CN87107949A - Synthetic resin pointer shaft device - Google Patents

Abstract

A device has a pointer shaft made of synthetic resin, the pointer shaft has a first pointer shaft part (9) and a second pointer shaft part (11), which has an insertion hole (a, e), the first pointer shaft part Insert this hole to turn. The first pointer shaft part is molded into a column shape with synthetic resin containing cellulose reinforcement (25). In the synthetic resin from which the first pointer shaft portion is made, the longitudinal axis of the cellulose pressurized material coincides with the longitudinal axis of the first pointer shaft.

Description

The present invention relates to a device with a pointer shaft made of synthetic resin on which the pointer is mounted.

U.S. Patent No. 3,979,901 discloses a typical conventional pointer shaft used in an analog electronic watch. The second wheel that turns the second pointer is rotatably supported on a main plate, while its shaft portion is rotatably mounted on the cylindrical shaft of the center wheel. In this device, the shaft portion of the second wheel must have a high strength because the second pointer has to withstand a large force when it is mounted on it. Thus, so far, the second wheel has been made of metal. In the second wheel made of metal, in order to contact the inner surface of the cylindrical shaft part on the center wheel, a section of the second wheel shaft part must be made into many protrusions, and in order to reduce the shaft of the second wheel The frictional resistance between the part and the inner surface of the cylindrical shaft part on the intermediate wheel must be lubricated on the protruding part. Protruding the protrusion on the shaft portion of the second wheel complicates the structure of the second wheel, thereby making processing troublesome and costly.

In recent years, the gears of watches have been made of synthetic resin. Therefore people try hard to make the axle portion of the second wheel of synthetic resin installation second hand by conventional processing method. However, since the diameter of the shaft portion is very small, when the pointer is press-fitted to the shaft portion, the shaft portion is sometimes deformed or damaged.

To this end, an object of the present invention is to provide a device with a synthetic resin pointer shaft which is simple to manufacture, has low friction when rotating smoothly, and has sufficient strength so that when the pointer is mounted on it, it will not be deformed or deformed. damage.

In order to achieve the above object of the present invention, a device is provided, which includes: a synthetic resin pointer shaft with a first pointer shaft part, the first pointer is installed on the first pointer shaft part and driven to rotate; made of synthetic resin A first pointer shaft part, synthetic resin containing fibrous reinforcement, the longitudinal axis of which is parallel to the longitudinal axis of the first pointer shaft part, and a second pointer shaft part, at the end of which a second pointer is mounted , the second pointer shaft part has an insertion hole for installing the first pointer shaft part.

In the above structure, since the longitudinal axis of the fibrous reinforcing material contained in the synthetic resin making the first pointer shaft part is aligned to coincide with the longitudinal axis of the first pointer shaft part, the first pointer shaft part has Sufficient strength so that when the pointer is mounted on the first pointer shaft, the first pointer shaft portion will not be deformed or damaged. Since the first pointer shaft part is made of synthetic resin, its friction force is reduced, so that the protruding part for reducing friction force can be eliminated, which simplifies the manufacture of the pointer shaft and is easy to produce.

1 is a longitudinal sectional view of an analog electronic watch with a synthetic resin pointer shaft according to the present invention;

Fig. 2 is a longitudinal sectional view of the pointer electronic watch shown in Fig. 1 when it is in another position;

Fig. 3 is a sectional view of the center wheel of the pointer electronic watch shown in Fig. 1;

Figures 4 and 5 represent a method of producing the center wheel shown in Figure 3;

Figure 6 represents a perspective view of the top of the center wheel shown in Figure 3;

Fig. 7 is the front view of the second wheel of the analog electronic watch shown in Fig. 1;

Figure 8 represents a method of producing the second wheel of the analog electronic watch shown in Figure 7;

Fig. 9 represents the direction of the fiber reinforced material in the shaft portion of the second wheel of the analog electronic watch shown in Fig. 7;

Fig. 10 shows the situation that the second pointer is installed on the second wheel of the analog electronic watch as shown in Fig. 7 .

Figures 1 and 2 show an analog mechanism for a battery powered wristwatch. The analog mechanism transmits the rotation of the stepping motor 1 to the gear train mechanism 2, thereby driving hands such as hour hand 3a, minute hand 3b and second hand 3c to indicate time. The pointer is adjusted by dialing mechanism 4.

The stepping motor 1 is the driving source for the rotation of the pointer, and it is composed of a rotor 5, a stator (not shown in the figure), a coil (not shown in the figure), and so on. Whenever a switching pulse of a predetermined period is applied to the coil, the rotor 5 rotates stepwise by 180°. As shown in FIG. 1, the rotor 5 has a rotor portion 5a, a rotor pinion 5b and a rotor shaft 5c which are made of polyacetal resin filled with potassium titanate whiskers, and a magnetic ring 5d is mounted on the rotor portion 5a. The rotor shaft 5c is rotatably installed between the main plate 6 and the support plate 7 . At the center of the top end surface of the rotor shaft 5c, there is an inlet G of the rotor 5 for filling resin.

The gear train mechanism 2 is used to transmit the rotation of the stepper motor 1 to the pointer to make it rotate. It has a fifth wheel 8, a second wheel 9, a third wheel 10, a center wheel 11, an intermediate wheel 12, an hour wheel 13, and so on. The fifth wheel 8 , the second wheel 9 and the third wheel 10 are arranged between the main plate 6 and the support plate 7 , while the central wheel 11 , the intermediate wheel 12 and the hour wheel 13 are mounted on the main plate 6 . The main splint 6 and the support plate 7 are made of polyphenylene sulfide resin (hereinafter referred to as PPS resin) with glass fiber or polyetherimide resin with glass fiber. There is a dial 14 on the main splint 6 .

The various wheels are described below.

The fifth wheel 8 is rotated by meshing with the rotor pinion 5b of the stepping motor 1, and is made of polyacetal resin with potassium titanate whiskers, integrally formed with the shaft portion 8a and the intermediate pinion 8b. In the middle of the lower end of the shaft portion 8a, there is an inlet G for filling resin.

The second wheel 9 is engaged with the intermediate pinion 8b on the fifth wheel 8 to rotate, so as to drive the second hand 3c. The shaft portion 9a of the second wheel 9 is used as a shaft for the second hand, and it protrudes upwards through the support portion 6a on the main plate 6 and the dial 14, and the second hand 3c is mounted on the protrusion of the shaft portion 9a. The second wheel 9 is made of liquid crystal polymer resin containing 30% potassium titanate whiskers. The shaft portion 9a is integrally formed with the second wheel pinion 9b and the second wheel gear 9d, as shown in FIG.

As shown in Figure 8, when the second wheel 9 was produced, the upper and lower metal molds 23 and 24 were used, and the liquid crystal polymer resin added with potassium titanate whiskers was injected from the inlet G, and the inlet G was on the metal mold 24, so as to be compatible with the metal mold 24. The middle of the lower end of the shaft portion 9a corresponds. Then, in the shaft portion 9a of the second wheel 9, the direction of the resin flow coincides with the longitudinal axis of the shaft portion 9a, so that the liquid crystal polymer resin forms an extended molecule in the resin flow direction, that is, the axial direction of the shaft portion 9a Chain structure, while the longitudinal axis of the potassium titanate whisker 25 is set in the resin flow direction, that is, the axial direction of the shaft portion 9a, as shown in FIG. 9 . The protrusion on the shaft part 9a protruding upward from the bearing part 6a of the main splint 6 is made into a straight column shape, and the pointer mounting seat 9c, which is thinner than the shaft part 9a, is located at the upper end of the upward protrusion of the shaft part 9a, As shown in Figure 10. The mounting fixture 3c ₁ for the second hand 3c is mounted on the pointer mounting base 9c. The upper side of the pointer mounting base 9c is made into a columnar guide portion 9c ₁ , while the lower side is made into a tapered portion 9c ₂ . The second hand 3c is made of metal, and the mounting fixture _3c1 is contained in an end of the second hand 3c. The mounting fixture 3c ₁ is cylindrical, and the guide chamfer (the surface of the guide chamfer) of the pointer mount 9c on the shaft 9a is processed at the lower end of the inner surface of the mounting fixture 3c ₁ . Thus, if the second hand 3c is mounted, the mounting fixture _3c1 of the second hand 3c is smoothly guided on the guide portion _{9c1 by the guide chamfer 3c2 .} When the mounting fixture 3c ₁ is further pressed downward, the mounting fixture 3c ₁ is then tightly mounted on the tapered portion 9c ₂ of the second hand mount 9c, so that the second hand 3c is mounted on the shaft portion 9a of the second wheel 9 up. The supporting part 6a of the main clamping plate 6 that installs the shaft part 9a is made sufficiently tall, and the shaft part 9a on the second wheel 9 just can not swing at the center like this.

The third wheel 10 rotates in engagement with the second pinion 9b on the center wheel 9, and is made of polymer resin with potassium titanate whiskers, and is formed with the shaft portion 10a and the third pinion 10b. into one, as shown in Figure 1. The third pinion shaft 10b protrudes upward through the main plate 6, and there is an inlet G for filling resin in the middle of the lower end of the shaft portion 10a.

The center wheel 11 rotates in mesh with the third wheel pinion 10b of the third wheel 10 to drive the minute hand 3b. A shaft portion 11 b serving as a minute hand shaft is rotatably mounted on the outer edge of the supporting portion 6 a of the main plate 6 . The upper end of the shaft portion 11a projects upward through the dial 14, and the minute hand 3b is mounted on the projected upper end of the shaft portion 11a. Center wheel 11 is to make with two color molding (two color molding), and cylindrical pinion shaft part 11b and gear part 11c are arranged on shaft part 11a, and gear part 11c slips and rotates on cylindrical pinion shaft part 11b. The shaft portion 11a is made of PPS resin added with potassium titanate whiskers, which has high abrasion resistance and strength, and has a higher melting temperature than the synthetic resin used to make the gear portion 11c. The gear portion 11c is made of 12 nylon resin added with potassium titanate whiskers, which has a smaller shrinkage rate and has a lower melting temperature than the synthetic resin used to make the shaft portion 11a.

The structure of the center wheel 11 is shown in FIG. 3, the shaft portion 11a is made into a cylindrical shape, and the cylindrical gear shaft portion 11b is at the lower part of the shaft portion 11a. The cylindrical pinion portion 11b has a large-diameter hole a and pinion b, and a protruding portion and an extension portion d are formed on its outer edge. The upper portion of the shaft portion 11a has a small-diameter hole e. Separate part f and pointer mount part g are made on the outer edge thereof. The large-diameter hole a of the cylindrical gear shaft part 11b is rotatably matched with the edge of the support part 6a on the main splint 6, and its downwardly extending extension part d is rotatably inserted into the annular groove 6b. The groove 6b is around the supporting portion 6a on the main splint 6, so that it is fixed firmly so that the shaft portion 11a will not swing at the center. The pinion b at the outer edge of the cylindrical pinion portion 11b meshes with the teeth 12c on the intermediate wheel 12, and the tooth profile is involute. A gear portion 11c is molded on the protruding portion c, and the protruding portion C is formed into a ring shape under the pinion shaft b. The outer edge of the protruding portion c has a sharp angle. The outer diameter C ₁ of the protruding end of the protruding portion C is about 2.1 mm, the thickness C ₂ thereof is about 0.3 mm, and the angle C ₃ of the protruding end is about 120°. The gear part 11C is molded on the protruding part C, and its outer diameter is about 3.4 mm. The downward protruding distance _t1 from the protruding part C is about 0.15 mm. ₂ is approximately 0.1mm. In this way, the center wheel 11 has a suitable slipping moment (3-5 g·cm). When a moment (load) larger than this is applied thereto, the cylindrical pinion portion 11b (shaft portion 11a ) slips on the gear portion 11c. The shaft portion 9a of the second wheel 9 is inserted into the small-diameter hole e at the upper portion of the shaft portion 11a. The diameter of the separation portion f on the outer edge of the shaft portion 11a is smaller than that of the shaft portion 11a. On the opposite side of the separated portion f is the pointer mount portion 13b of the cylindrical hour hand 13, and its clearance L is predetermined so that even if the mount portion 13b is deformed when the hour hand 3a is mounted, the mount portion 13b may not come into contact with the center wheel 11. The shaft portion 11a is in contact. The pointer mounting seat g at the upper end of the shaft portion 11a is a part for mounting the minute hand 3b.

In manufacturing this second wheel 11, metal molds 15 and 16 are used, as shown in FIGS. 4 and 5 . Metal molds 15, 16 are adjacent to each other in a rotary type automatic insert molding machine. As shown in FIG. 4, initially, the shaft portion 11a with the cylindrical pinion portion 11b is injection molded by a pair of upper and lower main metal molds 15 and 15. As shown in FIG. In this main injection molding, the resin shot used is PPS resin added with crystalline potassium titanate whiskers, which contains a few percent of silicone oil with a heat resistance of 250°C or higher. An inlet G for filling resin is located at each of two grooves _11a1 and _11a1 which are located at the upper end of the shaft portion 11a, as shown in FIG. After molding the shaft portion 11a in this way, it is removed from the main metal molds 15, 15 and placed in the upper and lower pair of secondary metal molds 16, 16. The secondary molding resin is fed from the resin filling inlet G located in the lower metal mold 16, thereby molding the gear portion 11c on the shaft portion 11a as in the main molding production. The resin used in the secondary molding is usually added with crystalline potassium titanate whisker 12 nylon resin, which contains a few percent of silicone oil with a heat resistance of 250°C or higher. The center wheel 11 manufactured as described above is then immersed in mineral oil at about 100°C for about 3 hours for annealing. In this case, the temperature of the mineral oil is preferably about 80% of the heat distortion temperature, and the annealing time is longer than 1 hour, so that the center wheel 11 as shown in FIG. 3 is produced.

The intermediate wheel 12 rotates in mesh with the pinion b provided on the cylindrical pinion portion 11b of the center wheel 11, and is made of polymer resin to which potassium titanate whiskers are added. The intermediate wheel 12 is integrally molded with the intermediate wheel pinion shaft 12b, and is rotatably mounted on the protruding shaft portion 6c on the upper surface of the main splint 6. In this case, since the teeth 12c of the intermediate wheel 12 mesh with the pinion shaft of the center wheel 11, the shape of each tooth 12c has the same involute as that of the pinion shaft b.

The hour wheel 13 rotates in mesh with the pinion 12b of the intermediate wheel 12 to drive the hour hand 3a. It is made of polymer resin with potassium titanate whiskers. Its shaft portion 13a is made into a cylindrical shape, and is rotatably mounted on the outer edge of the shaft portion 11a of the center wheel 11, protruding upward from the dial 14, and the upper end of the protrusion is used as a pointer mounting seat 13b. The hour hand 3a is fixed on the pointer mount 13b by pressing.

In the gear train mechanism, except for the pinion b of the central wheel 11 and the tooth 12c of the intermediate wheel 12, the tooth shapes of the rest of the gears are cycloidal.

The dialing mechanism 4 for adjusting the pointer has a winding stem 17, a clutch wheel 18, a dialing wheel 19, a pull bar 20, a clutch bar 21, etc., and it is positioned on the main splint 6, as shown in Figure 2.

More specifically, the winding stem 17 is on the main splint 6 , and the movement of a knob (not shown in the figure) protruding outward from the watch case drives the winding stem 17 to slide and rotate. Winding stem 17 is made of metal, and its inner end, together with guide portion 17a, is rack portion 17b on the right adjacent side of guide portion 17a, and the right adjacent edge of rack portion 17b is stepped groove portion 17c. The guide portion 17a is inserted into the guide hole 6d of the main plate 6 both rotatably and slidably. The clutch wheel 18 is slidably mounted on the rack portion 17b, and a plurality of rack grooves are formed on the outer edge thereof. The pull bar is located in the stepped groove 17c to limit the pull-out position of the winding stem.

The clutch wheel 18 is meshed with the setting wheel 19 by the action of pulling out the winding stem 17, and rotates by the rotation of the winding stem 17 simultaneously. The clutch wheel 18 is made of carbon fiber PPS resin, is cylindrical, and is connected together with the head tooth 18a at the left end and connected with the groove portion 18b on the outer edge. The number of teeth of the rod head teeth 18a is 7, and the tooth shape is an involute shape. The clutch lever 21 is located in the groove portion 18b and pulls the winding stem 17 to slide the clutch wheel 18 .

The setting wheel 19 transmits the rotation of the clutch wheel 18 to the intermediate wheel 12 of the gear train mechanism 2, which has been mentioned above; it uses a polymer that is softer than the clutch wheel 18 and the intermediate wheel 12 in terms of hardness made of resin. The setting wheel 19 is rotatably mounted on the shaft portion 6e protruding from the upper surface of the main plate 6, and the setting wheel 19 is positioned by a metal locator mounted on the top of the main plate 6. Because setting wheel 19 is meshed with both of clutch wheel 18 and intermediate wheel 12, so its profile is an involute, and it has 8 teeth altogether, and pitch circle diameter is 1360 microns, and mold is 170 microns.

The tooth 12c of the intermediate wheel 20 meshed with the setting wheel 19 has 20 teeth, the pitch circle diameter is 3400 microns, and the mold is 170 microns. The pinion b of the central wheel 11 meshed with the tooth 12c of the intermediate wheel 12 has 8 teeth, the pitch circle diameter is 1360 microns, and the mode is 170 microns.

The operation of the simulated motion constituted as described above will be described below.

The pointer is generally driven by the stepping motor 1 to indicate a certain time. More specifically, as shown in Figure 1, when the rotor 5 of the stepping motor 1 rotates, the rotation is transmitted to the second wheel 9 through the fifth wheel 8, and the rotation of the second wheel 9 drives the rotor mounted on the second wheel. The second hand 3c on the upper end of the shaft portion 9a of 9, when the second wheel 9 rotates as described above, its rotation is transmitted to the center wheel 11 through the third wheel 10, so it also rotates. On the center wheel 11, the shaft portion 11a and the gear portion 11c are connected to rotate with each other by slipping. In this case, however, the shaft portion 11a and the gear portion 11c are integrally rotated because the sun wheel 11 is not pressed by a load higher than a predetermined value. Then, the minute hand 3b mounted on the shaft portion 11a of the center wheel 11 is moved. When the center wheel 11 rotates, its motion is transmitted to the hour wheel 13 through the center wheel 11, and its rotation drives the hour hand 3a. Since the hour hand 3a, the minute hand 3b and the second hand 3c rotate on the dial 14, the time is indicated.

If the time is adjusted, the winding stem 17 of the setting mechanism 4 is pulled out and rotated by a predetermined amount. More specifically, when the winding stem 17 is pulled out in the direction of the arrow X, the pull bar located on the stepped groove portion 17c of the winding stem 17 moves together with the winding stem 17, thereby turning the The winding stem is adjusted to the predetermined position. Then, the clutch lever 21 moves in the direction of the arrow Y due to the movement of the gear lever 20, and the clutch wheel 18 moves in the same direction together with the rack portion 17b of the winding stem 17. The rod tooth 18a of the clutch wheel 18 is engaged with the setting wheel 19 . When the winding stem 17 rotates in this situation, its rotation is transmitted to the setting wheel 19 through the clutch wheel 18 , and its rotation is transmitted to the center wheel 11 and the hour wheel 13 through the intermediate wheel 12 . In this way, the center wheel 11 and the hour wheel 13 rotate to drive the hour hand 3a and the minute hand 3b to set the time. At this time, the moment (rotational force) from the winding stem 17 is applied to the center wheel 11 . When this moment is greater than the slip moment (3～6 g·cm) of the center wheel 11, the shaft part 11a on the center wheel 11 slips on the gear part 11c, and the shaft part 11a rotates on the gear part 11c with slipping. And, when shaft portion 11a rotates with slipping, a thin layer of silicon oil film is formed on the contact surface of shaft portion 11a and gear portion 11c, which can play the role of lubricant, thereby making shaft portion 11a smoothly Rotate with slip on the gear portion 11c. Thus, the minute hand 3b and the hour hand 3a can be adjusted without rotating the second hand 3c and the stepping motor 1 .

However, according to the sliding mechanism of the above-mentioned simulated movement, the shaft portion 11a and the gear portion 11c of the center wheel 11 on which the minute hand 3b is mounted are coupled to rotate with slipping each other. In this way, the rotation of the stepping motor 1 is generally transmitted to the pointer to move the pointer precisely. Also, if timing or correcting the time, the shaft portion 11a can rotate with slip on the gear portion 11c. Since the protruding portion c constricted toward its end edge is formed on the shaft portion 11a of the center wheel 11, and the gear portion 11c is molded on the protruding portion c, a stable sliding moment can be obtained in a simple structure, and the gear portion 11c can also be securely mounted on the shaft portion 11a. In this case, the shaft portion 11a has high wear resistance and high strength. It is made of PPS resin added with potassium titanate whiskers, which has a higher melting temperature than the synthetic resin used for the gear portion 11c. The gear portion 11c is made of nylon resin with potassium titanate whiskers 12, which has a small shrinkage rate and a lower melting point than the synthetic resin used to make the shaft portion 11a. Accordingly, a suitable sliding moment of about 3 to 6 g·cm can be obtained between the shaft portion 11a and the gear portion 11c. If this material is replaced, a sliding torque of 2 to 10 g·cm can be obtained. Since the shaft portion 11a and the gear portion 11c of the center wheel 11 are made of resin pellets, a few percent of silicone oil that can resist 250° C. or even higher temperatures is mixed in the resin pellets, therefore, when the temperature is higher than the predetermined value When torque is applied to the shaft portion 11a to rotate the shaft portion 11a on the gear portion 11c, a thin silicon oil film is formed at the contact point between the shaft portion 11a and the gear portion 11c. Since the film acts as a lubricant, the shaft portion 11a and the gear portion 11c can rotate smoothly. Since they are annealed after being soaked in mineral oil at about 100°C for about 3 hours after molding, the distribution of stress in the resin can be evenly spread out, and the water absorption capacity of the resin can be reduced to prevent the molded size from being caused by water absorption. changes to obtain high accuracy. Since the shaft portion 11a and the gear portion 11a of the center wheel 11 are automatically formed in a rotary type molding machine by two-color molding, it is highly productive and extremely easy to manufacture. When molding the shaft part 11a, since the two grooves _11a1 and _11a1 are all made on the upper end face of the shaft part 11a, and the inlet G for injecting resin is made in the grooves _11a1 and _11a1 , the resin can be evenly added into the metal mold, thereby precisely molding the shaft portion 11a. Since the extension part d is made at the lower end of the center wheel 11, and is rotatably inserted into the annular groove 6, which is opened around the outer edge of the supporting part 6a of the main clamping plate 6, even for molding the main plate when synthetic resin is used, When the clamping plate 6 obtains enough strength to increase the thickness of the main clamping plate 6, the whole simulated motion system does not need to increase the thickness. Meanwhile, the center wheel 11 is preferably supported by the supporting part 6b to eliminate the swing of its center. Since the separation portion f is located at the outer edge of the shaft portion 11a of the center wheel 11 to face the pointer mounting seat 13b of the hour wheel 13, the shaft portion 13a of the hour wheel 13, even when the hour hand 3a is mounted on the pointer mounting seat 13b of the hour wheel 13 And when it is deformed, it does not contact the shaft portion 11a of the center wheel 11, so that the center wheel 11 and the hour wheel 13 can rotate smoothly.

Among the wheels used in the gear train mechanism 2 in the above-mentioned simulated motion system, the rotor 5 installed between the main clamping plate 5 and the supporting plate 7, the fifth wheel 8, the second wheel 9 and the third wheel 10 are all in the The synthetic resin is uniformly charged during the molding, so that the dimension is accurate because the resin feeding inlet G is opened at the center of the end faces of the shaft portions 5a, 8a, 9a and 10a. In particular, since the second wheel 9 is molded by injecting liquid crystal polymer resin with potassium titanate whiskers from the resin filling inlet G (the inlet G is opened at the center of the lower surface of the shaft portion 9a), the resin is molded along the second wheel 9. The longitudinal axis of the shaft portion 9a flows, while the liquid crystal polymer forms its extended molecular chain structure in the direction of resin flow, that is, the axial direction. The potassium titanate whiskers added to liquid crystal polymers are very small, such as fibers with a diameter of 0.2-0.5 microns and a length of 10-20 microns. Thus, since the longitudinal axes of the whiskers are in the direction of resin flow, the axial strength of the shaft portion 9a is increased. Therefore, when the second hand 3c is mounted on the upper end of the shaft portion 9a of the second wheel 9, the shaft portion 9a is neither bent nor damaged, and the second hand 3c can be securely mounted. In this case, the shaft portion 9a of the second wheel 9 is formed in a straight cylindrical shape. This simple shape can be molded simply and easily. Since the pointer mounting seat 9c mounted on the upper end of the shaft portion 9a includes a guide portion 9c ₁ and a tapered portion 9c ₂ , the mounting fixture 3c ₁ can be mounted on the pointer mounting seat 9c when the mounting fixture 3c ₁ of the second hand 3c is mounted on the pointer mounting seat 9c. Guide section 9c ₁ for secure guidance. When it is inserted further, it can be firmly press-fitted onto the tapered portion _9c2 . In this way, the installation operation of the installation fixture _3c1 is very simple and easy. Moreover, since the inclined surface _3c2 is formed on the lower end of the inner surface of the pointer mounting seat _3c1 on the second hand 3c, the pointer mounting seat _3c1 can be very smoothly and well pressed onto the pointer mounting seat 9c of the shaft portion 9a without the need to The pointer mounting seat 3c ₁ on the outer edge surface of the shaft portion 9a of the second wheel 9 is blocked during installation.

In the above-mentioned embodiment, the second wheel is to use liquid crystal polymer resin as the resin material. However, the second round may also employ polyetherimide resin as the resin material. The reinforcing material is not limited to potassium titanate whiskers, such as glass fibers, carbon fibers, reduced potassium titanate whiskers, etc., as long as it contains fibers. As for the content, it can be determined according to the resin material and the shape of the pointer shaft.

In the above-described embodiments, the present invention is applied to the pointer shaft of the second hand. However, the invention is also applicable to the pointer axis of the minute hand.

The present invention is not limited to the pointer shaft of the pointer electronic watch, but is also applicable to the pointer shaft of the pointer stop watch and the pointer shaft of the pointer instrument.

Claims (14)

1. A device comprising: a pointer shaft having a first pointer shaft part on which a first pointer is mounted and driven to rotate; and a second pointer shaft part on which a second The pointer, the second pointer shaft part has an insertion hole into which the first pointer shaft part is inserted, and is characterized by: The first pointer shaft part is made of synthetic resin containing fibrous reinforcing material, and its longitudinal axis is arranged to be parallel to the longitudinal axis of the first pointer shaft part. 2. The device according to claim 1, wherein said first pointer shaft portion has a cylindrical shape and has a cylindrical surface in contact with an inner edge surface of the insertion hole of said second pointer shaft portion. 3. A device according to claim 1, wherein the resin material used for said first pointer shaft portion is a liquid crystal polymer. 4. The device according to claim 1, wherein the resin material of said first pointer shaft portion is polyetherimide resin. 5. A device according to claim 1, characterized in that the cellulose reinforcing material contained in the resin material used for said first pointer shaft portion is potassium titanate whisker. 6. A device according to claim 1, characterized in that the fiber reinforcing material contained in the resin material used for said first pointer shaft portion is reduced potassium titanate whisker. 7. A device according to claim 1, characterized in that the fiber reinforcement contained in the resin material used for said first pointer shaft portion is glass fiber. 8. A device according to claim 1, wherein said second pointer shaft is made of a synthetic resin. 9. The device according to claim 1, characterized in that: at one end of said first pointer shaft portion, there is a pointer mount, said pointer mount has a guide portion at its end, and a conical pressing portion adjacent to it. As for the mounting part, the hole of the above-mentioned first pointer shaft part is press-fitted into the tapered press-fitting part through the guide part. 10. A device according to claim 1, wherein an inlet for filling resin on said first pointer shaft is opened on the lower surface of said first pointer shaft portion. 11. Device according to claim 1, characterized in that said device is an analog electronic watch and said first and second hands indicate time. 12. The device according to claim 11, characterized in that said first hand is a second hand and said second hand is a minute hand. 13. The device according to claim 11, characterized in that said first pointer is a minute hand and said second pointer is an hour hand. 14. The device of claim 1, wherein said device is a stopwatch, said first and second hands indicating measured time.

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