JPS58105082A - Wheel train mechanism for time piece - Google Patents

Abstract

PURPOSE:To promote standardization and combined use of parts with an easy construction of 2-hand movement wheel train permitting a stepped hand work at an interval of more than 2sec. by varying the gear ratio and the position of a slip section only with a minimized loss by devising the gear ratio and the position of the slip section in the conventional wheel train construction susceptible to a load. CONSTITUTION:Numeral 33 indicates a fourth wheel having a gear 33a with 60 teeth and a pinion 33b with 10 teeth is meshed with a third gear 34a. A rather big shaft 33e is provided at the bottom of the fourth pinion 33b with the central hole 35f of a minute wheel 35 as bearing. Numeral 34 indicates a third wheel and a spring section 34c is formed on the third gear 34a with 40 teeth to grasp a shaft 34d elastically, generating a fixed slip torque. A pinion 34b with 20 teeth is meshed with a minute gear 35a. Numeral 35 indicates a minute wheel having a gear 35a with 30 teeth and a minute hand is mounted at the tip thereof. The wheel train construction following the minute wheel 35 is the same as that in the past but different in the driving torque.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an analog quartz gear train mechanism, and more specifically, a watch with a second hand that performs 1-second steps: M nails;
The present invention relates to a wheel train mechanism for a timepiece that enhances the dual use of the wheel train with a two-hand watch that performs step movement at intervals of at least two seconds or more, and that minimizes deterioration in performance.

Conventionally, there have been analog electronic watches with a second hand that moves at one-second intervals, and two-hand analog electronic watches that move in steps at intervals of two seconds or more. It was extremely difficult to change only the ratio and convert to a two-hand movement train that moves the hands in steps of two seconds or more.

This is because when the gear ratio for 1-second hand movement is reduced to the gear ratio for 2-second or more hand movement, the rotational torque of each wheel train decreases in proportion to the decrease in gear ratio, and the resistance of the wheel train to the load increases. However, the power decreases and the clock tends to stop. In particular, when converting the gear ratio of the gear train to a two-hand watch with a hand movement interval of 2 seconds or more, the fourth wheel where the second hand is attached can be cut short, but the part where the second hand is attached can be cut short. Due to its structure, it has a thick shaft that uses the center hole of the minute wheel as a bearing, so it is particularly easy to bear the load resistance caused by bearing wear and oil deterioration in that part. Previously, it was necessary to increase the driving force of the wheel train by changing the motor or increasing power consumption to increase the motor's output, but this was a major impediment to improving the performance of the watch.

The present invention minimizes loss by devising the gear ratio and the position of the slip part of the conventional gear train structure, which can easily bear loads. By changing only the gear ratio and the position of the slip section, it is possible to easily configure a two-hand movement train that moves the hands in steps of 2 seconds or more, greatly promoting the standardization and universalization of watch parts. It is intended to.

The contents of the present invention will be explained in detail below.

FIG. 1 is a cross-sectional view of the analog quartz gear train mechanism of the seconds hand material and the seconds movement hand.

Figure 2 is a cross-sectional view of the gear train of a conventional two-hand analog quartz with 10-second movement.

FIG. 3 is a sectional view of the gear train mechanism of a two-hand analog quartz with 10-second movement according to the present invention.

In FIG. 1, a rotor 1 has a pinion 1α with six teeth and rotates 180° per second. 2 is the fifth wheel with 45 teeth.
The gear 2α having 15 teeth is engaged with the rotor pinion 1α, and the pinion 2h having 15 teeth is engaged with the fourth wheel e. 3 is a fourth wheel with a second hand attached to its tip 6c, and a gear 3 with 60 teeth.
A pinion 3b having six teeth is engaged with the fifth wheel & pinion 4.

Further, at the lower part of the fourth pinion 3b, there is provided a shaft portion 3e which uses the central hole 5f of the minute wheel 5 as a bearing and is somewhat thicker than the diameter of the needle attachment portion. 4 is a third wheel having a gear 4α having 45 teeth, and a pinion 4z having 6 teeth is engaged with the minute wheel 5. A minute wheel 5 has a minute hand attached to its tip 5c, and a minute gear 5a having 48 teeth and a spring portion 5d is elastically held between the shaft portion 5t and generates a constant slip torque. There is. 6 is the sun wheel, 7 is the hour wheel, 8 is the small iron transmission wheel, 9
is a small iron wheel with teeth 9α, and the teeth 9α move the winding stem pinion 10α formed on the winding stem 1° and the winding stem 1G to the second stage position 1
It is designed to engage in the position where it was, and the needle can be rotated in this state. Reference numeral 11 is a gear train bridge, 12 is a main plate, and 16 is a stator.The configuration from the rear wheel at 6 to the stator at 13 is the same as a general analog quartz, so a detailed explanation will be omitted.

In FIG. 2, the distance between the centers of the bearings in each wheel train is the same as in the first wheel train. A rotor 21 has a pinion 21α having 10 teeth and rotates 180° once every 10 seconds. 2
2 is the fifth wheel and the gear 22a with 20 teeth is the rotor pinion 21
The pinion 22h having 10 teeth is meshed with the fourth wheel & pinion 23. 23 is a gear 23 with a fourth wheel and 15 teeth.
A pinion 23h having six teeth is meshed with the fifth wheel & pinion 4. Further, a slightly thick shaft portion 23t is provided at the lower part of the fourth pinion 23h, and the center hole 5f of the minute wheel 5 serves as a bearing. The fifth wheel and pinion 4 onwards are exactly the same as the wheel train configuration shown in FIG. 1, so a detailed explanation will be omitted.

In FIG. 3, the distance between the centers of the bearings in each wheel train is the same as in FIG. 2 and in the same manner as in FIG. 1.

1 is the rotor, 2 is the fifth wheel, and these have exactly the same configuration as in Figure 1. 33 is the fourth wheel and gear 36 with 60 teeth.
α, and the pinion 33b with 10 teeth is the third gear 34α
They are engaged. Also, there is a minute wheel 3 at the bottom of the fourth kana 33b.
The center hole 35f of No. 5 is used as a bearing, and a slightly thicker detail 33g is provided.

34 is a fifth wheel, and a third gear 34α having 40 teeth is formed with a spring portion 34c, which elastically clamps the shaft portion 34d and generates a constant slip torque. Also, the pinion 34h with 20 teeth is the minute gear 351.
It meshes with Z. 35 is a minute wheel and gear 3 has 30 teeth.
5a, and a minute hand is attached to the tip 35h. The configuration of the wheel train h1# after the branch wheel 35 is exactly the same as that shown in FIG. 1, so a detailed explanation will be omitted.

Now, in the conventional wheel train structure shown in FIG. 2 and the wheel train structure according to the present invention shown in FIG. 3, the driving torque of the fifth wheel and the fourth wheel by the rotor is different. The driving force of the rotor 21 in FIG. 2 and the rotor 31 in FIG. The rotational torque of the wheel 22 is twice the driving torque of the rotor 21 due to its gear ratio, and
The zero rotation torque is three times the driving torque of the rotor 21.

The rotational torque of the fifth wheel & pinion 32 in FIG.

The main factors contributing to the load on the wheel train are increased frictional resistance due to wear and deterioration of the shaft and bearings, the moment of inertia of Φ1, and the lateral pressure generated by rotor drive. The greatest effect is the increase in frictional resistance between the shaft and bearing. According to experiments, this increase in frictional resistance occurs in all bearings without much difference, and increases in proportion to the thickness of the shaft. Therefore, in a general analog quartz that uses a reduction gear train, if the gear ratio of the gear train near the rotor is increased, the resistance to the frictional resistance of the gear train becomes stronger. The rotational torque of the fourth wheel & pinion 330 is 10 times larger than the rotational torque of the fourth wheel & pinion 23 having the wheel train structure shown in FIG. It can be said that the wheel train structure shown in FIG. 3 is less commercially available than the wheel train structure shown in FIG. 2. However, on the other hand, if the gear ratio of the fifth wheel 32° and the fourth type 33 is configured as shown in Fig. 3, the gear ratio from the fourth type 33 to the minute wheel 35 becomes smaller, and the diameter of the minute gear 35d becomes smaller. Minute gear 35 (it is difficult to form a spring part in the Z part) t, but the third pinion 34h
can be made large, and the third gear 34a can also be relatively large, making it relatively easy to form a spring portion in the third gear 34 (Z section).

As described above, the wheel train structure of the timepiece according to the present invention is a two-hand watch that performs step movement at intervals of 2 seconds or more, and the slip mechanism is formed on the third gear, and the gear ratio from the rotor to the fourth gear is adjusted. Since I made it the same as the clock of 1 second step luck, 1
Since the same wheel train structure as the second hand can be adopted relatively easily and without straining performance, it has a great effect on the standardization and common use of watch parts.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an analog quartz gear train mechanism with a second hand. Figure 2 is a cross-sectional view of a conventional two-hand analog quartz gear train mechanism with a 10-second movement. FIG. 3 is a sectional view of the gear train mechanism of a two-hand analog quartz with 10-second movement according to the present invention. 1.21.31... Rotor 2.22.32... Fifth wheel 3.23.33... Fourth type 4.24.34...・Fifth wheel 5.25, 35... Minute car 6... L's back wheel 7... Hour wheel 8... Small iron transmission wheel 9. ...Small railway car 10 ... Volume Stem 11 ... Gear train bridge 12 ... Base plate 13 ... Stator and above Applicant Co., Ltd. No. Niseikosha

Claims (1)

[Claims] In an analog electronic watch that has a battery, an electronic circuit, and a step motor, and moves the hands in steps at intervals of 2 seconds or more, the gear ratio from the rotor shaft of the step motor to the fourth gear is 1/30, and the fourth gear A wheel train mechanism for a watch characterized by a slip mechanism provided between the wheel and the minute wheel.