FIG. 2, the head moving means is provided in the base 11. The head moving means includes a pair of upper and lower magnetic heads, a head carriage 43 that supports the heads, a guide bar 48 that guides the head carriage 43, and a lead screw 40 that moves the head carriage 43 to a predetermined position. Stepping motor 38 for rotating the lead screw 40
It consists of and.

Explaining this structure in detail, the stepping motor 38 is fixed to a substantially U-shaped ST motor bracket 39, and a lead screw 40 is connected to the output shaft of the stepping motor 38. The other end of the lead screw is rotatably supported by a pivot bearing attached to the ST motor bracket. Also,
The ST motor bracket 39 is supported on the base 11 by a plurality of pins 41 so that the ST motor bracket 39 can be adjusted in the front-rear direction, and is fixed by screws 42 after the adjustment. A lead pin 44 provided integrally with the head carriage 43 is engaged with the lead groove of the lead screw 40. A lower head (not shown) is supported on the head carriage 43 by a head arm 46 via a leaf spring 45 on the head carriage 43. The pressing spring 47 presses the head arm 46 in order to press the upper head (not shown) against the lower head (not shown). The guide bar 48 is fixed to the base 11 with screws 49 and supports the head carriage 43.

Further, as a track 00 detecting mechanism for detecting the reference track position, a blade 50 is integrally provided on the head carriage 43, and a track 00 sensor 51 composed of a photo coupler is arranged corresponding to the blade 50. ing. The track 00 sensor 51 is mounted on one side of the PCB 52 along with other circuit components. The PCB
One of the two 52 is fixed to the base 10 with a screw 53, and the other 52 is held by being sandwiched by two arms 55a and 55b protruding from a side plate 54 fixed to the base 10. A square hole 56 is formed on the PCB 52, and a hole 57 is formed on the base 10 below the center of the square hole 56. The square holes 56 and 57 are PCB5
The position of the PCB 52 is adjusted by the adjusting jig such as an eccentric pin. Thereby, the position of the track 00 sensor 51 can be adjusted.

In FIGS. 4 and 7, a spindle shaft 58 is coupled to the spindle 25, and the spindle shaft 58 is a bearing (not shown) fixed to the base 11.
It is rotatably supported by. A drive pin 59 is supported on the spindle 25 so as to be vertically movable. The spindle 25 is integrally molded with a plastic magnet, the front surface and the back surface thereof are magnetized, and the index detecting Hall element 338 is formed.
It is embedded in the index signal magnet 60 at a position opposed to. As a result, the 3.5-inch FD
The spindle shaft 58 is fitted into the hole 203a of the
The drive pin 59 is fitted in 03b and is chucked by the magnetic force of the surface of the plastic magnet. Also, the magnetic force on the back surface of the plastic acts on the base 11,
By the suction force, the spindle shaft 58 and the base 1
It absorbs thrust play with a bearing (not shown) fixed to No. 1.

In FIG. 4, reference numerals 61, 62 and 63 are projections obtained by cutting and raising a part of the base 11, and the peripheral portion of the circular opening 201a at the center of the 3.5 inch FD 200 is shown. When it is deformed, it is for positioning so as not to contact the belt 24 and the like.

In FIGS. 4 and 7, the pulley 23 is D
It is fixed to the rotor 64 of the D motor. The DD motor is disposed between the base 10 and the base 11, and has a bearing (not shown) held by a housing 65 fixed to the base 10 and a spindle rotatably supported by the bearing. 66, a rotor 64 coupled to the inner ring of the bearing and rotatably supported, a stator (not shown) held in the housing, a motor PCB 67, and fixed to the rotor so as to face the stator. Drive magnet (not shown) and an inertia ring 68 fixed to the outer periphery of the rotor 64. The spindle 66 is driven to rotate, and the rotational driving force is applied to the rotor 64, the pulley 23, It is transmitted to the spindle 25 via the belt 24. The pulley 23 and the spindle 25 have the same diameter.

The inertial ring 68 has a function of reducing the rotational fluctuation of the DD motor. For example, when the 5.25 inch FD 210 is clamped during recording / reproducing of the 3.5 inch FD 200, Even if the rotation of the DD motor fluctuates due to the load of the clamping operation, the inertial mass of the inertia ring 68 is large, so that the rotational fluctuation of the spindle 25 is negligibly small, which has no effect on the operation of the 3.5-inch FD 200 before recording and reproducing. Is not given. The motor PCB 67 is connected to the PCB 52 by a cable.

Next, the 5.25 FDD section will be described. Figure 5
FIG. 6 is a view of the back side of FIG. 2, and FIG. 6 is a back view. In FIGS. 5 and 7, the base 10 is made of a metal plate formed by press working, and various mechanisms are mounted on it.

A mounting plate 70 for mounting a later-described clamp mechanism is fixed to the base 10 by screws 71. The 5.25 inch FD 210 is provided between the mounting plate 70 and the base 10 in the vicinity of the side plate 54.
A guide (not shown) is provided for taking a space for guiding insertion and ejection of the.

A sensor PCB 72 to which each sensor is attached is provided on the side of the base 10 with a screw 73 by means of a screw 73.
The sensor PCB 72 is provided with a write protect detecting phototransistor 74 for detecting the presence or absence of write protect, and a write protect detecting LED (not shown) is provided at a position opposite to the write protect detecting phototransistor 74. The above-mentioned 5.
A media-in detection phototransistor 75 for detecting the insertion of the 25-inch FD 210 is connected and arranged, and a media-in detection LED (not shown) is connected and arranged on the PCB 52 at a position opposed thereto. Further, the display LED 9 is connected, and the lead wire 78 from the phototransistor 77 fixed to the index detection sensor holder 76 attached to the attachment plate 70 is also connected to collectively connect the detection sensors. . The LED disposed opposite to the phototransistor 77 is the motor PC.
It is connected and arranged on B67. This sensor PCB72
Is connected to the PCB 52 by a cable.

In FIG. 5, the eject plate 79 is supported by a guide groove 81 of the eject plate 79 and a plurality of guide pins 80 arranged on the mounting plate 70 so as to be movable in the AB direction in FIG. The eject button 7 is attached to one end of the one end, and an engaging edge 82 that engages with a latch lever described later is formed at the other end. Further, an eject spring 83 is stretched between one side end of the eject plate 79 and the mounting plate, and always urges the eject plate 79 in the B direction. Further, at the other side end of the eject plate 79, a rising portion 84 that engages with a pad arm described later and a rack portion 86 that engages with a cylindrical gear type damper 85 attached to the attachment plate 70 are formed.

In FIG. 5, reference numeral 87 is a shaft implanted in the mounting plate 70, and a latch lever 88 is rotatably supported on the shaft 87. The latch lever 88 and the mounting plate are attached to each other. A spring 89 is stretched between 70 and
The latch lever 88 is always urged clockwise. In addition, the latch lever 88 has a rising portion 90 that comes into contact with the end portion of the 5.25-inch FD 210 that is inserted, and the engagement edge that holds the eject plate 79 at the rear position in the state where no medium is inserted. Slide edge 91 that engages with 82, and engagement edge 9 that engages with the engagement edge 82 of the eject plate 79 in the medium insertion state.
2 is formed.

In FIG. 5, the eject plate 7 is shown.
A pair of parallel rising portions 93 and 94 are formed on the plate 9. Two rollers 95 and 96 are rotatably supported between the rising portions 93 and 94. The roller 95,
The shaft portions 95a, 95b, 96a, 96b of 96 are fitted in the grooves 93a, 94a formed in the rising portions 93, 94, and the roller 96 abuts on the mounting plate 70.
Is in contact with.

In FIG. 5, a pair of parallel rising portions 97 and 98 are formed on the mounting plate 70. A shaft 99 is attached to the rising portions 97 and 98 and is formed on the center cone arm 100. The attached mounting portion 101 is the shaft 9
9, the center cone arm 100 is pivotally supported so as to be rotatable. A cam portion 102 and a slide portion that engage with the roller 95 are formed at one end of the center cone arm 100.
A center cone 104 is supported at the other end of the 0. A spring 105 is attached to the shaft 99,
The spring 105 is stretched between the mounting plate and the center cone 100 to urge the center cone arm 100 counterclockwise in FIG. The solid line in FIG. 9 shows the relational position in the clamped state, and the imaginary line shows the relational position in the unclamped state. A stabilizer B250 for pressing the 5.25 inch FD 210 at the time of clamping is attached to the center cone arm 100.

In FIG. 5, a center cone 104 is supported at the end of the center cone arm 100, and the center cone 104 is fixed to a center cone guide plate 106 attached to the attachment plate 70. It can be moved up and down based on. A holder 108 that fits with the guide shaft 107 is housed inside the center cone 104, and the center cone 10 is fitted around the holder 108 via a bearing 109.
4 is rotatably supported. Further, the center cone pressure plate 1 is provided on the boss portion 110 provided in a part of the holder 108.
11 is placed, and is sandwiched on the center cone pressure plate 111 by a retaining ring 112 fixed to the holder 108 with a slight gap. The center cone pressure plate 1
Reference numeral 11 is sandwiched and supported by arm portions 113 and 114 formed on the center cone arm 100.

In FIG. 7, the center cone 104 is shown.
A spindle 66 is arranged so as to face the.

In FIG. 5, a pair of parallel inner rising portions 118 are formed on the mounting plate 70, and a pair of parallel rising portions 120 are also formed outside thereof. The inner rising portion 118 and the outer rising portion 12
A falling portion 123 formed on the pad arm 122 is sandwiched between 0 and 0, and a protrusion (not shown) formed on the falling portion and the inner rising portion 118.
The pad arm 122 is rotatable by engaging with a hole (not shown) formed in the pad arm 122. The opposite side has the same structure. The pad arm 122 has a cut and bent portion 1
24 is formed, and the cut and bent portion 124 has a spring 1
25 is supported, and this spring 125 is stretched between the mounting plate 70 and the pad arm 122, and always urges the pad arm 122 in the clockwise direction. This pad arm 122
An arm portion 126 is formed at one end portion, and a stabilizer A128 that presses the 5.25 inch FD at the time of clamping is attached to the other end portion 127.
In addition, the protrusion 10 is provided at a position facing the stabilizer A.
d is formed on the base 10 to ensure that the stabilizer A128 presses against the 5.25 inch FD 210. An arm portion integrally formed with a head carriage, which will be described later, abuts on the end portion 127 to define the position of the head when not clamped.

In FIG. 5, the eject plate 7 is
A cam portion 129 that engages with the arm portion 126 of the pad arm 122 and raises and lowers the pad arm 122, and holding portions 130 and 131 are formed on the rising portion 84 of 9.

In FIG. 5, a head moving means is provided in the base 10. The head moving means includes a pair of upper and lower magnetic heads, a head carriage 137 that supports the magnetic heads, a guide bar 142 that guides the head carriage 137, and a lead screw 134 that moves the head carriage 137 to a predetermined position. And a stepping motor 132 that rotationally drives the lead screw 134. More specifically, the stepping motor 132 is fixed to a substantially U-shaped ST motor bracket 133.
A lead screw 134 is connected to the output shaft of the. The other end of the lead screw 134 is rotatably supported by a pivot bearing attached to the ST motor bracket 133. The ST motor bracket 133 is supported on the base 10 by a plurality of pins 135 so that the ST motor bracket 133 can be adjusted in the front-rear direction and is fixed by screws 136 after the adjustment. The lead screw 134
A lead pin 138 provided integrally with the head carriage 137 is engaged with the lead groove of the. A lower head (not shown) is fixed to the head carriage 137, and an upper head (not shown) is opposed to the lower head.
Is supported on the head carriage 137 by a head arm 140 via a leaf spring 139. Reference numeral 141 denotes a head arm 1 for pressing the upper head (not shown) against the lower head (not shown).
It is a pressing spring that presses 40. Further, a guide bar 142 for guiding the head carriage 137 is provided, and the head carriage 137 is axially supported movably in the front and rear of the guide bar 142. Further, as a track 00 detection mechanism for detecting the reference track position,
A vane 143 is integrally provided on the head carriage 137, and a track 00 sensor 144 including a photocoupler is arranged corresponding to the vane 143. The track 00 sensor 144 includes a track 00 holder 145.
Installed on. The track 00 holder 145 has a guide pin 146 fixed to the track 00 holder 145.
Can be adjusted with respect to the base 10 and is fixed with a screw 147 after the adjustment. In addition, the head carriage 1
An arm portion 148 which is in contact with the pad arm 122 and regulates the position of the upper head is integrally formed at 37.

2 and 5, the PCB 52 has a read / write circuit of a 3.5-inch FDD section and a read / write circuit of a 5.25-inch FDD, each control circuit, and a track 00 sensor 51 on one side. It is integrated and mounted on the surface. The control circuit integrates 3.5 inch FDD and 5.25 inch FDD control circuits into one IC. Reference numeral 149 in FIG. 2 denotes a power supply connector, and reference numeral 150 denotes an interface connector for exchanging signals with the host system. Similar to the above, the power supply connector and interface connector of the 3.5-inch FDD section and the power supply connector and interface connector of the 5.25-inch FDD section are collectively provided on one PCB.

Next, the operation will be described. Since the 3.5-inch FDD section is the same as the existing 3.5-inch FDD, the description is omitted.

When the 5.25-inch FD 210 is inserted through the insertion opening 6 of the panel 3, the front end of the FD 210 comes into contact with the rising portion 90 of the latch lever 88. When the push lever is further pushed, the latch lever 88 rotates counterclockwise against the spring 89 due to the insertion force. When the 5.25-inch FD 210 comes close to the mounting position, the engagement between the slide edge 91 of the latch lever 88 and the engaging edge 82 of the eject plate 79 is released, and the eject plate 79 is pulled by the pulling force of the eject spring 83. 5 Moves in the direction of the middle arrow B to the position regulated by the guide pin and the guide groove 81. Along with the movement of the eject plate 79, the rollers 95 and 96 rotatably held by the eject plate 79 also roll and move from the position shown by the chain double-dashed line in FIG. 9 to the position shown by the solid line. During this movement, the damper 85 prevents the sudden movement. At the same time, the roller 95 is the center cone arm 1
00 to contact the cam portion 102 and push up the center cone arm 100 by the cam action.
It is in contact with 03. After the movement of the eject plate 79, the engaging edge 92 of the latch lever 88 engages with the engaging edge 82 of the eject plate 79 and is locked at a predetermined position.

When the cam portion 102 side of the center cone arm 100 is pushed up, the opposite side is pushed down around the shaft 99 against the spring 105. The pushing down pushes down the arm portion 113 formed on the center cone arm 100, and in conjunction therewith, the holder 108 is lowered along the guide shaft 107 of the center cone guide plate 106 to which the holder 108 is fixed via the center cone pressure plate 111. . As the holder 108 descends, the tapered portion 115 of the center cone 104 is fitted into the inner opening of the spindle 66 arranged to face the center cone 104 through the hole 212a of the magnetic disk 212 of the 5.25 inch FD 210. Centering, and the pressing portion 116 of the center cone 104 presses the vicinity of the circumference of the hole 212a of the magnetic disk 212 against the magnetic disk mounting portion 66a of the spindle 66 to position and fix it.

When the 5.25 inch FD 210 is ejected, when the operator presses the eject button 7, the eject plate 79 moves in the direction of arrow A in FIG. 5 against the eject spring 83. Further, when the push is continued, the engaging edge 82 of the eject plate 79, which has been engaged with the engaging edge 92 of the latch lever 88, engages with the slide edge 91 of the latch lever 88, and the movement is restricted.

On the other hand, with the movement of the eject plate 79, the engagement between the roller 95 rotatably supported on the eject plate 79 and the slide portion 103 of the center cone arm 100 is released, and in FIG. By the center cone arm spring 105, the left end portion having the slide portion 103 is lowered around the shaft 99, and conversely, the end portion supporting the center cone 104 is lifted. As a result, the arm 114 of the center cone arm 100 lifts the center cone pressure plate 111, and the center cone pressure plate 111 moves the holder 108.
Lift the retaining ring 112 fixed to. As a result, the holder 108 is lifted while being guided by the guide shaft 107, and as a result, the center cone 104 is lifted and the magnetic disk 2 of the 5.25 inch FD 210 is moved.
The clamp on 12 is released.

With the movement of the eject plate 79, the arm portion 126 of the pad arm 122 regulated by engaging with the holding portion 130 formed on the rising portion 84 of the eject plate 79 resists the spring 125. Then, it is pushed down by the cam portion 129 and its position is regulated by the holding portion 131. As a result, the stabilizer A128 of the pad arm 122 is lifted, and the pressure on the 5.25 inch FD 210 is released. At the same time, the arm portion 148 of the head carriage 137 that is in contact with the pad arm 122 is also lifted, and the upper and lower heads are released from the magnetic disk 212.

The first embodiment will be described. As shown in FIGS. 8 (a) and 8 (b), the lock lever 30 is attached to the base 10.
2 is rotatably mounted, and the lock lever 302 is constantly urged outward from the magnetic disk insertion opening by a lock lever spring 303. For example, when the 3.5-inch side is writing or erasing, the solenoid 301 is driven by the signal from the write gate or the erase gate, that is, as shown in FIG. It is possible to prevent the actuator from rotating in the direction of the arrow d and pushing the lock lever to project into the magnetic disk insertion path to insert the recording medium of the magnetic disk.

The second embodiment will be described. As shown in FIGS. 9A and 9B, the lock lever 3 is attached to the mounting plate 70.
05 is rotatably mounted, and the lock lever is constantly urged to a position that does not hinder the movement of the center cone arm 100. For example, when the 3.5 inch side is writing or erasing, the solenoid 301 is driven by a signal from the write gate or erase gate,
That is, as shown in FIG.
Actuator pushes in the direction of arrow g, thereby causing the lock lever 305 to move to the center cone arm 100.
Center cone arm 10
0 falls and prevents clamping the recording medium.

[0046]

As described in detail above, the recording / reproducing apparatus of the present invention can be used in the dual FDD as described above.
For example, while writing or erasing on the 3.5-inch side,
The 5.25-inch FD cannot be inserted or cannot be clamped even if it is inserted, and vibrations during clamping can be prevented, and accurate 3.5-inch data writing or erasing becomes possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of the entire FDD of the present invention.

FIG. 2 is a plan view showing a state in which an outer cover is removed from FIG.

FIG. 3 is a front view of an FDD.

4 is an enlarged plan view showing a state in which a cassette guide is removed from the disc device shown in FIG.

5 is a plan view of the state of looking at the back surface of FIG. 2. FIG.

FIG. 6 is a rear view of FIG. 5 viewed from the rear side.

FIG. 7 is a side view showing a drive mechanism.

FIG. 8A and FIG. 8B are side views showing a lock mechanism.

9 (a) and 9 (b) are side views showing a lock mechanism.

[Explanation of symbols]

 1 FDD Main Body 2 Exterior Cover 3 Front Cover 4 Insertion Port 5 Eject Button 6 Insertion Port 7 Eject Button 10 5.25-inch FDD Base 11 11 3.5-inch FDD Base 14 Cassette Guide 21 Slide Plate 23 Pulley 31 Latch Lever 43 Head Carriage 40 Lead Screw 51 Track 00 Sensor 52 PCB 25 Spindle 64 DD Motor Rotor 66 Spindle 67 PCB 70 Mounting Plate 79 Eject Plate 100 Center Cone Arm 301 Solenoid 302 Lock Lever 305 Lock Lever

Claims (3)

[Claims] 1. A drive mechanism for driving different kinds of magnetic disks, a loading mechanism for loading each magnetic disk at a recording / reproducing position, and information recording / reproducing for each magnetic disk. In a magnetic disk device in which each magnetic head mechanism is arranged in parallel in a single device, when one magnetic disk is recording or erasing, the other magnetic disk has a means for making it impossible to insert or clamp. A magnetic disk device characterized by the above. 2. The magnetic disk device according to claim 1, wherein the means comprises a lock lever movably arranged in a magnetic disk insertion path and a solenoid for operating the lock lever. Magnetic disk device. 3. The magnetic disk device according to claim 1, wherein the means comprises a lock lever arranged to lock the center cone arm and a solenoid for operating the lock lever. apparatus.