JPS6341503B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a watch.

Conventionally, the time setting knob of wall clocks has often been provided on the back side of the clock, but this has been troublesome as it has been necessary to set the time after removing the clock. In addition, the time setting knob provided on the back side often rotates all the time, and the clock stops when the knob comes into contact with a protrusion on the wall. Therefore,
It is necessary to leave a sufficient gap between the watch and the wall, which has disadvantages such as not being able to make a clock that fits tightly against the wall, and making the entire clock thicker.

In addition, some conventional wall clocks have a time-setting means installed at the bottom, but in this case, gears that mesh with the wheel train and parts to change the rotation at right angles are required, which not only complicates the structure, but also makes the structure complicated. This was also an obstacle to making the device thinner.

An object of the present invention is to provide a timepiece that is thin, easy to set the time, and requires no parts for setting the time, and is simple in structure and assembly.

An embodiment of the invention is shown in FIGS. 1 to 7. In the figure, 1 is a transparent front cover;
It is fitted into a circular hole 2a of a rectangular outer peripheral frame 2. The dial plate 3 is arranged on the back side of the front cover 1 with a slight gap and fixed to the outer peripheral frame 2. The front cover 1 has an integral fixed gear 4 on the inner surface of the center,
It has an annular engagement protrusion 5 on its outer surface. The timepiece movement 6 is fixed within a cap-shaped movement case 7, and the movement case 7 is rotatably fitted into the annular engagement protrusion 5 of the front cover 1 with an appropriate force or more. Movement case 7
A knurled groove 7a is cut on the outer periphery to prevent slipping when rotated by hand, and a battery storage recess 7b is provided in the center. The battery cover 8 is fitted onto the movement case 7 and is opened and closed when replacing the battery 9. The minute hand shaft 10 of the movement 6 is aligned with the center of the movement case 7 and the fixed gear 4, and passes through the fixed gear 4. Minute hand axis 10
A minute hand bushing 11 is press-fitted and fixed to the tip of the minute hand bushing 11. The minute hand bushing 11 has a pair of locking pieces 11a.
and an eccentric cam 11b, and the minute hand 12 is engaged with a locking piece 11a of the minute hand bushing 11 through a mounting hole 12a at the base end so as to be movable in the axial direction of the minute hand shaft 10. The hour hand 13 is loosely engaged with the eccentric cam 11b of the minute hand bushing 11 through the cam hole 13a, and the fixed gear 4
It has an internal gear 13b that meshes with. In addition,
A step motor, a drive circuit for this motor, gears, etc. are housed within the movement 6.

Next, the operation of this watch will be explained. Minute hand axis 10
The movement 6 rotates once per hour. Therefore, together with the minute hand bush 11 fixed to the minute hand shaft 10, the minute hand 12 rotates once per hour. The minute hand 12 is restricted in the direction of rotation, but has some play in the vertical direction.
If the distance between the dial 3 and the front cover 1 is slightly wider than the thickness of the hour hand 13 and the minute hand 12, the movement will be possible without difficulty. Eccentric cam 11 provided on minute hand bush 11
b causes the internal gear 13b integrated with the hour hand 13 to move. Since the internal gear 13b has 12 teeth and the fixed gear 4 has 11 teeth, the internal gear 13b rolls around the fixed gear 4, and the minute hand shaft 1
Hour hand 13 moves 1/12 rotation with one rotation of 0.

When setting the time, rotate the movement case 7 by hand. As a result, the minute hand shaft 10 rotates with respect to the dial 3 together with the movement 6, and the minute hand 12 and hour hand 13 can be set to the correct time.

Since the time is set by rotating the movement case 7 in this manner, no parts for time setting are required and the structure is simple. Moreover, since the time can be set from the front, there is no need to remove the clock from the wall, making it easy to set the time. In addition, since the movement case 7, which serves as the time setting knob, is always fixed to the front cover 1,
Even if another object hits the movement case 7, the watch will not stop.

Moreover, since the movement case 7 protrudes from the front, the thickness of the entire watch becomes thinner. Furthermore, unlike the case in which the movement case 7 protrudes to the back side, the entire timepiece can be placed in close contact with a wall surface, which has a great effect on the visual sense of making the watch thinner.

Also, if the movement 6 is a step motor type, etc., and the stop position of the minute hand axis is fixed (for example, 30
In the past, when installing the hour and minute hands, it was necessary to determine the relationship with the scale of the dial.
In this embodiment, since the entire movement 6 rotates, the minute hand 12 can be mounted at any desired position, which facilitates assembly.

As described above, in the timepiece of this invention, the movement is rotatably mounted on the front cover, and the hour hand is driven by a cam that meshes with the fixed gear provided on the front cover, so it can be made thinner and moreover, it is easy to set the time. It is easy to perform and has a simple structure. In addition, the movement is fixed inside the movement case and rotatably attached to the front cover through the movement case, and the battery is housed inside the movement case, so there is no need for parts for time adjustment and the structure is simple. It also has the effect of being easy to assemble.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a partially enlarged sectional view thereof, Fig. 4 is an exploded perspective view thereof, and Fig. 5 is a movement thereof. FIG. 6 is an exploded perspective view showing the case and battery, FIG. 6 is an exploded perspective view showing the hour and minute hands and the minute hand bushing, and FIG. 7 is a sectional view showing the relationship between the fixed gear and the hour hand. 1...Front cover, 3...Dial plate, 4...Fixed gear, 6...Movement, 7...Movement case, 9...Battery, 10...Minute hand shaft, 11...
Minute hand bush, 11b... Eccentric cam, 12... Minute hand, 13... Hour hand, 13a... Cam hole, 13b...
...Internal gear.

Claims (1)

[Claims] 1. A transparent front cover having a fixed gear in the center of the back surface, a dial plate disposed on the back surface of the front cover through a gap and connected to the front cover at the peripheral edge, and the fixed gear on the front surface of the front cover. a timepiece movement that is rotatably mounted concentrically with a gear and has a minute hand shaft that penetrates the fixed gear and projects toward the dial; a minute hand that is mounted on the minute hand shaft;
The movement includes an eccentric cam attached to the minute hand shaft, an hour hand having a cam hole fitted into the eccentric cam, and an internal gear meshed with the fixed gear, and the movement is fixed within a movement case. A watch that is rotatably attached to the front cover via a movement case, and a battery is housed within the movement case.