JPH0351774Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a magnetic head, and an object of the present invention is to provide a structure in which the azimuth angle of the magnetic head can be adjusted with high precision and the structure can be miniaturized.

In the conventional magnetic head mounting structure, the magnetic head is fixed to the upper part of a mounting plate with a step, a spring plate is stacked on this mounting plate, and the lower part of the mounting plate is used to attach the head holding member. It is fixed to the surface by a first screw or the like, and is similarly fixed to the mounting surface by a second screw or the like while the upper part remains raised from the mounting surface by the step difference. and the second
The azimuth angle of the magnetic head is thereby adjusted by rotating and adjusting the screw to elastically deform the mounting plate using the first screw portion as a fulcrum while regulating the spring force of the spring plate.

However, according to this method, since the mounting plate is only locally regulated by the first and second screws, the amount of deformation when adjusting the rotation of the second screw tends to be relatively large, and the minute amount of deformation of the head is likely to be large. There are disadvantages in that it is difficult to adjust the azimuth angle, and since the head is exposed, it is easily damaged by contact with other parts.Also, the mounting plate and spring plate protrude to the sides of the head, creating a space. This method has the disadvantage that it becomes large in size, and also requires at least a mounting plate, a spring plate, a pair of screws, etc., resulting in a large number of parts.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

Fig. 1 is an exploded perspective view of a disk holder of a floppy disk device to which an embodiment of the magnetic head mounting structure of the present invention is applied, Fig. 2 is an exploded perspective view of the main parts of the device, and Fig. 3 4 is an exploded perspective view of the reduction mechanism unit of the above device, and FIGS. 5 and 6 are views of the above device before operation with the disk holder removed. FIGS. 7 and 8 are longitudinal sectional front views of the device before and after operation, respectively.

In the figure, a floppy disk device 11 has a frame 12. As shown in FIGS. 1 and 2, the frame 12 has a pair of guide grooves 12a and 12b, a central hole 12c in the middle thereof, a pair of cut and raised plate parts 12d on the rear side,
Other cut and raised plate portions 12e, spring locking convex portions 12f
and two pairs of cut and raised protrusions 12g on the same line, respectively.
12h, one slot 12i, right side cut and raised plate parts 12j, 12k, cut down plate part 12l, spring locking convex part 12m, three positioning holes 12n, and left side cut and raised plate part 12p. , 12q, a projecting plate portion 12r, a motor housing hole 12s, and a half-opening convex portion 12x disposed inside the spring 82 to prevent one end of the torsion spring 82 from coming off, which will be described later. A bearing 13-1 is fitted and fixed in the center hole 12c, and a pair of support pins 14 are fixed in the center of the frame 12.

15 is a drive shaft, and as shown in FIGS. 3, 4, 7, and 9, a disk table 16 is fitted to the upper end, and a spiral cam is separately rotatably fitted below the disk table 16. Plate 17 and gear 18-6 (both 17, 1
8-6 rotates integrally), and furthermore, a gear 18-3 is fitted and fixed to be able to rotate integrally below the gear 18-3, and a screw 20 and a washer 121 are fixed to the downward protruding end of a metal plate support frame 25, which will be described later. The flywheel 1 has a flywheel 122 provided therein.
22 is a washer 12 installed in the screw hole at the lower end of the drive shaft 15.
1. The screw 120 passing through the hole 122a is screwed in and fixed to the drive shaft 15. The drive shaft 15 is the seventh
As shown in the figure, it is rotatably supported between a bearing 13-1 of the frame 12 and a bearing 13-2 of a gear shaft support plate 31, which will be described later.

As shown in FIGS. 5 and 9, the disk table 16 has a ring shape made of die-cast zinc with a predetermined thickness, and has a spring support plate 19 disposed on the lower surface of the ring with a pair of lower projections 16a (one in FIG. 9). (only shown) is fixed by caulking. In addition, a disk positioning engagement pin 20, which is housed in the recess 16b of the disk table 16 at a position eccentric from the axis of the disk table 16 so as to be movable up and down, is urged upward by the coil spring 21 so that its collar 20a comes into contact with the ceiling of the recess. The upper ends of the pins 20 protrude above the upper surface of the disk table 16. Note that the pin 20 is inserted into the hole 16c of the disk table 16 and the hole 19a of the spring support plate 19.
is guided in the vertical direction. As will be described later, the disk table 16 is fitted onto the upper end of a drive shaft 15 that is inserted through and projects above the frame 12, and is fixed to the drive shaft 15 by a hexagon socket head screw 22 so as to be freely rotatable therein.

As shown in FIGS. 4 and 17, the cam plate 17 has an outer circumferential spiral cam portion 17a (small diameter cam portion 17a-1, medium diameter cam portion 17a-2, large diameter cam portion 17a-3).
, a stepped cam portion 17b, and an inclined cam portion 17c,
The cam portion 17d is parallel to the directions of arrows A and B at the initial rotational position shown by solid lines in FIGS. 5 and 17.

23 is a speed reduction mechanism, as shown in FIGS. 3 and 4, which includes a support frame 25 made of a metal plate, a gear shaft support plate 31 made of resin, a U-shaped plate 32, and a pulley 1 made of brass.
8-1, a pulley gear 18-2 made of resin, and gears 18-3 to 18-6. The frame 25 includes one central hole 25a, four small-diameter pin holes 25b, a pair of screw holes 25c, and a mounting plate portion 25d (screw holes 25
d-1), and three brass support pins 33 (having a small diameter portion 33a and a screw hole 33b at the upper end) are fixedly erected. Gear shaft support plate 3
1 has a central hole 31a, four large diameter pin holes 31b,
It has three gear shaft parts 34-36. This gear shaft support plate 31 is placed on the upper surface of the frame 25, and
As shown in Figure 0, four stepped pins 37 are projected downward through the large diameter pin holes 31b and the small diameter pin holes 25b, respectively, and are fixed by caulking the protruding portions. Then, the bearing 13-2 is fitted and fixed into each of the central holes 31a and 25a of the gear shaft support plate 31 and the frame 25.

The U-shaped plate 32 is fixed to a pair of screw holes 25c of the frame 25 by a pair of screws 38, and a motor 40 is fixed to the upper surface of the U-shaped plate 32 by a pair of screws 39.

The pulley 18-1 is coaxially fixed to the output shaft of the motor 40 below the U-shaped plate 32, and the other pulley gears 18-2 and gears 18-4, 18-5 are connected to the gear shafts 34, 35, 36, respectively. is fitted and supported. Further, the lower end of the drive shaft 15 is inserted into and supported by the bearing 13-2. Note that a belt 41 is stretched between the pulley 18-1 and the pulley portion of the pulley gear 18-2. Therefore, the rotation of the motor 40 is first caused by the pulleys 18-1,
The drive shaft 15 is sequentially decelerated by the pulley gear 18-2 and the gear 18-3 (the gear 18-3 is the drive shaft 15).
(integrated with). Therefore, the drive shaft 15 is the fourth
It rotates at a desired speed in the direction of arrow C in the figure. On the other hand, the rotation of the gear 18-3 is caused by the rotation of the gears 18-4, 18-
The cam plate 17 is sequentially decelerated by 5 and 18-6.
(integrated with gear 18-6). Therefore,
The cam plate 17 moves toward the drive shaft 1 in the direction of arrow D in FIG.
It rotates at an extremely low speed compared to the rotation speed of No. 5.

As shown in FIG.
The support pins 33 are fitted into the respective positioning holes 12n from below for positioning, and the screws 42 from the upper surface side of the frame 12 are screwed into the screw holes 33b at the upper ends of the support pins 33 to be fixed. At this time, the upper end of the drive shaft 15 is
3-1, and the motor 40 is inserted into the hole 12s.
It projects upward from the frame 12.

According to the above-mentioned mounting structure of the deceleration mechanism 23, the support pins 3 of the plurality of separate members are erected on the support frame 25.
3 to the frame 12, the height dimension of each support pin 33 and the support frame are smaller than those in which a plurality of support plate portions integrally bent from the support frame 25 are attached to the frame 12. The accuracy of perpendicularity with respect to 25 can be improved. Therefore, the separation dimension and parallelism between the support frame 25 and the frame 12 can be set accurately, and the operation accuracy of the speed reduction mechanism 23 can be improved.

Reference numeral 43 designates a first circuit board, as shown in FIG.
4 (including a pair of reed switches 44a and 44b). This circuit board 43 is connected to the frame 12
The pair of projecting plate portions 43b are respectively engaged with the pair of engagement grooves 12t of the frame 12, and one screw 45 is inserted through the hole 43a into the deceleration mechanism 2.
It is mounted by screwing into the screw hole 25d-1 of the mounting plate portion 25d of No. 3. Therefore, only one screw 45 is required to attach the first circuit board 43, and the attachment work is easy.

51 is a carriage, and as shown in FIG. 2, it roughly includes a carriage body 52, a head holder 53, a magnetic head 54,
It consists of a pad holding arm 55. As shown in FIGS. 1, 2, 5, and 7, the metal plate carriage main body 52 has a pair of guide holes 52a on the right side, a guide hole 52b on the left side, )
A pair of guide rollers 57-1 and 57-2 supported respectively on a pair of downwardly protruding pins 56 on the same line.
, a spring locking pin 58, and a cut-and-raised plate portion 52c.
(having a screw hole 52c-1), a slot 52d, and a screw 5 after attaching the carriage 51 to the frame 12.
and a position detection magnetic unit 60 fixed by 9.

The head holder 53 is made of die-cast aluminum, for example, and includes a head holding part 53a and a bridge part 53b.
(having a hole 53b-1), a pair of support plate parts 53c
(each having a hole 53c-1), a lower surface protrusion 53d,
It has a slot 53e, a square hole 53f, and a hole 53g.

As shown in FIGS. 14 and 15, the head holding portion 53a includes a through storage hole 53a-1, a stepped portion 53a-2 on two sides in the middle, and vertical protrusions 53 on the other two sides.
a-3, one horizontal screw hole 53a-4.

61 is a spring plate for biasing the head;
As shown in Figure 5, the T-shaped spring plate extends from each side of the L-shaped spring plate (however, the legs of the T-shape are curved parts 61a that are curved inward).
) are respectively installed upright, and the storage holes 53
a-1 and placed on the stepped portion 53a-2.
Lead wires 62 are connected to a plurality of pins 54a at the lower end of the magnetic head 54, and the magnetic head 54 is fitted into the storage hole 53a-1 from below. 63 is a hexagon socket screw,
Screwed into the screw hole 53a-4, the storage hole 53a
-1 The inward protrusion comes into contact with the rear end of the left side of the magnetic head 54. Therefore, the magnetic head 54
In FIG. 5, two sides are supported by the protrusions 53a-3 in line contact with each other, and the other two sides are supported by local pressure contact with each curved portion 61a of the spring plate 61. Therefore, after the carriage 51 is assembled to the frame 12, if the screw 63 is rotated and adjusted to increase the force of contact with the head 54, the head 54 will be moved to the curved portion 61.
It swings slightly in the direction of the arrow E in FIG. 15 against the springiness of the curved portion 61a, and when the contact force is made small, it swings slightly in the direction of the arrow F due to the springiness of the curved portion 61a. Thereby, the azimuth angle of the magnetic head 54 can be easily adjusted.

According to this, since the magnetic head 54 itself is housed in the housing hole 53a-1 of the head holding portion 53a, its movable range is set small in advance. Therefore, when adjusting the rotation of the screw 63, the amount of displacement of the magnetic head 54 is relatively small, and the azimuth angle can be adjusted with high precision. Also, the magnetic head 54 is located in the storage hole 53.
Since it is housed in a-1, there is no risk of damage due to contact with other members. Also, the overall configuration (storage hole 53a
-1, the head 54, spring plate 61, screw 63) are compact, and the number of parts can be reduced by adding only the spring plate 61 and screw 63 as adjustment members.

The pad holding arm 55 is made of resin, and has a pad 64, an engaging protrusion 55a, and a pair of holes 55b, as shown in FIG. This pad holding arm 55
The pin 65 inserted into the square hole 55b and each hole 53c-1 of the support plate portion 53c is attached to the head holder 53.
It is pivotably supported by. This arm 55 is urged to swing downward by a torsion spring 71 wound around a pin 65, and the engagement convex portion 55a engages with an engagement guide portion 79a-5 of a disk holder 79, which will be described later, in a relatively movable manner. 64 faces the head 54 at a distance.

This head holder 53 (having a head 54 and a pad holding arm 55) is placed on the upper surface of the carriage main body 52, and is positioned so that it can be relatively displaced in the directions of arrows A and B by fitting the lower surface protrusion 53d into the slot 52d. In addition, a presser spring plate 72 (shown in FIGS. 2 and 15) is fixedly attached to the carriage main body 52 with screws 73 through the rectangular hole 53f. At this time, the spring locking convex portion 58 protrudes upward through the hole 53g, and the cut and raised plate portion 52c also protrudes upward through the slot 53e to face the bridge portion 53b. Here, as shown in FIG. 1, FIG. 2, and FIG. -1 screwed in. Therefore, when the long screw 74 shown in FIG.
2, it slightly slides in the direction of arrow A in the figure against the coil spring 75, and when the rotation is adjusted in the opposite direction, it slides slightly in the direction of arrow B in the figure. This makes it possible to finely adjust the track position of the magnetic head 54 with respect to the disk body 103 of the floppy disk 101, which will be described later, to ensure compatibility of the floppy disk 101 for each device.

76-1 and 76-2 are a pair of guide rods.
For example, the guide rod 76-1 is commonly brought into contact with the outside of the pair of cut and raised protrusions 12g on the right side of the frame 12,
A pair of spring plates 78 each fixed to the frame 12 by screws 77 are pressed against each of the cut and raised protrusions 12g for positioning. The other guide rod 76-2 is similarly positioned in pressure contact with the outside of the pair of cut and raised protrusions 12h on the left side.

Therefore, the carriage 51 has guide holes 52 on both sides.
a and 52b are a pair of guide rods 76-1 and 76, respectively.
-2 is fitted with no looseness only in the vertical direction and with play in the left and right directions. Furthermore, in the carriage 51, a pair of guide rollers 57-1 and 57-2 are fitted into a pair of front and rear guide grooves 12a and 12b in a guiding manner with slight play in the left and right direction, so that arrows A,
It is said to be able to slide freely in the B direction.

Here, as shown in FIGS. 1, 2, and 5, the carriage 51 is moved by the arrow B by the coil spring 66 stretched between the spring locking pin 58 and the spring locking protrusion 12f.
The front guide roller 57-1 stops at the initial position where it contacts the small diameter cam portion 17a-1 of the cam plate 17. Further, since the carriage 51 is simultaneously biased toward the right side by the coil spring 66, the guide rollers 57-1 and 57-2 are constantly pressed against the right side of the guide grooves 12a and 12b, respectively, thereby improving sliding accuracy.

79 is a resin disk holder, as shown in Figures 1 and 7.
As shown in FIG. 11, it generally includes a ceiling plate portion 79a, a pair of spring plates 80 on the lower surface thereof, and both side plate portions 79b. The ceiling plate portion 79a has a square hole 79a at the front end.
-1, central boss portion 79a-2 and its hole 79a-
3. It has a rear end substantially square hole 79a-4 and its inner engagement guide portion 79a-5. Also, both side plate portions 79b
each has a lower end disk holding portion 79b-1, a disk stopper portion 79b-2, a boss portion 79b-3, and a swing stopper plate portion 79b-4, and the right side plate portion 79b has an engaging convex portion at the front end. 79b-5 and leg 79
It has b-6. As shown in FIG.
The stopper plate portions 79b-4 are pivotally supported to the frame 12 by pins 81 inserted through the respective holes 12d-1 of the pair of cut-and-raised plate portions 12d of 2, and each stopper plate portion 79b-4 is inserted into the opening portion 12u of the frame 12, respectively. inserted.
However, both ends of the torsion spring 82 wound around one boss portion 79b-3 are attached to the disk holder 79, respectively.
is engaged with the ceiling plate portion 79a and the spring locking convex portion 12m of the frame 12. Therefore, the disk holder 7
9 is urged upward by the torsion spring 82, and each stopper plate portion 79b-4 abuts against the stopper portion 12u-1 of the opening 12u, and is stopped at the upper swing limit.

Reference numeral 83 denotes a swing lever, which has a push button 84 at the front end, a vertical elongated hole 83a, a lower bending cam portion 83b, and a rear end hole 8.
3c, has a leg portion 83d below the elongated hole 83a, and the hole 8
It is pivotally supported to the cut-and-raised plate portion 12k of the frame 12 by a pin 85 via the pin 3c. Also, the pin 91 has a long hole 8.
3a is loosely inserted and fixed to the frame 12j. Therefore, the swing lever 83 is vertically swingable within a range in which the lower end and the upper end of the elongated hole 83a selectively contact the pin 91, respectively.

Reference numeral 92 denotes an engagement lever, which has an engagement part 92a, a cam pin 92b, and a boss part 92c, and is connected between the right side plate of the frame 12 and the cut-down plate part 12l via the boss part 92c, as shown in FIGS. Erected pin 93
It is fitted so that it can swing freely. However, the boss part 92
Both ends of the torsion spring 94 wound around c are engaged with the engagement lever 92 and the peripheral edge of the opening 12V of the frame 12, respectively. Therefore, the engagement lever 92 is the eleventh
The cam pin 9 is biased to rotate counterclockwise in the figure.
2b presses against the cam portion 83b of the swing lever 83 and pushes the lever 83 upward. Therefore, the swing lever 83 is at the upper swing limit position where the lower end of the elongated hole 83a abuts the pin 91.

Reference numeral 95 denotes a pair of resin disk positioning blocks, and as shown in FIG.
5b (inclined guide portions 95a-1, 95b-1, respectively)
), each of which is fixed to the front end of the upper surface of the frame 12 by a screw 96.

97 is a second circuit board, which has one hole 97a and one projecting plate part 97b as shown in FIG.
2, one projecting plate part 97b is cut and raised to form a plate part 12q.
is engaged with the groove hole 12q-1, and is fixed to the projecting plate portion 12r via the hole 97a with the screw 98.

In FIG. 2, 99 is a switch for detecting that the floppy disk 101 is set at the recording/reproducing position, and 100 is a switch for detecting the prevention of erroneous erasure of the floppy disk 101.

Reference numeral 101 designates a floppy disk, as shown in FIG. 16, in which a disc-shaped disk main body 103 is rotatably housed in a rectangular resin cassette 102. The cassette 102 has a circular hole 102a and a rear groove hole 102b on the upper and lower sides, and also has convex portions 102c on both sides of the front end, holes 102d on both sides of the rear end, and claw portions 102e inside thereof.
has. The disk body 103 has a central boss portion 10
4, its center hole 104a, and one eccentric engagement hole 10
4b, and the boss portion 104 peeks out through the circular hole 102a of the cassette 102. Furthermore, cassette 1
Labels 105 on which product names and the like are printed are affixed to the upper and lower surfaces of the front end of 02, respectively.

Next, the operation of the device 11 will be explained. As shown in FIGS. 7 and 11, the floppy disk 101
is inserted into the disk holder 79 from the front, and the rear end of the cassette 102 comes into contact with the stopper portion 79b-2 and is held by the pair of disk holding portions 79b-1. Even if the floppy disk 101 is tried to be inserted into the disk holder 79 with the front and back reversed, the protrusions 102c on both sides of the front end of the cassette 102 abut against the side plates 79b, preventing insertion, thereby preventing erroneous insertion.

Next, when the disk holder 79 is manually pushed down against the torsion spring 82 from the state shown in FIG. It comes into contact with the upper part of the engaging part 92a, and as the lever 92 swings clockwise back and forth, it engages with the lower part of the engaging part 92a, as shown in FIG. Therefore, the leg portions 79b-6 of the disk holder 79 substantially contact the upper surface of the frame 12, and are locked in the downward swinging position shown in the figure.

As a result, as shown in FIG. 8, the floppy disk 101 also moves downward, so that the front end of the lower surface of the cassette 102 comes into contact with the pair of disk positioning blocks 95, and the rear end of the lower surface comes into contact with the pair of disk support pins 14. Accordingly, the floppy disk 101 is moved upward by a predetermined amount relative to the disk holder 79 and comes into contact with the pair of spring plates 80 to press and deform them, thereby being held without play in the vertical direction.

In this case, when the floppy disk 101 moves downward, the front end of the cassette 102 is positioned in the front-back direction by the positioning plate part 95a of each block 95 while being guided by the inclined guide part 95a-1, and the convex parts 102c on both sides of the front end of the cassette 102 are Each block 95 is positioned in the left-right direction by the positioning plate portion 95b while being guided by its inclined guide portion 95b-1. In this case, the front end of the lower surface of the cassette 102 comes into contact with the oscillator of the detection switch 99 to switch the push-down switch. This detects that the floppy disk 101 has been set to the recording/reproducing position. Further, the claw portion 102e at the left rear end pushes down the oscillator of another detection switch 100 to switch the switch, thereby detecting that the floppy disk 101 can be rewritten and recorded. If the claw portion 102e is broken off and removed, the detection switch 10
0 cannot be detected and rewrite recording is impossible. That is, erroneous erasure of the disk body 103 is prevented.

Furthermore, at the same time, as shown in FIG.
hole 79a-3 of the disk holder 79 through 4a.
Insert it loosely. Further, the disk table 16 also contacts the lower surface of the boss portion 104.

At this time, since the disk body 103 is at an arbitrary rotational position, its eccentric hole 104b does not correspond to the engagement pin 20 of the disk table 16 in the vertical direction. Therefore, the engagement pin 20 is once pushed down by the boss portion 104 against the spring 21 until the upper end of the pin substantially coincides with the upper surface of the disk table 16.

At the same time, in FIG. 8, the magnetic head 54 relatively contacts the lower surface of the disk body 103 through the lower slot 102b of the cassette 102.

At the same time, as shown in FIG.
5 swings downward, and the pad 64 moves to the cassette 102.
through the upper slot 102b of the disk body 103.
The disk body 103 is pressed against the upper surface and is lightly clamped between the head 54 and the disk body 103.

Next, the motor 40 is started for a short time and the deceleration mechanism 2
Based on the deceleration rate a of the pulley 18-1, gear pulley 18-2, and gear 18-3, the drive shaft 15 (disc table 16) starts rotating at a low speed, for example, in the direction of arrow C in FIG. Then, the engagement pin 20
The upper end of the pin is the boss part 104 of the disk body 103.
It rotates while slidingly contacting the lower surface, and at a position in the circumferential direction that coincides with the eccentric engagement hole 104b of the disk body 103, is moved upward by the bias of the coil spring 21, and the engagement hole 104
b, and thereafter the disk table 16 and the disk body 103 are in a state of integral rotation. In order to achieve the above engagement, the drive shaft 15 must be
It is enough to rotate it. During this time, the cam plate 17 rotates by a slight angle in the direction of arrow D in FIG. 17, but this can be ignored.

Next, the motor 40 is started again, and the drive shaft 15 and the disk body 103 in FIG. The deceleration rate b (b
Based on <<a), rotation is started at an extremely low speed in the direction of arrow D in FIG. Then, the guide roller 57-1 of the carriage 51 gradually moves from the small diameter cam part 17a-1 to the medium diameter cam part 17a-2 and the large diameter cam part 17a- along the spiral cam part 17a of the cam plate 17.
In order to make sliding contact in three directions, it gradually starts sliding in the direction of arrow B against the coil spring 66.

Therefore, from now on in FIG. 17, the head 54 moves at a very low speed in the direction of arrow A while moving in the direction of arrow C.
Since the head 54 comes into sliding contact with the disk body 103 rotating at a low speed in the direction, the head 54 eventually runs along the spiral recording/reproducing line 103a shown by the dashed line in the figure relative to the disk body 103 to record or reproduce. Let's do it. At the point when the head 54 actually starts recording or reproducing, the carriage 51 slightly slides in the direction of dimension arrow A from the position shown in FIG. 5 (during this time, the head 54 reaches the position 54' in FIG. 17).
This is when the magnet of the magnet unit 60 accurately opposes one reed switch 44a of the first circuit board and closes the reed switch 44a, thereby outputting a permission signal for recording or reproducing operation. Ru. In FIG. 17, the radial track pitch P of the spiral recording/reproducing line 103a is actually about 0.4 mm.

Also, during the recording or reproducing operation, the pair of guide rollers 57-1, 57-2 of the carriage 51
are the guide grooves 12a, 12 on both sides of the drive shaft 15.
Since the distance between the rollers is larger at position b, the sliding precision of the carriage 51 can be improved accordingly. Furthermore, regarding the front guide roller 57-1, the 17th
In the drawing, the contact point between the guide roller 57-1 and the cam plate 17 is located above the direction line of arrows A and B passing through the center of the roller 57-1. 1 is pressed downward in the figure. Therefore, the roller 57-1 is connected to the coil spring 6.
Together with the action of 6, the guide groove 12a is always pressed against the right side of the guide groove 12a. Regarding the rear guide roller 57-2, the head 54 (integrated with the carriage 51 and roller 57) in FIG. 17 receives sliding contact force in the downward direction in the figure from the rotating disk body 103, so it is not affected by the action of the coil spring. Together with this, the roller 57-2 is always pressed against the right side of the guide groove 12b. That is, since both guide rollers 57-1 and 57-2 are constantly pressed against the right side of the guide grooves 12a and 12b in the same direction while the carriage 51 is sliding, there is no fear that the carriage 51 will be twisted while sliding, and the sliding precision can be further improved. It can be improved.

In addition, in order to center the head 54 during assembly, the carriage 51 must be moved by the guide rollers 57-1 and 57.
-2 and the head 54 integrally, a concrete cam plate having the same shape as the cam plate 17 is attached to the frame 12 in advance, and the guide roller 57-1 is brought into contact with the cam plate to prevent the head 54 from moving. The position relative to the carriage 51 can be adjusted by rotating the screws 63 and 74 as described above. Therefore, the centering adjustment work is much easier than in the case where the guide roller 57-1 and the head 54 are constructed separately.

As described above, when recording or reproduction continues spirally from the outer circumference to the inner circumference of the disk body 103, and when the disk body 103 has rotated a predetermined number of times and the cam plate 17 has rotated approximately once, the magnet The magnet of the unit 60 is exactly opposite to the other reed switch 44b so that the reed switch 44
b is switched to close, whereby a recording or reproduction prohibition signal is output and recording or reproduction ends.

At this time, the guide roller 57-1 reaches the position 57-1' in FIG.
4'' position) and is in contact with the large diameter cam portion 17a-3 of the cam plate 17.
As the carriage 51 rotates, the carriage 51 is urged in the direction of arrow A by the coil spring 66, so that the guide roller 57-1 moves to the inclined cam part 17c via the stepped cam part 17b, and the inclined cam moves to the inclined cam part 17c. Due to the guide restriction by the portion 17b, the cam 10 relatively travels in the direction of the parallel cam portion 17c. Therefore, the carriage 51 starts sliding back in the direction of arrow B by the coil spring 66 at a higher speed than when sliding in the direction of arrow A.

The guide roller 57-1 is connected to the parallel cam portion 17.
At the point in time when the transition is to point d, the guidance restriction of the guide roller 57-1 disappears, so the carriage 51 suddenly speeds up at high speed by the bias of the coil spring 66 until the guide roller 57-1 returns to contact with the small diameter cam portion 17a-1. The slide returns to the position shown in Figure 5.

Since the stepped cam portion 17b and the inclined cam portion 17c are particularly provided on the cam plate 17, the carriage 51 is returned at a speed lower than the above-mentioned high speed during most of its return stroke, and the return operation shock is widened. In addition, the wear of the head 54 (sliding contact with the disk body 103) caused by the high-speed movement of the carriage 51 can be reduced.

Next, the operation for removing the floppy disk 101 will be explained. In FIG. 12, the push button 84 is manually pushed downward, and the swing lever 83 is moved by the torsion spring 9.
4 and swing it downward. Then, as shown in FIG. 13, the elongated hole 83a of the swing lever 83 moves downward, and the lower leg portion 83d of the elongated hole 83a comes into contact with the frame 12. During this time, the cam portion 83b pushes the cam pin 92b of the engagement lever 92 downward. Push. Therefore, as shown in the figure, the engagement lever 92 rotates slightly clockwise against the torsion spring 94, and the engagement portion 92a disengages the engagement convex portion 79b-5 of the disk holder 79. .

Therefore, the disk holder 79 swings back upward by the torsion spring 82 as shown in FIG.
It returns to contact with -1 and stops.

Therefore, the drive shaft 15 is relatively
03 through the hole 104a of the boss part 104,
Further, the engagement pin 20 comes out of the eccentric engagement hole 104b, and the upper end of the head 54 comes out of the lower slot 102b. Further, the pad holding arm 55 is also rotated back as shown in FIG. 7 by the engagement of the engagement convex portion 55a and the engagement guide portion 79a-5. Therefore, since the floppy disk 101 presses and deforms the pair of spring plates 80, it moves downward due to its own weight and returns to the disk holding portion 7.
It returns to contact with 9b-1. Therefore, it is only necessary to pull out the floppy disk 101 forward. Incidentally, by upward movement of the floppy disk 101, the detection switch 99,1
00 are respectively released.

Next, in FIG. 13, when the pushing force of the push button 84 is released, the swing lever 83 and the engagement lever 92 swing back to the positions shown in FIG. 11 by the torsion springs 94, respectively.

As shown in FIG. 1, the disk holder 79 is further provided with a rectangular hole 123a on the top surface of the ceiling plate portion 79a, which has approximately the same outer shape as the ceiling plate portion 79a and corresponds to the rectangular hole 79a-1. The covered cover 123 is fixed in a laminated manner. Therefore, it is possible to reconfirm the label 105 of the floppy disk 101 inserted into the disk holder 79 through the rectangular holes 79a-1 and 123a, which is very convenient. Further, since the disk holder 79 is provided with a substantially square hole 79a-4 at the rear end, the cover 12
3. When the assembly is completed before installation, this square hole 7
It is very convenient to directly observe and inspect the operation of the pad holding arm 55, the floppy disk 101, and the carriage 51 and its magnetic head 54 when the floppy disk 101 is not inserted through the pad 9a-4.

According to the device 1, one motor 40 performs both the sliding operation of the head 54 and the rotating operation of the disk body 103.
Since the spiral travel can be recorded or reproduced at any time, only one motor is required, which simplifies the configuration and reduces costs.

As described above, according to the magnetic head mounting structure of the present invention, the magnetic head and the L-shaped spring plate are inserted into the storage hole of the head holding member in advance, and a predetermined portion of the magnetic head is pressed with a screw. Since the magnetic head is stored in the storage hole in advance, the amount of displacement during adjustment is relatively small, improving the accuracy of setting the azimuth angle and preventing damage to the magnetic head. In addition, since the overall structure consists of only the storage hole with the protrusion formed integrally with it and its periphery, it can be made smaller, and the number of parts can be reduced by requiring only the screw plate and screw as adjustment members. Moreover, it can be easily assembled in a short time.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a disk holder of a floppy disk device to which an embodiment of the magnetic head mounting structure of the present invention is applied, Fig. 2 is an exploded perspective view of the main parts of the device, and Fig. 3 4 is an exploded perspective view of the reduction mechanism unit of the above device, and FIGS. 5 and 6 are views of the above device before operation with the disk holder removed. 7 and 8 are vertical sectional front views of the device before and after operation, respectively. FIG. 9 is an enlarged vertical sectional view of the disk table portion in FIG. 7. FIG. 10 is an enlarged vertical cross-sectional view of a part of the deceleration mechanism of the above device, FIGS. 11 to 13 are side views of the above device before operation, after operation, and in the operation return state, and FIGS. 14 and 15. The figures are an exploded perspective view and a plan view of the main parts of the head holder of the carriage of the above device, FIG. 16 is a perspective view of the floppy disk, and FIG. 17 is a diagram showing the operational relationship of the floppy disk, guide roller, cam plate, and magnetic head. It is. 11...Floppy disk device, 12...Frame, 14, 33...Support pin, 15...Drive shaft, 16...Disc table, 17...Cam plate, 18-1...Pulley, 18-2...Gear pulley , 18-3 to 18-6... Gear, 20... Engagement pin, 23... Reduction mechanism, 40... Motor, 4
3,97... Circuit board, 51... Carriage, 52
... Carriage body, 53 ... Head holder, 53
a... Head holding part, 53a-1... Storage hole, 5
3a-2...Stepped portion, 53a-3...Protrusion, 53a
-4...screw hole, 54...magnetic head, 55...
Pad holding arm, 55a... engaging convex portion, 57-
1, 57-2...Guide roller, 61...Head biasing spring plate, 61a...Curved portion, 63...Hexagon socket head screw, 64...Pad, 76-1, 76-2
... Guide groove, 79 ... Disc holder, 79b
-5... Engagement convex portion, 83... Rocking lever, 92...
...Engagement lever, 95...Disk positioning block, 99,100...Detection switch, 101...
Flotspid disc, 102...cassette, 103
...The disk itself.

Claims (1)

[Claims for Utility Model Registration] A storage hole in which a protrusion is integrally provided on each of two orthogonal sides on the inside, and the protrusion extends in a direction perpendicular to the axis of the storage hole, with one end of the protrusion extending in the direction perpendicular to the axis of the storage hole. a head holder having a screw hole opening on the side without the ridge; a magnetic head loosely inserted into the storage hole; a spring member which is housed along each side of the magnetic head and presses two orthogonal sides of the magnetic head to a predetermined inside of the housing hole; A mounting structure for a magnetic head comprising a screw member whose contact pressing force against a predetermined portion of the magnetic head is variable.