JPS6011192A - Electronic metronome - Google Patents

Abstract

PURPOSE:To reduce noise to extend the life of a motor by inputting pulse signals from a step motor driving signal generating part and a pulse generating circuit to a power control part to otain tooth pulses and making a driving torque approximately uniform. CONSTITUTION:One end 14a of a fan-shaped gear 14 is projected to the outside of a casing body 11, and a tact bar 15 is fixed there. An interrupting gear 16 is provided in the lower part of the casing body 11, and a large-diameter 16a bites a pinion 13, and a small-diameter gear 16b bites the fan-shaped gear 14, and the pinion 134 and the fan-shaped gear 14 are connected by the interrupting gear 16. When a button 10 is slided to adjust a scale to optional tempo and measure and a power source is turned on, a step motor part 4 is driven by the comb tooth signal controlled by a pulse generating circuit 52 of a power control part 48, and the step motor part 4 moves the tact bar 15 back and forth continuously within the range of 72 deg. for every 128 pulses.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic metronome, and more particularly to a novel improvement for obtaining a step motor-driven metronome and for obtaining an energy-saving electronic metronome by keeping the torque-frequency characteristics of the step motor 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 used a mainspring as its driving force, it was inconvenient as the metronome had to be wound frequently.

Furthermore, the electronic metronome that has been used recently displays tempo, time signature, etc. with sound and light, and it is impossible to surpass the display effect of the conventional tact stick.

Later, in order to achieve this tact effect, an electric meter was developed that aimed at the tact rod effect using sound, light, and a meter, but the electric meter had poor followability.
When the tempo or beat becomes faster, poor followability becomes apparent, and satisfactory characteristics cannot be obtained. Furthermore, in electric meters, it is difficult to use a large meter needle due to the driving force, and only a small meter needle can be used, and it is impossible to outperform the effect of a conventional tact rod. It was possible.

Furthermore, as a characteristic of the step motor's power, the first
As shown in the figure, the torque-frequency characteristics vary greatly depending on the voltage parameter, so if you always drive with the same pulse, the battery life will be shortened, and extra load will be placed on the tact rod, causing noise. In addition, the life of the motor could be shortened.

The purpose of the present invention is to provide an extremely effective means for quickly eliminating all of the above drawbacks.
In particular, while the tact rod is moved back and forth by a step motor, pulse signals from the step motor drive signal generator and the pulse generator are input to the power control section 1 to generate a drive signal to be applied to the step motor. This is a configuration in which the drive torque is made almost uniform as tooth-shaped pulses.

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 frame indicated by the symbol 1 is a frame whose entire shape is approximately trapezoidal, and at the bottom of this frame 1 there is a reduction mechanism 2 whose entire box shape is attached to the port 3. The step motor 4 is mounted on the outside of the deceleration mechanism 2. A speaker 5 is provided at a position 61 of the step motor 4, and a power source 6 consisting of a battery is provided at the bottom of the frame.

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

As shown in FIGS. 4 and 85, the speed reduction mechanism section 2 has
A binion 13 is integrally fitted to the rotating shaft 12 of the step motor 4 attached to the casing body 11, and a sector gear 14 is rotatably attached to the casing body 11 at an upper position of the rotating shaft 12. It is provided.

One end 14α of the sector gear 14 is connected to the casing body 11
A tact rod 15 is integrally fixed and attached to one end 14Q of this protruding outside.

A relay gear 16 is rotatably provided at the lower part of the casing body 11, and the large diameter gear 16α of the relay gear 16 meshes with the binion 13, and the small diameter gear 1
6b is meshed with the fan gear 14, so that the binion 13 and the fan gear 14 are operatively connected to each other by the relay gear 16.

Here, the above-mentioned step motor 4, binio/13, relay gear 16. % and the sector gear 14 are constructed in the following relationship, so that the reciprocating rotation angle of the tact rod 15 is 72 degrees.

That is, sudden fall, 36 o. To describe the above situation more specifically, the step motor 4
Since it is configured to rotate 18 degrees with one pulse, 20 pulses are required for one rotation. When 128 pulses are input, the tact rod 15 will be reversed. You need to do 4 rotations.

When 128 pulses are input to this step motor 4, the binion 13 rotates 6.4 times, and the teeth of the binion 13 are 15×6.
．． 4 = 96 steps, medium and small diameter gear 16
b will move by 20×1°2=24 steps. In addition to the fact that the small diameter gear 16b moves b1 steps, the electrical circuit configuration constituting the electronic meme of the present invention is as follows.
As shown in FIG. A tempo setting section 45 is connected to the tempo setting section 45, and a time signature setting section 46 is connected to the beat signal generating section 42.

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.
The output signal is applied to the power control section 48. The power control section 48 receives the detection signal from the power supply voltage detection circuit section 49, and the output signal from the power control section 48 is supplied to the stepping motor section 4.

Specifically, the power control section 48 and the stepping motor drive signal generation section 47 are structured as shown in FIG. The signal from 49 is sent to the pulse generating circuit 52 via an arithmetic circuit 51, and is calculated by the arithmetic circuit 51 using the input tempo signal and voltage signal.
Based on the data, one comb-shaped pulse with an arbitrary duty ratio is output from the pulse generating circuit 52.

The output from this pulse generation circuit 52 is an AND circuit group 5 connected to a stepping motor and a drive signal generation circuit 47.
3 and a four-phase signal from the stepping motor drive signal generation circuit 47 (shown in FIG. 8) is input from each AND circuit 53 to the pulse generation circuit 52.
The comb-shaped four-phase driving pulses (shown in FIG. 8) according to the output from the step motor section 5 are transmitted through the forward/reverse control circuit 54
0 marked D, the step motor section 4 rotates in 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. , the step motor section 4 was controlled by the pulse generation circuit 52 of the power control section 48 (and was driven by the shadow signal t1).
The step motor section 4 rotates the tact rod 2 every 128 pulses.
Perform continuous reciprocating motion within the range of 1.
When the signal 5 is reversed, the speaker section 5 generates sound.

Since the electronic metronome according to the present invention has the above-described more detailed structure and function, the tact bar can be operated electrically for a long time in exactly the same way as a conventional mechanical metronome, and furthermore, the step motor can be operated electrically for a long time. Since all the pulses are supplied (128 pulses in this example) and reversed every 128 pulses, the battery life is long (no extra load is applied to the tact rod, so there is less noise)9. Further, it has other advantages such as prolonging the life of the motor.

[Brief explanation of the drawing]

Fig. 1 is a torque vs. 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 that performs power control of the main parts, Figure 8 is a step motor , is a waveform diagram showing @ dynamic waveforms. 1 is a frame, 2 is a speed reduction mechanism, 3 is a Fi bolt, 4 is a step motor, 5 is a speaker, 6 is a power supply, 7 is a sliding control body, 8 is an operator, 9 is a guide hole, 10 is a button, 11 is a casing 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 meter weak meter combination bottom section, 45 46 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 A The ND circuit 54 is a forward/reverse control circuit. Applicant Daini Seikosha Co., Ltd. Agent Attorney Mogami Tsutomu 1 [21 Figure 2 Figure 3z 6 Figure 4 Figure 5

Claims (1)

[Scope of Claims] (j) A tempo synthesis section for inputting the output signal from the reference oscillator, a beat (i-R generation section) for inputting the output signal from the tempo synthesis section, and a time signature for inputting the output signal from the tempo synthesis section; a speaker section for generating sound through the output from the signal generation section through the full strong beat and weak beat consonant synthesizing section; a stepping motor drive signal generating section for inputting the output from the tempo synthesizing section; There is also a step motor section connected to the signal generating section, and a speed reducer having a tact rod that is reciprocally driven by the step motor section.
:iE, an electronic metronome configured so that the step motor unit can be used to operate the tact cycle back and forth for one night. (2). A power control section provided between the stepping motor drive signal generation section and the step motor, and a pulse generation circuit provided in the power control section for changing the duty ratio of the signal from the tempo synthesis section. The pulse signals from the step motor drive signal generation section and the pulse generation circuit are inputted to the power control section and the drive signals are applied to the step motor as tooth-shaped pulses to substantially equalize the drive torque. An electronic metronome according to claim 1, characterized in that the electronic metronome is configured so as to.