JPS6338104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for setting the number of drawable stages of a reuse fixed to a winding stem in a so-called switching mechanism.

The basic movement structures of current pointer display wristwatches include so-called plain watches that only display the time, and watches with additional functions suited for multi-purpose use, particularly calendar watches with date and weekday mechanisms. However, a calendar watch can be made by adding a calendar mechanism to a plain watch that does not have a calendar, so if the basic movements of plain watches and calendar watches are made common, mass production will be possible. In order to improve productivity, reduce costs and improve management.
It will be advantageous in terms of after-sales service in the market, and it will be possible to make inexpensive watches.

However, in attempting to standardize the basic movements of plain watches and calendar watches, a problem that has traditionally been a problem is how to set the number of drawers for the winding stem and reuse when operated externally.

In other words, the number of steps that can be pulled out of the winding stem and reuse of a plain watch is one step from the normal position to the hand turning position, but in the case of a watch with a calendar, one of the needs is to be able to quickly adjust the calendar. In addition to the needle turning position, the number of stages that the winding stem can be pulled out must be increased by one stage to provide a calendar fast-forward correction position.

For this reason, it was important to find an appropriate setting method for the one-step winding stem for plain watches and the two-step setting for calendar watches, in terms of standardizing the basic movements.

FIG. 1 shows a conventional example.

FIG. 1a is a partial plan view showing the switching mechanism of a calendar watch, and FIG. 1b is a plan view showing the back press shape of a plain watch.
is engaged with a shaft 4a of a mandarin duck 4 that rotates around a mandarin duck shaft 3 planted on the base plate 2.

Further, a spring wheel 5 is loosely fitted to the corner 1b of the four-sided cut at the tip of the winding stem 1, and a ring pin 6 planted in the main plate 2 is inserted into the central constriction 5a of the spring wheel 5. Head 7a of rotating cannula 7
is engaged.

In addition, a spring restraining shaped part 9b provided at the tip 9a of a spring part of a back presser 9 fixed to the main plate 2 with a screw 8 is pressed into contact with the mandarin pin 4b protruding on the side opposite to the main plate 2 of the mandarin pin 4. Determining the resting position of Mandarin Duck 4.

The spring-stopping shaped portion of the back presser 9 has a number of recesses 9b, 9 corresponding to the number of drawable steps required for the winding stem 1.
c, 9d, for example, in the case of a plain watch,
2 for the normal position and the needle turning position as shown in Figure 1b.
In contrast, the calendar watch shown in FIG. -ing

As described above, conventionally, the number of stages that can be reused and pulled out in the switching mechanism of a general plain watch and a watch with a calendar was set by the difference in the number of recesses in the spring-restricting shape part of the back pusher. By selectively using pushers and standardizing other components, the basic movement was standardized.

However, in the case of standardizing the basic movement by selecting the back presser, the back presser needs to undergo difficult processing such as bending, which increases the cost.Moreover, it requires maintenance of the mold for pressing the back presser. It is difficult, and it is difficult to achieve precision in the shape of the jump, etc.
It had various drawbacks.

The present invention is intended to eliminate the above-mentioned drawbacks, and its purpose is to provide a method for setting the number of reuse drawers that is high in productivity and at low cost. This is done using the leap-shaped part of the cannuck and the protruding part of the mandarin duck.For a clock with a calendar, use a mandarin duck with one protrusion, and for a plain clock, use a mandarin duck with two protrusions. It is characterized by

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 2 is a partial plan view showing the switching mechanism of the calendar timepiece according to the present invention. FIG. 3 is a partial plan view of the switching mechanism of the plain timepiece according to the present invention. In addition, in FIG. 2 and FIG. 3, parts indicated by the same numbers are the same.

First, the configuration of a switching mechanism of a calendar timepiece, which is a basic example of an embodiment of the present invention, will be explained with reference to FIG.

A head 23a of a flat mandrel 23 that rotates around a mandrel shaft 22 implanted in the main plate 21 is engaged with the concave groove 20a of the winding stem 20.

Further, in the axial direction of the winding stem 20, a quick correction air transmission wheel 24 made of synthetic resin is disposed near the center of the movement so as to be adjacent to the head 23a of the mandarin duck. The engagement relationship between the quick correction transmission air wheel 24 and the winding stem 20 is such that when the winding stem is in its normal position, it is in an uncoupled state (the quick correction transmission air can rotate freely by itself), and when the winding stem 20 is pulled one step. As a result, the Soroban bead-shaped portion 20b of the winding stem 20 enters the center hole of the quick-correction transmission wheel 24, and the quick-correction transmission wheel 24 rotates in conjunction with the rotation of the winding stem 20.

In addition, the quick correction transmission air wheel 24 is always meshed with the wheel train of the quick correction mechanism, which is a part of the calendar device (not shown) disposed on the back side of the movement, and the winding stem 2
If you pull 0 one step and rotate the reuse, winding stem 2
The rotational force is transmitted from 0 to the quick correction transmission wheel 24 and further to the quick correction mechanism (not shown), allowing quick correction of the calendar.

The movement of the cannula 25 when pulling the winding stem 20 one step from the normal position is such that a very slight convex portion 25a is provided at the part where it engages with the mandarin duck 23 in order to obtain a degree of tension in pulling the winding stem 20 one step. Therefore, by slightly moving the winding wheel 26 with the winding stem, the protrusion 23b provided on the mandarin duck 23 will go over the slight protrusion 25a of the cannula 25.
The rest position of the cannula 25 after the winding stem 20 is completely pulled out one step is the same as the normal position.

Also, regarding the moderation between each stage of the winding stem 20 and the positioning of the resting position of the mandarin duck 23, the main plate 21
The cannula 25, which rotates around a cannula pin 27 planted in the back, is provided with a jump control shaped part like that conventionally provided in the back pusher, and the concave parts 25b, 25c, and 25d forming each jump control shape part are used for moderation. Attach
The position of mandarin duck 23 is regulated.

The cannula 25 integrates a cannula spring 25e that operates a ratchet wheel 26 that is engaged with a corner 20c of a four-sided cut at the tip of the winding stem, and obtains the above-mentioned winding stem moderation force with the spring force of the cannula spring 25e.

The return spring 28a of the mandrel head 23a, which is lifted when the winding stem 20 is attached or removed, extends its arm from one end of the battery presser spring 28 that holds the battery 29 adjacent to the switching mechanism, taking into account the return force of the mandrel 23. A mandarin duck 23 is disposed near the mandarin duck shaft 22 so as to be in pressure contact with the mandarin duck shaft 22.

Next, FIG. 3 shows the structure when the calendar clock shown in FIG. 2 is changed to a plain clock.

With this structure, the number of steps that the winding stem 20 of a plain watch can be drawn out is only one step, and it is sufficient that the mandarin duck rests in the first and second steps of the switching mechanism steps of the calendar watch described in the previous section. In the mandarin duck 30, which is the simplest and easiest to make, another protrusion 30a is provided adjacent to the protrusion 30b similar to the case of a calendar watch, and this protrusion 30a
However, the concave portion 25c is the moderation position of the cannula,
25d, the protrusion 3
0a has the protrusion 30b, so the recess 2 at the moderation position
5b.

With this structure, like a calendar watch, by simply engaging one protrusion of the mandarin duck 30 with the cannula 25, when external force is applied to the mandarin duck protrusion 30a, the mandarin duck protrusion 30a
This eliminates the risk that the object will climb over the convex portion 25a of the cannula 25 and land on the sliding portion 25f between the 0th stage and the 1st stage of the cannula 25.

That is, when the mandarin duck 30 begins to rotate in response to an external force, the protrusion 30b of the mandarin duck comes into contact with the protrusion 25g of the jump-stopping shaped part of the cannula, which acts to soften the shock, and at the same time, the sliding part 25 of the cannula
This is to prevent it from entering f.

As described above, according to the present invention, by changing the shape of the mandarin duck, which is the simplest shape, the basic movement of a calendar watch and a plain watch can be made common, thereby creating a switching mechanism that is strong against external forces. In addition, it has great practical effects as a method of setting the number of reusable drawers with good productivity and low cost.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, Fig. 1a is a partial plan view of the switching mechanism of a calendar watch, Fig. 1b is a plan view showing the shape of the back of a plain watch, and Fig. 2 is a partial plan view of the switching mechanism of a calendar watch. FIG. 2 is a partial plan view of a switching mechanism of a calendar watch according to an embodiment of the invention. FIG. 3 is a partial plan view of a switching mechanism when the calendar watch shown in FIG. 2 is used as a plain watch. 1, 20... winding stem, 2, 21... main plate, 4, 23,
30... Mandarin duck, 23b, 30a, 30b... Protrusion, 7, 25... Kannuki, 25b, 25c, 25
d...Kanuki yakusei shape part, 9, 10...back pusher, 9
b, 9c, 9d, 10a, 10b...Back pusher spring restraining shape portion, 28...Battery pusher spring.

Claims (1)

[Claims] 1. In a switching mechanism using an external operating member of a wristwatch, the number of stages in which the external operating member can be pulled out is determined by a jump-control shaped part provided on the bar and a protruding part provided on the mandarin duck; in the case of a watch with a calendar, one protruding part A method for setting the number of drawer stages of a switching mechanism of a wristwatch, characterized in that a mandarin duck with a handle is used, and in the case of a plain watch, a mandarin duck with two protrusions is used.