JPH021752Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a double-sided floppy disk drive device used as an external storage device for various information devices. More specifically, the present invention relates to a double-sided floppy disk drive device in which the clamp member and the upper head assembly are lowered by manual rotation of the clamp shaft to make the device ready for operation.

(Background of the invention and problems with the prior art) A double-sided floppy disk drive device includes an upper head assembly and a lower head assembly each having a magnetic head that contacts both sides of a magnetic disk. Both head assemblies are moved radially relative to the disk to write/read information.
Usually, the upper head assembly is elastically biased toward the lower head assembly by a spring,
These springs allow each magnetic head to contact the magnetic disk inserted between both head assemblies with a predetermined pressure contact force, and when the magnetic disk is pulled out, the upper head assembly is moved downward. It is adapted to be lifted away from the side head assembly and held in this position.

In such a mechanism, when the upper head assembly is released from the upper restraint state when no magnetic disk is inserted, the magnetic head of the upper head assembly collides with the magnetic head of the lower head assembly, causing an extremely dangerous situation. Both magnetic heads have mirror-finished surfaces with high precision, creating a "socket".
This caused damage to the gimbal spring, magnetic head, etc.

To solve this problem, various mechanisms have been proposed that prevent the upper magnetic head assembly from descending toward the lower head assembly when the magnetic disk is not inserted. For example, an eject mechanism that detects whether the magnetic disk is inserted or not inserted and controls the upper magnetic head restraining member is often used, but all of these types of mechanisms have complicated structures. In addition, members such as a rotating lever that detects insertion of the magnetic head prevent the magnetic disk (jacket) from moving even when the magnetic disk is in the clamped state.
There were many parts that applied a load by contacting the disc, and there were also concerns about the reliability of the disc rotation. Also,
The above-described restraint/release control mechanism of the restraint member of the upper head assembly and the clamp state control mechanism of the clamp member of the magnetic disk are controlled separately,
If only the former responds to the insertion/non-insertion state of the magnetic disk, the clamping member may be "mischievously" clamped when the magnetic disk is not inserted, which is not preferable.

(Purpose of the invention) Therefore, the object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to prevent the upper head assembly from coming into contact with the lower head assembly when the magnetic disk is not inserted, and to prevent the upper head assembly from contacting the lower head assembly when the magnetic disk is inserted. To provide a double-sided floppy disk drive device with a magnetic head protection mechanism with high operational reliability, in which a member that comes into contact and detects insertion is separated from the magnetic disk when the magnetic disk is clamped.

Another object of the present invention is to simplify the mechanism by using the clamp shaft as a part of the magnetic head protection mechanism, improve the space factor, and eliminate the need for inserting the magnetic disk. In some situations, clamping is also disabled.

(Structure of the Invention) In order to achieve the above object, the double-sided floppy disk drive device of the present invention has a clamp shaft that can be manually operated from the front of the device body, and a magnetic disk attached to the spindle by rotation of the clamp shaft. a clamp member that presses the center part, an upper head assembly that is always elastically biased toward the lower head assembly, and a position where the upper head assembly is spaced a predetermined distance from the lower head assembly when the clamp member is in an unclamped state. an upper head restraining member that restrains and holds the clamp shaft and releases the restraint state to press the upper head assembly via the magnetic disk in response to rotation of the clamp shaft; and an upper head restraining member that is tiltably inserted into and held by the clamp shaft. a lock cam for controlling the rotation of the clamp shaft, which is always elastically biased in a constant tilting direction by a spring; and a clamp that engages with the lock cam to prevent rotation of the clamp shaft when the magnetic disk is not inserted. The lock cam includes a protrusion on the shaft and an actuating portion of the lock cam that tilts the lock cam to a position where it comes into contact with the magnetic disk when the magnetic disk is inserted and allows rotation of the clamp shaft, and is rotatable by the tilting of the lock cam. The present invention is characterized in that the rotation of the clamp shaft causes the lock cam to further tilt, thereby separating the operating portion of the lock cam from the magnetic disk.

(Embodiment of the invention) The details of the invention will be explained below with reference to an illustrated embodiment. FIG. 1 is a simplified perspective view showing the entire main mechanism, FIG. 2 is a perspective view showing a clamp shaft and a lock cam, and FIGS. 3 to 5 are explanatory views of the operation.

In Fig. 1, reference numeral 1 denotes a clamp shaft rotatably supported by a predetermined amount on a support plate 2 of the apparatus main body, and its tip protrudes outward from the front plate 3 of the apparatus main body (see Figs. 3 to 5). An operating lever 4 is attached to the section.
The clamp shaft 1 has a rotation range of 90 degrees as shown by arrows A and B in FIG. It's getting old.
5 is a lock cam for controlling the rotation of the clamp shaft 1 to be enabled or disabled;
It is inserted and held in such a way that it can be tilted freely, and a tilting force in the direction of arrow C in the figure is applied by a spring 6. In the state shown in FIG. 1, that is, in the state in which the magnetic disk is not inserted, the horizontal surface 5a-1 of the locking portion 5a of the lock cam 5 (see FIGS. 2 to 5) is
The clamp shaft 1 cannot be rotated because it is engaged with a horizontal pin 1a (protrusion) that is implanted and fixed through the clamp shaft 1.

7 is a push-down cam attached to the clamp shaft 1;
Reference numeral 8 denotes a push-down plate whose proximal end on the broken side is held so as to be rotatable by a predetermined amount. Therefore, the protrusion 8a on the free end side is pushed down. Reference numeral 9 denotes a clamp member holding plate, the proximal end of which is held so as to be rotatable by a predetermined amount, and a clamp member 10 composed of a hub, a coil spring, etc. is attached to the free end of the plate. There is. The clamp member holding plate 9 holds the spring 1
1 applies a rotational force in the direction of arrow D in the figure, and in the state shown in FIG. 1, the protrusion 8a of the push-down plate 8 that is in contact with the upper surface of the push-down plate 8 is lifted up. 12
is a spindle for driving and rotating the magnetic disk, which rotates the clamp shaft 1 in the direction of arrow B, and presses down the clamp member holding plate 9 into a clamped state via the push-down cam 7 and the push-down plate 8. At this time, the magnetic disk is rotated by clamping the magnetic disk between the spindle 12 and a clamp member 10 inserted into the center hole of the magnetic disk.

Reference numeral 13 denotes a disk pad lever, which is an upper head restraining member, and is held by the chassis plate 14 of the main body of the device so as to be able to rotate by a predetermined amount, and is provided with a rotational force by a spring 15 in the direction of arrow E in the figure. Granted. Reference numeral 13a denotes an extending portion of the disk lever 13, which is in contact with the lower surface of the arm 9a of the clamp member holding plate 9 in the state shown in FIG. (rotation in the opposite direction of arrow D) causes the disk pad lever 13 to be pushed down. 13b is a lift portion of the disk pad lever 13, which is attached to the upper head assembly 1 described later.
7, and lifts up the upper head assembly 17 in the state shown in FIG.

16 are an upper head assembly 17 and a lower head assembly 1 each having a magnetic disk attached thereto.
8, which is adapted to be transported along guide rods 19, 19 by a stepping motor. The upper head assembly 17 is coupled to the lower head assembly 18 via a leaf spring 20 so as to be rotatable by a predetermined amount, and is also coupled to the lower head assembly 18 by a spring 21 in the downward direction shown by the arrow (lower head assembly 18). 18 side) is applied.

Therefore, as is clear from the above configuration, if the operating lever 4 is manually rotated 90 degrees in the direction of arrow B, the clamp shaft 1 will also be rotated 90 degrees, causing the push-down cam 7 and the push-down plate 8 to be rotated. Clamp member holding plate 9
is pushed down, the clamp member 10 becomes in the clamped state, and the disk pad lever 13 is pushed down by the clamp member holding plate 9, and the upper head assembly 17 is released from the restrained state in which it is lifted upward. It is pushed down toward the lower head base 18 by the elastic force of the spring 21. Furthermore, if the operating lever 4 is rotated 90 degrees in the direction of arrow A from this state, the pressing force exerted on the pressing plate 8 by the pressing cam 7 is removed, and the clamp member holding plate 9 is moved by the force of the spring 11. The disk pad lever 13 also returns upward by the force of the spring 15 and lifts the upper head assembly 17, so that each of the above-mentioned members Returns to the state shown.

Here, as described above, the clamp shaft 1 cannot be rotated in the direction of arrow B when the magnetic disk is not inserted, and can only be rotated when the magnetic disk is inserted into the main body of the apparatus. This mechanism will now be explained with reference to FIGS. 2 to 5.

2 and 3 show a state in which the magnetic disk is not inserted. In this state, the surface 5a-1 of the locking portion 5a of the lock cam 5, which is pulled by the spring 6 as described above, is in a horizontal state, and comes into contact with the pin 1a of the clamp shaft 1, which is also in a horizontal state, so that the clamp shaft 1 is maintained unrotatable. Also, at this time, the plate-shaped actuating portion 5b that hangs down and protrudes from the lower part of the lock cam 5 is connected to the elongated groove 2 formed in the support plate 2.
a into the disk insertion hole 3 of the front plate 3.
Magnetic disks 22 (fourth and fifth
(see figure). In the figure, 5c is an L-shaped arm provided above the lock cam 5, 5d is a contact surface with the pin 1a in the vertical state, which will be described later, and the vertical groove 5e in FIG. , to allow the lock cam 5 to tilt with respect to the clamp shaft 1.

When the magnetic disk 22 is inserted from the state shown in FIGS. 2 and 3 above, the magnetic disk 22 is inserted as shown in FIG.
The operating portion 5b of the lock cam 5 located on the insertion path of the lock cam 5 is pushed by the magnetic disk 22, and as a result, the lock cam 5 is tilted in the direction of the arrow shown in the figure against the spring 6. Due to this tilting of the lock cam 5, the surface 5a-1 of the locking portion 5a is tilted from the horizontal state as shown in FIG. 4, and reaches a position that allows rotation of the pin 1a (rotation of the clamp shaft 1).

Therefore, if the clamp shaft 1 is rotated 90 degrees in the direction of the arrow B with the magnetic disk 22 completely inserted, the pin 1a will also rotate, and the pin 1a will have a surface 5a-1. The pushed lock cam 5 further tilts in the same direction as shown in FIG. It comes into contact with the contact surface 5 of. In this state, the L-shaped arm 5c prevents the lock cam 5 from moving by the pin 1a, thereby maintaining the lock function. In the state shown in FIG. 5, that is, in the driveable (or driveable) state of the device due to the rotation of the clamp shaft 1 described above, the operating portion 5b of the lock cam 5 is in a position completely separated from the magnetic disk 22. Further, the operation lever 4 is connected to the insertion hole 3.
It is in a state where a is blocked.

When the clamp shaft 1 is rotated 90 degrees in the direction of the arrow A from the state shown in FIG. 5, the lock cam 5 returns to the position shown in FIG. When the lock cam 5 is pulled out, the spring 6 returns the lock cam 5 to the initial state shown in FIGS.

(Effects of the invention) As detailed above, according to the invention, the clamp shaft cannot be rotated when the magnetic disk is not inserted, in other words, the clamping operation by the clamp member by rotating the clamp shaft, Since the lowering of the upper head assembly is prohibited, there is no risk of damaging important parts of the equipment due to incorrect or tampered operation. Further, when the magnetic disk is inserted and clamped, the lock cam that detects the insertion of the magnetic disk is completely separated from the magnetic disk, so that reliability during rotation of the magnetic disk is not impaired. In addition, the lock cam that controls the rotation of the clamp shaft also functions as a detection member for the magnetic disk, and the lock cam is held on the clamp shaft and works together with it, which reduces the number of parts. Moreover, it is possible to provide a malfunction prevention mechanism with a simple mechanism and a good space factor, and its practical value is great.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention; FIG. 1 is a simplified perspective view showing the entire mechanism, FIG. 2 is a perspective view showing the clamp shaft and lock cam, and FIGS.
FIG. 5 is an explanatory diagram of the operation. 1... Clamp shaft, 1a... Pin (protrusion), 4
. . . Operation lever, 5 .
...Abutting surface, 6...Spring, 7...Pushing cam, 8...
...Press down plate, 9...Clamp member holding plate, 10...
... Clamp member, 11 ... Spring, 12 ... Spindle, 13 ... Disk pad lever (upper head restraining member), 15 ... Spring, 16 ... Magnetic head carriage, 17 ... Upper head assembly,
18...lower head assembly, 21...spring,
22...Magnetic disk.

Claims (1)

[Scope of utility model registration request] a clamp shaft that can be manually operated from the front of the device body; a clamp member that presses the center of the magnetic disk against the spindle by rotation of the clamp shaft;
The upper head assembly is always elastically biased toward the lower head assembly, and when the clamp member is not clamped, the upper head assembly is restrained and held at a position a predetermined distance from the lower head assembly, and the clamp shaft is an upper head restraining member that releases the restraint state to press the upper head assembly via the magnetic disk in response to the rotation of the clamp shaft; a lock cam for controlling the rotation of the clamp shaft that is elastically biased in the direction of tilting of the clamp shaft; a protrusion on the clamp shaft that engages with the lock cam to prevent rotation of the clamp shaft when the magnetic disk is not inserted; and an actuating part of the lock cam that tilts the lock cam to a position where the lock cam comes into contact with the magnetic disk and allows rotation of the clamp shaft, and the rotation of the clamp shaft that becomes rotatable due to the tilting of the lock cam is provided. A double-sided floppy disk drive device, characterized in that the lock cam is further tilted to separate the operating portion of the lock cam from the magnetic disk.