JPS61244910A - Fastener - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fastener that is inserted into and attached to a small diameter portion of a shaft from a direction perpendicular to the axis of the shaft. For example, it is ideal for use as a stopper for pivoting an object to be attached to a shaft in various electronic devices.

[Summary of the invention]

The present invention provides a fastener that is inserted into and attached to a small diameter portion of a shaft in a direction perpendicular to the axis of the shaft, in which the fastener is inserted into the small diameter portion of the shaft in a first direction perpendicular to the small diameter portion of the shaft by means of a groove. After inserting the stopper from the direction, the stopper is moved in the second direction, which is the axial direction of the shaft, and the stopper is engaged with the outer peripheral surface of the large diameter portion provided on the shaft by the engaging portion. By locking the stopper to the shaft and preventing the stopper from falling off the shaft in the opposite direction to the first direction, the stopper can be attached to the shaft without the need for any tools. It can be easily locked and disengaged, and moreover, no force is applied to the shaft in a direction perpendicular to the axis when the stopper is engaged and disengaged.

[Conventional technology]

First, as a conventional example of this type of stopper, a stopper for swingably supporting an optical head about an axis in an optical disc player will be described with reference to FIGS. 12 and 13.

An optical head 4 is swingably supported on a shaft 2 horizontally fixed to a fixed part 1 via a polyslider 3 for reducing friction. A compression coil spring is attached to the outer periphery of the spacer 5 inserted from the tip 2a of the shaft 2, so that the optical head 4 is pressed and urged by the compression coil spring 6 and is crimped onto the fixing portion 1 side.

By the way, the E-ring 7 is inserted into the small diameter portion 8 provided on the tip end 2a side of the shaft 2 from a direction perpendicular to the axis of the shaft 2 (direction of arrow a), as shown by a dashed line to a solid line. installed.

[Problem that the invention seeks to solve]

However, since the above-mentioned stopper, that is, the E-ring 7, is engaged with the small-diameter portion 8 of the shaft 2 by the elasticity of the E-ring 70, the attachment of the By-ring 7 to the small-diameter portion 8 is When removing the E-ring 7, a working tool such as a radio bench is always required, and the work of installing or removing the E-ring 7 is extremely troublesome.

Furthermore, since the E-ring 7 is elastically engaged with the small-diameter portion 8 from the direction perpendicular to the axis of the shaft 2 (direction of arrow a), it is difficult to attach the E-IJ ring 7 to the small-diameter portion 8. Alternatively, during removal, a force is always applied to the shaft 2 in a direction perpendicular to the axis (direction of arrow a). In particular, when the small diameter portion 8 is located on the tip 2a side of the shaft 2 as shown in the figure, the above force tends to cause the shaft 2 to bend or fall as shown in the direction of the arrow. Particularly in the case of the shaft 2 for pivotally supporting the optical head 4, if the shaft 2 is bent or tilted, the precision of the pivoting of the optical head 4 will be significantly degraded.

Furthermore, if the E-ring 7 is repeatedly attached and detached, the small diameter portion 8 will wear out, and the EIJ ring 7 itself will undergo plastic deformation, and in some cases, parts may need to be replaced.

Therefore, the present invention is capable of extremely easily locking and disengaging the stopper from the shaft without requiring any working tools, and moreover, when the stopper is engaged and disengaged, the direction perpendicular to the axis IfC@line is The object is to provide a stop that does not apply any force at all.

[Means for solving problems]

In the above-described stopper, the present invention includes a rounded groove inserted into the small diameter portion of the shaft from the first direction, which is the perpendicular direction, and a rounded groove portion inserted into the small diameter portion of the shaft from the first direction, which is the perpendicular direction; The stopper is provided with an engaging part for engaging from a certain second direction, and after the stopper is inserted into the small diameter part of the shaft from the first direction through the groove part, the stopper stays on the axis line. moving in the second direction and engaging the engaging portion with the outer surface of the large diameter portion, thereby locking the stopper to the shaft, and moving the stopper from the shaft in a direction opposite to the first direction; It is designed to prevent it from falling off.

[Effect]

In the present invention, when the stopper is inserted into the small diameter portion of the shaft from the first direction, the groove portion is only inserted into the small diameter portion, so no load is applied to the stopper and the shaft during insertion. Also, when removing the stopper from the shaft, move the stopper in the opposite direction to the second direction to disengage the engaging part of the stopper from the large diameter part of the shaft, and then move the stopper in the first direction. does not place any load on its stop and shaft when removed in the opposite direction. Therefore, no power tools are required when attaching or removing the stopper to the shaft, and the shaft does not bend or fall when the stopper is attached or removed. There is no.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a stopper for swingably supporting an optical head about an axis in an optical disc player will be described with reference to FIGS. 1 to 11.

First, as shown in FIGS. 4 and 5, the optical head 10 is used for recording (writing) and/or reproduction (reading) by irradiating the lower surface of the disk 11, which is the recording surface, with a laser beam and receiving the reflected light. ) head 12 is provided. The optical head 10 is guided by a guide shaft 13 and is moved together with a moving block 14 that moves the disk 110 in the radial direction (direction of arrow G in FIG. 4) K: linearly.

That is, as shown in FIG. 5, a shaft 15 is horizontally fixed to the movable block 14 so as to be perpendicular to the moving direction thereof. An optical head 10 is inserted into this shaft 15 via a holder 16 by means of a pair of protrusions 17, and is pivotably supported therein. A compression coil spring 19 is inserted into the outer periphery of the spacer 18 inserted from the tip 15a of the shaft 15, and this compression coil spring 19 is connected to the stopper 20 according to the present invention.
It is prevented from coming off. Therefore, the optical head 10 is urged by the compression coil spring 19 and is pressed against the moving block 14 side.

The movable block 14 is moved in the direction of the arrow C by a rack 21 provided at a lower portion thereof being driven by a pinion 23 of a motor 22. Further, a roller 24 is rotatably provided on the tip 15a side of the shaft 15, and this roller 24 is guided by a guide rail 25.

What is shown in FIGS. 1A to 3B is the stopper 2.
The value is 0, which is the first embodiment of the present invention.

First, as shown in FIGS. 1A to 10, a large diameter portion 27 is provided on the tip 15a side of the shaft 15, and a small diameter portion 27 is provided continuously on the same axis as a part of this large diameter portion 27. A section 28 is provided. The stopper 20 is attached to the large diameter portion 27 and the small diameter portion 28.

That is, as shown in Figures G3A and G5B, the stopper 20 is formed of sheet metal or the like into a substantially circular shape, and a circular hole 30 is provided offset from the center thereof. A circular recess 61 that is partially continuous with the circular hole 30 is provided on one side 20a of the stopper 20. A substantially U-shaped groove 62 that is continuous with the circular hole 60 is provided within the circular recess 31 . Here, the diameter A of the circular hole 30 and the circular recess 31 is also slightly larger than the diameter B of the large diameter portion 27 of the shaft 15, and the width C of the groove portion 32 is formed slightly larger than the diameter of the small diameter portion 28 of the shaft 15. ing. Therefore, the groove portion 62 is the small diameter portion 28
The circular recess 31 is configured to be able to be inserted into the outer peripheral surface 27a of the large diameter portion 27. An engaging portion 66 is formed on the inner circumferential surface of the circular recess 61 that engages with the outer circumferential surface 27a of the large diameter portion 27.

The stopper 20 configured as described above is first inserted into the large diameter portion 27 by the circular hole 60 against the compression coil spring 19 along its axis in the direction of the arrow d, as shown from the dashed line to the solid line in FIG. 1A. and insert it.

Note that if the diameter B of the shaft 15 is made larger than the diameter A of the circular hole 60, it is convenient because the stopper 20 can be inserted in the direction of the arrow d until it comes into contact with the end of the shaft 15. .

Next, as shown in FIG. 1B, the stopper 20 is inserted into the groove 3.
2 to the small diameter portion 28 from the first direction (direction of arrow e) that is perpendicular to the axis.
the small diameter portion 28 until it comes into contact with the outer circumferential surface 28a of the small diameter portion 28.

Thereafter, as shown in FIG. 1C, when the stopper 20 is moved in the second axial direction (arrow f direction), the circular recess 31 is fitted into the large diameter portion 27, and the circular recess 61 is engaged. The mating portion 66 engages with the outer peripheral surface 27a of the large diameter portion 27. In reality, the stopper 20 is pressed by the spring force of the compression coil spring 19 and moves in the direction of the arrow f. Also here, the groove 62
If the bottom part 32a is formed coaxially with the circular concave part 31, when the stopper 20 is moved in the direction of the arrow f, the engaging part 63 will engage with the outer circumferential surface 27a of the large diameter part 27, which is convenient. .

The stop 20 is locked to the shaft 15 as described above. The engaging portion 36 of the stopper 20 is connected to the outer circumferential surface 27a of the large diameter portion 27.
By engaging with υ, this stopper 20 is prevented from falling off from the shaft 15 in the direction opposite to the first direction (in the direction of arrow e').

By the way, since the elasticity of the stopper 200 is not required at all when locking the stopper 20 to the shaft 15 as described above, no working tools such as radio pliers are required for its attachment.

The stopper 20 can also be easily removed by the above-mentioned reverse operation without any tools.

During this installation or removal, no force is applied to the shaft 15 in the direction perpendicular to the axis (in the directions of arrows e and e'), so this force causes the shaft 15 to move in the direction of the arrow g (the There is no worry that the song will fall or collapse as shown in Figure 1C).

Next, a swinging mechanism of the optical head 10, which is swingably attached to the shaft 15 using the above-described stopper 20, will be explained. That is, as shown in FIGS. 4 and 5, the moving block 1
A motor 35 and a worm wheel 37 which is rotationally driven by a worm 36 of the motor 35 are provided on one side of the motor 4, and a bin 68 is fixed to the worm wheel 37 offset from the center. On the other hand, a slope 39 is formed on one side of the optical head 10, and the bottle 38 is in contact with this slope 69. Note that the optical head 10
is biased to rotate in the direction of the arrow by a tension coil spring 40 stretched between the movable block 14 and the movable block 14.

If there is a skew in the disk 11, this is detected by a skew detection device 41 provided in the optical head 10, and the motor 3 is
5 is rotated. When the worm wheel 37 is set, the arrow i
The optical head 10 is rotated by the cooperative action of the tension coil spring 40 and the pin 38 which is rotated in the direction and comes into contact with the slope 39.
is swung about the shaft 15 in the arrow direction or h' direction. As a result, the optical axis of the laser beam emitted by the recording and/or reproducing head 12 is always tilted perpendicular to the recording surface of the tilted disk 11, thereby performing skew correction. Note that the bin 38 is driven to rotate approximately 16° to 188 degrees, thereby tilting the optical head 10 approximately ±3°.

Next, FIGS. 6 to 8 show a second embodiment of the stopper. That is, in the first embodiment described above, the stopper 20 was once inserted from the large diameter part 27 through the circular hole 30, but in the second embodiment, the stopper 43 is inserted directly into the small diameter part 27.
8.

The stopper 43 is formed of sheet metal or the like into a substantially circular shape, and has a groove 44 cut into a substantially U-shape from its outer periphery for insertion into the small diameter portion 28. A circular recess 45 is provided on one side 43a of the stopper 46, and an engaging portion 46 is formed on the inner peripheral surface of the circular recess 45.

According to this second embodiment, the stopper 46 can be directly inserted into the small diameter portion 28 from the first direction (direction of arrow e) through the groove 44, so another component can be attached to the tip 15a side of the shaft 15. Even if there is, there is no need to remove it, which is convenient.

Next, FIGS. 9 to 11 show a third embodiment of the stopper. That is, in the first and second embodiments described above, the stop A2
By engaging the engaging portions 33, 46 formed on the inner circumferential surface of the circular recess 61.45 with a diameter of 0.43 mm to the outer circumferential surface 27a of the large diameter portion 27, the stopper 20.43 is moved in the first direction. is designed to prevent it from falling off in the opposite direction,
Actually, it is sufficient if the engaging portion is provided on the front end side in the first direction.

Therefore, the stopper 48 of the sixth embodiment is formed of a sheet metal or the like into a substantially U-shape, and the inner periphery of the stopper 48 is a groove 49. Then, both ends of the stopper 48 are bent approximately at right angles toward one side 48a to form an engaging portion 50.

According to this third embodiment, after the stopper 48 is inserted into the groove 49 from the first direction (arrow e direction), the stopper 48 is inserted from the second direction (arrow e direction).
When moving in the direction of arrow f), the engaging portion 50 engages with the outer circumferential surface 27a of the large diameter portion 27.

This engaging portion 50 prevents the stopper 48 from falling off in the direction opposite to the first direction (in the direction of arrow e').

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the stopper is moved in the axial direction by a compression coil spring using a horizontal shaft to engage the large diameter portion, but the compression coil spring is moved at the lower end of the vertical shaft. It is also possible to engage the large diameter portion without using it. Further, the small diameter portion may have the same diameter as the shaft portion of the shaft.

Note that the present invention is not limited to a stop for pivoting an optical block around an axis in an optical disk player, but is also applicable to a stop for pivoting an attached object to various axes in various types of equipment. Applicable to tools.

〔Effect of the invention〕

As described above, in the present invention, the stopper is inserted into the small diameter portion of the shaft through the groove without applying any force in a direction perpendicular to the axis, and then the stopper is moved in the axial direction of the shaft to remove the stopper. This is a fastener that can prevent the fastener from falling off in the opposite direction to the direction of insertion into the shaft by engaging the engaging portion of the fastener with the large diameter portion of the shaft.

Therefore, unlike conventional E-rings that are elastically locked onto the small diameter part of the shaft, no work tools such as radio pliers are required to attach or remove the stopper from the shaft. This installation or removal operation can be performed very easily.

Further, when the stopper is attached to or removed from the shaft, no force is applied to the shaft in a direction perpendicular to the axis, so there is no fear that the shaft will bend or fall. Particularly in the case of a shaft for pivotally supporting an optical head with extremely high precision as in this embodiment, since there is no bending or tilting of the shaft, accuracy can be maintained reliably and reliability can be achieved. Very sensitive.

Furthermore, even if the stopper is repeatedly attached and removed from the shaft, the small diameter part of the shaft will not wear out, and the stopper itself will not undergo plastic deformation, so there is no need to replace parts. It is very durable.

[Brief explanation of the drawing]

1 to 11 show an embodiment in which the present invention is applied to a stopper for swingably supporting an optical head about an axis in an optical disk player, and FIGS. 1A to 1C
The figures are cross-sectional views of main parts in the first embodiment, and Figures 2A to 2
Figure 0 is the IA-IA line in Figure 1A and I in Figure 1B, respectively.
B-IB line and no-mC line sectional view of Figure 1C, 3A
Figures 6 and 6B are perspective views of the stopper, Figure 4 is a front view of the optical head portion, Figure 5 is a side view of the optical head portion, and Figure 6 is a side view of the optical head portion.
The figure is a perspective view of the stopper in the second embodiment, FIG. 7 is a sectional view of the main part, FIG. 8 is a sectional view taken along the line ■-■ in FIG. A perspective view, FIG. 10 is a sectional view of a main part, and FIG. 11 is a sectional view taken along the line xt-xt in FIG. 10. Furthermore, FIGS. 12 and 16 show how a conventional stopper is used when the optical head is swingably supported on an axis in an optical disc player, and FIG. 12 is a sectional view of the main part. , FIG. 13 is an enlarged sectional view taken along the line ■-■ in FIG. 12. In addition, in the symbols used in the drawings, 15......Axle 20.48...
...Stopper 27......Large diameter portion 27a...
.........Outer peripheral surface 28...
......Small diameter portion 32, 44.49...Groove portion 3 46.50...Engaging portion.

Claims (1)

[Scope of Claims] A fastener that is installed by being inserted into a small diameter portion provided on a shaft from a direction perpendicular to the axis of the shaft, wherein the fastener is inserted into the small diameter portion from a first direction that is perpendicular to the axis of the shaft. a groove portion and an engaging portion for engaging the outer circumferential surface of the large diameter portion provided on the shaft from a second direction that is the axial direction; After the insertion from the direction, the engaging portion is moved in the second direction along the axis to engage the outer circumferential surface of the large diameter portion, thereby locking the engaging portion to the shaft and moving the engaging portion from the shaft to the first direction. A stopper characterized by being configured to prevent it from falling off in the opposite direction.