JPH0977230A - Oscillating parts feeder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillating parts feeder device capable of suppressing the amplifying higher harmonic noise and surely realizing the muffling effect by ANC by providing a cylindrical body on the outer circumference of an oscillating parts feeder. SOLUTION: A sound passage 43 to guide outward the basic sound of the noise generated from a speaker arranged to a lower part of a parts feeder body 11 and the muffling sound to reverse the dilatation is formed between the speaker and the parts feeder body 11, and the driving frequency f1 of the driving current from a driving device 51 to drive the parts feeder body 11 is agreed with the primary resonant frequency fc1 generated inside. A cylindrical body 41 whose length H is set so that the resonant frequencies fc2 , fc3 , fc4 ... of higher order to be generated inside are not agreed with the higher harmonic frequencies of the noise f2 , fc , f4 ... is provided to surround the outer circumference of the parts feeder body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating parts feeder device for eliminating outward noise.

[0002]

[Prior art and its problems] The vibration parts feeder is
It is widely used to supply various parts in a predetermined posture to the next process, but recently, very small parts such as semiconductors and electronic parts (for example, 1 mm x 2 mm x 0.5 m).
There is an increasing number of cases in which a product having a size of about m) is handled. However, if such a component is transferred at a frequency of 50 Hz or 60 Hz, which is the same frequency as that of a conventional AC power source, the alignment action becomes difficult, so that the component is wound around the electromagnet driving section of the vibrating part feeder. The frequency of the alternating current supplied to the electromagnetic coil
For example, the bowl is torsionally vibrated at 300 Hz. In this case, the amplitude is also smaller than in the conventional case, and the above parts can be aligned without any problem and supplied to the next step. However, the level of sound generated by such a vibrating parts feeder is very high, and it is annoying, which causes pollution to the residents in the neighborhood.

However, in view of the above problems, the present applicant has
A vibrating parts feeder device 61 as shown in FIG. 5 has been developed. The vibrating parts feeder 62 of the vibrating parts feeder device 61 is composed of a movable part 62b that causes torsional vibration, a base block 62c that incorporates an electromagnet driving part 62ca, and an inclined leaf spring 62d that connects the movable part 62b and the base block 62c. ing. A drive current is supplied to the electromagnet drive unit 62ca at a drive frequency f ₁ from a drive device 51 connected to a commercial AC power supply 49 via an inverter 48. A cylindrical body 63 is arranged around the vibrating parts feeder 62 so as to surround the vibrating parts feeder 62, and noise between the vibrating parts feeder 62 and the cylindrical body 63 is reduced in the vicinity of the vibrating parts feeder 62. A sound path 64 for propagating the sound-deadening sound wave to the outside is formed. The sound-deadening sound wave is a sound wave that reverses the density of the noise of the vibrating parts feeder 62, and receives a signal from the gap sensor 32, which is a vibration detecting means, and is arranged in a recess in the surface plate 66 below the vibrating parts feeder 62. The sound path from the speaker 65
The vibration parts feeder 62 is led out to the outside through 64.
At the position of the muffling deviation detection microphone 45 provided obliquely above, noise is generated so as to be muffled. When the noise at that position is not zero, the muffling deviation detection microphone 45 sends a signal to the speaker 65 based on the signal from the gap sensor 32 that detects the amplitude related to the noise of the vibrating parts feeder 62. Supplying silence signal generator 34
Supply a signal to. The muffling signal generator 34, the gap sensor 32, and the like are designated by the same reference numerals as those in the embodiment of the present invention, and will be described in more detail in the embodiments described later.

Further, in the vibrating parts feeder device 61, the upper end portion 63a of the cylindrical body 63 and the vibrating parts feeder 6 are provided.
The outer peripheral upper end portion 62aa of the second bowl 62a has an R shape,
Since the cross section of the sound path 64 is shaped like a trumpet,
From the inside to the outside of the cylindrical body 63, the change in acoustic impedance is made smooth, that is, the reflection of sound at the opening end 64a is prevented, and the frequency characteristic inside the cylindrical body 63 is made flat.
The specific frequency of the sound wave is smoothly emitted to the outside without being emphasized. Further, when the upper end portion 63a of the cylindrical body 63 and the upper end portion 62aa of the bowl 62a are R-shaped in this way, the sound source diameter becomes large, the directivity of the sound becomes sharp, and the spread of the sound wave is suppressed. Can be reduced, that is, the muffling deviation detection microphone 45 is less likely to be affected by the environment in which the vibrating parts feeder device 61 is placed, and the noise can be reliably muffed by the muffling sound wave derived from the sound path 64 . , A better muffling effect is obtained.

On the other hand, when the cylinder 63 is attached, the cylinder 63
F _c = (λ × c) / (2 × π × H ′) ...
There is a resonance frequency f _c (Hz) determined by (1). Here, c is the speed of sound (340 m / s), H ′ is the length (m) of the cylindrical body 63 as shown in FIG. 5, and λ = n ×
π / 2 (n takes an odd multiple depending on the order),
That is, the resonance frequency f _c is determined by the length H ′ of the cylindrical body 63. In addition, if the resonance frequencies corresponding to the following are f _c1 , f _c2 , f _c3 , f _c4 , ...
First-order resonance frequency f _c1 and higher-order resonance frequencies f _c2 = ₃ f _c1 and f _c3 = 5 that are odd multiples of this first-order resonance frequency.
There exists f _c1 , f _c4 = 7f _c1 ,.

On the other hand, when the vibration transfer device such as the vibration parts feeder 62 is driven at the drive frequency f ₁ , the drive frequency f
Noise of fundamental wave sound f ₁ having the same frequency as ₁ (assuming that driving force of the same frequency is generated) and harmonic sound f ₂ (= 2f ₁ ), f ₃ (= 4f ₁ ), which is an even multiple thereof. f ₄ (=
6f ₁ ), ... Noise is present.

Inside the cylindrical body 63, in addition to the sound-deadening sound waves generated from the speaker 65, noise from the vibrating parts feeder 62 to be muted, that is, air in the gap 62e between the movable portion 62b and the base block 62c. Sound generated by being compressed and expanded due to vibration, and sound generated by the base block 62c and the base plate 62f torsionally vibrating due to the driving reaction force of the bowl 62a.
Furthermore, as these harmonics are present, as mentioned above,
If any of these match the resonance frequency in the cylinder 63,
A specific harmonic sound may be significantly increased and emitted to the outside. Further, since the cylindrical body 63 has a directional gain, the harmonic sound generated in the sound path 64 is uniformly amplified in its level and is emitted to the outside.

Therefore, the speaker 6 generates a sound-deadening sound wave that reverses the density of the noise generated from the vibrating parts feeder 62.
5, even if the noise is reduced by being guided to the outside through the sound path 64 , that is, even if the fundamental sound is reduced by active noise control (hereinafter referred to as ANC), the cross section of the sound path 64 is further reduced as described above. Even if the shape is a trumpet-like shape and a specific frequency is not emphasized at the opening end portion 64a and is less likely to be affected by the environment, a specific harmonic sound is greatly amplified, and The problem is that the noise level is not reduced.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and suppresses the increase of harmonic sound due to the attachment of a cylinder, and the ANC can surely muff the noise to surely reduce the total noise. An object of the present invention is to provide a vibrating parts feeder device capable of reducing the level.

[0010]

The above object is to provide a bowl having a spiral track formed on an inner peripheral wall thereof, and a base block having an electromagnet driving section disposed below the bowl fixed thereto. A vibrating parts feeder including an inclined leaf spring connecting the base block and the bowl, a driving device for supplying a driving current at a predetermined driving frequency to drive the electromagnet driving part, and the entire vibrating parts feeder. And a sound wave generating means for generating a sound deadening sound wave that inverts the density of the fundamental sound of the noise generated by the vibrating parts feeder, the sound deadening sound waves being the vibrating parts feeder and the cylindrical body. In a vibrating parts feeder device that is guided to the outside through a sound path formed by and, the resonance frequency with respect to the sound wave in the cylinder has a high noise level. So that it does not match the frequency of the sound of waves,
This is achieved by a vibrating parts feeder device characterized in that the driving frequency and / or the length of the cylinder are set.

Further, the above object is to provide a bowl having a spiral track formed on an inner peripheral wall portion thereof, and a base block having an electromagnet driving portion arranged below the bowl fixed thereto.
A vibrating parts feeder including an inclined leaf spring that connects the base block and the bowl, a driving device that supplies a driving current at a predetermined driving frequency to drive the electromagnet driving unit, and the entire vibrating parts feeder. And a sound wave generating means for generating a sound deadening sound wave that inverts the density of the fundamental sound of the noise generated by the vibrating parts feeder, the sound deadening sound waves being the vibrating parts feeder and the cylindrical body. In a vibrating parts feeder device configured to be guided to the outside through a sound path formed by, a vibrating parts feeder device characterized in that a wall portion of the sound path is subjected to sound absorption processing. To be achieved.

[0012]

According to the invention of claim 1, even if the cylindrical body is provided so as to surround the outer periphery of the vibrating parts feeder to form the sound path, the harmonic sound generated inside the cylindrical body is Since it does not match the resonance frequency, a specific high frequency is not amplified. On the other hand, the noise of the fundamental wave sound generated inside the cylindrical body can be reliably reduced by the silencing sound wave from the sound wave generating means. That is, since the muffling can be performed more effectively by the ANC, the overall noise level can be reliably reduced.

Further, according to the invention of claim 3, even if the cylindrical body is provided so as to surround the outer periphery of the vibrating parts feeder to form the sound path, by providing the sound absorbing material inside the sound path, Since the high frequency harmonic sound is absorbed by the sound absorbing material, the specific harmonic sound is not amplified. Further, since the sound-deadening sound wave having a low frequency is not absorbed by the sound absorbing material, the noise of the vibrating parts feeder can be reliably silenced by the ANC. Furthermore, when the sound absorbing process is applied to the inside of the cylinder, the directivity gain inside the cylinder is also reduced, so that the noise of the vibrating parts feeder can be further reduced.

[0014]

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

FIG. 1 shows a first embodiment of the present invention, and the vibrating parts feeder device is designated by 1 as a whole. The vibrating part feeder main body 11 of the vibrating part feeder device 1 is composed of an upper movable part 13, a lower base block 14, and inclined leaf springs 15 that connect these parts and are arranged at equal angular intervals. Upper movable part 13
Is a bowl 12 having a spiral track 12a formed inside and an R-shaped outer peripheral upper end, a movable core 17a integrally formed in the center of the lower surface of the bowl 12, and a movable core 17
The movable frame 17b covers the outer periphery of a.
A base plate 16 integral with the base block 14 is provided below the base block 14, and an upper portion of a bolt 33a attached to a vibration-proof rubber 33 is screwed and fixed to the base plate 16. A gap is provided between the movable frame 17b and the base block 14 so that the movable frame 17b does not hit the base block 14 even if the movable frame 17b receives torsional vibration.
19 are provided.

A movable core 17 is provided in the base block 14.
An electromagnet 18a, which is opposed to a with a gap and is wound with an electromagnetic coil 18b, is internally provided at a position above the base plate 16. When the driving current is supplied from the driving device 51 at the driving frequency f ₁ , the electromagnetic coil 18 generates a driving force having the same frequency as the driving frequency f ₁ and causes the movable portion 13 to torsionally vibrate. In addition, this drive device 51
The commercial AC power supply 49 supplies electric power adjusted by the inverter 48 to the high drive frequency f ₁ .

Below the main body 11 of the vibration parts feeder,
A board base 2 is provided, on which the diameter of the base plate 16
A larger circular recess 2a is formed, and the recess 2a
The baffle plate 21 is arranged so as to cover the outer peripheral side of the upper surface of the
Have been. The baffle plate 21 is a ring-shaped flat plate member.
However, it is attached to the vibration-proof rubber 33 at the inner peripheral edge.
The lower part of the bolt 33a is fixed by the nut n.
I have. In addition, in the center hole 21a of the baffle plate 21, a sound wave
The upper edge frame 23 of the speaker 22 which is the generation means is fixed
Although the speaker 22 has a known structure,
A plurality of openings 22a are formed in the peripheral portion at equal angular intervals.
The drive portion 22b having a voice coil in the lower portion is provided with the recess 2a.
It is arranged inside. With the above configuration, the recess 2
a is a closed space25And the conical shape of the speaker 22
The rear surface of the plate-shaped diaphragm 24 faces. Closed space25
Is the diaphragm 2 when the speaker 22 generates a sound wave for muffling.
Some volume so that it does not become a large resistance to the vibration of 4
It is a space with.

On the outer periphery of the vibrating parts feeder main body 11,
A tubular body 41 arranged concentrically with this is provided, and a flange portion 41a is formed below the tubular body 41, and the flange portion 41a is provided on the baffle plate 21 described above.
At the same time, the bolts 31 are fastened to the surface table 2 together. Further, an R-shaped annular member 42 having an R shape is fixed to the upper end of the cylindrical body 41. In this embodiment,
The length H of the cylinder 41 is adjusted so that the primary resonance frequency f _c1 inside the sound path 43 matches the drive frequency f ₁ of the current that drives the electromagnetic coil 18 of the vibrating part feeder body 11. For example, when the driving frequency f ₁ of the vibrating parts feeder main body 11 is driven at 300 Hz which is close to the resonance frequency of the vibrating parts feeder main body 11, the length H of the tubular body 41 is set to 283 mm from the above formula (1). Is set. Further, between the cylindrical body 41 and the side peripheral portion of the vibrating parts feeder main body 11, there is a sound path 43 through which the silenced sound wave from the speaker 22 is led to the outside. This sound path 43 is
Similar to the conventional example, the cross section thereof has a trumpet shape due to the upper end of the R-shaped annular member 42 and the outer peripheral upper end of the bowl 12, and as described above, the sound wave is smoothly guided to the outside and a specific frequency is emphasized. Do not try to avoid it and make it less susceptible to environmental influences.

On the other hand, above the base block 14, a gap sensor 32 is attached as a non-contact detecting means for vibration which becomes a fundamental sound of noise. The gap sensor 32 detects the vibration of the vibrating parts feeder main body 11 by measuring the deflection of the inclined leaf spring 15 due to the torsional vibration of the inclined leaf spring 15, and the detection output signal is sent to the silence signal generator 34. Is being supplied. On the other hand,
A muffling deviation detection microphone 45 is provided diagonally above the vibrating parts feeder main body 11, and a detection signal of the muffling deviation detection microphone 45 is also supplied to the muffling signal generator 34. With these signals, the drive signal obtained by the algorithm shown in FIG. 2 is supplied to the voice coil of the drive unit 22b of the speaker 22.

Next, referring to FIG. 2, the muffling signal generator 34
Will be described in detail. The analog output of the gap sensor 32 is amplified by the amplifier 35 and supplied to the A / D converter 36, where the analog value is converted into a digital value, and the result is supplied to the adaptive algorithm 37 and the adaptive filter 38. Adaptive algorithm 3
Reference numeral 7 changes the constant and the transfer function of the adaptive filter 38 in accordance with parameters that change with time in an actual noise environment, such as atmospheric pressure, temperature, humidity, sound pressure and frequency components. As a result, a sound wave signal is generated so that a sound wave having the same level as the sound wave as noise but having a different density is obtained at the position of the muffling deviation detection microphone 45. In the D / A converter 39 to which this sound wave signal is supplied, the digital input is converted into an analog output, and this is converted into an amplifier 40.
Is amplified by and is supplied to the speaker 22. As a result, the noise transmitted from the vibrating parts feeder main body 11 can be made substantially zero at the position of the muffling deviation detection microphone 45. However, when it does not become zero at the position of the muffling deviation detection microphone 45, the muffling deviation detection microphone 45 detects the sound wave as an analog output, and this analog output is detected by the amplifier 4
The signal is amplified by 6, converted into a digital value by the A / D converter 47, and supplied to the above-mentioned adaptive algorithm 37, where a predetermined calculation is performed. That is, if the sound wave is not zero at the position of the muffling deviation detection microphone 45, this is corrected.

Although this embodiment is constructed as described above,
Next, this operation will be described.

Since the primary resonance frequency f _c1 inside the cylindrical body 41 is made the same as the driving frequency f ₁ of the vibrating parts feeder main body 11, the harmonic sound of the vibrating parts feeder main body 11 (this is the driving frequency f ₁ as described above). an even multiple of the _{frequency) f 2, f 3, f} 4, and noise of ..., the higher order resonant frequency of the cylinder body 41 (which is an odd multiple of the frequency of the resonant frequency f _c1) f _C2 , _fc3 , _fc4 , ... Do not match, and a specific harmonic sound is not amplified in the sound path 43 . In this case, although the sound pressure level at the outside of the basic waves of the noise having the same frequency as the drive frequency f ₁ is able to vertically slightly, which the density in the basic sound of waves f ₁ and the frequency Since the reversed sound-deadening sound wave is generated from the speaker 22, the sound can be surely muted.

In this embodiment, since the sound deadening sound wave generated from the speaker 22 matches the resonance frequency inside the cylindrical body 41, the efficiency of generating the sound deadening sound wave becomes very high. Therefore, the current supplied to the speaker 22 can be reduced as compared with the conventional case, so that the driving energy for the speaker 22 can be reduced and the vibrating parts feeder main body 1 can be efficiently used.
The noise from 1 can be eliminated.

In this embodiment, the drive frequency f ₁ and the primary resonance frequency f in the cylinder 41 are changed by changing the length H of the cylinder 41 from the conventional one, that is, by a mechanical method.
I tried to match _c1 , but the vibration parts feeder 62
In the conventional vibrating parts feeder device 61 having the cylindrical body 63 surrounding the outer circumference of the vibrating parts feeder 61, the drive frequency f ₁ given to the vibrating parts feeder 62 is changed by adjusting the inverter 48 without changing the length of the cylindrical body 63. , Unless the vibration frequency of the vibration parts feeder 62 is significantly deviated,
Drive frequency f ₁ and primary resonance frequency f _c1 inside the cylinder 63
You may make it match with.

In this embodiment, the drive frequency f ₁ is
That is, the fundamental sound of noise is made to match the primary resonance frequency f _c1 in the cylindrical body 41, but this drive frequency f _{1 is set} to the higher resonance frequencies f _c2 , f _c3 , f _c4 ... Of the cylindrical body 41.・ Even if they match with, harmonics of noise f ₂ , f ₃ , f
_{Since 4} ... does not match any of the above resonance frequencies, a specific harmonic sound is not amplified, and the generation efficiency of silencing sound waves can be further increased, and the same effect as the above-mentioned embodiment Can be played.

Next, a second embodiment will be described with reference to FIG. 3. The vibrating parts feeder device of the second embodiment is indicated by 3 as a whole, and the same structure as that of the first embodiment is the same. Reference numerals are given and detailed description thereof is omitted. That is, in the second embodiment, the sound absorbing material 44 made of, for example, a felt material is attached to the inner wall of the cylindrical body 41.

In general, the sound absorbing material 44 is more likely to absorb high frequencies than low frequencies, that is, the sound absorbing effect of the sound absorbing material 44 is high at high frequencies. Inside the tubular body 41, the gap 1 between the movable frame 17b and the base block 14
The high-frequency noise of the noise generated when the air of 9 is compressed and expanded by the vibration and the noise generated when the base block 14 and the base plate 16 themselves are torsionally vibrated by the reaction force of the bowl 12 are Effectively absorbed by 44. At the same time, since the low frequency sound-deadening sound wave generated from the speaker 22 is guided to the outside without being absorbed by the sound absorbing material 44, ANC can be performed reliably.
The overall noise can be reliably reduced.

In this embodiment, the sound absorbing material 44 is attached to the inner wall of the cylindrical body 41. However, in order to enhance the sound absorbing effect, the sound absorbing material 44 is attached to the outer wall of the base block 14 or the base plate 16.
You may attach it to.

Further, in this embodiment, the sound absorbing material of felt material is used, but other sound absorbing material such as sponge may be used as the sound absorbing material.

Next, a third embodiment will be described with reference to FIG. 4. The vibrating parts feeder device of the present embodiment is indicated by 5 as a whole, and the same components as those of the second embodiment are designated by the same reference numerals. Will be attached and detailed description thereof will be omitted.

That is, in this embodiment, a disc-shaped reflecting plate 53 extending radially inward from the cylindrical body 41 is provided in the vicinity of the bowl 12 integrally with the cylindrical body 41. A ring-shaped small gap S is provided between the and the outer wall of the vibrating parts feeder body 11. Since the gap S is small, noise having a lower frequency such as a fundamental sound wave is more likely to pass, and noise having a higher frequency such as a harmonic wave is less likely to pass. That is, the reflector 53
Forms a mechanical low pass filter the cylindrical body 41 by the mounted, therefore, harmonics generated inside the sound path 43 sound of waves _{f 2, f 3, f 4} ··· is downward by the reflective plate 53 The sound absorbing material 44 that is reflected and does not leak to the outside from above the tubular body 41 and is attached to the inner wall portion of the tubular body 41.
Is absorbed by. Furthermore, since the sound-deadening sound wave generated from the speaker 22 has a low frequency, it is emitted to the outside of the sound path 43 from the gap S without being reflected by the reflector 53. That is, the harmonic sounds f ₂ , f ₃ , f _4, ... Of the noise are not emitted to the outside, and only the fundamental sound f _{1 of the} noise and low-frequency sound waves such as silencing sound waves having the same frequency as the noise are sent to the outside. Therefore, ANC can be reliably performed, and the overall noise level can be reliably reduced. The frequency of the sound waves passing through the gap S is so determined by the size of the gap S, depending on the frequency of the mute sound waves, or gap S in accordance with the driving frequency f ₁ of the vibratory parts feeder
Should be set. Further, in the present embodiment, since the sound absorbing material 44 is provided in the sound path 43 , the directivity gain inside the cylindrical body 41 is suppressed, so that the high frequency noise generated from inside the cylindrical body 41 is entirely reduced.

In this embodiment, the sound absorbing material 44a is also attached above the reflecting plate 53.
It is for absorbing the high frequency sounds f ₂ , f ₃ , f _4, ... Leaked from S.

Further, in this embodiment, the high frequency sounds f ₂ , f ₃ ,
The sound absorbing material is not attached to the lower surface of the reflecting plate 53 so that f ₄ ... Is reflected downward, but the sound absorbing material is attached to the lower surface of the reflecting plate 53, that is, even if the sound absorbing material is attached here. good.

As described above, in any of the above embodiments, the harmonic sound of the noise generated inside the cylindrical body 41 can be reduced without reducing the muffling sound wave generated from the speaker 22, so that the ANC is reliably performed. Therefore, the overall noise level can be reliably reduced.

In the above embodiment, the bowl 1
A spiral track 12a is formed in the track 2, and as is well known, a part of the track 12a is provided with various parts feeding means in proximity to or attached thereto, but these will not be described at all. I didn't. However, in actuality, with these, the parts placed in the bowl 12 are placed in a predetermined posture, and from the portion located at the uppermost end of the track 12a, the cylindrical body is disposed concentrically outside the bowl 12. It is discharged to the outside beyond the upper end of 41. As this means, for example, a linear track that is directly connected to the discharge end of the spiral track 12a is integrally formed, and one of the cylinders 41 is The component may be discharged to the outside from the outer end thereof through the notch formed in the portion. In this case, of course, as it is between the vibrating part feeder 11 and the cylindrical body 41 an annular sound path 43 is formed, the resonance characteristic as described above to the sound path 43 is not impaired, in a plane A member having a shape corresponding to the linear discharge track symmetrically when viewed may be attached, for example, every 120 degrees so as not to impair the resonating acoustic characteristic. Of course, compared to the cross-sectional area of the ring-shaped sound path 43 ,
If the occupied area of the linear track portion occupying at the upper end portion is small, and if the wavelength of the silencing sound wave is sufficiently long, its acoustic characteristics are not impaired.

Although the respective embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the first embodiment, the drive frequency f ₁ and the primary resonance frequency f _c1 inside the cylinder 41 are made to coincide with each other, and the higher resonance frequencies f _c2 , f _c3 inside the cylinder 41, f
_c4, but to adjust the harmonic sound of waves f _2, f _3, the length H of f ₄ driven so ... it does not match the frequency f ₁ and / or the tubular body 41 of the noise to ..., and the driving frequency f ₁ Even if the primary resonance frequency f _c1 inside the tubular body 41 does not match, the tubular body 41
If the higher harmonic resonance frequencies f _c2 , f _c3 , f _c4 , ... Do not match the harmonic sound frequencies f ₂ , f ₃ , f _4, ... If the first-order resonance frequency f _{c1 is set} to 1.5 times or 3 times the driving frequency f ₁ , a specific harmonic sound is not amplified.
The noise can be surely reduced.

Further, in the above embodiments, since the discharge end of the truck is not shown, the truck 1 between the embodiments is not shown.
Although the upper end of 28 is slightly different, it has no effect on the acoustic characteristics described above. In the above embodiment, one speaker 22 is provided below the central portion of the vibrating parts feeder 11, but the ring-shaped sound path 42 is divided into, for example, three spaces at equal angular intervals, and the bottom of each of them is divided. Even if three speakers are provided, that is, three speakers are provided, the effect of the present invention is not lost.

[0039] In the first embodiment of this case and said, since the noise generated by the cylindrical body 41 for the tubular body 41 has a directional gain is to be amplified, sound absorption in the sound path 43 The material 44 may be attached to reduce the noise amplified by this directional gain.

Further, in the above embodiment, the drive device 51 for supplying the drive current at the drive frequency f ₁ and the muffling signal generator 34 for generating the muffling sound wave are separately provided. Based on the output signal from the gap sensor 32, which is a means for detecting the amplitude, the driving frequency f ₁ is adjusted at any time in the same manner as the sound-deadening sound wave, and harmonic noises f ₂ , f ₃ , f ₄ , ... _May not match the resonance frequencies f _C1 , f _C2 , f _C3 , f _C4 , ... Of the cylinder 41.

In the above embodiment, the speaker 22 is used as the sound wave generating means. Instead of this, a vibration plate is attached to an actuator (for example, a piezoelectric element) that generates a vibration force by energizing an alternating current. A sound wave generated by vibration may be used.

Although the gap sensor 32 is used as a means for detecting the noise of the vibrating parts feeder main body 11 in the above embodiment, the noise may be detected by a microphone instead of the gap sensor 32, or the vibration pickup may be used as a movable frame. 17b
Alternatively, the vibration may be detected by fixing it to.

Further, in the above embodiment, the case where the vibrating parts feeder main body 11 is driven at the driving frequency f ₁ having a high frequency such as 300 Hz has been described. However, the driving frequency f ₁ is 50 Hz as in the conventional case. Even when driven at a low frequency of 60 Hz, the present invention can be applied to the case where the provision of the cylinder increases the specific harmonic sound and cannot reduce the overall noise. is there. In this case, the driving device 5 that generates the driving frequency
Since the power from the commercial AC power source may be half-wave rectified and supplied to the first unit, the inverter for setting the drive frequency can be eliminated. Incidentally, if the full-wave rectifying the power from the commercial AC power source, it is possible to obtain a frequency twice the frequency of the commercial AC power source, for example, the driving frequency f ₁ 100H
In the case of z, the inverter can be unnecessary.

Further, in the above-mentioned embodiments, the vibrating parts feeder devices 1, 3, in which the speaker 22 is arranged as the sound wave generating means in the surface table 2 below the vibrating parts feeder body 11.
5 is described, but if the speaker is arranged at the lower end of the sound path formed between the vibrating parts feeder main body and the cylindrical body below the vibrating parts feeder main body, the speaker in the surface plate stand It can also be applied to a vibrating parts feeder device that does not have.

Further, in the above embodiment, the height of the vibration-proof rubber 33 as the vibration-proof mechanism is constant, but the height can be adjusted with respect to the floor on which the vibration parts feeder is installed as the vibration-proof mechanism. There is something. In the vibrating parts feeder having such a configuration, the height from the floor may be adjusted by adjusting the height of the anti-vibration mechanism. The coefficient of the adaptive filter is adjusted so that the output of the muffling deviation microphone 45 becomes 0. However, of course, the higher the muffling level of the muffling sound wave, the greater the muffling effect, that is, the sound path 42 described above. It may be moved up and down in order to precisely adjust the height H of the.
Further, in the above modified example, when a muffling speaker is provided on each of the bottom walls of a plurality of partitioned spaces, when the noise source includes a plurality of components as the main muffling frequency components, these speakers are used. The height from to the upper end of the cylindrical body may be adjusted, or the height may be changed and fixed so that the plurality of main frequency components resonate. Further, in the above embodiment, the frequency of the drive current supplied to the coil of the electromagnet is adjusted to the air column resonance frequency determined by the height of the sound path 42. However, in the case of having a plurality of main frequency components, According to this modification, the frequency component generated from each muffling speaker includes this main frequency component, and it is clear that each air column resonance can muffle the sound more efficiently than before.

[0046]

As described above, according to the vibrating parts feeder device of the present invention, since the amplification of the higher harmonics is suppressed, the noise can be surely suppressed by the ANC, and the total noise level is surely ensured. It can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a vibrating parts feeder device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a muffling signal generator according to the first embodiment of the present invention.

FIG. 3 is a partially cutaway sectional view of a vibrating parts feeder device according to a second embodiment of the present invention.

FIG. 4 is a partially cutaway sectional view of a vibrating parts feeder device according to a third embodiment of the present invention.

FIG. 5 is a partially cutaway sectional view of a vibrating parts feeder device according to a conventional example.

[Explanation of symbols]

1 Vibration Parts Feeder Device 2 Surface Plate Stand 3 Vibration Parts Feeder Device 4 Vibration Parts Feeder Device 11 Vibration Parts Feeder Main Body 12 Bowl 14 Base Block 15 Inclined Leaf Spring 22 Speaker 34 Muffling Signal Generator 41 Cylindrical Body 43 Sound Path 44 Sound Absorbing Material 51 Drive unit 53 Reflector H Length of cylinder

Claims (4)

[Claims] 1. A bowl having a spiral track formed on an inner peripheral wall thereof, a base block fixed to an electromagnet driving portion disposed below the bowl, and the base block and the bowl are coupled to each other. A vibrating parts feeder including an inclined leaf spring, a driving device that supplies a driving current at a predetermined driving frequency to drive the electromagnet driving section, a tubular body that surrounds the outer circumference of the entire vibrating parts feeder, The vibrating part feeder is composed of sound wave generating means for generating a sound deadening sound wave that reverses the density of the fundamental wave sound, and the sound deadening sound wave passes through the sound path formed by the vibrating part feeder and the cylindrical body. In a vibrating parts feeder device which is arranged to be led out to the outside, the resonance frequency for the sound wave in the cylinder does not match the frequency of the harmonic sound of the noise. A vibrating parts feeder device characterized in that the driving frequency and / or the length of the cylinder are set. 2. The resonance frequency is made to match the frequency of the fundamental sound of the noise.
The vibration parts feeder device described in. 3. A bowl having a spiral track formed on an inner peripheral wall portion thereof, a base block fixed to an electromagnet driving portion disposed below the bowl, and the base block and the bowl are coupled to each other. A vibrating parts feeder including an inclined leaf spring, a driving device that supplies a driving current at a predetermined driving frequency to drive the electromagnet driving section, a tubular body that surrounds the outer circumference of the entire vibrating parts feeder, The vibrating part feeder is composed of sound wave generating means for generating a sound deadening sound wave that reverses the density of the fundamental wave sound, and the sound deadening sound wave passes through the sound path formed by the vibrating part feeder and the cylindrical body. A vibrating parts feeder device which is adapted to be led out to the outside, wherein a sound absorbing process is applied to a wall portion of the sound path. 4. A reflecting plate, which has a ring-shaped and constant gap between the vibrating parts feeder and the vibrating parts feeder, is fixedly provided on the inner wall portion of the cylindrical body near the bowl. The vibration parts feeder device according to claim 3.