JPS649668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floppy disk drive device that performs writing and reading by moving a magnetic head and bringing it into contact with a desired position on the disk.

Conventionally, in order to load and unload a magnetic head, a clamp-shaped magnet was installed below a floppy disk (hereinafter referred to as a disk), and the tip of an iron lever operated by the clamp-shaped magnet bypassed the disk. It has a structure that supports the magnetic head on the top side of the disk, and when writing or reading, the clapper magnet is activated, the tip of the iron lever is lowered, and the magnetic head is brought into contact with the disk. .

For this reason, the above-mentioned conventional type has the disadvantage that it cannot be made thinner than the sum of the height of the clapper-shaped magnet, the thickness of the disk, the thickness of the iron lever, the thickness of the magnetic head, and a slight gap. Another drawback was that it required a lot of man-hours to process the iron lever into a complicated shape. Furthermore, since the clapper magnet is located close to the disk or magnetic head, electrical noise or magnetic noise is easily transmitted to the disk or magnetic head, causing write errors or read errors, or preventing information recorded on the disk from being transmitted to the disk or magnetic head. It had the disadvantage that it could be destroyed.

In order to eliminate the above-mentioned drawbacks, the present invention has an arm attached to the magnetic head, an inclined part that contacts the arm from below to lift up the magnetic head, and a pad for preventing disk vibration attached to the lower part of the tip side. A lever is connected to the lever, the tip of which is rotatable in a direction toward and away from the disk and parallel to the direction of movement of the magnetic head, and a plunger is connected to the rear end of the lever, so that the pad comes into contact with the disk when activated. When not in operation, the lever is rotated so that the inclined part lifts the magnetic head part, and a plunger is installed horizontally in a direction parallel to the moving direction of the magnetic head on the rear side of the device outside the mounting range of the disk. The device is characterized by being equipped with a magnet, and will be described in detail below with reference to the drawings.

FIG. 1 is a plan view and side view showing an entire embodiment of the present invention, and FIGS. 2 to 9 are views showing elements of this embodiment. In FIG. 1, as shown in detail in the perspective view of FIG. 2, a right side plate 1a, a left side plate 1b, and a cam portion 1c are integrally molded.
A door has a lock pin 1d fixed to b, and is biased to rotate clockwise by a door spring 1e; 2 is a disk made of a flexible disk with magnetic films formed on both sides enclosed in a jacket; 3 is a disk; As shown in detail in the plan view and side view of FIG. 3, a spring discharge bar 4 is formed by bending a wire to form a slide portion 3a and a hook portion 3b, and 4 guides the disk 2, and as shown in FIG. As shown in detail in the perspective view, the guide has guide bodies 4a and 4b for guiding the ejection bar 3 and a guide groove 4c, and has an inclined block 4d for guiding the sliding portion 3a of the ejection bar 3 to the lock position. Block, 5 is shaft 5a
This is a clamp lever that is rotatably supported on the shaft and biased counterclockwise by a clamp spring 5b, and one end of this clamp lever 5 is attached to the door 1.
It is possible to engage with the upper end surfaces of the right side plate 1a and the left side plate 1b, respectively. A leaf spring 6 has one end fixed to the other end of the clamp lever 5 and the other end supported by the other end of the clamp lever 5;
Reference numeral 7 denotes a collet suspended with play in the leaf spring 6, and the collet 7 can move up and down and swing relative to the leaf spring 6. 8 is a head assembly having a pair of magnetic heads 8a facing an upper block and a lower block, and a head arm 8b on the upper block; 9 is a head pressure spring that biases the upper block of the head assembly 8 downward; 10 is a head pressure spring; The linear motor 11 that drives the head assembly 8 in a straight line has a hole 11a near the fixed end, as shown in detail in the plan view, front view, and side view of FIG. Embossing and molding the embossing part 11
b is provided, and the range A is further bent to form an inclined portion 11c.
A fixed end of the head up lever 11 is fixed to a frame, a free end is supported by a leaf spring 6, and an inclined part 11c is provided.
is in a position where it can support the head arm 8b. 12
As shown in detail in the perspective view of FIG.
It is a plastic L-shaped lever having a shaft 12b, a shaft 12b, a groove 12c, and a pad 12d, and the inclined portion 12a of this L-shaped lever 12 is located at a position where it can support the head arm 8b. Reference numeral 13 is a plunger magnet which is installed horizontally outside the mounting range of the disk 2 and rotates the L-shaped lever 12, and reference numeral 14 is an optical sensor which detects the index hole of the disk 2.

FIG. 7 is a view taken along the line A-A' of the embodiment shown in FIG. A reset lever that rotates as a rotation shaft to move the reset wire 15b provided at the other end up and down, 16 is a torsion spring that biases the reset lever 15 clockwise, and 17 is a discharge spring that biases the discharge bar 3. .

FIG. 8 is a cross-sectional view of the embodiment shown in FIG. The rotating hub 19 has a hole 1 slightly larger than the support shaft, as shown enlarged in Fig. 9.
9a, and a stop surface 19 formed by a zigzag groove having a width that allows the lock pin 1d to pass through.
b, 19c, 19d, 19e and cam surface 19f
This lock lever has a cam surface 19g formed at the tip and a tongue piece 19h inclined toward the stopper surface 19d, and the cam surface 19g of the lock lever 19 receives rotational force from the lock pin 1d.
The cam surface 19f is shaped to temporarily stop the lock pin 1d, the stopper surfaces 19b and 19c hold the lock pin 1d at the lock position, and the stopper surface 19d is shaped to temporarily stop the lock pin 1d at the release position. 20 is a coil spring that presses the lock lever 19 perpendicularly to the plane of the paper. Incidentally, the inclined surfaces of the inclined portion 11c of the head lift lever 11 and the inclined portion 12 of the L-shaped lever 12 are formed at an inclined angle so as to be parallel to the disk 2 when the magnetic head 8a is lifted.

In the above configuration, the door opening/closing mechanism will first be explained with reference to the explanatory diagrams of FIG. 10 and FIG. 11. First, when the door 1 is closed, the lock pin 1d of the door 1 is engaged with the stopper surfaces 19b, 19c of the lock lever 19 and held in the locked position, as shown in FIG. 10a. When the door 1 is pushed in the direction of the arrow, the lock pin 1d contacts the stopper surface 19e and then moves to a position where it contacts the stopper surface 19e, as shown in FIG. 10b. The state of engagement between the lock pin 1d and the lock lever 19 at this time is shown in a cross-sectional view as viewed from above as shown in FIG. 11a. Next, when the pressure is released by releasing the hand, the door 1 rotates clockwise due to the biasing force of the door spring 1e, so that the lock pin 1d pushes away the tongue 19h of the lock lever 19, as shown in FIG. 11b. The door 1 is then released from the lock lever 19 and the door 1 opens as shown in FIG. 10c. At this time, the lock lever 19 is inclined as shown in FIG. 11b because the hole 19a is slightly larger than the support shaft, so there is play between the lock lever 19 and the support shaft. This is due to the support structure having a large degree of freedom in that it is pressed and supported by the biasing force of . Further, when the door 1 is rotated counterclockwise against the biasing force of the coil spring 1e, the cam surface 19g receives rotational force from the lock pin 1d, and the lock lever 19 rotates, as shown in FIG. 10d. Then, the lock pin 1d comes into contact with the cam surface 19f of the lock lever 19 and stops. When the pressure is released by releasing the hand after this, the lock lever 19 rotates counterclockwise under the biasing force of a spring (not shown). As a result, the lock pin 1d enters the groove and the stopper surface 19b of the lock lever 19,
The door 1 returns to the state held at 19c, that is, the state shown in FIG. 10a, and the door 1 is closed.

Next, the disk ejection mechanism will be explained with reference to the explanatory diagrams of FIGS. 12 and 13. First, when the door 1 is open, as shown in FIG. 12a, the cam portion 1c of the door 1 stops one end of the reset lever 15, and rotation of the reset lever 15 is suppressed. Furthermore, since the disk has not yet been inserted, the ejection bar 3 is positioned farthest to the left due to the biasing force of the ejection spring 17. In this state, disk 2 is inserted from the left side.
When the disc 2 is inserted, the right end portion of the disk 2 enters the hook portion 3b of the ejection bar 3 while pushing it apart, and further moves the ejection bar 3 to the right against the biasing force of the ejection spring 17. The discharge bar 3 is guided by the guide bodies 4a and 4b and the guide groove 4c of the guide block 4 shown in FIG. At this time, the slide portion 3a falls down as shown in FIG. 12b due to the springiness of the ejection bar 3 itself. Insertion of disk 2 is now complete, and disk 2 will not pop out in this state. Next, as shown in Figure 12c, the door 1
When the cam part 1c is closed, the cam part 1c rotates and escapes upward, so that the reset lever 15 engages the torsion spring 1.
The biasing force of 6 causes the reset wire 15b to rotate clockwise about the shaft 15a, thereby lowering the reset wire 15b. Next, when the door 1 is opened as shown in FIG.
The reset lever 15 is rotated clockwise against the biasing force, and the reset wire 15b is raised.
The slide portion 3a of the discharge bar 3 is pushed up by this reset wire 15b, and the inclined block 4d
Get over it. As a result, the ejection bar 3 is moved to the left by the biasing force of the ejection spring 17, and the disk 2 is ejected. However, since the right end of the disk 2 is held by the hook portion 3b, it remains in the state shown in FIG. 4d, and the disk 2 does not fly out any further to the left. This effect is particularly remarkable when the disk 2 has the cross-sectional shape shown in FIG. In other words, disks currently on the market are usually 5.25 inches and 8 inches in size,
In many cases, the ends of the jacket are folded back and glued together, so the ends are thicker than the center, forming a step d. Therefore, in order for the disk 2 to become free, a force is required to further spread the hook portion 3b, and the disk 2 cannot easily pop out.

Next, the collet lifting mechanism will be explained with reference to the explanatory diagrams of FIGS. 14 and 15. First, when the door 1 is opened as described above, the clamp lever 5 rotates clockwise under the biasing force of the clamp spring 5b shown in FIG.
Lift it up as shown in Figure 14A. This leaf spring 6 lifts the tip of the head up lever 11,
This head up lever 11 engages with the head arm 8b and lifts the head arm 8b. Therefore, the upper unit of the head assembly 8 rises against the biasing force of the head pressure spring 9, and the magnetic head 8a on the upper unit side separates from the disk 2. In this state, the disk 2 can be inserted and ejected. When the door 1 is closed after inserting the disk 2, the upper end surface of the left side plate 1b of the door 1 engages with the clamp lever 5, and the clamp lever 5 is rotated counterclockwise. Therefore, as shown in FIG. 14B, the collet 7 presses the disc 2 against the hub 18, and the disc 2 is held between the collet 7 and the hub 18. This process will be explained in more detail with reference to FIG. First, in the illustrated state, the collet 7 is simply suspended from the leaf spring 6, and can move quite freely within certain limits. Next, when the leaf spring 6 descends, the conical surface formed at the bottom of the collet 7 comes into contact with the disk 2, applying a horizontal component force to the disk 2. At this time, collect 7
Since the collet 7 can move freely as described above, the collet 7 itself escapes before an excessive force is applied to the disc 2, and it does not bite the disc 2. When the disk 2 is thus moved to its normal position and is held between the collet 7 and the hub 18, the collet 7 cannot be lowered. Therefore, the free end of the leaf spring 6 is left behind from the clamp lever 5 and comes to press the collet 7. With this mechanism, even if the leaf spring 6 is a sufficiently strong spring, the operation of the door 1 is easy, and the structure that suspends and supports the collet 7 is extremely thin.

Next, the head elevating mechanism will be explained with reference to the explanatory diagrams of FIGS. 14 and 16. First, when the door 1 is opened as described above, the tip of the head lever 11 is lifted by the leaf spring 6. As shown in FIG. 5, this head up lever 11 has a spring portion where the hole 11a is provided, and a rigid portion where the protrusion portion 11b is provided, so that it rotates around the hole 11a and the inclined portion At 11c, it engages with the head arm 8b and lifts the head arm 8b. Therefore, the upper unit of the head assembly 8 rises against the biasing force of the head pressure spring 9, and the magnetic head 8a is lifted. Next, when the door 1 is closed, the leaf spring 6 lowers and the head lever 11 lowers. While the head up lever 11 is lowering, the head arm 8b
As shown in FIG. 16A, the L-shaped lever 12 is stopped by the inclined portion 12a and left behind. Next, a flat motor (not shown) is driven to rotate the hub 18. At this time, as described above, the disk 2 is held between the collet 7 and the hub 18 by the biasing force of the leaf spring 6, so that the disk 2 rotates. Furthermore, the linear motor 10 is driven to move the head assembly 8 in the radial direction of the disk 2, and the magnetic head section 8a is positioned on a desired track on the disk 2. After that, when the plunger magnet 13 is activated and the L-shaped lever 12 is rotated counterclockwise about the shaft 12b, the pad 12d descends and lightly presses the disk 2, as shown in FIG. 16B. do. Further, when the L-shaped lever 12 is lowered, the head arm 8b also lowers part way, but as shown in FIG. 8
b is left behind. Therefore, in this state, the magnetic head 8a presses the disk 2 due to the biasing force of the head pressure spring 9. Next, desired information is written on the disk 2 by the magnetic head 8a, or information written on the disk 2 is read out. When all writing and reading of information is completed, the plunger magnet 13 is deactivated. As a result, the L-shaped lever 12 rotates clockwise about the shaft 12b, and the pad 12d separates from the disk 2. Also, since the L-shaped lever 12 lifts the head arm 8b, the head assembly 8 rises and the magnetic head 8a separates from the disk 2. Next, the flat motor (not shown) is stopped to stop the disk 2.

Note that the head up lever 11 has an inclined portion 11c.
In addition, the L-shaped lever 12 is provided with an inclined portion 12a, and each inclined surface becomes parallel to the disk 2 when the magnetic head 8a is lifted, so that even if the linear motor 10 moves the magnetic head 8a, The amount of elevation is constant. Furthermore, even if the plunger magnet 13 is in operation, if the door 1 is opened,
The head lift lever 11 is lifted by the leaf spring 6, and lifts the head arm 8b. Therefore, when the door 1 is opened, the magnetic head 8a is always separated from the disk 2, and writing and reading are no longer possible.

The L-shaped lever used in the present invention has a simple shape and a short span, so it can be made of plastic as in the embodiment. Molding this plastic L-shaped lever reduces the number of processing steps, and unlike conventional iron levers, it does not transmit electrical or magnetic noise, which has the advantage of reducing write and read errors. .

As explained in detail above, according to the present invention, since the plunger magnet is installed outside the mounting range of the disk, it is difficult for electrical noise and magnetic noise to be transmitted to the disk and magnetic head, thereby reducing write errors and read errors. Errors are reduced.

The plunger magnet is installed horizontally in a direction parallel to the direction of movement of the magnetic head and outside the disk mounting range, and the lever rotated by this plunger magnet is also installed parallel to the direction of movement of the magnetic head. Since the head portion is lifted by a plunger that operates not in the thickness direction of the device but in a direction perpendicular to the thickness direction, it is possible to reduce the thickness of the device to approximately the height of the plunger magnet.

Since the lever that lifts up the magnetic head is located parallel to the moving direction of the magnetic head, a part of the lever itself that comes into contact with the arm of the magnetic head to lift it can be provided as a part of the lever itself, and this part is tilted. This makes it possible to always lift the magnetic head by a certain amount regardless of whether the lever is rotated to a certain angular position or the magnetic head is at a stopped track position, making the magnetic head lifting mechanism more compact. becomes possible.

A pad that prevents disc vibration is attached to the lever that lifts the magnetic head.
Since there is no need to separately provide a member for pressing the pad against the disk, and there is no need for a structure for interlocking this member with the lever, the mechanism is simplified.

There are effects such as

[Brief explanation of the drawing]

FIG. 1 is a plan view and side view showing an embodiment of the present invention, FIGS. 2 to 9 are views showing each element of the embodiment shown in FIG. 1, and FIG. 2 is a perspective view of a door. , FIG. 3 is a plan view and a side view of the ejection bar, FIG. 4 is a perspective view of the guide block, FIG. 5 is a plan view, front view, and side view of the head up lever, and FIG.
The figure is a perspective view of the L-shaped lever, FIG. 7 is a view taken along the A-A' plane of the embodiment shown in FIG. An arrow view showing the example cut along the plane B-B', FIG. 9 is a diagram showing the lock lever, FIGS. 10 and 11 are explanatory diagrams of the operation of the door opening/closing mechanism, and FIGS. 12 and 13. 14 is an explanatory diagram of the operation of the disk ejection mechanism, FIG. 14 is an explanatory diagram of the operation of the disk clamp mechanism and head lifting mechanism, FIG. Partial side view of the mechanism. 1...Door, 1a...Right side board, 1b...Left side board, 1c
...Cam part, 1d...Lock pin, 1e...Door spring, 2...Disc, 3...Ejection bar, 3a...Slide part, 3b...Hook part, 4...Guide block,
4a and 4b...guide body, 4c...guide groove, 4
d...Tilt block, 5...Clamp lever, 5a...
Shaft, 5b... Clamp spring, 6... Leaf spring, 7
...Collect, 8...Head assembly, 8a...Magnetic head, 8b...Head arm, 9...Head pressure spring, 10...Linear motor, 11...Head up lever, 11a...Hole, 11b...Ejection portion,
11c... Slanted part, 12... L-shaped lever, 12a... Slanted part, 12b... Shaft, 12c... Groove, 12d... Pad,
13... Plunger magnet, 14... Optical sensor, 15... Reset lever, 15a... Shaft, 15b...
Reset wire, 16...Torsion spring,
17... Discharge spring, 18... Hub, 19... Lock lever, 19a... Hole, 19b, 19c, 19d and 19e... Stopper surface, 19f and 19g...
Cam surface, 20...Coil spring.

Claims (1)

[Scope of Claims] 1. A floppy disk drive device that performs writing and reading by moving a magnetic head and bringing it into contact with a desired position on the disk, which comprises: an arm attached to the magnetic head; and an arm that comes into contact with the arm from below. It has an inclined part that lifts the magnetic head part and a pad for preventing disk vibration attached to the lower part of the tip side, and the tip part is rotatable in the direction of approaching and separating from the disk and is installed parallel to the direction of movement of the magnetic head. A lever is connected to a plunger on the rear end side of the lever, and the lever is rotated so that the pad comes into contact with the disk when activated and so that the inclined part lifts up the magnetic head when not activated,
A floppy disk drive device further comprising: a plunger magnet installed horizontally in a direction parallel to the moving direction of the magnetic head on the rear side of the device outside the device range of the disk.