JPS6051666B2 - Analog clock calendar - gear train structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a calendar array structure for an analog timepiece.

Among quartz watches, thinner and smaller wristwatches without additional functions have been developed and commercialized for a long time due to the emphasis on fashionability.

However, in recent years, there have been many requests for wristwatches with additional functions to be made thinner and smaller. In particular, a calendar function is an essential function in daily life, and it is desired that it be added without compromising fashion. In order to meet these demands, it is important to eliminate overlap between parts as much as possible. However, the calendar wheel train configuration of a wristwatch with this type of calendar function is designed to be thinner, for example, as shown in FIGS. The cylindrical gear 1a and the daily dial 3 supported by the hole 2a provided in the main plate 2 are directly meshed,
A pawl 3a having a date function that protrudes from the outer diameter of the gear is formed at one of the teeth of the date dial 3, and the pawl 3a
A structure was adopted in which the date plate 4 was made to slide. This gear train configuration has no overlapping parts and seems to be the most suitable for thin watches. However, hour wheel 1
The tooth bottom diameter of the daily cylindrical gear 1a mounted on the daily cylindrical gear 1a is determined by the claw 3a formed on the daily cylindrical gear 3, and the outside diameter of the daily cylindrical gear 1a cannot be made small. It was hot. That is, the fitting part with the hour wheel 1 and the daily cylinder gear 1
In order to ensure sufficient mechanical strength for the remaining thickness A consisting of the tooth bottom diameter of a, the outer diameter of the daily cylinder gear 1a must be increased, and therefore the diameter of the daily plate 4 must be increased. As a result, when viewed as a wristwatch, the date plate window position, which should be approximately in the center between the center of the watch and the outer periphery of the dial, is placed closer to the outer periphery, which is a factor that impairs the design.
In other words, even if the movement is made smaller, if the outer diameter of the date plate does not become smaller, there is no point in seeing it as a complete watch. Naturally, one possible way to secure the remaining thickness A of the hourly hourly wheel 1a is to integrate it with the hourly wheel 1 using plastic material, but considering the need to remove the knife when removing the needle or time, the strength Also, since the day plate seat 6, which is the support member of the day wheel 5, is snapped into the groove lb provided in the hour wheel 1, there is a risk of damaging the hour wheel 1 when removing it. This method should be avoided as confusion in the market can be easily inferred. On the other hand, increasing the size of the hour wheel 1a has the disadvantage that the hour wheel 1 becomes proportionally larger. In other words, the most suitable means for making the central part of the movement thinner is to provide the support member 8, which also serves as an hour wheel pusher, at the step between the hour wheel 1 and the date cylinder gear 1a. As a means of making the wheel train thinner, the lower shaft 9a of the third wheel 9 that drives the center wheel 7 is arranged in the same cross section as the hour wheel 1, which results in an increase in the diameter of the entire front wheel train. This is clearly the case, and it becomes a fatal structure for watches that are becoming smaller. Furthermore, since such a daily indicator wheel structure is limited to a molded product made of plastic, it has been difficult to further reduce the thickness of the daily indicator wheel 3 itself. Next, the structure shown in FIG. 3 will be explained. This is a conventional example in which the daily gear and pawl are independent, and is a gear train configuration aimed at miniaturization. Daily cylinder gear 1a attached to hour wheel 1
The daily dial gear 3b, which is a component of the daily dial wheel 3, are linearly meshed with each other, and the daily dial gear 3c is connected to the daily dial gear 3.
The date dial 4 is engaged and held by the bead 3d which is pushed into and fixed to the date dial 3b, and the date plate 4 is slid by engaging the concave portion provided on the date dial gear 3b and the convex portion provided on the date date dial body 3c. make it move. According to this structure, the tooth profile of the daily cylinder gear 3b can be made into a general standard tooth profile, so there is no need to intentionally increase the size of the daily cylinder gear 1a. However, there was a drawback in that the outer diameter of the daily dial gear 3c had to be smaller than the outer diameter of the daily gear 3b in order to allow clearance with the daily cylinder gear 1a. Therefore, the only structure that can be used is that the date wheel 3b and the date plate 4 overlap in cross section, which creates a wasted space B between the date wheel 1a and the day wheel 5, which makes it difficult to create a thin watch. It was difficult to recruit. It is an object of the present invention to be applicable to thinner and smaller watches. This was developed for the purpose of obtaining a calender wheel train configuration that can be used in a variety of ways, and will now be explained based on the embodiment shown in FIGS. 4 and 5. A center wheel 7 and an hour wheel 1 disposed between the main plate 2 and the dial 10 are pivotally supported by a center vibrator 11 implanted in the main plate 2, and the center wheel 7 rotates from the third wheel 9. is communicated,
The hour wheel 1 is rotated via a hino-ura wheel (not shown). The center wheel 7 and the hour wheel 1 are controlled by a support member 8 that also serves as a lower handle holder of the third wheel 9 and for supporting the hour wheel 1.
The daily dial gear 3b, which is a component of the hour wheel 3, is a component of the hour wheel 1.
An idler wheel 12 is engaged and supported by a bead 8a, which is implanted in the support member 8, from the daily hour wheel 1a mounted on the
(This is also referred to as an idler gear or a daily transmission gear), and by engaging a concave portion provided on the daily date gear 3b and a convex portion provided on the daily date tightening body 3c, Slide the plate 4. Note that the daily dial dial 3c is made into a block so that it is regulated by the daily dial seat 3e1 pushed into the daily dial wheel 3b. The gist of the present invention is that an idler wheel 12 having no deceleration function is interposed between the daily cylinder gear 1a and the daily cylinder gear 3b, and by adopting this gear train configuration, the date plate 4 can be arranged without overlapping with the daily dial gear 3b both in plane and in cross section.

That is, as shown in FIG. 5, the true center distance C between the daily cylinder gear 1a and the daily cylinder gear 3b can be freely set. This makes it possible to make the outer diameter of the daily dial gear 3c larger than the outer diameter of the daily dial gear 3b. In addition, 5 is a day wheel, and the day time dial 3f is welded and fixed on the daily time dial body 3c.
Rotated by As described above, according to the present invention, it is possible to reduce the outer diameter of the daily cylinder gear to the minimum diameter. Therefore, the date plate can be made smaller and the date plate window can be placed in a well-balanced position when viewed as a completed watch.
A calendar clock with excellent design can be obtained, and a calendar mechanism can be mounted without increasing the size of the front wheel train, which is highly effective for small calendar clocks for women. Furthermore, since the hour wheel to which the hour hand is attached can be made of metal, a highly reliable movement can be provided. Furthermore, since the date dial and the date gear can be arranged without overlapping in cross section, the thinner watch has a greater effect. As mentioned above, this will have a tremendous effect on calendar watches that will become thinner and smaller in the future.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional calendar wheel train configuration, FIG. 2 is a plan view of the main part of FIG. 1, FIG. 3 is a cross-sectional view of another conventional calendar wheel train configuration, and FIG. The figure is a sectional view of a calendar wheel train configuration showing an embodiment of the present invention, and FIG. 5 is a plan view of the main part of FIG. 4. 1... Hourly wheel, 1a... Pharyngeal cylinder gear, 2
...Main plate, 3...Old series wheel, 3b...
・・Condolence gear, 3c・・・Old time font, 4・・・・
... old board, 5... day wheel, 6... day board seat, 7...
...Center wheel, 8...Support member, 9...
Third wheel, 10...Dial board, 11...Center vibrator, 12...Idle wheel.

Claims (1)

[Claims] 1. In a calendar gear train structure of an analog clock in which a center wheel and an hour wheel to which minute and hour hands are attached are each arranged concentrically between the main plate and a dial, the date attached to the hour wheel or hour wheel. A reduction function is provided between the rotary cylindrical gear and the daily cylindrical gear, which is driven by the hour wheel or the daily cylindrical gear and is equipped with a daily dial that slides on the daily cylindrical gear and the date plate. A calendar wheel train structure for an analog watch, characterized in that an idler wheel is provided and the outside diameter of the sun gear is made larger than the outside diameter of the sun gear.