JPH11344582A - Electronic-controlled mechanical clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic-controlled mechanical clock capable of reducing the metering fluctuation. SOLUTION: An electronic-controlled mechanical clock is provided with a generator 2 to convert the mechanical energy to be transmitted through a train wheel from a main spring to the electric energy, and a rotation controlling means 10 to control the period of rotation of the generator 2. The rotation controlling means 10 effects the first brake control to apply a brake to the generator by the pre-set time at a specified timing when the value of an up- down counter 60 in which the rotation detection signal FG1 corresponding to the period of rotation of the generator 2 and the reference signal fs from a time standard source are inputted reaches the first set value, and the period of rotation of the generator 2 is faster than the reference signal period. Thus, the increase of the operational speed of the generator 2 can be suppressed, and the metering fluctuation can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for converting the mechanical energy of a mechanical energy source such as a mainspring into electrical energy by a generator, and operating the rotation control means by the electrical energy to thereby control the rotation cycle of the generator. To accurately control the hands fixed to the wheel train by controlling the electronic timepiece.

[0002]

2. Description of the Related Art By converting mechanical energy when a mainspring is opened into electric energy by a generator and operating a rotation control means by the electric energy to control a current value flowing through a coil of the generator, 2. Description of the Related Art There is known an electronically controlled mechanical timepiece that accurately drives a hand fixed to a wheel train and accurately displays time.

[0003] As a speed control method in an electronically controlled mechanical timepiece, the present applicant uses an up-down counter to convert a reference signal from a time standard source composed of a quartz oscillator and a rotation detection signal detected as the generator rotates. , And when the value of the up / down counter reaches the set value, a speed control method for performing brake control of the generator has been devised.

In this speed control method, as shown in the conventional example in the conceptual diagram of FIG. 4, when the rotation cycle of the generator is slower than the reference signal cycle, the brake control is not performed. Since the mechanical energy of the mainspring is set so that the rotation cycle of the generator is faster than the reference signal cycle when the brake is not applied, the rotation cycle returns to the reference signal cycle unless the brake is applied.

If the brake control is not performed as it is, the rotation cycle of the generator becomes faster than the reference signal cycle,
For example, if the rotation detection signal is an up-count input and the reference signal is a down-count input, the input of the rotation detection signal increases more than the input of the reference signal, and the value of the up-down counter gradually increases. When this value exceeds a set value, the generator is braked and controlled.

As shown in FIG. 4, the set value for applying the brake is equal to the delay when the rotation cycle of the generator is slower than the reference signal cycle (a straight line representing the reference signal cycle,
Area S1) surrounded by the curve of the later part,
The advance amount (the area S2 surrounded by the straight line representing the reference signal period and the curve earlier than the reference signal period) when the state is earlier than the reference signal period is canceled out to become the reference signal period. Must be set. For this reason, conventionally, the brake was applied after the rotation cycle became somewhat earlier than the reference signal cycle, and control was performed so that the time until the return to the reference signal cycle was slow and early was almost the same. .

[0007]

However, in such a control, the speed can be adjusted to the reference signal cycle in a relatively short time, but on the other hand, the speed difference between the slowest and the fastest rotation cycle is obtained. There has been a problem that f1, that is, the fluctuation amount of the hand movement becomes relatively large.

An object of the present invention is to provide an electronically controlled mechanical timepiece that can reduce the amount of wobbling of the hands.

[0009]

An electronically controlled mechanical timepiece according to the present invention is provided with a mechanical energy source, a wheel train driven by the mechanical energy source, and transmitted via the wheel train. A generator for supplying electrical energy generated by the mechanical energy source, a pointer coupled to the wheel train, and rotation control means driven by the electrical energy to control a rotation cycle of the generator. In the electronically controlled mechanical timepiece provided, the rotation control means detects a rotation cycle of the generator and outputs a rotation detection signal corresponding to the rotation cycle, based on a signal from a time standard source. A reference signal generating means for generating a reference signal; an up-counter receiving one of the rotation detection signal and the reference signal as an up-count signal and the other as a down-count signal; And down counter, a cycle comparing means for rotating cycle rotation period is compared with a reference signal period of the generator is detected that is earlier than the reference signal period,
When the value of the up / down counter reaches the first set value and the cycle comparing means detects that the rotation cycle is earlier than the reference signal cycle, the generator is provided for a preset time at a predetermined timing. The first to brake
And braking control means for performing brake control.

In the electronically controlled mechanical timepiece of the present invention, the pointer and the generator are driven by a mechanical energy source such as a mainspring, and the generator is braked by the braking control means of the rotation control means to thereby control the rotation of the rotor, that is, the pointer. Adjust the speed.

Here, the rotation control means of the generator sets the value of the up / down counter for counting the reference signal from the reference signal generation means and the rotation detection signal from the rotation detection means to a predetermined first set value. If the cycle comparing means detects that the rotation cycle is earlier than the reference signal cycle, a first brake control for applying a brake to the generator for a preset time at a predetermined timing is performed.

When the control is performed only by the value of the up / down counter, the delay due to the state where the rotation cycle is slow as shown in the conceptual diagram of the conventional example in FIG. Therefore, the brake cannot be applied until the correction is completed, and the rotation cycle increases.

According to the present invention, not only the value of the up / down counter but also the rotation period and the reference signal period are compared. Therefore, the brake is applied immediately after the rotation period becomes earlier (shorter) than the reference signal period. Can be. As the brake control at this time, the generator is braked only for a predetermined time at a predetermined timing, that is, intermittently, so that the braking force can be reduced as compared with the case where the brake is continuously applied. Therefore, as shown in the conceptual diagram of the present invention in FIG. 4, when the rotation cycle becomes earlier than the reference signal cycle, a relatively weak brake can be applied earlier, so that an increase in the speed of the generator is suppressed. be able to. Therefore, it is possible to reduce the difference f2 between the minimum value and the maximum value of the speed of the rotation cycle, that is, the fluctuation amount of the hand movement. In addition,
Also in this case, the areas S1 and S2 are almost the same.

At this time, the cycle comparing means outputs a reset signal in accordance with the rotation detection signal, counts a signal of a fixed cycle, and resets the count value when the reset signal is input. A counter that outputs a signal when a signal for a reference signal cycle is counted before the reset signal is input,
A brake set circuit that outputs a brake set signal in response to a signal from the counter.

As the cycle comparing means, means for detecting a rotation cycle, storing the data in a memory or the like, and comparing the data with reference signal cycle data can be employed. However, if a counter and a reset circuit are used, the configuration is simplified. And cost can be reduced.

[0016] The braking control means may be configured to operate when the value of the up / down counter reaches a second set value which is reached when the rotation cycle of the generator is earlier than the state of the first set value. It is preferable that the second brake control having a larger braking force than the first brake control is performed. As the second brake control, for example,
While the value of the up / down counter is equal to or more than the second set value, control or the like for continuously applying a brake to the generator may be performed.

Depending on the balance between the torque of the mainspring and the braking force of the first brake control, the rotation cycle may be gradually advanced even if the first brake control is performed. In such a case, if the second brake control with a larger braking force is performed, an increase in the rotation cycle can be reliably suppressed, and the wobbling amount of the hand movement can be further reduced.

Further, it is preferable that the timing of applying the brake during the first brake control is set in accordance with the timing at which the rotation detection signal is input to the up / down counter.

If the brake timing is set in accordance with the input timing of the rotation detection signal, the number of brakes per predetermined time may be increased if the rotation cycle is short and the input interval of the rotation detection signal is short. If the rotation cycle is slow and the input interval of the rotation detection signal is long, the number of brakes is reduced, so that appropriate brake control according to the rotation cycle can be performed.

Further, the rotation control means includes a switch capable of short-circuiting both ends of the generator, and the braking control means applies a brake signal consisting of a rectangular wave pulse to the switch to turn on and off the switch. Thus, it is preferable that the generator is configured to be brake-controllable, since the configuration can be simplified and the cost can be reduced.

[0021]

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

FIG. 1 is a block diagram showing an electronically controlled mechanical timepiece according to an embodiment of the present invention, and FIG. 2 is a circuit diagram thereof.

The electronically controlled mechanical timepiece includes a mainspring 1 as a mechanical energy source and a torque of the mainspring 1 generated by a generator 2.
And a pointer 4 connected to the speed increasing wheel train 3 for displaying time.

The generator 2 is driven by the mainspring 1 through the speed increasing wheel train 3 to generate induced power and supply electric energy. The AC output from the generator 2 is rectified through a rectification circuit 5 including step-up rectification, full-wave rectification, half-wave rectification, transistor rectification, etc., and is stepped up as necessary to charge a power supply circuit 6 composed of a capacitor and the like. Supplied.

The generator 2 includes a transistor 7A and a diode 7B as switching elements shown in FIG.
The brake circuit 7 is connected, and the brake circuit 7 is controlled to short-circuit both ends of the generator 2 to apply a short brake so that the speed of the generator 2 can be adjusted. It is desirable that the brake circuit 7 has a circuit configuration using a diode having a small forward voltage as the diode 7B.

The brake circuit 7 is controlled by a rotation control means 10 driven by electric power supplied from a power supply circuit (capacitor) 6. This rotation control means 1
1 includes an oscillation circuit 11, a rotation detecting means 20, and a control circuit 30, as shown in FIG.

The oscillation circuit 11 outputs an oscillation signal (32768 Hz) using a quartz oscillator 11A which is a time standard source, and this oscillation signal is fixed to a certain frequency by a frequency dividing circuit 12 comprising 12 flip-flops shown in FIG. Frequency division is performed up to the cycle. The output Q12 of the twelfth stage of the frequency divider 12 is 8H
It is output as the reference signal fs of z. Therefore, the oscillation circuit 11, the crystal oscillator 11A, and the frequency dividing circuit 12 constitute a reference signal generating means 15.

The rotation detecting means 20 includes a waveform shaping circuit 21 connected to the generator 2. The waveform shaping circuit 21 includes an amplifier, a comparator, a filter, and the like, and outputs a rotation detection signal FG1 from which a sine wave is converted into a rectangular wave to remove noise.

The control circuit 30 includes a braking control means 40, a cycle comparison means 50, an up / down counter 60, a synchronous circuit 7
0 is provided.

The up-count input and the down-count input of the up-down counter 60 are connected to the rotation detecting means 2.
The rotation detection signal FG1 of 0 and the reference signal fs from the reference signal generating means 15 are input via the synchronization circuit 70, respectively.

The synchronization circuit 70 comprises four flip-flops 71 and an AND gate 72. The fifth stage output Q5 (1024 Hz) and the sixth stage output Q6 (5
Using the signal of 12 Hz), the rotation detection signal FG1 is synchronized with the reference signal fs (8 Hz), and adjustment is made so that these respective signal pulses are not output overlapping.

The up / down counter 60 is constituted by a 4-bit counter. Up / down counter 60
A signal based on the rotation detection signal FG1 is input from the synchronization circuit 70 to an up-count input, and a signal based on the reference signal fs is input from the synchronization circuit 70 to a down-count input. Thus, the counting of the reference signal fs and the rotation detection signal FG1 and the calculation of the difference can be performed simultaneously.

The up / down counter 60 is provided with four data input terminals (preset terminals) A to D. When an H level signal is input to the terminals A, B and D, the up / down counter 60 increases the data. The initial value (preset value) of the down counter 60 is set to the counter value “11”.

The LOA of the up / down counter 60
The D input terminal is connected to an initialization circuit 8 that is connected to the power supply circuit 6 and outputs a system reset signal SR according to the voltage of the power supply circuit 6.

Since the up / down counter 60 does not receive an up / down input until the system reset signal SR is output, the counter value of the up / down counter 60 is maintained at "11".

The up / down counter 60 has 4-bit outputs QA to QD, and these outputs QA to QD
Are input to the line decoder 65.

In the line decoder 65, outputs Y0 to Y15 corresponding to the counter values "0" to "15" of the up / down counter 60 are provided. The outputs of Y0 and Y15 of the line decoder 65 are connected to the synchronization circuit 7
The output from 0 is input to the NAND gate 61 to which it is input. Therefore, for example, when a plurality of inputs of the up-count signal continue, the counter value becomes “15”, and Y
When the L-level signal is output from 15, even if the up-count signal is further input to the NAND gate 61, the input is canceled and the up-down counter 60 is set so that the up-count signal is not input any more. I have. As a result, the counter value becomes “15”.
Is set so as not to exceed "0" and to become "0" or to exceed "0" and become "15".

Outputs Y12 to Y15 of line decoder 65
Is connected to a NAND gate 80 as a second brake signal generating means. In the line decoder 65, one selected output goes to L level and the other 15 outputs go to H level, so that outputs Y12 to Y15 are NANDed.
By connecting to the gate 80, when any of these outputs is selected, that is, when the up-down counter 6
When the counter value of 0 is "12" to "15", an H level signal is output as the brake signal BKS2, and when the counter value is "11" or less, an L level signal is output.

The brake signal BKS2 is input to the NOR gate 41, and the brake signal BKS1 output from the NOR gate 41 is input to the gate of the Pch transistor 7A. Therefore, when the counter value of the up / down counter 60 becomes "12" to "15", the brake signal BKS2 becomes an H level signal and the brake signal BKS1 from the NOR gate 41 becomes an L level signal, so that the transistor 7A is turned on. And the generator 2 is short-circuited and the brake is applied.

The CK input of the flip-flop 43 is connected to the output Y 9 of the line decoder 65 via the inverter gate 42. The CLR input of the flip-flop 43 is connected to the output Y12 via the inverter gate 42.

Since an H level signal is always input to the D input of the flip-flop 43, when the count value of the up / down counter 60 becomes "9" and an L level signal is input from Y9, the flip-flop 43 is input. An H level signal is output from the Q output 43. Then, the Q output of the flip-flop 43 is maintained at the H level until the counter value becomes “12” and the L level signal is input from Y12, and when the counter value becomes “12”, the Q output is reset. This is an L level signal.

The Q output of the flip-flop 43 is A
The signal is input to the ND gate 44. On the other hand, the cycle comparing means 50 includes a decimal counter 51, a reset circuit 52,
And a brake set circuit 53.

The decimal counter 51 receives the output Q8 (64 Hz) of the frequency dividing circuit 12 and counts its pulse signal.

The reset circuit 52 includes a flip-flop 5
4 and an AND gate 55, and a rotation detection signal FG
A reset signal is output to the decimal counter 51 and the brake set circuit 53 when 1 is input.

The brake set circuit 53 is composed of two flip-flops 56 and 57, and outputs a brake set signal (H level signal) to the AND gate 44 when the output Q6 of the decimal counter 51 is input. ing.

That is, the decimal counter 51 operates 64H after the reset signal from the reset circuit 52 is input.
In order to start counting the pulse of z, if there is no next reset signal (input of the rotation detection signal FG1) before counting the seventh pulse (the period of the reference signal of 8 Hz), a signal is output from the output Q6. I do.

Therefore, when the input cycle of the rotation detection signal FG1 is later (longer) than the reference signal cycle (8 Hz), an H level signal is output from the output Q of the flip-flop 56. On the other hand, when the input cycle of the rotation detection signal FG1 is earlier (shorter) than the reference signal cycle (8 Hz),
Since the reset signal is input before the output Q6 is output, the output Q of the flip-flop 56 is maintained at the L level signal.

The output from the flip-flop 57 changes in accordance with the up-count signal FG2 from the synchronization circuit 70 and is output with the D input inverted, so that the output Q of the flip-flop 56 becomes the H level signal. Sometimes L
The level signal is output to the AND gate 44, and the H level signal is output to the AND gate 44 when the signal is an L level signal.
Accordingly, from the brake set circuit 53 of the cycle comparing means 50, an H level signal is input to the AND gate 44 if the rotation cycle of the generator 2 is earlier than the reference signal cycle, and an L level signal is inputted to the AND gate 44 if the rotation cycle is later. Is input to

The decimal counter 51 includes the braking control means 4
The flip-flop 46 as the first brake signal generating means 45 of 0 and the AND gate 47 are connected.
The first brake signal generating means 45 outputs the rotation detection signal FG1
The output Q2 of the decimal counter 51 is input, and a rectangular pulse signal having a predetermined width is output to the AND gate 44.

Accordingly, as shown in FIG. 3, the output ANS of the AND gate 44 is the same as the output of the line decoder 65.
9 to Y11, the output from the flip-flop 43 becomes an H level signal, and the cycle of the rotation detection signal FG1 is earlier than the reference signal cycle, so that the output from the brake set circuit 53 of the cycle comparing means 50 (the flip-flop) The output from the first brake signal generating means 45 is output when the output signal from the control unit 57 becomes an H level signal.

At this time, since the signal BKS2 from the NAND gate 80, which is the second brake signal generating means, remains at the L level signal, the signal ANS is inverted and output as the brake signal BKS1, and the generator 7 First brake control is performed to apply a short brake to the second brake at a predetermined interval.

On the other hand, when the value of the line decoder 65 becomes equal to or more than Y12, an L level signal is output from the flip-flop 43, so that the signal ANS is maintained at L level.
The signal BKS2 is inverted as it is and the brake signal BKS
1 and is controlled by the brake circuit 7 to apply a brake to the generator 2. Since the brake is continued until the output of the line decoder 65 becomes equal to or less than Y11, the second brake control is performed by continuously inputting the brake having a stronger braking force to the line decoder 65 than the brake between Y9 and Y11.

Therefore, in this embodiment, the NOR gate 4
1, inverter gate 42, flip-flop 43,
The braking control means 40 is constituted by the AND gate 44, the flip-flop 46 of the first brake signal generation means 45, the AND gate 47, the line decoder 65, and the NAND gate 80 as the second brake signal generation means.

According to this embodiment, the following effects can be obtained.

The rotation control means 10 outputs the rotation detection signal FG
1 and the value of the up / down counter 60 to which the reference signal fs is inputted, and the rotation detection signal FG1 and the reference signal fs.
Since the first brake control is performed using the output of the cycle comparing means 50 for comparing the cycles of the above, the brake control can be performed immediately after the rotation cycle of the generator 2 becomes earlier than the reference signal cycle. In addition, in the first brake control, the generator is braked only for a predetermined time at a predetermined timing, that is, intermittently, so that the braking force can be reduced as compared with a case where the brake is continuously applied.

For this reason, as shown in the present invention in FIG. 4, when the rotation period becomes earlier than the reference signal period, a relatively weak brake can be applied earlier, so that the maximum speed of the rotation period is suppressed. Thus, the difference f2 between the minimum value and the maximum value of the speed of the rotation cycle, that is, the wobbling amount of the hand movement can be reduced. For this reason, it is possible to provide a high-quality timepiece with less fluctuation of the hands.

Further, when the rotation cycle of the generator 2 is accelerated and the counter value of the up / down counter 60 becomes “12” or more even when the first brake control is performed, the rotation control means 10 controls the first brake. Since the second brake control having a larger braking force can be performed as compared with the control, the braking control can be reliably performed to suppress an increase in the rotation of the generator 2, and the wobbling amount of the hand movement can be further reduced. .

The period comparison means 50 is a decimal counter 5
1, a reset circuit 52, and a brake set circuit 53. Since a memory for storing the rotation cycle of the generator 2 and the reference signal cycle can be eliminated, the configuration can be simplified and the cost can be reduced.

The up-count signal FG2 is input to the clock input of the flip-flop 57 of the brake set circuit 53, and the timing for applying the brake during the first brake control is set in accordance with the timing at which the rotation detection signal is input to the up-down counter. Therefore, if the rotation period is shortened and the input interval of the rotation detection signal is shortened, the number of brakes per predetermined time can be increased, and the rotation period is delayed and the rotation detection signal is input. When the interval is long, the number of brakes can be reduced. Therefore, appropriate brake control according to the rotation cycle can be performed.

The rotation control means 10 includes a brake circuit 7 having a transistor 7A capable of short-circuiting both ends of the generator 2. The braking control means 40 includes the transistor 7A.
Since the generator 2 is brake-controlled by turning on and off the transistor 7A by applying a brake signal composed of a rectangular wave pulse to the above, the configuration of the brake circuit 7 can be simplified and the cost can be reduced.

Since the 4-bit up / down counter 60 is used, 16 count values can be counted. Therefore, when the up-count signal is continuously input, the input value can be accumulated and counted, and the set value for performing the first brake control and the set value for performing the second brake control are set to a certain width. Can be set in the range with. Therefore, even when the up-count signal and the down-count signal are continuously input, the first brake control and the second brake control can be performed to some extent continuously, and the speed control is reliably and stably performed. Can be.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention.

For example, in the above embodiment, the 4-bit up / down counter 60 is used, but an up / down counter of 3 bits or less may be used, or an up / down counter of 5 bits or more may be used. If an up / down counter having a large number of bits is used, the countable value increases, so that the range in which the accumulated error can be stored can be increased, and control particularly immediately after the start of the generator 2 becomes advantageous. On the other hand, if a counter having a small number of bits is used, the range in which the accumulated error can be stored becomes small, but there is an advantage that the cost can be reduced.

The brake circuit 7 and the braking control means 4
The specific configurations of 0, the period comparison means 50, the synchronization circuit 70, and the like are not limited to those of the above-described embodiment, and may be appropriately set in implementation. In particular, the braking control means 40 is not limited to the one using the line decoder 65 or the like, and may be configured to grasp and control the counter value by directly using the outputs QA to QD of the up / down counter 60, for example.

Further, the generator 2 is controlled only by the first brake control.
When the mainspring torque or the like is set so as to suppress the rotation cycle of, the configuration for the second brake control, that is, the NAND gate 80 and the like need not be provided.

[0066]

As described above, according to the electronically controlled mechanical timepiece of the present invention, there is an effect that the wobbling amount of the hands can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an electronically controlled mechanical timepiece according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of an electronically controlled mechanical timepiece of the embodiment.

FIG. 3 is a timing chart showing brake control according to the embodiment.

FIG. 4 is a conceptual diagram showing a brake control method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 spring 2 generator 3 gear train 4 pointer 5 rectifier circuit 6 power supply circuit 7 brake circuit 7A transistor 8 initialization circuit 10 rotation control means 11 oscillation circuit 11A crystal oscillator 15 reference signal generation means 20 rotation detection means 21 waveform shaping Circuit 30 Control circuit 40 Brake control means 45 First brake signal generation means 50 Period comparison means 51 Decimal counter 52 Reset circuit 53 Brake set circuit 60 Up / down counter 65 Line decoder 70 Synchronization circuit 80 NAND as second brake signal generation means Gate

Claims (5)

[Claims] 1. A mechanical energy source, a wheel train driven by the mechanical energy source, and a generator supplying electrical energy generated by the mechanical energy source transmitted through the wheel train. An electronically controlled mechanical timepiece comprising: a hand coupled to the wheel train; and rotation control means driven by the electric energy to control a rotation cycle of the generator. The rotation control means comprises: Rotation detection means for detecting a rotation cycle of the rotation detection signal and outputting a rotation detection signal corresponding to the rotation cycle; reference signal generation means for generating a reference signal based on a signal from a time standard source; An up-down counter in which one of the signals is input as an up-count signal and the other is input as a down-count signal; Cycle comparison means for detecting that the rotation cycle is earlier than the reference signal cycle, and the value of the up / down counter becomes a first set value and the cycle comparison means sets the rotation cycle to the reference signal cycle. When it is detected that the speed is earlier than the first time, the generator is braked for a preset time at a predetermined timing.
An electronically controlled mechanical timepiece, comprising: braking control means for performing brake control. 2. The electronically controlled mechanical timepiece according to claim 1, wherein the period comparison means outputs a reset signal in accordance with the rotation detection signal, and counts a signal of a fixed period and performs the reset. A counter that resets the count value when a signal is input, and outputs a signal when a signal for a reference signal cycle is counted before the reset signal is input. In response to a signal from the counter, An electronically controlled mechanical timepiece, comprising: a brake set circuit that outputs a brake set signal. 3. The electronically controlled mechanical timepiece according to claim 1, wherein the braking control means sets the value of the up / down counter to be smaller than the first set value. An electronically controlled mechanical timepiece that performs a second brake control with a larger braking force than at the time of the first brake control, when a second set value that is reached when the vehicle speed is earlier is reached. 4. The electronically controlled mechanical timepiece according to claim 1, wherein a timing of applying a brake during the first brake control is set in accordance with a timing at which a rotation detection signal is input to an up / down counter. An electronically controlled mechanical timepiece characterized by being made. 5. The electronically controlled mechanical timepiece according to claim 1, wherein the rotation control means includes a switch capable of short-circuiting both ends of the generator, and the braking control means includes a switch. An electronically controlled mechanical timepiece characterized in that the generator is brake-controllable by applying a brake signal consisting of a rectangular wave pulse to turn on and off a switch.