JP2002267773A - Structure for inner resistor ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel structure for inner resistor ring capable of improving the operability of an inner resistor ring and extending the design variation thereof. SOLUTION: This structure comprises a pipe fixed to a hole extending through the inside from the side wall of a body, a shaft rotatably mounted on the pipe and having an inner gear and an outer gear at both the ends, the inner register ring arranged on the inside upper surface of the body and having a groove tooth on the lower surface, a bezel fixed to the body and having a collar part on the inside and a windshield on the upper surface, and an operating outer resistor ring rotatably mounted on the upper surface of the bezel and having a groove tooth on the lower surface. The positional regulation of the inner resistor ring is performed by the collar part of the bezel, and the inner register ring is rotated by engaging the inner gear with the groove tooth on the lower surface of the inner resistor ring, engaging the outer gear with the groove tooth on the lower surface of the outer resistor ring, and rotating the outer register ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an inner register ring provided on a wristwatch.

[0002]

2. Description of the Related Art As a general structure of an inner register ring, a structure in which an operating crown is rotated to rotate the inner register ring is disclosed. FIG.
It is sectional drawing which shows the structure of a general inner register ring. As shown in FIG. 5, the gear 6f attached to the inner end of the operation crown 6 is fitted to the groove teeth 3 on the lower surface of the inner register ring 3.
a, the inner register ring 3 is rotated by rotating the operation crown 6.

The outline of the internal registering structure in the prior art will be described below with reference to FIG. An inner register ring 3 is attached below the glass 2 that covers the upper surface of the cylindrical body 1 and on the inner periphery of the body 1. The inner register ring 3 has a ring-like shape and has a series of groove teeth 3a formed on the lower surface. An operating crown 6 is inserted through a pipe 5 press-fitted into a through hole 1a provided in the body 1.
Is inserted. The operating crown 6 includes a crown 6 a located on the outer periphery of the body 1 and a shaft 6 b inserted into the pipe 5. The crown 6a has a cylindrical shape,
A screw hole 6e is provided on one side. The shaft 6b has, at one end, a gear 6f that meshes with the groove teeth 3a of the inner register ring 3, a circumferential groove 6c at which a waterproof packing 9 is mounted at an intermediate portion, and a screw hole 6e at the other end of the crown 6a. A screw portion 6d is provided.

When mounting the operation crown 6,
A shaft 6b having a waterproof packing 9 mounted in the pipe 5.
To engage the gear 6f of the shaft 6b with the groove teeth 3a of the inner register ring 3. Next, the crown 6a and the shaft 6b are fixed by screwing. In this state, the operation crown 6 is rotated, and the inner register ring 3 is rotated. This prior art is disclosed in a published patent publication (JP-A-49-17759).

[0005]

However, when the internal register ring is rotated by rotating the operation reuse as in the example of the prior art, the outer diameter of the operation crown is maintained with the timepiece attached to the wrist. Is small, there is a possibility that about half of the outer circumference of the operation crown may come into contact with the arm. For this reason, the operation crown is difficult to turn,
Operability was very bad. Also, a large number of reuses are provided on the side wall of the timepiece, and there are many design restrictions, and it is not possible to expand the design variations.

(Object) It is an object of the present invention to provide a novel inner register ring structure which solves the problems of the prior art described above, improves the operability of the inner register ring, and can expand the design variation. It is in.

[0007]

In order to achieve the above-mentioned object, according to the present invention, the structure of the inner register ring according to the first aspect of the present invention is a structure of an inner register ring which rotates inside a wristwatch. A pipe fixed to a hole penetrating from the side wall of the body to the inside, a shaft rotatably attached to the pipe and having an internal gear and an external gear at both ends, and a groove tooth provided on the inner upper surface of the body and having a lower surface. An inner register ring, a bezel fixed to the body and having a flange portion on the inside and a windshield on the upper surface, and an outer operating register ring rotatably mounted on the upper surface of the bezel and having groove teeth on the lower surface. The position of the inner register ring is regulated by the bezel of the bezel, and the inner gear is engaged with the groove teeth on the lower surface of the inner register ring, and the outer register for operation is controlled. Said external gear is engaged with the groove teeth of the lower surface of grayed, said registering by rotating the operating outer registering is characterized by being configured to rotate.

The structure of the inner register ring according to the second aspect of the present invention is the structure of the inner register ring according to the first aspect, wherein the outer register ring for operation having groove teeth on the lower surface is provided inside the groove teeth. It has a saw tooth, and the saw tooth and a click spring disposed on the upper surface of the bezel are engaged, so that the saw tooth can be rotated with moderation.

The structure of the inner register ring according to the third aspect of the present invention is the inner register ring structure according to the first or second aspect, wherein the lower surface of the operation outer register ring has the groove teeth and the groove teeth on the lower surface. The number of teeth is the same as that of the inner saw tooth.

According to a fourth aspect of the present invention, in the structure of the inner register ring according to the first aspect, the shaft having gears at both ends has a circumferential groove. A waterproof gasket is attached to the groove, and the waterproof gasket is compressed between the inner wall of the pipe and the circumferential groove to ensure waterproofness.

According to a fifth aspect of the present invention, in the structure of the inner register ring according to the first or fourth aspect, the inner gear is disposed in an inner recess formed in the body. The external gear is formed outside the inner concave portion and is arranged in an outer concave portion having an opening in a side wall.

According to a sixth aspect of the present invention, in the structure of the inner register ring according to the fifth aspect, the outer recessed portion is provided with a can foot (band mounting portion) formed on the body. It is characterized by being formed between.

According to a seventh aspect of the present invention, in the structure of the inner register ring according to the first aspect of the present invention, the inner register ring which is rotated by the rotating operation of the operation outer register ring, The speed can be increased or decreased by changing the ratio of the number of teeth between the external gear and the internal gear.

The structure of the inner register ring according to the invention of claim 8 is the structure of the inner register ring according to claim 1 or claim 7, wherein the outer register ring for operation is formed in a circumferential shape formed on an inner wall. It is characterized in that it is rotatably attached by a polygonal spring, a polygonal resin ring or a resin ring disposed in the groove and the peripheral groove of the bezel formed at a position facing the peripheral groove.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 and 2
A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view showing the structure of the inner register ring in the present embodiment. FIG. 2 is a view showing a click spring used in the present embodiment.
FIG. 3 is a diagram showing a polygonal spring used in the present embodiment. Hereinafter, the present embodiment will be described with reference to the drawings.

The structure of the inner register ring that rotates inside the wristwatch according to the present embodiment includes a pipe 15 fixed to a hole 11a that penetrates from the side wall 11c of the body 11 to the inside.
A shaft 16 rotatably mounted on the pipe 15 and having an internal gear 17 and an external gear 16a at both ends; an inner register ring 13 disposed on the inner upper surface 11b of the body 11 and having groove teeth 13a on the lower surface; Bezel 1 fixed to the body 11 and having a flange 10a on the inside and a windshield 12 on the upper surface
0, and an outer register ring 14 for operation which is rotatably mounted on the upper surface 10b of the bezel 10 and has groove teeth 14a on the lower surface. Further, the flange 10 of the bezel 10
a is arranged so as to regulate the position of the inner register ring 13, and engages the inner gear 17 with a groove tooth 13 a on the lower surface of the inner register ring 13, and controls the outer register ring 14 for operation. The inner register ring 13 is rotated by engaging the outer gear 16a with the groove teeth 14a on the lower surface and rotating the outer register ring 14 for operation.

Next, each component will be described. As shown in FIG. 1, a cylindrical body 11 has a hole 11a penetrating through the inside from a side wall 11c, a flange 11j holding the inner register ring 13 on an inner inner periphery, and a step 11h on which a bezel 10 is arranged. An outer concave portion 11e for arranging the external gear 16a provided on the side wall 11c, and an inner concave portion 11d for arranging the internal gear 17 provided on the inside of the body 11; Recess 11d
Has an outer opening 11f and an inner opening 11g at 12 o'clock to 6 o'clock. Further, the outer recess 11e
Is a pair of cans (band attachment portion) formed on the body
18 are formed.

A pipe 15 is press-fitted and fixed in a hole 11a provided in the body 11. In this pipe 15,
A shaft 16 having an internal gear 17 and an external gear 16a at both ends is rotatably mounted. The shaft 16 has a circumferential groove 16b near the center, and a waterproof packing 19 is attached to the circumferential groove 16b, and the waterproof packing 19 is provided between the inner wall of the pipe 15 and the circumferential groove 16b. Waterproofing is ensured by compression. Further, the external gear 16a is integrally formed at one end of the shaft 16, and a square hole shaft 16c is formed at the other end, and a fixing circumferential groove 16d is formed inside the shaft 16c. On the other hand, the internal gear 17 has the square shaft 16
c, a square hole of the internal gear 17 is engaged with the square hole shaft 16c, and then an E-ring (stop ring) 24 is attached to the fixing circumferential groove 16d. Thus, the shaft 16 and the internal gear 17 are fixed.
Further, the internal gear 17 is arranged in the inner concave portion 11 d formed in the body 11. Also, the external gear 16a
Are formed outside the inner concave portion 11d and are disposed in the outer concave portion 11e having the outer opening 11f in the side wall 11c of the body 11.

A ring-shaped inner register ring 13 is disposed on the upper surface of the flange portion 11j, that is, the inner upper surface 11b of the body 11, and the inner lower surface of the inner register ring 13 has 60 teeth. Are formed. The groove teeth 13 a are engaged with an internal gear 17 mounted on the shaft 16 so that the rotation of the shaft 16 is transmitted to the inner register ring 13.

Further, a bezel 10 is provided on the upper surface of the step 11h of the body 11 located outside the inner register ring 13.
Has been fixed. The inside of the bezel 10 has a collar 10.
The windshield 12 is provided on the upper surface of the flange 10a, and is fixed to the windshield locking portion 10e. The flange 10a of the bezel is disposed so as to overlap the outer peripheral upper surface 13b of the inner register ring 13, and the position of the inner register ring 13 is regulated by the flange 10a of the bezel. Also, the bezel 10
A circumferential groove 1 is formed on the outer peripheral wall 10g of the windshield locking portion 10e.
0f, and furthermore, the windshield locking portion 1
0e, a series of circular grooves 10c are formed on the upper surface 10b of the bezel and a hole 10d is formed at the bottom thereof.
A ring-shaped click spring 20 is provided in Oc.

On the upper surface 10b of the bezel 10, the outer register ring 14 for operation is provided. A circumferential groove 14d is formed in the inner wall 14c of the outer register ring 14 for operation, and a circumferential groove 10f of the bezel 10 formed at a position opposite to the circumferential groove 14d.
And a polygonal spring 21 is provided. This polygon spring 21
The outer register ring 14 for operation is
It is rotatably attached to.

The polygonal spring 21 is, as shown in FIG.
This spring has a circular cross section, is provided with an appropriate uneven shape (corrugation) at an intermediate portion, is curved in a substantially circular shape, and has an open portion 21a on one side. The convex portion of the polygonal spring 21 is fitted and stopped in the peripheral groove 14 d of the outer register ring 14 for operation, and the concave portion of the polygonal spring 21 is engaged with the peripheral groove 10 f of the bezel 10. The outer register ring for operation 14 is configured to be rotatable without getting out of the bezel 10.
A knurl 14e is provided on the outer peripheral portion of the outer register ring 14 for operation, and the outer register ring 14 for operation is rotated by grasping the knurl 14e.

A groove tooth 14a is provided on the lower surface of the outer register ring 14 for operation.
Are formed so as to engage with. Further, the groove teeth 14
A saw tooth 14b is provided inside a. The number of teeth of the groove teeth 14a and the number of teeth of the saw teeth 14b are set to be the same, and each has 60 teeth. The circular groove 10 of the bezel is located at a position facing the sawtooth 14b.
c is provided. Furthermore, the circular groove 10c of the bezel
Are engaged with the saw teeth 14b of the outer register ring 14 for operation, so that the outer register ring 14 for operation can be rotated with moderation.

As shown in the perspective view of FIG. 2A, the click spring 20 has a notch 20a on the upper surface and a pin 20b on the lower surface. The pin 20b is engaged with a hole 10d provided in the circular groove 10c of the bezel as shown in FIG. 1 to stop the rotation of the click spring 20.
As shown in FIG. 2B, a saw tooth 14b provided on the lower surface of the outer operation register ring 14 and a notch 20a of the click spring 20 are engaged, and the notch 20a is The saw tooth 14b is clicked and slid. The details of the click spring 20 are already disclosed and will not be described.

As described above, the structure of the inner register ring according to the present embodiment is such that the inner gear 17 is engaged with the groove teeth 13a on the lower surface of the inner register ring 13 and the outer register ring 14 for operation. The inner gear ring 13a is configured to rotate by engaging the outer gear 16a with the groove teeth 14a on the lower surface and rotating the outer register ring 14 for operation.
Further, the outer register ring 14 for operation is configured to rotate with a click by engaging the saw teeth 14b of the outer register ring 14 for operation with the click spring 20.

Further, in the present embodiment, the shaft 16
The ratio of the number of teeth between the external gear 16a and the internal gear 17 was 1: 1 and the number of teeth was 60 each. As a result, the inner register ring 13 makes one rotation while the operation outer register ring 14 makes one rotation. That is, the inner register ring 13 rotated by the rotation operation of the outer operation register ring 14 rotates at the same speed as the outer register ring 14 for operation.

Next, the method of attachment will be described. Body 1
The pipe 15 is press-fitted into the hole 11a, and a shaft 16 provided with a waterproof packing 19 is inserted into the pipe 15 from an opening 11f on the outer concave portion 11e side of the body 11, and the external gear 1
6a is disposed in the outer recess 11e. Thereafter, the internal gear 17 is connected to the opening 11g on the side of the inner concave portion 11d of the body 11.
And attached to the square hole shaft 16c of the shaft 16 and disposed in the inner concave portion 11d of the body. Then, the internal gear 17
Securing circumferential groove in the inner side is formed at one end of the shaft 16 1
6d, an E-ring 24 is attached, and the internal gear 17 is
6 to one end. Thereafter, the groove teeth 13a of the inner register ring are engaged with the inner gear 17, and the inner register ring 13 is disposed on the inner upper surface 11b of the body 11 (the upper surface of the flange portion 11j).

Thereafter, the click spring 20 is moved to the circular groove 10c.
Is arranged and fixed on the step 11h of the body 11. At this time, the flange 10a of the hazel overlaps the outer upper surface 13b of the inner register ring 13, whereby the position of the inner register ring 13 is regulated. Thereafter, the windshield 12 is disposed on the bezel flange 10a, and the windshield locking portion 10e is provided.
Fixed to. Then, after the polygonal spring 21 is mounted on the circumferential groove 14d of the outer register ring for operation, the groove teeth 14a of the outer register ring engage with the outer gear 16a of the shaft, and the saw teeth of the outer register ring for operation. 14b is engaged with the clip spring 20 attached to the bezel 10, and the outer register ring for operation 14 is disposed on the upper surface 10b of the bezel 10. At this time, the polygonal spring 21 mounted on the peripheral groove 14d of the outer register ring for operation is engaged with the peripheral groove 10f of the bezel, and the outer register ring 14 for operation is rotatably attached to the bezel 10.

As described above, according to the present embodiment, the outer register ring for operation 14 is attached to the upper part of the wristwatch, and can be easily rotated even with the watch attached to the wrist. In addition, since the turning radius of the outer register ring for operation 14 is much larger than the turning radius of the crown 6a in the prior art, it can be easily rotated. Therefore, according to the structure of the inner register ring in the present embodiment in which the inner register ring 13 is rotated by rotating the outer register ring 14 for operation, the operability of the inner register ring 13 is greatly improved.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing the structure of the inner register ring in the second embodiment. The second embodiment has the same basic configuration as the first embodiment, but differs in the following points. In the first embodiment, the ratio of the number of teeth between the external gear and the internal gear formed on the shaft is set to 1: 1.
In this embodiment, the ratio is set to 2: 1. Further, in the first embodiment, the groove teeth of the outer register ring for operation are formed integrally with the outer register ring for operation, whereas in the second embodiment, the metal ring is interposed on the outer register ring. Groove teeth are formed on the plastic ring that is fixed in place. Further, in the first embodiment, a polygonal spring is used for engagement between the bezel and the outer register ring for operation, but in the second embodiment, a resin ring is used. Hereinafter, the present embodiment will be described with reference to the drawings, but the same components as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the body 11 is the same as in the first embodiment. Further, an internal gear 37 having 30 teeth is attached to the shaft 16. The inner register ring 33 has 60 teeth formed on the inner lower surface.
Each of the groove teeth 13 a is configured to mesh with an internal gear 37 attached to the shaft 16, so that rotation of the shaft 16 is transmitted to the internal register ring 33.

The bezel 10 is the same as in the first embodiment. Also, the inner wall 14 of the outer register ring 34 for operation.
The outer register ring 34 for operation is rotatably attached to the bezel 10 by the resin ring 23 disposed in the circumferential groove 14d formed in the c. and the circumferential groove 10f of the bezel 10 formed in the opposite position. Have been. The resin ring 23 is a ring-shaped member made of a resin having elasticity and having a circular cross section. The operation is the same as that of the polygonal spring 21 in the first embodiment, and the description is omitted because it is an existing technology. Further, the outer register ring for operation 34 is configured to rotate with a click by the click spring 20 similarly to the first embodiment.

A series of circular grooves 34f are provided on the lower surface of the outer operation register ring 34, and a ring-shaped metal ring 25 made of metal is press-fitted and fixed in the circular groove 34f. I have. Also, metal ring 25
A series of circular grooves 25a are provided on the lower surface of the, and a ring-shaped plastic ring 26 made of resin is press-fitted into the circular grooves 25a and fixed. Further, a groove tooth 26a having 60 teeth is formed on the lower surface of the plastic ring 26, and is disposed so as to mesh with the external gear 16a.

As described above, the structure of the inner register ring in the second embodiment is similar to the first embodiment in that the inner register ring 33 is rotated by rotating the outer register ring 34 for operation. Have been. Further, in the present embodiment, the number of teeth of the external gear 16a provided at one end of the shaft 16 is 60, which is the same as that of the first embodiment, whereas the internal gear 37 attached to the other end of the shaft 16 is provided. Has 30 teeth, the external gear 16a and the internal gear 3
The ratio of the number of teeth to 7 is 2: 1.
Further, a Mizoha 13a of the inner register ring 33, the number of teeth of the Mizoha 26a of Puraringu 26 in the operation outside registering 34 is fixed via a metal ring 25 is a 60, respectively, first This is the same as the embodiment. As a result, while the outer register ring for operation 34 makes one rotation, the inner register ring 33 makes a half turn. That is, the speed of the inner register ring 33 which is rotated by the rotation of the operation outer register ring 34 is reduced by setting the ratio of the number of teeth between the outer gear 16a and the inner gear 27 to 2: 1. Will be. Note that the mounting method in the present embodiment is the same as that in the first embodiment, and a description thereof will be omitted.

In the present embodiment, the outer ring for operation 34 and the plastic ring 26 having the groove teeth 26a are provided.
Since these are separate, there is an advantage that each part can be easily manufactured. Also, in the present embodiment, the same effect as in the first embodiment can be obtained.

Further, in this embodiment, an example will be described in which the rotational speed of the inner register ring which is rotated by the rotation operation of the operating outer register ring is reduced by changing the ratio of the number of teeth between the outer gear and the inner gear. However, it is possible to increase or decrease the rotation speed of the inner register ring by changing the ratio of the number of teeth between the outer gear and the inner gear.

In this embodiment, a polygonal spring and a resin ring have been described as examples of a member for rotatably attaching the outer register ring for operation to the bezel. Existing components can also be used.

[0038]

As described above, according to the structure of the inner register ring of the present invention, a novel operation of rotating the inner register ring by a moderate (by a click spring) rotating operation of the outer register ring for operation provided on the upper surface of the bezel. An internal registering structure can be provided. Thus, the inner register ring can be easily rotated even with the watch attached to the wrist, and the operability of the inner register ring is improved. Further, since it is not necessary to provide a crown for rotating the inner register ring on the side wall of the timepiece, design restrictions are eliminated and design variations can be expanded.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of an inner register ring according to a first embodiment of the present invention.

FIG. 2 is a view showing a clip spring according to the first embodiment of the present invention.

FIG. 3 is a view showing a polygonal spring according to the first embodiment of the present invention.

FIG. 4 is a sectional view of an inner register ring according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a structure of an inner register ring according to the related art.

[Explanation of symbols]

 Reference Signs List 1 trunk 1a trunk through hole 2 glass 3 inner register ring 3a groove tooth 5 pipe 6 operating crown 6a crown 6b shaft 6c circumferential groove 6d screw part 6e screw hole 6f gear 9 waterproof packing 10 bezel 10a bezel flange 10b bezel Top surface 10c Circular groove of bezel 10d hole 10e Windshield lock part 10f Peripheral groove 10g Outer wall 11 Body 11a Body hole 11b Inside upper surface of body 11c Side wall of body 11d Inner recess of body 11e Outside recess of body 11f Outside of body Opening 11g Inner opening of trunk 11h Step of trunk 11j Flange 12 Windshield 13 Inner register ring 13a Groove teeth of inner register ring 13b Outer upper surface of inner register ring 14 Outer register ring for operation 14a Outer register ring for operation Groove tooth 14b Outer register ring for operation Saw teeth 14c inner wall of the outer register ring for operation 14d circumferential groove of the outer register ring for operation 14e knurl 15 pipe 16 shaft 16a external gear 16b circumferential groove at the center part 16c square shaft 16d circumferential groove for fixing 17 internal gear 18 Can foot 19 Waterproof packing 20 Click spring 20a Notch 20b Pin 21 Polygon spring 21a Open part 23 Resin ring 24 E-ring (stop ring) 25 Metal ring 25a Circular groove on lower surface of metal ring 26 Plastic ring 26a Groove teeth of plastic ring 33 Internal register ring 34 Outer register ring for operation 34f 37 inner gear of circular groove on the lower surface

Claims (8)

[Claims] In a structure of an inner register ring rotating inside a wristwatch, a pipe fixed to a hole penetrating from the side wall of the body to the inside, and an inner gear and an outer gear mounted rotatably on the pipe at both ends are provided. An inner register ring disposed on the inner upper surface of the body and having groove teeth on the lower surface, a bezel fixed to the body and having a flange portion on the inside and a windshield on the upper surface, and rotating on the upper surface of the bezel An outer register ring for operation, which is freely attached and has groove teeth on the lower surface, a position of the inner register ring is regulated by a flange portion of the bezel, and the inner gear is provided on a groove tooth on a lower surface of the inner register ring. The inner register is engaged by engaging the outer gear with groove teeth on the lower surface of the outer register ring for operation and rotating the outer register ring for operation. Structure of registering inner grayed is characterized by being configured to rotate. 2. The operating outer register ring having groove teeth on a lower surface has a saw tooth inside the groove teeth, and the saw tooth engages with a click spring disposed on an upper surface of the bezel to reduce moderation. The inner register ring structure according to claim 1, wherein the inner register ring is rotatable. 3. The inner register ring according to claim 1, wherein the number of teeth of the groove teeth and the number of saw teeth on the inner side thereof are formed on the lower surface of the outer register ring for operation. Structure. 4. The shaft having gears at both ends has a circumferential groove, and a waterproof packing is attached to the circumferential groove, and the waterproof packing is provided between an inner wall of the pipe and the circumferential groove. 2. The structure of the inner register ring according to claim 1, wherein waterproofness is secured by compression. 5. The internal gear is arranged in an inner recess formed in the body, and the external gear is formed in an outer recess formed outside the inner recess and having an opening in a side wall. The structure of the inner register ring according to claim 1 or 4, wherein: 6. The inner register ring structure according to claim 5, wherein the outer concave portion is formed between a can foot (a band mounting portion) formed on the body. 7. The internal register ring, which rotates by rotating the external register ring for operation, can increase or decrease the speed by changing the ratio of the number of teeth between the external gear and the internal gear. 2. The structure of claim 1, wherein the structure is a register ring. 8. The operating outer register ring includes a polygonal spring, a polygonal spring disposed in a peripheral groove formed in an inner wall and a peripheral groove of the bezel formed in a position opposite to the peripheral groove. 8. The structure of the inner register ring according to claim 1, wherein the inner register ring is rotatably mounted by a resin ring or a resin ring.