JPH068981B2 - Clock with constellation display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a timepiece having a constellation display function.

[Conventional technology and problems]

A clock with a constellation display in which the hour and minute hands that indicate the solar time and the constellation display plate that makes one revolution on one star day are provided on the same display surface and they are driven simultaneously by a single drive source is as shown below. Since there are many conditions required for, the configuration is complicated and the display is easy to see.

First of all, as a train wheel condition, the relationship between solar time and stellar time is not a well-separated ratio, so it is necessary to configure an accurate approximate rotation ratio via a regulating wheel, and the ratio between solar time and stellar time is Since it is very close to 1, it takes much time to make corrections in the needle-turning state at the time of initial alignment, and alignment is almost impossible. Therefore, it is necessary to use a structure that allows rapid correction. As a display method, a constellation display plate centered on the celestial north pole, which is generally used in the northern hemisphere, can display all constellations on the horizon, but on the other hand, each constellation becomes smaller, and also on the horizon. The proportion of the constellation display range showing is occupied on the dial surface is also small,
Especially, it is very difficult to see as a wrist watch. From the above, there is great expectation for a timepiece with a constellation display that satisfies the above requirements with a simple configuration.

[Object of the Invention]

The present invention has been made to solve the above problems, and an hour and minute hand that indicates the solar time and a constellation display plate that makes one rotation in one star day are simultaneously driven by a single drive source, and the initial adjustment time is set. In the case of, the quick correction and good operability, the proportion of the constellation display area on the dial surface is large, the individual constellations are easy to see, and the train wheel structure is simple, especially with a constellation display suitable for small watches such as wristwatches. The purpose is to provide a watch.

[Structure of Invention]

In order to achieve the above object, in the present invention, an hour wheel holding an hour hand is provided through an adjusting wheel provided with a slip mechanism.
The second hour wheel, which is concentric with the hour wheel that rotates once on a fixed star day, is installed.
The second hour wheel holds a constellation display plate, and the rotation axis of the constellation display plate is a polar axis, and the southern sky stars are drawn in the central part and the northern sky stars are drawn in the outer peripheral part. In addition, there is a window surrounded by an upwardly convex arc-shaped curve that is the northern limit of the constellation display and an upwardly convex arc-shaped curve that indicates the horizon, and the constellation display plate can be seen through the window.

Example of Invention

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a timepiece with a constellation display according to the present invention, FIG. 2 is a sectional view showing a main part of a train wheel mechanism of the timepiece of FIG. 1, and FIG. 3 is of a timepiece of FIG. FIG. 4 is a plan layout view showing an outline of a train wheel, and FIG. 4 is a plan view of a constellation display plate of the timepiece of FIG. 1. In the figure, 1 is a clock with a constellation display, 2
Is a constellation display plate, 3 is an hour hand for displaying the hour, 4 is a minute hand, and 5 is a second hand. Reference numeral 6 denotes a dial, which is provided with a 12-hour scale 6a at a position corresponding to the hour hand 3 and a constellation display window 6b for allowing the constellation display plate 2 to be seen through.
b is declination +35 which is the northern limit of the constellation display on this watch.
NE, E, SE, S, S indicating directions on the dial 6 which is surrounded by a circular arc 6c indicating ° and a circular arc 6d indicating a horizon at a north latitude of 35 ° and faces the circular arc 6d indicating the horizon.
Characters 6e of W, W and NW are drawn. Constellation display board 2
Declination from -55 ° to +35 with the south pole of heaven as the center of rotation.
The main stars (omitted in the figure) between °, the celestial equator 2a, the ecliptic 2b, the declination line 2c and the meridian line 2d at every 15 ° are drawn by the orthogonal projection from the celestial north pole. In the projection method, the magnification differs between different declinations, but the magnification in the declination direction and the right ascension direction at each point is the same, and the distortion of the projected shape is small, and the corresponding horizon 6d of the dial 6 is also an arc. It is also beautiful and convenient for processing. Further, on the constellation display plate 2, the numbers 2e from 0 to 23 indicating the time of right ascension and the numbers 1 to 12 indicating the position of the sun at the beginning of the month on the ecliptic 2b are shown on the outer periphery corresponding to each right ascension line 2d. The number 2f is drawn, and the 12-position mark 6 indicates the south-center direction of the dial 6.
By reading the RA value corresponding to a ', the star time can be known, and in the daytime, by reading the sun position on the ecliptic 2b corresponding to the moon, the sun position on the celestial sphere can be known. ing.

Next, the train wheel of the timepiece of this embodiment will be described.

In the figure, 7 is the fourth wheel and the second hand 5 and 8 is the center wheel and the minute hand 4
However, 9 is a hour wheel, to which the hour hands 3 are attached respectively. Reference numeral 10 is a Hino back car, a center pinion 8a of the center wheel 8 and a cylindrical gear 9a of the hour wheel 9.
The hour wheel 9 meshes with the hour wheel 9 and the hour wheel pinion 9b.
It is composed of and. Further, reference numeral 11 is an adjusting wheel, which is composed of an adjusting gear 11a and an adjusting wheel pinion 11b.
The back plate 14 is loosely fitted to the adjusting wheel pin 13 fixed to 2.
By means of the above-mentioned method, a slip function portion 11c for slipping under a load of a predetermined torque or more is provided between the adjusting gear 11a that meshes with the hour wheel pinion 9b and the adjusting wheel pinion 11b that meshes with the second hour wheel 15. ing. The constellation display plate 2 is fixed to an end portion of the second hour wheel 15 on the dial plate 6 side, and the second hour wheel 15 is loosely fitted to the hour wheel 9. Further, the hour wheel 9 is a second hour wheel 15 to which the constellation display plate 2 is attached.
And needle seat 1 for removing the effect of backlash in the train wheel
6 and 6 are sandwiched between the main plate 12 and the back plate 14 including the pearl oyster. Reference numeral 17 denotes a correction intermediary wheel, which is composed of a correction intermediary gear 17a that meshes with the second hour wheel 15 and a correction intermediary pinion 17b that meshes with the correction wheel 18, and the rotational movement from the crown 19 to the correction wheel 18 by the winding stem 20 is
At the normal position 19a, the wheel does not spin and is not transmitted, and the first pull position 1
9b, it is transmitted integrally with the winding stem 20, but is disengaged from the correction wheel 18 at the two-step pulling position 19c.
The rotation operation from 9 is performed by the correction vehicle 18 via the correction vehicle 18.
Is configured to be transmitted to.

Next, the operation will be described.

As is known, the reduction ratio from the fourth wheel 7 to the minute pinion 8a is 1
/ 60 is set, and the reduction gear ratio from the minute pinion 8a to the hour wheel 9 via the Hinoura wheel 10 is set to 1/12, whereby the hour wheel 9 makes one revolution in 12 hours.

1 Average star day, that is, the average rotation period for the vernal equinox of the earth is 23 hours 56 minutes 4.091 seconds at the time of the average sun, and in order to match the rotation speed of the constellation display plate 2 to the apparent average movement speed of the star, the second hour wheel 15 is used. It is necessary to configure the number of teeth of the train wheel from the hour wheel 9 to the second hour wheel 15 so that the rotation speed per day (24 hours / 23 hours 56 minutes 4.091 seconds), that is, a value very close to 1.00027379 rotations. When the combination of the number of teeth is 12 to 73 and the approximation accuracy is the best, the number of teeth of the hour wheel pinion 9b on the drive side and the adjustment pinion 11b is 3N and 61.
The number of teeth of the adjusting gear 11a on the driven side and the second hour wheel 15 is 5N and 73 (N is an integer of 4 or more and 14 or less). The annual cumulative error of the constellation display plate 2 is for the mean motion of the star
It is only a 0.2 degree advance. Further, with the maximum number of teeth range set to 98, the numbers of teeth of the hour wheel pinion 9b and the adjustment pinion 11b on the drive side are 51 and 79, and the numbers of teeth of the adjustment gear 11a and the second hour wheel 15 on the driven side are 82. By setting the number of teeth to 98, there is a combination of teeth with very good approximation accuracy in which the second hour wheel 15 rotates 1.00027377 per day, but in practice, the former has many combinations of teeth and the approximation accuracy is also high. It is easy to use because it is sufficient for constellation display. Here, the hour wheel 9 is a combined hour wheel composed of the hour wheel gear 9a and the hour wheel pinion 9b, because the hour wheel pinion 9b is not restricted by the meshing condition with the Hinoura wheel 10.
This is because you can choose the number of teeth. In addition, hour wheel 9 and second hour wheel 15
By passing the adjusting wheel 11 between and, the rotation direction of the constellation display plate 2 attached to the second hour wheel 15 becomes the same right rotation as the hour hand 3 attached to the hour wheel 9, and the heaven's south pole is rotated. This coincides with the rotation condition of the central constellation display plate 2.

The operation at the time of initial adjustment will be described below.

First, the crown 19 is pulled out from the normal position 19a to the two-step pulling position 19c, and then the hour hand 3 and the minute hand 4 are adjusted by a normal operation. Then, the crown 19 is pushed in to start the second hand 5, and the hour hand 3 and the minute hand 4 are started. 4. Set the second hand 5 to the current time (average solar time).

Next, when the crown 19 is moved to the one-pull position 19b, the correction wheel 18 engages with the winding stem 20, and the rotational force of the crown 19 is transferred from the winding stem 20 to the correction wheel 18, the correction intermediate wheel 17, and the second barrel wheel 15.
Is transmitted to the adjusting wheel pinion 11b of the adjusting vehicle 11. Since the slip function portion 11c is provided between the adjusting wheel pinion 11b of the adjusting wheel 11 and the adjusting gear 11a, the adjusting gear 11a slips during the above transmission and the hour hand 3, the minute hand 4,
Since the second hand 5 continues normal hand movement, only the constellation display plate 2 attached to the second hour wheel 15 on the display surface is the crown 1
It is corrected by the rotation of 9.

The 12 o'clock position mark 6 indicating the south-center direction of the dial 6 shown in FIG.
The right ascension value of the constellation display plate 2 corresponding to a'is made to coincide with the local star at the observation point, and the crown 19 is set to the normal position 19
Returning to a, the initial setting of the constellation display plate 2 and the time is completed.

The clock shown in Fig. 1 is the sky above the horizon at declination + 35 ° south of declination at 11:12:35 AM (or PM) at the average solar time and 1:40 AM local sidereal time at 35 ° north latitude. And shows the arrangement of the sky in the sky around April 24 (or October 23) in Tokyo.
Also, declination -55 °, which can be seen at the north latitude of 35 °
Of the celestial sphere north of the north, the area south of declination + 35 ° occupies about 77%, and the declination of the celestial sphere appearing and disappearing due to the diurnal motion excluding the celestial sphere with the polar star always visible on the horizon. +35
The area south of ° reaches about 85%, but the celestial sphere in the above range is constructed so that the timepiece shown in Fig. 1 can display it.

〔The invention's effect〕

As described above, according to the present invention, a timepiece with a constellation display that is easy to operate at the time of initial setting and has a small cumulative display error can be obtained by simply adding a simple back wheel train to the conventional timepiece train wheel, and a constellation display. In the department, it is possible to directly read the local sidereal time, of course, it is possible to display most of the star fields that appear and disappear due to diurnal movement, and individual constellations can be viewed easily, and it corresponds to the day of the ecliptic drawn on the constellation display board By reading the sun position, the sun position on the celestial sphere can be known, and a constellation display clock that accurately displays the sunrise and sunset conditions not only in the south but also at the reference latitude can be obtained.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view of a timepiece with a constellation display, FIG. 2 is a cross-sectional view showing the essential parts of a train wheel mechanism of the constellation display timepiece, and FIG. FIG. 4 is a plan view showing an outline of a train wheel of a timepiece with a constellation display, and FIG. 4 is a plan view of a constellation display plate. 2 ... constellation display board, 3 ... hour hand, 6 ... dial, 6b ...
… Constellation display window, 9 …… Cylinder wheel, 11 …… Adjustment wheel, 15 ……
Second cylinder car.

Claims (2)

[Claims] 1. A constellation display timepiece comprising a pointer display mechanism driven by a motor via a timepiece train wheel, and a constellation display plate that engages with the timepiece train wheel and rotates. A second hour wheel that holds the constellation display plate concentrically arranged with the hour wheel driving hour wheel, and an adjusting wheel that engages the hour wheel and the second hour wheel. The vehicle includes a first gear and a second gear that are concentrically arranged and have a slip function and are coupled to each other, the first gear is engaged with the hour wheel, and the second gear is the second hour wheel. A watch with a constellation display characterized by engaging with. 2. The constellation display plate has its rotation axis as a polar axis, the southern sky stars are drawn in the central part, and the northern sky stars are drawn in the outer peripheral part, and the upper limit of the constellation display is shown above the dial. Claims characterized in that it has a window surrounded by a convex arc-shaped curve and a convex arc-shaped curve showing the horizon, and is configured to see through the constellation display plate from the window. First
A clock with a constellation display as described in paragraph.