JPH0563751B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a watch.

(Prior Art) Conventional watches generally display the time by having an hour hand and a minute hand directly fixed to an hour hand shaft and a minute hand shaft, respectively, which are coaxially fitted and protrude through the dial.

Furthermore, the hour and minute scales on the dial indicated by the hour and minute hands were arranged at equiangular pitches from the center of rotation of the hour and minute hands.

(Problems to be Solved) In the above-mentioned conventional watches, the movement of the hour and minute hands has little variation, and the hour and minute scales on the dial are equiangular pitches, resulting in a uniform design.

In view of the above-mentioned circumstances, an object of the present invention is to provide a timepiece that attracts the attention of viewers by changing the time display with a simple configuration and by making the hour and minute scales have an unprecedented shape.

(Means for Solving the Problems) A first feature of the present invention is that the hour and minute hands are fixed to the tips of the hour and minute shafts that are coaxially fitted and protrude through the mounting plate. and,
An hour display gear and a minute display gear are rotatably supported on the front surfaces of the tips of the hour and minute hands, and are fixedly disposed so as to mesh with an hour display gear and a minute display gear that have marks near the outer periphery of the front face thereof. It consists of an internal gear with an internal gear, and a translucent front cover with hour and minute scales along the rotation locus of the mark.

A second feature of the present invention is that the hour display gear and the minute display gear have different pitch circles.

(Function) Therefore, when the hour and minute hands rotate, the hour and minute display gear, which is pivotally supported at the tip, meshes with the internal gear and rotates, causing the mark on this display gear to move cycloidally. display the time.

(Example) An example of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a timepiece mechanical body 2 is fixed to the back side of a mounting plate 1 by suitable means. The center hole 1a of the mounting plate 1 has an hour hand shaft 3 and a minute hand shaft 4.
are fitted coaxially and protrude, and an hour hand 5 and a minute hand 6 are press-fitted and fixed to each tip.
A pin 7 is attached to the tip of the hour hand 5, and an hour display gear 9 is connected to the outer periphery of the pin 7 via a bush 8.
is rotatably supported. The same applies to the minute hand 6, and a minute display gear 10 is rotatably supported on the outer periphery of the pin 7a via a bush 8a.

As shown in FIG. 2, the hour display gear 9 and the minute display gear 10 are provided with ● marks 9a and 10a near their respective outer peripheries. This mark 9
It is desirable to use a and 10a that are different in size, color, or shape.

On the side wall of the mounting plate 1 are hour and minute display gears 9,
An internal gear 1b, which can be engaged with both of the internal gears 10 and 10, is integrally provided.

Further, in front of the mounting plate 1, a translucent front cover 11 is held between the internal gear 1b and the front frame 12. The rear frame 13 is connected to the front frame 12 by screws 14...

By the way, the pitch circle diameter of the hour display gear 9 is set to 1/4 of the pitch circle diameter of the internal gear 1b.
When the hour hand 5 rotates once, the hour display gear 9 rotates four times relative to the hour hand 5. Therefore, the rotation locus of the mark 9a located near the outer periphery of the hour display gear 9 draws a cycloid curve, the apex of which is ``'', as shown in the second diagram.
It is in the position ``'', ``'', ``''. Along the rotation locus which is this cycloid curve, the hourly scale 1
5 is provided on the front cover 11. Furthermore, the pitch circle diameter of the minute display gear 10 is set to 1/5 of that of the internal gear 1b, and when the minute hand 6 rotates once, the minute display gear 10 rotates five times relative to the minute hand 6. Therefore, the rotation locus of the mark 10a on the minute display gear 10 also draws a cycloid curve, but its apex is at 0 minutes,
They are located at the 12th, 24th, 36th, and 48th minutes. A minute scale 16 is provided on the front cover 11 along the cycloidal rotational locus, similar to the hour scale 15.

An opaque seal 17 concentric with the hour and minute hand axes is attached to the center of the front cover 11, making the center invisible.

Next, the operation of the present invention will be explained.

The rotational driving force from the timepiece mechanical body 2 is transmitted to rotate the hour hand 5 and minute hand 6, and the hour display gear 9 and minute display gear 10 mesh with the internal gear 1b to rotate the pins 7, 7.
Rotate around a. For this reason, mark 9
a, 10a also rotate around the pins 7, 7a to draw a cycloid curve, and the time is displayed by the mark 9a on the hour display gear 9 and the mark 10a on the minute display gear 10.

Figure 2 shows a state where the time is 10:10.

In this embodiment, the ratio of the pitch circle diameter to the internal gear 1b is set to 1/4 for the hour display gear 9 and 1/5 for the minute display gear 10, but the ratio is not limited to this. Needless to say, various combinations are possible.

(Effects) As described above, according to the present invention, the hour and minute scales are formed on a cycloid curve, unlike the conventional one with equal angular intervals, so that a unique time display format never seen before is possible. Therefore, it is possible to provide a watch that attracts the attention of viewers. Furthermore, since the configuration is simple, it can be provided at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
FIG. 1 is a cross-sectional side view, and FIG. 2 is a partially cutaway front view. 1...Mounting plate, 1b...Internal gear, 3...Hour hand shaft, 4...Minute hand shaft, 5...Hour hand, 6...Minute hand, 9
...Hour display gear, 9a...Mark, 10...Minute display gear, 10a...Mark, 11...Front cover, 15...Hour scale, 16...Minute scale.

Claims (1)

[Scope of Claims] 1. An hour hand shaft and a minute hand shaft that are coaxially fitted and protrude through the mounting plate; an hour hand and a minute hand that are respectively fixed to the tips of the hour hand shaft and the minute hand shaft; An hour display gear and a minute display gear are rotatably supported on the front surface of the tip of the hour hand and the minute hand, and have a mark near the outer periphery of the front surface thereof, and the hour display gear and the minute display gear are fixed so as to mesh with each other. and a translucent front cover that is placed in front of the hour and minute display gears and has hour and minute scales along the rotation locus of the mark. A clock consisting of. 2. The timepiece according to claim 1, wherein the hour display gear and the minute display gear have different pitch circles.