JPH0527181B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is applicable to cases where it is necessary to fasten an upwardly facing assembly to a downwardly facing assembly without misalignment, such as a double-sided head for a flexible disk drive. The present invention relates to a screw fastening structure suitable for.

[Background of the invention]

Such as a double-sided head for a flexible disk drive, it is necessary to assemble the bottom assembly and the top assembly without misalignment. If the positional deviation occurs, the magnetic head provided in the head assembly may be out of track, resulting in a drawback that accurate recording and reproduction cannot be performed.

The movable base, or head arm, shown in Japanese Patent Publication No. 58-43826 is fastened to a fixed base, or carriage, by screws, but when fastened, the position tends to shift due to the rotational torque of the screws.
There is a risk that track misalignment may occur between the magnetic heads.

In conventional technology, in order to prevent this misalignment, a means is used to adjust the position by anticipating the amount of misalignment when tightening the screw, or a metal plate or the like is interposed between the screw head and the upward assembly. Means for preventing the upward assembly from moving in the plane direction has been adopted, but the former has the disadvantage of requiring hot kneading, and the latter has the disadvantage of not being able to completely prevent displacement.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned drawbacks, etc., and its purpose is to reliably prevent positional displacement by a simple means, and to enable fastening work to be performed without requiring skill, thereby increasing work efficiency and yield, and improving reliability. The purpose of this invention is to provide a screw fastening structure that achieves the desired results.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention includes a downwardly mounted assembly having a groove having a flat bottom and a threaded hole in the bottom of the groove to be screwed with a head screw; an upwardly pointing assembly having a through hole into which a head screw is loosely inserted, a flat portion that is loosely inserted into the groove of the downwardly pointing assembly and making surface contact with a bottom surface of the groove; has a through hole into which a screw is loosely inserted, and is disposed within a groove of the lower assembly to cover the upper assembly;
The central part is pressed by the head screw, and the end part is restrained by the side wall of the groove, and the central part is bent upward with the central part being the lowest point. A thin plate piece wider than the width of the concave groove that is pressed into contact with the groove, and a screw fastening structure formed to fasten the head assembly and the upwardly mounted screw through the thin plate piece. That is.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

First, an outline of this embodiment will be explained.

As shown in FIG.
a is formed. The flat plate portion 2a of the upward assembly 2 is loosely inserted into the groove 1a and is disposed in surface contact. Further, a thin plate piece 3 having a width slightly wider than this groove width is inserted into the concave groove 1a, and the head screw 4 is inserted into the thin plate piece 3.
Connect the upper door assembly 2 to the lower door assembly 1 through the . The frictional resistance between the thin plate piece 3 and the groove 1a prevents displacement during screw fastening.

Next, this embodiment will be explained in more detail.

As shown in FIG. 1, the double-sided flexible disk drive device is composed of a lower assembly 1 and an upper assembly 2 screwed thereto, both of which are provided with a magnetic head (not shown). Performs recording and playback on a disk (not shown).

The upper assembly 2 has a flat plate part 2 for fastening it to the lower assembly 1.
a is formed. On the other hand, go down to the assembly 1
A recessed groove 1a into which the flat plate portion 2a can be loosely inserted is formed in the recessed groove 1a, and the flat plate portion 2a engages in surface contact with the center of the flat portion of the bottom surface of the recessed groove 1a. As shown in Fig. 2, the flat plate part 2a and the groove 1a have holes 2b for screw fastening.
and screw holes 1b are formed, respectively.

As shown in FIGS. 1 and 2, the thin plate piece 3 is formed from a thin flat plate with a width slightly wider than the groove width of the groove 1a, and is located inside the groove 1a at a position covering the hole 2b of the flat plate portion 2a. be inserted into the

Further, a hole 3a is formed through the thin plate piece 3 into which the threaded portion 5 of the headed screw 4 can be loosely inserted.

The headed screw 4 comes into contact with the thin plate piece 3 and functions to fasten the flat plate portion 2a into the groove 1a via the thin plate piece 3.

Next, the operation of this embodiment will be explained.

As shown in FIG. 2, the thin plate piece 3 is inserted into the groove 1a, and the threaded portion 5 of the headed screw 4 passes through the holes 3a, 2b and is screwed into the screw hole 1b of the groove 1a. As mentioned above, since the thin plate piece 3 is formed wider than the groove 1a, when it is inserted into the groove 1a and lightly tightened with screws, its both ends are pressed into contact with the groove 1a. Deforms into a concave shape. In this state, as shown in FIG. 2, a gap 6 is formed between the flat plate part 2a and the thin plate piece 3, and the flat plate part 2a is not fastened. In this state, or by lightly tightening the head bolt 4, the thin plate piece 3 is fixed to the flat plate part 2a.
Adjust the relative position of the upward assembly 2 with respect to the downward assembly 1 in the X, Y, and θ directions while lightly touching the assembly. At this time, position adjustment is possible because the width of the flat plate portion 2a is smaller than the groove width of the groove 1a.

Next, as shown in FIG. 3, when the headed screw 4 is further tightened, the headed screw 4 moves downward in the figure, but since the thin plate piece 3 is in pressure contact with the groove 1a at both ends as described above. Frictional force acts, and only the center side of the thin plate piece 3 is further bent. Therefore, the movement of the thin plate piece 3 is restrained, and the head screw 4 is tightened with its head always in contact with the thin plate piece 3. Act as a job. That is, the rotational torque when tightening the screw is blocked by the thin plate piece 3, and no rotational torque acts on the flat plate portion 2a. FIG. 3 shows a fastened state in which the gap 6 has become zero, and the flat plate portion 2a is fastened to a predetermined position in the groove 1a without moving.

As described above, by simply tightening the screws through the wide thin plate piece 3, the screws can be tightened quickly and reliably without requiring any special skill, and the positional deviation as described above does not occur. This improves work efficiency and yield.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by using simple means, it is possible to reliably prevent positional deviation and improve work efficiency and reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line -- in FIG. 1, and FIG. be. 1... Bottom assembly, 1a... Concave groove,
2...Upward assembly, 2a...flat plate part,
3...Thin plate piece, 4...Headed screw.

Claims (1)

[Claims] 1. A downwardly mounted assembly having a concave groove with a flat bottom surface, and a screw hole in the bottom surface of the concave groove to be screwed with a headed screw, and a through hole into which the headed screw is loosely inserted. an upper door assembly that is loosely inserted into the groove of the lower door assembly and has a flat portion that makes surface contact with the bottom surface of the groove; and a through hole into which the head screw is loosely inserted. and is disposed in a groove of the lower assembly to cover the upper assembly, a central portion thereof is pressed by the headed screw, and an end portion is restrained by a side wall of the groove; a thin plate piece wider than the width of the concave groove whose central portion presses against the upwardly extending assembly in a concavely bent state with the lowest point at the lowermost point; A screw fastening structure characterized in that the screw fastening structure is formed to be fastened to the top assembly using the headed screw.