JPH0110632Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronic metronome, and in particular, a novel method for automatically rotating a tact rod back and forth to generate sound by electronically controlling a step motor. It is about improvement.

There are various types of metronome that have been used in the past, but the most typical configuration is a mechanical metronome. However, because the mechanical metronome used a spring as its driving force,
The mainspring had to be wound frequently, which was inconvenient.

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

Later, in order to produce 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 and did not work well with fast tempos or beats. Then, the 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.

The purpose of the present invention is to provide an extremely effective means for quickly eliminating the above-mentioned drawbacks, and in particular, a sector gear rotatably provided in a reduction mechanism provided in a frame. , a tact rod provided at one end of the sector gear, a step motor provided in the deceleration mechanism section, and a relay gear for connecting the step motor and the sector gear; This is a configuration in which the tact rod is rotated back and forth through multiple reverse rotations.

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, what is designated by reference numeral 1 is a frame having a generally trapezoidal shape as a whole, and a reduction mechanism portion 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 battery-based power source 6 is provided at the bottom of the frame 1.

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

As shown in FIG. 3, 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, and a pinion 13 is fitted at an upper position of the rotating shaft 12. is sector gear 1
4 is rotatably provided on the casing body 11.

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 tact rod 15.

A relay gear 16 is rotatably provided at a lower position 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 meshes with the sector gear 14. As a result, the pinion 13 and the sector gear 14 are connected to each other by the relay gear 16 so as to be able to freely interlock with each other.

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

In other words, tact rod rotation angle = Step motor rotation speed × Number of pinion teeth × Number of relay gear teeth (small diameter) / Number of relay gear teeth (large diameter) × Number of sector gear teeth × 360° = 6.4 × 15 × 20 / 80 × 120 =72°.

To describe the state of the above equation more specifically, since the step motor 4 is configured to rotate 18 degrees with one pulse, 20 pulses are required for one rotation. If the tact rod 15 is designed to reverse when 128 pulses are input, the result will be 128/20, and the step motor 4 will
6.4 rotations are required.

When 128 pulses are input to this step motor 4, the pinion 13 rotates 6.4 times, and the teeth of the pinion 13
It will move 15×6,4=96 steps, and the large diameter gear 16a of the relay gear 16 will rotate 96/80=1.2 times.
The small diameter gear 16b will move 20×1.2=24 steps. As the small diameter gear 16b moves 24 steps, the sector gear rotates 24/120, and the tact rod 15 rotates 360° x 24/120 = 72°.

Furthermore, in the electrical circuit configuration constituting the electronic metronome of the present invention, as shown in FIG.
is connected to the amplifier 18 of the control circuit 1.
The speaker 5 generates sound through an amplifier 18 using an inverted signal every 128 pulses generated from the signal generator 7.

Next, when operating the electronic metronome according to the present invention with the above configuration, first slide the button 10 of the sliding control body 7 to set the scale to a desired tempo and beat, and then turn on the power. When turned on, the step motor 4 rotates step by step, and the tact rod 15 rotates within a range of 72 degrees every 128 pulses.
A continuous reciprocating operation is performed, and when the tact rod 15 is reversed, a sound is generated from the speaker 5.

Since the electronic metronome according to the present invention has the above-described structure and function, the tact bar can be operated electronically for a long time in exactly the same way as a conventional mechanical metronome, and the tact bar display The tempo and time signature can be confirmed with certainty due to the double effect of the and sound.

Also, since it is driven by a step motor,
There is no overrun during reversal operation, ensuring reliable reversal operation.Furthermore, since the speaker, power supply, and deceleration mechanism are located below, the center of gravity is lower than that of a mechanical metronome, making it stable even at high tempos. , which provides extremely accurate reciprocating motion.

[Brief explanation of the drawing]

The drawings show an electronic metronome according to the present invention. Fig. 1 is a front view, Fig. 2 is a side sectional view of Fig. 1, Fig. 3 is a sectional view showing main parts, and Fig. 4 is a cross-sectional view of Fig. 3. The front configuration diagram and FIG. 5 are circuit block diagrams showing the overall configuration. 1 is a frame body, 2 is a deceleration mechanism section, 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, 1
0 is a button, 11 is a casing body, 12 is a rotating shaft, 13 is a pinion, 14 is a sector gear, 15 is a tact, 16 is a relay gear, 16a is a large diameter gear, 16
b is the small diameter.

Claims (1)

[Scope of utility model registration request] A reduction mechanism consisting of a frame having an almost box-like shape as a whole, a step motor having a fan gear and pinion rotatably installed at the lower part of the frame, and an intermediate gear meshing with the pinion and the fan gear. a tact bar provided on the sector gear; a sliding control body provided on the front plate of the frame for setting a tempo or beat for the control circuit; and a speaker provided at the bottom of the frame. and a power source, and is configured to rotate the tact rod back and forth by forward and reverse rotation of the step motor.