JPH1074351A - Recording disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily load a recording cassette into the device and also to surely set a recording disk in a driving position by disposing a holder elevating/ lowering member, a cassette holder and a disk pressing member in this order on a device substrate. SOLUTION: The holder elevating/lowering member 4 is formed by forming one pair of cams in a bent state on right and left on both side parts of a plate- like material fitted freely slidably on the substrate 2 of the device B, and a cassette holder (not shown in the figure) is engageably supported via cam pins of cam engagement parts and is placed on the cams of the holder elevating/ lowering member 4. The disk pressing member (not shown in the figure) is interlocked with this cassette holder in order that a head pressing pad of the disk pressing member is brought into contact with the recording disk in driving attitude of the cassette holder and they are separated from each other in their attaching/detaching attitude, and under this condition, the device substrate 2, tone holder elevating/lowering member 4, the cassette holder and the disk pressing member are disposed in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording cassette in which a recording medium such as a floppy disk or the like is rotatably housed in a casing, which is detachably mounted in the apparatus, and various data are magnetically recorded or reproduced on the recording medium. And a disk drive device.

[0002]

2. Description of the Related Art In general, a drive apparatus of this type couples a floppy disk to a spindle connected to a drive motor, and scans a recording track on a rotating floppy disk with a magnetic head (transducer) to magnetically record. Or they are playing.

Conventionally, such an apparatus is disclosed, for example, in JP-A-56-11.
As shown in Japanese Patent No. 1173, a cassette holder for inserting and removing a recording cassette is guided to the apparatus frame in a vertically movable manner, and this holder is supported by a slidable vertically inclined cam surface. It is known that a recording cassette is mounted in or removed from a cassette holder at an ascending position, and a recording cassette in the cassette holder is engaged with a driving spindle at a lowered position.

[0004] A holder elevating member having an inclined cam surface for restricting the elevating of the cassette holder (sliding plate disclosed in the publication).
A pair is provided on the right and left sides of the holder, each of which is independently slidably supported on the side wall of the apparatus frame, and the left and right independent holder elevating members are linked to the opening / closing door at the cassette holder entrance.

[0005] In other words, with the door opened, the holder is moved up and down by the left and right holder elevating members interlocked with the door,
The opening and closing operation of the door and the left and right holder elevating members supporting the holder are linked to each other so that the holder is moved to the lowered drive position with the door closed.

Further, a similar device has been proposed in Japanese Patent Application Laid-Open No. 56-13562.

In the apparatus of the above publication, the above-mentioned holder elevating member (guide plate of the above publication) is fixed to the apparatus frame, while the holder for accommodating the recording cassette is linked to the opening / closing door and the inclined guide groove of the holder elevating member. , And moves to a drive position lowered when the door is closed and to a drive position lowered when the door is closed.

[0008]

In the case where the holder moves up and down between the attachment / detachment position and the drive position in conjunction with the opening / closing door provided at the cassette holder entrance as in the above-mentioned conventional apparatus, Since the recording cassette is inserted after opening, the door is closed, and the door is set to the driving state, there is a disadvantage that the setting operation from the mounting of the recording cassette to the driving state is troublesome. At the same time, the cassette holder is shifted from the mounting position to the driving position in conjunction with the opening and closing operation of the door, so the operator must load the recording cassette correctly in the cassette holder and close the door with care. Must.

That is, if the recording cassette is in an insufficient posture, for example, if the door is closed in a state where the cassette is incompletely mounted, the recording medium and the driving spindle or the recording head abut at an unexpected position to cause a failure. Also, if the door is vigorously closed even when the cassette is in the correct posture, the recording medium may be abutted against the drive spindle and the recording head, possibly damaging the recording medium.

Further, when the holder is vertically moved up and down by sliding a pair of left and right holder elevating members (the above-mentioned slide plate), unless the cam surfaces of the left and right holder elevating members act on the holder at the same time, the left and right holders are moved. The balance is lost, and a smooth lifting operation cannot be obtained. Therefore, there is a drawback that the devices such as a support mechanism for each of the left and right holder elevating members and a coupling mechanism for an interlocking portion with the opening / closing door are complicated and large in size.

[0011]

SUMMARY OF THE INVENTION The main object of the present invention is to provide a recording disk drive capable of easily mounting a recording cassette to a device and capable of setting a recording medium at a driving position without fail. I have.

Further, according to the present invention, it is possible to smoothly perform a vertical movement between a driving posture and a mounting / removing posture of a cassette holder in which a recording cassette is mounted with a simple structure, and to insert a recording cassette into the cassette holder. It is an object of the present invention to provide a drive device capable of performing each operation of setting to a drive position with a simple structure and capable of reducing the size and thickness of the device.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a cassette holder supported up and down between a detachable posture and a driving posture is held in a detachable posture by a holder elevating member, and the holder elevating member is recorded on the cassette holder. The cassette holder is moved in conjunction with the insertion operation of the cassette, the cassette holder is shifted from the mounting / removing posture to the driving posture by the movement of the holder elevating member, and the recording head on the drive device side is mounted on the recording medium housed in the driving posture of the cassette holder. Thus, the recording cassette can be easily and quickly mounted on the apparatus, and the recording cassette can be reliably set in the driving state.

For this purpose, a pair of left and right cams for moving the cassette holder from the driving position to the mounting / removing position and holding the cassette position in the mounting / removing position are formed on a holder elevating member which is reciprocally movable between the driving position and the mounting / removing position. The cassette holder is held in the mounting / demounting position by locking and locking the holder lifting / lowering member at the mounting / removing position against the charge spring, and the locking is released in conjunction with the insertion of the recording cassette into the cassette holder. When the cassette holder is shifted from the mounting / removing position to the driving position, the power is stored in the charge spring when the holder raising / lowering member is moved from the driving position to the mounting / removing position by an eject operation. Since the holder elevating member moves from the attaching / detaching position to the driving position, smooth movement can be obtained with a simple structure.

Further, an apparatus base, a holder elevating member in which a pair of left and right cams are formed in a bent shape on both sides of a plate-like material slidably attached to the apparatus base, and a cam on the holder elevating member The supported cassette holder and a disk pressing member are linked to the cassette holder in such a manner that the disk pressing member comes into contact with the recording medium in the driving posture of the cassette holder and separates in the mounting / removing posture, and the device base, the holder elevating member, the cassette holder, and the disk pressing member are sequentially arranged. By arranging in this order, each operation of inserting the recording medium into the cassette holder, engaging with the driving member, the recording head, and pressing the head by the disk pressing member can be performed with a simple structure, and at the same time, the device can be downsized. Thinning is possible.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First, a recording medium to be driven by the drive device of the present invention will be described. A recording cassette A shown in FIGS. 10 to 12 includes a recording medium (a recording disk 11 shown in the drawing) such as a floppy disk based on a polyester film. A casing 12 made of plastic for accommodating the recording disk 11;
The head scanning hole 15 formed in the
And a shutter plate 122 for opening and closing the shutter 5. A hub 13 is provided at the center of the recording disk 11, and an index hole 121 is provided around the hub 13.
Is provided.

The hub 13 has a center hole 13a as shown in FIG.
, An annular groove 13b, and a collision wall 13c.

The casing 12 has the same center hole 14 as the hub 13, a head scanning hole 15, left and right positioning holes 16 formed at the front end in the insertion direction into the cassette holder 3, and an index hole 121. An index window 17, a side display hole 18, a write protect hole 19, and guide grooves 124 on both left and right sides are provided on the circumference.

The shutter plate 122 keeps the head scanning hole 15 closed when not in use. The shutter plate 122 is connected to the interlocking piece 123 provided in the guide groove 124, and is always closed in the closing direction (the state shown in FIG. 11) by the biasing spring 125. Being energized.

Therefore, when the opening / closing operation piece 123 is moved from the state shown in FIG. 11 to the state shown in FIG. 12 against the urging spring 125, the shutter plate 122 opens the head operation hole 15, and the recording disk 11 in the casing 12 is opened. Can be accessed from outside.

On the other hand, the recording disk drive device B comprises a device base 2 composed of a frame of the device as shown in FIGS. 1 to 4, a cassette holder 3 for accommodating and detaching the recording cassette A, and a cassette holder 3. A holder elevating member 4 to be described later, which is composed of an elevating slide cam;
, A recording head (the illustrated magnetic head 6), and a disk pressing member (the illustrated head pressing pad 66).

The device base 2 and the cassette holder 3
A cassette accommodating space for accommodating the recording cassette A is configured.

The apparatus base 2 has an opening / closing door 21 for opening and closing the entrance of the cassette accommodating space, a driving member (spindle 24 shown), and an index hole 12 for the recording disk 11.
A light receiving portion 27 of the index sensor for detecting the position 1, a cassette positioning member (positioning pin 28 in the figure), and a locking member (lock lever 45 in the figure) for locking the holder elevating member 4 are provided.

The opening / closing door 21 is rotatably supported by a shaft 22 and is urged in a closing direction by a coil spring 23.

The spindle 24 has a projection 24a provided at the center as shown in FIG. 1, a flange 24b provided on the periphery of the projection 24a, and a transmission pin 24c embedded in the flange 24b. As described above, and one end is connected to a pulley 26
Is connected to the drive motor M of FIG.

The projection 24a fits into a center hole 13a formed in the hub 13 of the recording cassette A, and the flange 24b supports the hub 13. The transmission pin 24c engages with the annular groove 13b of the hub 13, abuts against the impact wall 13c in the annular groove 13b, and rotates the hub 13.

The light receiving section 27 of the index sensor is constructed by embedding a light receiving element such as a photodiode in a holder 27a made of synthetic resin.

The positioning pins 28 project from the apparatus base 2 at positions where they are fitted into the positioning holes 16 of the recording cassette A.

The positioning pin 28 and the spindle 24
Of the index sensor and the holder 27 of the index sensor
“a” is adjusted to a height at which the recording cassettes A are respectively supported.

The lock lever 45 is disposed on the device base 2 and has a tip claw 45a at one end thereof to lock the engagement protrusion 46 of the holder elevating member 4 in the state shown in FIG.
The other end 45b of the lock lever 45 is engaged with the leading end of the recording cassette A inserted into the cassette holder 3, the lock lever 45 is rotated clockwise in FIG. Is to be released.

The lock lever 45 is provided with a return spring 47.
Is urged in the counterclockwise direction in FIG.

As shown in FIG. 2, the cassette holder 3 has a top plate (top plate 31 shown in the figure) and a cassette accommodating portion composed of cassette guides 32 attached to the left and right sides of the top plate 31.

The top plate 31 is made of metal or other magnetic material, and shields the recording cassette A housed in the state shown in FIG. 4 from external magnetism.

As shown in FIG. 2, when the recording cassette A is inserted at the cassette entrance end,
Guide piece 31a for guiding the recording cassette A to the cassette guide 32, a light emitting portion 33 of the index sensor, a light emitting portion 34 of the side detection sensor for detecting the front and back of the recording cassette A, and a light emitting portion 35 of the write protect sensor. .

The cassette guide 32 is a recording cassette A
Have a U-shaped cross section facing left and right so that both sides of the top plate 31 are fitted together, and are attached to the left and right sides of the top plate 31 with screws 36.

The left and right cassette guides 32 have a cam engaging portion formed by a pair of left and right pins 37 and a pressing spring 3.
9, a stopper for restricting the leading end of the recording cassette A (abutting stopper piece 311 shown in the figure), and a shutter opening / closing member (an opening / closing claw 312 shown in the figure) that engages with the interlocking piece 123 of the shutter plate 122 of the recording cassette A. ing.

In the cassette holder 3 having such a configuration, the pins 37 are fitted into the long grooves 221 formed substantially perpendicularly to the left and right frames 29a and 29b of the apparatus base 2 so as to be substantially perpendicular to the apparatus base 2. It is supported to be able to move up and down in the direction. still,
The cassette holder 3 is urged by a spring 38 in one of the upper and lower directions, and in the illustrated case, in the lower driving posture side. The cassette holder 3 is supported by a holder elevating member 4 so as to be able to move up and down in a vertical direction orthogonal to the direction in which the recording cassette A is inserted.

The holder elevating member 4 has a guide groove 41 in the direction of insertion of the recording cassette A, engages with a pin 42 protruding from the apparatus base 2, and moves between a driving position (the state shown in FIG. 7) and a mounting position (FIG. 5). ) Is supported so as to be reciprocable.

As shown in FIG. 3, the holder raising / lowering member 4 is integrally provided with an eject operation member (eject button 43 shown) which can be operated from outside, and the operation direction of the eject button 43 (the direction of pushing the arrow in FIG. 3). ) Is urged by the charge spring 44 in the opposite direction (drive position side).

The holder lifting member 4 has a lock lever 4
An engagement protrusion 46 with which the front end claw 45a of the cassette 5 engages and a cam surface 48 with which the pin 37 of the cassette holder 3 engages are provided.

The cam surface 48 has a drive position cam surface 48a for supporting the front, rear, left and right pins 37 of the cassette holder 3 in the drive posture shown in FIG. A cam surface 48b and an inclined cam surface 48c for connecting the two cam surfaces are provided. The cassette holder 3 is not tilted horizontally, that is, in the front-rear direction by the movement of the holder elevating member 4, as shown in FIGS. , So as to raise and lower.

That is, by reciprocating the holder lifting member 4 between the driving position (FIG. 7) and the attaching / detaching position (FIG. 5), the cassette holder 3 is vertically moved horizontally in the driving posture and the attaching / detaching posture. It has become. The holder lifting member 4 is moved from the driving position to the attaching / detaching position by the eject button 4.
3 and moves from the attachment / detachment position to the drive position by the accumulation of the charge spring 44.

As shown in FIG. 8, the hub retainer 5 is
And a pressing piece 52 made of a slippery resin, which is in sliding contact with the hub 13 attached to the tip of the leaf spring 51 via a shaft 53.

The support shaft 53 of the pressing piece 52 supports the pressing piece 52 via an adjuster spring 54 so as to be swingable in a swinging state.

The hub holder 5 is pushed up by the top plate 31 of the cassette holder 3 when the cassette holder 3 is in the mounting / removing position at the raised position as shown in FIG. 9, and the cassette holder 3 is driven at the lowered position as shown in FIG. When in the posture, the elasticity of the leaf spring 51 causes the pressing piece 52 to press the hub 13 and securely engage the spindle 24.

The magnetic head 6 is mounted on a carriage 61 slidably supported in the direction of the center of rotation of the recording disk 11. The carriage 61 is driven and controlled by a pulley 63 of a pulse motor 62 and a steel belt 64 wound around the pulley 63.

That is, one end of the steel belt 64 is screwed to the carriage 61, the central portion thereof is wound and fixed on the pulley 63, and the other end is fixed to the carriage 61 via the adjuster spring 65.

Therefore, when the pulley 63 rotates clockwise in FIG. 4, the carriage 61 moves toward the center of the recording disk 11, and when the pulley 63 rotates counterclockwise, it moves outward. Detect and pulse motor 6
If the rotation of the magnetic disk 2 is controlled, the magnetic head 6 tracks the track on the recording disk 11.

A head holding pad 66 is supported by a head holding lever 67 so as to face the magnetic head 6. The head holding lever 67 is rotatably supported on the carriage 61 in the direction indicated by the arrow in FIG. 4 and is urged by a spring in a direction in which the head 61 is pressed against the magnetic head 6 although not shown.

The head holding lever 67 has a protrusion 6
8 is provided, and when the cassette holder 3 is in the mounting / removing posture at the raised position, the top plate 31 of the cassette holder 3 shown in FIG.
At the position 1b, the projection 68 is pushed up and separated from the magnetic head 6, and when the cassette holder 3 is in the lowered drive posture, it is released from the position 31b shown in the top plate 31 and the magnetic head 6
4 and presses the recording disk 11 against the magnetic head 6 as shown in FIG.

The operation of the illustrated embodiment will be described below with reference to the operation state diagrams of FIGS.

When the eject button 43 is pushed in as shown in FIG. 5, the holder elevating member 4 integral with the eject button 43 pushes the pin 37 to the detachable position where the cam surface 48b raises the cassette holder 3 and the long groove 221. It is pushed up along and supported. In this state, the charge spring 44 accumulates energy and the locking projection 46 is moved to the tip claw 4 of the lock lever 45.
The holder elevating member 4 is locked at 5a, and is held at this attachment / detachment position.

When the recording cassette A is inserted into the cassette holder 3 in this attachment / detachment posture, the recording cassette A is guided by the opening / closing door 21 and the entrance guide piece 31a, and
Invade inside 2.

At this time, the opening / closing claw 31 of the cassette guide 32
2 engages with the interlocking piece 123 of the shutter plate 122, and moves the shutter plate 122 as shown in FIG.
Then, the head scanning hole 15 is opened by rotating from the state of FIG. 12 to the state of FIG. 12, and the recording disk 11 can be externally scanned.
(Shutter opening operation) At the same time, the index window 17 is also opened, and the index hole 121 indicating the initial position of the recording disk 11 can be detected from the outside.

When the eject button 43 is depressed as shown in FIG. 5, the hub presser 5 and the head presser lever 67 come into contact with the top plate 31 of the cassette holder 3 and are pushed up. And the head holding pad 66 is separated from the magnetic head 6. Therefore, when the recording cassette A is inserted, it does not collide with the pressing piece 52 of the hub holder 5 and the head holding pad 66.

Next, when the recording cassette A is inserted to a predetermined position as shown in FIG.
5 and the lock lever 45
Is rotated clockwise in FIG.

Then, the tip claw 45a of the lock lever 45 is disengaged from the engaging projection 46 of the holder elevating member 4, and the holder elevating member 4 moves in the direction of the arrow in FIG. By the movement of the holder lifting member 4,
The pin 37 of the cassette holder 3 is lowered by the spring 38 in the long groove 221 along the cam surface 48c, and as shown in FIG.
Are supported by the cam surface 48a. (Cassette holder lowering operation) At this time, the cassette holder 3 is lowered vertically from directly above the spindle 24 and the positioning pins 28 on the device base 2,
The center hole 13a of the hub 13 is the protrusion 24a of the spindle 24.
In addition, the positioning hole 16 of the recording cassette A is
8 is securely fitted and positioned in a normal posture. (Cassette Positioning Operation) As the cassette holder 3 descends, the pressing piece 52 of the hub press 5 presses the hub 13, and the head press pad 66 of the head press lever 67 presses the magnetic head 6 via the recording disk 11. (Head pressing operation of recording medium) Recording and reproduction by the magnetic head 6 are performed.

When ejecting the recording cassette A from the drive device B, the eject button 43 is pushed from the state shown in FIG. 7 to the state shown in FIG. 5, and the pins 37 of the cassette holder 3 are moved along the cam surface 48c of the holder elevating member 4. The cassette holder 3 is raised vertically and the charge spring 4
4 and the engagement protrusion 46 of the holder elevating member 4
Is locked and locked by the tip claw 45a of the lock lever 45.

As the cassette holder 3 is raised, the recording cassette A is separated from the spindle 24 and the positioning pins 28.

At this time, the top plate 31 of the cassette holder 3 engages with the hub retainer 5, and the pressing piece 52 of the hub retainer 5 retreats from the fitting portion of the recording cassette A as shown in FIG.

In the initial stage of the rising of the cassette holder 3, the recording cassette A is resiliently pressed by the pressing spring 39 and maintains its position. However, when the cassette holder 3 is completely raised, the resilient pressure is weakened, and the recording cassette A is released. The spring spring 125 jumps out of the opening / closing door 21 by the accumulated power of the urging spring 125. At that time, the shutter plate 122 closes the head scanning hole 15 in the state of FIG.

According to the illustrated embodiment, when the recording cassette A is inserted to a predetermined position of the cassette guide 32, the tip claw 45a of the lock lever 45 is disengaged from the engaging projection 46 of the holder elevating member 4, and the holder elevates. The member 4 is moved by the charge spring 44 from the state shown in FIG.
b, the four pins 37 of the cassette holder 3
Moves down along the cam surface 48c in the long groove 221 by the accumulated force of the spring 38, so that the recording disk 11 can be mounted only by performing the mounting operation of the recording cassette A without opening / closing the opening / closing door 21.
Can be set to the driving state, and the mounting operation of the recording cassette A is easy.

Further, since the four pins 37 descend in the vertically provided long groove 221, the cassette holder 3 holds the spindle 24 and the positioning pins 28 while maintaining the horizontal posture.
To the center hole 13a of the hub 13
The positioning hole 16 of the recording cassette A can be securely fitted to the projection 24a of the spindle 24 with the positioning pin 28 in a normal posture and positioned.

On the other hand, when the eject button 43 is pushed in, the cassette holder 3 rises vertically along the cam surface 48c of the holder elevating member 4, so that the recording cassette A can be securely detached from the spindle 24 and the positioning pins 28. it can.

As described above, when the recording cassette A is horizontal, the center hole 13a and the positioning hole 16 of the pub 13 can be engaged with the projection 24a and the positioning pin 28 of the spindle 24. Less damage.

[0067]

【The invention's effect】

(1) The mounting operation of the recording cassette can be easily and reliably performed.

According to the present invention, when the cassette holder is moved from the attachment / detachment posture to the driving posture, the holder elevating member locked and locked at the attachment / detachment position in the charged state is released by the recording cassette inserted into the cassette holder. Since the holder elevating member moves by the accumulation force of the charge spring and shifts the cassette holder to the driving posture, the recording cassette can be set at the driving position by mounting the recording cassette on the cassette holder, and the mounting of the recording cassette can be performed easily and reliably. it can. (2) The elevating operation of the cassette holder is smooth and reliable.

Since the cassette holder is supported by a pair of left and right cams for raising and lowering the cassette holder, the raising and lowering operation is smooth in a well-balanced left and right direction, and the left and right cams form both sides of the plate-like material in a bent shape. Therefore, the right and left cams are integrally formed, and the structure is simple and smooth movement can be obtained without any play due to rattling or the like. (3) The device can be made thinner and smaller.

In the apparatus of the present invention, a device base, a holder elevating member of a plate-like material arranged on the base, a cassette holder on the holder elevating member, and a disk pressing member on the cassette holder are sequentially arranged in this order. Since they are arranged, the device can be made thinner and smaller.

In particular, since the holder elevating member is made of a plate-like material, it can be placed on the apparatus base so as to be superposed, so that the apparatus can be made thinner. The recording medium can be brought into contact with and separated from the recording medium without the need for a driving means, and the apparatus can be miniaturized with a simple structure.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a drive device according to an embodiment of the present invention, excluding a cassette holder.

FIG. 2 is a perspective view of a cassette holder constituting the drive device.

FIG. 3 is a plan view of a main part of the drive device.

FIG. 4 is a cross-sectional view of the drive device in a driving state.

FIG. 5 is a diagram illustrating a state in which a recording cassette is mounted on a cassette holder in a detachable posture.

FIG. 6 is a diagram illustrating a state in which a recording cassette is mounted at a predetermined position on a cassette holder in a detachable posture.

FIG. 7 is an explanatory diagram of a state of the cassette holder in a driving posture.

FIG. 8 is an explanatory diagram of an operation of a main part of the drive device.

FIG. 9 is an explanatory diagram of an operation of a main part of the drive device.

FIG. 10 is a perspective external view of a recording cassette.

FIG. 11 is an explanatory view of the internal structure of the cassette and the opening / closing operation of the shirt board.

FIG. 12 is an explanatory diagram of the internal structure of the cassette and the opening / closing operation of the shirt star plate.

[Explanation of symbols]

A: Recording cassette B: Recording disk drive M: Driving motor 2: Device base 3: Cassette holder 4: Slide cam (holder elevating member) 6: Magnetic head ( Recording head) 11 Recording disc (recording medium) 12 Casing of recording cassette 15 Head scanning hole of recording cassette 16 Positioning hole of recording cassette 122 Shutter plate 24 of recording cassette …… Spindle (drive member) 28… Positioning pin (cassette positioning member) 31… Top plate (top plate portion) 32 …… Cassette guide (cassette accommodating portion) 37… Pin (cam engagement) Part) 43 Eject button (eject operation member) 44 Charge spring 45 Lock lever (locking member) 4 8 Cam surface 66 Head holding pad (disk pressing member) 311 Abutting stopper piece (tip regulating stopper) 312 Opening / closing claw (shutter opening / closing member)

Claims (1)

[Claims] Claims 1. In a recording disk drive device in which a recording cassette in which a recording medium is rotatably incorporated is housed in a casing, and the recording medium is rotationally driven to record / reproduce with a recording head, (a) a driving member for rotating the recording medium; A device base equipped with a recording head,
(B) a disc pressing member swingably mounted on the device base capable of coming into contact with and separating from the recording medium at a position facing the recording head; and (c) a cassette accommodating portion capable of detachably accommodating the recording cassette. The recording medium has a pair of left and right cam engaging portions provided on both sides of the housing portion, and is supported so as to be vertically movable between a driving posture in which the recording medium is engaged with the recording head and a detaching posture retracted from the recording head. And (d) reciprocatingly mounted between the drive position and the attachment / detachment position on the apparatus base, and engages with the cam engaging portion to move the cassette holder from the drive posture to the detachment posture. A holder elevating member having a pair of left and right cams for holding the holder elevating member, a charge spring for constantly urging the holder elevating member toward a driving position, and a charge spring. An ejecting operation member for moving the holder elevating member from the driving position to the attaching / detaching position from the driving position to store the charge spring and shifting the cassette holder from the driving posture to the attaching / detaching posture, and (g) the holder elevating member. A locking lock member that locks and locks against the accumulated force of the charge spring at the attachment / detachment position, and releases the locking lock in conjunction with the insertion of the recording cassette into the cassette holder; The pair of left and right cams are formed in a bent shape on both sides of a movably mounted plate-like material to constitute the holder elevating member, and the cam engaging portion of the cassette holder is provided on the cam of the holder elevating member. The disc pressing member comes into contact with the recording medium in the driving posture of the cassette holder and separates in the mounting / dismounting posture. The apparatus foundation allowed conjunction with, the holder elevating member, the cassette holder, the recording disk drive device, characterized in that a disc pressing member sequentially in this order. 2. The cassette accommodating portion of the cassette holder is configured by providing a cassette guide having a U-shaped cross section on the lower surface side of both sides of the plate-shaped material, and the cassette holder is mounted on the device such that the cassette accommodating portion faces the device base. 2. The recording disk drive device according to claim 1, wherein said disk pressing member is supported by a holder elevating member on a base, and said disk pressing member is abutted against said top plate of said cassette holder. 3. 3. The recording disk drive according to claim 2, wherein the top plate of the cassette holder is made of metal or other magnetic material.