JPS59681A - Timepiece - Google Patents

Abstract

PURPOSE:To decrease the thickness of a titled timepiece and to facilitate a time adjustment by fitting a movement to a front cover rotatably and driving an hour hand by a cam in engagement with a fixed gear provided in the front cover. CONSTITUTION:The timepiece movement 6 is fixed in a movement case 7, which is fitted rotatably around the annular engagement projection part 5 of the front cover 1. The minute hand shaft 10 of the movement 6 is aligned to the centers of the case 7 and fixd gear 4 and pieces the fixed gear 4. An hour hand 13 engages the eccentric cam 11b of a minute hand bush 11 through a cam hole 13a and has an internl gear 13b engaging the fixed gear 4. Thus, the thickness is reduced and a time adjustment is made on the front surface, facilitating the time adjustment.

Description

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

Conventionally, the time setting knob for 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, many of the time setting knobs provided on the back side rotate constantly, and the hour hand stops when the knob comes into contact with a protrusion on the wall. Therefore, it is necessary to leave a sufficient gap between the clock and the wall, which makes it impossible to create a clock that fits perfectly against the wall.1 The entire clock becomes thicker. However, in this case, gears that mesh with the gear train and parts to change the rotation at right angles are not required, which not only complicates the structure but also makes it difficult to make it thinner. However, it was a hindrance.

Therefore, an object of the present invention is to provide a timepiece that is thinner and easier to set the time.

A major embodiment of this 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. Dial board 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 in 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.

To prevent it from slipping when rotating by hand, there is a candle (candle) #I7a cut on the outer periphery, and a battery storage recess 7 in the center.
There is b. 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. A minute hand bushing 11 is press-fitted into the tip of the minute hand shaft 10.

The minute hand pushbutton 11 has a pair of locking pieces 11a and an eccentric cam Ilb, and the minute hand 12 has a mounting hole 12a at the base end.
The minute hand shaft 10 is engaged with the locking piece 11a of the minute hand pusher 11 so as to be movable in the axial direction of the minute hand shaft 10. The hour hand 13 is the cam hole 13
It has an internal gear 13b that loosely engages the eccentric cam 11b of the minute hand bushing 11 at a point a and meshes with the fixed gear 4. Furthermore, inside the movement 6 is a step motor and a drive circuit for this motor.

Contains gears, etc.

Finally, I will explain how this watch works. The minute hand shaft 10 rotates once per hour as driven by the movement 6. Therefore, the minute hand 12tI'i rotates once per hour together with the minute hand bush 11 fixed to the minute hand shaft lO. The minute hand 12 is restricted in its direction of rotation.

Since there is 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.

1 by the eccentric cam Ilb provided on the minute hand pushbutton 11.
The internal gear 13b integrated with the hour hand 13 is moved.

The internal gear 13b has 12 teeth and the fixed gear 4 has 11 teeth.
Therefore, the internal gear 13b moves so as to roll around the entire circumference of the fixed gear 4, and the hour hand 13 moves 1 time per revolution of the minute hand axis IO.
Move /12 rotations.

When fully 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.
2 and the 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 setting the time 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. Furthermore, the movement case 7, which serves as the time setting knob, is normally fixed to the front cover 1.

Even if the movement case 7 is hit by another object, 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 where the movement coupe protrudes from the back side, the entire clock can be placed closely against the wall surface, which has a great effect on the visual sense of making the watch thinner.

In addition, when the movement 6 has a step motor 2 or the like, the stop position of the minute hand shaft is determined (for example, in a 30-second movement type, the stop position is divided into 120 equal parts).

Conventionally, when installing the hour and minute hands, it was necessary to determine the relationship with the scale on the dial plate, but in this embodiment, the entire movement 6 rotates, so the minute hand is 12 tons.
/'i Can be installed in any position 1. Good assembly workability.

As described above, the timepiece of this invention has a movement unit rotatably attached to 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 has the advantage of being easy to carry out and having a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. #I2 is a sectional view thereof, Fig. 3 is a partially enlarged sectional view thereof, Fig. 4 is an exploded perspective view thereof, and Fig. 185 is a movement case thereof. FIG. 1M6 is an exploded perspective view showing the hour and minute hands and the minute hand pusher, and FIG. 7 is a sectional view showing the relationship between the fixed gear and the hour hand. DESCRIPTION OF SYMBOLS 1...Front cover, 3...Dial plate, 4...Fixed gear, 6...Movement, 7...Movement case, 9...Battery, 10...Minute hand shaft, 11... Minute hand bushing, llb...eccentric cam, 12...minute hand, 1
3...Hour hand, 13a...Cam hole, 13b...Internal gear Fig. 2 Fig. 4 Fig. 6 Fig. 1b Fig. 7

Claims (2)

[Claims] (1) A transparent front cover having a fixed gear in the center of the back surface, a dial plate placed on the back side of the front cover through a gap and connected to the front cover at the peripheral edge, and a timepiece movement that is rotatably attached concentrically to the fixed gear and has a minute hand shaft that passes through the fixed gear and projects toward the dial; and a minute hand that is attached to the minute hand shaft. @A clock equipped with an eccentric cam attached to a distribution needle shaft, an hour hand having a cam hole fitted into the eccentric cam, and an internal gear meshed with the fixed gear. (2) The specified movement is fixed within a movement case and rotatably attached to the front cover via the movement case, and a battery is housed within the movement case. The clock listed.