JPS6124659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clockwork timer using a mainspring as a driving source.

Conventionally, timers for electrical appliances such as toaster ovens have relatively short time settings and have simplified structures because they do not require much time precision. Wind-up timers equipped with a so-called simple escape mechanism are widely used. Traditionally, the head of these wind-up timers was composed of four parts: a metal head shaft, a weight, and a pair of ankle pins, but this configuration required a large number of parts, making it difficult to manufacture high-precision products. It was difficult to do so, and the productivity was extremely poor and it could not be provided at a low price.

Therefore, various configurations of heavens have been proposed to improve the above-mentioned drawbacks, as shown in FIG. 1A and B, for example. In A, the crown shaft 1 is made of resin, and a metal weight 3 into which a pair of metal ankle pins 2 are inserted is press-fitted and fixed to the resin crown shaft 1. In B, the crown shaft 4 and the ankle part 5 are made of resin. The balance body 6 is integrally molded with resin, and a metal weight 7 is press-fitted and fixed thereto. However, the former still requires a large number of parts, resulting in poor productivity, and the ankle pin 2 inserted into the weight part 3 is extremely thin, resulting in tilting, etc.
There is a drawback that the engagement relationship between the ankle pin 2 and the escape wheel connected to the gear system is impaired, and the expected precision cannot be obtained.In the latter case, since the ankle part 5 itself is made of resin, The molding accuracy, that is, dimensional stability, is poor, and it is easy to wear out after long-term use, lacking durability. Furthermore, when used in a slightly high temperature atmosphere, the ankle portion 5 thermally expands, causing the ankle portion to deteriorate. 5 and the escape wheel is damaged, which not only makes it impossible to obtain the expected accuracy, but also has the drawback that it can sometimes cause fatal failures of the timer, such as stopping the timer midway.

The present invention has been made in view of the above-mentioned drawbacks, and utilizes the molding method of synthetic resin composite materials that has been rapidly developing in recent years to produce a synthetic resin composite material in which an appropriate amount of metal particles are mixed into the synthetic resin material. This invention provides a crown characterized by integrally forming a crown shaft, a weight part, and an ankle part by melting and solidifying.

First, to explain the synthetic resin composite material that forms the base material of the Tenfu of the present invention, the synthetic resin composite material is made by mixing metal particles into a synthetic resin, and using the metal particles as an aggregate, the synthetic resin is melted and solidified using heat or a solvent. As such synthetic resins, for example, polyamide (nylon), polyacetal, etc., which can be melted by heat or solvent, may be used alone or in an appropriate mixture, and may be in the form of particles or powder. used. Next, various types of metal particles such as iron and steel can be used, and it is preferable to use particles of extremely small and uniform size. This is because the variation in particle size is large.
This is because after being formed into a tent, its center of gravity is not uniform and the escapement accuracy is reduced. Also,
The appropriate state of the synthetic resin composite material of the present invention is one in which approximately 50% by volume of metal particles are blended into the synthetic resin. This is because if the amount of synthetic resin is small, it will not be possible to completely surround the metal particles, which will reduce the strength of the synthetic resin composite material, and if the amount of synthetic resin is large, the metal particles will not be completely enclosed. It is not preferable because it cannot be used and the weight is also reduced.

Next, an embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 2, reference numerals 8 and 9 are a lower machine frame and an upper machine frame, respectively, which are supported at appropriate intervals.
An escape shaft 10 is supported by the upper and lower machine frames 9 and 8, and 11 and 12 are an escape wheel and a pinion fixed to the escape shaft 10, respectively, and the pinion 12 is connected to a gear system not shown. shall be taken as a thing.

T is Tenfu, which includes the Tenfu axis 13, the weight part 14, which will be described later.
It consists of an ankle part 15, and 13 is the upper and lower machine frame 9.
and the Tenfu axis supported by 8, 14 is the weight part, 1
5 is an ankle portion formed in a semicircular shape as shown in FIG. The ankle portion 15 is the third
As shown in FIG. 4, it has approximately circular tip portions 15a at both ends, and when these tip portions 15a engage and disengage from the escape wheel 11, a well-known escape action is performed, that is, the escape wheel 11 The function is to regulate the rotation of the motor at a constant speed and to cycle the timer. This tip 15a corresponds to the ankle pin of a conventional escapement, and 15b is a reinforcing ring for the tip 15a. And the Tianfu T, that is, the Tianfu axis 1
3. The weight part 14 and the ankle part 15 are formed from the synthetic resin composite material, that is, by mixing about 50% metal particles into the synthetic resin and melting and solidifying the synthetic resin using the metal particles as aggregate. It is.

As described above, in the present invention, the balance shaft, the weight part, and the pallet part are integrally formed of a synthetic resin composite material mixed with about 50% by volume of metal particles, which is dramatically superior to the conventional metal balance. It can be provided with high precision and at low cost. In addition, the ankle part of the Tenfu of the present invention has extremely high mechanical strength and excellent wear resistance compared to other conventional ankle parts made of a simple resin material. It is possible to obtain a highly reliable celestial position without the engagement relationship being damaged or the time accuracy being reduced. Furthermore, since the balance shaft, weight part, and pallet part are integrally formed, productivity is extremely high and it can be provided at a low price, which has effects not found in the past.

[Brief explanation of the drawing]

FIGS. 1A and 1B are exploded perspective views of conventional examples, and FIGS. 2 to 4 show embodiments of the present invention. FIG.
FIG. 3 is a plan view with the upper machine frame 9 of FIG. 2 removed, and FIG. 4 is a perspective view of the tower. 13... Tenfu axis, 14... Weight part, 15... Ankle part.

Claims (1)

[Claims] 1. A simple escapement characterized by a synthetic resin composite material in which approximately 50% by volume of metal particles are mixed into a synthetic resin, which is melted and solidified and molded to integrally form a crown shaft, a weight part, and an ankle part. How to make Tenfu Machine.