JPS637907Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a structure that realizes a switching mechanism for small watches such as women's watches at low cost.The invention provides a click part on the winding stem, which is an external operating member, and allows positioning of the winding stem with a small number of parts. This relates to improvements to the structure that generates the click force.

Conventionally, the most common mechanism for setting the hands of a clock has been to put a wheel in a winding stem with a corner, which is operated by a push-pull or bolt to engage a small iron wheel. There are disadvantages such as a large number of points and high cost.In order to improve this, a click part is provided on the winding stem, a spring member is applied here to position the winding stem, and the winding stem is attached at the tip of the winding stem. The structure that meshes the true iron with the crank gear installed on Kotetsu cars and Hinura cars was created in 1977.
It is publicly known as 25751 etc. However, as shown in this example, since the spring member 2 that elastically contacts the click part of the winding stem is a flat plate bent in the L direction, variations in the bending position directly result in variations in the position of the winding stem. If you use the tip of the winding stem to operate the adjustment lever, there is a risk that the adjustment lever may become misaligned, causing the adjustment to stop during normal operation. There are drawbacks such as the impact from the winding stem passing through the L-bent part of the spring member and causing it to break easily, and the L-bending part getting tangled with other parts during assembly and handling of parts, making it easy to break. When inserting the winding stem into the machine, all corner parts of the winding stem, including the central part of the winding stem, until the winding stem passes through the spring member and is assembled into position, must be made sloped. Otherwise, the end of the spring member will be sloped. Since there is no one, it causes interference and cannot be installed. For this reason, adding a slope results in the winding stem becoming longer, and the space around the winding stem becomes larger because the tip of the winding stem must be supported by a bearing, which has disadvantages such as making it difficult to downsize the watch. It was a lot.

The present invention aims to eliminate the above-mentioned drawbacks and realize a small and low-cost switching mechanism, and an embodiment thereof will be explained with reference to the drawings. In FIGS. 1 to 3, which are cross-sectional views of the embodiment, the winding stem 1, which is an external operating member, has a click portion 1e, a pinion portion 1f, a shaft portion 1g, and a collar for positioning the winding stem 1 in a plurality of positions in the axial direction. It has a shaft portion 1h, the shaft portion of which is engaged with the guide pipe 2, and the collar portion 1h that is in contact with the end surface of the guide pipe. The guide pipe 2 is connected to the main plate 6 as shown in FIG.
and the catch plate 7, and the base plate 6a, 6b is held with tightness by the cover plate parts 7a and 7b of the catch plate.
It is fixed between. The direction of rotation of the guide pipe 2 is determined by the cut portion 2c of the collar 2a of the pipe being held down by the stepped portion 7c of the seat, and the axial direction is determined by the insertion of the collar 2a into the square hole 6b of the base plate. The click plate 8 inserted into the hole 7d of the catch seat 7 has a slope 8a on a part thereof, and the upper surface is moved by an elastic click spring 15 to the chevron-shaped slope 1 of the winding stem click part.
a to determine the first stage winding stem position, which is the normal position. When the winding stem is pulled out to the second position, slope 1
b is pressed by a click plate to maintain the needle alignment position. The slope 8a of the click plate is for inserting the winding stem into the watch body, without having to lift the click plate, just by pushing the winding stem into the correct position.
The slope length is obtained by making the plate relatively thick. Third
As shown in the figure, the click plate 8 has a pry-up portion 8b and a hook portion 8c for hooking onto a corner of the catch seat 7. The hour wheel 9, which is a pointer correction wheel with a crown gear 9a that meshes with the pinion 1f on the second stage of the winding stem, is the spur gear 9b and the second pinion 10a of the second wheel 10, and the hour wheel pinion 9c is the hour wheel. It is engaged with 11. Although the second gear 10b is not shown, it meshes with other clock train wheels and transmits rotational force to the pointer display wheel. The upper tenons of the hour wheel 9 and second wheel 10 are supported by a gear train bridge 12, and the lower tenons are supported by a main plate 6. Reference numeral 13 denotes a circuit board, and 14 a circuit holding plate for holding the circuit board, which is positioned by engaging the hole of the click spring 15 in the burring portion 14a.
A regulating lever 17 in contact with the tip of the winding stem operates whenever the winding stem is pulled out, and has a regulating portion (not shown) regulating a part of the watch wheel train.

To explain the operation, when the winding stem is pulled out from the normal position shown in FIG. te2
The winding stem hub 1f meshes with the crown gear 9a of the hour wheel, and when the winding stem is turned, the rotational force is applied to the second needle 10a with the minute hand and the hour wheel 11 with the clock. It is transmitted and needle alignment is possible. In addition, when machining the winding stem pinion 1f, the outer diameter of the cutter hits the winding stem shaft portion 1g and is slightly toothed, but the overall length of the winding stem is shortened as the winding stem tip is not bearing. Therefore, the aim is to make the shaft portion 1g as long as possible to obtain more stable engagement.

The slope of the click plate 8 can be utilized when inserting the winding stem in order to improve the guideability of the winding stem with the guide pipe by minimizing the slope of the winding stem.

To remove the winding stem from the watch body, pry up the click plate part 8b using a screwdriver 16, etc., as shown in Figure 3.
Just pry up and pull out the winding stem. At this time, pry the click board upwards and then press it horizontally.
If the hook portion 8c is hooked onto the corner portion of the catch seat 7, the click plate will be locked at that position, making it easier to remove the winding stem. In addition to prying up the click plate, it is possible to remove it by pushing it up from the opposite side through a hole, and the hook portion 8c may be hooked onto another member other than the catch, such as a part of a click spring.

The click plate of the winding stem is pressed against the slope 1a of the click part, and the winding stem is pulled into the inside of the watch body by the component force, and the collar part 1h of the winding stem comes into contact with the end surface of the guide pipe 2 to reach the first stage position. Since the winding stem is configured to be fixed, the position in the winding stem axis direction can be accurately determined without being affected by play between the click plate and the catch, variations in the shape of the winding stem click part, etc. Therefore, variations in the position of the regulating lever 17 are suppressed, and the winding stem and crown gear 9
Since the axial clearance with respect to a is also maintained accurately, it is advantageous for small ladies' watches and the like where space is limited.

As described above, according to the present invention, compared to the conventional technique in which the spring member is bent L and applied to the click part, the spring member is divided into two parts, the click plate and the click spring, and the click plate is provided with a slope. As a result, there is no need to provide a slope on the external operating member.
Furthermore, even without operating the click plate, due to the effect of the slope of the click plate, the external operating member can be stably assembled into the watch body by simply pushing it into the watch body without bumping, and a plurality of stepped portions are formed. The total length of the external operating member can be shortened by the dimension that eliminates the slope of each step or reduces the slope of each step. Since the length of the contact part can be secured by the dimension that eliminates the slope of this part, the external operating member can slide stably. It is possible to avoid a structure in which the tip of the external operating member, which has become elongated, must be held, and the space efficiency around the external operating member is improved, which is particularly advantageous for small ladies' watches where space is limited. It has the effect of Furthermore, by forming a pry-up part and a hook part on the click plate, when removing the external operating member from the watch body, pry up the pry-up part with a screwdriver or the like, and then press the pry-up part in a horizontal direction. Since the hook portion can be hooked onto the corner portion of the catch and the click plate can be locked at that position, there is also the effect that the operability of removal when disassembling and assembling the external operating member becomes extremely easy.

Furthermore, since the click plate and the click spring are divided into two parts, the click spring can be formed into a relatively simple and flat single plate, which is advantageous in terms of manufacturing and assembly, and ensures stable spring properties. This has the effect that the variation in click force is also extremely small.

Furthermore, the entire timepiece can be made compact, has excellent operability, is compact, and can be manufactured at low cost. It should be noted that, as mentioned above, the structure for lifting the click board may naturally be applied to other structures such as pushing or prying up another member hooked to the click board, but this does not deviate from the aim of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. Second
The figure is a partial sectional view showing the fixing structure of the winding stem guide pipe. FIG. 3 is a sectional view showing a portion of the click board. 1... winding stem, 2... guide pipe, 6... main plate, 7... catch seat, 8... click plate, 15... click spring.

Claims (1)

[Scope of utility model registration request] an external operating member 1 formed with a plurality of steps having click parts 1e for positioning at a plurality of axial positions; a guide pipe 2 to which the external operating member 1 is rotatably fitted; Click part 1
a click plate 8 that engages with e to position the external operating member 1 and provides a click feeling during operation;
and a catch seat 7 for positioning the click plate 8,
a click spring 15 disposed above the click plate 8 and having elasticity for pressing the click plate 8 against the external operating member 1;
A screwdriver or the like is inserted between the slope 8a formed at the end corresponding to the direction in which the external operating member 1 is pushed into the watch body and another member close to one end of the external operating member 1 in the direction perpendicular to the axial direction. The external operation member 1 is formed to protrude so as to have an appropriate plane gap into which the pry-up operation member can fit, and a step in the cross-sectional direction.
a pry-up portion 8b for extracting the watch from the watch body;
At the other end in the direction opposite to the pry-up portion 8b, a part of the click plate 8 is hooked onto a part of another member or a part of the catch seat 7 at a position where the click plate 8 is pried up from the normal operating position. A switching mechanism for a watch, characterized in that it has a hook part 8c.