JPS5828226Y2 - Time switch pendulum structure - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a pendulum of a time switch used in an escapement control mechanism.

As shown in Fig. 1, a pendulum to be engaged with an escapement gear used in a conventional running escapement speed control mechanism is molded with a pendulum pin 13 and a rotating shaft 15 of synthetic resin. A pendulum has been proposed in which both the rotating shaft 15 and the pendulum pin 130 are press-fitted into through holes 41 and 42 formed in a metal pendulum plate 4.

The accuracy of the position of the pendulum pin and the interval between both pendulum pins in a time switch is the most important element for a time switch. 13 is integrally formed, and the pin base portion 14 is relatively thick, so the shrinkage rate of the synthetic resin during molding affects it, making it difficult to obtain dimensional accuracy, and furthermore, dimensional accuracy may vary due to temperature changes. There are drawbacks such as.

To describe the above phenomenon specifically, when only the rotating shaft is press-fitted into a metal pendulum plate as described above, a phenomenon occurs in which the pendulum pin moves due to changes over time and temperature.

When the rotating shaft and pendulum pin are both press-fitted into the pendulum plate, the pendulum pin may fall during or after press-fitting due to changes in the press-fitting margin of the pendulum pin due to shrinkage after molding or temperature changes. , the spacing between both pendulum pins changes, and the escapement governors using these pendulums have different governing speeds, resulting in variations in time accuracy, and the time display on the scale plate and the operating time of the time switch do not match. You will get a time switch.

The purpose of this invention is to make the temperature characteristics of a pendulum pin molded on a metal pendulum plate similar to that of a metal plate, and to reduce the influence of shrinkage mentioned above during molding, thereby reducing the positional deviation of the pendulum pin and creating a time switch with uniform time accuracy. The purpose is to propose the structure of a pendulum.

The feature of this invention is that when forming a rotating ring and a pendulum pin on a metal pendulum plate by outsert molding, curved runners are installed above and below the pendulum plate to connect the pendulum pin and the rotating shaft. The reason is that it is designed so that it can be inserted.

Below, the invention will be explained by means of illustrated embodiments.

In FIG. 2, the pendulum 1 is engaged with the escape gear 21 of the gear train 2 of the time switch through two pendulum pins 3.

The pendulum 1 has a metal pendulum plate 4, a rotation shaft 5 made of a synthetic resin material, and the two pendulum pins 3 made of a synthetic resin material. As shown in FIG. 3, a through hole 41 for the rotation shaft 5 and a through hole 42 for the two pendulum pins 3 are bored.

When installing the rotating shaft 5 and the two pendulum pins 3 on the pendulum plate 4, load the pendulum plate 4 into an outsert mold, inject synthetic resin, and then insert the rotating shaft 5 and the two pendulum pins. Outsert mold 3.

When injection molding a synthetic resin, a flow path is formed in the mold so that the pendulum pin 3 and the rotating shaft 5 are connected by a thin runner 11 with a strong bend, as shown in FIG.

By reducing the wall thickness of the runner 11 and pouring the synthetic resin into it, the shrinkage of the synthetic resin during molding can be reduced by reducing the thickness of the runner 110.
It is absorbed by the bending part, and since the runner 11 is thin, the tension caused by contraction acts on the pendulum pin 3.
It is less likely to change position or fall over.

Furthermore, since the runners 11 are formed above and below the pendulum plate 4, as shown in FIG.
Even if tension is applied to the pendulum pin 3 due to contraction of the runner, the pendulum bottle 3 will not tilt because the upper and lower runners 11 pull each other together.

Therefore, even if the runner 11 contracts or relaxes, the interval between the pendulum pins 30 will never change or play will occur, and the positional accuracy of each pendulum pin 3 will be extremely stable.

The strength with which the rotation shaft 5 and the pendulum pin 3 are fixed to the pendulum plate 4 is determined by
1 and 42 are filled with synthetic resin from which the rotating shaft 5 and the pendulum bottle 3 are formed, so that sufficient mechanical strength can be obtained.

When the pendulum pin 3 is formed on the pendulum plate 4 as described above, the pendulum pin 3 has a thinner wall thickness and is fixed to the metal pendulum plate 4 which has a larger volume than the pendulum pin 3. It approaches the temperature characteristics of the metal plate of pendulum plate 4,
The dimensional accuracy between both pendulum pins against temperature changes is guaranteed by the metal pendulum plate 4, which has better temperature characteristics than synthetic resin.

Therefore, a pendulum can be obtained in which the pendulum pin 3 does not suffer from shrinkage during molding or from deformation, displacement, or falling of the pendulum pin 3 due to temperature changes.

Since the present invention is configured as described above, the temperature characteristics of the pendulum are improved, the positional accuracy of the pendulum pin is stabilized, and the time accuracy of the time switch is improved.

Furthermore, a time switch pendulum can be obtained which has the advantage of eliminating the assembly process of press-fitting the pendulum pin and rotating shaft into the pendulum plate.

[Brief explanation of drawings]

Figure 1 shows an exploded perspective view of a conventional pendulum, a longitudinal side view, and
Fig. 2 is a plan view of the pendulum and escapement gear train of the time switch of the present invention, Fig. 3 is a plan view of the pendulum plate of the above, Fig. 4 is a perspective view of the pendulum of the above, and Fig. 5 is a plan view of the pendulum of the above. The longitudinal sectional view and FIG. 6 are plan views of the same pendulum. 1... Pendulum, 2... Gear train, 3.
13... Pendulum pin, 4... Pendulum plate, 5, 15... Rotating shaft, 11... Runner, 14... Pin Base part, 21... escapement gear, 41, 42... through hole.

Claims (1)

[Scope of utility model registration request] In a time switch pendulum in which a pendulum pin and a rotating shaft that engage with an escapement gear from a metal pendulum plate are integrally outsert-molded on the pendulum plate using synthetic resin, the pendulum pin and the rotating shaft are connected. A pendulum structure of a time switch in which curved runners are provided above and below the pendulum plate and sandwich the pendulum plate.