JPS63300993A - Mechanism for correcting hand of wrist watch - Google Patents

Abstract

PURPOSE:To facilitate hand correction and to forbid the generation of a deviated indication by changing the spring force in the spring part of a third wheel and pinion supporting lever at the time of hand correction and at the time of ordinary wearing. CONSTITUTION:The pressurized contact of an actuating part 10c of the third wheel and pinion supporting lever 10 is controlled at two points; the outside circumferential side face of the front end part 8d of a winding stem 8 and the base 8e of an arbor supporting part 8c at the time of wearing. The force that a third wheel arbor supporting part 10b moves in the direction parting from a central wheel 3 around a revolving central part 10c is, therefore, extremely large, since the spring part 10d is in the complete buckling direction. Disengagement of the intermeshed wheels is thus obviated and the deviated indication of the hands is prevented. The actuating part 10c of the lever is brought into pressurized contact by only the outside circumferential side face at the front end 8d of the winding stem and the force acts on the supporting part 10b in the direction parting from the wheel 3 with the central part 10a as the axis of rotation then the spring force of the part 10d is weakened. The failure of the respective wheels is, therefore, prevented at the time of the hand correction. Since the wheel 3 and a pinion part 4c are always held in contact with each other by a weak spring force, the hand deviation by the abrupt intermeshing of the wheel 3 and the third wheel and pinion 4 after the hand correction is obviated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pointer adjustment mechanism for a wristwatch.

[Conventional technology]

As wristwatches mature, costs are rapidly decreasing. One of the factors contributing to this cost reduction is a reduction in the number of parts. In pointer display type watches, reducing the number of backing parts, especially the pointer correction mechanism, has a significant impact on cost reduction, and various structures have been proposed.

As a conventional pointer correction mechanism, a slip mechanism is provided in the gear part of the center wheel and the minute pinion part, and when the pointer is corrected, the minute pinion part and the
The central gear that meshes with the number pinion is kept in a slip state, and the hour hand and minute hand are rotated via a thrush wheel, a small iron wheel, etc., in synchronization with the rotating movement of the winding stem. The rotation of the center gear, the third wheel, and the seconds wheel is stopped by slipping.

If the center wheel is provided with a slip mechanism in this way, the center wheel will require two or more parts. In addition, the magnitude of the slip torque is determined by the impact caused by the minute hand's one-sided weight even at the bottom.
It is necessary to do more than the torque at the time.

However, if it is too thick, the pointer adjustment gear of the Tsuzumi wheel or Kotetsu wheel may be worn out or damaged, and the torque management is also a major factor in increasing costs.

As a method for simplifying the slip structure by eliminating the center wheel, a structure has been proposed in which the number 3 pinion and the center gear are somehow disengaged when adjusting the pointer. For example, Japanese Utility Model Publication No. 56-19742 describes a configuration in which the No. 3 pinion is pressed by spring pressure, and when a large torque is applied, the No. 3 pinion escapes against the spring pressure. No. 58-49281 describes a structure in which the No. 3 pinion escapes via a lever in conjunction with the push and pull of the winding stem.

[Problem that the invention seeks to solve]

However, in the case of Utility Model Publication No. 56-19742,
The force of disengagement from the center gear of the third pinion is always constant, and if the module of each gear is IX or less and the material is plastic, as in a wristwatch, the force of disengagement from the center gear will be increased (this will cause tooth wear and tear). or damage, etc.
On the other hand, if the disengagement force is reduced, the number 3 pinion will come off due to the rotational force of the minute pinion at the time of impact due to one weight of the minute hand in normal use, causing problems such as indication deviation.

In addition, as in Japanese Utility Model Application Publication No. 58-49281, forcibly disengaging the No. 3 pinion and the center gear completely while the hands are being adjusted is not suitable for forcing the No. 3 pinion to completely disengage from the center gear when the no. Because the center gear engages with the impact, the pointer may momentarily deviate from its indication, and the pointer may have to be adjusted again.Furthermore, since the need for rotational load is small when adjusting the pointer, It has a drawback that is very difficult for general users accustomed to conventional slip structures to correct.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a pointer correction mechanism for a wristwatch in which pointers can be easily corrected (and indication deviations are less likely to occur).

[Means for solving problems]

As the structure of the present invention, a spring part is provided at one end of the rotary lever that pivotally supports the pinion part of the third wheel, and the spring force of the spring part is normally used, which is regulated by the tip side shaft part of the winding stem and the flange part. The above-mentioned purpose is attempted to be achieved by drastically changing the state and the guideline correction state.

〔Example〕

FIG. 1 is a plan view of the main parts of the embodiment of the present invention in the normal use state (when carried), FIG. 2 is a plan view of the main parts of the embodiment of the invention in the pointer correction state, and FIG. FIG.

1 is a rotor, and the power from the rotor 1 is sequentially decelerated to the 5th wheel 2 and the seconds wheel 7, and the second hand 1 attached to the seconds wheel 7.
Seconds are displayed by rotating 2. Also, second wheel 7
The deceleration is transmitted to 1/60 from the center wheel 6 via the third wheel 4, and the minute hand 16 attached to the center wheel 6 displays the minutes, and then from the hinoura wheel 5 to the hour wheel 11. The speed is reduced to 1/12, and the hour hand 14 attached to the hour wheel 11 displays the time, thereby forming a normal timepiece deceleration wheel train.

8 is a winding stem, commonly known as solo pan bead part 8a which determines the push/pull stroke and moderation of the crown, and a pusher panel 9. When carrying, the winding stem 8 is pushed in as shown in Fig. 1, and the pointer is When making corrections, the winding stem 8 is fixed in the pulled position as shown in Figure 2.

Further, the winding stem 8 is provided with shaft supports 8b and 80 of the tension wheel 6, and when normally carried, the inner diameters of the shaft support 8b and the tension wheel 6 are loose, and in the pointer correction state, the shaft support 8c and the shaft support 80 are provided. Tsuzumi! The inner diameter of No. 6 is lightly press-fitted to form a bottom base, and IJ,
- The Tsuzumi army 6 is rotated in synchronization with the rotation of the winding stem 8 due to the rotation of the winding stem 8.
It is designed to rotate.

Tsugumi car 6 is always on regardless of when it is carried or when the guideline is adjusted)
It meshes with the gear portion 5a of the rear wheel 5.

When carrying, the shaft portion 8b of the winding stem 8 and the inner diameter of the thread wheel 6 are loose, so the thread wheel 6 is in a free state.
It is constantly rotating at Hinouraguruma 5 with almost no load.

10 is the third wheel support lever, and the third wheel 40 cut portion 4C
A third axle shaft support 10b that pivotally supports a large diameter portion 4b having a slightly larger diameter, a rotation center portion 10a that is supported by a winding stem spacer or a base plate and serves as a center of rotation, and a spring portion 10d.

It is formed by an actuating portion 10C that is provided at the tip of the spring portion and engages with the outer peripheral side surface of the winding stem tip portion 8d.

When carried, this actuating portion 10C is in pressure contact with the outer circumferential side of the winding stem tip 8d and the bottom surface 8e of the shaft support 8c of the tension wheel 6, and when the pointer is being adjusted, the outer circumferential side of the winding stem tip 8d is pressed as shown in Fig. 2. It is designed to come into contact only with pressure.

To explain the operation, when carrying, use the third wheel support lever 1 mentioned above.
Since the 00 actuating part 10C is pressed against two places: the outer peripheral side surface of the winding stem tip 8d of the winding stem 8 and the bottom surface 8e of the shaft support 8C, the No. 3 axle support 10b presses against the upper part 10C during rotation. The force acts in the direction away from the center wheel 6 as an axis (in the direction of arrow A).The spring force is very strong because the spring portion 10d is in the direction of complete buckling. The central gear 6 is forcibly rotated by gravity, and the pinion part 4c is prevented from escaping (in the direction of arrow A) due to the force received from the tooth part 6a of the central gear B to the pinion part 4c of the third wheel 4. It has become.

On the other hand, when the winding stem is pulled and the pointer is corrected, the operating portion 10c of the third wheel support lever 100 is in the state where the winding stem 8 is pulled, so only the outer circumferential side surface of the winding stem tip 8d of the winding stem 8 is activated. It is pressed together.

Therefore, force acts on the third axle support lever 10b in the direction of moving the rotation center portion 10a away from the center wheel 6 (in the direction of arrow B), and the actuating portion 10'C of the third wheel support lever 10 moves as shown in the arrow. C
The spring portion 10d can move in the second direction.
As shown by the broken line in the figure (deforms and operates, the spring force becomes weaker, and the tooth portion 4a of the third wheel 4 is very likely to separate from the pinion portion 7a of the seconds wheel 7).
Become.

Now, when the winding stem is pulled and the pointer is corrected, turn the crown and rotate the winding stem 8, the throttling wheel 6 fitted to the winding stem 8 will also rotate, and the hinoura wheel 5 meshed with the thrush wheel 6 will rotate. From center car 6
The hour wheel 11 also rotates via the . Here, the pinion part 7a of the seconds wheel 7 and the tooth part 4a of the third wheel & pinion 4 are toothed to prevent speed-up rotation, and although the deceleration rotation is transmitted to the second wheel 7 and the third wheel & pinion 4 during normal hand movement, When increasing the speed of rotation from the third wheel 4 to the seconds wheel 7, the tips of the teeth miss each other, and are locked so that the 11 rotations are not transmitted.

In this case, the pinion portion 4C of the third wheel 4 is the toothed portion 6a of the center wheel 6.
The third wheel support lever 100 rotates around the rotation center 10a in the direction (arrow view B) in such a way as to escape from the center wheel, and the mutual meshing becomes disengaged, causing the second wheel 7 to rotate. This means that the center wheel 6 and hour wheel 11 will rotate.

The aforementioned force in the direction of escaping from the center wheel 6 can be controlled to be weaker than the force of the spring portion 10d of the third wheel support lever 10 than when normally carried.
Even if the center wheel 6, hour wheel 11, and third wheel 4 are made of a material such as plastic, it is possible to prevent each gear and pinion portion from being damaged. Furthermore, it is also possible to prevent the locking wheel 6 from slipping due to a reduction in the fitting force between the locking axle support 8C of the winding stem 8 and the locking wheel 6, resulting in failure to make corrections.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the slip structure between the gear part of the center wheel and the pinion part is abolished, and the simple pointer correction mechanism that disengages the No. 3 pinion and the center gear can be used normally. When carrying, the spring force of the third wheel support lever is increased to prevent misalignment (thus solving problems such as misalignment of the pointer, and when the pointer is being corrected, the spring force of the third wheel support lever is reduced). By controlling the disengagement force weakly, damage to each gear is prevented.
The center wheel and No. 3 pinion do not completely disengage, and the center gear and No. 3 pinion are always in contact with each other with weak spring properties, so after the pointer is corrected, problems such as pointer misalignment due to sudden meshing of both gears can be avoided. By checking the pointer every moment the pointer is corrected, deviations in indication caused by pushing in the leash can be eliminated.

In addition, even if each gear train including the third wheel is made of plastic gears and pinion integrally molded, it is possible to prevent damage to each tooth part, and in particular, management of the engagement force of the screw wheel and winding stem is the same as before. This greatly simplifies the vehicle slip structure and allows for significant cost reductions.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main parts of a watch according to an embodiment of the present invention when it is carried, FIG. FIG. 2 is a cross-sectional view of a main part of a timepiece according to an embodiment. 1...Rotor, 2...5th car, 6-...center car, 4...3rd car, 5...Hino Reverse wheel, 6...Tsuzumi stop, 7...Seconds wheel, 8...
Winding stem, 9... Pressing spring, 10...
・Third wheel support lever, 11... Hourly wheel, 12... Second hand, 16... Minute hand, 14... Hour hand.

Claims (1)

[Claims] In a pointer adjustment mechanism for a wristwatch that displays time using hour, minute, and second hands, a second wheel to which the second hand is attached, a center wheel to which the minute hand is attached, a third wheel that meshes with the second wheel and the center wheel, and an external It is composed of a winding stem as an operating member and a third wheel support lever that makes it possible to disengage the third wheel and the center wheel. A third wheel engaging portion that engages with the third wheel, a rotation center portion that serves as a rotation center, a winding stem engaging portion that engages with the winding stem, and a spring portion are formed on the winding stem. The winding stem engaging portion is formed with a first contact portion that engages when the pointer is being corrected and a second abutment portion that it engages when normally carried, and the third wheel support is formed when the pointer is corrected and when normally carried. A pointer correction mechanism for a wristwatch, characterized in that it is configured to change the spring force of a spring portion of a lever.