JPH05876Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a drive structure for a display wheel of an analog display type timepiece.

[Prior art]

Conventionally, in analog display watches with day and day display functions, the date wheel has a cam for setting the date and a cam for setting the day. Or, it was something to send on the day of the week. In other words, the date wheel only moves intermittently to advance the calendar, i.e., moves the date wheel and day wheel by one tooth or two or three teeth every 24 hours, and does not rotate continuously for purposes other than displaying the day and week. There was a problem with displaying pictures and characters.

〔the purpose〕

The present invention is an application of the calendar feeding mechanism of such a date wheel, and its purpose is to improve the design effect of the display board by providing continuous rotation to the display board. Furthermore, it is possible to provide a multi-functional watch that can be easily varied in model with a small change from a conventional watch with a date and day adjustment mechanism.

〔overview〕

The display wheel drive structure of the analog display type timepiece of the present invention consists of a rotating hour wheel placed in the center of the timepiece, an integral gear and a display plate disposed coaxially with the shaft of the hour wheel, an indicator wheel that rotates around the indicator wheel, and a date wheel that is integrally formed with an intermediate gear having teeth around the entire circumference that mesh with the gear of the indicator wheel, and a gear that meshes with the hour wheel. The display wheel is characterized in that the display wheel is continuously rotated at a constant period along with the rotation of the hour wheel.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments and drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line E-Ro.

In FIGS. 1 and 2, 1 is a display wheel, which is formed by a gear 1-a and a display plate 1-b. Reference numeral 2 denotes a date wheel, which has an intermediate gear 2-a having teeth around its entire circumference, and meshes with the gear 1-a of the display wheel 1. 3 is an hour wheel that meshes with the date wheel 2. 4 is a stop seat that holds down the display wheel 1.

As is well known, the date wheel 2 is decelerated by the hour wheel 3 and rotates once every 24 hours. The rotation of the date wheel 2 is transmitted to the gear 1-a of the display wheel 1 by an intermediate gear 2-a fixed or integrally formed on the date wheel. At this time, by manipulating the reduction ratio between the intermediate gear and the gear of the display wheel, the display wheel rotates continuously at an arbitrary fixed period.

For example, if the reduction ratio is set to 1, the rotation of the date wheel is directly transmitted to the display wheel, and the display wheel 1 rotates once every 24 hours. If the reduction ratio is set to 1/2, the display wheel will rotate once every 48 hours. In this way, by manipulating the reduction ratio between the intermediate gear 2-a and the gear 1-a of the display wheel 1, it is possible to give an arbitrary rotation to the display board 1-b. Animation display, morning/pm display,
Various continuous rotating displays such as world time display, day/night display, etc. are possible.

FIG. 3 is an application example of the above-mentioned embodiment, in which a date mechanism is further provided in the above-mentioned embodiment, and a fourth
The figure is a sectional view of the harness.

In FIGS. 3 and 4, 1 is a display wheel, which is formed by a gear 1-a and a display plate 1-b. 2 is the cam 2 for sending the date on a daily rotating car.
- has b. 2-a is an intermediate gear fixed on the date wheel 2. 3 is an hour wheel, 4 is a stopper seat, and 5 is a pin for fixing the date wheel and the intermediate gear. 6 is the day wheel.

Intermediate gear 2-a coaxially fixed to the date wheel 2
is engaged with the gear 1-a of the display wheel 1, and the display plate 1-
b is continuously rotated at an arbitrary period. Further, a cam 2-b for setting the date provided on the date wheel engages with the date wheel 6 to move the date wheel by one tooth every 24 hours.

As a means for fixing the date wheel 2 and the intermediate gear 2-a, in addition to the pin 5, adhesives, screws, etc. may be used. Also, although it is not as easy to assemble, it has the same function even if it is constructed integrally by plastic molding or the like.

〔effect〕

By adopting such a configuration, the present invention allows the speed of the display wheel to be arbitrarily changed by simply changing the reduction ratio between the gear of the display wheel and the intermediate gear formed on the date wheel. A special reduction mechanism part between the display wheel and the intermediate gear is not required.

In addition, a mechanism for reducing speed by arranging intermediate gears in a plane requires a space equal to the diameter of the gears, resulting in a large clock. However, if the sun wheel can be formed by coaxially overlapping the gears meshing with the intermediate gear and the hour wheel as in the present invention,
Since the thickness is only increased by the thickness of the intermediate gear, the size of the watch does not become as large as when the intermediate gears are arranged in a plane, so it is possible to provide a drive mechanism suitable for miniaturized watches.

Therefore, the reduction ratio can be set with a simple configuration by simply changing the number of teeth on the display wheel or the intermediate gear without increasing the number of parts or increasing the space for placing the reduction gear. This makes it possible to provide an excellent display vehicle drive mechanism.

Furthermore, in a configuration where characters and pictures are displayed directly on the date wheel or on a display board placed coaxially with the date wheel, the characters and pictures can only be displayed where the date wheel is placed.

However, by configuring the display wheel to rotate around the center of the clock as in the present application, the display plate can be made almost the same size as the clock frame, so the characters and pictures drawn on the display plate can be displayed larger, and the display window can be positioned at the 6 o'clock position or 12 o'clock position.
To provide a multi-function watch with an excellent design that can be arranged in a well-balanced position like the hour position.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the display wheel drive structure of the present invention. FIG. 2 is a sectional view showing the E-Ro section of FIG. 1. FIG. 3 is a plan view showing an embodiment of the display wheel drive structure of the present invention, which is equipped with a date display function. 4 is a sectional view showing the Harney section of FIG. 3. FIG. 1...display wheel, 2...day indicator wheel, 3...hour wheel,
4... stop seat, 5... pin, 6... date wheel.

Claims (1)

[Claims for Utility Model Registration] A rotating hour wheel arranged in the center of a timepiece, a gear and a display plate large enough to cover the entire date wheel are integrally formed and are coaxial with the shaft of the hour wheel. A display wheel that rotates around the display wheel, an intermediate gear having teeth around the entire circumference that mesh with the gear of the display wheel, and a gear that meshes with the hour wheel are formed coaxially and overlapping in the axial direction. A display of an analog display type timepiece, characterized in that the display wheel has a date wheel, and the display wheel is continuously rotated at a desired speed by a reduction ratio of the gear of the display wheel and the intermediate gear. car drive structure.