JPH0449671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pointer-type electronic timepiece that does not require adjustment of the last day of the month of a small month such as February.

[Conventional technology]

Traditionally, in pointer-type electronic watches, a day wheel with numbers from 1 to 31 printed at equal intervals was used to mark one day a day.
The scale was rotated one by one. This date wheel rotated the hour and minute hands by decelerating the rotation of the step motor through a gear train, and then rotated the hour and minute hands while decelerating the rotation by another gear train.

[Problem to be solved by the invention]

However, in conventional pointer-type electronic watches, 2
At the end of a small month such as the month, the user had to turn the dial by hand to activate the date adjustment mechanism and rotate the date wheel until the next 1 was displayed. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pointer-type electronic timepiece that does not require adjustment of the date wheel at the end of each month.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a minute counter and an hour counter configured with the same frequency division ratio as the reduction ratio of the wheel train from the step motor to the indicating means, and a day counter that counts the carry of the hour counter. and a first counting circuit having a month counter that counts the carry of the day counter; and when the clock mode is set to month/day mode;
A day counter having a minute counter and an hour counter into which the counting result of the first counting circuit is written and having the same frequency division ratio as that of the first counting circuit, and counting the carries of the minute counter. and a month counter for counting the carry of the hour counter.
The configuration includes a counting circuit and a step motor drive control circuit that operates the step motor based on the counting results of the month and day information of the second counting circuit.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a reference signal for time measurement oscillated by an oscillation circuit 1 is output to a frequency dividing circuit 2. In FIG.

The signal frequency-divided by the frequency dividing circuit 2 is output to the control circuit 3. The control circuit 3 supplies a drive signal to the step motor 4 and also outputs signals to a first counting circuit 7, a writing circuit 8, and a second counting circuit 9. The step motor 4 is driven by a drive signal of, for example, a 20 second period from the control circuit 3, and rotates the wheel train 5. The wheel train 5 is, for example, 3 of the step motor 4.
It shall have a reduction ratio that indicates 1 minute on the hand 6 in rotation and 1 hour in 180 rotations.

The first counting circuit 7 has a frequency division ratio that is equal to the reduction ratio of the wheel train 5, and counts hours, minutes, months, and days using a clock pulse having the same cycle as the cycle that drives the step motor 4 from the control circuit 3. It is in. Further, the initial value of the first counting circuit 7 is set when the pointer 6 is at the 12 o'clock position. Therefore, the hour and minute data of the first counting circuit 7 is in a relationship that matches the time displayed on the hand 6.

The contents of the first counting circuit 7 are written to the second counting circuit 8 by the writing circuit 8 . The mode register 13 stores an hour/minute display mode and a month/day display mode in response to a signal from the input circuit 12.

Suppose now that the switch 11 is turned on and the contents of the mode register 13 change from the hour/minute display mode to the month/day display mode. Then, the second counting circuit 9 becomes
The control circuit 3 counts up the minutes and hours to the initial state at 32Hz, for example. At the same time, the control circuit 3 drives the step motor 4 until the hours and minutes of the second counting circuit 9 reach the initial state.

As a result, the position of the hand 6 at the time when the hour and minute data of the second counting circuit 9 becomes the initial state is 12 o'clock.

Next, the second counting circuit 9 counts down the month digit to zero by carrying the hour digit. During this time, the control circuit 3 drives the step motor 4, so that when the month digit reaches zero, the hour hand displays the month and the minute hand stops at the 12 o'clock position. Next, the second counting circuit 9
Count down the day digits to zero by carrying the minute digits. During this time, the control circuit 3 similarly drives the step motor 4, so that the minute hand indicates the day when the day digit reaches zero.

As a result, the hour hand displays the month, the minute hand displays the day, and the hour and minute hands stop.

In this state, when the switch 11 is turned on and the mode register 13 is changed from the month/day display mode to the hour/minute display mode, the second counting circuit 9 changes its own hour/minute digits and the hour/minute digits of the first counting circuit 7. For example, a 32 Hz signal from the control circuit 3 is used to count up until a match is detected by the match detection circuit 10. During this time, the control circuit 3 simultaneously drives the step motor 4, so that when the hours and minutes of the first clock circuit 7 and the second clock circuit 9 match, the positions of the hour and minute hands of the pointer 6 indicate the current time. I can do it.

Next, a more detailed embodiment of the second counting circuit 8 will be explained in the second section.
The present invention will be further explained with reference to the drawings.

FIG. 2 shows the write circuit 8, the second counting circuit 9, and the coincidence detection circuit 10.

First, if it is stable in hour and minute display mode, OR
The output of gate 8 ₂₈ is “0” (“0”: logic level,
“1”: logic level) and a signal b of, for example, 32Hz from a control circuit (not shown) is AND
It is blocked by gate ₈₆ . Therefore, the clock signal b from the control circuit is not input to the minute counter 9 ₁ , 10 minute counter 9 ₂ , hour counter 9 ₃ , day counter 9 ₄ , and month counter 9 ₅ that constitute the second counting circuit.

At this time, the operation of the write circuit 8 is controlled.
Since the output of the OR gate ₉₂₈ whose output is "0" is inputted to the input signal of the AND gate ₈₁ via the inverter 82, the AND gate ₈₁ receives the AND gate 828 through the inverter 82. The output of gate ₈₁ becomes "1". When the output of the AND gate ₈₁ is "1", the write circuit 8 is in a relationship to write the hour, minute, month and day data of the first counting circuit into the second counting circuit.

Therefore, if the output of the mode register is "1", that is, stable in hour and minute display mode, the second
1 minute counter 9 ₁ , 10 minute counter 9 ₂ ,
Hour counter ₉₃ , day counter ₉₄ , month counter ₉₅
, the contents of the first counting circuit are written at the cycle of the signal a from the control circuit.

Therefore, the current time is always written in the second clock circuit.

Next, in this state, when a mode change input e is received from the input circuit (not shown), the signal d from the mode register (not shown) changes from "1" to "0" at the falling edge of the mode change input. Changes to

Therefore, a pulse is generated at the output of AND gate ₉₂₂ . At the rising edge of this pulse, TF/F9 ₁₉
The Q output of becomes "1". As a result, the output C of OR gate ₉₂₈ becomes "1". As a result, AND
The gate ₉₆ outputs, for example, a 32 Hz fast forward signal from the control circuit to the one minute counter ₉₁ . 1 minute counter 9 ₁ carry is 10 through AND gate 9 ₇
The carry of the 10 minute counter ₉₂ which is input to the minute counter ₉₂ is further input to the hour counter ₉₃ .

Therefore, by the signal b from the control circuit,
Each counter counts up. The control circuit operates the step motor in synchronization with the count UP, and also rotates the pointer via the gear train.

The hour/minute zero detection ₉₁₀ detects zero of the one minute counter ₉₁ , the ten minute counter ₉₂ , and the hour counter ₉₃ .
1 minute counter 9 ₁ and 10 counter 9 ₂ and hour counter 9
The state where all ₃ 's are zero corresponds to the pointer's 12 o'clock position.

Therefore, when the hour and minute zero detections 9 _{and 10} detect a match, the hands are at the 12 o'clock position.

The output of the hour/minute zero detection ₉₁₀ becomes "1" when zero is detected. Hour/minute zero detection _9/10 output is “1”
Then, Q of TF/F9 ₁₃ rises to "1".

When the Q output of TF/F9 ₁₃ becomes “1”, AND
When the gate ₉₉ opens, the month counter ₉₅ is counted down by the carry of the counter ₉₃ . Month counter 9 ₅
January corresponds to one hour.

Therefore, when the zero of the 1 minute counter 9 ₁ , 10 minute counter 9 ₂ , and hour counter 9 ₃ is detected by the hour/minute zero detection 9 ₁₀ , the hands are at the 12 o'clock position, and then the hour counter 9 ₃ Carrier counts down the month counter 9 ₅ . When the contents of _the month counter ₉₅ become zero, the output of the month digit zero detection ₉₁₂ becomes "1".
Month digit zero detection 9 When the output of ₁₂ becomes “1”, TF/
The Q output of F9 ₁₅ becomes "1". When the Q output of TF/F9 ₁₅ becomes “1”, the output of AND gate 9 ₁₆ becomes “1” because the Q output of TF/F9 ₁₃ is also “1”.
become.

When the output of AND gate ₉₁₆ becomes "1", the AND gate that was blocking the input clock of day counter ₉₄
At the same time as gate ₉₈ is opened, the input clock of 10 minute counter ₉₂ is cut off by AND gate ₉₇ via inverter ₉₁₇ . As a result, the day counter ₉₄ is counted down by the carry of the minute counter ₉₁ until the content becomes zero. The zero of the day counter ₉₄ is detected by the day digit zero detection ₉₁₁ . Day digit zero detection 9
When ₁₁ detects zero, the Q output of TF/F9 ₁₄ becomes "1".

As a result, AND gate 9 ₁₆ and TF/F9 ₁₄
The output of AND gate ₉₂₁ to which Q of TF/ _F919 is connected becomes "1". The Q output of latch 9 ₁₈ is
Since it is connected to the reset terminal R of TF/F9 ₁₉ , the Q of TF/F9 ₁₉ becomes "0".

As a result, the output of the OR gate ₉₂₈ becomes "0" and the fast forward signal b from the control circuit is output by the AND gate ₉₆ .
is blocked.

At the same time, the control circuit also stops rapid forwarding of the step motor.

As a result, the hour hand can display the month, and the minute hand can display the day.

In this way, in the month/day display mode, the hands do not move while displaying the month/day, and the hour/minute information is counted by the first counting circuit.

Next, the operation of returning from month/day mode to hour/minute display mode will be explained.

When the mode is changed to the hour and minute display mode by operating the switch in the month and day display mode, the signal d from the mode register changes from "0" to "1" at the rise of the signal e from the input circuit. Therefore
A pulse is generated at the output of AND gate ₉₂₆ .
At the rising edge of this pulse, the Q output of TF/F9 ₂₄ becomes "1".

When the Q output of TF/F9 ₂₄ becomes "1", the output of OR gate 9 ₂₈ becomes "1", and the 1 minute counter 9 ₁
The AND gate ₉₆ which cuts off the clock is opened and the fast forward signal b from the control circuit is input.

At this time, the carry of the 1 minute counter 9 ₁ is input to the 10 minute counter 9 ₂ and the carry of the 10 minute counter 9 ₂ is input to the hour counter 9 ₃ in order. 1 minute counter 9 ₁ , 10 minute counter 9 ₂ , hour counter 9 ₃
The contents of are compared with the respective contents of the first counting circuit in a coincidence detection 10.

When match detection 10 detects a match, match detection 1
The output of 0 becomes "1". AND gate ₉₂₇ sets latch ₉₂₃ with "1" of coincidence detection 10 and "1" of Q output of TF/F ₉₂₄ . As a result,
The output of TF/ _F924 becomes "0" and the input clock of one minute counter ₉₁ is cut off by AND gate ₉₆ .
Therefore, the hours and minutes of the first counting circuit, the one-minute counter 9 ₁ , the ten-minute counter 9 ₂ , and the second counting circuit constitute the first counting circuit.
The second counting circuit is fast-forwarded until the contents of the hour counter ₉₃ match.

During this time, the control circuit drives the step motor in synchronization with the signal that fast-forwards the second counting circuit. As a result, the hands that used to display the month and day can now display the hour and minute.

Changes from month/day display mode to hour/minute display mode,
When the fast forwarding of the second counting circuit is completed, the writing circuit 8 transfers the contents of the first counting circuit to the one-minute counter 9 constituting the second counting circuit at the cycle of the signal a synchronized with the signal for driving the step motor from the control circuit. ₁ ,
10 minute counter 9 ₂ , hour counter 9 ₃ , day counter 9
₄ and month counter ₉₅ , respectively.

As described above, if the speed reduction ratio of the wheel train and the frequency division ratio of the electronic circuit are configured to be equal, it becomes possible to display the month and day with the hands.

Although the embodiment has been described with respect to a case where the circuit is constructed using state logic, the circuit can be easily realized using dynamic logic, and the present invention is not limited to the embodiment.

〔Effect of the invention〕

As explained above, the present invention includes: a minute counter and an hour counter configured with the same frequency division ratio as the reduction ratio of the wheel train from the step motor to the indicating means; and a day counter that counts the carry of the hour counter. a first counting circuit having a month counter that counts the carries of the day counter; and when the clock mode is set to month/day mode;
A day counter that has a minute counter and an hour counter into which the count result of the first counting circuit is written and has the same frequency division ratio as the first count, and that counts the carries of the minute counter. and a second counting circuit having a month counter that counts the carries of the hour counter; and a step motor drive control circuit that operates the step motor based on the counting result of the information regarding the month and day of the second counting circuit. This has the effect of making it possible to obtain a pointer-type electronic clock that does not require adjustment of the date wheel at the end of the small month.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a more detailed embodiment of the write circuit, second counting circuit, and coincidence detection circuit of FIG. 1. DESCRIPTION OF SYMBOLS 1... Oscillation circuit, 2... Frequency division circuit, 3... Control circuit, 4... Step motor, 5... Wheel train, 6...
...Pointer, 7...First counting circuit, 8...Writing circuit, 9...Second counting circuit, 10...Coincidence detection circuit, 11...Switch, 12...Input circuit, 13
...Mode register.

Claims (1)

[Scope of Claims] 1. A pointer-type electronic timepiece that includes a step motor and a pointer-type electronic timepiece that displays time information, etc. through indicating means such as an hour hand and a minute hand through a wheel train by the step motor, (a) a time mode of the timepiece display; (b) a minute counter and an hour counter configured with the same frequency division ratio as the reduction ratio of the gear train from the step motor to the indicating means; (c) the mode of the watch is set to the month/day mode by the operation of the mode changeover switch; When the counting result of the first counting circuit is written, and the minute counter and the hour counter have the same frequency division ratio as that of the first counting circuit, and the carrier of the minute counter is a second counting circuit having a day counter that counts the number of carries of the hour counter, and a month counter that counts the number of carries of the hour counter; What is claimed is: 1. A pointer-type electronic timepiece, comprising: a step motor drive control circuit that causes