JPS61202185A - Pointer corrective device of timepiece - Google Patents

Abstract

PURPOSE:To enable plasticization of a wheel train by directly engaging an hourglass wheel revolved through a winding spindle with a pointer correction transmitting gear integrated with a revolving shaft of a No.3 wheel of the slip structure and thus reducing a pointer corrective torque. CONSTITUTION:When pulling out a winding spindle 12, a winding spindle top shaft portion 12b fits in a small hole portion 11a and the winding spindle 12 and an hourglass wheel 11 are connected by friction. In this state, when revolving the winding spindle 12, a pointer correction transmittig gear 10a integrated with a rotating shaft 10 of a No.3 wheel 10d of the slip structure and directly engaged with a wheel 11 revolves under interlocking and a time correction is conducted with a low torque without using a small iron wheel etc. As a result, a backside-bound wheel train which is a pointer corrective device can be plasticized.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to an improvement in a timepiece pointer adjustment device.

[Background of the invention]

In recent years, plastic application technology has become popular, and cost reductions have been rapidly promoted by using plastic parts for watches, and plastic materials are also being used for parts such as the main plate, gear train bridge, and front gear train. It became so. However, in the back wheel train that constitutes the pointer adjustment device of a watch, the pointer adjustment torque of the winding stem is high, and in order to guarantee the mechanical strength of the back wheel train, a metal back wheel train is used. There is. Therefore, there has been a need for a new type of pointer correction device with low pointer correction torque that can be made of plastic for the reverse gear train.

[Prior art and problems]

FIGS. 1 and 2 are sectional views of essential parts of a conventional timepiece hand adjustment device.

In a conventional general pointer correction device, a dial wheel 2 is attached to a corner 1a of the winding stem 1 so that it can slide in the direction of the winding stem axis and rotate integrally with the winding stem 1 in the rotational direction. When the winding stem 1 is engaged and the winding stem 1 is pulled out from the normal winding stem position shown in Fig. 1 and the winding stem 1 is set to the pointer correction position as shown in Fig. 2, it operates in conjunction with the winding stem 1. The mandrel wheel 3 and the cane wheel 4 engaged with the mandarin mandrel O slide the screw wheel 2 and engage with the small iron wheel 5, and by rotating the winding stem 1, the screw wheel 2 moves from the small iron wheel 5 to the small iron wheel 5. The minute hand wheel 7 is rotated via the day wheel 6 to adjust the pointer.

At this time, in order to prevent the pointer adjustment torque transmitted to the minute hand wheel 7 from being transmitted to the power side gear train,
b receives the action of a braking force from a braking device (not shown) installed in the wheel train structure on the power side. Furthermore, since the minute hand wheel 7 constitutes a so-called slip mechanism in which the minute hand gear 7b is slipably fitted to the shaft portion 7a of the minute hand wheel 7, the pointer correction torque is transmitted to the shaft portion 7a of the minute hand wheel 7. In this case, the shaft portion 7a of the minute hand wheel 7 rotates while slipping with the minute hand gear 7b which receives the braking force from the brake device, so that the time can be corrected normally.

The slip torque value between the shaft portion 7a of the minute hand wheel 7 and the minute hand gear 7b during pointer correction is approximately 2 g·cm to 8.0 g·cm. ! It is set to i'cm or higher. Therefore, the pointer correction torque value when operating the winding stem in the conventional reverse wheel train is
The slip torque value is almost equal to or higher than that of the minute hand gear 7b, and the diameter of gear modules such as small iron wheels used in watch-sized movements is approximately 0.9 to 0.16 mm. Considering the strength and durability of the teeth, Tsuzumi wheels, small iron wheels, etc. had to be made of metal, making it difficult and expensive to use plastic with conventional pointer correction devices. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a pointer correcting device which contributes to cost reduction by using a plastic wheel train as the pointer correcting device.

[Structure of the invention]

In the pointer correction device of the present invention, in the pointer correction state, the dial wheel rotated by the rotating operation of the winding stem directly meshes with the pointer correction transmission gear provided integrally with the rotating shaft of the third wheel having a slip structure. It is characterized by the fact that

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. Third
FIG. 4 shows a sectional view of a main part of a pointer correction device according to an embodiment of the present invention.

The third wheel 10 has a pointer correction transmission gear 10a that meshes with the stopper wheel 11, a rotating shaft pinion 10e1 that meshes with the minute hand gear 13a, a rotating shaft pinion 10e1 that meshes with the minute hand gear 13a, and a rotating shaft 10b that is integrally molded with a plastic material. The portion 10C is provided with a slip mechanism composed of a No. 3 slip gear 10d having an elastic arm portion and slip-fitted with a certain spring force. Third
The figure shows the normal winding stem 12 position, and the screw wheel 11 is
It is molded from plastic material, and the hole is a narrow hole 11a.
The small hole part 11a and the tip hole part 11b are loosely fitted into the small diameter part 12a and the tip shaft part 12b of the winding stem 12, respectively. In this state, the suspension wheel 11 meshes with the pointer correction transmission gear 10a of the third wheel & pinion 10, and rotation is constantly transmitted.

When the winding stem 12 is pulled out and placed in the pointer adjustment position as shown in FIG. 12 and the Tsuzumi wheel 11 rotate simultaneously due to frictional coupling. By rotating the winding stem 12, the rotating shaft 10b integrated with the pointer correction transmission gear 10d is rotated via the adjusting wheel 11, and the rotation is further transmitted from the rotating shaft pinion 10e to the minute wheel 16. The guidelines have been revised, and there is no need to use small railway cars as in the conventional technology. At that time, No. 3 slip gear 1
0d is the 3rd slip gear 1 which is affected by the braking force of the brake device (not shown) installed in the power side wheel train structure.
Since the sliding portion 10C of the rotary shaft 10b and the rotating shaft 10b slip to prevent the pointer correction torque from being transmitted to the power-side wheel train structure, normal pointer correction can be performed. Naturally, when adjusting the pointer, the fitting part between the winding stem 12 and the stopper wheel 11 should be set at a value sufficiently higher than the slip torque value of the slip mechanism provided on the third wheel 10 so that the pointer can be reliably corrected without slipping. The fitting torque between the tip shaft portion 12b of the winding stem 12 and the narrow hole portion 11a of the ratchet wheel 11 is guaranteed so that a high torque value can be transmitted to the rotating shaft 10b.

In order to prevent the rotor (not shown) from rotating toward the power side when the pointer is corrected, a slip mechanism has conventionally been installed on the minute hand wheel.In this case, the slip torque value is equal to In order to prevent the pointer from being misplaced due to overload on the wheel train or needle scratches, etc.
However, if a slip mechanism is provided on the third wheel and the slip torque value of the third wheel is set to 4 to 8 cm when converted to the minute wheel. , reduction ratio (tooth ratio) for the slip torque value of the minute hand wheel
It can be lowered by that amount. Therefore, the tension wheel 11, which rotates together with the winding stem 12, directly rotates around the rotation axis 10 of the third wheel 1°.
Since it is structured to mesh with the pointer correction transmission gear 10a provided at point b to transmit the information, the rotational torque value of the winding stem at the time of pointer correction is lower than in the conventional case.

〔Effect of the invention〕

As is clear from the above embodiments, according to the present invention, 3
Since the number wheel is provided with a slip mechanism, the slip torque value is already 1/1/1 by the reduction ratio (tooth number ratio) between the minute hand gear and the third wheel pinion, which is greater than the slip torque value when the minute hand wheel is provided with a slip mechanism.
It can be set as low as 1/15 of 10-J, and the pointer can be set as low as 1/15 by directly rotating the pointer correction transmission gear provided on the rotating shaft of the third wheel from the needle wheel, which rotates integrally with the winding stem. Because of the structure that performs correction, the rotational torque when operating the winding stem becomes low.

Therefore, when adjusting the pointer, the force applied to the teeth of the dial wheel when rotating the pointer correction transmission gear becomes smaller.
In terms of strength, the Tsuzumi car can be easily made of plastic.

In addition, in fitting the winding stem shaft and the screw wheel when adjusting the pointer, even when the winding stem made of a metal member and the screw wheel made of plastic molding are fitted, the fitting torque required for function is sufficiently applied. You can get it. Therefore, it is possible to use plastic for the winding wheel, which is a rear part, and there is no need to make the shape of the winding stem into a corner shape, which fits the winding wheel, as in the past, making it easier to process the winding stem and reducing costs. The down is measured. Also'1. ．． ．． [Ell) When adjusting the pointer on the back wheel and the minute wheel, due to the wheel train structure, the slip torque at No. 3 is not directly applied to the day wheel and the minute wheel.
It can be easily made into plastic, resulting in significant cost reductions.

In the above embodiment, the needle correction transmission gear provided on the rotating shaft of the third wheel is always in mesh with the needle adjustment wheel when the hands are moving. , the needle wheel is made slidable using a bolt, and during normal hand operation, the needle wheel and the gear for transmitting pointer correction are disengaged, and only when the needle is centered in the needle correction position, the needle wheel and needle are moved. It may also be a mechanism that engages the pointer correction transmission gear.

[Brief explanation of drawings]

1 and 2 are sectional views of essential parts showing a conventional timepiece pointer adjustment device, and FIGS. 3 and 4 are sectional views of essential parts showing a timepiece pointer adjustment device according to an embodiment of the present invention. It is. 1.12... Winding stem, 2.11... Tsuzumi wheel, 10... Third wheel, IDa... Pointer correction transmission gear, IDb... Rotating shaft, 10C...
...Sliding part, 1[]d...Gear, 10e...
...Rotating axis kana, 6.14...Hinoura car, 7.
16...Minute wheel.

Claims (1)

[Claims] A pointer correction device for a watch that adjusts the hands by rotating a gear train via a knob wheel interlocked with the winding stem by operating a rotatable and slidable winding stem, comprising: a gear for transmitting pointer correction;
A rotating shaft pinion, a sliding part, and a rotating shaft are integrally provided, and the pointer correction transmission gear of the third wheel, which is equipped with a gear that slip-fits into the sliding part, and the screw wheel are directly engaged at least when correcting the pointer. A watch pointer correction device featuring: