JPH0535351Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical field of the invention] This invention relates to a time adjustment mechanism for a hand clock. [Prior art and its problems] In general, the time adjustment mechanism of a pointer-type watch involves pulling out the winding stem of a reuse, etc., so that the Tsuzumi wheel is engaged with the adjustment wheel (hereinafter referred to as the small iron wheel), and the winding stem is turned in this state. When turned, the Tsuzumi wheel rotated, and its rotation was transmitted via the small iron wheel to the Hinohura wheel of the wheel train mechanism, and this Hinohura wheel attached the second wheel to which the minute hand was attached, and the hour hand. The hour wheel is rotated to adjust the hands. Due to manufacturing problems, it has recently been considered that the various gears used in such time adjustment mechanisms may be made of synthetic resin instead of metal. However, the time adjustment mechanism as described above,
In order to prevent the second hand and the step motor from rotating during time adjustment, a slip mechanism is provided on the second wheel of the gear train mechanism, and the slip mechanism is made to slip between the shaft portion of the second wheel and the gear portion. Therefore, when adjusting the time, it is necessary to turn the winding stem with a torque (rotational force) greater than the slip torque of the second wheel and pinion, which places a large load on the Tsuzumi wheel and small iron wheel. There is a problem that the car may be deformed or damaged. In particular, the tips of the teeth of the Tsuzumi wheel and the small iron wheel may collide with each other when adjusting the time, so the tips of the teeth are easily crushed, and the small iron wheel is constantly meshed with the gears of the wheel train mechanism, such as the Hinoura wheel, and rotates. Therefore, there is also the problem that if the small iron car is damaged, it will adversely affect the operation of the wheel train mechanism. [Purpose of the invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to prevent plastic deformation and breakage of the gears of the time adjustment mechanism even if they are made of synthetic resin. The object of the present invention is to provide a time adjustment mechanism for a pointer-type timepiece that allows a wheel train mechanism to operate satisfactorily. [Main points of the invention] In order to achieve the above-mentioned purpose, this invention consists of forming the Tsuzumi wheel and the modification wheel with which the Tsuzumi wheel engages with synthetic resin, and also using a resin material that is more flexible than the resin material of the modification vehicle. It was formed by [Example] Hereinafter, an example in which this invention is applied to an electronic wristwatch will be described with reference to FIGS. 1 to 3. Configuration Figures 1 and 2 show the analog movement of an electronic wristwatch. This ANAMUG movement transmits the rotation of the step motor 1 to the gear train mechanism 2, which moves the hour hand 3a, minute hand 3b, second hand 3c, etc. to indicate the time, and the time adjustment mechanism 4. It is designed to align the needles. The step motor 1 is a drive source for moving the hands, and is composed of a rotor 5, a stator (not shown), a coil, etc., and is configured such that the rotor 5 rotates in steps of 180 degrees each time a reversal pulse of a fixed period is applied to the coil. It's getting old. In this case, the rotor 5 consists of a rotor portion 5a, a rotor pinion 5b, a rotor shaft 5c, etc., as shown in FIG. It is configured with a ring 5d attached,
A rotor shaft 5c is rotatably attached between the base plate 6 and the gear train bridge 7. Note that the resin injection gate G of the rotor 5 is provided on the upper end surface of the rotor shaft 5c. The wheel train mechanism 2 transmits the rotation of the step motor 1 to the pointer to move the pointer. Consists of a car 13, etc., a main plate 6 and a gear train bridge 7
An intermediate wheel 8, a fourth wheel & pinion 9, and a third wheel & pinion 10 are installed between the main plate 6, and a center wheel & pinion 11, a hour wheel & pinion 12, and an hour wheel & pinion 13 are installed on the main plate 6, respectively. in this case,
The main plate 6 and the gear train bridge 7 are made of polyetherimide resin mixed with 40% glass filler, and a dial plate 14 is provided on the upper part of the main plate 6. Each car will be explained in turn below. The intermediate wheel 8 is the rotor pinion 5b of the step motor 1.
It is made of polyacetal resin with potassium titanate whiskers,
It is molded integrally with the shaft portion 8a and the intermediate pinion 8b, and the resin injection gate G is provided on the lower end surface of the shaft portion 8a. The fourth wheel 9 rotates by meshing with the intermediate pinion 8b of the intermediate wheel 8, and moves the second hand 3c, whose shaft portion 9a forms the second hand axis, and the bearing portion 6a of the main plate 6.
The second hand 3c protrudes upward through the dial plate 14, and this protruding portion serves as a hand attachment portion 9c, and the second hand 3c is attached to this hand attachment portion 9c. This fourth wheel 9 is made of polyetherimide resin mixed with 15% potassium titanate whiskers, and the shaft portion 9
a and the fourth kana 9b,
The resin injection gate G is provided on the lower end surface of the shaft portion 9a. Note that the base plate 6 through which the shaft portion 9a is inserted
The bearing portion 6a is formed sufficiently high so that the shaft portion 9a of the fourth wheel & pinion 9 does not run out. The third wheel 10 rotates by meshing with the fourth pinion 9b of the fourth wheel 9, and is made of polyacetal resin containing potassium titanate whiskers, and as shown in FIG. is formed integrally with. In this case, Sanbankana 10
b penetrates the base plate 6 and protrudes above it,
Further, the resin molding gate G is provided on the lower end surface of the shaft portion 10a. The second wheel 11 rotates by meshing with the third pinion 10b of the third wheel 10 to move the minute hand 3b, and the shaft portion 11a forms the minute hand axis and is rotatable around the outer periphery of the bearing portion 6a of the main plate 6. The upper end of the shaft portion 11a protrudes upward through the dial 14, and the minute hand 3b is attached to this protruding portion. This center wheel 11 is formed by integrally molding a shaft portion 11a having a cylindrical pinion portion 11b and a gear portion 11c in two colors so as to be able to rotate by slipping.
15 a contains potassium titanate whiskers which have high wear resistance and strength and have a higher melting temperature than the gear part 11c.
The gear part 11c is made of polyetherimide resin mixed with 12% of potassium titanate whiskers, and the gear part 11c has a small shrinkage rate and has a lower melting temperature than the shaft part 11a.
Made of nylon resin. As a result, the center wheel & pinion 11 has an appropriate stopping torque (36 g cm), and when a torque (load) higher than this is applied, the cylindrical pinion part 11b (shaft part 11a) and the gear part 11c mutually Slip rotation. In this case, the shaft portion 11a of the center wheel & pinion 11 has a cylindrical shape, and a cylindrical pinion portion 11b is formed at the lower portion thereof, and a pinion b is formed in this cylindrical pinion portion 11b. This pinion b engages with the hinoura wheel 12, and its tooth profile is an involute tooth profile. The hino-ura wheel 12 rotates by meshing with the pinion b formed on the cylindrical pinion portion 11b of the center wheel 11, and is made of polyacetal resin containing potassium titanate whiskers, and is integrated with the hino-ura pinion 12b. The shaft portion 6 is formed in a shape that protrudes from the upper surface of the base plate 6.
It is rotatably attached to c. in this case,
Since the pinion wheel 12 meshes with the pinion b of the center wheel and pinion 11, the tooth profile of its teeth 12c is the same involute tooth profile as the pinion b. The hour wheel 13 rotates by meshing with the pinion 12a of the hour wheel 12, and moves the hour hand 3a. It is made of polyacetal resin containing potassium titanate whiskers, and its shaft portion 13a is cylindrical. Rotatably mounted on the outer periphery of the shaft portion 11a of the car 11,
Its upper end protrudes above the dial 14, and this protruding portion serves as a hand attachment portion 13b, into which the hour hand 3a is attached by press fitting. In addition, Kana b of second wheel 11 and Hinoura car 12
Except for the teeth 12c, each of the other gears of the gear train mechanism 2 is formed into a cycloidal tooth profile. On the other hand, the time adjustment mechanism 4 for adjusting the hands, as shown in FIG. 2, includes a winding stem 17, a stopper wheel 18, a small iron wheel 19, a mandarin duck 20, a cannula 21, etc., and is provided on the main plate 6. That is, the winding stem 17 is slidably and rotatably provided on the base plate 6, and slides and rotates in response to the operation of a crown (not shown) protruding from the outside of the wristwatch case, and is made of metal or the like.
A guide portion 17a is located at the inner tip, a spline portion 17b is located to the right of the guide portion 17a, and a stepped recess 1 is located to the right of the guide portion 17a.
7c are provided in order. The guide portion 17a is slidably and rotatably inserted into the guide hole 6d of the base plate 6. The spline portion 17b is a portion to which the suspension wheel 18 is slidably attached, and a plurality of spline grooves are formed on the outer peripheral surface. The mandarin duck 20 is arranged in the step recess 17c,
The mandrel 20 restricts the position at which the winding stem 17 is pulled out. The tension wheel 18 meshes with the small iron wheel 19 when the winding stem 17 is pulled out and rotates when the winding stem 17 is rotated. It is made of polyetherimide resin, has a substantially cylindrical shape, and has a left end A crown tooth 18a is provided on the surface, and a recessed groove portion 18b is provided on the outer peripheral surface. In this case, the crown tooth 18a is formed into an involute tooth profile. In addition, a cannula 2 is provided in the groove portion 18b.
1 is arranged, and the winding stem 17 is
The Tsuzumi wheel 18 is slid in response to the pull-out operation. The small iron train 19 transmits the rotation of the Tsuzumi train 18 to the above-mentioned Hinoura train 12 of the wheel train mechanism 2.
A metal holding plate 22 is made of polyetherimide resin mixed with 30% potassium titanate whiskers and is rotatably attached to a shaft portion 6e formed protruding from the upper surface of the base plate 6. is being held down. In this case, since the small iron wheel 19 meshes with the tooth wheel 18 and the teeth 12c of the Hinoura wheel 12, its tooth profile is an involute tooth profile, and the pitch P ₁ on the tip circle of the small iron wheel 19 is involute.
As shown in FIG. 3A, the pitch P2 on the pitch circle is the same as the pitch p of the Tsuzumi wheel 18, and the pitch _P2 on the pitch circle is smaller than the pitch p of the Tsuzumi wheel 18. That is, the pitch P ₁ on the tooth tip circle of the small iron wheel 19 is 0.9 to 1.1 times the pitch p on the tooth tip of the tooth wheel 18 (P ₁ = 0.9 p to 1.1 p).
is set to . Therefore, as shown in FIG. 3b, even if the tips of the teeth of the knob wheel 18 collide with the tips of the teeth of the small iron wheel 19 during time adjustment, the small iron wheel 19 will break and the fitted state of the adjusting wheel 18 to the winding stem 17 will be changed. The small iron wheel 19 and the Tsuzumi wheel 18 rotate slightly due to the gap between them, so that they mesh smoothly. The strength differences between the time adjustment mechanism 4's Tsuzumi wheel 18, the small iron wheel 19, and the wheel train mechanism 2's Hinohura wheel 12 are as shown in Table 1 below.

【table】

[Table] Function Next, the operation of the analog movement configured as described above will be explained. Normally, a step motor 1 moves the hands to indicate and display the time. That is, as shown in FIG. 1, when the rotor 5 of the step motor 1 rotates,
The rotation is transmitted to the fourth wheel & pinion 9 via the intermediate wheel 8, and the fourth wheel & pinion 9 rotates to move the second hand 3c attached to the upper end of the shaft portion 9a of the fourth wheel & pinion 9. Further, when the fourth wheel & pinion 9 rotates in this manner, the rotation is transmitted to the center wheel & pinion 11 via the third wheel & pinion 10, and the center wheel & pinion 11 rotates. In this case, the shaft portion 11a and the gear portion 11c of the center wheel & pinion 11 are integrally formed so as to be able to slip and rotate.
1a and gear portion 11c rotate integrally. Therefore, the minute hand 3b attached to the shaft portion 11a of the center wheel & pinion 11 moves. When the center wheel 11 rotates in this manner, the rotation is transmitted to the hour wheel 13 via the hour wheel 12, and the hour wheel 13 rotates to move the hour hand 3a. In this manner, the hour hand 3a, minute hand 3b, and second hand 3c move above the dial 14, so that the time is indicated and displayed. Further, when adjusting the time, it is sufficient to pull the winding stem 17 of the time adjustment mechanism 4 shown in FIG. 2 and turn it by a predetermined amount. That is, when the winding stem 17 is pulled out in the direction of the arrow
7 in place. Then, mandarin duck 2
0 moves, the cannula 21 moves in the direction of the arrow Y, and the thread wheel 18 is moved to the spline portion 1 of the winding stem 17.
7b in the same direction, and the Tsuzumi wheel 18
The crown teeth 18a of are engaged with the small iron wheel 19. At this time, since the pitch P of the tooth portion 18a of the gear wheel 18 and the pitch _P1 at the tooth tip of the small iron wheel 19 are set to approximately the same width, that is, the pitch _P1 is set to 0.9p to 1.1p, each Even if the tips of the teeth collide with each other, the gear wheel 18 meshes smoothly with the small iron wheel 19 without damaging it. In this state, winding stem 17
When the wheel is turned, its rotation is transmitted to the small iron wheel 19 via the stopper wheel 18, and the rotation of the small iron wheel 19 is transmitted to the center wheel & pinion 11 and hour wheel 13 via the hour wheel 12. As a result, the center wheel 11 and hour wheel 13 rotate, and the hour hand 3a and minute hand 3b are moved to perform hand alignment. At this time, torque (rotational force) is applied to the center wheel & pinion 11 from the winding stem 17, but the torque (rotational force) from the winding stem 17 exceeds the slip torque (3 to 6 g cm) of the center wheel & pinion 11. When this occurs, a slip occurs between the shaft portion 11a and the gear portion 11c of the second wheel & pinion 11, and the shaft portion 11a slips and rotates. Therefore, the minute hand and hour hand can be set without rotating the second hand or the step motor 1. However, according to the time adjustment mechanism 4 of the Anamugu movement as described above, among the Tsuzumi wheel 18, the Kotetsu car 19, and the Hinoura wheel 12, the Tsuzumi wheel 18 is molded from polyetherimide resin, and the Hinoura wheel is made of polyetherimide resin. 12 is made of polyacetal resin containing potassium titanate whiskers, and the small iron car 19 between these is made of polyetherimide resin mixed with 30% potassium titanate whiskers. When the tooth tips of the tooth wheel 18 collide and rotate during time adjustment, the tooth wheel 18 absorbs the impact, and the teeth of the small iron wheel 19 are not deformed or damaged, making it reliable. In addition, the gears can be engaged smoothly, the rotation of the winding stem 17 can be reliably transmitted, the time can be adjusted well, and the wheel train mechanism 2 can be operated smoothly. In particular, although the small iron wheel 19 is always rotated by the wheel train mechanism 2, the wheel train 18 is not affected by the operation of the wheel train mechanism 2, so even if the wheel train 18 is deformed or has teeth missing, The operation of the wheel train mechanism 2 is not adversely affected. In addition, each car 18,
19, the teeth 12c of the pin wheel 12, and the pinion b of the second wheel & pinion 11 are made into involute tooth shapes, so even if molded with synthetic resin as described above,
Sufficient strength can be ensured and a product with excellent durability can be obtained. In the above-mentioned embodiment, polyetherimide resin is used for the Tsuzumi wheel 18, polyetherimide resin mixed with 30% potassium titanate whiskers is used for the small iron wheel 19, and polyacetal containing potassium titanate whiskers is used for the Hinoura wheel 12. Although resin is used, this invention is not limited to this, and other resins may be used as long as the small iron car 19 is a harder resin than the Tsuzumi car 18 and the Hinoura car 12. Further, as shown in FIG. 4, when the shape of the tooth wheel 18 is formed with a flat or rounded cut surface _18a1 on the ridgeline on the outer periphery of the tip, the sharp part of the tooth tip is cut off and the strength of the tooth tip is increased. . Furthermore, in the above-described embodiment, the small iron car 19 was used as the correction car, and the small iron car 19 transmitted the rotation of the Tsuzumi wheel 18 to the Hinoura wheel 12 of the wheel train mechanism 2, but this invention is not limited to this. The hour wheel 13 of the wheel train mechanism 2 or the cylindrical pinion portion 11b of the second wheel & pinion 11 may be directly rotated using another correction wheel. Furthermore, this invention is not limited to the above-mentioned electronic wristwatch, but can be widely applied to other pointer type watches. [Effects of the invention] As explained in detail above, according to the time adjustment mechanism of this invention, the Tsuzumi wheel and the adjustment wheel with which the Tsuzumi wheel meshes are made of synthetic resin, and the Tsuzumi wheel is made from the resin material of the adjustment wheel. Since it is made of a highly flexible resin material, the stress applied when adjusting the time can be absorbed by the adjustment wheel, allowing the adjustment wheel and correction wheel to mesh smoothly and well, while also preventing plastic deformation and breakage of the gear, ensuring durability. can be improved. Also, if a strong force is applied, the Tsuzumi wheel and the correction wheel will be deformed or damaged, but the correction wheel, which rotates with the hands during normal hand movement, will not be deformed or damaged, so the time cannot be corrected. However, it does not affect normal hand movement in any way.

[Brief explanation of the drawing]

Figures 1 to 4 show an example in which this invention is applied to an analog movement of an electronic wristwatch.
Figure 1 is a cross-sectional view of the main parts showing the wheel train mechanism, Figure 2 is a cross-sectional view of the main parts showing the time adjustment mechanism, Figure 3 is a diagram showing the meshing relationship between the Tsuzumi wheel and the small iron wheel, and Figure 4 is the Tsuzumi wheel. It is a figure showing a modification of . 2... Wheel train mechanism, 4... Time adjustment mechanism, 12...
...Hinoura car, 17...Makishin, 18...Tsuzumi car,
19...Small railway car.

Claims (1)

[Claims for Utility Model Registration] An operating member movable between at least a first position and a second position in the axial direction; a knob wheel that moves in the axial direction in conjunction with the movement and rotates integrally with the operating member when the operating member is rotated at the second position; a correction wheel that rotates and meshes with the adjustment wheel when the operating member is in the second position and transmits rotation of the adjustment wheel to the pointer when the operation member is rotated; The wheel is made of synthetic resin, and the adjustment wheel is made of a resin material that is more flexible than the resin material of the adjustment wheel.