JPH067420B2 - Disk cassette loading mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic head fixed to the lower side of a disk (hereinafter referred to as a fixed-side magnetic head. It is a name for the head.
The same applies to “up” and “down”. ) And a magnetic head or pad held by a carriage that is vertically movable on the upper side (hereinafter referred to as a moving side magnetic head)
And a disk cassette (hereinafter referred to as a cassette)
Interlocked with the movement of the disc cassette holder (hereinafter referred to as the holder) for loading the cassette from the raised position (hereinafter referred to as the standby position), which is the cassette insertion and ejection position, to the lowered position (hereinafter referred to as the set position), which is the recording or reproduction position. A magnetic disk device cassette loading mechanism adapted to perform recording or reproduction by contacting a moving magnetic head with a magnetic disk surface located on the fixed magnetic head side. An impacting means is provided for absorbing an impact when the moving side magnetic head comes into contact with the magnetic disk surface located on the fixed side magnetic head side in association with the lowering to the set position, and the impact reducing means is a holder. So that it can be moved from the standby position on the opposite side of the cassette insertion port to the set position of the cassette insertion port. When loading the cassette to the set position, the dar is provided with an abutting portion on the cassette insertion port side in the vicinity of the cassette so as to project from the cassette surface in the direction opposite to the cassette insertion port side. Yes,
When loading the cassette into the holder, the abutting part gradually protrudes from the cassette surface on the cassette insertion opening side in conjunction with the downward movement of the holder, and this protruding motion causes the fingertip that is inserting the cassette to move in the direction opposite to the insertion direction. The movement of the holder, which is integral with the abutting part, is braked by using the pressing force in the direction, and as a result, the downward movement of the moving side magnetic head is braked to position it on the fixed side magnetic head side. The present invention relates to a cassette loading mechanism, which is configured to reduce an impact when the magnetic disk surface is abutted.

[Prior Art] In a conventional magnetic disk device, as a means for abutting the moving side magnetic head on the magnetic disk surface at a position facing the fixed side magnetic head, a holder for holding a cassette containing a magnetic disk is used. There is one in which the movement of the moving side magnetic head is interlocked. That is, when the cassette inserted into the holder from the cassette insertion port is further pushed together with the holder to a predetermined position, the holder is urged downward by the spring and falls toward the set position, and at the same time, is supported by the holder. The carriage of the moving magnetic head is also dropped from the standby position, and the moving magnetic head comes into contact with the magnetic disk surface positioned on the fixed magnetic head side. However, in the moving mechanism of the moving magnetic head as described above, the holder suddenly drops toward the set position due to the pulling force of the spring, so that the moving magnetic head also faces the magnetic disk surface located on the fixed magnetic head side. It had a drawback that it was hit violently and scratched the magnetic disk surface or the magnetic head. Further, when the moving-side magnetic head suddenly falls, it collides violently with the fixed-side magnetic head, and this impact causes the magnetic head to be defective.

On the other hand, as an example of a shock mitigating means for mitigating a shock when the moving side magnetic head descends toward the fixed side magnetic head and comes into contact with the magnetic disk surface, for example, Japanese Patent Laid-Open No. 59-65977. It is a device. This device is provided with a reciprocating plate that interlocks with the downward movement of the holder as the above-mentioned buffering means, and a piston is connected to this reciprocating plate and a cylinder is fixed to the machine frame to form a damper. It has a mechanism that applies braking to the downward movement. Further, the above-mentioned shock absorbing device is not limited to the air type damper, but is provided with a braking device such as an oil damper or a friction damper which can perform braking in conjunction with a reciprocating plate.

FIG. 7 to FIG. 10 show a conventional shock absorber configured to realize this, FIG. 7 is a partially cutaway plan view showing the same cassette after insertion, and FIG. 8 shows the same cassette inserted. FIG. 7 is a cross-sectional view taken along the line III-III of FIG.
FIG. 9 is a sectional view taken along the line IV-IV of FIG. 7 showing the main part of the damper before the cassette is inserted, and FIG. 10 is a sectional view taken along the line IV-IV of the same line showing the main part of the damper after the cassette is inserted. is there.

In these figures, 35 is a holder for holding a cassette 36, and the holder 35 is reciprocating (8th holder).
It is held on the side plate 37 of the machine frame so that it can be moved in the direction C in the figure or in the opposite direction. Further, the holder 35 is provided with a sliding contact rotation roller 39 and an engagement roller 40, which are mounted on the support shaft 38 at four lower positions, respectively. As shown in the left side of FIG. 8, each of the engagement rollers 40 is slidably contacted with the peripheral surface of the L-shaped guide groove 41 formed in the side plate 37, and each engagement roller 40 is inserted into the discharge button 42 as shown in the right side of FIG. The push-up portions 44, which are bent and projected on the reciprocating plate 43, are in sliding contact with each other. The spring 4 is placed between the holder 35 and the side plate 37.
5 is stretched, and when the holder 35 is in the standby position, the sliding contact roller 39 and the side surface of the guide groove 41 prevent the holder 35 from sliding in the direction opposite to the C direction. When the holder 35 begins to slide in the C direction, the spring 45 causes the holder 35 to move downward and
It is biased in the opposite direction.

On the other hand, on the reciprocating plate 43, as shown in FIG. 7 and FIG.
A piston 46 is connected, and the piston 46 is fitted in a cylinder 47 fixed to the machine frame, and the piston 46 and the cylinder 47 form a damper 48.

In this type of shock absorber, when the cassette 36 is inserted from the insertion port of the front wall 49 in the direction shown in FIG. 8C, the end surface 36a of the cassette 36 becomes the inner end surface 35a of the holder 35.
Abutting against, and pushing the cassette 36 further, the holder 3
Along with 5, slides in the C direction against the spring 45.
As the holder 35 slides in the C direction, the sliding contact rotation roller 39, which is in sliding contact with the high-level horizontal portion of the step portion of the guide groove 41 of the side plate 37 at the standby position, is disengaged from the high-level horizontal portion. Therefore, the holder 35 is pulled downward by the component force of the tension of the spring 45 in the vertically downward direction, and descends. Simultaneously with the lowering of the holder 35, the moving side magnetic head 50 is also lowered to the set position by an interlocking mechanism (not shown). Further, following the lowering of the holder 35, the engaging roller 40, which is in sliding contact with the horizontal portion at a high place of the step portion of the push-up portion 44 bent and projected on the reciprocating plate 43 at the standby position, pushes up the push-up portion 44. Then, the reciprocating plate 43 slides in the direction opposite to the C direction by the horizontal component force of the pressing force applied to the slope by the engagement roller 40. And
As the reciprocating plate 43 slides in the direction opposite to the C direction, the piston 47 connected to the reciprocating plate 43 positioned as shown in FIG. 9 in the standby position gradually resists the air pressure in the cylinder 48 and gradually. As shown in FIG. 10, slide in the direction opposite to the C direction. Therefore, by the braking of the damper, the sliding motion of the reciprocating plate 43 in the direction opposite to the C direction is damped, and the descent of the engagement roller 40 and the descent of the holder 35 are damped following the sliding motion of the reciprocating plate 43. Head 50
Since it gently descends to the surface of the magnetic disk located on the fixed magnetic head side, the impact at this time does not damage the fixed magnetic head.

[Problems to be Solved by the Invention] However, when the holder is lowered as described above, the configuration of separately disposing the braking device that interlocks with the reciprocating plate that follows the holder is complicated, and it is necessary to control them. It requires additional mechanisms and electric parts, is expensive, requires a large number of assembling steps, and has drawbacks in that it is difficult to stabilize the characteristics, especially when oil is used for control. The present invention has been made in view of this point, and provides a cassette loading mechanism having a buffering function of a moving side magnetic head capable of applying a braking force to a descending motion of a holder with a simple structure. is there.

[Means for Solving Problems] In order to achieve the above-mentioned object, in the conventional technology,
When inserting the cassette, the inner end surface of the holder is directly pressed by the end surface of the cassette, and the holder is moved to the
Although it was slid in the direction of FIG. C, in the present invention, the locking member that locks the holder at the standby position is provided in the machine frame, and when the cassette is inserted, the end face of the cassette and the locking member. A means for unlocking the holder by engaging with and is taken, and at the same time, the holder opened by the elastic means can slide in the direction opposite to the direction of FIG. 8C, that is, to the cassette insertion port side. Further, the holder is provided with an abutting portion, and the abutting portion is configured to gradually protrude in the vicinity of the cassette and from the cassette surface as the holder slides toward the cassette insertion port side.

[Operation] In the cassette loading mechanism configured as described above,
Inserting the cassette into the holder, pressing the holder by the cassette, sliding in the direction of holder C,
Sliding contact rotation roller release, spring holder lowering,
The engaging roller descends, the slope of the reciprocating plate is pressed by the engaging roller,
According to the present invention, the cassette holder is not dependent on the buffering means due to the complicated relative movement between the multiple members, such as sliding of the reciprocating plate in the opposite direction of C direction and sliding of the piston in the opposite direction of C direction. Insertion of the holder, pressing of the holder locking member by the cassette, unlocking of the holder, lowering of the holder by a spring, sliding in the opposite direction of C direction, and projection of the abutting part are the means to reverse the sliding direction of the holder. Then, the sliding of the holder in the opposite direction is used as it is for the projecting movement of the abutting portion, and the projecting movement of the abutting portion presses the fingertip which is inserting the cassette, and the force of inserting the cassette by the fingertip is applied. Buffering can be performed by utilizing the relative relationship with the pressing force applied to the fingertip by the contact portion.

[Embodiment of the Invention] The present invention will be described in detail below with reference to an embodiment shown in FIGS. 1 to 6. 1 is a partially cutaway plan view of a cassette loading mechanism according to an embodiment of the present invention when a holder is at a standby position, and FIG. 2 is a partially cutaway plan view when the holder is at a set position. Figures and 3 are the same as above
FIG. 4 is a side view of the drawing, FIG. 4 is a side view of FIG. 2 of the same as above, and FIG. 5 is an enlarged sectional view taken along the line I-I of FIG.
FIG. 6 is an enlarged sectional view taken along the line II-II in FIG. 2 showing the same when the discharge button is pressed.

In these figures, 1 is a frame having side plates 1a and 1a bent upward on both side surfaces, and 2 is a cassette insertion slot 2
It is a front bezel which forms the front surface which has a. Reference numeral 3 denotes a guide member that is fixed at four positions on the left, right, front and rear of the frame 1, and that engages with legs provided on a lower plate of the holder, which will be described in detail later, and guides the slide of the holder.
Each guide member 3 is composed of left and right guide walls 3a and 3b formed in parallel with the cassette insertion or ejection direction. Further, as shown in FIG. 3, the bottom of the space formed by the parallel side walls of the guide walls 3a and 3b is formed with a step portion that descends toward the cassette insertion opening 2a, and a holder position for restricting the vertical movement of the holder is formed. It is the regulation member 4. That is, the holder position regulating member 4 is formed with a holder standby position surface 4a having a high horizontal portion and a holder set position surface 4c having a low horizontal portion, and these horizontal portions are connected by an inclined surface 4b, It is formed by a flat surface that slides when the legs arranged on the lower plate of the holder, which will be described later, stop and slide vertically.

On the other hand, 5 is a holder for holding the cassette 6 when the cassette 6 shown in FIG. 3 is loaded, and the holder 5 is similar to the cassette 6 and has an upper plate 5a having a slightly larger area.
Further, the lower plate 5b and the upper plate 5a, which are only a part of the cassette insertion port 2a side, and the side plate portions 5c, 5c for engaging the lower plate 5b are configured. Also, two protrusions 7, 7 are provided laterally at four positions on the left, right, front and rear of both sides of the upper plate 5a, and the same protrusions are also provided at two positions on both sides of the lower plate 5b. Pieces 8 and 8 are provided so as to project laterally, and the projecting pieces 7 and 7 and 8 and 8 are inserted into the rectangular cutout holes 9 and 9 and 10 and 10 of the side plate portions 5c and 5c, respectively. Thus, the holder 5 is integrally connected. Then, on the upper plate 5a, as shown in the center of FIG. 1, a moving side (upper side) magnetic head carriage 11 is vertically movable.
A cutout portion 12 is formed, and an arcuate cutout groove 1 is formed above the cutout portion 12 (FIG. 1) for retracting while rotating a cassette contact roller pin of a cassette discharge lever described later in detail.
3 is formed. Further, on the side of the upper side plate 5c of the side plate 5c in FIG. 1 opposite to the cassette insertion opening 2a (on the left side of the drawing), the side plate 5c is brought into contact with a locking portion of a cassette ejection lever described later, A lock portion 14 bent in a U-shape is formed. Further, the protrusion formed at the tip of the central portion of the lower plate 5b on the cassette insertion port 2a side is
When the cassette 6 is inserted, the abutting portion 15 is horizontally fixed so that the abutting portion 15 can be moved to just below the lower surface of the cassette 6 so as to directly abut the fingertip into which the cassette 6 is inserted and press the fingertip. Then, on the lower surface of the lower plate 5b, I-shaped leg portions 16 are provided so as to be able to slide in a slide-shaped space formed by the guide member 3 and the holder position restricting member 4 and at positions corresponding to the spaces. It is hung down,
The leg portions 16 are fitted between the guide walls 3a and 3b of the guide member 3 on both right and left sides (when viewed from the front bezel side), and the bottom surface thereof is the holder standby position surface 4a or the inclined surface of the holder position regulating member 4. 4b or the holder set position surface 4c. Further, the lower plate 5b is provided on the front bezel 2 side in two positions on the right upper side in FIG.
As shown in the figure, the bent portions 17 and 1 are bent downward so as to engage with the pressing portion of the discharge button which will be described in detail later.
Formed 7. Then, as described above, the holder 5 including the upper plate 5a, the lower plate 5b, and the side plate portions 5c and 5c.
Is wound around the pins 18, 18 planted on the side plates 1a, 1a of the frame 1 on both the left and right sides (viewed from the front bezel side) of the lower side of the substantially central portion thereof, and the side plates 1a, 1a and side plate portions 5c, 5 of the holder 5
The twisting coil springs 20 and 20 stretched between the pins 19 and 19 planted in c give the habit of clockwise rotation about the pin 18 in FIG. When the torsion coil springs 20 and 20 are rotated in the clockwise direction in the figure, the holder 5 slides toward the cassette insertion opening 2a in the standby position. It is blocked because the lock portion 14 of 5c is locked. Further, since the lower plate 5b of the holder 5 has a structure for holding only the front side portion of the cassette 6 on the cassette insertion port 2a side from below when the cassette 6 is loaded, the rear side portion of the loaded cassette 6 A cassette guide groove (not shown) is formed in the side plate portions 5c, 5c so as to hold the cassette.

On the other hand, as shown in the upper left of FIG. 1, a cassette discharge lever 22 is rotatably fitted to the pin 21 implanted in the frame 1, and the holder 5 is attached to the tip of the cassette discharge lever 22. A cassette contact roller pin 23 that engages with the arcuate notch groove 13 formed in the upper plate 5a is planted, and the cassette contact roller pin 23 engages with the cassette end that engages with the front edge 6a of the cassette 6. A roller 24 is pivotally supported. The cassette ejection lever 22 is bent in an L shape up to a substantially central portion to form a horizontal fan shape centered on the pin 21, and an arc portion of the fan shape is bent vertically to stand up. An arc-shaped locking portion 25 for locking the lock portion 14 formed on the side plate portion 5c of the holder 5 is formed. The horizontal fan-shaped portion is set so that it can rotate below the lock portion 14 and the side plate portion 5c. Further, the cassette ejection lever 2
2 is a torsion coil spring 27 wound around a pin 21 and stretched between a spring hooking piece 26 formed on an extension member of the guide member 3 and a central portion of the cassette lever 22.
Thus, the habit of counterclockwise rotation about the pin 21 in FIG. 2 is given. Further, as shown in the upper right part of FIG. 1 and as shown in FIG. 5, the discharge button 2 fitted to the front bezel 2 so as to be slidable inside the front bezel 2.
8 is provided, and the pressing portion 2 is provided at two positions above the tip end surface of the discharge button 28 on the holder 5 side, at positions facing the bent portions 17, 17 formed on the lower plate 5b of the holder 5.
9, 29 are provided. Then, the pressing portions 29, 2
9, an L-shaped spring mounting surface 30 formed on the front bezel side of the guide member 3 and a holder 5 of the discharge button 28 along the direction in which the discharge button 28 is pressed.
A compression coil spring 31 is urged between the side tip surface and the discharge button 28 so as to project outward, and the compression coil spring 31 is planted along the inner diameter of the spring mounting surface 30. The spring lock pin 32 is fitted and held. The ejection button 28 is detached outward from the front bezel 2 by the reaction force of the compression coil spring 31 and the protruding position outward from the front bezel 2 is formed on the front bezel 2 as shown in FIG. It is regulated by the engagement between the regulation protrusion 2b and the stepped portion 28a formed at the tip of the ejection button 28. Further, 33 and 33 in FIGS. 1 to 4 are positioning pins for determining the position when the cassette 6 is loaded, and 34 and 34 regulate the height position of the cassette 6 on the front bezel 2 side. There is a regulating member for.

Next, the operation of the embodiment of the present invention configured as above will be described.

As will be described in detail later, a case of first ejecting the previously loaded cassette and setting the holder 5 at the standby position will be briefly described with reference to FIG. 2 and FIG. Holder 5 by pressing in the direction
Slides in the B direction, and the locking portion 14 of the side plate portion 5c of the holder slides in the B direction in conjunction with this, so that the side surface of the locking portion 14 and the locking portion 25 of the cassette ejection lever 22 are locked. To be solved. Therefore, the locking portion 25 is rotated counterclockwise around the pin 21 by the reaction force of the torsion coil spring 27, and the arc-shaped portion of the locking portion 25 is aligned with the tip of the locking portion 14. It abuts and locks the holder 5 in that position. At the same time, the bottom surface of the leg portion 16 on the lower surface of the holder 5 slides on the holder standby position surface 4a following the sliding of the holder 5 in the B direction, so that the holder 5 is locked in the raised position. Further, the cassette loaded is ejected by the rotation of the cassette contact roller 23 following the pin 21 of the cassette ejection lever 22 in the counterclockwise direction and the raising of the holder 5 described above. That is, the standby position of the holder 5 before inserting the cassette 6 is when the holder 5 is located at the raised position on the opposite side of the cassette insertion port 2a (see FIGS. 1 and 3).
This standby position is a position above the center line of the opening of the cassette insertion opening 2a as shown in FIG. next,
Insertion of the cassette 6 will be described. When the cassette 6 is inserted into the holder 5 at the standby position as shown in FIG. 1 and FIG. 3 from the cassette insertion opening 2a of the front bezel 2 in the direction of the arrow A, the front edge 6a of the cassette 6 (second
Figure shows the cassette contact roller 2 of the cassette ejection lever 22.
4, the cassette contact roller 24 is pressed in the direction A by the front end edge 6a of the cassette 6, so that the cassette discharge lever 22 resists the reaction force of the torsion coil spring 27. While being guided by the arcuate cutout groove 13 formed in the upper plate 5a of the holder 5, the cassette contact roller pin 23 is rotated clockwise around the pin 21 and positioned as shown in FIG. Then, at the end of the rotation of the discharge lever 22 described above, the discharge lever 2
The locking portion 25 of 2 is the lock portion 1 of the side plate portion 5c of the holder 5.
4 is released from the engagement with the tip of the holder 4,
Pins 18, 18 of the torsion coil springs 20, 20 shown in the figure
The left and right side surfaces (as viewed from the front bezel 2 side in FIG. 1) of the leg portion 16 disposed on the lower plate 5b by the horizontal component force of the clockwise turning habit around the guide member 3 While being guided by the guide walls 3a, 3b, the slides in the direction opposite to the A direction. Following the sliding of the holder 5 in the direction opposite to the A direction, the bottom surface of the leg 16 slides down from the holder standby position surface 4a to the inclined surface 4b and descends to the holder setting position surface 4c. Therefore, the holder 5 descends while sliding in the direction opposite to the A direction and is positioned as shown in FIGS. 2 and 4. The lower position on the cassette insertion port 2a side is the set position of the holder 5 and the cassette 6, and this position is the cassette insertion port 2a as shown in FIG.
Slightly below the centerline of the opening. When the holder 5 is slid in the direction opposite to the direction A by the above-mentioned torsion coil springs 20, 20, the stop position is such that the tip of the engaging portion 25 of the discharge lever 22 is the locking portion 14 of the side plate portion 5c of the holder 5. Since the rotation of the pin 23 in the counterclockwise direction around the pin 21 is prevented by the contact with the pin 23, the rotation of the pin 23 implanted in the discharge lever 22 is also prevented, and therefore the pin 23 of the holder 5 is prevented. It is set so as to come into contact with the end edge 13b (FIG. 1) of the arcuate notch groove 13 of the upper plate 5a to be regulated. Also, as the holder 5 descends, the cassette 6
Also, at this time, the positioning pins 33, 33 are fitted into the cassette positioning holes provided in the cassette 6 to set the cassette 6 in the proper position. The height is the regulation member 34,
34 regulated.

On the other hand, following the sliding of the holder 5 in the direction opposite to the A direction, the abutting portion 15 fixed to the lower plate 5b of the holder 5 is also being inserted in the A direction. It starts to slide upward in the direction opposite to the direction A, and when the leg portion 16 of the holder 5 almost reaches the middle of the inclined surface 4b, it begins to protrude from the cassette 6, and the contact portion 15 inserts the cassette 6 by this protrusion. It comes into contact with a certain fingertip and gradually begins to press the fingertip in the direction opposite to the A direction. Therefore, the fingertips that try to press the cassette 6 in the A direction are gradually pressed by the contact portion 15 in the opposite direction, and the sliding of the holder 5 in the opposite direction to the A direction is braked by this relative relationship. An interlocking mechanism (not shown) can apply braking to the descending movement of the moving-side magnetic head carriage 11 that descends in conjunction with the sliding of the holder 5 in the direction opposite to the A direction, and fixes the moving-side magnetic head. It is possible to gently descend and contact the magnetic disk surface located on the side magnetic head side.

Next, the ejection of the cassette 6 will be described. When the cassette 6 loaded in the holder 5 in the set position as shown in FIGS. 2 and 4 is ejected in the direction opposite to the direction of the arrow A, compression is performed as shown in FIGS. 2 and 5. The ejection button 28 is pressed in the direction of the arrow B while being opposed to the coil spring 31, and is positioned as shown in FIG. By this pressing operation, the bent portions 17 and 17 formed on the holder 5 are pressed in the B direction by the pressing portions 29 and 29 of the discharge button 28, so that the holder 5 has the squirrel coil shown in FIG. Spring 2
While resisting 0 and 20, the left and right side surfaces of the leg portion 16 disposed on the lower plate 5b (as viewed from the front bezel 2 side in FIG. 2) are guided by the guide walls 3a and 3b of the guide member 3. , Slide in the A direction. Following the sliding of the holder 5 in the A direction, the bottom surface of the leg portion 16 rises from the holder setting position surface 4c to the inclined surface 4b and then to the holder standby position surface 4a. Therefore, the holder 5 slides in the direction A and ascends and is positioned as shown in FIGS. Then, the raised position on the cassette insertion opening 2a side is the holder 5
And the ejection position (standby position) of the cassette 6, which is slightly above the center line of the opening of the cassette insertion opening 2a as shown in FIG. Following the sliding of the holder 5 in the A direction, the contact portion 15 also slides in the A direction and retracts inward of the front bezel 2.

On the other hand, by sliding the holder 5 in the A direction,
As shown in FIG. 2, the locking portion 25 of the cassette discharging lever 22 that was in contact with the side surface of the lock portion 14 of the side plate portion 5c is released from the locking, so that the cassette discharging lever 22 moves in the coil spring 27. Is rotated in the counterclockwise direction about the pin 21 by the reaction force of the lock lever 14, and the lock portion 14 is locked again by the arcuate surface of the locking portion 25 of the cassette discharge lever 22 to move the holder 5 to the discharge position (standby position). Lock. The cassette contact roller pin 23 is rotated counterclockwise about the pin 21 while being guided by the arcuate cutout groove 13 of the upper plate 5b following the rotation of the cassette discharge lever 22 described above. The front edge 6a of the cassette 6 that is in contact with the cassette contact roller 24 is pressed and discharged in the direction opposite to the direction A, that is, in the discharge direction of the cassette 6. Further, when the cassette 6 is ejected, the moving-side magnetic head carriage 11 is raised by the interlocking mechanism (not shown) in association with the sliding of the holder 5 in the direction A, and the restricting member 34 penetrating the lower plate 5b. , 34 and positioning pins 33, 3
3 is set by an interlocking mechanism (not shown) so as not to hinder the slide movement of the holder 5 in the A direction and the ejection of the cassette 6 as the holder 5 moves upward. The eject button 28 that has been pressed is automatically returned by the reaction force of the compression coil spring 31 when the pressing is released. Further, the slide of the holder 5 in the A direction by pressing the discharge button 28 causes the pin 23 and the arc-shaped cutout groove 13 to slide.
It is regulated by the terminal surface 13a of FIG.

[Effects of the Invention] As described in detail above, according to the cassette loading mechanism of the present invention, the holder is movably held from the standby position on the side opposite to the cassette insertion port to the insertion side set position, In addition, the holder is provided with an abutting part so that when the cassette is loaded in the set position, it is located near the bottom surface of the cassette on the insertion port side and projects from the cassette surface in the direction opposite to the insertion direction. At the time of moving and descending, the contact portion gradually protrudes from the lower surface of the cassette on the insertion port side and presses the fingertip inserting the cassette in the direction opposite to the insertion direction, and brakes the fingertip inserting the cassette. be able to. Therefore, the sliding of the holder 5 is also braked by the above-mentioned braking, and the holder gently descends while sliding in the direction opposite to the direction in which the cassette is inserted. Therefore, the movable magnetic head carriage interlocking with this also gently descends. However, it is possible to mitigate the impact at the time of contact with the magnetic disk surface located on the fixed magnetic head side due to the lowering of the moving magnetic head. As described above, in the present invention, the buffer mechanism is configured to apply the braking force by the protruding movement of the abutment portion integrally formed with the holder by utilizing the sliding movement of the holder in the direction opposite to the cassette insertion direction as it is. Therefore, a complicated control mechanism is not required, and a simple structure can be achieved. Also, an expensive damping mechanism such as a damper is not required, an extra electric component is not required, and it is inexpensive and ready for manufacture to perform a reliable operation. There is a great effect such as a buffer mechanism being obtained.

Although the present invention has been described with reference to the embodiments, the present invention is of course not limited to such embodiments, and various design modifications can be made without departing from the spirit of the present invention. Is.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a cassette loading mechanism according to the present invention when a holder is in a standby position with a part cut away, and FIG. 2 is a partial cutaway when the holder is in a set position. Plan view, FIG. 3 is a side view of FIG.
The figure is a side view of FIG. 2 of the same as above, FIG. 5 is an enlarged cross-sectional view of the I-I line of FIG. 1 showing the main part of the discharge button of the same as above, and FIG. II line enlarged sectional view, FIG. 7 is a partially cutaway plan view showing after insertion of a cassette showing an example of a conventional technique, and FIG. 8 is the same as FIG. 7 showing a main part when a cassette is being inserted. -III sectional view, Fig. 9 is the same as Fig. 7 showing the main part of the damper before inserting the cassette IV-IV
FIG. 10 is a sectional view taken along line IV-IV in FIG. 7 showing a main part of the damper after the cassette is inserted therein. 1 ... Frame, 2 ... Front bezel, 2a ... Cassette insertion slot, 3 ... Guide member, 4 ... Holder position regulating member, 4a ... Holder standby position surface, 4c ... Holder setting position surface, 5 ... ... Holder, 5a ... (holder) upper plate, 5b ... (holder) lower plate, 5c ... (holder) side plate part, 6 ... cassette, 11 ... moving side magnetic head carriage, 13 ... arcuate notch Groove, 14 ... Lock part, 15 ... Abutment part, 16 ... Leg part, 20, 20 ... Neril coil spring, 22 ... Cassette ejection lever, 23 ... Cassette contact roller pin, 24 ... Cassette Contact roller, 25 ... Locking part, 27 ... Torsion coil spring, 28 ... Ejection button, 29 ... Pressing part, 31 ... Compression coil spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Yamada 5329 Shimo-Suwa Town, Suwa-gun, Nagano Sankyo Seiki Co., Ltd. (72) Inventor Yujiro Matsuzawa 5329 Shimo-Suwa Town, Suwa-gun, Nagano Sankyo Seiki Co., Ltd. Within

Claims (1)

[Claims] 1. A fixed-side magnetic head on one side, and a movable-side magnetic head or pad held on a carriage movably supported on the other side so that the disc cassette holder is at a disc cassette insertion and ejection position. The moving side magnetic head or pad is brought into contact with the magnetic disk surface at a position facing the fixed side magnetic head in association with the movement from the ascending position to the recording or reproducing position, and the recording or reproducing is performed. In the disk cassette loading mechanism of the magnetic disk device, the disk cassette holder is movably held from an ascending position opposite to the disk cassette insertion port to a descending position at the disk cassette insertion port side. When loading the disc into the recording or playback position, So as to protrude into the insertion opening side than near a and the disc cassette of the cassette, a disk cassette loading mechanism of a magnetic disk apparatus characterized in that a contact portion on the disk cassette holder.