JPS6263884A - Manufacture of balance of main spring timer - Google Patents

Abstract

PURPOSE:To manufacture a balance with a high accuracy even in case of a mass production by working and forming integrally a balance staff and a pallet fork by using a steel material. CONSTITUTION:A diameter stepped part 2 and a small diameter stepped part 10 are worked and formed as one body with a balance staff 1 by using a steel material, and a pallet fork 3 which consists of pair of projecting parts 4, 4 and engaged and detached to and from an escape wheel 7 is formed on one side face of the diameter stepped part 2. In the small diameter stepped part 10, a balance 6 which has been formed separately is fixed, and it becomes a balance 8. In this way, no damage is generated as a case of a pallet fork pin which has been used heretofore, and also even in case of a mass production, a balance can be manufactured with a high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a spring timer.

Prior Art Conventionally, as shown in Fig. 1, the simple escapement of a wind-up timer had a single steel wire ankle pin 5.5 implanted in the balance wheel 6 fixed to the balance wheel 1. In most of them, the escapement was performed by engaging and disengaging the escape wheel 7 from the ankle pin 5.5 of the heaven. However, this type of pin structure has disadvantages that may cause the timer to stop due to bending or breakage of the pin during processing or when the timer is operating, and is not durable. This has the disadvantage that production efficiency is significantly lowered because the time adjustment work requires a high degree of skill to avoid damage to the pins.

In addition, as an alternative to the pin shape described above, for example, as in Japanese Utility Model Publication No. 53-33579N, [On the crown that performs the speed regulating action of the escape wheel, an anastomotic surface portion that engages and disengages from the escape wheel is attached to the crown axis. A plate-shaped regulating plate is provided at the center, which is formed vertically and horizontally symmetrically, and among these meshing surfaces, the escape wheel is controlled by the meshing surfaces that form a pair of left stones connected by the edges that do not interfere with the escape wheel. An escapement mechanism such as a timer that controls the speed at a constant speed has been proposed, but a simple escapement that controls time by engaging and disengaging the Tenfu and the escape wheel has been proposed. Even small dimensional errors such as the distance between the escape wheels, the pitch of the escape wheel's escape teeth, and the shape and dimensions of the pallet pallets can have a large effect on time accuracy, and can cause the timer to stop or run, so these must be highly accurate. requested. However, when the regulating plate is made of synthetic resin as in the conventional example, as is well known, synthetic resin shrinks and expands significantly due to temperature changes, and the larger the molded product, the higher the shrinkage and expansion rate. As a result, the speed regulating plate, which is shaped like a plate, deforms extremely greatly due to changes in temperature and causes dimensional variations, making it impossible to obtain stable accuracy and causing variations in time accuracy. Moreover, the problem was that the timer stopped and the running problem was likely to occur.

Furthermore, if the speed regulating plate is made of metal, there is a problem in that it is very difficult to precisely process the shape of the speed regulating plate, resulting in high costs.

Problems to be Solved by the Invention The present invention has been made in view of the above problem 1. To provide a method for manufacturing a mainspring timer with high accuracy even in mass production by fitting a balance wheel to the balance.

Means to solve problems The present invention will be explained below with reference to the drawings.

2nd [3rd degree, 4th figure is a plan view, a side view, and a perspective view of the lever, the lever, and the pallet formed integrally with the stem, and 5th figure is the main body 8 of the present invention and the escape wheel. 7, 1 is a stem, 2 is a radial stepped portion integral with the stem 1, and on one side of the radial stepped portion 2 is a pair of convex portions each having a semi-cylindrical tip. 4.4 are formed in parallel by press molding, milling, etc., and a pallet 3 is formed integrally with the balance stem 1. Note that the distance A (Fig. 2) between the semi-cylindrical meshing portions 9.9 at the tips of the convex portions 4.4 of the pallet pallets 3 that engage and disengage from the escape wheel 7, and the distance between the balance 1 and the meshing portions 9.9. Although the distance IB (Fig. 2) to the escape wheel 7 is set appropriately depending on the meshing relationship with the escape wheel 7, as mentioned above, it is a main part of the escapement, and a slight dimensional error will cause the escape wheel 7 to A highly accurate one is required, as this can lead to fatal defects for the timer, such as jamming between the lever and the pallet wheel 3, or the escape wheel 7 not running properly. Therefore, in the present invention, the convex portion 4.4 of the pallet ankle 3 and the end engagement portion 9 of the convex portion 4.4.
9 is formed in advance by press forming or milling of a steel material, and then shaving to obtain an optimal shape for higher precision.

Reference numeral 10 denotes a small diameter stepped portion formed at the lower part of the diameter stepped portion 2 integrally formed with the balance stem 1, into which the balance wheel 6 is fitted.

Next, the manufacturing procedure of the heaven 8 having the above structure will be explained.

First, a balance stem 1 and a pair of protrusions 4.4 whose tips are semi-cylindrical.
The ankle 3 and the small diameter stepped portion 10 consisting of the second to fourth
As shown in the figure, it is formed using a steel material by press forming, milling, etc. Next, the balance wheel 6 formed by a well-known manufacturing method is inserted into the small-diameter stepped portion 10 approximately at the center thereof, but the balance wheel 6 is fixed thereto to form the balance wheel 8.

In the above embodiment, the small-diameter stepped portion 10 is formed integrally with the balance stem 1, and the lever ring 6 is fitted therein, but the small-diameter stepped portion 10 is omitted and the small-diameter stepped portion 10 is directly press-fitted and secured to the balance stem 1. It's okay.

Effects of the Invention As described above, according to the present invention, a pair of convex portions each having a semi-cylindrical tip are formed by press molding or milling on one side of the diameter step portion 2 formed integrally with the stem 1. Because it replaces the conventional ankle pin, it has greater durability than the ankle pin structure, and there is no need to erect the ankle pin 5.5 on the balance wheel 6 as in the conventional case, reducing the number of parts. It has the effect of being reduced and making Tianfu manufacturing ideal for mass production. Further, a convex portion 4 is provided on one side of the diameter stepped portion 2.
4, which is easy and inexpensive to process, and the pair of protrusions 4.4 that replace the ankle pins are formed in advance by press molding or cutting with a milling cutter, etc., and then shaved. Since it has a shape that can be processed and molded, it has the excellent effect of obtaining a highly accurate reading and providing a timer with high time accuracy.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional escapement mechanism; FIG. 4 is a plan view, a side view, and a perspective view showing the balance of the present invention and the pallet formed integrally with the balance; FIG.
The figure is a perspective view showing the relationship between the Tenfu main body and the escape wheel. 1: Balance stem 2: Stepped portion 3: Ankle 4: Convex portion 6:
Balance wheel 7: Escape wheel 9: Semi-cylindrical meshing part

Claims (1)

[Claims] At the top of the mainspring timer, which consists of a balance wheel, a balance wheel, and an anchor that engages and disengages from the escape wheel, the balance having a diameter step in the middle is formed by forming or cutting steel material, and the diameter step is A method for manufacturing a balance wheel for a mainspring timer, characterized in that a pair of convex portions each having a semi-cylindrical tip are formed on one side surface, and the balance wheel is manufactured by fitting a balance wheel to the lower part of the diameter stepped portion. .