JPH0530236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pointer-type electronic timepiece with an added chronograph function, and more specifically to stopping and returning each pointer of a chronograph to zero.

[Background of the invention]

The recent development of electronic watches has been remarkable, and in particular, it has become common to add a chronograph (stopwatch) function to digital watches, and they are even becoming popular products. Furthermore, in the market, there is an increasing demand for wristwatches with chronographs as well as pointer display type electronic watches.

[Prior art and problems]

Various attempts have been made to add a chronograph mechanism to pointer display type watches. FIG. 2 is a block diagram showing the relationship between the external operating members and the wheel train of a conventional pointer display type timepiece with a chronograph mechanism added. The rotation of the motor 20 is decelerated by the second wheel train 21 and the second hand 2
2. The hour and minute hands 23 are further decelerated by the hour and minute wheel train 33.
The time is normally displayed.

Next, the chronograph mechanism consists of the second wheel train 21 and the CG
A disconnection mechanism 30 operated by an external operating member 34 between the second hand 24, CG minute hand 25, and CG hour hand 26 disconnects the power transmission from the wheel train of the normal time display.
CG second train 64, CG minute train 31, CG hour train 32
Each CG needle 24, 25, 2 is moved by each slip return mechanism 27, 28, 29 consisting of a heart cam etc.
This is to stop the display of number 6 and return the needle.

In such a structure, there is no major problem with the hour hand shaft and minute hand shaft, but providing the aforementioned mechanical slip return mechanism and disconnection mechanism on the second hand shaft, which has weak rotational torque, requires parts with strict precision. In addition, it also has the drawbacks of being thicker structurally and increasing costs. Furthermore, recent electronic watches have become smaller in size and thickness, and increasing the torque of the second hand shaft to the same level as a mechanical watch requires a correspondingly large amount of energy. This requires a large capacity battery, which increases the size and thickness of the watch, making it extremely unsatisfactory for current electronic watches.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks, achieves thinner and smaller size even with the addition of additional functions such as a chronograph mechanism, and at the same time reduces costs by reducing the number of parts, making it easier to see and operate. It attempts to provide a simple structure.

[Structure of the invention]

The configuration of the present invention for achieving the above object is as follows:
This is an electronic watch in which the second hand driven by the second wheel drive motor switches between normal time and chronograph time to display the hand, and the rotation is transmitted by decelerating from the second wheel.
It has at least a CG minute wheel, and a mechanical slip return mechanism is provided between the CG minute gear and the CG minute shaft,
The CG minute gear and seconds wheel are always kept in mesh with each other, and when the seconds wheel is in the normal time display state, the CG minute shaft is configured to slip and remain stopped by a slip return mechanism.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a plan view showing the appearance of an electronic timepiece with a pointer display type chronograph according to an embodiment of the present invention.

In the figure, 1a and 1b are hour and minute hands that display two times, the normal time and the alarm time, and 2 is the normal time.
CG time 2 is the second hand that displays the seconds of the time, 3 is the CG hour hand that displays the hours of the CG time, and rotates once every 12 hours.
4 is the CG minute hand that displays the minutes of the CG time and rotates once every 60 minutes. 5 is CG2/1 which displays 2/100 seconds of CG time
The 00 second hand makes one revolution in 50 steps per second. Also CG
The 2/100 second hand 5 also displays the remaining time of the timer, and the timer can be set for a maximum of 49 minutes, with each division being 1 minute. 6,7,
8, 9, and 10 are external operating members, and 6 is a button for performing the start/stop function of the CG and timer (hereinafter referred to as the start/stop button);
7 is a button for returning to zero for the CG and setting the timer (hereinafter referred to as the set/reset button); 8 is a button for switching between normal time and CG time (hereinafter referred to as the switching button); 9 is a button for It is reused and can be adjusted by turning the hour and minute hands 1a and 1b to the normal time by pulling it out to the left and right by two steps, and by pulling it out by one step to adjust the hour and minute hands 1.
You can change the display to the alarm time of a and 1b and adjust the alarm reference time by rotating left and right. 10 is an alarm button for switching the alarm ON/OFF.
The alarm is now set to ON (waiting to sound).

To explain the operating operation, when the Reuse 9 is in the 0 step (pushed) position in the normal use state, the hour hand 1a, the minute hand 1b, and the second hand 2 normally indicate the time.
When using CG, press the switching button 8 once. Then, the second hand 2 is electrically fast-forwarded at 64Hz and returns to the 0 second position, entering chrono mode. Then, when the start/stop button 6 is pressed, the CG2/100 second hand 5 starts moving in 2/100 second steps. Then, every time the CG2/100 second hand 5 rotates once, the second hand 2 moves in 1 second steps as a CG second hand. Then, as will be described later, the CG minute hand 4 and CG hour hand 3, which are interlocked with the second hand 2 through the gear train, also start moving in 1-second steps, making one rotation in 60 minutes and 11 rotations in 12 hours, respectively. When the timing is finished, press the start/stop button 6 to start each CG hand 2,
3, 4, and 5 stop, so you can know the elapsed time by reading each pointer at that time. To continue counting the time, by pressing the start/stop button 5 again, the integrated time can be counted in the same manner as described above.

On the other hand, if you want to start counting again from 0 seconds, press the set/reset button 7 while each CG hand is stopped, and the CG hour hand 3 and CG minute hand 4 will instantly return to zero, and the second hand 2 and CG2/100 second hand will return to zero. 5 returns to zero at 64Hz fast forward and waits for the CG to be reused. In this state, press and operate start/stop button 6.
By operating the CG, you can measure the next time.

When the use of the CG is completed, press the changeover button 8, and the CG minute hand 4 and CG hour hand 3 will instantly return to zero, and the second hand 4 will be fast-forwarded at a rate of 64Hz to the second display position of the normal time, and from then on The second hand is used to display the seconds of the normal time. Note that this switching to the normal time can be done either while the CG is in operation, that is, while counting time, or even when it is stopped.

Next, in the normal time display state, the timer can be set by pressing the set/reset button 7, and the timer is displayed using the CG2/100 second hand 5. That is, each time the set/reset button 7 is operated, the timer is set in steps of 1 minute, making it possible to set the timer for 49 minutes in total. After setting the timer to a certain time, the timer starts counting by pressing the start/stop button 6, and the timer advances one step every minute, and when the time is up, it emits an alarm. Furthermore, even if the timer is set, if the start operation is not performed, the CG2/100 second hand 5 will remain stopped. Furthermore, instead of using the CG2/100 second hand 5 as a timer, by pressing the set/reset button 7 once, it can also be used as a simple 50-decimal counter that counts by one. Further, once the timer has started, new settings are prohibited no matter how many times the set/reset button 7 is pressed, so that malfunction of the timer does not occur.

Next, when the reuse 9 is pulled out one step with the alarm button 10 in the Pull state, the hour hand 3 and minute hand 4 switch to the alarm time at a fast forward speed of 128 Hz, and display the alarm reference time. In this state, by rotating the reuse 9 in forward and reverse directions, it is possible to set an arbitrary new alarm time. After setting the alarm time, when the watch 9 is pushed in to display the normal time, the hour hand 3 and minute hand 4 switch to the current time display at a reverse rotation rate of 64 Hz. And alarm ON/OFF
If the button 10 is in the pull state, an alarm sound will be emitted when the reference time is reached, and if it is in the push state, the alarm sound will not be emitted because the sound is stopped. When using the CG or timer, select, set, or use the switch button 8.
Reset button 7, start/stop button 6
The alarm is operated by the reuse 9 and the alarm button 10, and since they can be operated independently of each other, the user has no restrictions on the order of operations, etc., and can satisfy a wide variety of functions with simple button operations. be able to.

FIG. 4 is a block diagram of essential parts of a timepiece system according to an embodiment of the present invention. Reference numeral 12 denotes a reference oscillator composed of a crystal resonator, an oscillation circuit, etc., and its output signal is divided into signals of appropriate frequencies by a frequency divider 13. On the other hand, the output signal from the frequency divider 13 passes through a motor drive circuit 14, a motor 15, and a wheel train 16, and displays the normal time on the hands of a display device 17, just like a normal hand display type electronic watch. The other output signal from the frequency divider 13 is the counter circuit 1
8 and communicates signals with each other. 11 is the first
This is a group of external operation members including the push buttons 6, 7, 8, 10 and the reset button 9 shown in the figure, and the wheel train 16 and the switch control circuit 19 are controlled by their operation. The counting circuit 18 is controlled by the output of the switch control circuit 19.

FIG. 3 is a main part block diagram illustrating in detail the relationship between the external operating member group and the wheel train.

The motor 15 has an hour and minute gear train 35, an hour and minute hand 1
Second motor 150 (described later) that drives a and 1b
, a second wheel train 36, and an hour/minute motor 160 (described later) that drives the second hand 2.
6 is a CG minute wheel train 37 which, in the CG state, drives the CG minute hand 4 in addition to driving the second hand 2;
It is adapted to drive a CG hour wheel train 38 that moves the CG hour hand 3.

In this state, by operating the external operating member group 11, the CG minute wheel train 37 and the CG minute hand 4 are provided with a CG minute return mechanism 39, and the CG hour wheel train 38 is activated.
A CG hour return mechanism 40 provided between the CG hour hand 3 is operated to control the CG minute hand 4 and the CG hour hand 3.

FIG. 5 is a plan view of an electronic timepiece according to an embodiment of the present invention, FIG. 6 is a sectional view of essential parts of the CG minute train, the CG return mechanism, and the CG hour train, and FIG. FIG. 3 is a cross-sectional view of essential parts of the wheel train and the hourly train. The second motor 150 includes a second motor coil 151, a second motor stator 152, and a second motor rotor 153. The rotation of the seconds motor rotor 153 is decelerated by the intermediate seconds wheel 141, which rotates the seconds wheel 42 to form the seconds wheel train 36, and drives the second hand 2 fixed to the seconds wheel 42 to display the seconds time. are doing. The second motor rotor 153 and second intermediate wheel 41 are both mounted on the main plate 3.
01 and is pivotally supported by a train wheel bridge 307.

The hour and minute motor 160 is composed of an hour and minute motor coil 161, an hour and minute motor stator 162, and an hour and minute motor rotor 163.
The fifth wheel & pinion 43 is supported by the train wheel bearing 307, and the fourth wheel & pinion 4 is supported by the middle bearing 303 and the main plate 301.
4, a third wheel 45, a minute wheel 46 that supports the minute hand 1b, a sun wheel 47, and an hour wheel 4 that supports the hour hand 1a.
A time/minute wheel train 35 is constituted by a reduction wheel train consisting of 8 and 8.

Moreover, as shown in FIG. 6, the second wheel 42 mentioned above is
The pinion part of the seconds wheel 42 is connected to the CG minute gear 50 via the CG minute intermediate wheel 49 so as to be driven in the mode.
A CG segment wheel train 37 is configured to drive a CG segment shaft 55. Further, the pinion portion of the seconds wheel 42 constitutes a CG hour wheel train 38, which is the other deceleration wheel train. That is, from the seconds wheel 42 to the CG time first intermediate wheel 51, the CG second intermediate wheel 52, and the CG third intermediate wheel 5.
A CG time wheel train 38 is formed which extends through 3 to a CG time gear 54, and is capable of driving a CG time shaft 59.

Each of the above-mentioned CG gear trains is supported by a chronograph bridge 306 and a gear train bridge 307, and can be freely attached or detached depending on the presence or absence of the chronograph function.

As shown in Fig. 6, the CG minute wheel and hour wheel have their respective gear parts and the CG minute axis and CG hour axis 55, 59 for press-fitting the CG minute hand and CG hour hand 4, 3. They constitute return mechanisms 39 and 40. This return mechanism will be explained in detail using a CG minute wheel.
The wheel train from the seconds wheel 42 to the CG minute intermediate wheel 49 and the CG minute gear 50 always rotates in synchronization with the seconds wheel 42 at a constant reduction ratio. CG minute gear 50 is CG minute gear seat 5
7 and is loosely fitted to the CG minute shaft 55 to prevent the CG minute gear 50 from swinging relative to the shaft.

Also, a heart-shaped heart cam 56 as shown in FIG. 5 is press-fitted to the CG shaft 55.
A slip plate spring 58 having a certain degree of deflection is inserted between the CG gear 50 and the heart cam 56. The heart cam 56 has the CG minute hand cam return portion 2 of the double hand transmission lever 280 on the same surface when viewed in cross section.
80a is adapted to engage with the heart cam 56 by the operation of the external operating member group 11. As shown in FIG. 6, when the CG minute hand cam return portion 280a of the double hand transmission lever 280 is not engaged with the heart cam 56, the CG minute shaft 55 is 1/6 of the second wheel 42.
It is rotating with a reduction ratio of 0. As shown in Figure 5,
When the CG minute hand cam return part 280a engages with the heart cam 56, the heart cam 56 is returned to a stable position (0 minute position) by the CG minute hand cam return part 280a, and the CG minute shaft 55 is therefore rotated and the CG minute hand 4 will also return to the 0 minute position.

However, when viewed from the CG gear 50, the CG minute intermediate gear 4
9. A speed-increasing gear train extends through the seconds wheel 42 and intermediate seconds wheel 41 to the seconds motor rotor 153. In this case, when the heart cam is forcibly rotated, the slip spring 5
Depending on the frictional force of 8, the CG minute shaft 55 and the CG minute gear 5
0 is a slip and the aforementioned speed increasing gear train does not rotate,
The CG minute gear 50 is rotating in synchronization with the seconds wheel 42. The rotational speed of the second motor rotor 153 of the second motor 150 is reduced by the CG minute gear 50, and the rotational force is conversely amplified, and the rotational force of the CG minute gear 50 is approximately 3 g-cm. It's becoming like that. Therefore, by setting the slip leaf spring 58 so that the rotational slip force between the CG minute gear 50 and the heart cam 56 is about 0.4 to 0.8 g-cm, the CG minute gear 50 does not rotate due to the forced rotation of the heart cam 56. It is possible to do so.

Conversely, if the rotational slip force is set to 0.4 g-cm or less, the slight unbalanced weight of the CG minute hand 4, heart cam 56, etc. will cause the CG minute gear 50 and CG minute shaft 55 to slip when an external impact such as a drop of the watch occurs. This will cause the minute hand 4 to shift.

The CG time reversing mechanism 40 is the same as described above.
CG time shaft 59, heart cam 60, slip plate spring 62, double-travel lever 280, and CG time return section 2
80b, and its operation is exactly the same as that of the CG return mechanism 39. In this case, the CG hour gear 54 is further decelerated by about 12 times by the CG minute gear 50, and the rotational force is about 3 x 12 = 36g-cm, and when the slip rotational force is 0.4 to 0.8g-cm, the second motor 150 There is no impact on

As mentioned above, the CG minute and hour return mechanisms 39 and 4
0 has no effect on the seconds motor 150, and when the conventional return mechanism and disconnection mechanism are applied to the seconds wheel 42, the torque of the seconds wheel 42 is 3/60g-cm=0.05g-cm. Therefore, 0.05g−cm
It is very difficult to provide the following return mechanism and separation mechanism in the second wheel 42, and it is necessary to create a more complicated structure.

In this way, a slip mechanism is provided between the CG minute gear 50 and the CG minute shaft 55, and between the CG hour gear 54 and the CG hour shaft 59, so that during normal timekeeping, the hammer is transmitted to the heart cam provided on each shaft. Elever 280
The rotation of the second wheel 42 is always transmitted to each gear 50, 54 by engaging and regulating the second wheel 42.
The CG minute hand 4 and the CG hour hand 3 are constructed so as not to rotate.

Next, the external operating member group 11 and the external operating member group 1
Each switch S ₁ 111, S ₂ 112 provided in 1
The relationship between the S ₃ 113 and the CG minute and hour return mechanisms 39 and 40 will be explained below. Fig. 8 is a plan view of the main parts of the external operation member group and each return mechanism in the normal time display state, Fig. 9 is a plan view of the state in which the switching button is pushed to switch to chronograph time display, and Fig. 10 is a plan view of the main part of the external operation member group and each return mechanism in the normal time display state. FIG. 11 is a plan view when the machine is started, FIG. 11 is a plan view when the hammer is hammered, and FIGS. 12 and 13 are sectional views of essential parts of the external operating member group.

As shown in FIG. 8, the external operation member 11 is provided with a switch that is turned on by pressing each push button, and an S-S switch S ₂ 112 is turned on when the start/stop button 6 is pressed and operated. , and when the set/reset button 7 is pressed and operated, the switch turns on.
-R switch S ₁ 111, and a changeover switch _S3 113 which alternately turns on and off each time the changeover button is pressed and operated.

When the aforementioned changeover switch S ₃ 113 is off, the second hand 2 normally displays the time status, and the second motor 150 is driven at 1 Hz. Press and operate changeover button 8 to changeover switch S ₃ 113
When turned on, the watch enters the chronograph time state, and the second motor 150 is driven at 64Hz and stops when the second hand 2 reaches the 0 second position. In this state, press and operate the start/stop button 6 and switch S-S switch S ₂ 112.
When turned on, the chronograph starts, the second motor 150 starts driving at 1Hz, and the second hand 2 moves to 1Hz.
Steps at Hz. Further, when the start/stop button is pressed and the S-S switch S ₂ 112 is turned on, the chronograph stops, the seconds motor 150 stops, and the second hand 2 stops.

When the set/reset button 7 is pressed and the S-R switch S ₁ 111 is turned on, the second motor 150 is driven at 64Hz, the second hand 2 stops at the 0 second position, and the CG second hand returns. I do.

When the changeover button 8 is pressed and operated to turn off the changeover switch S ₃ 113 during the above-mentioned chronograph start or stop, the seconds motor 150 is driven at 64Hz, and the seconds display pointer of the normal time is activated. At this position, the second hand 2 switches to normal second display. The aforementioned two times, the normal time and the chronograph time, are determined by the counting circuit 17 operated by each of the aforementioned switch operations.

In the normal time mode, the Fukuteden lever 28
The 0 cam return parts 280a and 280b regulate each heart cam as described above, the CG minute and hour hands 4 and 3 are regulated at the 0 position, and the second hand 2 is regulated at 1Hz.
The hands are moving normally. Fukushinden Elever 280
is designed to rotate around a tube 301c installed in the main plate 301, and its rotation is restricted by connecting a pin 280c provided on the chronograph lever 280 to a regulating spring portion 305 provided on the chronograph presser 305.
By pressing e, each heart cam 56,
60 is regulated to be pressed by the doubling lever 280. In this state, all switches S ₁ to _{S 3} are in an open state.

Next, press the switch button 8 as shown in Figure 9.
When pushed, the operating lever 120 moves to the base plate 301.
Using the pin 301b implanted in as a guide, the watch is moved toward the center of the watch. Note that the operating lever 120 has a return spring portion 30 provided on the chronograph pusher 305.
5a constantly exerts a force that returns the clockwise direction. Further, the operating lever 120 has an operating cam upper wheel 1.
A feed pawl 120a that engages with 21 is provided, and when the switching button 8 is pushed once, the operating cam upper wheel 121
is designed to rotate counterclockwise by one tooth. The operating cam upper car 121 is the operating cam lower car 122.
Because it is combined so that it becomes one with the
It rotates counterclockwise around a shaft 301a implanted in the base plate 301. The operating cam upper car 121 is 12
The lower gear 122 has six teeth, and with one stroke of the operating lever 120, the dismounting gear 122 is 1/2
Rotate in a pinch.

In addition, on the alighting 122, there is a pin 3 planted in the base plate.
The actuating cam lever 123, which is indicated by diagonal lines in FIG. 9 and whose rotation center is 01f, is always engaged, and the spring part 305d provided on the chronograph pusher 305 always exerts a pressing force toward the center 301a of the lower gear. I'm starting to work. For every push of the switching button 8, the operating cam lower gear 122 moves the operating cam lever 1.
23 is operated so as to alternately engage the ridges (tooth tips), troughs (tooth bottoms), ridges, and troughs.

Further, the operating cam lever 123 has a pin 123a.
is planted, and the position of the pin 123a is
The operating cam lower gear 12 is centered around the pin 301f.
It will alternately move between two locations determined by the tooth tip position and tooth bottom position. Further, a switch spring 124 that engages with the pin 123a is provided with the boss 124a as the center of rotation, and when the contact portion 124b comes into contact with a through hole pattern 304a provided on the circuit board 304, the switch S ₃ 11
3.

To explain the operation, from the normal time mode, when the switching button 8 is pushed and the operating lever 120 is made one stroke, the operating cam lower gear 122 rotates half a pitch, and the operating cam lever 123 rotates the lower gear 1.
22 changes from the tooth bottom position to the tooth tip position, the pin 123a of the operating cam lever 123 rotates clockwise, and the contact portion 124b of the switch spring 124 contacts the switch pattern 304a of the circuit board 304, and the switch S ₃ 113 becomes ON, and the second hand 2
is fast forwarded at 64Hz and stops at the 0 second position and enters chrono mode.

Next, in this state, press start/stop button 6.
When pushed, the start/stop lever 125 rotates clockwise around a shaft 301d implanted in the base plate, as shown in FIG. The start/stop lever 125 further includes a tip portion 125a that engages with the start/stop transmission lever 126 shown diagonally in FIG. 10, and a chronograph pusher 305.
A tip portion 125b is provided that engages with a switch spring portion 305b provided in the switch spring portion 305b.

The above-mentioned start/stop transmission lever 126 is a lever whose rotation center is a pin 123a provided on the above-mentioned operating cam lever 123, and one end is connected to the start/stop transmission lever 12.
5, and the other end is provided with portions 126a and 126b that engage with the doubling lever 280, respectively, and when the start/stop lever 125 rotates, the engaging portion 126
a is rotated counterclockwise. Further, due to the rotational operation of the engaging portion 126b at the other end, the double-travel lever 280 is rotated clockwise. By separating both cam engaging parts 280a and 280b of the double hand transmission lever 280 from both heart cams, the CG minute, hour hand 4,
3 rotates at a constant reduction ratio with the second wheel 42. Furthermore, the other end 12 of the start/stop lever 125
5b, the circuit board 30 is pressed by pressing the switch spring 305b provided on the chronograph pusher 305.
The switch S 2 112 is turned on by contacting the through hole pattern 304b provided in the switch S ₂ 112 .

The start/stop lever 125 is always returned to its original position by a spring portion 127a of a lever return spring 127 provided below, and returns to its normal state when the start/stop button 6 is released.

To explain the operation, when the start/stop button 6 is pushed in the chronograph mode, the start/stop transmission lever 12 is rotated by the rotation of the start/stop lever 125.
6, the double hand transmission lever 280 rotates the CG minute and hour hands 4 and 3 in synchronization with the seconds wheel, and when the switch S ₂ 112 is turned ON, the second hand 2 is set to 1.
Start the second hand movement, CG second hand 2, CG minute hand 4,
The CG hour hand 3 will be displayed as a chronograph. Next, press start/stop button 6.
When pushed, only the S-S switch S ₂ 112 operates, and the aforementioned start/stop lever 125 and start/stop transmission lever 1
26 operates, but the double transmission lever 280 remains in a position where it does not engage with the heart cam described above.

Because the pin 280c of the Bakushinden lever 280
This is because the movement is held by the spring part 305e of the chronograph presser. At this time, S-S switch S ₂ 112
As mentioned above, the stop state occurs due to the operation of .

Next, as shown in Fig. 11, regardless of whether the chronograph is starting or stopping, the
When the reset button 7 is pushed, the hammer lever 128 shown by diagonal lines in FIG.
Rotate clockwise around 01e as the rotation center. The hammer lever 128 has one end 128a that engages with the hammer transmission lever 280 and one end 128 that presses a switch spring portion 305c provided on the chronograph presser 305.
The heart cams 56, 60 are press-fitted into the hour shafts 55, 59 by the cam engaging portions 280a, 280b by rotating the doubling lever 280 counterclockwise with one end 128a.
will be returned to the 0 position, and the CG minute and hour hands will return to the 0 position.

Further, the other end 128b of the hammer lever 128 connects the through hole pattern 304c provided on the circuit board 304 and the switch spring portion 3 of the chronograph presser.
S-R switch S ₁ 111 is activated by contact of 05c.
The second hand 2 returns to the 0 position and stops as described above. Furthermore, when the start/stop button 6 is pushed, the chronograph is restarted, and it goes without saying that each lever operates in the same way as the start operation described above.

In addition, in chrono mode, push the start/stop button 6 and set/reset button 7.
Regardless of the operation, press switch button 8.
When pushed, one end 120b of the actuation lever 120
When the hammer lever 280 is engaged with the hammer lever 280, the hammer lever 280 is rotated in the same way as the hammer lever 128 is rotated counterclockwise.
If the hour hands 4 and 3 are not homered to the 0 position during chronograph operation, they are made to be homed.

Furthermore, the upper and lower gears 121 and 122 of the operating cam are rotated by the feed pawl 120a of the operating lever 120, and the operating cam lever 123 is returned to the tooth bottom position of the lower gear 122 of the operating cam, so that the pin 123a of the operating cam lever returns to its original position as described above. After returning to the normal time mode position, the switch spring 124 turns off the changeover switch S ₃ 113, and the second hand 2 twists to the normal time at 64 Hz and performs one-second movement. When the changeover switch _S3113 is in the OFF state, the start/stop button 6 is pressed as shown in Figure 8.
Even if you push and rotate the start/stop lever 125,
One end 125a thereof is connected to one end 12 of the start/stop transmission lever.
6a, and the start/stop transmission lever 126 and double travel transmission lever 280 do not operate. In this case, S-
Only the S switch S ₂ 112 operates and is designed to serve as a start/stop signal for the timer.

Similarly, when the changeover switch S ₃ 113 is in the OFF state, even if the set/reset button 7 is pushed and the hammer 128 is rotated, the hammer lever 280 and its engaging portion 128a are is not engaged because it is already in the heart cam pressing position which is the normal time mode position. In this case, the S-R switch S ₁ 111 is activated, and the timer is rotated in 1-minute increments or continuously depending on whether the push is 1 push or continues to push, and the CG2/100 second hand 5 is rotated to set the timer time. Also, even if you push the set/reset button 7 and advance the CG2/100 second hand 5, the start/stop button 6 will not be pressed.
It does not function as a timer unless it is pushed, and it can also be used as a simple 50-decimal counting device.

When the timer is not started only by setting the timer,
Also, regardless of whether or not the timer is starting, if you push switch button 8 to switch to chrono mode, the timer time will be canceled in the same way as 2/100 second hand 2, and CG2/100 second hand 5 will return to the 0 position, giving priority to chrono mode. To cancel the timer in the middle, press switch button 8 twice.
By switching from chrono mode (timer cancel) to normal mode (timer mode), it can be used as a zero reset for a timer or counting device.

Regarding the alarm structure, there is a reuse position selection switch provided on the reuse 9 and the winding stem 90, etc.
A selection switch for the reuse rotation direction and number, an alarm ON/OFF button 10, and an ON/OFF switch provided on the switch winding stem 100 are provided between the main plate 301 and the circuit board 304 on the upper side of FIG.
Based on the switch signal, setting of the reference time, normal time, and reference time is performed by the hour/minute motor 160, the hour/minute wheel train 35, and the hour/minute hands 1a, 1b.

〔Effect of the invention〕

As is clear from the above embodiments, according to the present invention, it is possible to display normal seconds and at least seconds and minutes of a chronograph with a single second hand motor, and the second hand has a small rotating torque. Since there is no need for a release mechanism or a return mechanism such as a heart cam, the structure can be simplified, and a return mechanism is provided for the chronograph minute hand axis, which has a large rotational torque, and a simple slip mechanism is required to connect it to the seconds axis. Since it can be connected and disconnected, it has become possible to provide a very inexpensive chronograph watch. In addition, since the second hand axis does not require a separation mechanism, the number of parts in the center of the watch is reduced, making it possible to make the watch thinner, making it more compact, and reducing costs. was completed.

[Brief explanation of drawings]

FIG. 1 is a plan view of a timepiece according to an embodiment of the present invention, FIG. 2 is a block diagram of essential parts of a conventional gear train,
FIG. 3 is a block diagram of the main parts of the gear train according to the embodiment of the present invention, FIG. 4 is a block diagram of the main parts of the timepiece system according to the embodiment of the invention, and FIG. 5 is a block diagram of the main parts of the timepiece system according to the embodiment of the invention. 6 and 7 are cross-sectional views of essential parts of the wheel train according to the embodiment of the present invention, and FIGS. 8 to 11 are operational diagrams of the external operation member group according to the embodiment of the present invention.
2 and 13 are sectional views of main parts of an external operating member group according to an embodiment of the present invention. 1a, b... Normal time (minute) hand, 2... Second hand (CG second hand), 3, 4... CG hour, minute hand, 5... CG
2/100 second hand, 6...start/stop button,
7... Set/reset button, 8... Normal time and CG time switching button, 11... External operating member, 12... Reference oscillator, 17... Counting circuit, 1
5...Motor.

Claims (1)

[Claims] 1. It has a reference oscillator, a frequency divider, a second wheel drive motor, and a counting circuit that measures the time signal from the frequency divider, and is fixed to the second wheel by controlling the counting circuit with an external operating member. An electronic timepiece in which the second hand switches between normal time and chronograph time to display a pointer, the electronic timepiece having at least a chronograph minute wheel to which rotation is transmitted by being decelerated from the seconds wheel, the chronograph minute wheel being A mechanical slip return mechanism formed by a regulated member and a regulating member is provided between the chronograph minute gear and the chronograph minute shaft, and the chronograph minute gear and the seconds wheel are always in mesh with each other. The electronic timepiece with a chronograph is configured such that when the second wheel is in a normal time display state, the chronograph minute axis is kept in a stopped state by slipping by the mechanical slip-returning mechanism.