JP2526239Y2 - Mobile watch winding pull-out prevention structure - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention can be applied to portable watches such as watches and pocket watches. More specifically, in such a portable timepiece, for example, when pulling out the winding stem when adjusting the time, the present invention relates to a winding stem removal preventing structure for preventing the winding stem from slipping out.

[0002]

2. Description of the Related Art Conventionally, in a portable timepiece, as shown in FIG. 5, for example, a winding stem 2 is provided on a main plate 1 so as to be able to be pulled out and pushed in, and a head 3a of the mandrel 3 is engaged with a mandrel engaging portion 2a of the winding stem 2. Combine. While the mandrel 3 is rotatable around a mandrel shaft 4 on the main plate 1, the mandrel dowel 3 c protrudes from its foot 3 b and engages with the tip of the longitudinal spring portion 5 a of the back presser 5. Furthermore, mandarin duck 3
In the pressed state of the winding stem 2 as shown in the figure, the tail 3d
By inserting the tip of tweezers or the like into the concave portion 3e and pushing it down, the head 3a is raised and the winding stem 2 can be pulled out. Then, in order to repair the watch movement, for example, the winding stem 2 is pulled out when the watch movement is taken out of the watch case. On the other hand, back foot 5
Is attached to the base plate 1 with a screw 6, and the tip of the elastic piece portion 5b holds up the lifting of the mandarin duck 3.

In the above-mentioned portable timepiece, for example, when time is set, as is well known, the winding stem 2 is pulled out of the timepiece movement, and the mandrel 3 is rotated.
The knuckle 7 is turned in conjunction with the turning operation, and the pinion wheel 8 is moved in the direction indicated by the arrow in FIG. Then, the winding stem 2 is rotated to rotate the pinion wheel 8, and the rotation of the pinion wheel 8 is transmitted to a not-shown minute wheel (not shown) via a small iron wheel 9 to set the time.

[0004]

However, in the conventional portable timepiece described above, the edge of the mandarin duck head 3a has a droop, and the corner of the mandrel engaging portion 2a with which it engages also has a droop. When the time is set, if the winding stem 2 is pulled out strongly, the head 3a of the mandrel 3 escapes from the mandrel engaging portion 2a and rises, thereby causing a problem that the winding stem 2 is pulled out.

Therefore, an object of the present invention is to prevent the winding stem from coming out when the winding stem is strongly pulled out, for example, for time adjustment.

[0006]

For this reason, the anti-winding pull-out structure according to the present invention is, for example, as shown in the following embodiment shown in the drawings, from a mounting piece portion 15b of a holding member such as a back holding member 15 via a step portion 15c. After the base end is once raised, the tip is inclined downward to extend the elastic piece portion 15d, and the tip of the elastic piece portion 15d suppresses the lifting of the mandarin duck 13.
And the pull-out and push-in operation, the mandrel 13 is made rotatable, and the tail 13b of the mandrel 13 is pushed down in a state where the winding stem 11 is pushed, so that the head portion 13a rises and the winding stem 11 is pulled out. In the portable timepiece that enables the above, an enlarged portion 13g is formed in the foot portion 13e of the mandrel 13 so as not to overlap with the pressing member when pushing the winding stem 11 and to enter under the mounting piece portion 15b when pulled out. It is characterized by the following.

[0007]

According to the present invention, the winding stem 11 is pulled out, for example, when the time is adjusted. Then, mandarin duck 13
13g of the holding member enters under the attachment piece 15b of the holding member, and the attachment piece 15b restricts the inclination of the mandrel 13 to prevent the head 13a from coming off the winding stem 11.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a structure for preventing the winding stem from being pulled out of a portable timepiece according to an embodiment of the invention in a hand-operated state. Reference numeral 10 in the figure denotes a main plate. As is well known, the base plate 10 is inserted so that the winding stem 11 can be pulled out and pushed in from the outer periphery toward the center. In the figure, the winding stem 11 is in a pushed-in state, and as is well known, its head penetrates a watch case (not shown) and projects to the outside, and a crown (not shown) is attached to the tip of the head. Further, the winding stem 11 has a mandrel engaging portion 11a in a timepiece case, and a pinion wheel 12 is attached to an axial front end thereof. Tsuzumi wheel 12,
It is attached to the winding stem 11 integrally around the shaft and slidably in the axial direction. Then, the turning operation can be performed together with the pulling and pushing operation of the winding stem 11 having the crown.
The head 13a of the mandrel 13 engages with the mandrel engaging portion 11a of the winding stem 11.

As shown in FIG. 1, the mandarin duck 13 projects a mandrel dowel 13c on its tail 13b.
A recess 13d is provided at the tip of the tail 13b. In addition, foot 1
An enlarged portion 1 protrudes from the cannula dowel 13f and partially extends downward at the tip of the foot portion 13e.
3 g are provided. Then, the distal end of the long spring portion 15a of the back presser (presser member) 15 is engaged with the dowel dowel 13c, so that the dowel 13f is inserted into the guide slot 1 of the canker 16.
6a. Further, the mandrel 13 is rotatable about the mandrel shaft 10a. Also, in the state where the winding stem 11 is pushed in as shown in the drawing, when the tip of tweezers or the like is inserted into the concave portion 13d and the tail portion 13b is pushed down, the mandrel 13 tilts around the tilting fulcrum P shown by the chain line in FIG. The portion 13a is raised from the mandrel engaging portion 11a so that the winding stem 11 can be pulled out.

The back presser 15 is made of a plate material, and
5b, the spring 15a is extended, and the step 15
The elastic piece portion 15d is extended through "c". Then, it is positioned by the shaft 18 penetrating the mounting piece 15b and the screw 19
Attach to the main plate 10 with. As shown in FIG. 2, the elastic piece portion 15d has its base end (left end in the figure) once lifted and then its tip is inclined downward, and as shown in FIG. . When the winding stem 11 is pushed in as shown in the figure, the back presser 15 presses the mandarin 13 without overlapping the enlarged portion 13g of the mandrel 13. Kannuki 16
The main plate 1 is engaged with the pinion wheel 12 at its front end 16a and rotatable about a shaft 20 passing through the rear end 16b.
Attach to 0.

By the way, when the time is set, FIG.
As shown by the middle arrow A, the winding stem 11 is pulled out from the main plate 10. Then, the mandarin duck 13 rotates clockwise as shown by the arrow B, and as shown in FIG.
Get underneath. Therefore, at that time, tentatively,
Even if is pulled out with a very strong force, as shown in FIG. 4, the inclination of the mandrel 13 is regulated by the attachment piece portion 15 b so that the head portion 13 a does not come off from the mandrel engaging portion 11 a of the winding stem 11. Then, based on the rotation of the mandarin duck 13, the cannon 16 is rotated counterclockwise by the mandrel dowel 13 f, and the pinion wheel 12 is moved downward in the figure at the tip end 16 a, and as shown in FIG. Mesh with. Then, the winding stem 11 is rotated to rotate the pinwheel 12, and the rotation of the pinwheel 12 is transmitted to the Hino wheel 26 via a small iron wheel 25 to set the time.

[0012]

Therefore, according to the present invention, when the winding stem is pulled out, the enlarged portion is inserted under the mounting piece of the pressing member, thereby restricting the inclination of the mandarin duck and preventing the head from rising. Therefore, even if the winding stem is strongly pulled out, for example, when time is set, it is possible to prevent the head of the mandarin dolly from coming off the mandrel engaging portion of the winding stem and coming off the winding stem.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a mobile watch is pressed into a winding true in a winding true pull-out preventing structure according to an embodiment of the present invention.

FIG. 2 is an explanatory partial cross-sectional view showing a cross section of the back press in the winding true pull-out prevention structure from the mounting piece to the elastic piece.

FIG. 3 is a plan view showing the winding stem pull-out state of the winding stem pull-out preventing structure.

FIG. 4 is a sectional view of the winding stem pull-out preventing structure taken along the line II in FIG. 3;

FIG. 5 is a plan view showing a conventional winding timepiece pull-out preventing structure of a portable timepiece in a state where the winding time is pushed in;

[Explanation of symbols]

 11 Makinari 13 Mandarin duck 13a Head 13b Tail 13e Foot 13g Enlarged portion 15 Back holding (holding member) 15b Mounting piece 15c Step 15d Elastic piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A base end is once lifted up from a mounting piece portion of a holding member via a step portion, and then a distal end is inclined downward to extend an elastic piece portion, and the tip of the elastic piece portion suppresses the lifting of a mandarin duck. On the other hand, the head of the mandarin duck is engaged with the winding stem, and the mandrel is rotatable with the pull-out and pushing thereof, and the head is lifted up by pushing down the tail of the mandrel in the pushed state of the winding stem. In a mobile watch that allows pulling out the winding stem,
A winding true pull-out prevention structure for a portable timepiece, wherein an enlarged portion is formed in a foot portion of the mandrel so as not to overlap with the pressing member when the winding stem is pushed in and to enter under the mounting piece portion when pulled out.