JPH0222351B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic metronome, and in particular, to obtain a step motor-driven metronome, and to obtain an energy-saving electronic metronome by keeping the step motor's torque-frequency characteristics constant. It relates to new improvements for.

[Conventional technology]

There are various types of metronome that have been used in the past, but the most typical configuration is a mechanical metronome. However, since the mechanical metronome uses a spring as its driving force, the spring must be wound frequently, which is inconvenient.

Furthermore, recently used electronic metronomes display tempo, time signature, etc. with sound and light, and it has been impossible to surpass the display effects of conventional tact sticks.

Subsequently, in order to achieve this tact effect, an electric meter was developed to produce a tact bar effect using sound, light, and a meter.

[Problem that the invention seeks to solve]

An electronic metronome that uses an electric meter to provide a tact effect has poor followability with the electric meter, and when the tempo or beat becomes fast, the poor followability becomes apparent, making it impossible to obtain satisfactory characteristics. Furthermore, in electric meters, it is difficult to use a large meter needle due to the driving force, and only small meter needles can be used, making it impossible to outperform the effect of conventional tact rods. It was hot.

Furthermore, as shown in Figure 3, the torque-frequency characteristics of the step motor's driving force vary greatly depending on the voltage parameter, so if you always drive the same pulse width, the battery life will be shortened. The additional load placed on the tact rod increased noise, and also shortened the life of the motor.

[Means for solving problems]

It is an object of the present invention to provide extremely effective means for quickly eliminating the above-mentioned drawbacks, and in particular, it is an object of the present invention to provide extremely effective means for quickly eliminating the above-mentioned drawbacks. The configuration is such that a pulse signal from a pulse generating circuit is input to a power control section, and a drive signal applied to a step motor is a comb-shaped pulse to substantially equalize the drive torque.

[Effect]

When the electronic metronome configured as described above is started, the tact bar is reciprocated by the step motor, and the tact swing mechanism can effectively swing the tact bar. Furthermore, since the configuration is such that the drive torque is made almost uniform, the battery life can be extended.

〔Example〕

Hereinafter, preferred embodiments of the electronic metronome according to the present invention will be described in detail with reference to the drawings.

In the drawings, the reference numeral 1 indicates a frame having a substantially trapezoidal shape as a whole, and a tact swing mechanism 2 having a box-like shape as a whole is provided at the lower part of the frame 1 and is fixed with bolts 3. At the same time, a step motor 4 is mounted on the outside of the tact swing mechanism section 2. A speaker 5 is provided at the front of the step motor 4, and
A power source 6 consisting of a battery is disposed at the bottom of the frame 1.

A sliding control body 7 is attached to the front plate 1a of the frame 1, and this sliding control body 7
The operator 8 protrudes through the guide hole 9 of the front plate 1a, and a button 10 is fitted into the operator 8.

As shown in FIGS. 4 to 7, the tact swing mechanism 2 includes a pulley a13 on the motor shaft 12 of the step motor 4 mounted on the casing body 11.
A belt 14 is rotatably hung around the circumferential direction of the pulley a13, and a pulley b16 is rotatably supported on the pulley b shaft 17 at the other end of the belt 14. belt 1
4 is rotatably hung. The pulley b shaft 17 is integrally fixed to the casing body 11. There is a tact rod drive shaft 18 on the upper part of the belt 14, and the belt 14 and the tact rod drive shaft 18 are integrally fixed with a tact rod drive shaft fixing fitting 19. The tact rod drive shaft 18 passes through the tact rod oval hole 21, and the head of the tact rod drive shaft 18 protrudes outside the tact rod 15, and the head of the tact rod drive shaft 18 is larger than the tact rod oval hole 21. is made of. Furthermore, when the tact rod drive shaft 18 moves between the arrows B, it moves through the tact rod oval hole 21, and the hole is made sufficiently large. A tact rod shaft 20 is provided at the bottom of the tact rod 15 and is fixed to the casing body 11. The tact rod 15 is rotatably mounted on the tact rod shaft 20. There is a casing body hole 22 in the upper part of the casing body 11, and the tact rod 15 is aligned with the arrow C.
The holes are drilled to restrict movement when moving between them.

When the tact swing mechanism 2 with the above configuration is operated, the step motor 4 is configured to rotate 18 degrees with one pulse, so when 20 pulses are input, the A
It makes one rotation in either direction, and the rotation reaches the tact rod drive shaft 18 via the motor shaft 12, the belt 14, and the tact rod drive shaft fixing fitting 19.
Move anywhere between arrows B. The movement is transmitted to the tact rod 15. Since the lower part of the tact rod 15 is rotatably fixed by the tact rod shaft 20,
By moving the tact rod drive shaft 18 in either the left or right direction, the tact rod 15 is swung in either direction C. The casing body hole 22 coincides with the swing range of the tact rod 15, and the tact rod 15 swings when the step motor 4 loses synchronization or starts.
It is also used as a stopper to limit the swing range of the

Further, in the electrical circuit configuration constituting the electronic metronome of the present invention, as shown in FIG.
1. Connected to the speaker section 5 via a beat signal generation section 42, a strong beat and a weak beat consonant synthesis section 43, and the tempo synthesis section 41 includes a tempo setting section 45 and a beat signal generation section 4.
2 is connected to a time signature setting section 46.

The signal from the tempo synthesis section 41 is applied to the stepping motor drive signal generation section 47 and the power control section 48, and the output signal of the stepping motor drive signal generation section 47 is applied to the power control section 48. There is. A detection signal from a power supply voltage detection circuit section 49 is applied to this power control section 48, and an output signal from this power control section 48 is supplied to the stepping motor section 4.

To specifically disclose the power control unit 48 and the stepping motor drive signal generation unit 47, the ninth
It is configured as shown in the figure, and the tempo synthesis section 4
1 and the signal from the power supply voltage detection circuit section 49 are input to the pulse generation circuit 52 via the arithmetic circuit 51. This pulse generating circuit 52 is 1/
It has a configuration in which the pulse width can be changed with a duty ratio of 16 to 16/16, and the pulse width can be changed at an arbitrary set duty ratio based on the data calculated by the calculation circuit 51 using the input tempo signal and voltage signal. One tooth-shaped pulse is output from the pulse generation circuit 52.

The output from this pulse generation circuit 52 was connected to a stepping motor drive signal generation circuit 47.
When the four-phase signal from the stepping motor drive signal generation circuit 47 (shown in FIG. 10) is input to the AND circuit group 53, each
The AND circuit 53 outputs a comb-shaped four-phase drive pulse (first
0) is applied to the step motor section 4 through the forward/reverse control circuit 54, and the step motor section 4 is rotated in the forward and reverse directions.

In the above configuration, when operating the electronic metronome according to the present invention, first slide the button 10 of the sliding control body 7 to set the scale to a desired tempo and time signature, and then turn on the power. Then, the step motor section 4 is driven by a comb-shaped signal controlled by the pulse generation circuit 52 of the power control section 48, and the step motor section 5 is driven by the tact rod 15 every 20 pulses.
is continuously reciprocated within the range of arrow C, and when the tact rod 15 is reversed, sound is produced from the speaker section 5.

〔Effect of the invention〕

Since the electronic metronome according to the present invention has the above-described structure and function, the tact bar can be electrically operated for long periods of time in exactly the same way as conventional mechanical metronomes, and furthermore, the step motor A large number of comb-tooth pulses (in this example
20 pulses) and is reversed every 20 pulses, which increases battery life and reduces noise and noise as no extra load is applied to the tact bar.
Further, excellent effects such as lengthening the life of the motor can be achieved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an electronic metronome according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a torque vs. frequency characteristic diagram of a general step motor, and Fig. 4 is a main part of tact swing. 5 is a front configuration diagram of FIG. 4, FIGS. 6 and 7 are partial detailed views of FIG. 4, FIG. 8 is a block circuit diagram showing the overall configuration, and FIG. 9 is a main part. FIG. 10 is a circuit diagram showing a configuration for performing power control. FIG. 10 is a waveform diagram showing step motor drive waveforms. 1...Frame body, 2...Tact swing mechanism section, 3...
Bolt, 4...Step motor, 5...Speaker, 6...Power source, 7...Slide control body, 8...
...Controller, 9...Guide hole, 10...Button, 11
...Casing body, 12...Motor shaft, 13...
Pulley a, 14...belt, 15...tact rod,
16...Pulley b, 17...Pulley b axis, 18...
...Tact rod drive shaft, 19...Tact rod drive shaft fixing fitting, 20...Tact rod shaft, 21...Tact rod oval type, 22...Casing body hole, hole, 40...Reference oscillator, 41...Tempo Synthesis unit, 42... Beat signal generation unit, 43... Strong beat, weak beat, 45...
Tempo setting section, synthesis section, 46... time signature setting section, 4
7... Stepping motor drive signal generation section, 4
8...Power control unit, 49...Power supply voltage detection circuit, 51...Arithmetic circuit, circuit, 52...Pulse generation circuit, 53...AND circuit, 54...Forward/reverse control circuit.

Claims (1)

[Claims] 1. A tempo synthesis section that synthesizes a tempo based on the output signal from the reference oscillator and the tempo setting section; a beat signal generation section that generates a beat signal based on the output from the tempo synthesis section and the beat setting section; a strong-metered consonant/weak-metered consonant synthesis section that generates a strong-metered consonant or a weak-metered consonant based on the output from the signal generation section; a speaker section that generates sound based on the output signal from the strong-metered consonant/weak-metered consonant synthesis section; a stepping motor drive signal generation section that generates a step motor drive signal based on the output from the synthesis section; a power supply voltage detection circuit section that monitors the power supply voltage; and a tempo signal from the tempo synthesis section and the power supply voltage detection section. The stepping motor drive is comprised of an arithmetic circuit that outputs a duty ratio set based on a voltage signal from the circuit, a pulse generating circuit that generates pulses based on this duty ratio, and a rotation control section that drives the stepping motor. The step motor is rotated in forward and reverse directions by a power control section that applies a drive signal outputted from a signal generation section to the step motor as a comb tooth pulse, and the forward and reverse rotational motion of the step motor is provided on the rotating shaft of the step motor. This tact is converted into a linear reciprocating motion through a belt supported by a pulley attached to the pulley and another pulley provided opposite to this pulley, and this tact is converted into a linear reciprocating motion by a tact rod drive shaft provided on the belt. An electronic metronome characterized in that a tact rod engaged with a rod drive shaft is reciprocated.