JPH0619114Y2 - Electronic watch with small second hand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electronic timepiece with a small second hand, and more particularly to a wheel train structure thereof.

[Outline of device]

According to the present invention, in order to drive the small second hand in the train wheel structure of an electronic timepiece, two kana are arranged in a car that is deceleratingly rotated by the rotation of a rotor, and driving is performed in the train wheel of the hour and minute hands and the train wheel of the small second hand. By making it a source, the hand movement torque is stabilized.

[Conventional technology]

Conventionally, as shown in FIGS. 3 (A) and 3 (B), a rotor 1 having two 1a and 1b is used as a drive source, and the decelerating rotation is performed from the kana 1a to the fifth wheel 2 to drive the fourth wheel 3 and the third wheel. 4, the minute wheel 5 displays the minutes, and the minute wheel 5 decelerates via the minute wheel 6 to display the hour by the hour hand wheel 7. The driving force of the rotor 1 is decelerated from the pinion 1b. A train wheel structure having a configuration in which the seconds wheel 9 is used to display the seconds via the intermediate wheel 8 has been known.

[Problems to be solved by the invention]

However, in the conventional wheel train structure, since the rotor 1 which is a driving force is provided with two pinions as a drive source, the hand movement torque has no margin and causes a stop. In addition, since the reduction gear ratio is large when the deceleration is transmitted from the rotor 1 having a high rotation speed to the second wheel 9, it is necessary to provide the intermediate wheel 8.

In order to solve such a conventional problem, the present invention aims to reduce the load on the rotor and stabilize the hand movement torque without damaging the conventional train wheel structure.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is designed to measure the stability of the hand movement torque by providing the transmission wheel, which is decelerating the rotation of the rotor, with two pinions as a drive source.

[Action]

If the timepiece is constructed using the train wheel structure configured as described above, the driving force of the transmission vehicle that is deceleratingly rotated by the rotational speed of the rotor is larger than that of the rotor. The driving force of is also stable.
In addition, an intermediate wheel for deceleration was required between the rotor and the second wheel, but since the transmission vehicle that is the drive source slows down the rotation speed of the rotor, it is not necessary and the number of parts can be reduced. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 (A) and 1 (B), a rotor 1 that generates a driving force drives a fifth wheel & pinion 2 via a rotor pinion 1a. The fifth wheel & pinion 2 has a first pinion 2a and a second pinion 2b, and the driving force from the rotor 1 is transmitted to the fourth wheel & third wheel & pinion 4 via the first pinion 2a to decelerate and The car 5 is driven to display the minutes. Further, the hour wheel 7 is displayed by driving the hour wheel 7 by decelerating through the rear wheel 6 of the day. Then, the second wheel 9 is driven through the second pinion 2b arranged on the fifth wheel 2 to display the second.

In this way, in the case of implementation, it is possible to drive the wheel train for the hour and minute display and the wheel train for the second display via the fifth wheel 2 in two. FIG. 2 is a plan view of this embodiment.

The present invention is not limited to this embodiment, and is a fifth wheel 2
It goes without saying that the first pinion 2a and the second pinion 2b can be divided into two parts with the same tooth profile.

[Effect of device]

As described above, the present invention uses a transmission vehicle other than the rotor, which has a stable driving force, as a drive source, and thus, in a structure with a large load that is divided into an hour / minute hand wheel train and a small second hand wheel train, Has the effect of measuring stability.

Further, since the tooth shape of the second kana can be arbitrarily selected irrespective of the tooth shape of the first kana, there is also an effect that the position of the second hand which is the mounting position of the small second hand can be determined according to the design requirements.

[Brief description of drawings]

1 (A) and 1 (B) are sectional views showing an embodiment of a train wheel structure according to the present invention, FIG. 2 is a plan view, and FIGS. 3 (A) and 3 (B) are conventional examples. A sectional view and FIG. 4 are plan views showing a conventional example. 1 ... Rotor, 1a ... Rotor, 1b ... Rotor, 2 ... Fifth wheel 2a ... First, 2b ... Second, 3 ... Fourth wheel, 4 ... Third wheel, 5 ... … Minute wheel, 6 …… Back wheel of the day 7 …… Hour hand wheel, 8 …… Intermediate wheel 9 …… Second hand, 10 …… Minute hand 11 …… Hour hand, 12 …… Second hand

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takayo Inoue 6-31-1, Kameido, Koto-ku, Tokyo Seiko Denshi Kogyo Co., Ltd. (56) Reference JP-A-59-122992 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An electronic timepiece with a small second hand, which has a rotor and a plurality of transmission wheels that are arranged between a minute wheel and a decelerating rotation, wherein one of the plurality of transmission wheels meshes with a gear for driving an hour and minute hands. An electronic timepiece with a small second hand, which has a kana and a second pinion for driving the small second hand.