JPH0239269Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a winding stem switching mechanism for a portable watch.

(Prior Art) In a portable watch, the day, week, and hour/minute hands are usually adjusted by pulling the winding stem one step and two steps.

To explain this using a general winding stem switching mechanism as shown in FIG. By pulling out the first and second steps in the order of c, it rotates clockwise in the figure, and by pulling out the first step, the convex portion 2c is moved to the concave portion 5b of the bar 5.
By moving from the recessed part 5b to the stepped part 5c by step-drawing, the lever 3 that follows the protrusion 2c with the spring piece 5e is rotated clockwise and counterclockwise in the figure, respectively, and its arm 5d is moved. The wheel 6 on the winding stem 4 engaged with the winding stem 4 is configured to slide into the calendar correction position and the pointer correction position.

In this way, the positioning of the wheel 6 is carried out by the bolt 5 which is displaced against the spring piece 5e, and the opening force of the spring piece 5e is extended by one step as shown by the broken line in FIG. Since it only brings about a slight linear change in proportion to the deflection of the spring piece 5e from the position (calendar correction position) to the normal push-in position and the two-stage pull position (pointer correction position),
If the expansion force of this spring piece 5e is weak, resistance such as friction between the bolt 5 and the movement frame or back presser, or meshing friction between the dial wheel 6 and the date/day adjustment wheel or small iron wheel may occur. As a result, when the winding wheel 6 is pulled up from the first stage to the second stage, the gear wheel 6 remains engaged with the date and day adjustment wheels, and especially when the winding stem is pushed in from the second stage pulled position. In this case, there is a problem that the wheel 6 does not return to its original position while meshing with the small iron wheel, and if the expansion force of the spring portion 5e is large, the bolt 5 itself and its related movement may be damaged. If the other members to be used are deformed or scraped, other inconveniences may occur.

(Purpose) The present invention was devised in view of these inconveniences, and its purpose is to provide a winding wheel with a simple structure that allows accurate positioning of the wheel at all times regardless of slight variations in spring tension. The purpose of the present invention is to provide a true switching device.

(Means for Achieving the Object) In other words, in order to achieve the object, the present invention provides a member that rotates in conjunction with the axial movement of the winding stem and slides the sheave wheel on the winding stem in the axial direction. In this mobile device, a U-shaped spring piece whose tip slides on a fixed guide part is integrally formed, and a protrusion is provided on the fixed guide part to lock the tip of the spring piece when it is bent. It's in the winding stem switching mechanism of a watch.

(Example) The details of the present invention will be explained below based on the illustrated example.

FIG. 1 shows an embodiment of the present invention, in which a dowel 2 pivotally supported by a bolt support dowel 1a on a movement frame 1 engages with a threading stem moderation ridge 3a of a dowel presser foot 3. It has a dowel 2a and a neck 2b that engages with the groove 4a of the winding stem 4, and when the winding stem 4 is pushed and pulled, it rotates like a click around the bolt support dowel 1a as a fulcrum, and at the same time winds. It is configured to position the stem 4 at each of its drawer positions.

On the other hand, the bolt 5, which is pivotally supported by the bolt support dowel 1b on the movement frame 1, has one side thereof in contact with the protrusion 2c of the dowel 2, and is in the push-in position.
Three step portions 5a, 5b, and 5c are formed to be rotatably positioned at the step-up position and the second step-up position, respectively, and the tip of the arm 5d extending toward the winding stem 4 engages with the hexagonal wheel 6. The wheel 6, which is slidably attached to the corner shaft of the winding stem 4, is moved in the outer circumferential direction in order to mesh with the date and day adjustment wheels (not shown) at the first-stage pull position, and when it is in the second-stage pull position. In position, it is configured to be moved toward the center so as to mesh with the small iron wheel 7.

By the way, movement frame 1 has bolt 5.
A guide wall 1c is provided to receive the tip protrusion 5f of the spring piece 5e extending in a U-shape from the other end, and the bolt 5 expands the spring piece 5e using the tip protrusion 5f in contact with the guide wall 1c as a point of effort. Due to the force, the stepped portion 5a,
5b, 5c on the protrusion 2 of the oshidori 2
In addition, a protrusion 1d is formed on the guide wall 1c, so that when the winding stem 4 is pulled out two steps, the bolt 5 is pushed by the protrusion 2c of the handle 2, causing the guide wall 1c to come into contact with the protrusion 2c, as shown in the figure. It is configured to lock the tip protrusion 5f of the spring piece 5e in a state of large rotation in the clockwise direction.

In the embodiment described above, in the normal state in which the winding stem 4 is pushed in (FIG. 2a), the tip protrusion 5f of the spring piece 5b touches the guide wall 1c of the movement frame 1.
The opening force applies a rotational force to the bolt 5 in the clockwise direction in the drawing, and the first stepped portion 5a is brought into contact with the protruding portion 2c of the rear stopper 2 in this rotational position. For this reason, the bolt 5 maintains a neutral posture, and the arm 5d positions the wheel 6 in a non-meshing position.

When the winding stem 4 is pulled up one step from this state (Fig. 2b), the dowel 2 engaged with the groove 4b rotates clockwise in the figure, and the winding stem moderation crest 3 of the dowel 2a
It engages with the next recess in a to lock the winding stem in that position. At the same time, the protrusion 2c is moved to the second stepped part (recessed part) 5b of the bolt 5, rotated clockwise in the figure, and the handwheel 6 is slid in the outer circumferential direction using the arm 5d. This is engaged with the day correction wheel on a day not shown.

In this case, since the tip protrusion 5f of the spring piece 5e moves slightly to the left on the guide wall 1c,
The biasing force against the bolt 5 hardly changes.

Next, when the winding stem 4 is further pulled up to correct the pointer (Fig. 2 c), the Oshidori 2 further rotates clockwise in the figure as a result of this, and its protrusion 2 c causes it to move to the third step. Push down 5c to rotate the bolt 5 significantly clockwise in the figure.

Due to this rotation, the tip protrusion 5f of the spring piece 5e slides on the guide wall 1c to the right in the figure and is locked to the protrusion 1d. For this reason, the spring piece 5 with a reduced effective length
e partially bends greatly and rotates the bolt 5 while accumulating a large expansion force inside.

Therefore, if you push in the winding stem 4 after adjusting the pointer,
As the lock 2 rotates counterclockwise in the figure, the bolt 5, which is released from its restraint by the protrusion 2c, moves toward the small iron train with a large opening force (solid line in Figure 4) stored in the spring piece 5e. 7 and returns the clutch wheel 6 to its original position (Fig. 2a).

(Effects) According to the present invention as described above, a U-shaped spring piece is integrally provided on the member for sliding the wheel, and a protrusion is provided on the fixed guide portion on which the spring piece slides. Since the tip of the spring piece is locked there, the effective length of the spring piece when the hexagonal wheel is engaged with other correction members can be adjusted even though only a slight change has been made to the structure. It can be made substantially shorter and the resulting greater spreading force can always return the wheel to the correct position.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a winding stem switching mechanism showing an embodiment of the present invention, Figs. 2 a to c are explanatory diagrams showing each operating state of the same mechanism, and Figs. 3 a to c show each operating state. FIG. 4 is a diagram showing the relationship between the winding stem position and the bolt return force. 1...Movement frame, 1c...Guide wall, 1
d... Protrusion, 2... Oshidori, 4... Winding stem, 5...
...Lock, 5e...Spring piece, 6...Tsuzumi wheel.

Claims (1)

[Scope of utility model registration request] A U-shaped spring piece whose tip slides on a fixed guide part is integrated into a member that rotates in conjunction with the axial movement of the winding stem and slides the wheel on the winding stem in the axial direction. A winding stem switching mechanism for a portable watch, characterized in that the fixed guide portion is provided with a protrusion that locks the tip of the spring piece when it is bent.