JPH0299886A - Timepiece - Google Patents

Abstract

PURPOSE:To arouse interest of an observer by making display gears for hour and minute supported with a shaft at the tip of hour and minute hands rotate being meshed with an internal gear as the hour and minute gears turn to display a time with a mark on the display gear making a cycloid motion. CONSTITUTION:A timepiece machine body 2 is fastened on the back of a mounting plate 1 and a hour hand shaft 3 and a minute hand shaft 4 are fitted into a center hole 1a of the mounting plate 1 coaxially being projected and a hour hand 5 and a minute hand 6 are press fitted securely at each tip thereof. A pin 7 is mounted at the tip of the hour hand 5 and a hour display gear 10 is supported with a shaft free to turn on the outer circumference of the pin 7 through a bushing 8 and a minute hand 6 is constructed in the same manner. The gear 9 and a minute display gear 10 are provided with a mark near a circumferential part thereof. An internal gear 1b is provided integral on a side wall part of the mounting plate 1 in such a manner that it can be meshed with both of the gears 9 and 10. A light transmitting front cover 11 is grasped between the gear 1b and a front frame 12 ahead of the mounting plate 1 and a rear frame 13 is connected to the front frame 12 with screws 14... with such an arrangement, graduations of hour and minute are formed on a cycloid, thereby enabling the arousing of interest from an observer.

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 a dial.

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

(Problem to be solved) In the conventional watches described above, there is little change in the movement of the hour and minute hands, and the hour and minute scale on the dial is also at equal angular pitch.
The design was uniform.

In view of the above-mentioned circumstances, the present invention changes the time display with a simple configuration, and by making the hour and minute scales in an unprecedented shape,
The aim is to provide watches that attract the attention of viewers.

(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. - An hour display gear and a minute display gear that are rotatably supported on the front surface of the tips of the hour hand and the minute hand and have marks near the outer periphery of the front face thereof, and a fixed gear that is fixed so that these gears mesh with each other. It consists of an internal gear located at the top of the screen, and a translucent front cover on which hour and minute scales are provided 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 of the hour and minute hands, meshes with the internal gear and rotates, and the mark on this display gear makes a cycloidal movement while showing the time. Display.

(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. An hour hand shaft 3 and a minute hand shaft 4 coaxially fit into and protrude from the center hole 1a of the mounting plate 1, and an hour hand 51 and a minute hand 6 are press-fitted and fixed to the tips of each, respectively.

A pin 7 is attached to the tip of the hour hand 5, and this pin 7
An hour display gear 9 is rotatably supported on the outer periphery of the clock via a bush 8. The same goes for the minute hand 6, and the pin 7
A minute display gear 10 is rotatably supported on the outer periphery of the dial 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. It is desirable to use marks 9a and 10a of different sizes, two colors, or different shapes.

An internal gear 1b with which both the hour and minute display gears 9 and 100 can mesh is integrally provided on the side wall of the mounting plate 1.

In addition, a translucent front cover 11 is placed in front of the mounting plate 1.
It is held between the gear 1b and the front frame 12. Rear frame 1
3 is connected to the front frame 12 by screws 14...

By the way, the pitch circle diameter of the hour display gear 9 is the internal gear 1b.
This is set to 1/4 of the pitch circle diameter, and when the hour hand 5 makes one rotation, the hour display gear 9 makes four rotations 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 rXIIJ shown in the second diagram.

Located at rmJ, rVIJ, and rlXJ. An hourly scale 15 is provided on the front cover 11 along this rotation locus which is a cycloid curve. Furthermore, minute display gear 1
The pitch circle diameter of 0 is set to 115 of that of the internal gear 1b, and when the minute hand 6 makes one revolution, the minute display gear 10 makes five revolutions 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 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 rotation locus which is a cycloid curve, 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 the minute hand 6, and the hour display gear 91 and minute display gear 10 mesh with the internal gear 1b and rotate about the pin 77a. Therefore, the marks 9a and 10a also rotate around the pin 7.7a to draw a cycloid curve, and the hour display gear 9
The time is displayed by the mark 9a on the top and the mark 10a on the minute display gear 10.

FIG. 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 1/42 for the hour display gear 9 and 11 for the minute display gear 10.
5, but it is not limited to this, and it goes without saying that various other combinations are possible.

(Effects) As described above, according to the present invention, the hour 1 minute scale is formed on a cycloid curve, unlike the conventional one with equal angular intervals, so a unique time display format that has not been 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 present invention, with FIG. 1 being a sectional side view and FIG. 2 being a partially cutaway front view. 1 ・ b 3 ・ 4 ・ 5 ・ 6 ・ 9 ・ a 10 ・ ・Mounting plate, ・Internal gear, ・Hour hand axis, ・Minute hand axis, ・Hour hand, ・Minute hand, ・Hour display gear, ・Mark, ・Minute display Gear, ・Mark, ・Front cover, Hour scale, ・Minute scale. that's all

Claims (2)

[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 fixed to the tips of the hour hand shaft and the minute hand shaft, respectively; An hour display gear and a minute display gear are rotatably supported on the front surface of each tip and have marks near the outer periphery of the front surface, and the hour display gear and minute display gear are fixedly arranged so as to mesh with each other. A clock consisting of an internal gear, and a translucent front cover, which is placed in front of the hour display gear and minute display gear, and has hour and minute scales along the rotation locus of the mark. . (2) The timepiece according to claim 1, wherein the hour display gear and the minute display gear have different pitch circles.