JPS5826286A - Timepiece - Google Patents

Abstract

PURPOSE:To facilitate assembly and to adjust time through the rotation of a timer case, by driving an hour hand by a fixed gear provided on the internal surface of a transparent cover and an eccentric cam provided to a minute hand wheel. CONSTITUTION:When the rotation of the rotor of a step motor is transmitted to a minute hand wheel 6, the minute hand wheel 6 rotates once in an hour. For the deceleration from the minute hand wheel to an hour hand wheel 7, the internal gear 19 of the hour hand wheel 7 engages the fixed gear 10 of a front surface cover 2 and is driven by an eccentric cam 14, so the hour hand wheel 7 has a 1/12 turn in every turn of the minute hand wheel 6. For time adjustment, a case is rotated with the cover 2 fixed. At this time, the internal gear 19 of the hour hand wheel 7 engages the fixed gear 10, so the hour hand wheel 7 rotates at an adequate angle according to the rotation of the case 1, thus performing the time adjustment.

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 main body of the T-case, the hands are press-fitted into the hour hand vibrator and the minute hand pipe, and the front surface of the watch is covered with a front cover. Therefore, the number of parts is large, the number of assembly steps is large, and the cost is high.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a watch that is simple in structure, has a small number of parts, and is easy to assemble.

1 to 7 show examples of this invention, 1 is a case, 2 is a front cover, 3 is a back cover, 4 is a motor, 5 is a transmission gear, 6 is a minute wheel, 7 is the hour hand wheel. The case 1 has a cylindrical shape with a rear cupboard 19 at the front and a cylindrical shape at the rear. The front cover 2 is made of a transparent body, and has a cylindrical peripheral wall portion on the outer periphery of a disc-shaped portion,
It is rotatably fitted into a part of the case 1. This fitting is such that the front cover 2 can be rotated by applying a slight force. A retaining protrusion 8 is provided on the tapered inner surface of the peripheral wall portion of the IjIIfi cover 2, and is fitted into an engaging groove 9 on the front outer periphery of the case l. Front cover 2Fi has a time display scale of 2m on the outer or inner surface,
It also serves as a temporary character. Fixed teeth 1110 having 11 teeth are integrally formed in the center of the inner surface of the front cover 2. Reference numeral 11 denotes a nameplate attached to the center of the outer surface of the front cover 2, which hides the fixed wheel 10, hour wheel 7, etc. The minute wheel 6 has a shaft 1tf11. which moves up and down ***<-. ,'r-*
1 & Jr.) Companion bearing hole 12 provided in Mill cover 2
．． It is rotatably supported by 13. The minute hand wheel 6 has an eccentric cam 14 at the center of the front surface, and an internal gear 15 at the outer periphery of the rear surface. tC1 Front of minute hand wheel 6 (minute hand display 1
6 is printed. The outer diameter of the minute wheel 6 is approximately the same as the inner diameter of the front cover 2. Hour hand wheel 7 is hour hand 17
It has a cam hole 1st in the center that engages the eccentric cam 14 of the minute hand *6, and an internal gear 19 that meshes with the fixed teeth *10 of the front cover 2 on the outer periphery. There is.

The internal gear 19 has 12 teeth and is formed coaxially with the cam hole 18 . The transmission gear 5 is integrally provided with the case 1 and rotatably supported by nine supporting shafts 20, and is connected to an internal gear 15 of the minute hand 6 and a drive chain wheel 22 provided on the rotor 21 of the motor 4. They mesh together.

That! Reference numeral 4 indicates a cylindrical shape, which is inserted 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 with respect to the case IK. The motor 4 has a support shaft 23 protruding from an end surface, and a rotor 21 is rotatably engaged with the support shaft 23 by Km. The rotor 21 is arranged coaxially with the minute wheel 6. motor 4
has a built-in coil 25 and an oscillator module 26, and is fixed to the end face of the motor case 27 and connected to the friend negative terminal plate 2.
8 and the positive terminal plate 29 (8
) The trochanter 21 rotates in one direction. 30 is a battery, which is formed to have approximately the same diameter as the motor 4. The battery 30 is the motor 4
It is housed in the case 1 with one side in contact with the negative terminal plate 28 and the outer peripheral surface in contact with the positive terminal plate 29 . back! [13
There is a battery 30t and a presser plate 31 pressed against the negative terminal plate 28.
is provided.

The back cover 3 is detachably attached to the case 1 using a screw type or elastic fitting type attachment structure. 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, from the back of case 1, motor 4f7! : Insert the battery, then insert the battery 30, and then
Fit i3. From the front side of case l, transmission gear 5
, then insert the minute wheel 6t-, and place the hour wheel 7 on top of the minute 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. The rotation of the rotor 21 is transmitted to the minute wheel 6, and the number of teeth on each gear 5, 15, 22 and the motor 4 are adjusted so that the minute wheel 6 rotates once per hour.
The rotation speed is set.

For example, if the motor 4 is a step motor with 16 poles and driven by one pulse every 30 seconds, the rotation of the rotor 21 - the number of both wheels 22 (t8), and the internal teeth (5) of the minute hand wheel 6. In other words, it rotates 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 rate of one rotation. Time adjustment is performed by fixing the front force 2 and rotating the case 1 at 9 feet. At this time, the fixed gear 10 of the front cover 2
Since the internal gear 19 of the hour hand wheel 7 is in mesh with the case 1, the hour hand wheel 7 rotates by an appropriate angle K(2) as the case 1 rotates, and the time is set.

The hands are moved and the time is set 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 hour hand has a minute wheel 6 with a minute hand indication 16 and an hour hand 17. 7, and the minute hand 1i,
Since the hour hand wheel 7 is driven by the eccentric cam 14 provided at the cam 6 and the fixed gear lO of the m-plane cover 2, the number of parts is small and assembly is simple. In addition, a time display scale 2a is provided on the front cover (6) 2, and a fixing 110 provided on the front cover 2 regulates the rotation of the hour hand wheel 7, thereby controlling the relative rotation angle between the front cover 2 and the case 1. There is no need to separately provide means for rounding and time adjustment, which adjusts the time by changing the time, and this also reduces the number of parts. Furthermore, the minute hand wheel 6 with a one-minute display wheel 16 is used, and the driving means for the transmission gear 5 is hidden by this minute hand wheel 6. Also, the front cover 2 is provided with a time display scale of 2 m, so a dial plate is not required. This also reduces the number of parts. In addition, since the time display scale 2at- is provided on the 1Ij 1 side cover 2, the overall outer diameter can be made approximately the same diameter as the minute wheel 6, and therefore the display can be made in proportion to the size of the front surface of the front cover 2. It can be made larger.

In addition, in the ltI Kiryo example, the number of strokes f of the internal gear 19 of the hour hand wheel 7 is 12, and the number of teeth of the fixed gear 10 is ft11, but the IvI number of the internal gear 19 is 12xfl (n is an integer).
The number of teeth of the fixed gear 10 may be t''1lXn.As described above, the watch of the present invention includes a case, a case attached to the front surface, and an inner surface having a number of teeth of 1lXn (U is an integer).
A transparent cover having a fixed transparent cover, a minute wheel rotatably held between the cover and the case and having an eccentric cam at the center of the front surface, and a minute wheel between the minute wheel and the cover. The minute hand wheel has a cam hole tube arranged to play with the eccentric cam, and the number of teeth meshing with the fixed gear is 12×.
Since it has n internal gears concentrically with the cam hole, the structure is simple, the number of parts is small, and assembly is easy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, Fig. 4 is a rear view thereof, and Fig. 5 is a general public record thereof. FIG. 6 is a partially exploded perspective view, and FIG. 7 is a sectional view showing the relationship between the hour hand wheel and the fixed gear. l...Case, 2...Front cover, 4...Motor, 5...Transmission gear, 6...Minute wheel, 7...Hour hand wheel, lO...Fixed gear, 14...・Eccentric cam, 15...
・Internal gear, 16...Minute hand display, 17...Hour hand, 1
8...Cam hole, 19...Internal tooth painter, 21...Rotor, 30...Battery (9 units)

Claims (3)

[Claims] (1) A case, a transparent cover that is attached to the front of the case and has a fixed gear with 1xn teeth (n is an integer) on its inner surface, and is rotatably held between this cover and the front six cases. A minute wheel having an eccentric cam at the center of the front surface, and a cam hole disposed between the minute wheel and the cover to play with the eccentric cam of the minute wheel and mesh with the fixed foot wheel. A clock with 12 x n internal teeth concentrically with the cam hole. (2) A time display scale or a red letter is provided on the front ε cover, the outer diameter of the minute hand wheel is made approximately equal to the inner diameter of the cover, an internal gear is provided on the back surface of the minute hand wheel, and The hour hand according to claim 1, further comprising a transmission gear which is driven by a motor and meshes with an internal gear on the back side of the front distribution needle wheel. (3) The cover t-nf! The timepiece according to claim 2, wherein the timepiece is rotatable with respect to the case, and the time can be set by changing the relative rotational position of the cover with respect to the case.