JPH0348770Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk device generally called a floppy disk drive device, and more specifically, the present invention relates to a magnetic disk device that is generally called a floppy disk drive device, and more specifically, a magnetic disk device that uses both main surfaces of a flexible magnetic disk. The present invention relates to a magnetic head support mechanism for recording or reproducing signals.

[Conventional technology]

In a double-sided magnetic disk device, one magnetic head is attached to a carriage, the other magnetic head is attached to an arm, the arm is rotatably attached to the carriage with a hinge leaf spring, and the other magnetic head is attached to the disk. A configuration in which a biasing force in the direction of contact is applied to the arm by a torsion spring is known.

[Problem that the invention attempts to solve]

In the above device, in order to stably obtain contact pressure of the other magnetic head against the disk by the torsion spring, one end of the torsion spring is arranged so as to press a position on the arm as close to the other magnetic head as possible. It is desirable to do so. However, the shaft that supports the torsion spring is necessarily near the hinge plate spring that supports the arm, so if you try to press near the other magnetic head, it is necessary to increase the length of one end of the torsion spring. This causes one end of the torsion spring to easily deform. As a result, the required biasing force may not be obtained, or one end of the torsion spring may come into contact with the lead wire led out from the magnetic head.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic disk device that can obtain a stable biasing force even if one end of the torsion spring is relatively short.

[Means for solving problems]

To achieve the above-mentioned objects, the present invention is a device that converts signals using both main surfaces of a flexible magnetic disk, and includes a rotating mechanism for the disk and a rotating mechanism for one main surface of the disk. first contact
a magnetic head; a carriage supporting the first magnetic head; a second magnetic head disposed opposite to the first magnetic head and in contact with the other main surface of the disk; a first arm supporting the head; and a hinge leaf spring having one end fixed to the first arm and the other end fixed to the carriage for rotatably supporting the first arm. , a central portion that extends parallel to the first arm and covers at least a portion of the first arm, a tip portion that presses the first arm, and is rotatably supported by the carriage. a second arm having a support portion and having rigidity; a shaft supported by the carriage and disposed near a portion of the leaf spring fixed to the carriage; and a second arm wound around the shaft; Said first
and one end extending in the same direction as the second arm, and presses the central portion of the second arm at or near the tip of the one end, so that the second magnetic head contacts the disk. A magnetic disk device comprising: a torsion spring that applies a directional biasing force to the first arm via the second arm; and a mechanism for moving the carriage in the radial direction of the disk. It is related to.

[Effect]

In the device of the above invention, when the second arm is pressed by a torsion spring, the first arm is pressed via the second arm. Since the second arm has high rigidity, it does not substantially bend even if its tip extends along the first arm to the vicinity of the second magnetic head. Therefore, the force of the torsion spring is stably transmitted to the first arm. Further, since the second arm is rotatably supported, the force of the torsion spring can be transmitted to the first arm with little loss. In the end, there is no problem even if the length of one end of the torsion spring is shortened, and the problem of bending of the one end of the torsion spring is reduced. As a result, sufficient biasing force can be stably obtained.

〔Example〕

Next, a magnetic disk device for recording or reproducing data using a flexible magnetic disk cartridge (floppy disk) according to an embodiment of the present invention shown in FIGS. 1 to 5 will be described.

In this magnetic disk device, a flexible magnetic disk 1 is rotated by a rotating mechanism 2, a first magnetic head 3 is brought into sliding contact with the lower surface of the disk 1, and a second magnetic head 4 is brought into sliding contact with the upper surface of the disk 1. The device is configured to record or play back signals. The first magnetic head 3 is connected to the carriage 6 via the gimbal spring plate 5.
is installed on. The second magnetic head 4 is connected to a first arm 8 made of synthetic resin via a gimbal spring plate 7.
It is attached near the tip of the The first and second magnetic heads 3 and 4 have mirror-finished gap surfaces.

As is clear from FIG. 4, one end of a leaf spring 9 for obtaining a hinge function is fixed to the first arm 8, and the other end of this leaf spring 9 is fixed to the protrusion 6a of the carriage 6 with a screw 10. Therefore, the first arm 8 can rotate or swing freely using the leaf spring 9 as a hinge. In this embodiment, the carriage 6 and the first arm 8 are made of polyphenylene sulfide (PPS) resin, which has high hardness and low elongation.

A second arm 11 is made of stainless steel and has great rigidity. This second arm 11 has a central portion 12 arranged parallel to the first arm 8, a tip portion 13 for pressing the first arm 8, and a pair of end portions for rotatably supporting the first arm 8. It consists of supporting parts 14 and 15. A pair of holes 16 and 17 are provided in a pair of support portions 14 and 15 that are perpendicular to the central portion 12;
A pair of shafts 18 and 19 provided on the protrusion 6a of the carriage 6 are inserted here. Since this second arm 11 is interposed between the torsion spring 20 and the first arm 8, the torsion spring 20
Recess 2 for stably receiving one end 21
2 in its central portion 12. Since the second arm 11 is less elastically deformable than the torsion spring 20, it does not substantially deform even when pressed by the torsion spring 20, and only the bent portion 23 of the tip portion 13 presses the first arm 8. Therefore, the first arm 8 is positioned closer to the second magnetic head 4 than the point where the one end 21 of the torsion spring 20 presses the second arm 11.
can be pressed. As a result, torsion spring 2
The same effect can be obtained by lengthening one end 21 of 0. In other words, even with a short torsion spring 20, it is possible to press a point close to the magnetic head 4, and the stability of the contact between the magnetic head 4 and the disk 1 is improved.

The coil portion 24 of the torsion spring 20 is connected to the carriage 6.
It is wound around a shaft 26 provided on a metal fitting 25 which is fixed with a screw 10, and the other end 27 is locked to the metal fitting 25.

A magnetic shield plate 28 is placed over the tip of the first arm 8 so as to cover the second magnetic head 4. The tip portion of the first arm 8 having this shield plate 28 is designed to reduce the thickness of the device.
It becomes thinner as it goes forward.

The carriage 6 is provided with a hole 30 through which a guide rod 29 for guiding the carriage 6 in the radial direction of the disk 1 is inserted. The carriage 6 is moved in the radial direction of the disk 1 by a moving mechanism consisting of a stepping motor 31 and a lead screw 31a.

When inserting the disk 1, the first arm 8 must be moved to the position shown by the chain line in FIG. For this reason, as shown in FIGS. 2 and 5, a protrusion 32 is provided on the first arm 8. When the disk 1 is not inserted, a head displacement mechanism (not shown) engages the protrusion 32 and lifts the protrusion 32, thereby releasing the torsion spring 20.
The first arm 8 is held in the position indicated by the dotted line in FIG. 1 against the leaf spring 9. When the disk 1 is inserted, the restriction by the protrusion 32 is released and the first arm 8 is in the head load position shown in FIG.

At the center of the first arm 8, a recess 33 is provided for passing the lead wire of the second magnetic head 4, as shown in FIG. As shown by the chain line in FIG. 2, a lead wire 34 led out from the first arm 8
is guided through a notch 35 provided in the second arm 11 to a lead wire holding recess 36 of the metal fitting 25. Since the magnetic head 4 includes an erasing head as well as a signal conversion head, the lead wires 34 usually consist of four. As in this embodiment, when the second arm 11 is provided to cover the first arm 8, the second arm 11 functions as a cover for the lead wire 34,
It is possible to prevent the torsion spring 20 from coming into contact with the lead wire 34. If the torsion spring 20 comes into contact with the lead wire 34, the lead wire 34 may be damaged or
There is a possibility that an appropriate biasing force by the torsion spring 20 may not be obtained.

The present invention is not limited to the embodiments described above, but may be modified. For example, the carriage 6 may be configured to be driven by a belt. It is also applicable to a case where one or both of the spring plates 5, 7 supporting the first and second magnetic heads 3, 4 have a non-gimbal configuration. It is also applicable to cases where one or both of the first and second magnetic heads 3, 4 are fixedly mounted.

[Effect of idea]

As is clear from the above, by providing the second arm according to the present invention, the lead wire of the second magnetic head is protected and the point of action of the torsion spring 20 is directed toward the second magnetic head. will be moved to

[Brief explanation of the drawing]

FIG. 1 is a front view showing a part of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a plan view of a part of the magnetic disk device shown in FIG. 1, and FIG.
4 is a perspective view of the magnetic head portion of FIG. 1, and FIG. 5 is an exploded perspective view of FIG. 1. 1... Disk, 2... Rotating mechanism, 3... First
magnetic head, 4... second magnetic head, 6...
Carriage, 8...first arm, 9...plate spring, 11...second arm, 12...center portion,
13... Tip portion, 14, 15... Support portion, 2
0...Torsion spring, 21...One end.

Claims (1)

[Claims for Utility Model Registration] A device for converting signals using both main surfaces of a flexible magnetic disk, comprising: a rotating mechanism for the disk; and a first magnetic disk that contacts one of the main surfaces of the disk. a magnetic head; a carriage supporting the first magnetic head; a second magnetic head disposed opposite to the first magnetic head and in contact with the other main surface of the disk; and the second magnetic head. a first arm for supporting the first arm; a hinge plate spring having one end fixed to the first arm and the other end fixed to the carriage in order to rotatably support the first arm; a central portion extending parallel to the first arm and covering at least a portion of the first arm; a tip portion for pressing the first arm; and a support rotatably supported by the carriage. a second arm having rigidity; a shaft supported by the carriage and disposed near a portion of the leaf spring fixed to the carriage; a second arm wound around the shaft; The second magnetic head has one end extending in the same direction as the first and second arms, and presses the central portion of the second arm at or near the tip of the one end, so that the second magnetic head a torsion spring that applies a biasing force in the direction of contact to the first arm via the second arm; and a mechanism for moving the carriage in the radial direction of the disk. magnetic disk device.