JPH0765607B2 - Mounting structure of stopper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mounting structure of a stopper that can be freely attached to and detached from a shaft, and is applied, for example, when various objects are pivotally supported by an attached object on the shaft. And is the best one.

[Outline of Invention]

According to the present invention, in a mounting structure for a stopper that can be freely attached to and detached from a shaft, the shaft has a small diameter portion that is interposed in a part in the axial direction, and the stopper is substantially perpendicular to the axial direction. A recess into which the small-diameter portion is fitted when it is moved to, and a protrusion that is narrower than the diameter of the shaft so as to come into contact with the outer circumference of the shaft when the small-diameter portion is fitted and is moved in the axial direction. A pair of protrusions formed on the shaft, the pair of protrusions being disposed on the open end side of the recess, and the escape of the small-diameter portion from the recess to the shaft of the pair of protrusions. Since the mounting structure is configured so as to be blocked by the contact with the outer periphery, the stopper can be very easily locked and disengaged from the shaft without using any work tool, and the stopper can also be used. No force was applied to the shaft in the direction perpendicular to the axis when locking and releasing Than it is.

[Conventional technology]

First, as a conventional example of this type of stopper, a stopper for pivotally supporting an optical head on 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 fixed horizontally to a fixed portion 1 via a polyslider 3 for reducing friction. The spacer 5 inserted from the tip 2a of the shaft 2
A compression coil spring 6 is inserted into the outer periphery of the compression coil spring 6, and the compression coil spring 6 is prevented from coming off by a stopper, that is, an E ring 7. Therefore, the optical head 4 has a compression coil spring 6
Is pressed and urged by and is pressed against the fixed portion 1 side.

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

[Problems to be solved by the invention]

However, the stop as described above, namely the E-ring 7
Is to be engaged with the small diameter portion 8 of the shaft 2 by the elasticity of the E ring 7, so that the E ring 7 to the small diameter portion 8 is engaged.
A work tool such as a pair of pliers is always required when attaching or detaching, and the work for attaching or detaching the E-ring 7 is extremely troublesome.

Further, since the E ring 7 is elastically engaged with the small diameter portion 8 from a direction (direction of arrow a) perpendicular to the axis of the shaft 2, the E ring 7 is attached to the small diameter portion 8. When attaching or detaching, a force is always applied to the shaft 2 in the direction perpendicular to the axis (direction of arrow a). Especially when the small diameter portion 8 is on the tip 2a side of the shaft 2 as shown in the drawing, the shaft 2 is likely to be bent or collapsed by the force as shown in the direction of the arrow b. Particularly in the shaft 2 for pivotally supporting the optical head 4, if the shaft 2 is bent or tilted, the accuracy of pivoting the optical head 4 is significantly deteriorated.

Further, when the E ring 7 is repeatedly attached and detached, the small diameter portion 8 is worn and the E ring 7 itself is plastically deformed. In some cases, it is necessary to replace the parts.

Therefore, the present invention allows the stopper to be locked and disengaged from the shaft very easily without using any work tool, and further, when the stopper is locked and disengaged, a force in a direction perpendicular to the axis of the shaft is applied to the shaft. It is an attempt to provide a stopper that does not give any.

[Means for solving problems]

According to the present invention, in the above-described attachment structure for a stopper, the shaft has a small diameter portion interposed in a part in the axial direction, and the stopper is moved substantially perpendicularly to the axial direction. A concave portion into which the small diameter portion is fitted, and a pair of protrusions that are provided at a narrower interval than the diameter of the shaft so as to come into contact with the outer circumference of the shaft when the small diameter portion is moved in the axial direction after being fitted. A protrusion, and the pair of protrusions are arranged on the open end side of the recess, and the escape of the small-diameter portion from the recess abuts the outer periphery of the shaft of the pair of protrusions. It is configured to be blocked by.

[Action]

In the present invention, no work tools are required when attaching or removing the stopper to the shaft, and furthermore, the shaft does not bend or fall when attaching or detaching the stopper.

〔Example〕

An embodiment in which the present invention is applied to a stopper for pivotally supporting an optical head on a shaft in an optical disc player will be described with reference to FIGS. 1 to 11.

First, as shown in FIGS. 4 and 5, in the optical head 10, recording (writing) and / or reproducing (reading) is performed by irradiating the lower surface, which is the recording surface of the disk 11, with laser light and receiving the reflected light. ) Head 12 is provided. The optical head 10 is constructed so that it is guided by the guide shaft 13 and is moved together with the moving block 14 which is linearly moved in the radial direction of the disk 11 (direction of arrow c in FIG. 4).

That is, as shown in FIG. 5, a shaft 15 is horizontally fixed to the moving block 14 at a right angle to the moving direction. The optical head 10 is inserted into the shaft 15 via a holder 16 by a pair of protrusions 17 and is pivotally supported so as to be swingable. A compression coil spring 19 is inserted through the outer periphery of the spacer 18 inserted through the tip 15a of the shaft 15, and the compression coil spring 19 is prevented from coming off by a stopper 20 according to the present invention. Therefore, the optical head 10 is pressed and urged by the compression coil spring 19 and is pressure-bonded to the moving block 14 side.

In addition, the moving block 14 is a rack 21 provided below it.
Is driven by the pinion 23 of the motor 22 so that the arrow c
Is moved in the direction. The roller 24 is attached to the tip 15a side of the shaft 15.
Are guided by the guide rails 25.

And what is shown in FIGS. 1A to 3B is the stopper 20, which is the first embodiment of the present invention.

First, as shown in FIGS. 1A to 1C, the tip 15a of the shaft 15 is
A large-diameter portion 27 is provided on the side, and a small-diameter portion 28 is provided continuously on one end of the large-diameter portion 27 in the same axial line. The stopper 20 is attached to the large diameter portion 27 and the small diameter portion 28.

That is, as shown in FIGS. 3A and 3B, the stopper 20 is formed in a substantially circular shape by using a metal plate or the like, and a circular hole 30 is provided deviated from the center thereof. Further, a circular recess 31 which is partially continuous with the circular hole 30 is provided on one side surface 20a of the stopper 20. Further, in this circular recess 31, a substantially U-shaped groove 32 continuous with the circular hole 30 is provided. Here, the diameter A of the circular hole 30 and the circular recess 31 is the diameter B of the large diameter portion 27 of the shaft 15.
The width C of the groove 32 is slightly larger than the diameter D of the small diameter portion 28 of the shaft 15. Therefore, the groove 32
Can be inserted into the small diameter portion 28, and the circular recess 31 can be engaged with the outer peripheral surface 27a of the large diameter portion 27. The inner peripheral surface of the circular recess 31 that engages with the outer peripheral surface 27a of the large-diameter portion 27 constitutes the engaging portion 33.

First, as shown in FIG. 1A by a chain line to a solid line, the stopper 20 configured as described above is provided with a circular coil 30 in the large diameter portion 27 along the axis of the compression coil spring 19 in the arrow d direction. Insert against. Here, the diameter E of the shaft 15 is changed to the diameter A of the circular hole 30.
If it is made larger, the stopper 20 may be inserted in the direction of the arrow d until it comes into contact with the end of the shaft 15, which is good.

Next, as shown in FIG. 1B, the bottom portion 32a of the groove portion 32 of the stopper 20 is moved by the groove portion 32 from the first direction (direction of arrow e) which is a direction perpendicular to the axis to the small diameter portion 28. The small diameter portion 28 is inserted until it comes into contact with the outer peripheral surface 28a.

Thereafter, as shown in FIG. 1C, when the stopper 20 is moved in the second direction (arrow f direction) which is the axial direction, the circular recess 31 is fitted into the large diameter portion 27, and the engagement of the circular recess 31 is stopped. Joint part 33 is large diameter part
It engages with the outer peripheral surface 27a of 27. Actually, the stopper 20 is pressed by the spring force of the compression coil spring 19 and moves in the direction of arrow f. Further, here, the bottom 32a of the groove 32 is replaced by the circular recess 31
If the stopper 20 is moved in the direction of the arrow f, the engaging portion 33 will keep the outer peripheral surface 27a of the large diameter portion 27 if it is formed in the same axis as
Since it engages with, it is in good condition.

The stop 20 is locked to the shaft 15 as described above. When the engaging portion 33 of the stopper 20 engages with the outer peripheral surface 27a of the large diameter portion 27, the stopper 20 falls off from the shaft 15 in the direction opposite to the first direction (the arrow e'direction). Prevent.

By the way, when locking the stopper 20 to the shaft 15 as described above,
Since the stopper 20 does not need elasticity at all, work tools such as radio pliers are not necessary for its attachment. Further, the stopper 20 can be easily removed by the above-mentioned reverse operation without a working tool.

At the time of this attachment or detachment, no force is applied to the shaft 15 in the directions perpendicular to the axis (directions of arrows e and e '), and this force causes the shaft 15 to move in the direction of arrow g (direction of arrow g). First
There is no fear of bending or falling as shown in Fig. 1C).

Next, a swing mechanism of the optical head 10 swingably attached to the shaft 15 by the above-mentioned stopper 20 will be described. That is, as shown in FIGS. 4 and 5, a motor 35 and a worm wheel 37 rotatably driven by a worm 36 of the motor 35 are provided on one side surface of the moving block 14.
A pin 38 is fixed to the worm wheel 37 while being offset from the center. On the other hand, one side of the optical head 10 has a slope.
39 is formed, and the pin 38 is in contact with the slope 39. The optical head 10 is urged to rotate in the arrow h direction by a tension coil spring 40 stretched between the optical head 10 and the moving block 14.

When the disk 11 has an inclination (skew), this is detected by the skew detection device 41 provided in the optical head 10, and the motor 35 is rotated according to the detection output. Then, the worm wheel 37 is rotationally driven in the direction of arrow i, and the pin 38 and the tension coil spring 40 that come into contact with the slope 39 are contacted.
The optical head 10 is swung about the shaft 15 in the direction of the arrow h or h'by the cooperation with. As a result, the skew correction is performed by tilting the optical axis of the laser light from the recording and / or reproducing head 12 so that it is always perpendicular to the recording surface of the disk 11 in which it is tilted. The pin 38 is driven to rotate by about 16 ° to 18 °, whereby the optical head 10 is tilted by about ± 3 °.

Next, FIGS. 6 to 8 show a second embodiment of the stopper. That is, in the above-described first embodiment, the stopper 20 is provided with the circular hole 30.
Therefore, the large diameter portion 27 is once inserted, but in the stopper 43 of the second embodiment, this is directly inserted into the small diameter portion 28.

The stopper 43 is formed in a substantially circular shape by a sheet metal or the like, and a groove portion 44 to be inserted into the small diameter portion 28 is provided in a state cut in a substantially U shape from the outer periphery thereof. A circular recess 45 is provided on one side surface 43a of the stopper 43, and the inner peripheral surface of the circular recess 45 constitutes an engaging portion 46.

According to the second embodiment, since the stopper 43 can be directly inserted into the small diameter portion 28 by the groove portion 44 from the first direction (direction of arrow e), another part is attached to the tip 15a side of the shaft 15. Even if it is installed, it is convenient because it does not need to be removed.

Next, FIGS. 9 to 11 show a third embodiment of the stopper. That is, in the first and second embodiments described above, the stopper 20,
An engaging portion 33 formed by the inner peripheral surfaces of the circular recessed portions 31, 45 of 43,
By engaging 46 with the outer peripheral surface 27a of the large diameter portion 27, the stoppers 20 and 43 are prevented from falling out in the direction opposite to the first direction. It suffices if the engaging portion is provided on the front end side of the.

Therefore, the stopper 48 of the third embodiment is formed in a substantially U shape by using a sheet metal or the like, and the inner circumference thereof serves as the groove portion 49. Further, both ends of the stopper 48 are bent to the side surface 48a side at a substantially right angle to form an engaging portion 50.

According to the third embodiment, when the stopper 48 is inserted by the groove 49 from the first direction (direction of arrow e) and then moved in the second direction (direction of arrow f), the engaging portion 50 has a large diameter. Outer peripheral surface 27 of portion 27
engage a. The engaging portion 50 prevents the stopper 48 from falling out in the direction opposite to the first direction (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 modifications 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 the compression coil spring with the horizontal shaft to engage with the large diameter portion, but the compression coil spring is used at the lower end of the vertical shaft. It is also possible to engage with the large diameter portion without doing so. The small diameter portion may have the same diameter as the shaft portion.

The present invention is not limited to a stopper for pivotally supporting an optical block on a shaft in an optical disc player, but a stopper for pivotally supporting an attachment object on various shafts in various devices. Applicable to ingredients.

〔The invention's effect〕

As described above, according to the present invention, the stopper is inserted into the small diameter portion of the shaft by the groove portion without applying any force in the direction perpendicular to the axis, and then the stopper is moved in the axial direction of the shaft. By engaging the engaging portion of the stopper with the large-diameter portion of the shaft, the stopper can be prevented from slipping out in the direction opposite to the insertion direction into the shaft.

Therefore, unlike conventional E-rings that are elastically locked to the small diameter portion of the shaft, no work tools such as radio pliers are required when attaching or detaching the stopper to or from the shaft. The work of mounting or removing can be performed very easily.

Further, when the stopper is attached to or detached from the shaft, no force is applied to the shaft in a direction perpendicular to the axis, so that the shaft is not bent or collapsed. Especially in the case of a shaft for pivoting the optical head with extremely high accuracy as in the present embodiment, since there is no bending or tilt of the shaft, the accuracy can be reliably maintained and the reliability is high. Very expensive.

Furthermore, even if the stopper is attached to and removed from the shaft frequently, the small diameter portion of the shaft does not wear or the stopper itself does not plastically deform, so there is no need to replace parts. Very durable.

Further, in the present invention, since the small-diameter portion of the shaft is fitted in the recess provided in the stopper, the stopper is rotatable with respect to the shaft. Therefore, when a component that needs to be pivotally supported on this shaft, for example, this stopper is used as a stopper for an optical head, there is no possibility of disturbing the swing of the optical head or the like.

[Brief description of drawings]

1 to 11 show an embodiment in which the present invention is applied to a stopper for pivotally supporting an optical head on a shaft in an optical disk player, and FIGS. 1A to 1C. 2A to 2C are cross-sectional views of the main part in the first embodiment, FIGS. 2A to 2C are IIA-IIA lines in FIG. 1A, IIB-IIB lines and 1C in FIG. 1B, respectively.
IIC-IIC sectional view of the drawing, FIGS. 3A and 3B are perspective views of the stopper, FIG. 4 is a front view of the optical head portion, FIG. 5 is a side view of the optical head portion, and FIG. FIG. 7 is a perspective view of a stopper in the second embodiment, FIG. 7 is a sectional view of an essential part, and FIG.
VIII-VIII line sectional view, FIG. 9 is a perspective view of a stopper in the third embodiment, FIG. 10 is a sectional view of a main portion, and FIG. 11 is a sectional view of FIG.
It is a XI-XI line sectional view. Further, FIGS. 12 and 13 show the use state of the conventional stopper when the optical head is pivotally supported on the shaft in the optical disc player, and FIG. 12 is a sectional view of the main part. 13 is an enlarged sectional view taken along line XIII-XIII in FIG. In the reference numerals used in the drawings, 15 ... Shaft 20, 43, 48 ... Stopper 27 ... Large-diameter portion 27a ... Outer peripheral surface 28 ... Small-diameter portion 32, 44, 49 ... Groove 32a ... Bottom ( Recessed portions 33, 46 ... Engaging portions 50 ... Engaging portions (a pair of protruding portions).

Claims (1)

[Claims] 1. A mounting structure for a stopper which can be freely attached to and detached from a shaft, wherein the shaft has a small diameter portion interposed in a part in the axial direction, and the stopper is substantially in the axial direction. A recess into which the small-diameter portion is fitted when moved vertically, and a protrusion which is narrower than the diameter of the shaft so as to come into contact with the outer circumference of the shaft when moved in the axial direction after the small-diameter portion is fitted. A pair of protrusions provided, the pair of protrusions is arranged on the open end side of the recess, and the escape of the small diameter portion from the recess is caused by the shaft of the pair of protrusions. The attachment structure of the stopper configured to be blocked by contact with the outer circumference of the stopper.