JPS6246833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movement structure for a wristwatch. In recent years, in order to pursue better exterior designs, watches have been required to become smaller and thinner, and as a result, external operating members for adjusting the pointers have become necessary. The cross-sectional height position of a given reuse relative to the thickness of the watch has become extremely influential on the thinness of the outer case and the operability of the reuse. The question is whether you can get it close to the height of the board.
This has become an important point in designing watch movements.

FIG. 1 is a cross-sectional view of main parts showing the relationship between the gear train structure, pointer correction device, and exterior case used in a conventional wristwatch movement, and shows the corner 2a of the winding stem 2 where the reuse 1 is attached. The Tsuzumi wheel 7 is engaged with the . Further, when the reuse 1 is set at the pointer correction position, the small iron wheel 8 with which the suspension wheel 7 engages is moved by the action of the pointer correction switching mechanism.
is arranged on the dial 6 side with respect to the winding stem 2. Furthermore, it consists of a mandarin duck 3, a cannula 4, which are interlocked according to the axial stroke motion of the winding stem 2, and a back presser 5 for pressing these members and supporting the small iron car 8 and the Hinoura car 33. A pointer correction switching mechanism is also arranged on the dial 6 side with respect to the winding stem 2. However, in such a wheel train structure and a pointer correction device arrangement structure,
A cross-sectional space for arranging a back pusher 5 for supporting the small iron car 8 and the Hinoura car 33 on the dial 6 side;
A cross-sectional space is required for stacking and arranging the constituent members of the pointer correction switching mechanism including the mandrel 3, the cannula 4, the back presser 5, etc., and when the winding stem 2 is attached or removed, In order to be able to remove the mandarin dowel 3a engaged in the groove 2b of the winding stem 2b from the winding stem groove 2b, an appropriate gap must be secured between the mandarin dowel 3 and the dial 6. It is difficult to move the height position toward the dial 6 direction to the maximum extent possible. Therefore, if a watch movement is made thinner, the cross-sectional height of the winding stem will be too close to the back lid side in the direction opposite to the dial. As a result, in order to press-fit and hold the reuse pipe 14a necessary for the exterior structure, the horizontal hole remaining thickness A of the case body 14, the thickness of the packing 15, and the stepped portion 13a of the back cover 13 for positioning the core 16 are determined. If this dimension is ensured, a wasted space will be created between the top surface 20a of the gear train bridge 20 at the top of the watch movement and the bottom surface 13b of the back cover 13, making it difficult to efficiently arrange the watch movement. This means that it is not possible to make the watch case thinner. In addition, if the reuse position is too close to the back cover side, when reusing the watch to adjust the pointer while the watch is still on the wrist, it will be difficult to reuse the watch because the reuse is close to the arm. There is also the disadvantage of becoming Furthermore, from the standpoint of the exterior structure, since the amount of the slope of the back cover slope portion 13c is reduced, the watch visually looks thicker, which is not desirable in terms of exterior design.

The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional movement structure, and to improve the height position of the winding stem on which the crown is mounted, so that a height position of the crown that is advantageous for small and thin watches can be obtained. The objective is to provide a clock movement structure that allows the movement to be brought as close to the plate side as possible.

More specifically, the present invention provides a winding wheel that interlocks with the winding stem, and a small iron wheel that meshes with the winding stem on the side opposite to the dial direction with respect to the winding stem, that is, in the direction of the back cover. The small iron wheel is configured to mesh with a pointer correction transmission gear provided on the rotating shaft of the minute wheel located at the center of the clock, and a pointer correction switching mechanism consisting of a mandarin duck, a cannula, etc. is connected to the winding stem. It is characterized by being arranged on the back cover side.

Embodiments of the present invention will be described in detail below with reference to the drawings. Fig. 2 is a plan view showing the movement of the timepiece of the present invention, Fig. 3 is a cross-sectional view of main parts showing the relationship between the winding stem height and the gear train structure in Fig. 2 and the exterior case. FIG. 2 is a sectional view showing the structure of the pointer correction device between B ₁ and B ₂ in FIG. 2;

In this example, a small iron wheel 8 that meshes with the needle wheel 7 when correcting the pointer, and a pointer correction switching mechanism consisting of a mandarin pin 3, a cannula 4, and a back pusher 5 are connected to the dial 6 with respect to the winding stem 2 and the main plate 18. By arranging it on the opposite side, that is, on the back cover 13 side, the winding wheel 7 is brought closer to the dial 6 direction, and the height position of the winding stem 2 in the cross-sectional direction is moved as much as possible toward the dial 6 side. . The minute hand wheel 9 located in the center of the timepiece includes a rotating shaft 10 having a pinion (pinion) 10a, a pointer correction transmission gear 11 fixed to the rotating shaft 10, and a pointer correction transmission gear 11 provided between the gear 11 and the pinion 10a. The second gear 12 is slip-fitted into the tapered portion 10b and rotates together with the rotating shaft 10 during normal hand movement, and the small iron wheel 8 is directly connected to the pointer correction transmission gear 11. They mesh together. Further, the small iron car 8 is supported by a shaft 31a provided on a winding stem support spacer 31 formed of a synthetic resin, and the gear train bridge 20 restricts lag.

In addition, in plan view, the center axis of the winding stem 2 and the screw wheel 7,
The center of rotation of the small iron wheel 8 and the center of rotation of the minute hand wheel 9 provided with the pointer correction transmission gear 11 that meshes with the small iron wheel 8 are arranged so as to be aligned on a straight line.

A front gear train mechanism 19 is disposed approximately in the center of the main plate 18, and a gear train bridge 20 is connected to the minute wheel 9, third wheel 2, etc.
1, the fourth row 22, and the upper handle of the rotor 23 are pivotally supported. Further, the dredging portion 20b of the gear train bridge 20 includes:
A battery side pressure spring 25 for holding the battery 24 is fixed with a screw 26.

A step motor 27 composed of a coil 28, a stator 29, and a rotor 23 is arranged at a position opposite to the battery 24 with respect to the train wheel mechanism 19 in plan view. The step motor 27
is driven in response to a drive signal from the electronic circuit block 30, and rotation is transmitted from the rotor 23 to the front wheel train. In addition, the pointer correction switching mechanism consisting of a mandrel 3, a cannula 4, a back pusher 5, etc. that are linked according to the stroke operation of the winding stem 2 is opposite to the dial 6 with respect to the winding stem 2 and the main plate 18 in cross section. In other words, in the direction of the back cover 13, the coil 28 and the front gear train mechanism 19 are disposed while avoiding the coil 28 and the front gear train mechanism 19. The cross-sectional height of the mandarin duck 3 is set by a winding stem support spacer 31, and a cannula 4 and a back presser 5 are stacked above it. Note that the back presser 5 is stacked on the end portion 28b of the coil winding core 28a, and is fixed to the base plate 18 together with the coil 28 by a coil set screw 32.

In the above configuration, in the normal hand movement state, the rotational driving force from the rotor 23 is transmitted from the fourth wheel 22 → the third wheel 21 → the minute wheel 9 (more specifically, the second gear 1
2→rotating shaft 10 and pinion 10a)→hinoshi wheel (not shown)→hour wheel 34, and the hands are moved. On the other hand, when correcting the pointer, when the crown 1 is set at the pointer correction position and the crown 1 is rotated, the rotation transmitted from the winding stem 2 to the dial wheel 7 changes from the small iron wheel to the minute wheel 9 (more specifically, Pointer correction transmission gear 11 → rotating shaft 10 and pinion 10
a) → The signal is transmitted to the Hinoura wheel → the hour wheel 34, and the pointer correction is performed.

At this time, the spring arm portion 4a formed integrally with the canopy 4 comes into contact with the rotor pinion 23a and a braking force is applied, so that the rotation shaft 1 of the minute wheel 9
Since the fitting portion between the gear 0 and the second gear 12 slips, the transmission of rotation to the front gear train is prevented without damaging the gear train.

As described above, according to the configuration of the present invention, the pointer correction switching mechanism consisting of a small railway car, a mandarin duck, a cannula, etc., which was a constraint when setting the cross-sectional height position from the dial to the winding stem. By placing this on the back cover side with respect to the winding stem and dial,
Since the cross-sectional height position of the winding stem can be easily set closer to the dial, extra space is created between the top surface of the gear train bridge located at the top of the watch movement and the bottom surface of the back cover. Even without it, the necessary dimensions from the reuse position to the back lid are ensured sufficiently for the exterior structure, and it becomes possible to make the watch case thinner in response to the thinner watch movement. Furthermore, as a result of this, the amount of slope of the back cover can be increased, making it look thinner visually, which is extremely effective in terms of exterior design. Further, even when adjusting the hands while the watch is worn on the wrist, the reuse operation becomes easier because the reuse is not too close to the wrist. In addition, from a plan view, the small iron wheel is configured to directly mesh with the pointer correction transmission gear fixed to the rotating shaft of the minute hand wheel, so it is possible to place the small iron wheel closer to the center of the watch. This makes it possible to arrange the pointer correction device closer to the center of the timepiece movement, and it also becomes possible to reduce the planar size of the timepiece movement. As a result, it becomes possible to realize a so-called Hosobuchi type ultra-compact bracelet watch for women with an excellent design.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing the relationship between the gear train structure of a conventional timepiece movement, a pointer correction device, and an exterior case, FIG. 2 is a plan view showing a timepiece movement according to an embodiment of the present invention, and FIG. The figure is a sectional view of the main part showing the relationship between the winding stem height and the gear train structure in Fig. 2 and the exterior case, and Fig. 4 is a main part showing the structure of the pointer correction device between B ₁ and B ₂ in Fig. 2. Partial sectional view. 1... Reuse, 2... Winding stem 3... Mandarin duck,
4...Kanuki, 5...Back press, 6...Dial board,
7...Tsuzumi wheel, 8...Kotetsu car, 9...Minute wheel,
10... Rotating shaft, 11... Pointer correction transmission gear, 1
3... Back cover, 18... Main plate, 20... Gear train bridge,
31...Spacer for supporting winding stem.

Claims (1)

[Claims] 1. In a watch movement structure in which a pointer wheel such as a minute hand wheel is rotated via a small iron wheel that rotates in conjunction with the rotation of the winding stem during pointer correction, the pointer correction consists of the small iron wheel, a mandarin duck, a cannula, etc. A switching mechanism is disposed on the back cover side with respect to the winding stem, and a pointer correction transmission gear is fixedly provided on the rotating shaft of the minute wheel, and the small iron wheel is connected to the pointer correction transmission gear. A wristwatch movement structure characterized by being configured to directly engage with each other.