JPH0521719Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a double-sided head support mechanism for a floppy disk drive, in particular, the upper and lower arms supporting the upper and lower heads are integrally supported by arm springs on a carriage so as to be swingable. This invention relates to an improvement of the double-sided head support mechanism that has been developed.

[Prior Art] In recent years, floppy disk drives used as external storage devices for computers and the like read/write on both sides of the floppy disk, so it is common to have upper and lower heads that are in close contact with both sides of the floppy disk. It is becoming.

This type of double-sided head support mechanism is designed so that the upper and lower heads can follow the vertical movement of the floppy disk to perform high-quality reading/writing operations, and that no off-track occurs when the upper and lower heads move. It has been proposed that upper and lower arms, each carrying a head, are integrally supported by an arm spring against a carriage.

According to such a device, the upper and lower arms can be rotated integrally with respect to the carriage by the arm spring, and the upper and lower heads can follow the movement of the floppy disk without causing off-track.

[Problems to be solved by the invention] However, according to the arm body in which the upper and lower arms are integrated, when the upper arm is opened to attach or remove the floppy disk, the lower arm is also displaced in accordance with the opening of the upper arm. In order to prevent such rotation, it is necessary to provide a stopper on the arm body. Conventionally, such a stopper was obtained by engaging a stopper pin provided on the head side of the lower arm with a groove provided in the carriage. It was getting worse.

Therefore, in such a conventional device, since the stopper pin and the like are provided at the tip of the lower arm where there is not enough space, the structure is complicated and the device has the drawback of being a major impediment to weight reduction.

The present invention has been devised in view of the above-mentioned conventional problems, and its object is to provide an improved double-sided head support mechanism that can extremely easily achieve a stopper structure for the lower arm.

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that a stopper is provided at the carriage position corresponding to the tail end of the arm body.

Therefore, according to the present invention, it is possible to provide a small and lightweight head support mechanism by effectively using the tail end of the arm body.

[Embodiments] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment of the head support mechanism according to the present invention in a perspective view, and FIG. 2 shows the assembled state in a partially cutaway manner.

In the figure, a carriage 10 is slidably supported by a guide rail on a frame (not shown), and upper and lower magnetic heads, which will be described later, can be moved to arbitrary positions (tracks) along the radial direction of the floppy disk. .

In the figure, a guide hole 10 of a carriage 10 is shown.
a and 10b form sliding parts with the aforementioned guide rail.

Further, an arm 10c extending to the side of the carriage 10 represents a coupling portion with a stepping motor for driving the carriage 10, and in the embodiment, a coupling hole 10d provided in the arm 10c is used.
The carriage 10 and the stepping motor can be coupled to each other by fixing the tip of the linear screw shaft of the stepping motor to.

In the illustrated embodiment, the upper and lower magnetic heads are fixed to an upper arm and a lower arm, respectively, and both arms form an arm body, which is fixed to the carriage 10 by an arm spring, so that both heads are It can freely move vertically with respect to the carriage 10, and as a result, both magnetic heads can reliably follow the vertical movement of the floppy disk.

The arm body is indicated by reference numeral 12 in the drawings and includes an arm base 14 , an upper arm 16 and a lower arm 18 .

The arm base plate 14 is made of a plastic molded product, and an arm spring 20 is insert-molded on one side of the arm base plate 14. One end of the arm spring 20 is attached to the two of the above-mentioned carriages 10 by means of screws 24 and 26 via a presser plate 22. arm support pillars 10e, 10
It is firmly fixed at f.

Further, the tail end of the arm board 14 is connected to the both arms 1.
It has a counterbalance part 14a extending in the opposite direction to the direction in which arms 6 and 18 extend, and in the assembled state, the weight of the arm body 12 is balanced on the head side and the opposite side with respect to the intersection of the arm springs 20. This significantly improves the earthquake resistance and posture difference of the device.

A weight 28 can be attached to the counterbalance part 14 as necessary, and the overall balance of the arm body 12 with respect to the intersection can be arbitrarily adjusted.

In the embodiment, this weight 28 has a disk shape and is attached to the counterbalance portion 1 of the arm substrate 14.
It can be fixed to 4a by adhesive or press-fit.
The weight 28 is preferably made of a material with a high specific gravity, and brass is usually used, but it is also useful to use tungsten with a high specific gravity, if necessary.

As described above, the arm substrate 14 is connected to the arm spring 2.
As a result, both arms 16 and 18 fixed to the arm base plate 14 can also freely follow the vertical movement of the floppy disk.

An upper arm 16 is fixed to the upper surface of the arm substrate 14, and in the present invention, the upper arm 16 has a hybrid construction of a head holder portion 30 made of plastic and an arm rod portion 32 made of metal. The arm rod portion 32 has a size that occupies most of the total length of the upper arm 16, so that the arm rod portion 32 can determine expansion and contraction due to thermal expansion from the fulcrum of the upper arm 16 to the head. By matching the material of the arm 18 to the material of the arm rod 32, it is possible to reduce positional deviations due to thermal expansion in the upper and lower heads.

The head holder portion 30 supports an upper head 36 via a cymbal spring 34 at its tip. Further, the arm rod portion 32 is made of a thin stainless steel plate spring in the embodiment, and when the upper arm 16 freely swings relative to the arm base plate 14, the flexibility of the arm rod portion 32 prevents the head position from shifting. In order to prevent this, the tips of the pair of lever parts 38 extending from the head holder part 30 toward the arm board 14 come into contact with the upper surface of the arm board 14, so that the upper head 36 is always correctly positioned with respect to the arm board 14. can do.

One end of the arm rod portion 32 is insert-molded into the head holder portion 30, and the other end is firmly fixed to the arm base plate 14 by an upper holding plate 40 using screws 42 and 44.

On the other hand, the lower arm 18 is made of a metal arm,
Although aluminum is used in the examples,
It is also possible to form it from other materials such as stainless steel.

A lower head 46 is fixed to the lower arm 18 at its distal end, and the other end is secured to the screw 50 by a lower holding plate 48.
52 to the lower surface of the arm substrate 14.

Therefore, the lower arm 18 is integrally fixed to the arm substrate 14, while the upper arm 16 is fixed to the arm substrate 1.
It is understood that the arm 32 is swingably held with respect to the arm 4.

In order to apply a desired loading pressure between the arms 16 and 18, a loading spring 56 is inserted into the spring bearing shaft 54 of the arm base plate 14, and its tip is pressed against the upper arm 16 in a predetermined biased state. It is engaged with a spring receiver 30a provided on the head holder portion 30.

Therefore, as is clear from the assembled state shown in FIG.
6 and 46 are applied with the desired pressure to bring them into proper contact with each side of the floppy disk.

The characteristic feature of this embodiment is that the lower arm 18 is formed by drawing a thin metal plate, and as shown in the figure, its entire outer periphery is drawn into a box shape, resulting in a light weight. Even though it is a thin metal plate, sufficient rigidity without bending or deflection can be obtained, and the positional accuracy of the lower head 46 can be significantly improved.

As is clear from the assembled state shown in FIG. 2, in this embodiment, the upper arm 16 and the lower arm 18 are supported by the arm board 14.
4 is swingably supported on the carriage 10 by an arm spring 20, both heads 36, 46 can move freely following the vertical movement of the floppy disk, and even during such movement, both heads 36 , 46 move integrally, there is almost no room for off-track, etc., and highly accurate read/write operations can be performed while allowing movement of the head.

However, in such a movable vertical head, it is necessary on the one hand to determine the initial position of the head, and in the embodiment, this initial position is determined by vertically moving the adjusting tongue 20a formed integrally with the arm spring 20. Let me do it.

The adjustment screw 60 that engages with the adjustment tongue piece 20a is screwed to the presser plate 22 in the embodiment, and its tip engages with the forked tip of the adjustment tongue piece 20a to rotate the adjustment screw 60. This applies a desired bias load to the arm spring 20 and correctly determines the initial position of both heads 36,46.

A characteristic feature of the present invention is that the tail end of the arm body 12, in the embodiment, the arm substrate 14
A stopper 10g is provided at a position on the carriage 10 corresponding to the tail end of the arm base plate 14, that is, the lower arm 18, whose tail end comes into contact with the stopper 10g to prevent further movement. There is.

In the embodiment, the stopper 10g is formed integrally with the carriage 10.

Therefore, according to the present invention, even when the upper arm 30 is opened upward against the biasing force of the loading spring 56 during attachment and detachment of the floppy disk, the lower arm 18 has the tail end of the arm base plate 14 pressed against the stopper. 1
0g and is prevented from further displacement, making it possible to hold the lower arm 18 in a predetermined position, and positioning the arm body or the lower arm with a simple structure.

[Effects of the invention] As explained above, according to the invention, the lower arm side of the upper and lower arms rotatably provided on the arm spring can be moved by effectively using the carriage position facing the tail end of the arm body. When the upper arm is opened, it can be reliably positioned at a desired position, and in particular, since the head side portion of the lower arm is not used as a stopper, it is possible to obtain an arm body that is simple in structure and lightweight.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of the head support mechanism according to the present invention, and FIG. 2 is a sectional view of a main part showing the assembled state of FIG. 1. 10...carriage, 10g...stopper, 1
2...Arm body, 14...Arm board, 16...
Upper arm, 18... lower arm, 20... arm spring, 30... head holder section, 32... arm rod section.

Claims (1)

[Scope of utility model registration request] An upper arm and a lower arm each carrying upper and lower heads that sandwich the magnetic disk at opposing positions from both sides are rotatably supported by each other at one end, and the arm body is capable of reciprocating along the radial direction of the magnetic disk. a carriage, and an arm spring that supports the arm body on the carriage so as to be able to swing as a whole, and a stopper is provided on the carriage at a position facing the tail end of the arm body on the opposite side from the head, and a floppy disk is attached. A double-sided head support mechanism for a floppy disk drive characterized by holding the lower arm in a predetermined position when the upper arm is opened.