TWI709840B - Knob regulating mechanism - Google Patents

Abstract

A knob regulating mechanism includes a base, a first gear wheel, a second gear wheel, a limit element, an adjusting element, a locating element and an adjusting cap. The base includes a first stacking portion and a second stacking portion. The first gear wheel having a plurality of first slots is disposed on the second stacking portion. The second gear wheel having a plurality of second slots is disposed on the first stacking portion. The limit element is disposed on the base. The locating element is disposed within the limit element. The adjusting cap is connected to the locating element through a fixing element which is passed through the limit element and is adapted to allow the locating element to move relative to the limit element and the second gear wheel. The adjusting cap is configured to allow the limit element and the locating element to rotate simultaneously.

Description

Knob adjustment mechanism

The invention relates to a knob adjustment mechanism, in particular to a knob adjustment mechanism with a two-stage adjustment effect.

Traditional sights usually use a knob adjustment mechanism to compensate for impact. The knob adjustment mechanism is usually provided with a gear ring, and a plurality of grooves are formed on the gear ring at equal intervals. The knob adjustment mechanism is rotating At the same time, it will drive a steel ball to move between the grooves and make a rattling sound to remind the user. However, when the user wants to change the sound, he must replace the internal components of the knob adjustment mechanism or even replace the entire knob adjustment mechanism, which causes inconvenience for the user in use.

In view of this, the object of the present invention is to provide a knob adjustment mechanism, the knob adjustment mechanism is provided with two toothed discs, so that the ball can emit two different sounds through the toothed discs, and by switching an adjustment cover Position, control the knob adjustment mechanism to emit different sounds.

A preferred embodiment of the knob adjusting mechanism of the present invention includes a base, a first chainring, a second chainring, a limiting member, an adjusting member, a positioning member and an adjusting cover. The base includes a A first receiving portion and a second receiving portion, the first chainring is arranged on the second receiving portion and having a plurality of first grooves, the second chainring is arranged on the first receiving portion, And have plural The second groove, the limiting member is provided on the base, the positioning member is provided on the inner side of the limiting member, and can move relative to the limiting member along the axis of the base, the adjusting cover is provided with a The fixing member axially penetrates the limiting member to be combined with the positioning member, and can drive the positioning member to move relative to the limiting member and the second chainring along the axial direction of the base. Rotating the adjusting cover can The limiting element and the positioning element are simultaneously driven to rotate by the fixing element.

In another embodiment, the fixing member further includes at least two fixing screws, one end of the fixing screws is disposed on the adjusting cover, and the other end is disposed on the positioning member after passing through the limiting member.

In another embodiment, the positioning member can be positioned at a first position or a second position relative to the limiting member.

In another embodiment, the limiting member has at least one engaging mechanism, and the engaging mechanism can be movably engaged in the first position or the second position, respectively, wherein the first position and the second position The positions are respectively located in a first groove and a second groove of the positioning element, and the first groove and the second groove are formed on the inner peripheral wall of the positioning element, wherein the first groove and The second grooves are respectively annular.

In another embodiment, the engaging mechanism includes an elastic member and a ball, the elastic member and the ball are disposed in a hole on the limiting member, and the ball card can be pressed by the elastic force of the elastic member Fit in the first groove or the second groove.

In another embodiment, when the positioning member is positioned at the first position, the adjustment cover is positioned at a third position, and when the positioning member is positioned at the second position, the adjustment cover is positioned at a fourth position. Position, wherein when the positioning member is positioned at the first position, the limiting member abuts on the first chainring, and the positioning member abuts on a flat surface inside the limiting member, when the positioning When the member is positioned at the second position, the limiting member abuts on the first chainring, and the positioning member abuts on the second chainring.

In another embodiment, the limiting member has at least one elastic member and a sphere, the elastic member and the sphere are disposed in a hole on the limiting member, and the first chainring further has a plurality of planes, The planes are formed between the first grooves. When the positioning member is positioned at the first position or the second position, the elastic force of the elastic member can push the ball against the first tooth On the disk, rotating the limiting member at this time can drive the sphere to move in turn between the first grooves and the planes.

In another embodiment, the positioning member has at least one elastic member and a sphere. The elastic member and the sphere are disposed in a hole on the positioning member. When the positioning member is positioned at the second position, by The elastic force of the elastic member can push the ball to abut on the second gear plate, and at this time, rotating the positioning member can drive the ball to move between the second grooves.

In another embodiment, the present invention further includes a scale ring and a decoration ring, the outer side of the scale ring has a reference line, the wall of the decoration ring is formed with a gap, and the scale ring is arranged on the outer side of the base, The ornament ring is arranged on the outer side of the scale ring, and the notch is aligned with the reference line.

In another embodiment, the outer side of the adjustment cover has a fine adjustment scale, and the outer side of the limiting member has a coarse adjustment scale. When the positioning member is positioned at the first position, the opening can be seen The reference line and the coarse adjustment scale. When the positioning member is positioned at the second position, the reference line and the fine adjustment scale can be seen from the gap.

1: Knob adjustment mechanism

10: Adjust cover

20: limit piece

40: The first chainring

50: positioning parts

60: fixed parts

70: second chainring

80: adjustment piece

90: Pedestal

100: Adjust the upper cover

101: Washer

102: pressure ring

103: Adjust the cover body

104: fixing screw

201: Limiter body

202: adjustment ring

241: fixed parts

242: second elastic part

243: Second Sphere

260: pressure ring

302: Scale ring

303: Decorative ring

304: Washer

401: first groove

402: Sector Plane

501: Through hole

561: first sphere

562: The first elastic part

572: The Third Sphere

571: third elastic part

601: Blind Hole

602: first convex

603: second convex

604: limit slot

651: first ring groove

652: second ring groove

701: second groove

901: fixed seat

902: Washer

903: pressure ring

904: base body

905: adjustment hole

1031: convex

1032: Through hole

2011: Through hole

2012: Through hole

2021: Through hole

3031: gap

9011: Through hole

9021: Through hole

9031: Through hole

Figure 1 is an exploded structural view of one embodiment of the knob adjustment mechanism of the present invention.

Figure 2 is a cross-sectional view of the structure of the knob adjustment mechanism in Figure 1 after being assembled.

Figure 3 is a cross-sectional view of the structure of the knob adjustment mechanism in Figure 1 after being assembled.

Figure 4A is a schematic diagram of the structure of the first chainring and the second chainring in Figure 1.

Figure 4B is a schematic diagram of the structure of the first chainring and the second chainring in Figure 1.

Figure 5 is a schematic diagram of the appearance of the knob adjustment mechanism in Figure 2.

Figure 6 is a schematic diagram of the appearance of the knob adjustment mechanism in Figure 3.

Figure 7 is a schematic diagram of the appearance of the knob adjustment mechanism in Figure 2 when the decorative ring is not assembled.

Figure 8 is a schematic diagram of the appearance of the knob adjustment mechanism in Figure 3 when the decorative ring is not assembled.

In one embodiment of the present invention, the knob adjusting mechanism 1 includes an adjusting cover 10, a limiting member 20, a positioning member 50, a first chainring 40, a second chainring 70, an adjusting member 80, and a base 90 , Wherein, rotating the adjustment cover 10 can make the knob adjustment mechanism 1 make a sound, and drive the adjustment member 80 to move relative to the base 90 along the axis of the base 90, and the adjustment cover 10 can be positioned at two different positions. The sound emitted by the knob adjustment mechanism 1. The assembly of these components will be described in detail below: Please refer to Figure 1. Figure 1 depicts an exploded structure view of the knob adjustment mechanism 1. In this embodiment, the adjustment cover 10 includes an adjustment upper cover 100 and an adjustment cover body 103. The cover body 103 has a convex portion 1031, three through holes 1032 are respectively formed on a flat portion of the convex portion 1031, and three pressure rings 102 are respectively arranged on the flat portion corresponding to the positions of the through holes 1032, and a gasket After 101 is set on a flange portion of the convex portion 1031, the adjustment upper cover 100 is sleeved on the convex portion 1031, and the gasket 101 is sandwiched between the adjustment upper cover 100 and the adjustment cover body 103. This arrangement can increase the adjustment cover 10 Tightness. Then put a fixing piece including at least two fixing screws After one end of the fixing screw 104 passes through the through holes 1032, the fixing screws 104 are fixed to the inner side of the adjusting cover body 103 by the pressing rings 102, and the other end of the fixing screws 104 can be movably passed through Over the limit piece 20.

Please refer to Figures 2 and 3 at the same time. Figures 2 and 3 respectively describe the structural cross-sectional views of the adjustment cover 10 in Figure 1 when positioned at two different positions. The limiting member 20 includes a limiting member body 201 and a Adjusting ring 202 and a fixing member 60. Three through holes 2011 are respectively formed on the stopper body 201. A plane portion corresponding to the position of the fixing screws 104, so that the fixing screws 104 can be movably penetrated therein , The stopper body 201 is fixed to a first convex portion 602 on the fixing member 60 by a pressure ring 260 and a through hole 2012 located in the center of the plane portion, and the adjusting ring 202 is arranged inside the stopper body 201 to fix There is a second convex portion 603 on the member 60 relative to the first convex portion 602. The center of the second convex portion 603 forms a limiting groove 604, and the adjusting member 80 is movably disposed in the limiting groove 604. It should be noted that, since the adjusting cover 10, the fixing screws 104 and the limiting member 20 form a linkage relationship, rotating the adjusting cover 10 can drive the limiting member 20 and the adjusting member 80 to rotate together. In addition, the limiting member 20 is disposed on the base 90 by the second convex portion 603, and the adjusting member 80 extends outward from the limiting slot 604 and passes through an adjusting hole 905 located in the center of the base 90. The adjusting member 80 It can be an adjustment screw. Since an internal thread (not shown) on the inner peripheral wall of the adjustment hole 905 and an external thread on the outer peripheral wall of the adjustment member 80 cooperate with each other, rotating the adjustment cover 10 can drive the adjustment member 80 relative to the base 90 Perform an axial movement.

As shown in Figures 2 and 3, the fixing screws 104 pass through the other end of the limiting member body 201 and are fixed to the positioning member 50. At this time, the rotating adjustment cover 10 can be driven by the fixing screws 104 to drive the limiting member 20, The positioning member 50 and the adjusting member 80 rotate together, and the positioning member 50 can move along the axial direction of the base 90 in the gap between the outer peripheral wall of the fixing member 60 and the inner peripheral wall of the adjusting ring 202, Specifically, a plurality of first teeth are formed on the inner peripheral wall of the adjusting ring 202, and the positioning member 50 is engaged with the inner peripheral wall of the adjusting ring 202 through the plurality of second teeth on the outer peripheral wall. In addition, two blind holes 601 Formed on the outer peripheral wall of the fixing member 60, each blind hole 601 is provided with a first ball 561 and a first elastic member 562. The elastic force of the first elastic member 562 pushes the first ball 561 so that the first The ball 561 abuts against the inner peripheral wall of the positioning member 50. A first annular groove 651 and a second annular groove 652 are formed on the inner peripheral wall of the positioning member 50. The second annular groove 652 is larger than the second annular groove 652. An annular groove 651 is closer to the adjustment cover 10, and the positioning member 50 can be relative to the limiting member 20 by the first spheres 561 being engaged with the first annular groove 651 or the second annular groove 652. It is located at a first position or a second position. It is worth noting that because the adjustment cover 10 and the positioning member 50 are combined with the fixing screws 104, the adjustment cover 10 can be guided by the fixing screws 104 Positioned in a third position or a fourth position.

As shown in Figures 2 and 3, the base 90 includes a fixing seat 901 and a base body 904. A pressing ring 903 is first arranged on a flat part inside the base body 904, and a gasket 902 is then arranged on the pressing On the ring 903, the fixing seat 901 is set on a flange portion of the base body 904. Specifically, the center of the pressure ring 903 has a through hole 9031 with a diameter substantially equal to the second convex portion 603, and the center of the washer 902 It also has a through hole 9021 with a diameter approximately equal to the second convex portion 603. In addition, the second chainring 70 is disposed on a first receiving portion inside the fixing base 901, and the first chainring 40 is disposed on the fixing base 901 A second receiving portion, the center of the fixing seat 901 has a through hole 9011, and the second convex portion 603 penetrates the second chainring 70, the through hole 9011, the through hole 9021, and the through hole 9031 in sequence, and then abuts against the base The base body 904 has a scale ring 302 fixed on the outer side of the base 90 and fixed on the inner side of a decorative ring 303 together with the base 90. In this embodiment, the first receiving portion is a flat portion, and the second receiving portion is a flange portion.

Please refer to Figures 4A and 4B. Figures 4A and 4B describe the structure of the first sprocket 40 and the second sprocket 70. A plurality of radial first grooves 401 are formed at equal intervals on the first sprocket 40. The A plurality of sector-shaped planes 402 are formed between the first grooves 401, and a plurality of radial second grooves 701 are formed at equal intervals on the second gear plate 70. The number of the second grooves 701 is more than The number of the first grooves 401. As shown in Figure 1, the wall of the adjusting ring 202 is formed with two-axis through holes 2021. Each through hole 2021 is provided with a fixing member 241, a second elastic member 242, and a second ball 243 in sequence to fix The member 241 is first fixed to the through hole 2021, and then the second ball 243 is pressed by the elastic force of the second elastic member 242, so that the second ball 243 abuts on the first chainring 40. Therefore, when the adjusting ring 202 rotates, Will drive the second ball 243 to move between the first grooves 401 to emit a first sound. On the other hand, the positioning member 50 has three through holes 501 corresponding to the fixing screws 104 for the fixing The screw 104 is fixed therein, and each through hole 501 is further provided with a third ball 572 and a third elastic member 571. The fixing screw 104 presses the third ball 572 by the elastic force of the third elastic member 571 to make the third The ball 572 abuts on the second chainring 70. Therefore, when the positioning member 50 rotates, the third ball 572 will be driven to move between the second grooves 701 to emit a second sound.

During operation, as shown in Figure 2, when the adjustment cover 10 is in the third position, turning the adjustment cover 10 will only cause the knob adjustment mechanism 1 to emit the first sound. As shown in Figure 3, when the adjustment cover 10 When in the fourth position, rotating the adjustment cover 10 will cause the knob adjustment mechanism 1 to emit the first sound and the second sound at the same time. Specifically, when the adjustment cover 10 is at the third position, the positioning member 50 is positioned at the first position and abuts against a flat surface inside the limiting member 20 at the same time, and the first spheres 561 are engaged with the first position. Ring groove 651. At this time, the second balls 243 abut on the first chainring 40, but the third balls 572 do not abut on the second chainring 70, so when the adjustment ring When both 202 and the positioning member 50 rotate at the same speed, only the second balls 243 move between the first grooves 401. On the other hand, when the adjusting cover 10 is located at the fourth position, the positioning member 50 is positioned In the second position, the first spheres 561 are engaged with the second annular groove 652, as shown in Figures 4A and 4B, at this time the second spheres 243 abut against the first chainring 40, and The third balls 572 abut on the second chainring 70. Therefore, when the adjusting ring 202 and the positioning member 50 rotate at the same speed, the third balls 572 move between the second grooves 701. At this time, in order to match the spacing between the second grooves 701 on the second chainring 70, the second balls 243 on the first chainring 40 will alternately move on the first grooves 401 and the sector planes 402. between. It is worth noting that the spacing between the second trenches 701 is smaller than the spacing between the first trenches 401, or the number of the second trenches 701 is more than the number of the first trenches 401 If the first sound is heard, it means that the adjustment cover 10 has a larger rotation once, and the adjustment member 80 has moved a greater distance relative to the base 90 (that is, the impact compensation amount is greater). On the contrary, the second sound is heard It means that the amplitude of one rotation of the adjustment cover 10 is small, and the distance that the adjustment member 80 moves relative to the base 90 is small (that is, the amount of spring compensation is small).

It should also be noted that when the adjustment cover 10 is located at the fourth position, rotating the adjustment cover 10 will drive the adjustment ring 202 and the positioning member 50 to rotate at the same rate, so that the knob adjustment mechanism 1 simultaneously emits the first sound and The second sound, but in fact the user can only distinguish the second sound, because when the second sphere 243 moves from the fan-shaped plane 402 to the first groove 401, the sound emitted will be the same as the third sphere 572. The sound emitted between the second grooves 701 overlaps, and when the second ball 243 moves from the first groove 401 to the fan-shaped plane 402, there is no sound, but the third ball 572 moves to the other second at the same time. There will still be a sound between the two grooves 701, so when the adjustment cover 10 is in the fourth position, rotate the adjustment cover 10 The user will hear the second sound.

The foregoing descriptions are based on the premise that the number of the second grooves 701 is greater than the number of the first grooves 401. However, in another embodiment, the number of the second grooves 701 may also be It is equal to the number of the first trenches 401 (that is, the spacing between the second trenches 701 is equal to the spacing between the first trenches 401). Specifically, the second chainring 70 can also adopt the structure of the first chainring 40, that is, a plurality of radial second grooves 701 are formed at equal intervals on the second chainring 70, and the second grooves 701 In the meantime, a plurality of fan-shaped planes (not shown) are formed. During operation, when the adjusting cover 10 is located at the third position, since the third balls 572 are not in contact with the second chainring 70, as described above, Rotating the adjustment cover 10 will only cause the knob adjustment mechanism 1 to emit the first sound. It is worth noting that when the adjustment cover 10 is at the fourth position, the second balls 243 abut against the first chainring 40, and The third balls 572 abut against the second chainring 70. Since the first chainring 40 and the second chainring 70 have the same structure, turning the adjustment cover 10 will cause the knob adjustment mechanism 1 to emit two first sounds, but in fact The user will hear the second sound. This is because although the structure of the first chainring 40 and the second chainring 70 are the same, when assembling, if the first grooves 401 correspond to the second chainring 70 The position of the fan-shaped planes (or the position of the second grooves 701 corresponding to the fan-shaped planes 402), when the second ball 243 moves from the fan-shaped plane 402 to the sound emitted by the first groove 401, the first groove 401 The three sphere 572 moves from the second groove 701 to a fan-shaped plane without making a sound, and when the second sphere 243 moves from the first groove 401 to the fan-shaped plane 402 without making a sound, the third sphere 572 is Move from the fan-shaped plane to the second groove 701 and make a sound. In short, when the adjustment cover 10 is in the fourth position, the adjustment cover 10 is rotated to make the second ball 243 and the third ball 572 move respectively on the two gears emitted by the first chainring 40 and the second chainring 70 of the same structure. The first sound does not overlap, but is combined into the second sound.

Among them, the first ball 561, the second ball 243, or the third ball 572 mentioned in the embodiment of this specification can be a steel ball, and the first elastic element 562, the second elastic element 242 or the third elastic element 571 can be One spring.

Please refer to Figures 2, 3, 5, 6, 7 and 8 at the same time. Figures 5 and 6 are the appearance diagrams of the knob adjustment mechanism 1 in Figures 2 and 3 respectively. Figures 7 and 8 are Figures 2 and 3 respectively. A schematic diagram of the appearance of the knob adjustment mechanism 1 when the decorative ring 303 is not combined. The outer side of the adjustment cover body 103 has a fine adjustment scale corresponding to the second grooves 701, and the outer side of the stop body 201 has a fine adjustment scale corresponding to the second grooves 701. A rough adjustment scale of a groove 401, a reference line on the outer side of the scale ring 302, a gap 3031 is formed on the wall of the decoration ring 303, and the rough adjustment or the fine adjustment scale can be known from the gap 3031. The position of the reference line is used to confirm the actual impact compensation. When the adjustment cover 10 is positioned at the fourth position, the adjustment cover body 103 will completely cover the limiter body 201, that is, the coarse adjustment scale will be covered At this time, only the fine adjustment scale and the reference line can be seen from the gap 3031. Conversely, when the adjustment cover 10 is positioned at the third position, the coarse adjustment scale and the reference line can be seen from the gap 3031 .

In another embodiment, the knob adjustment mechanism 1 can be set on a body (not shown) of a sight (not shown) by a washer 304 to perform bounce compensation. After the assembly is completed, the adjustment member 80 is Abutting against an optical unit (not shown) inside the main body, so the optical unit can be moved relative to the main body by rotating the adjusting cover 10 to achieve the ballistic or wind deviation compensation function of the sight. In particular, the sight can provide users with two operation modes for impact compensation: When the target is at a short distance, due to the need to quickly adjust the trajectory, the user can use the first method of impact compensation. As shown in Figures 2, 5 and 7, the adjustment cover 10 is positioned at the third position. In order to provide a larger impact compensation for the sight, the knob adjustment mechanism 1 The first sound can be issued to remind the user. At the same time, the user can confirm the current impact compensation amount by checking the coarse adjustment scale pointed to by the reference line through the notch 3031. On the other hand, when the target is at a long distance , Due to the need for precise ballistic adjustment, the user can use the second method of impact compensation. As shown in Figures 3, 6 and 8, the adjustment cover 10 is positioned at the fourth position to provide a smaller projectile. With the compensation amount, the knob adjustment mechanism 1 can emit the second sound to remind the user. At the same time, the user can check the fine adjustment scale indicated by the reference line through the notch 3031 to confirm the spring compensation amount.

1: Knob adjustment mechanism

40: The first chainring

50: positioning parts

60: fixed parts

70: second chainring

80: adjustment piece

100: Adjust the upper cover

101: Washer

102: pressure ring

103: Adjust the cover body

104: fixing screw

201: Limiter body

202: adjustment ring

241: fixed parts

242: second elastic part

243: Second Sphere

260: pressure ring

302: Scale ring

303: Decorative ring

304: Washer

501: Through hole

561: first sphere

562: The first elastic part

572: The Third Sphere

571: third elastic part

601: Blind Hole

602: first convex

603: second convex

901: fixed seat

902: Washer

903: pressure ring

904: base body

905: adjustment hole

1031: convex

1032: Through hole

2011: Through hole

2012: Through hole

2021: Through hole

9011: Through hole

9021: Through hole

9031: Through hole

Claims (10)

A knob adjusting mechanism includes: a base, including a first receiving portion and a second receiving portion; a first chainring arranged on the second receiving portion, the first chainring has a plurality of A first groove; a second toothed plate, arranged on the first receiving portion, the second toothed plate has a plurality of second grooves; a limiting member, provided on the base; a positioning member, provided On the inner side of the limiting member and movable relative to the limiting member along the axial direction of the base; an adjustment cover with a fixing member axially penetrating the limiting member to be combined with the positioning member, and The positioning member can be driven to move relative to the limiting member and the second gear plate along the axial direction of the base. Rotating the adjusting cover can simultaneously drive the limiting member and the positioning member to rotate by the fixing member. For the knob adjustment mechanism described in item 1 of the scope of patent application, the fixing member further includes at least two fixing screws. One end of the fixing screws is set on the adjustment cover, and the other end passes through the limiting member and then is set on the Positioning pieces. For the knob adjustment mechanism described in item 1 of the scope of patent application, the positioning member can be positioned at a first position or a second position relative to the limiting member. For example, the knob adjustment mechanism described in item 3 of the scope of patent application, wherein the limiting member has at least one engaging mechanism, and the engaging mechanism can be movably engaged in the first position or the second position, respectively, wherein the The first position and the second position are respectively located in a first groove and a second groove of the positioning member, and the first groove and the second groove are formed on the inner peripheral wall of the positioning member, wherein , The first groove and the second groove are respectively annular. Such as the knob adjustment mechanism described in item 4 of the scope of patent application, wherein the engaging mechanism includes a An elastic element and a first ball, the first elastic element and the first ball are disposed in a hole on the limiting element, and the first ball can be pressed by the elastic force of the first elastic element to be engaged with the The first groove or the second groove. Such as the knob adjustment mechanism described in item 3 of the scope of patent application, wherein when the positioning member is positioned at the first position, the adjustment cover is positioned at a third position, and when the positioning member is positioned at the second position, the The adjusting cover is positioned at a fourth position, wherein when the positioning member is positioned at the first position, the limiting member abuts on the first chainring, and the positioning member abuts on the inner side of the limiting member A flat portion. When the positioning member is positioned at the second position, the limiting member abuts on the first chainring, and the positioning member abuts on the second chainring. The knob adjustment mechanism described in item 6 of the scope of patent application, wherein the limiting member has at least one second elastic member and a second ball, and the second elastic member and the second ball are disposed on the limiting member. In the hole, the first chainring is further provided with a plurality of planes, and the planes are formed between the first grooves. When the positioning member is positioned at the first position or the second position, by the The elastic force of the two elastic elements can push the second ball to abut on the first gear plate. At this time, rotating the limiting element can drive the second ball to move between the first grooves and the planes in turn . The knob adjustment mechanism according to item 7 of the scope of patent application, wherein the positioning member has at least a third elastic member and a third ball, and the third elastic member and the third ball are arranged in a hole on the positioning member When the positioning member is positioned at the second position, the third ball can be pressed against the second chainring by the elastic force of the third elastic member. At this time, rotating the positioning member can drive the third The ball moves between the second grooves. As described in item 3 of the scope of patent application, the knob adjustment mechanism further includes a scale ring and a decorative ring. The outer side of the scale ring has a datum line, and a gap is formed on the wall of the decorative ring. The scale ring is arranged on the outer side of the base, the ornament ring is arranged on the outer side of the scale ring, and the notch is aligned with the reference line. For the knob adjustment mechanism described in item 9 of the scope of patent application, the outer side of the adjustment cover has a fine adjustment scale, and the outer side of the limiting member has a coarse adjustment scale. When the positioning member is positioned at the first position, The reference line and the coarse adjustment scale can be seen from the gap, and when the positioning member is positioned at the second position, the reference line and the fine adjustment scale can be seen from the gap.

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