JPS5922552Y2 - Clock second hand synchronization mechanism - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of the second hand synchronization mechanism in an analog electronic watch that has a digital clock part in order to improve the accuracy of the guide. This invention relates to a second hand synchronization mechanism that synchronizes the second hand and digital timekeeping section.

In recent years, analog clocks have been designed to include a digital clock section in order to improve the accuracy of the reference time.

FIG. 1 is a block diagram of this.

In FIG. 1, a crystal oscillation circuit 1, a frequency divider 2, a waveform shaping circuit 3, a drive circuit/motor 4, a wheel train 5, and a reference contact device 7
, the notification circuit 8 is the basic structure of the crystal oscillation type analog clock.

In the above configuration, the standard time accuracy is determined by the positional accuracy of the wheel train, and it is difficult to set it to ±30 seconds or less.

Therefore, the accuracy of the guideline was improved by adding a second counter 6.

The second counter 6 is a 60 second counter that counts based on the signal from the frequency divider 2, and from the time when the reference signal from the reference contact device 7 and the output from this second counter 6 match, a signal is sent to the notification circuit 8. By outputting , the standard time accuracy will have an error of 0 seconds.

In this case, the most important thing is to
6 and the display section of the wheel train 5.

If this period is not maintained, the approximate time accuracy will be ±
That means 1 minute.

Conventionally, in order to obtain this synchronization, an external switch 9 in FIG.
It was possible to synchronize with gear train 5 by manually inputting a reset signal.

However, with this configuration, the user has to wait until the second hand reaches the 0 second position, making the operation difficult.

Therefore, it has been proposed in the past that when the power is turned on, the user operates a switch to reset the pointer to zero and at the same time reset the counter.

However, it is very cumbersome for the user to operate an external switch every time the power is turned on.
Improvement was desired.

The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to simplify the operation of matching the analog display section and the digital timekeeping section.

In order to achieve the above object, the present invention is characterized in that when the user turns on the power, the digital timer is reset, and in conjunction with this turning-on operation, the seconds reset lever is moved to perform seconds reset. do.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram of an electronic timepiece showing an embodiment of the present invention.

The crystal oscillation circuit 1, frequency divider 2, waveform shaping circuit 3, drive circuit/motor 4, wheel train 5, second counter 6, reference circuit 7, and notification circuit 8 are the same as those shown in FIG.

Battery case contact 10, second hand zero return mechanism 12, battery case 1
1 functions to return the second hand to zero with respect to the wheel train 5 when the battery is inserted.

The reset circuit 24 is composed of Nant gates 13, 14, 15, resistors 16, 17, and capacitors 18, 19,
This circuit resets the second counter 6 and frequency divider 2 at the same time as the battery is turned on by a signal from the battery case contact 10.

The operation will be explained below.

When a battery is inserted into the battery case 11, the signal on the output line 20 of the battery case contact 10 becomes H.

This H signal is applied to the plane input of the Nandt gate 13 through a differentiating circuit constituted by the capacitor 18 and the resistor 16, so the output line 21 of the Nandt gate 13 is connected to the resistor 16, the capacitor 18, and the Nandt gate 13. A single negative pulse with a pulse width set at the threshold level is obtained.

This negative single pulse is applied to one input of the Nandt gate 14.

A signal from the output line 22 of the Nant gate 15 is applied to the other input of the Nant gate 14.

In this state, an H signal is always applied to one input of the Nant gate 15, and the signal of the output line 23 of the Nant gate 14 is applied to the other input of the differential circuit composed of the capacitor 19 and the resistor 17. It is applied via.

Therefore, in a normal state, the signal on the output line 23 of the Nandts gate 14 is L, so the signal on the output line 22 of the Nandts gate 15 is H.

Therefore, when a single negative pulse on the output line 21 is applied to one input of the Nant gate 14, the Nant gate 1
The signal on the output line 23 of No. 4 changes from L to H.

This H signal is applied to one of the Nant gates 15 via a differentiating circuit composed of a capacitor 19 and a resistor 17.

As a result, the output line 22 of the Nant gate 15 has a resistor 17,
A negative single pulse whose pulse width is set by the time constant of the capacitor 19 and the threshold level of the Nandt gate 15 is obtained.

A negative single pulse on output line 22 is applied to one input of Nant gate 14.

The pulse width of the negative single pulse on output line 22 is
Since the pulse width is set to be larger than the pulse width of the negative single pulse generated in 1, the signal on the output line 23 remains H while the negative single pulse on the output line 22 is applied to the Nant gate 14.

When the signal on the output line 22 changes from L to H, the signal on the output line 23 of the NAND game 1-14 rises from H to L.

As a result, a positive single pulse is obtained on the output line 23 at the same time as the battery is turned on.

And this single pulse is transmitted to frequency divider 2 and second counter 6.
applied to the reset input of frequency divider 2, second counter 6
Clear the count contents.

After this, the frequency divider 2 and second counter 6 start counting again.

FIG. 3 is a time chart showing the signals in FIG. 2, and the numbers correspond to those in FIG. 2.

Figure 4 a, l) and c show battery 3 in battery case 11.
It is a diagram showing the process of inserting 0.

FIG. 4a shows a state in which the battery 30 is not inserted.

A negative electrode spring 32 and a positive electrode plate 38 are attached to opposing wall surfaces of the battery case, and a protrusion 40 is provided on the upper part of the wall surface on the positive electrode plate 38 side.

A hole 44 is bored in the wall inside the negative electrode spring 32, and one end of the zero return lever 34 protrudes.

A spring 36 is wound around the zero return lever 34, and in this state, the zero return lever 34 is held in a fixed position by the urging force of the spring 36 and the negative electrode spring 32.

FIG. 4 is a diagram showing the state when the battery 30 is inserted.

Due to the protrusion 40 on the top surface of the battery case 11, the battery 30 must be inserted with the negative electrode first at a slight angle.

For this reason, the negative electrode spring 32 is closed. The tongue 36 is pushed by the negative electrode of the battery 30 and contracts, which causes the zero return lever 34 to
One end also moves in the thrust direction.

FIG. 4C is a diagram showing the state when the battery 30 has been inserted.

In this state, the battery 30 is pushed by the biasing force of the negative electrode spring 30, and the positive electrode of the battery 30 comes into contact with the positive electrode plate 38.

Further, the spring 36 also extends due to its biasing force, and returns one end of the zero return lever 34 to its home position.

FIG. 5 is a diagram showing the second return mechanism 12 in the state shown in FIG. 4.

The zero return lever 34 is formed in a U-shape, and the mechanism receiving plate 4
It is movably arranged in holes 44, 46 formed in 2.

One end of the zero return lever 34 is inserted into the battery case 11 as described above, and the other end is formed in an L shape and engages with the operating portion 50 of the regulating body 48.

One end of a coil spring 54 wound around a pin 52 is engaged with the operating portion 50 of the regulating body 48 .

The other end of this coil spring 54 is engaged with a pin 56.

The regulating body 48 is pivotably supported by a pin 58 and held in position by a coil spring 54 and a zero return lever 34.

Further, 60 is a heart cam, which is fixed to the fourth true position.

Here, as shown in FIG. 5, the battery 30 is inserted into the battery case 11.
When inserted, the zero return lever 34 is moved in the thrust direction by the battery 30, and the regulating portion 62 of the regulating body 48 presses the heart cam 60.

As a result, the heart cam 60 rotates appropriately, and the seconds return to zero.

FIG. 6 is a diagram showing the second return section 12 in a state in which the battery 30 of FIG. 4C has been inserted.

When the battery 30 is completely inserted, the biasing force of the spring 36 causes the zero return lever 34 to return to its original position.

As a result, the regulating body 48 is also returned to its normal position by the biasing force of the coil spring 54, and the regulating portion 62 is separated from the heart cam 60, and the return to zero is canceled, so that the second hand begins to move.

At the same time, the signal at the battery case contact 10 changes from L to H, and the reset circuit 24 outputs a heliset signal for the frequency divider 2 and second counter 6.

As a result, the frequency divider 2 and the second counter 6 are set to the initial state at the same time as the seconds return to zero operation, and counting is started anew.

As described above, according to this embodiment, the second hand returns to zero when the battery is inserted, and at the same time as the battery is completely inserted, the frequency divider 2 and the second counter 6 return to the initial state and start counting anew. The second hand also starts moving from 0 seconds.

As a result, the analog display time and the period of the digital clock inside the watch can be perfectly matched, further improving the accuracy of the guide.
In addition, there is no need to provide or operate an external switch as in the past.

As described above, according to the present invention, complete synchronization between the analog display time and the digital timekeeping section inside the watch can be achieved with only the relatively easy and necessary operation of inserting a battery.

As a result, you can obtain a standard accuracy of 0 seconds without waiting for the second hand to reach 0 seconds and pressing an external switch as in the past, and the result is great.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional example. FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a time chart thereof. Figures 4a, l) and c are diagrams showing the battery insertion operation. FIG. 5 is a diagram showing the second hand zero return mechanism when a battery is inserted. FIG. 6 is a diagram showing the second hand zero return mechanism when the battery has been inserted. 1... Crystal oscillator, 2... Frequency divider, 3
...Waveform shaping circuit, 4...Drive circuit・
Motor, 5... Gear train, 6... Second counter, 7... Reference contact device, 8... Notification circuit, 24...・Reset circuit, 10...
...Battery case contact, 12...Second hand zero return mechanism,
34...Return lever 48...Regulator,
60...Heart cam.

Claims (1)

[Scope of utility model registration request] Oscillator, frequency divider, waveform shaping circuit, drive circuit, motor, gear train, reference contact device, alarm circuit, power battery, second counter that counts seconds, frequency divider and second counter when the power battery is turned on. An analog display type electronic watch including a reset circuit that resets the second hand and a second hand zero mechanism that returns the second hand zero lever to zero.
One end of the battery case is wound with a spring and protrudes into a hole drilled in the negative spring of the battery case that houses the battery, and the other end is L-shaped and provided with a mechanism receiving plate. The second return lever is engaged with an operating portion of a regulating body that is swingably supported by a pin, and when the power battery is inserted into the battery case, the second return lever is moved in the thrust direction by the power battery. A second hand synchronization mechanism for a timepiece, characterized in that the regulating portion of the regulating body presses a heart cam fixed to the fourth stem to cause the second hand to return to zero.