JPH0154674B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic metronome, and more particularly to a step motor-driven metronome, and a novel improvement for obtaining an energy-saving electronic metronome by keeping the step motor's torque-frequency characteristics constant. It is.

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.

Later, in order to produce this tact effect, an electric meter was developed that uses sound, light, and a meter to create a tact rod effect, but the electric meter's tracking ability was poor, and when the tempo or beat was fast, However, its poor followability became apparent, and it was not possible 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 1, the torque-frequency characteristics of the step motor's driving force vary greatly depending on the voltage parameter, so if the step motor is always driven with 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.

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. This configuration is such that a pulse signal from a pulse generation 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.

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 generally trapezoidal shape as a whole, and a reduction mechanism 2 having a box-like shape as a whole is provided at the bottom of the frame 1 and is fixed with bolts 3. At the same time, a step motor 4 is attached to the outer side of the speed reduction 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 provided 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 and 5, in the speed reduction mechanism section 2, a pinion 13 is integrally fitted to a rotating shaft 12 of a step motor 4 mounted on a casing body 11. At an upper position, a sector gear 14 is rotatably attached to the casing body 11.
It is set in.

One end 14a of the sector gear 14 protrudes outside the casing body 11, and the one end 14a
A tact rod 15 is integrally and fixedly attached to the.

A relay gear 16 is rotatably provided at the lower part of the casing body 11, a large diameter gear 16a of this relay gear 16 meshes with the pinion 13, and a small diameter gear 16b of the relay gear 16 meshes with the fan gear. 14, the pinion 13 and the sector gear 14 are coupled to each other by the relay gear 16 so as to be able to interlock with each other.

Here, the above-mentioned step motor 4 and pinion 1
3. The relay gear 16 and the sector gear 14 are configured in the following relationship, and the reciprocating rotation angle of the tact rod 15 is assumed to be 72 degrees.

In other words, tact rod rotation angle = step motor rotation speed x number of pinion teeth x number of relay gear teeth (small diameter) / number of relay gear teeth (large diameter) x number of fan gear teeth x 360° = 6.4 x 15 x 20 / 80 x 120 =72°.

To describe the above-mentioned condition more specifically, since the step motor 4 is configured to rotate 18 degrees with one pulse, 20 pulses are required for one rotation. If 128 pulses are input, if the tact rod 15 is designed to reverse, the result will be 28/20, and the step motor 4 will need to rotate 6.4 times.

When 128 pulses are input to this step motor 4,
The pinion 13 rotates 6.4 times, the teeth of the pinion 13 move 15×6.4=96 steps, the large diameter gear 16a of the relay gear 16 makes 96/80=1.2 turns, and the small diameter gear 16b moves 20×1.2= It will move 24 steps. As the small diameter gear 16b moves 24 steps, the fan gear rotates 24/120 times, and the tact rod 15 rotates 360 degrees x 24/120=72 degrees.

Furthermore, 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 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.

Specifically disclosing the power control section 48 and the stepping motor drive signal generation section 47, the seventh
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 a pulse generation circuit 52 via an arithmetic circuit 51. This pulse generation circuit 52 is configured to be able to change the pulse width with a duty ratio of 1/16 to 16/16, and can generate arbitrary pulse widths based on the data calculated by the calculation circuit 51 using the input tempo signal and voltage signal. One comb-shaped pulse having the specified duty ratio is output from the pulse generating 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. 8) is input to the AND circuit group 53, each AND
From the circuit 53, comb-shaped four-phase driving pulses (shown in FIG. 8) according to the output from the pulse generation circuit 52 are applied to the step motor section 50 via the forward/reverse control circuit 54, and the step motor section 4 is Rotated in reverse.

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 the comb signal controlled by the pulse generation circuit 52 of the power control section 48, and the step motor section 4 is driven by the tact rod 15 every 128 pulses.
Perform continuous reciprocating motion within a range of 72°,
When the tact rod 15 is reversed, sound is generated from the speaker section 5.

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-shaped pulses (in this example
128 pulses) and is reversed every 128 pulses, which extends battery life, reduces noise and noise as no extra load is applied to the tact rod, and extends the life of the motor. It has excellent effects such as

[Brief explanation of drawings]

Fig. 1 is a torque versus frequency characteristic diagram of a general step motor, Fig. 2 is a front view showing an electronic metronome according to the present invention, Fig. 3 is a side sectional view of Fig. 2, and Fig. 4 is a sectional view showing the main parts. Figure 5 is a front configuration diagram of Figure 4, Figure 6 is a block circuit diagram showing the overall configuration, Figure 7 is a circuit diagram showing the configuration for power control of the main parts, and Figure 8 is a step motor drive. FIG. 3 is a waveform diagram showing waveforms. 1 is a frame body, 2 is a speed reduction mechanism, 3 is a bolt, 4 is a step motor, 5 is a speaker, 6 is a power source, 7 is a sliding control body, 8 is an operator, 9 is a guide hole, 10
is a button, 11 is a casing body, 13 is a pinion, 14 is a sector gear, 15 is a tact rod, 16 is a relay gear, 40 is a reference oscillator, 41 is a tempo synthesis section, 42 is a beat signal generation section, 43 is a strong beat/weak beat 45 is a tempo setting section, 46 is a beat setting section, 47 is a stepping motor drive signal generation section, 48 is a power control section, 49 is a power supply voltage detection circuit section, 51 is an arithmetic circuit, 52 is a pulse generation circuit,
53 is an AND circuit, and 54 is a forward/reverse control circuit.

Claims (1)

[Claims] 1. A tempo synthesis section for inputting the output signal from the reference oscillator, a beat signal generation section for inputting the output signal from the tempo synthesis section, and an output from the beat signal generation section. a speaker section for producing sound through a strong beat and weak consonant synthesis section; a stepping motor drive signal generation section for inputting the output from the tempo synthesis section; and a stepping motor drive signal generation section connected to the stepping motor drive signal generation section. 1. An electronic metronome comprising: a step motor section; and a deceleration mechanism section having a tact rod driven reciprocally by the step motor section, the tact rod being electrically reciprocated by the step motor section. 2. A power control section provided between the stepping motor drive signal generation section and the step motor section, and a pulse generation circuit for changing the signal duty ratio from the tempo synthesis section provided in the power control section. , the pulse signals from the step motor drive signal generation section and the pulse generation circuit are input to the power control section, and the drive signal applied to the step motor is made into a comb-shaped pulse to substantially equalize the drive torque. An electronic metronome according to claim 1, characterized in that: