Abstract:
A dust remover which comprises a power supply and an electrode applied with voltage by said power supply. The dust attached to the object of dust removal is removed therefrom by bringing the electrode into contact with the object of dust removal or approaching toward the object of dust removal. The object of dust removal is a conductor and/or an insulator. The voltage applied to said electrode is a pulsed voltage of plus and minus or an AC voltage of plus and minus. Or the voltage is a DC voltage having the same polarity with that of electricity with which the dust is charged, or the voltage is a DC voltage having an opposite polarity to that of electricity with which the dust is charged. The object of dust removal includes at least a ball for “Pachinko”, a car body, a printed board, a metal box or a part thereof, a frame for glasses, a plastic lens, a plastic box or a part thereof, a fiber, a wood, a paper box or a part thereof.

Description:
[0001]    This divisional U.S. Patent Application claims the benefit of priority of the prior U.S. patent application Ser. No. 11/739,278 filed on Apr. 24, 2007, of the same title, by the same inventor. 
     
    
     TECHNICAL FIELD 
       [0002]    This invention generally relates to a dust remover or dust removal device, and more particularly, to a dust remover for removing dust by coulombic reaction force or attraction force generated by application of voltage. 
       BACKGROUND OF INVENTION 
       [0003]    Conventional dust removers include:
       (1) a system in which dust is mechanically wiped away with a brush,   (2) a system in which dust is scraped away with an adhesive tape or an adhesive roller,   (3) a system in which dust is blown away by air blow or fan blow,   (4) a system in which dust is sucked in by vacuum suction,   (5) a system in which supersonic vibration is applied to facilitate the scraping of dust, and   (6) a system in which static charge is removed using a static eliminator to facilitate the scraping of dust, and the like       
 
         [0010]    As mentioned above, with the conventional contact type of dust removal systems, dust is wiped away with a brush, or dust is scraped away with an adhesive tape. In these cases dust is difficult to remove or dust is adhered again at once since static charge is generated inevitably. Furthermore, with the conventional non-contact type of dust removal systems, since air blow is used to blow dust away, the re-adhesion of dust is promoted. In particular since the air blow or fan blow is not used under the clean atmosphere such as clean room or clean bench the non-contact dust removing is difficult. 
         [0011]    Therefore, it is an object of the present invention to provide a dust remover which overcomes the above-mentioned disadvantages. 
       SUMMARY OF INVENTION 
       [0012]    To accomplish the object, there is provided a dust remover which comprises a power supply and an electrode applied with voltage by said power supply, in which the dust attached to the object of dust removal is removed therefrom by bringing said electrode into contact with the object of dust removal or approaching toward the object of dust removal. 
         [0013]    There is also provided a dust remover for balls for use in “Pachinko” game or for coins for use in a game machine which comprises an entrance gate for introducing balls or coins, an electrode disposed so that the introduced balls or coins are brought into contact with or approached the electrode, said electrode being electrically isolated from the other parts and applied with the voltage to remove the dust, a discharge gate for discharging the balls or coins, a first isolator for separating the balls or coins on or adjacent said electrode from the others in the entrance gate and transferring the separated balls or coins toward said electrode, a second isolator for separating the balls or coins in the discharge gate from the balls or coins on or adjacent said electrode and transferring the balls or coins toward said discharge gate. 
         [0014]    There is also provided a dust remover which comprises a dust repelling electrode which is disposed in contact with or adjacent the object of dust removal and fed by a power supply, and an ionizer for issuing ions toward the circumference of the object of dust removal. 
         [0015]    There is also provided a dust remover which comprises a dust repelling electrode which is disposed in contact with or adjacent the object of dust removal and fed by a power supply, and a dust attracting opposite electrode disposed on the opposite side of said dust repelling electrode and separated therefrom. 
         [0016]    There is also provided a dust remover which comprises a dust suction vacuum device for sucking the departed dust in from a dust attracting electrode for attracting the dust, and a dust attracting electrode for attracting the dust, and/or a dust repelling electrode for flying and floating the dust from the object of dust removal. 
         [0017]    There is also provided a dust remover which comprises an air blower for flying the dust away, a dust attracting electrode for attracting the dust, and/or a dust repelling electrode for flying and floating the dust from the object of dust removal. 
         [0018]    There is also provided a dust remover which comprises a dust flying-away fan and/or air blower disposed in an upper stream, a dust repelling electrode disposed in a downstream from the fan and/or the blower, a dust attracting electrode disposed in a further downstream from the object of dust removal, and a dust suction fan at the end of the stream. 
         [0019]    Other objects, features, and advantages of the present invention will be explained in the following detailed description of the invention having reference to the appended drawings: 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0020]      FIG. 1  is a view for explanation on mechanism of dust removal in case that the object of dust removal is a conductor, in which  FIG. 1   a  shows the state that the dust is attached to the object of dust removal,  FIG. 1   b  is a view for explanation on mechanism of non-contact system for dust removal, and  FIG. 1   c  is a view for explanation on mechanism of contact system for dust removal. 
           [0021]      FIG. 2  is a view for explanation on mechanism of dust removal in case that the object of dust removal is an insulator, in which  FIG. 2   a  shows the state that the dust is attached to the object of dust removal,  FIG. 2   b  is a view for explanation on the mechanism in which the dust is removed from the side that dust is attached, and 
           [0022]      FIG. 2   c  is a view for explanation on the mechanism in which the dust is removed from the side opposite to that dust is attached. 
           [0023]      FIG. 3  is a view for explanation on types of voltage applied to remove dust, in which  FIG. 3   a  shows the state that the dust is attached to the object of dust removal,  FIG. 3   b  shows that the applied voltage is a pulse DC,  FIG. 3   c  shows that the applied voltage is AC, and  FIG. 3   d  shows that the applied voltage is a plus DC, and  FIG. 3   e  shows that the applied voltage is a minus DC. 
           [0024]      FIG. 4  is a view for explanation on the case in which the object of dust removal is a car body. 
           [0025]      FIG. 5  is a view for explanation on the case in which the object of dust removal is a ball for use in the game “Pachinko”. 
           [0026]      FIG. 6  is a view for explanation on the case in which the object of dust removal is a printed board. 
           [0027]      FIG. 7  is a view for explanation on the case in which the object of dust removal is a metal box. 
           [0028]      FIG. 8  is a view for explanation on the case in which the object of dust removal is an insulator such as plastic, in which  FIG. 8   a  is a view showing the electrode moved toward the plastic from the side opposite to the dust, and  FIG. 8   b  is a view showing the electrode moved toward the plastic from the side the dust is attached to. 
           [0029]      FIG. 9  is a view for explanation on the case in which the object of dust removal is a plastic or a glass lens, in which  FIG. 9   a  shows the electrode moved toward the dust from the opposite side of the lens, and  FIG. 9   b  shows the electrode moved toward the dust from the side the dust is attached to. 
           [0030]      FIG. 10  is a view for more detailed explanation on the dust remover for removing dust from the balls for use in the game “Pachinko”. 
           [0031]      FIG. 11  is a view for explanation on phenomenon of dust return. 
           [0032]      FIG. 12  is a view showing the dust remover of the 11th embodiment. 
           [0033]      FIG. 13  is a view showing the dust remover of the 12th embodiment,  FIG. 13   a  shows the state that the dust is attached to the object of dust removal, and  FIG. 13   b  shows the state that the dust is removed from the object of dust removal. 
           [0034]      FIG. 14  is a view showing the dust remover of the 13th embodiment. 
           [0035]      FIG. 15  is a perspective view showing more detailed examples of electrodes, that is, dust repelling electrode and dust attracting electrode, in which  FIG. 15(   a ) shows a needle shape electrode,  FIG. 15(   b ) shows a one dimensional array of needle shape electrodes,  FIG. 15(   c ) shows a two dimensional array of needle shape electrodes,  FIG. 15(   d ) shows a rod electrode,  FIG. 15(   e ) shows a line or rod-like shape,  FIG. 15(   f ) shows a mesh shape,  FIG. 15(   g ) shows a plate-like shape and  FIG. 15(   h ) shows a ring shape. 
           [0036]      FIG. 16  is a view showing three examples of the dust remover provided with a dust suction device according to the 15th embodiment, in which  FIGS. 16   a  and  16   b  show the examples in which a dust suction vacuum device and a dust attracting electrode are disposed on the same side of the object of dust removal, and  FIG. 16   c  shows the example in which a dust suction vacuum device and a dust attracting electrode are disposed on the opposite side of the object of dust removal. 
           [0037]      FIG. 17  is a view showing a dust remover provided with an air blower according to 16th embodiment, in which  FIG. 17   a  shows the case in which a dust attracting electrode and an air nozzle of air blower are disposed on the same side of the object of dust removal, and  FIG. 17   b  shows the case in which a dust repelling electrode and an air nozzle of air blower are disposed on the opposite side of the object of dust removal. 
           [0038]      FIG. 18  is a view showing the dust remover according to 17th embodiment. 
           [0039]      FIG. 19  is a view showing the embodiment in which the object of dust removal is a car body, in which  FIG. 19   a  shows the dust removal mechanism of the car body corresponding to the embodiment shown in  FIG. 16   c  and  FIG. 19   b  shows the dust removal mechanism of the car body corresponding to the embodiment shown in  FIG. 17   b.    
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     First Embodiment 
       [0040]      FIG. 1  is a view for explanation on mechanism of dust removal in case that the object of dust removal is a conductor,  FIG. 1   a  shows the state that the dust is attached to the object of dust removal,  FIG. 1   b  is a view for explanation on mechanism of non-contact system for dust removal. Although, for clarity of principle, in  FIG. 1  the object of dust removal and dust are separately shown to show plus electric charge, minus electric charge, and electric flux line, in fact the dust is attached to the object of dust removal. In  FIGS. 2 and 3  the object of dust removal and dust are shown the same as that of  FIG. 1 . 
         [0041]    In  FIG. 1   a,  when the dust  12  charged with plus electricity  14  approaches to or is attached to the object of dust removal, equal quantity of plus electricity  14  and minus electricity  16  are induced inside the object of dust removal. While the minus electricity  16  thus induced moves to the position adjacent the dust, the plus electricity  14  is pushed toward the opposite side. The plus electricity  14  with which the approached dust is charged and the minus electricity  16  inside the object of dust removal are attracted to each other due to the generated attracting force and then the dust is attached to the object of dust removal. 
         [0042]    Now considering electric flux line, the electric flux lines coming out from the plus electricity  14  of dust are terminated at the minus electricity  16 , and thus the electric flux lines are closed. Assuming that a static eliminator in which plus ions and minus ions are generated to remove electricity or electric charge from the object of dust removal by applying ions thereto is used to remove the dust, that is, plus ions  20  and minus ions  22  are supplied to the object of dust removal, plus electricity  14  or minus electricity is not affected by plus ions  20  and minus ions  22  since the electric flux lines are closed. Consequently the dust can not be removed. 
         [0043]    In  FIG. 1   b,  when the electrode  30  charged with plus electricity by a power supply  32  is approximated to or comes close to the object of dust removal  10  (non-contact), if the voltage of the electrode is high enough, the attracting force of minus electricity  16  within the object of dust removal induced by the electrode overcomes the attracting force induced by plus electricity  14  with which the dust  12  is charged, and thus is attracted to the side of the electrode  30 . Consequently the plus electricity moves to the dust side within the object of dust removal. The plus electricity thus moved and the plus electricity  14  of the dust  12  repel to each other. As a result the dust is flied away as shown by an arrow A and then removed from the object of dust removal. 
         [0044]    Considering electric flux line, the plus electricity  14  of the object of dust removal and the plus electricity  14  of the dust are terminated without being closed. In case that the electric flux line is not closed, repulsive force works. 
         [0045]    In  FIG. 1   c,  the object of dust removal is brought into contact with the electrode  30  which is charged with plus electricity by the power supply  32 . At that time, if the electrode  30  is applied with plus voltage sufficiently to overcome the attracting force induced by the dust, the object of dust removal is made to be charged with plus electricity. In a similar way to the reason explained associated with  FIG. 1   b,  the repulsive force is generated between the plus electricity  14  of the dust  12  and the plus electricity  14  of the object of dust removal  10  to fly the dust  12  away from the object of dust removal  10  as shown by an arrow A. 
       Second Embodiment 
       [0046]      FIG. 2  is a view for explanation on mechanism of dust removal in case that the object of dust removal is an insulator,  FIG. 2   a  shows the state that the dust is attached to the object of dust removal,  FIG. 2   b  is a view for explanation on the mechanism in which the dust is removed from the side dust is attached and  FIG. 2   c  is a view for explanation on the mechanism in which the dust is removed from the side opposite to that dust is attached. 
         [0047]    In  FIG. 2   a , when the dust  12  charged with plus electricity  14  approaches to an insulator  40 , that is, the object of dust removal charged with minus electricity  16 , the dust  12  and the object of dust removal  40  attract to each other due to the attracting force generated between the plus electricity  14  with which the dust is charged and the minus electricity  16  with which the object of dust removal is charged, and as a result the dust  12  is attached to the object of dust removal  40 . 
         [0048]    In  FIG. 2   b , when the electrode  30  applied with minus voltage is moved toward the side the dust  12  is attached (non-contact), if the voltage applied to the electrode  30  is high enough, the attracting force due to the minus voltage generated by the electrode  30  overcomes the attracting force due to minus electricity  16  with which the object of dust removal  40  is charged and therefore the minus voltage generated by the electrode  30  attracts plus electricity with which the dust is charged. Consequently the dust  12  is removed from the object of dust removal  40 . 
         [0049]    In  FIG. 2   c , when the electrode  30  is moved toward the object of dust removal  40  from the side opposite to the dust  12 , if the electrode  30  is applied with plus voltage which overcomes the attracting force between the object of dust removal and the dust, the plus electricity applied by the electrode  30  repels plus electricity with which the dust  12  is charged and then flies the dust away. 
       Third Embodiment 
       [0050]      FIG. 3  is a view for explanation on types of voltage applied to remove dust,  FIG. 3   a  shows the state that the dust is attached to the object of dust removal,  FIG. 3   b  shows that the applied voltage is a pulse DC,  FIG. 3   c  shows that the applied voltage is a AC,  FIG. 3   d  shows that the applied voltage is a plus DC, and  FIG. 3   e  shows that the applied voltage is a minus DC. 
         [0051]    In  FIG. 3 , the electric charge or electricity with which the dust is charged is in general of plus and/or minus polarity. In order to remove the dust  12  the voltage of plus and/or minus polarity is required. For this reason, a pulse DC, an AC or alternate current, plus DC or plus direct current, or minus DC is used. 
         [0052]    Furthermore, although  FIG. 3   a  shows that the voltage is applied while the electrode  30  is in contact with the conductor, or the object of dust removal  10 . As the object of dust removal, either of a conductor and an insulator can be adopted, and similar voltages can be applied without contact as well to remove the dust  12 , as explained in the first and second embodiments. 
       4th Embodiment 
       [0053]    On and after the 4th embodiment, specific objects of dust removal will be explained.  FIG. 4  is a view for explanation on the case in which the object of dust removal is a car body. Conventional dust removers for car include:
       (1) a system in which the dust is flied away using an air blower or a fan blower,   (2) a system in which the dust is sucked in by vacuum suction,   (3) a system in which supersonic vibration is applied to facilitate the scraping of dust, and   (4) a system in which static charge is removed using a static eliminator to facilitate the scraping of dust, and the like       
 
         [0058]    However, there is no dust remover which can remove the dust completely and therefore once the dust is attached to the car body, the dust is hardly removed under the conventional way. 
         [0059]    In  FIG. 4 , a car body  50  is disposed above a carriage  54  through an insulator  52 . The car body is transferred on a rail  56  and then is brought into the position where the dust is removed. The electrode, not shown, is brought in contact with or moved toward the car body  50  and then the pulsed voltage is applied. Consequently the dust is flied away as shown by an arrow A. 
       5th Embodiment 
       [0060]      FIG. 5  is a view for explanation on the case in which the object of dust removal is a ball for use in the game “Pachinko”. In  FIG. 5 , the dust is flied away as shown by arrows A by applying the voltage to balls  60  or moving the electrode  30  toward the balls. 
       6th Embodiment 
       [0061]      FIG. 6  is a view for explanation on the case in which the object of dust removal is a printed board. In  FIG. 6  the dust which is attached to the circuit pattern of printed board  70  is flied away as shown by an arrow A by applying voltage to the pattern or moving the electrode  30  applied with voltage toward the pattern. 
       7th Embodiment 
       [0062]      FIG. 7  is a view for explanation on the case in which the object of dust removal is a metal box such as the box of a distribution board, the box of a gas stove, the box of a personal computer, the box of a cell phone, the box of a brass instrument or the like. In  FIG. 7  when the dust charged with plus or minus electricity is attached to a metal box  80 , the pulsed voltage is applied with or without contact. As a result the dust charged with plus electricity is flied away by applying plus voltage and the dust charged with minus electricity is flied away by applying minus voltage as shown by an arrow A. 
       8th Embodiment 
       [0063]      FIG. 8  is a view for explanation on the case in which the object of dust removal is an insulator such as plastic.  FIG. 8   a  is a view for explanation on the case in which the electrode applied with voltage is moved toward the plastic from the side opposite to the dust to remove the dust from the plastic. In  FIG. 8   a , when the electrode  30  is plus the dust  12  charged with plus electricity is flied away, and when the electrode  30  is minus the dust  12  charged with minus electricity is flied away.  FIG. 8   b  is a view for explanation on the case in which the electrode applied with voltage is moved toward the plastic from the side the dust is attached to remove the dust from the plastic. In  FIG. 8   b , when the electrode  30  is plus the dust  12  charged with minus electricity is flied away, and when the electrode  30  is minus the dust  12  charged with plus electricity is flied away. In other words, the dust is attracted toward the electrode  30 . 
       9th Embodiment 
       [0064]      FIG. 9  is a view for explanation on the case in which the object of dust removal is a plastic or a glass lens.  FIG. 9   a  shows the case in which the electrode applied with voltage is moved toward the dust from the opposite side the dust is attached to fly the dust away.  FIG. 9   b  shows the case in which the electrode applied with voltage is moved toward the dust from the side the dust is attached to attract the dust. In either cases the dust  12  is flied away from the lens  90 . 
       10th Embodiment 
       [0065]      FIG. 10  is a view for more detailed explanation on the dust remover for removing dust from the balls for use in the game “Pachinko”. In  FIG. 10  the balls  60  enter from the entrance gate of the dust remover as shown by an arrow B and are applied with voltage on an electrode mesh  30  to fly the dust away from the balls  60 . Thereafter the balls are discharged as shown by an arrow C. Since the balls  60  are applied with voltage on the electrode mesh  30 , the balls applied with voltage are isolated and insulated from those balls in the entrance or discharge gates by isolators  108 . While the balls  60  on the electrode mesh  30  are applied with voltage, the balls are blown by an air blower  100  from the underside. Therefore, the dust  12  which is more likely to be removed is easily flied away. Furthermore, the numeral  110  indicates a restriction mesh, the numeral  112  indicates an array of opposed electrodes for aid to dust removal, the numeral  34  indicates grounded electrodes, and a power supply is not shown. Furthermore, although in the embodiment the dust removal for balls used in the game “Pachinko” is explained, the dust remover can be applied similarly to the dust removal for coins used in the game machine. 
         [0066]    At that time, an inner air pressure distribution is controlled so that the removed dust is not flied away outside. Assuming that the quantity of intake air of a fan  102  with filter  104  at the inlet is Vin, the quantity of discharge air of a fan  106  with filter  104  at the outlet is Vout, the quantity of air blow is Vair, and the quantity of air leaked from the inlet and outlet for balls is Vleak, if these quantities are controlled so that the following formula consists, the removed dust does not come outside, the environment is not contaminated, and the outside dust does not enter the dust remover and therefore dust is not attached to the balls  60 . 
         [0000]        V leak= V in+ V air− V out
 
         [0000]      Vleak≧0
 
       11th Embodiment 
       [0067]    Although in the aforementioned embodiments 1 to 10, only an application of voltage is fundamentally used to remove the dust, on and after the 11th embodiments an application of voltage and other means are combined to enhance the effects of dust removal. To begin with, before the 11th embodiment is explained, the dust-return phenomenon will be explained.  FIG. 11  is a view for explanation on the dust-return phenomenon. As shown in  FIG. 11  when the dust repelling electrode  30  is applied with pulsed voltage in a phase I that the applied voltage has the same polarity as that of the electric charge with which the dust is charged, the dust is flied away from the object of dust removal due to repulsive force. In next opposite phase II, the dust returns to the object of dust removal due to attracting force and is attached to the object of dust removal again. As the frequency of pulsed voltage applied to the electrode becomes higher more numerous objects of dust removal can be treated. However, as the frequency is higher, the dust is attracted before the dust is flied away enough and is attached to the object of dust removal again. For this reason, as long as the transfer speed of object of dust removal is limited, the frequency of power supply is limited and therefore handling capacity is limited. 
         [0068]      FIG. 12  is a view showing the dust remover of the 11th embodiment. In  FIG. 12  an ionizer or ion generating device issues ions  14  and  16  (plus and minus ions) toward the circumference of the object of dust removal  10  which is being dust removed by the dust remover. In that case the ionizer having a good balance between plus and minus ions is used. When the voltage of same polarity with that of dust is applied to the dust repelling electrode  30  the dust is flied away. The dust floating in the air turns (out) to be discharged since the electricity with the dust is charged attracts the ions of opposite polarity. Since the dust without charge is not attracted when the voltage of opposite polarity is applied, reattachment of the dust is avoided. Therefore it can be applied to the dust removal of the object which is moved at a low speed. 
       12th Embodiment 
       [0069]      FIG. 13  is a view showing the dust remover of the 12th embodiment,  FIG. 13   a  shows the state that the dust is attached to the object of dust removal, and  FIG. 13   b  shows the state that the dust is removed from the object of dust removal. In  FIG. 13  a dust attracting opposite electrode  34  which is grounded is provided above the dust repelling electrode  30  on the opposite side of the object of dust removal  10 , when the pulsed voltage is applied to the dust repelling electrode under the circumstances of dust attachment as shown in  FIG. 13   a  the dust  12  is flied away from the object of dust removal  10  due to the voltage applied from the dust repelling electrode  30 . Either of the dust charged with plus electricity and the dust charged with minus electricity is attached to the dust attracting electrode  34 . In other words since the dust  12  is removed without return to the object of dust removal  10 , the frequency of the voltage applied to the dust repelling electrode  30  can be made higher, and therefore the moving speed of the object of dust removal can be made lower. 
       13th Embodiment 
       [0070]      FIG. 14  is a view showing the dust remover of the 13th embodiment. In  FIG. 14  a dust attracting opposite electrode  36  such as mesh type or lattice type of electrode is provided instead of the grounded dust attracting opposite electrode  34  used in the 12th embodiment and further a dust suction fan  38  is provided above the electrode  36 . The pulsed voltages of opposite polarities as shown in  FIG. 14  are respectively applied to the dust repelling electrode  30  and the dust attracting electrode  36 . 
         [0071]    Now, when the voltages of opposite polarities are applied to the dust repelling electrode  30  and the dust attracting electrode  36  the dust is removed from the object of dust removal by the dust repelling electrode  30  and simultaneously the dust is attracted by the dust attracting electrode  36 . For this reason since the repelling force and attracting force are applied to the dust at the same time, the dust is likely to be removed. The dust attached on the dust attracting electrode  36  departs from the dust attracting electrode  36  since the voltage applied to the dust attracting electrode  36  is switched over from one polarity to the other polarity. The dust thus departed is collected by the dust suction fan  38 . 
       14th Embodiment 
       [0072]      FIG. 15  is a perspective view showing more detailed examples of electrodes, that is, dust repelling electrode and dust attracting electrode. Although the electrodes (dust repelling electrode and dust attracting electrode) are shown diagrammatically in the previous embodiments. One of any proper shapes can be adopted as this electrode and for example such shapes as shown in  FIG. 15  can be used. The shapes include (a) a needle shape with (its) pointed end (leading end pointed), (b) one dimensional array of needle shape of electrodes, (c) two dimensional array of needle shape of electrodes, (d) a rod electrode one of the edges is used, (e) line or rod-like shape, (f) mesh shape, (g) plate-like shape and (h) ring shape, and the like. 
       15th Embodiment 
       [0073]      FIG. 16  is a view showing three examples of the dust remover provided with a dust suction device according to the 15th embodiment,  FIGS. 16   a  and  16   b  show the examples in which a dust suction vacuum device and a dust attracting electrode are disposed on the same side of the object of dust removal, and  FIG. 16   c  shows the example in which a dust suction vacuum device and a dust repelling electrode are disposed on the opposite side of the object of dust removal. In  FIG. 16  on each example the object of dust removal may be an insulator  40  or a conductor  10 , a dust suction vacuum device  46  is disposed above the object of dust removal  10 / 40 . As an example shown in  FIG. 16   a , the dust attracting electrode  36  fed by a power supply  42  is disposed inside a dust suction vacuum device  46 , as an example shown in  FIG. 16   b  the dust attracting electrode  36  fed by a power supply  42  is disposed on circumferential leading end of the dust suction vacuum device  46 . The dust attracting electrode  36  include various type of shapes such as a point-like one, a ring-like one, or the like. The dust is attracted by electric attracting force generated by the dust attracting electrode  36  and then the floating dust or the dust likely to float is sucked and collected by the vacuum suction device  46 . 
         [0074]    As an example in  FIG. 16   c , the dust is repelled by electric repelling force generated by the dust repelling electrode  30  fed by the power supply  42  opposed at the opposite side of the object of dust removal  10 / 40  against the suction and then the floating dust or the dust likely to float is sucked and collected by the vacuum suction device  46 . At that time although it is preferred that the dust attracting electrode  36  is provided on the side of the vacuum suction device  46  to suck the dust in, the dust attracting electrode  36  may be not provided. The dust attracting opposite electrode  36  is grounded or is applied with the voltage of opposite polarity to that of the dust repelling electrode. If the dust attracting opposite electrode is applied with the voltage of opposite polarity to that of the dust repelling electrode the dust is attracted by stronger force. 
       16th Embodiment 
       [0075]      FIG. 17  is a view showing a dust remover provided with an air blower according to 16th embodiment,  FIG. 17   a  shows the case in which a dust attracting electrode and an air nozzle of air blower are disposed on the same side of the object of dust removal, and  FIG. 17   b  shows the case in which a dust repelling electrode and an air nozzle of air blower are disposed on the opposite side of the object of dust removal. 
         [0076]    As shown in  FIG. 17  an air blower  48  is disposed adjacent the dust attracting electrode to blow the air toward the object of dust removal. The object of dust removal may be either an insulator  10  or a conductor  40 . 
         [0077]    As shown in  FIG. 17   a  the dust attracting electrode  36  attracts the dust and then the floating dust or the dust likely to float is blown out by air blow from the air blower  48 . As shown in  FIG. 17   b  the dust repelling electrode  30  repels the dust  12  and then the floating dust or the dust likely to float is blown out by air blow from the air blower  48 . At that time it is preferred that the dust attracting electrode  36  (may be) is provided on the same side of the air blower although it isn&#39;t necessarily needed. The dust attracting electrode  36  is grounded. Alternatively the voltage of the dust attracting electrode  36  is made to have an opposite polarity to that of the dust repelling electrode  30 . If so, stronger attracting force can be obtained. 
       17th Embodiment 
       [0078]      FIG. 18  is a view showing the dust remover according to 17th embodiment. In  FIG. 18 , on the upper stream side of the object of dust removal  10 / 40 , dust repelling electrode  30  such as a mesh-like one, a dust blowing-out fan  120  with filter  122 , and air blow tube  130  through which air is supplied to blow out the dust are provided, and on the downstream side of the object of dust removal, the dust attracting electrode  36  such as a mesh-like one and a dust suction fan  124  with a filter  126  are provided. As shown in  FIG. 18  the dust attracting electrode  36  is grounded. Alternatively the voltage Vi of the dust attracting electrode  36  is made to have an opposite polarity to the voltage V 0  of the dust repelling electrode  30 . If so, stronger attracting force can be obtained. 
       18th Embodiment 
       [0079]      FIG. 19  is a view showing the embodiment in which the object of dust removal is a car body,  FIG. 19   a  shows the example of car body corresponding to the embodiment shown in  FIG. 16   c  and  FIG. 19   b  shows the example of car body corresponding to the embodiment shown in  FIG. 17   b . In  FIG. 19   a  the dust repelling electrode  30  is directly connected to the car body  50  or is made to approach to the car body from the opposite side of the dust attached surface without contact to repel the dust. Furthermore the dust attracting electrode  36  is provided at the vacuum suction inlet of the dust suction vacuum device  46  to suck the dust in. The floating dust or the dust likely to float is collected by vacuum suction. The dust attracting electrode  36  is grounded. Alternatively the voltage of the dust attracting electrode  36  is made to have an opposite polarity to the voltage of the dust repelling electrode  30 . If so, stronger attracting force can be obtained. 
         [0080]    In  FIG. 19   b  the dust repelling electrode  30  is directly connected to the car body  50  or is made to approach to the car body from the opposite side of the dust attached surface without contact to repel the dust. Furthermore the air nozzle of air blower is provided adjacent the dust attracting electrode  36  to blow out the dust  12 . The floating dust or the dust likely to float is blowed out by the air blow from air blower. The dust attracting electrode  36  is grounded. Alternatively the voltage of the dust attracting electrode  36  is made to have an opposite polarity to the voltage of the dust repelling electrode  30 . If so, stronger attracting force can be obtained. 
         [0081]    It is understood that many modifications and variations may be devised given the above description of the principles of the invention. It is intended that all such modifications and variations be considered as within the spirit and scope of this invention, as it is defined in the following claims.