JPH0222839Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a floppy disk device, in which a reduction gear provided on the lower surface of a drive shaft for driving a floppy disk holds a coil spring that biases a disk locking engagement pin provided on the drive shaft. It is an object of the present invention to provide a floppy disk device whose configuration can be simplified.

In conventional floppy disk devices, there are two methods for driving the drive shaft for rotating the floppy disk: one is to directly drive the drive shaft with a motor, and the other is to reduce the driving force of the motor through a deceleration mechanism. There is a method of rotating the shaft.

Although the former method does not require a speed reduction mechanism, it requires the use of a flat coreless motor or the like, which has the disadvantage of increasing costs.

On the other hand, although the latter method requires a reduction mechanism, it can use a normal, inexpensive DC motor, and has the advantage that the total cost is much lower than the former method.

Furthermore, in both of the above two conventional methods, an engaging pin fitted into an axially stepped hole provided at an eccentric position of the drive shaft is arranged so as to protrude upward under the bias of a coil spring. The drive shaft and the disk were configured to rotate together by being fitted into the eccentric hole of the floppy disk.

However, this method has the disadvantage that a holding member for holding the coil spring needs to be fixed to the lower end of the stepped hole, making the structure and assembly complicated.

Therefore, the present invention adopts the latter method of using a speed reduction mechanism and a normal motor to reduce costs, and also uses gears in the speed reduction mechanism to double as the coil spring holding member, simplifying the configuration and assembly. It is designed so that it can be transformed into

Next, one example thereof will be explained.

Fig. 1 is a plan view of the floppy disk device according to the present invention when the disk holder is moved upward, Fig. 2 is a longitudinal cross-sectional view taken along the line - in Fig. 1, and Figs. 3 and 4 respectively show the disk of the above device. The bottom view and side view when the holder is moved upward, and FIGS. 6 and 10 are respectively a vertical arrow view taken along the line in FIG. 1 and FIG. 6.
FIG.

In the figure, the floppy disk device 1 has a frame 2, and the frame 2 has a pair of cutout plates 2 on the upper rear side.
a and two pairs of bent plate portions 2b and 2c on the lower four sides.

Reference numeral 3 denotes a drive rotary body, which is made up of a large-diameter resin gear 5 concentrically fixed to the lower surface of a metal drive shaft 4 with screws 6. The drive shaft 4 has a central shaft portion 4a on its upper end surface, an axially stepped hole 4b at a position eccentric from the center, and is rotatably mounted on a bearing 7 made by Shinchiyu, which is fitted and fixed in the central hole 2d of the frame 2. Inserted.

The gear 5 has an upper surface convex portion 5a and a penetration detection hole 5b at different radial positions on the same radial direction, and when fixed to the drive shaft 4, the convex portion 5a is fitted into the lower end of the stepped hole 4b, so that the gear 5 is connected to the drive shaft 4. On the other hand, it can be mounted in a relatively limited position in the circumferential direction.

Reference numeral 8 denotes disk locking means, which is composed of a stepped engagement pin 16 and a coil spring 9. The engagement pin 16 is inserted from below into the stepped hole 4b of the drive shaft 4, and is biased upward by the coil spring 9 housed in the stepped hole 4b, so that the stepped portions abut each other, and the upper end of the pin moves upward. It stands out. The lower end of the coil spring 9 is connected to the large diameter gear 5.
It is held by the convex portion 5a. In this way, the engagement pin 8, the convex portion 5a, and the detection hole 5b in the driving rotary body 3 are arranged on the same radial direction line.

Reference numeral 10 denotes a motor, which is fixed to a support plate 11 fixed to the lower surface of the frame 2, and its coaxial gear 12 is connected to a pin 1.
3 (gear parts 14a, 14b)
are sequentially meshed and connected to the gear 5 through the
2, 14, and 5 constitute a deceleration mechanism 15.

Reference numeral 21 denotes a detection mechanism, and as shown in FIGS. 2 and 3, a U-shaped portion is fixed to the lower surface of the frame 2 so as to sandwich the vicinity of the outer periphery of the large-diameter gear 5, and light emitting elements are attached to the upper and lower portions of the U-shaped portion, respectively. and a light receiving element (not shown).

22 is a 4-channel magnetic head, which is fixed to the lower surface of the frame 2 by a support 17 as shown in FIG.
As shown in FIGS. 6 and 10, the upper end of the head 22 protrudes from the upper surface of the frame 2 by a predetermined amount. As shown in FIG.
Concentric recording and reproducing lines 33a with different diameters of books
33d, four head portions 22a to 2 respectively correspond to
It has 2d.

23 is a disk holder, which includes an upper holder half 23-1 made of a resin plate and a lower holder half 2 made of a metal plate having a U-shaped cross section.
3-2 is fitted and screwed together, and both 23-
1, flat storage hole 23 with front opening between 23 and 2
a is formed. The upper holder half 23-1 includes a central hole 23b, a recess 23c for housing a pad holder arm 25, which will be described later, and a pair of support plates 23 on the lower rear side.
d, and the lower holder half 23-2 has a central hole 23.
e, head insertion hole 23f, right side pin part 23g
(shown in Figures 2 and 4), rear stopper plate 2
3h, and has a lower surface leg portion 23i. The disk holder 23 has a pair of support plate parts 23d relative to the frame 2.
The frame 2 is pivotably supported around a long pin 24 that is commonly inserted through the pair of cut and raised plate portions 2a of the frame 2 as a fulcrum.

Reference numeral 25 denotes a metal pad holder arm, which is swingably supported by a pin 26 within a recess 23c of the upper holder half 23-1 as shown in FIG. It has an end pad 27 and a pin portion 25b. The pad holder arm 25 is wound around the pin 26, and has both ends connected to the recessed portion 23c and the pin portion 25.
Although it is biased counterclockwise in FIG. 10 by a torsion spring 28 engaged with b, when the disk holder 23 moves upward as shown in the figure, the engaging portion 25a engages the stopper convex portion of the stopper plate 29, which will be described later. 29c and is at the clockwise rocking limit, pad 2
7 is displaced upward.

Reference numeral 29 denotes a stopper plate with an L-shaped cross section, which is fixed to the upper surface of the frame 2 with screws 30, and as shown in FIGS.
b. It has a rear stopper convex portion 29c.

30 is a toggle spring, one end of which is attached to disk holder 2
3, and the other end is locked to the pin portion 29b of the stopper plate 29, and the spring force is stored in the opening direction of the one end and the other end.
In FIG. 4, the disk holder 23 is biased upward through the pin portion 23g by the spring force of the toggle spring 30, and is in an upward movement position where the pin portion 23g abuts the lower end of the stopper convex portion 29a.

Reference numeral 31 designates a floppy disk, as shown in FIG. 9, in which a disk-shaped disk body 33 having the four concentric recording/reproducing lines 33a to 33d is rotatably housed in a rectangular paper disk case 32.
The disk case 32 has a circular hole 32a and a rear groove hole 32b on the upper and lower sides, respectively, and a center hole 33e and an eccentric engagement hole 33f of the disk body 33 peek out through the circular hole 32a.

Next, the operation of the device 1 will be explained. 6th
10, the floppy disk 31 is inserted into the storage hole 23a of the disk holder 23 from the front, and the rear end of the disk case 32 is inserted into the stopper plate part 2.
3h and store it.

Next, when the disk holder 23 is manually pushed down against the spring force of the toggle spring 30, the holder 23 clickly swings downward under the action of the toggle spring 30, and the lower leg portion 23i comes into contact with the upper surface of the frame 2. When they are in contact with each other, the states shown in FIGS. 5, 7, and 11 are obtained. The disk holder 23 is biased downward by the spring force of the toggle spring 30 and is biased and held in the downward movement position. As a result, as shown in FIG. 7, the shaft portion 4a of the drive shaft 4 passes through the hole 33e of the disk body 33 through the center hole 23e of the lower holder half 23-2 and the lower center hole 32a of the disk case 32 in order.
the upper case half 23-1.
The disk main body 33 is loosely inserted into the central hole 23b of the drive shaft 4, and the disk main body 33 is placed close to the upper surface of the drive shaft 4.

At this time, since the disk body 33 is at an arbitrary rotational position, the eccentric engagement hole 33f is located at the engagement pin 16.
It does not correspond to the vertical direction. Therefore, the engagement pin 16 is pushed down by the disk body 33 against the spring 9 until the upper end of the pin substantially coincides with the upper surface of the drive shaft 4, as shown in FIG.

At the same time, in FIG. 7, the upper end of the head 22 is relatively connected to the hole 23f of the lower half body 23-2 and the disk case 3.
2 through the lower slot 32b of the disk body 3.
3. Contact the bottom surface.

At the same time, as shown in FIG. 11, the pad holder arm 25 itself moves downward from the position shown in FIG. Therefore, the pad holder arm 25 is swung counterclockwise by the torsion spring 28, and the pad 27 is moved toward the disk case 32.
The disk body 33 is pressed against the upper surface of the disk body 33 through the upper circular hole 32a, and the disk body 33 is in pressure contact with the upper surface of the disk body 33 through the upper circular hole 32a.
Lightly press and hold.

Next, the motor 10 is started for a short time to reduce the speed reduction mechanism 1.
5 (gears 12, 14, 5)
For example, start rotating clockwise at low speed.
Then, the engagement pin 16 also rotates while the upper end of the pin comes into sliding contact with the lower surface of the disk body 33.
At a circumferential position corresponding to the eccentric engagement hole 33f, the engagement hole 33f is moved upward by the bias of the coil spring 9.
After that, the drive shaft 4 and the disk body 33 are in a state of integral rotation. Incidentally, in order to realize the above-mentioned engagement, it is sufficient to rotate the driving rotary body 3 by one rotation at most.

Next, the motor 10 is started again to start driving the drive rotating body 3 and the disk body 33 to rotate integrally. As a result, the large diameter gear 5 also rotates in the clockwise direction of the arrow in FIG.
The light reaches the position between the light receiving element and the light emitting element, and passes through the hole 5b. Therefore, the signal from the light receiving element is sent to the circuit, and the circuit outputs a signal that allows the head 22 to start recording or reproducing. That is, in FIG. 12, the disk body 33 has its engagement hole 33f.
The radial line that contacts the head 22 when the engaging pin 16 and the detection hole 5b (located on the same radial direction) coincides with the detection mechanism 21 in the radial direction is the recording/reproduction start line 33g, and both radial directions are mutually The circumferential angle θ formed can be set to a predetermined value in advance.

Subsequently, the motor 10 is driven to drive the disk body 3.
3 rotates in the direction of the arrow in FIG. 12, only the first (outermost) head portion 22a of the head 22 is excited, and recording or reproduction is performed on the first (outermost) recording/reproducing line 33a. Ru.

When the disk body 33 completes one rotation, the excitation of the head portion 22a is released and the two
The second head section 22b is excited, and then recording or reproduction is performed on the second recording/reproducing line 33b. Thus, the recording/reproducing lines 33b, 33c,
Head portions 22b, 22 are provided for each round of 33d, respectively.
Recording or reproduction is performed sequentially by c and 22d,
When one round of recording or reproducing on the fourth (innermost) recording/reproducing line 33d is completed, the motor 10 is stopped and the rotation of the disk body 33 is also stopped. Note that recording or playback does not necessarily start at line 3 in Figure 12.
It is not necessary to start from 3g, but it may start from a position delayed by a predetermined angle in the circumferential direction from line 33g in the same figure by a delay signal from the circuit.

To take out the floppy disk 31, the disk holder 23 can be manually swung upward and returned to the position shown in FIGS. It returns to contact with the lower end of the convex portion 29a, and this state is maintained by the toggle spring 30. Therefore, relatively, the shaft portion 4a comes out of the center hole 33e of the disk body 33, the engagement pin 16 comes out of the engagement hole 33f, and the upper end of the head 22 comes out of the lower slot 32b. Further, the pad holder arm 25 has its engaging portion 25a connected to the stopper convex portion 2 of the stopper plate 29.
When the pad 9c comes into contact with the lower end of the pad 9c and returns to rotation as shown in FIG. 10, the pad 27 also escapes from the upper slot 32b and is displaced. Therefore, it is only necessary to grasp the front end of the floppy disk 31 and pull it out forward.

According to the device 1, the head 22 is of a multi-head type so that recording or reproduction can be performed on the disk body 33 along a plurality of concentric circles, so that the conventional head having only one head can be slid in steps. Compared to the previous model, the configuration is simpler as there is no need for a step motor or slide mechanism, and there is no hassle of assembly and adjustment, reducing man-hours and reducing the number of parts, improving reliability and reducing costs. I can do it.

Further, according to the device 1, the disk detection mechanism 21
The objects detected by the light-receiving and light-emitting elements are forward and backward movement,
The large diameter gear 5 only rotates instead of the disk body 33 that moves over a wide range of movements such as vertical movement and rotation.
Because of the configuration for detecting the detection hole 5b, both elements can be placed close to the upper and lower surfaces of the large-diameter gear 5 and easily aligned with the rotational axis trace of the detection hole 5b.
The position setting work is easy and the reliability can be improved.

In addition, in the drive rotating body 31, the large diameter gear 5 included in the reduction mechanism 15 is fixed to the lower surface of the drive shaft 4 and also serves to hold the lower end of the coil spring 9, so a member for holding the lower end of the coil spring 9 is not particularly required. First, the configuration and assembly can be simplified.

Furthermore, since the convex portion 5a provided in the same radial direction as the detection hole 5b of the large-diameter gear 5 is fitted into the stepped hole 4b that accommodates the coil spring 9, the engagement pin 16 and the detection hole 5b can be easily inserted. The recording/reproduction start line 33g of the disk body 33 can be easily set by setting the large diameter gear 5 on the same radial direction, and the large diameter gear 5 can be easily set on the drive shaft 4 by fitting into the convex portion 5a and the stepped hole 4b. It can be configured to rotate integrally with respect to the

Furthermore, since the pad holder arm 25 is configured to swing in conjunction with the swinging of the disk holder 23, it does not require a particular drive source for swinging and is easy to configure and assemble. The arm 25 can improve reliability without damaging the arm 25 itself and the disk 31 by swinging away from the disk 31, and when the disk holder 23 swings downward, it swings close to the disk 31 and the pad 27 The disc body 33 is pressed into contact with the head 22 reliably, and the recording and reproducing performance can be improved.

In the above embodiment, the engagement pin 16 and the detection hole 5b are on the same radial line, but they may be on different radial lines.

Further, the head 22 has four magnetic head sections 22a to 2.
2d, but it may have three or less or five or more head parts.

As described above, according to the floppy disk device of the present invention, the rotating body included in the speed reduction mechanism is fixed to the lower surface of the drive shaft and holds the lower end of the spring means that biases the engagement pin. In particular, it has features such as not requiring a member for holding the spring means and simplifying the structure and assembly.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the floppy disk device according to the present invention when the disk holder is moved upward, Fig. 2 is a longitudinal cross-sectional view taken along the line - in Fig. 1, and Figs. 3 and 4 respectively show the disk of the above device. A bottom view and a side view when the holder is moved upward, FIG. 5 is a side view when the disk holder of the above device is moved downward, and FIGS. 6 and 10 are respectively
7 and 11 are respectively a vertical sectional side view and a longitudinal sectional front view when the disk holder is moved downward, and FIG. The figure is a longitudinal partial view showing the operating state of Figure 7, Figure 9 is a perspective view of the floppy disk, and Figure 1 is a perspective view of the floppy disk.
FIG. 2 is a schematic plan view showing the relationship between the above device and a floppy disk. DESCRIPTION OF SYMBOLS 1... Floppy disk device, 3... Drive rotating body, 4... Drive shaft, 4a... Shaft part, 4b... Stepped hole, 5... Large diameter gear, 5a... Convex part, 5b... Detection hole , 8... Disk locking means, 9... Coil spring, 10... Motor, 15... Speed reduction mechanism, 16...
...Engagement pin, 21...Detection mechanism, 22...Head, 22a to 22d...Head part, 23...Disc holder, 25...Pad holder arm, 27
...Pad, 29...Stopper plate, 30...Toggle spring, 31...Flotspi disc, 33...
Disk body, 33a to 33d...recording/reproducing line, 33f...engaging hole.

Claims (1)

[Scope of utility model registration request] A floppy disk is rotatably supported on the frame by having a frame, a central shaft protruding from one end surface thereof, and a stepped through hole provided in the axial direction at a position eccentric from the center. A drive shaft that is fitted and attached to the shaft portion on the end face side, an engagement pin that is fitted into the stepped hole, and the engagement pin that is housed in the stepped hole and is biased to protrude upward from the drive shaft. a locking means consisting of a spring means which is inserted into and engaged with the eccentric hole of the floppy disk and rotationally locks the floppy disk with respect to the drive shaft; a rotating body fixed to the frame, a drive source fixed to the frame, a deceleration mechanism including the rotating body, decelerating the driving force of the drive source and transmitting it to the drive shaft, and a deceleration mechanism fixed to the frame. , a head for recording or reproducing data on the floppy disk, and the rotating body is configured to hold the spring means.