JPS626191B2 - - Google Patents

Description

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

Conventional analog watches have a structure in which the watch movement is fixed to the case body, the hands are press-fitted into the hour hand pipe and the minute hand pipe, and the front face thereof is covered with a front cover. Therefore, there are many parts,
Moreover, the number of assembly steps is large, resulting in high costs. Furthermore, conventional clocks require special parts to set the time, which also increases the number of parts.

Therefore, an object of the present invention is to provide a timepiece that has a simple structure, a small number of parts, and is easy to assemble.

An embodiment of the invention is shown in FIGS. 1 to 7. In the figure, 1 is the case, 2 is the front cover,
3 is a camera back, 4 is a motor, 5 is a transmission gear, 6 is a minute wheel, and 7 is an hour wheel. The case 1 has a cylindrical shape with the front portion narrowing toward the rear, and the rear portion with a cylindrical shape. The front cover 2 is made of a transparent body, has a cylindrical peripheral wall part on the outer periphery of a disc-shaped part, and is rotatably fitted to the front part of the case 1. This fitting is such that the front cover 2 can be rotated by applying a small amount of force. A retaining protrusion 8 is provided on the inner surface of the tip of the peripheral wall portion of the front cover 2, and is fitted into an engagement groove 9 on the outer periphery of the front portion of the case 1. A watertight annular packing 32 is interposed between the retaining projection 8 and the inner surface of the engagement groove 9.
The front cover 2 has a time display scale 2 on the outside or inside.
a, and also serves as a dial. At the center of the inner surface of the front cover 2 is a fixed gear 10 with 11 teeth.
are integrally formed. Reference numeral 11 denotes a nameplate affixed to the center of the outer surface of the front cover 2, which hides the fixed gear 10, the hour hand wheel 7, and the like. The minute wheel 6 has a shaft portion that projects upward and downward, and is rotatably supported in bearing holes 12 and 13 provided in the case 1 and the front cover 2. The minute wheel 6 has an eccentric cam 14 in the center of the front.
and has an internal gear 15 on the outer periphery of the rear surface. Further, a minute hand display 16 is printed on the front surface of the minute hand wheel 6. The outer diameter of the minute wheel 6 is approximately the same as the inner diameter of the front cover 2. The hour hand wheel 7 has an hour hand 17 integrally formed therein, and has a cam hole 18 in the center that engages with the eccentric cam 14 of the minute hand wheel 6.
An internal gear 19 that meshes with the fixed gear 10 of the front cover 2 is provided on the outer periphery. The internal gear 19 has 12 teeth.
It is formed coaxially with the cam hole 18. The transmission gear 5 is rotatably supported by a support shaft 20 provided integrally with the case 1, and meshes with an internal gear 15 of the minute hand 6 and a drive gear 22 provided on the rotor 21 of the motor 4. It fits.

The motor 4 has a cylindrical shape and is fitted into the cylindrical portion of the case 1. Note that the motor 4 is provided with a rotation stopper (not shown) to prevent it from rotating relative to the case 1. The motor 4 has a support shaft 23 protruding from an end surface, and the rotor 2 is attached to this support shaft 23.
1 is rotatably fitted. The rotor 23 is arranged coaxially with the minute wheel 6. The motor 4 has a built-in coil 25 and an oscillator module 26, and the rotor 21 rotates in one direction by applying voltage to a negative terminal plate 28 and a positive terminal plate 29 fixed to the end face of the motor case 27. . 30 is a battery, which is formed to have approximately the same diameter as the motor 4. The battery 30 is housed in the case 1 with one side in contact with the negative terminal plate 28 of the motor 4 and the outer peripheral surface in contact with the positive terminal plate 29. A press plate 31 is provided on the back cover 3 to press the battery 30 against the negative terminal plate 28. The back cover 3 is detachably attached to the case 1 using a screw type or elastic fitting type attachment structure. 33 is a gasket fitting groove provided in the case 3, into which a watertight annular gasket 34 that contacts the back cover 3 is fitted.

When incorporating this watch into various types of equipment, the front cover 2 is fixed to the equipment and the case 1 is left in a free state.

The assembly method will be explained. First, the motor 4 is inserted from the back side of the case 1, then the battery 30 is inserted, and the back cover 3 is fitted. The transmission gear 5 is inserted from the front side of the case 1, and then the minute hand wheel 6 is inserted, and the hour hand wheel 7 is placed on top of the minute hand wheel 6. After that, the front cover 2 is fitted onto the case 1, and the assembly is completed.

Next, the operation of this watch will be explained. Rotor 2
1 rotation is transmitted to the minute hand wheel 6, but each gear 5, 15, 22 is rotated so that the minute hand wheel 6 rotates once per hour.
The number of teeth and the rotation speed of the motor 4 are set. For example, if the motor 4 is a step motor with 16 poles and is driven by a pulse once every 30 seconds, the rotor 2
It is assumed that the number of teeth of the driving gear 22 of No. 1 is 8, and the number of teeth of the internal gear 15 of the minute hand wheel 6 is 60. In this case, 1/16×
8/60 = 1/120, and the minute wheel 6 changes to 1/120 every 30 seconds.
Rotate, that is, rotate by 3 degrees. The internal gear 19 of the hour hand 7 meshes with the fixed gear 10 of the front cover 2 and is driven by the eccentric cam 14 to reduce the speed from the minute wheel 6 to the hour wheel 7. 7 is the ratio of 1/12 rotation. The time is set by rotating the case 1 while keeping the front cover 2 fixed. At this time, since the internal gear 19 of the hour hand wheel 7 is meshed with the fixed gear 10 of the front cover 2, the hour hand wheel 7 rotates at an appropriate angle as the case 1 rotates, and the time is set.

Hand movement and time setting are performed in this way, but unlike the conventional method in which the hands are press-fitted into the hour hand pipe and the minute hand pipe, the minute hand display 16
The hour hand wheel 7 has a minute hand wheel 6 and an hour hand 17 which are provided with
The number of parts is small and assembly is simple. In addition, a time display scale 2a is provided on the front cover 2, and the rotation of the hour hand wheel 7 is regulated by a fixed gear 10 provided on the front cover 2, thereby changing the relative rotation angle between the front cover 2 and the case 1. Since the time is set, there is no need to provide a separate means for setting the time, which also reduces the number of parts. Furthermore, a minute hand wheel 6 with a minute hand display 16 is provided.
Since the minute hand wheel 6 hides the driving means such as the transmission gear 5, and the time display scale 2a is provided on the front cover 2, there is no need for a dial, which also reduces the number of parts. .

In addition, since the time display scale 2a is provided on the front cover 2, the overall outer diameter can be made approximately the same as the minute wheel 6. Therefore, the display can be enlarged in proportion to the size of the front surface of the front cover 2. can do. In addition, since the case 1 has a cylindrical shape with a large diameter at the front and a small diameter at the rear, and the cylindrical motor 4 is housed in this, the outer shape of the case 1 can be formed to be thin and deep. It fits well when installing a clock embedded in the panel of a device.
In particular, since case 1 is cylindrical, the weight balance does not change even if case 1 is rotated to set the time, so it can be installed stably.
Furthermore, since the shape does not change even when rotated, there is no need to provide extra installation space when installing it embedded in equipment.

On the other hand, a watertight gasket 32 is provided between the front cover 2 and the case 1 and between the back cover 3 and the case 1.
34, a reliable waterproof function can be obtained. Furthermore, unlike conventional watches, there is no need for the time setting shaft to protrude from the case, which also makes it excellent in waterproofness.

In the above embodiment, the internal gear 19 of the hour hand wheel 7
The number of teeth is 12, and the number of teeth of fixed gear 10 is 11, but the number of teeth of internal gear 19 is 12 × n (n is an integer).
Alternatively, the number of teeth of the fixed gear 10 may be 11×n.

As described above, the watch of the present invention has a cylindrical case with a large diameter at the front and a small diameter at the rear;
A transparent cover is rotatably attached to the front surface of the case, has a fixed gear having 11×n teeth (n is an integer) on its inner surface, and has a time display; A minute wheel is rotatably held between and has an eccentric cam at the center of the front face and an internal gear at the periphery of the rear face, and a minute hand wheel is disposed between the minute hand wheel and the cover and has free play on the eccentric cam of the minute hand. an hour hand wheel having a cam hole to match with the fixed gear and an internal gear having 12×n teeth that meshes with the fixed gear and concentrically with the cam hole; Since it is equipped with a motor having a rotor at the front end and a transmission gear for transmitting rotation between the rotor of the motor and the internal gear of the minute hand wheel, the structure is simple and there is no need to separately purchase the motor. There is no need to provide a time setting means or a dial plate, etc., so the number of parts is small and assembly is easy. Moreover,
Since the case is cylindrical, it fits well in cases such as recessed installation, and the cylindrical shape has the effect that no extra space is required when rotating the case to set the time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, and FIG.
The figure is a rear view of the same, FIG. 5 is an exploded perspective view of the whole, FIG. 6 is a partially exploded perspective view of the same, and FIG. 7 is a sectional view showing the relationship between the hour hand wheel and the fixed gear. . 1... Case, 2... Front cover, 3... Back cover, 4... Motor, 5... Transmission gear, 6... Minute wheel, 7... Hour hand wheel, 10... Fixed gear, 14...
Eccentric cam, 15... Internal gear, 16... Minute hand display, 17... Hour hand, 18... Cam hole, 19... Fixed gear, 21... Rotor, 30... Battery, 32,
34...Patsukin.

Claims (1)

[Claims] 1. A case formed in a cylindrical shape with a large diameter at the front and a small diameter at the rear, and a case rotatably attached to the front of the case and having a number of teeth of 11×n (n is an integer) on the inner surface. A transparent cover with fixed gears and a time display; a minute hand rotatably held between the cover and the case; an eccentric cam at the center of the front surface; and an internal gear on the periphery of the rear surface. a wheel, and an internal gear having 12×n teeth that is disposed between the minute hand wheel and the cover, has a cam hole that engages with the eccentric cam of the minute hand wheel, and meshes with the fixed gear. an hour hand wheel concentric with the cam hole; a cylindrical motor fitted into the case and having a rotor at its front end;
A timepiece comprising a transmission gear for transmitting rotation between the rotor of the motor and the internal gear of the minute hand wheel. 2. A battery storage space is provided in the case located behind the motor, a back cover is provided on the rear end surface of the case so that it can be opened and closed, and a space between the back cover and the case and between the cover and the case is provided. The timepiece according to claim 1, wherein the fitting portion is provided with packing.