JPS6316715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timepiece with time difference correction.

With conventional regular watches, when you move between regions with time differences, you only need to adjust the time in units of time.
Since the minute hand also moves with the watch, it was necessary to adjust the minute hand to the correct position again. There are also models that allow you to adjust only the hour hand alone,
This requires levers and clutches, as well as correction buttons, making the structure complex.
There were problems with cost, reliability, etc.

Therefore, an object of the present invention is to be able to correct the time difference on an hourly basis and eliminate the need to readjust the minute hand.
Moreover, it is an object of the present invention to provide a clock with a simple structure.

An embodiment in which the present invention is applied to a wristwatch is shown in FIGS. 1 to 4. In the figure, reference numeral 1 denotes a main body case, and a transparent disc-shaped front cover 3 is rotatably attached to the front surface of the main body case via a frame 2. A fixed gear 4 having 11 teeth is provided on the inner surface of the front cover 3 and protrudes concentrically with the center of rotation. 5 is main case 1
This is a clock movement housed in a clock movement, and a minute hand shaft 6 is provided concentrically with a fixed gear 4 and protrudes oppositely. The timepiece movement 5 houses a motor, a circuit block for driving the motor, and a battery, and a reuse 7 projecting outward from the main body case 1 is attached. 8 is a minute hand attached to the minute hand shaft 6;
The minute hand 8 has an eccentric cam 9. Reference numeral 10 denotes an hour hand, which is rotatably mounted around the eccentric cam 9 through a cam hole 11 and has an internal gear 12 that meshes with the fixed gear 4. The internal gear 12 has 12 teeth. 13 is a dial. Marks 14 and 15 are provided on the main body case 1 and the front cover 3 to adjust the rotation angles of each other.

Next, the operation of this watch will be explained. Since the minute hand 8 is attached to the minute hand shaft 6 of the clock movement 5, it rotates once every 60 minutes. The hour hand 10 is fitted into an eccentric cam 9 fixed to the minute hand 8 through a cam hole 11, and an internal gear 12 is meshed with the fixed gear 4, so that it is rotated by the drive of the minute hand shaft 6. Since the fixed gear 4 has 11 teeth and the internal gear 12 has 12 teeth, the hour hand 10 rotates 1/12 for one revolution of the minute hand 8.

When setting the time, pull out the Reuse 7 and turn it to rotate the minute hand shaft 6 and bring the hour hand 10 and minute hand 8 to the correct position. When traveling through an area with a time difference, by rotating the front cover 3 while leaving the Reuse 7 in place, it is possible to move only the hour hand 10 without leaving the minute hand 8 in place. That is, since slippage occurs between the cam 9 and the cam hole 11, the minute hand 8 does not move. In this case, the fixed gear 4 of the front cover 3 has 11 teeth and the internal gear 12 of the hour hand 10 has 12 teeth, so one rotation of the front cover 3 can correct the time difference by one hour. . In this way, the time difference can be corrected on an hourly basis. Moreover, since the front cover 3 is simply made rotatable, no special parts for time difference correction are required, and the structure is simple.

In addition, in the above embodiment, the number of teeth of the fixed gear 4 is 11,
The number of teeth of the internal gear 12 is 12, but the fixed gear 4
The number of teeth of the internal gear 12 may be 11×n (n is an integer), and the number of teeth of the internal gear 12 may be 12×n. Further, although in the embodiment described above, the eccentric cam 9 is provided integrally with the minute hand 8, it may be provided separately.

As described above, in the watch of this invention, the transparent front cover is rotatably attached to the main body case, and the hour hand is driven by meshing with the fixed gear provided on the front cover, so that the time difference can be corrected in hourly units. There is no need to readjust the minute hand, and there is no need to add special parts, resulting in a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is an exploded perspective view showing the minute hand and hour hand, and Fig. 4 is the relationship between the hour hand and the fixed gear. FIG. 1...Main case, 3...Front cover, 4...
Fixed gear, 5... Clock movement, 6... Minute hand shaft, 8... Minute hand, 9... Eccentric cam, 10... Hour hand, 11... Cam hole, 12... Internal gear.

Claims (1)

[Claims] 1 A main body case, which is rotatably attached to the front of this main case and has 11×n teeth on its inner surface (n is an integer).
a transparent front cover having a number of fixed gears concentric with the center of rotation; a timepiece movement having a minute hand shaft that is housed in the main body case and projects concentrically with the number of fixed teeth; and a minute hand attached to the minute hand shaft. and an eccentric cam attached to the minute hand or the minute hand shaft, and an internal gear having 12×n teeth that meshes with the fixed gear and having a cam hole that rotatably fits into the eccentric cam. A clock with an hour hand concentric with a cam hole.