JPH07101639B2 - Static eliminator and static elimination method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a static eliminator for neutralizing a charged substance such as resin or rubber charged by static electricity, and more specifically, to a discharge electrode for corona discharge. The present invention also relates to a static eliminator that neutralizes a charged object by using ions generated by corona discharge.

[Prior Art] In this type of static eliminator, conventionally known ones are, for example, those shown in FIGS. 18A, 18B, and 19.

FIG. 18A and FIG. 18B are views showing an alternating-current application type static eliminator which is an example of a conventional static eliminator. FIG. 18A is a cross sectional view thereof and FIG. 18B is a front view thereof. 18A and 18B
Referring to the drawing, a body 1 of the static eliminator is supported by a support 2, and a ground electrode 4 connected to the ground is attached to a lower portion of the support 2. In the figure, 5 is a high-voltage core wire, and a voltage of, for example, about 7 to 9 KV is applied to this high-voltage core wire 5. As shown in FIG. 18A, an insulating layer 7 is formed on the outer periphery of the high-voltage core wire 5, and the insulating layer 7 capacitively couples the high-voltage core wire 5 with a plurality of capacitive coupling bodies 8 made of a conductive material. ing. The capacitive coupling body 8 has a ring shape, and one or a plurality of discharge electrodes 3 project downward from the capacitive coupling body 8. In the figure, 6 is an insulator made of a plastic film or the like. The body 1 is made of an insulating material.

The circuit diagram of the static eliminator shown in FIGS. 18A and 18B is shown in FIG.
Shown in the figure. In the figure, 9 is a transformer (REAK AGE transformer) provided for stability during electric shock. It converts the voltage of 100V, 200V to about 7 to 9KV, and the current of about 3mA even if the high voltage wire 5 side is short-circuited. It is configured to flow only. The voltage of about 7 to 9 kv is applied to the high voltage core wire 5, and the discharge electrode 3 is capacitively coupled to the high voltage core wire 5.
AC voltage is generated at.

20A and 20B are operation explanatory views for explaining the operation of the conventional static eliminator shown in FIGS. 18A, 18B, and 19. In the figure, 10 is an AC power source, and the transformer 9 shown in FIG. 19 is omitted. In the case where a voltage is generated on the discharge electrode 3 when the charged object 6 charged in the above is discharged, the description will be given first with reference to FIG. 20A. When a high voltage is generated in the discharge electrode 3, corona discharge occurs, and a large number of ions due to ionization are generated in the vicinity of the discharge electrode 3. In the corona discharge, a large number of polar ions of both ions (anions) and ions (cations) are generated, and when the charged material 6 is charged as shown in the figure, the ions are attracted to the charged material 6 side. . On the other hand, some of the ions are attracted to the discharge electrode 3 or the ground electrode 4 and flow to the ground, and further, some of them are scattered in the air and the number thereof is reduced. The charged object is neutralized by the ions attracted to the charged object 6. The larger the potential difference between the discharge electrode 3 and the charged object 6, the faster the moving speed of the ion to the charged object 6 side. Along with this, ion wind is generated, and ions that are unnecessary for static elimination are also swept away by the ion wind and move to the charged object 6 side. As a result, there is an inconvenience that the ions are recombined with each other during the movement to the charged object 6 and the number of ions necessary for the charge removal is also reduced during the movement.

Next, the case where a negative voltage is generated in the discharge electrode 3 will be described based on FIG. 20B. When a negative voltage is generated on the discharge electrode 3, the potential difference between the discharge electrode 3 and the charged object 6 is reduced, so that the ions generated by the corona discharge do not move to the charged object 6 side and the charge is removed. Will not be performed. Moreover, the ions effective for static elimination are easily attracted to the discharge electrode 3, and the ions are recombined in the air to reduce the number of ions,
Due to the reduction of the ions necessary for the static elimination, the static elimination efficiency deteriorates.

FIG. 21 is an operation explanatory view showing an operation of a DC voltage application type static eliminator which is an example of a conventional static eliminator.

In the DC voltage application type static eliminator, the DC voltage from the DC power supply 11 is applied to the discharge electrode 3. Corona discharge is generated by the voltage applied to the discharge electrode 3, and a large number of ions and ions are generated. As shown in the figure, when the charged object 6 is negatively charged, among the ions generated by the corona discharge, the ions are attracted to the charged object 6 side. On the other hand, some of the ions are attracted to the discharge electrode 3 and the ground electrode 4 to flow to the ground side, and some of the ions are scattered in the air. The charged object 6 is neutralized by the ions attracted to the charged object 6 side, but as the ions move to the charged object 6 side, an ion wind is generated in the same manner as described above, and the ion wind also causes the ion. The ions are washed away to the side of the charged object 6, and the ions are recombined with each other during the movement to the charged object 6, so that the ions useful for static elimination are reduced.

In addition, in this DC voltage application type static eliminator, the charged object 6 which has moved to zero potential due to the electrostatic induction by the action of the positive voltage of the discharge electrode 3 after the moving charged object 6 is completely neutralized. A charge is generated on the electrode-side surface of 6, and a phenomenon occurs in which the charges are separated and deposited on the opposite surface. As a result, the charge on the electrode side surface is neutralized by the ions sent from the electrode, and only the charge on the opposite surface remains, so-called reverse charging of the charged object occurs.

As described above, in the conventional static eliminator, since the unnecessary ions of the same polarity as the charged substance among the ions generated by the corona discharge are insufficiently removed, the unnecessary ions remaining without being removed Ions and useful ions, which have the opposite polarity to the charged substances required for static elimination, recombine on the way to the charged substances side, and the useful ions disappear without reaching the charged substances. Inconvenience occurs.
As a result, as the distance between the static eliminator and the charged object becomes longer, many useful ions disappear due to recombination during the movement of the ions to the charged object, and most of the useful ions are transferred to the charged object. There was the inconvenience that it did not reach the target and almost no static elimination effect occurred. For this reason, the conventional static eliminator is limited to those that can remove static electricity by bringing the static eliminator close to the static eliminator, such as a plate-shaped or sheet-shaped static eliminator. It has a drawback that charged objects, such as parts, which are highly uneven and cannot be brought close to the static eliminator, cannot eliminate static electricity.

As a method for solving such a defect, there is a method described in Japanese Patent Publication No. 38-10208. In this conventional static eliminator, for example, an absorptive electrode capable of electrically absorbing generated ions is provided in front of the ground electrode 4 shown in FIGS. 18A and 18B, and the vicinity of the discharge electrode is provided by corona discharge. The voltage for electrically absorbing one of the positive ions and the negative ions generated in the above was applied to the absorptive electrode.

[Problems to be Solved by the Invention] However, in the conventional static eliminator configured as described above, it is necessary to perform a mounting operation for additionally providing an absorbable electrode on the front side (charged object side) of the ground electrode. With
There is a drawback in that the structure in which the absorbable electrode is provided becomes complicated and the cost becomes high. Further, since the absorptive electrode is located further to the front side than the ground electrode, there is a possibility that the charged object may collide with the ground electrode especially when the charged object is three-dimensional and has unevenness.

Further, in the conventional AC voltage application type static eliminator, in the half cycle in which the discharge electrode has the same polarity as the charged object in the cycle of the applied AC voltage, there is a completely useless state that is not effectively used for static elimination. However, there is a drawback that the static elimination effect is reduced.

The present invention has been conceived in view of such a situation, and an object thereof is to cause cations and anions generated by corona discharge to move to a charged object side without causing complication of the structure. It is an object of the present invention to provide a static eliminator capable of preventing as much as possible the inconvenience of recombination to reduce the number of polar ions effective for static elimination.

[Means for Solving the Problems] The present invention according to claim 1 has a first discharge electrode and a second discharge electrode for corona discharge, and utilizes ions generated by corona discharge. A static eliminator for neutralizing a charged object, wherein a first voltage is applied to the first discharge electrode,
A second voltage having a potential difference with respect to the first voltage and having a polarity opposite to that of ions that are unnecessary and need to be removed among the generated ions is applied to the second discharge electrode. The second discharge electrode is also used as an absorptive electrode for electrically absorbing one of positive and negative ions generated by the corona discharge. Is characterized by.

In addition to the configuration of the invention described in claim 1, the invention described in claim 2 further includes an insulator for preventing electric shock due to the absorbable electrode.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the voltage applying unit applies a direct current voltage or a pulsating current voltage to the absorptive electrode to be absorbed. DC / pulsating voltage applying means for maintaining the polarity of the ions to be formed, further comprising voltage polarity switching means for switching the polarity of the voltage applied by the DC / pulsating voltage applying means, and the switching adjustment of the voltage polarity switching means. By doing so, it is possible to keep the polarity and proportion of the ions formed effectively and to keep them in the required amount.

The present invention according to claim 4 is a static eliminator which has a discharge electrode for corona discharge and neutralizes a charged object by utilizing ions generated by corona discharge, wherein the generated ions are electrically absorbed. A possible absorbable electrode, and a voltage for electrically absorbing ions of one polarity of cations and anions generated in the vicinity of the discharge electrode by the corona discharge is applied to the absorbable electrode. A voltage applying unit that changes the completion ratio of the positive ions and the negative ions, the voltage applying unit applying a voltage of a first frequency to the absorbable electrode, and the discharge different from the absorbable electrode. It is characterized by including alternating voltage applying means for applying a voltage of a second frequency different from the first frequency to the electrodes.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect to the fourth aspect, the voltage applying unit applies the absorbing electrode to the absorptive electrode on the basis of data relating to a potential associated with charging of a charged object. An automatic voltage control means for automatically controlling the applied voltage is included.

The present invention according to claim 6 is a static eliminator which has a discharge electrode for corona discharge and neutralizes a charged object by utilizing ions generated by corona discharge, wherein the generated ions are electrically absorbed. A charge removing unit having an absorbable electrode and the discharge electrode capable of irradiating a charged object with generated ions, and having one polarity of cations and anions generated near the discharge electrode by the corona discharge. A voltage applying unit that applies a voltage for electrically absorbing ions to the absorptive electrode to change the completion ratio of the cations and anions, and a relative unit that relatively moves the charged object and the charge eliminating unit. A moving unit, an input unit for inputting data relating to a charging condition in the relative movement direction of the charged object, and an absorbable electrode of the static eliminating unit based on the data input from the input unit. It controls the voltage to be applied,
Controlling the relative movement means to control the relative movement speed of the static elimination unit and the charged material, and controlling both the amount of unwanted ions absorbed by the absorptive electrode and the relative movement speed control. And a mold control means.

According to a seventh aspect of the present invention, in addition to the configuration of the first aspect of the invention, a voltage is applied to the absorptive electrode to absorb an ion having one polarity of a cation and an anion. And a second electrode to which a voltage for absorbing ions having a polarity opposite to the polarity of the ions absorbed by the first electrode is applied, the first electrode Useful ion separation irradiation for irradiating a charged object while separating the useful ions after being absorbed and the useful ions after being absorbed by the second electrode from crossing each other and recombining with each other. Means are further included.

According to the present invention of claim 8, in addition to the structure of the invention of claim 7, the useful ion separation irradiation means includes means for irradiating the both useful ions in directions away from each other.

According to a ninth aspect of the present invention, in addition to the structure of the seventh aspect, the useful ion separating / irradiating means includes a partition member that separates the both useful ions.

According to a tenth aspect of the present invention, in addition to the structure of the seventh aspect, the useful ion separating / irradiating means includes an air curtain blower port for forming an air curtain separating the two useful ions. .

According to the present invention of claim 11, in addition to the configuration of the invention of claims 1 to 10, the discharge electrode and the absorptive electrode are provided in an insulative body having a generated ion ejection port. It is housed, a predetermined internal pressure is applied to the container, and the generated ions are ejected from the ion ejecting port.

According to a twelfth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the discharge electrode and the absorptive electrode are provided in a body having a nozzle for blowing air. The generated ions are blown out from the nozzle together with the air.

The present invention according to claim 13 provides a discharge electrode for corona discharge, and an absorptive electrode to which a voltage for absorbing one polarity ion of ions generated by corona discharge by the discharge electrode is applied. A first step of removing a charged object by a first static eliminator having a discharge electrode for corona discharge, and an absorptive electrode capable of electrically absorbing ions generated by corona discharge by the discharge electrode. And a second step of neutralizing a charged object by a second static eliminator having an electrode connected to the ground.

[Operation] According to the present invention described in claim 1, the first and second corona discharges are provided.
A second discharge electrode is provided, and the first voltage is applied to the first discharge electrode by the function of the voltage applying means, and the first voltage is applied to the first discharge electrode.
Since a second voltage having a potential difference with respect to the above voltage and having a polarity opposite to that of ions that are unnecessary and need to be removed among the generated ions can be applied to the second discharge electrode. In addition, positive and negative ions are generated by the first and second discharge electrodes, and the ions to be removed out of these two ions are absorbed by the second discharge electrode. The second discharge electrode is also configured as an absorptive electrode for electrically absorbing one of positive and negative ions generated by corona discharge.

According to the present invention described in claim 2, in addition to the function of the invention described in claim 1, since the worker includes an insulator for preventing electric shock due to the absorbable electrode, the worker performing the static elimination work. It is possible to prevent electric shock when touching the absorbable electrode unexpectedly and to prevent sparks from occurring as much as possible.

According to the present invention described in claim 3, in addition to the function of the invention described in claim 1 or 2, the voltage / polarity switching means is switched and adjusted to be applied by the DC / pulsating current voltage applying means. The polarity of the applied voltage is switched and adjusted, and the polarity and proportion of the ions thus produced can be effectively maintained and maintained at a necessary amount.

According to the fourth aspect of the present invention, by the function of the voltage applying means, an ion having one polarity of cations and anions generated near the discharge electrode by the corona discharge is electrically absorbed. A voltage is applied to the absorptive electrode and the resulting proportion of cations and anions changes. Then, due to the function of the alternating voltage applying means, the voltage of the first frequency is applied to the absorbable electrode, and the voltage of the second frequency different from the first frequency is applied to the discharge electrode different from the absorbable electrode. Is applied.

As a result, the first state in which a positive voltage is generated in both the discharge electrode and the absorbable electrode, and the second state in which a negative voltage is generated in the discharge electrode and a positive voltage is generated in the absorbable electrode
State, a third state in which a positive voltage is generated in the discharge electrode and a negative voltage is generated in the absorbable electrode, and a fourth state in which a negative voltage is generated in both the discharge electrode and the absorbable electrode. And the state of the static eliminator changes.

Assuming that the charged object is negatively charged, the charge removal operation will be described from the second state to the fourth state.
First, in the first state, a large number of positive ions and negative ions are generated at the discharge electrode. Negative ions are attracted and absorbed by the absorptive electrode to which a positive voltage is applied, and as a result, most of the residual ions become positive ions, and the positive ions become effective ions that are effective in removing the charge of the charged object. The positive ions are attracted toward the negatively charged charged object, and the charged object is discharged. In other words, the positively applied absorptive electrode absorbs and removes the negative ions that are not needed for static elimination, so that the positive ions and the negative ions that are generated at the same time are recombined while the ions move to the charged object. It is prevented as much as possible.

Next, in the second state, since the discharge electrode and the absorptive electrode have different polarities, the potential difference between the two electrodes becomes very large, and a large amount of ions are generated.
Negative ions of the generated large amount of ions are attracted to the absorbable electrode and reduced. Moreover, since the discharge electrode and the charged material both have a negative potential, the potential difference between them is low, and the generated ions are not attracted to the charged material side. As a result, negative ions are sufficiently absorbed by the absorbable electrode, and almost only positive ions remain. In other words, during the period when a negative voltage is generated at the discharge electrode and the absorbable electrode is positively applied, only a large amount of positive ions that are effective in removing the charge of the charged object are generated, and the discharge electrode has a positive potential. When switched to, the positive ions are attracted toward the negatively charged object all at once, which enables efficient and long-distance charge removal.

Next, in the third state, among the generated ions, positive ions are attracted to the absorbable electrode, and mainly negative ions remain. Then, the negative ions can move toward the charged object side based on the potential difference between the discharge electrode and the negatively charged object. However, if there is a part where the negatively charged object is positively charged, The part is discharged.

Next, in the fourth state, positive ions in the generated ions are attracted to the absorbable electrode, and mainly negative ions remain. In particular, since both the discharge electrode and the charged object have a negative potential, there is no large potential difference between the two, and it is difficult for negative ions to move to the charged object side. As a result, positive ions are sufficiently attracted and absorbed by the absorbable electrode, and almost only negative ions remain.
Therefore, there is no static elimination effect. Next, when the polarity of the discharge electrode is switched to positive, a large amount of ions are generated because the potential difference with the absorbable electrode is very large, but because the absorbable electrode is negative and the remaining negative ions. The positive ions necessary for seldom reach the negatively charged object. However, a part of the charged object that is positively charged is eliminated. It should be noted that when the charged object is positively charged, the operation is the opposite of the above description, but similarly, long-distance charge removal can be performed with good efficiency.

According to the present invention described in claim 5, in addition to the operation of the invention described in any one of claims 1 to 4, based on the data on the potential associated with the charging of the charged object by the operation of the voltage automatic control means. The voltage applied to the absorbable electrode is well controlled, charge removal can be performed according to the charged state of the charged object, and fine charge removal can be performed in consideration of the charged state of the charged object.

According to the present invention as set forth in claim 6, there is provided a static eliminator having a discharge electrode for corona discharge and an absorptive electrode capable of electrically absorbing generated ions. The charged object is irradiated. By the function of the voltage applying means, a voltage for electrically absorbing ions of one polarity of cations and anions generated in the vicinity of the discharge electrode by corona discharge is applied to the absorptive electrode to generate positive ions. The rate of completion with anions changes. Due to the function of the relative movement means, the object to be eliminated and the electricity eliminating section relatively move. From the input unit, data regarding the charging status of the static elimination object in the relative movement direction is input.
By the operation of the combined control means, the voltage applied to the absorptive electrode of the static elimination section is controlled based on the data input from the input section, and the relative moving speed of the static elimination section and the charged object is controlled. By using both the control of the amount of unwanted ions absorbed by the absorptive electrode and the control of the relative moving speed, the charged object is discharged without excess or deficiency.

According to the present invention described in claim 7, in addition to the action of the invention described in claim 1, the first electrode absorbs ions of one polarity, and the second electrode causes the first electrode to Ions having a polarity opposite to that of the absorbing ions are absorbed.
Further, the useful ions after being absorbed by the first electrode and the useful ions after being absorbed by the second electrode are prevented from crossing each other and recombining by the action of the useful ion separating / irradiating means. The useful ions are irradiated on the charged object while being separated from each other. That is, since the polarities of the ions to be absorbed are different between the first electrode and the second electrode, one of the first electrode and the second electrode is mainly a cation. Is charged to the charged object, and the anion is mainly applied to the charged object from the other electrode, so that even if the charged object is partially positively or negatively charged, the charge can be satisfactorily removed. Moreover, since the useful ions mainly composed of cations and the useful ions mainly composed of anions are irradiated to the charged object while being irradiated to the charged object, both of the useful ions intersect and recombine on the way. Therefore, it is possible to prevent the disappearance of the ions due to the recombination and prevent the deterioration of the static elimination efficiency as much as possible.

According to the present invention described in claim 8, in addition to the action of the invention described in claim 7, since the both useful ions are irradiated in a direction away from each other, recombination of the both useful ions can be easily performed. And good prevention is possible.

According to the present invention described in claim 9, in addition to the effect of the invention described in claim 7, since the charged object is irradiated with the both useful ions while being separated by the partition member, the recycle of both useful ions is performed. The partition member can surely prevent the coupling.

According to the present invention described in claim 10, in addition to the function of the invention described in claim 7, since both useful ions are separated from each other by an air curtain and recombination is prevented, for example, a partition member is used. When the use of both useful ions is prevented from being recombined, there is no inconvenience that the partition member collides with the charged material and interferes with the static elimination work.

According to the present invention described in claim 11, in addition to the action of the invention described in any one of claims 1 to 10, a predetermined internal pressure is applied to the body, which causes the internal pressure. As a result, air is blown out from the ion outlet, and the inconvenience that sparks and the like generated therein enter the body through the ion outlet and explode the body is unlikely to occur.

According to the present invention described in claim 12, in addition to the effect of the invention described in any one of claims 1 to 10, since the generated ions are blown out together with the air from the nozzle, the generated ions are farther away. It is easy to reach, and it is easy to remove electricity from a long distance.

According to the present invention as set forth in claim 13, since the absorptive electrode of the first static eliminator electrically absorbs ions of one polarity among the generated ions, the ions of one polarity are reduced. , The ratio of cations and anions is not about 1: 1, and the generated bipolar ions are not recombined and disappear during the transfer to the charged object side, so that they are efficient and long distance. Can be removed. On the other hand, in the second static eliminator, since the absorptive electrode is connected to the ground and the generated ions are absorbed by the electrode, the second static eliminator does not exhibit a very strong static erasing action. Then, in the case where the charged object is mainly charged to one polarity and only slightly charged to the other polarity opposite to the one polarity, the main charge is charged to the first polarity. It is possible to satisfactorily discharge the charged material by removing the charge with the charge removing device and removing the partial charge on the other side with the second charge removing device.

Embodiments of the Invention Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1A and 1B show an example of a static eliminator according to the present invention, which is an AC voltage applying static eliminator, and FIG. 1A is a cross-sectional view.
FIG. 1B is a front view.

The container 1 of the static eliminator is supported by a support 2, and an absorption electrode 12 (also serving as one discharge electrode) is attached to a lower portion of the support 2. This absorbing electrode
A high voltage is applied to 12 through the high voltage electric wire 5b. 5a in the figure
Is a high-voltage core wire, an insulating layer 7 is formed on the outer circumference of the high-voltage core wire 5a, and a capacitive coupling body 8 made of a conductive material is provided on the outer circumference of the insulating layer 7. That is, the high-voltage core wire 5a and the capacitive coupling body 8 are capacitively coupled via the insulating layer 7. As a result, an AC high voltage is applied to the high voltage core wire 5a, so that an AC high voltage is also generated in the capacitive coupling body 8, and the needle-shaped discharge electrode (hereinafter simply referred to as the discharge electrode) protruding downward from the capacitive coupling body 8 is generated. AC) high voltage occurs in (3). The container 1 is made of an insulating material and prevents the high voltage generated in the capacitive coupling body 8 from leaking to the outside. Furthermore, the outside of the absorbing electrode 12 is an insulator 13
The absorption electrode 12
It is possible to prevent electric shock from touching and to prevent generation of sparks. When a high voltage is generated in the discharge electrode 3, corona discharge occurs and a large number of cations and anions are generated in the vicinity of the discharge electrode 3. The ions enable the charge 6 to be removed.

FIG. 2 is a circuit diagram of the AC voltage application type static eliminator shown in FIGS. 1A and 1B.

When AC is supplied from the AC power supply 10 to the static eliminator, the transformer (REAKAGE transformer) 9a transforms the commercial power supply voltage (for example, 100 V) into 7 to 9 KV. As a result, even if there is a short circuit on the secondary coil side, only a current of about 3 mA will flow and the static eliminator will not be electrocuted. The voltage transformed by the transformer 9a is applied to the high voltage core wire 5a. As described above, a high voltage is generated in the capacitive coupling pair 8 that is capacitively coupled to the high voltage core wire 5a, and as a result, a similar high voltage is also generated in the discharge electrode 3. In the figure, 1 is a body.

The commercial power supply voltage applied by the AC power supply 10 (for example,
The voltage of 100 V) is frequency-converted by the frequency conversion circuit 19 and converted into a frequency lower than that of the AC power supply 10, for example, about 1/4. The converted alternating current is transformed by the transformer (REAKAGE transformer) 9b to, for example, about 0.1 to 5 KV, and the transformed voltage is applied to the absorption electrode 12. Reference numeral 13 is an insulator provided outside the absorbing electrode 12 for preventing electric shock.
As the frequency conversion circuit 19, for example, a well-known one such as one using a saturation transformer or rectifier, one using a vacuum tube, a transistor, or a thyristor is used.

FIG. 3 is an operation explanatory view showing an operation of the AC high voltage application type static eliminator shown in FIGS. 1A, 1B and 2. FIG. 4A and FIG. 4B are graphs showing a voltage V ₁ generated at the discharge electrode 3 and a voltage V ₂ applied at the absorption electrode 12 in the AC high voltage application type static eliminator.

In FIG. 3, illustration of the transformers 9a and 9b shown in FIG. 2 is omitted. An AC high voltage V ₁ of, for example, about 60 cycles is applied to the high voltage core wire 5 from the AC power supply 10, and a voltage of the same frequency is generated in the capacitive coupling body 8 and the discharge electrode 3 which are capacitively coupled to the high voltage core wire 5. . On the other hand, absorption electrode
The voltage V ₂ frequency-converted by the frequency conversion circuit 19 is applied to 12. The relationship between this voltage V ₁ and voltage V ₂ is
As shown in FIGS. 4A and 4B, when V ₁ is represented by asinωt, the voltage V ₂ is Is expressed as Here, k is an integer of 2 or more. In the case of this embodiment, a case of k = 4 is shown.

In FIG. 3, the movement of the generated ions when the voltage is applied to the discharge electrode 3 and the voltage is applied to the absorbing electrode 12 to charge the charged material 6 will be described. With the corona discharge due to the high voltage generated in the discharge electrode 3, a large number of ions and ions are generated in the vicinity of the discharge electrode 3. Some of the ions are absorbed by the discharge electrode 3, and further absorbed and absorbed by the absorption electrode 12 to which a voltage is applied. As a result, most of the residual ions become ions and the ions are effective in removing the charge from the charged object 6. It becomes a useful ion. The ions are attracted toward the charged object 6 that is charged, and the charged object 6 is discharged. That is,
Since the ions that are unnecessary for static elimination are absorbed by the absorption electrode 12 applied to, and are almost absorbed,
It is almost prevented that the ions and the ions generated at the same time are recombined and reduced during the movement of the ions to the charged object 6, and the charged object 6 is far away from the neutralization device. become.

Next, a case where a voltage is generated in the discharge electrode 3 and a voltage is applied to the absorbing electrode 12 to charge the charged material 6 will be described. Since the discharge electrode 3 is a voltage and the absorption electrode 12 is a voltage, the potential difference between the two electrodes is very large, and a large amount of ions are generated. Ions of the generated large amount of ions are attracted to the absorption electrode 12 and reduced. Moreover, since the discharge electrode 3 and the charged material 6 have the same potential, the potential difference between them is low, and the generated ions are not attracted to the charged material 6 side so much. As a result, the absorption electrode 12 sufficiently absorbs the ions, and almost all the ions remain. That is, during the period in which the negative voltage is generated in the discharge electrode 3 and the absorbing electrode 12 is positively applied, only a large amount of ions effective for the charge removal of the charged object 6 are generated, and the discharge electrode 3 When is switched to a positive potential, the ions are attracted toward the charged object 6 at a time, which enables efficient and long-distance charge removal.

Next, a positive voltage is generated in the discharge electrode 3 and the absorption electrode 12
The operation during the period when the negative voltage is applied to is explained. During this period, among the generated ions, the ions are absorbed by the absorption electrode 12, and a large amount of the ions mainly remain. Then, based on the potential difference between the discharge electrode 3 and the charged object 6, the ions are charged to the charged object 6.
Although it can move toward the side, if there is a part where the charged object 6 is positively charged, that part is discharged.

Next, the operation during the period when the negative voltage is generated in the discharge electrode 3 and the negative voltage is applied to the absorbing electrode 12 will be described. During this period, the ions in the generated ions are attracted to the absorption electrode 12, and the ions mainly remain. In particular, since both the discharge electrode 3 and the charged material 6 have a negative potential, there is no large potential difference between them, and the ions do not move to the charged material 6 side. As a result, the absorbing electrode 12 sufficiently absorbs and absorbs the ions, and almost all the ions remain. Therefore, there is no static elimination effect. Next, when the polarity of the discharge electrode 3 is switched to, a large amount of ions are generated because the potential difference between the discharge electrode 3 and the absorption electrode 12 becomes very large. Most of the ions necessary for reaching the charged object 6 do not reach the charged object 6.
However, the part of the charged object 6 that is partially charged is discharged.

Next, when the charged object 6 is charged to the opposite of the above description, efficient long-distance charge removal is possible.

As described above, by applying the alternating voltage V ₂ to the absorbing electrode 12, even when the charged object is partially positively or negatively charged, the partial positively or negatively charged portion is far away. It is possible to satisfactorily eliminate static electricity. In the static eliminator shown in FIG. 3, the voltage applied to the absorption electrode 12 In, it is necessary that k ≧ 2. However, when the voltage applied to the absorbing electrode 12 is switched at a high speed of 0.03 seconds or more, the charge removal effect is reduced. The reason for this is that the ions remaining after the static elimination in the previous half cycle and the ions remaining after the static elimination in the current half cycle are recombined together.

5A to 5D are a circuit diagram and an operation explanatory view showing another example of the static eliminator according to the present invention.

In the static eliminator shown in FIG. 5A, the voltage from the AC power supply 10 is applied to the high-voltage core wire 5 and capacitively coupled to the high-voltage core wire 5, and a large AC voltage is applied to the discharge electrodes 3. Voltage is generated. An absorption electrode 12 for absorbing ions generated due to corona discharge accompanying the high AC voltage and ions having one polarity of ions is provided. In the figure, 11b and 11c are DC power supplies, and a positive voltage from the DC power supply 11b is applied to the absorption electrode 12 by switching the switch 34, which is an example of voltage polarity switching means, to the arrow a side. On the contrary, by switching the switch 34 to the arrow b side, the negative voltage from the DC power source 11c is absorbed by the absorbing electrode 12.
Applied to.

If charged object 6 is negatively charged, switch
Switch 34 to the arrow a side. Then, as shown in FIG. 5B, since a positive voltage is applied to the absorbing electrode 12, the discharge electrode 3
Of the ions generated in the vicinity of the
Is absorbed and disappears, and mainly ions remain. The ions move to the side of the charged object 6 when a positive voltage is generated in the discharge electrode 3, and the charged object 6 that is negatively charged is discharged. On the other hand, the discharge electrode 3
When a negative voltage is generated in the discharge electrode 3, the discharge electrode 3 and the charged material 6 both have a negative potential, and a large potential difference does not occur between the two, so that ions are mostly left in the vicinity of the discharge electrode 3 and the charged material 6 is too much. Do not move to the side. As a result, ions are sufficiently absorbed and neutralized by the absorbing electrode 12, and almost all the ions remain.
Then, when the discharge electrode 3 is switched to the positive voltage, the ions move to the charged object 6 side at the same time, and the charged object 6 moves.
It is possible to efficiently remove static electricity over a long distance.

Next, when the charged object 6 is charged to a positive potential,
The switch 34 is switched to the arrow b side to apply a negative voltage to the absorbing electrode 12. Then, the absorption electrode 12 absorbs the ions, and the ions mainly remain. The residual ions composed of the ions move to the side of the charged object 6 that is positively charged, and the charged object 6 is discharged. Also in this case
Similar to the description in the case of the drawing, the maximum charge eliminating effect is exhibited when the voltage is applied to the discharge electrode 3 when the electric charge 6 is charged and the voltage is applied to the absorption electrode 12.

FIG. 5C is a circuit diagram of a static eliminator of the type in which a pulsating flow is applied to the absorbing electrode. The difference from Fig. 5A is that the AC high-voltage power supply
A high voltage alternating current from 10 is rectified through a half-wave rectifier circuit 78, then smoothed through a voltage stabilizer circuit 77, and a pulsating voltage as shown in FIG. 5D is applied to the absorbing electrode 12. Is. FIG. 5D is an alternating current and absorption electrode generated in the discharge electrode 3.
FIG. 5 is a diagram showing a graph showing a relationship with a pulsating flow applied to 12.

With reference to FIG. 5D, description will be made on the case of removing the charge of a negatively charged charged object. First, in the half cycle in which the positive voltage is generated in the discharge electrode 3, the potential difference between the discharge electrode 3 and the negatively charged charged object is large, so that the generated ions are accelerated toward the charged object and the charged object Is discharged. On the other hand, in the next half cycle in which the polarity of the voltage generated in the discharge electrode 3 is switched and the negative voltage is generated, the positive voltage is applied to the absorption electrode 12 as shown in the figure, Due to the large potential difference between the absorption electrode 12 and the discharge electrode 3, a large amount of ions are generated. Then, in the next half cycle in which the polarity of the voltage generated in the discharge electrode 3 is further switched and a positive voltage is generated, the potential difference between the discharge electrode 3 and the charged object 6 becomes large. , A large amount of generated ions generated in the last half cycle are accelerated all at once toward the charged object side, and the charged object is efficiently discharged, so that long-distance charge removal is possible. In addition, 5A
Although the illustration of the transformer as shown in FIG. 2 is omitted in the drawings and FIG. 5C, the transformer is actually interposed between the AC power supply 10 and the high voltage core wire 5.

FIG. 6 is a circuit diagram showing still another example of the static eliminator according to the present invention. The static eliminator in FIG. 6 is different from the static eliminator shown in FIG. 5 in that instead of applying the AC high voltage to the high voltage core wire 5 by the AC power source, the DC high voltage by the DC high voltage power sources 11a and 11a ′ is changed. This is a point applied to the high voltage core wire 5. When the charged object 6 is negatively charged, the switch 35 is switched to the arrow a side to apply the positive voltage from the DC high voltage power supply 11a to the high voltage core wire 5. And
The switch 34 is switched to the arrow a side to apply a positive voltage from the DC power supply 11b to the absorbing electrode 12. Then, among the ions generated near the discharge electrode 3, the ions are absorbed.
12 is absorbed and disappears, and mainly ions remain, and the ions are accelerated due to the potential difference between the discharge electrode 3 and the charged object 6 and move to the charged object 6 side,
The negatively charged charged material 6 is efficiently discharged to a long distance. On the other hand, when the charged object 6 is positively charged, the switch 35 is switched to the arrow b side to apply a negative voltage to the high voltage core wire 5 and the discharge electrode 3. Further, the switch 34 is switched to the arrow b side to apply the negative voltage from the DC power supply 11c to the neutralizing electrode 12. Then, among the ions generated in the vicinity of the discharge electrode 3, the ions are absorbed by the absorption electrode 12 and disappeared, and the ions mainly remain. The ions are accelerated due to the potential difference between the discharge electrode 3 and the charged object 6 and move to the charged object 6 side, and the positively charged charged object 6 is efficiently discharged to a long distance.

7A to 7C show another embodiment of the static eliminator according to the present invention. FIG. 7A is a transverse sectional view, FIG. 7B is a partially cutaway perspective view, and FIG. 7C is a circuit diagram.

The inside of the body 1 is divided into two by a partition wall 33,
A capacitive coupling body 8 having discharge electrodes 3a and 3b protruding is provided in each of the two divided bodies. High-voltage core wires 5a and 5b are provided in these capacitive coupling bodies 8, and the discharge electrodes 3a and 3b are capacitively coupled to the high-voltage core wires 5a and 5b. Ion projecting portions 14a and 14b are formed in the lower part of each part of the body 1 which is divided into two by the partition wall 33. Absorption electrodes 12a and 12b for absorbing the generated ions are provided on both sides of the ion ejection portions 14a and 14b. Absorption electrode among the generated ions generated by the discharge electrode 3a
The remaining residual ions absorbed by 12a are the ion ejection part 1
It projects from 4a in the lower left direction in Fig. 7A. Meanwhile, the discharge electrode
Of the generated ions generated by 3b, the remaining residual ions absorbed by the absorbing electrode 12b are ejected from the ion ejecting portion 14b in the lower right direction in FIG. 7A. As shown in FIG. 7A, the ejection direction from the ion ejection part 14a and the ion ejection part 14b
And the direction in which the residual ions that have jumped out are in a direction in which the residual ions that have jumped out are away from each other.

In the figure, 13a and 13b are insulators for preventing electric shock.

The circuit of the static eliminator shown in FIGS. 7A and 7B will be described with reference to FIG. 7C. In FIG. 7C, the illustration of the transformer is omitted, and in reality, the AC high-voltage power supply 10 and the high-voltage core wire 5
A transformer is interposed between a and 5b. An alternating high voltage from an alternating high voltage power supply 10 is applied to each high voltage core wire 5a, 5b. The discharge electrodes 3a, 3b are capacitively coupled to the high voltage core wires 5a, 5b, respectively, and an alternating high voltage is generated also in the discharge electrodes 3a, 3b. As a result, almost equal amounts of ions and ions are generated near the discharge electrodes 3a and 3b by the corona discharge. A high positive voltage is applied to one of the absorbing electrodes 12a from the high voltage DC power supply 11a, and ions among the ions generated near the discharge electrode 3a are absorbed by the absorbing electrode 12a and disappear. As a result, a large number of ions mainly remain as residual ions. On the other hand, a negative high voltage is applied from the DC high voltage power supply 11b to the other absorbing electrode 12b. As a result, of the ions generated in the vicinity of the discharge electrode 3b, the ions are absorbed by the absorption electrode 12b and disappear, and the residual ions mainly remain. Due to such a circuit configuration, mainly the ions are ejected from the ion ejecting portion 14a shown in FIG. 7A toward the charged object 6 and the negatively charged part of the charged object 6 is eliminated. . On the other hand, mainly the ions are ejected from the ion ejecting portion 14b, and the positively charged portion of the charged material 6 is eliminated. As shown in FIG. 7A, the residual ions ejected from the ion ejecting portions 14a and 14b are ejected from the ion ejecting portion 14a and the ion ejecting portion 14b in order to eject in a direction away from each other. There is no inconvenience that the ions will be recombined with each other and will disappear. The absorption electrode 12a constitutes a first electrode to which a voltage is applied to absorb one polarity of anion and cation. The absorbing electrode 12b constitutes a second electrode that absorbs ions having a polarity opposite to that of the ions absorbed by the first electrode. Further, by the container 1, the ion projecting portions 14a, 14b, the discharge electrodes 3a, 3b and the absorbing electrodes 12a, 12b, the first
Of the useful ions after being absorbed by the second electrode and the useful ions after being absorbed by the second electrode so as not to recombine with each other and irradiate the charged object while separating the useful ions from each other. Means are configured.

8A and 8B show still another embodiment of the static eliminator according to the present invention, FIG. 8A is a transverse sectional view, and FIG. 8B is a circuit diagram.

The body 1 is divided into two by a partition member 18. A discharge electrode 3a, which is capacitively coupled to the high voltage core wire 5a, is provided in one of the two divided body bodies 1. An absorption electrode as an example of a first electrode for absorbing one polarity ion of the ions generated by the discharge electrode 3a
12a is provided. A discharge electrode 3b that is capacitively coupled to the high-voltage core wire 5b is provided in the other body portion of the two-divided body 1, and one of the polarities of the ions generated near the discharge electrode 3b is provided. An absorbing electrode 12b, which is an example of a second electrode, is provided to absorb the ions.
The outer sides of these absorbing electrodes 12a, 12b are covered with an insulator 13, so that the static electricity removal worker unexpectedly absorbs the absorbing electrodes 12a, 12b.
It is possible to prevent electric shock from touching and to prevent sparks from being generated.

An alternating high voltage from an alternating high voltage power supply 10 is applied to the high voltage core wires 5a and 5b as shown in FIG. 8B. High voltage core wire 5a, 5b
When an AC high voltage is applied to the discharge electrodes 3a and 3b, which are capacitively coupled to them, AC of the same period is generated.
More ions and ions are generated by the corona discharge generated by the voltage generated at the discharge electrodes 3a, 3b. A positive voltage is applied to the one absorption electrode 12a from the DC high-voltage power supply 11a, and ions among the ions generated near the discharge electrode 3a are absorbed by the absorption electrode 12a and disappear. A negative high voltage is applied to the other absorbing electrode 12b from the DC high-voltage power supply 11b, and among the ions generated near the discharge electrode 3b, the ions are absorbed and disappear. As a result, the ions mainly remain as residual ions in the vicinity of the discharge electrode 3a, and the ions remain as residual ions in the vicinity of the discharge electrode 3b. Although illustration of the transformer as shown in FIG. 2 is omitted in FIG. 8B, the transformer is actually interposed between the AC power supply 10 and the high voltage core wires 5a and 5b.

As described above, mainly the ions remain in the vicinity of the discharge electrode 3a and the ions mainly remain in the vicinity of the discharge electrode 3b, but these two residual ions are separated by the partition member 18 shown in FIG. 8A. Therefore, they do not recombine with each other and disappear. As a result, the ions and the ions move to the side of the charged object 6, the positively charged part of the charged object 6 is neutralized by the ion, and the negatively charged part of the charged object 6 is neutralized by the ion. The partition member 18 may be a hard member made of plastic or the like, or may be a flexible member such as rubber. Due to the partition member 18, the discharge electrodes 3a and 3b, and the absorbing electrode 12, the useful ions after being absorbed by the first electrode and the useful ions after being absorbed by the second electrode are not recombined with each other. Thus, useful ion separation irradiation means for irradiating a charged object while separating both useful ions from each other is configured.

9A and 9B show still another example of the static eliminator according to the present invention. FIG. 9A is a transverse sectional view and FIG. 9B is a partially cutaway perspective view. Since the static eliminator shown in FIGS. 9A and 9B uses the same control circuit as the control circuit shown in FIG. 8B, the description thereof will not be repeated here.

Discharge electrodes 3a and 3b, which are capacitively coupled to the high voltage core wires 5a and 5b, are provided. Ions of the generated ions generated near the discharge electrode 3a are absorbed by the absorption electrode 12a, which is an example of the first electrode, and disappear. on the other hand,
Ions of the generated ions generated near the discharge electrode 3b are absorbed by the absorption electrode 12b, which is an example of the second electrode, and disappear. As a result, the ions remain near the discharge electrode 3a, and the ions remain near the discharge electrode 3b. Reference numeral 15 in the drawing denotes a fan, and the air blown from the fan 15 is blown downward from a plurality of air curtain blower openings 17 to form an air curtain that divides the body 1 into two. The air curtain prevents the ions generated in the vicinity of the discharge electrode 3a and the ions generated in the vicinity of the discharge electrode 3b from being separated from each other, crossing each other, and recombining and disappearing. As a result, the ions move to the charged object 6 side without recombination and disappearance,
Electrified matter is efficiently removed over a long distance. Fan 15, air curtain blower 17, discharge electrodes 3a, 3b and absorption electrode
By 12a and 12b, the useful ions after being absorbed by the first electrode and the useful ions after being absorbed by the second electrode do not recombine with each other, and both useful ions are separated from each other to form a charged object. A useful ion separation irradiation means for irradiating is configured. In the figure, 13 is the absorption electrode 12.
It is an insulator that covers the outside of a and 12b and is used to prevent electric shock and sparks.

FIGS. 10A, 10B and 11 show still another example of the static eliminator according to the present invention, and FIG. 10A shows its control circuit,
FIG. 0B is a diagram showing a graph showing the detection signal of the potential sensor 27 of FIG. 10A, and FIG. 11 is a flowchart for explaining the operation of the control circuit shown in FIG. 10A.

Referring to FIG. 10A, reference numeral 21 is a microcomputer which is an example of automatic control means and has a function of controlling the operation of various devices described below. Therefore, the microcomputer 21 is composed of, for example, several chips of LSI, in which the control operation can be executed in a predetermined procedure.
ROM2 that stores operation program data for MPU22 and MPU22
4 and a RAM 23 capable of writing and reading necessary data.

Further, the microcomputer 21 receives the input signal
An input / output interface 25 that gives input data to the MPU22 and receives output data from the MPU22 and outputs it externally.
Have. Further, although not shown, the microcomputer 21 divides the clock signal from the power-on reset circuit that gives a reset pulse to the MPU 22 when the power is turned on, the clock generation circuit that gives a clock signal to the MPU 22, and the clock signal from the clock generation circuit. Interrupt pulse periodically MP
It includes a pulse frequency dividing circuit (interrupt pulse generating circuit) applied to U22 and an address decoding circuit for decoding address data from MPU22.

The MPU 22 can execute the operation of the interrupt control routine according to the interrupt pulse which is periodically given from the pulse frequency dividing circuit. Also, the address decoding circuit
Decode the address data from MPU22, ROM24, RAM2
3, Chip select signals are applied to the input / output interface 25, respectively.

In the figure, 10 is an AC high-voltage power supply for applying an AC high voltage to the high-voltage core wire 5. An AC voltage having the same cycle as the AC high voltage applied to the high voltage core wire 5 is generated at the discharge electrode 3 capacitively coupled to the high voltage core wire 5. A large number of ions are generated in the vicinity of the discharge electrode 3 by the corona discharge based on the AC high voltage of the discharge electrode 3.
An absorption electrode 12 for electrically absorbing and extinguishing one of the ions of one polarity is provided. The outer side of the absorbing electrode 12 is covered with an insulator 13, which prevents a static eliminator from touching the absorbing electrode 12 and receiving an electric shock, and also prevents generation of sparks. Reference numeral 29 in the figure is a motor for rotating the roller 28b. When the motor 28 rotates the roller 28b, the charged object 6 sandwiched between the roller 28b and the other roller 28a is conveyed. When the charged object is conveyed from the left side in the drawing, the charged object detection switch 26 detects the charged object, and the charged object detection signal is input to the microcomputer 21 via the detection circuit 31. Microcomputer
Reference numeral 21 gives a rotation drive control signal to a motor 29 via a motor drive circuit 30 to receive the conveyed charged object and further convey it in the right direction in the drawing. Then, the motor 29 is driven to rotate the roller 28b in the direction of the arrow in the drawing, and the charged material 6 is conveyed in the direction of the arrow (to the right in the drawing). The potential of the charged object 6 during conveyance is detected by the potential sensor 27, and the potential detection signal V (x) is input to the microcomputer 21 via the detection circuit 32. The microcomputer 21
Based on the conveyance of the charged object 6 and the potential detection signal from the potential sensor 27, the absorption electrode control signal is given to the D / A converter 20, and the voltage controlled by being digital-analog converted by the D / A converter 20 is controlled. It is applied to the absorbing electrode 12. In the figure, l ₁ is the distance between the discharge electrode 3 and the central position of the charged object detection switch 26, and l is the discharge electrode 3 and the potential sensor.
The distance from the center of 27 is shown. Potential sensor 27, detection circuit 3
One of cations and anions generated in the vicinity of the first electrode by the corona discharge by the two rollers 28a and 28b, the motor 29, the motor drive circuit 30, the microcomputer 21, and the D / A converter 20. A voltage application unit is configured to apply a voltage for electrically absorbing polar ions to the absorption electrode to change the completion ratio of the cations and anions.

FIG. 10B is a diagram showing a graph showing the potential detection output V (x) of the potential sensor 27 shown in FIG. 10A. In FIG. 10B, the vertical axis V represents the potential, and the horizontal axis x represents the transport distance of the charged material 6. That is, the horizontal axis x has the origin 0 at the position of the charged object 6 at which the potential of the charged object 6 is first detected by the potential sensor 27, and the distance along the horizontal axis x at which the charged object 6 is transported from that position. The one-dot chain line indicated by m indicates the position of the discharge electrode 3, the one-dot chain line indicated by n indicates the central position of the potential sensor 27, and the distance between the two one-dot chain lines m, n is l.

Next, the operation of the control circuit shown in FIG. 10A will be described with reference to FIG.

In step S (hereinafter simply referred to as S) 1, it is determined whether or not the charged object detection switch is turned on, and the process waits until it is turned on. When the charged object 6 is conveyed, the charged object detection switch 26 detects the charged object 6 and YE is executed by S1.
The judgment of S is made, and the routine proceeds to S2, where the motor constant speed rotation is controlled. As a result, the motor 29 rotates at a constant speed and the charged material 6 is conveyed at a constant speed. Next, by S3, it is determined whether the potential sensor detects the potential of the charged object,
Wait until detected. When the potential sensor 27 detects the potential of the charged object 6, the process proceeds to S4, and the timer starts counting the time t. Next, in S6, the rotation speed N of the motor is determined based on the detection output V (x) of the potential sensor.
The process of calculating (x) is performed. The detection output V (x) of this potential sensor is V (x) shown in FIG. 10B. By this S6, the rotation speed N of the motor corresponding to the maximum conveying speed of the charged object which is allowable in consideration of the potential of the charged object
(X) is calculated. In the calculation by S6, the experimental results shown in FIG. 15 described later are considered. Next, in S7, a process of calculating the neutralization voltage V ₂ (x) based on the detection output V (x) of the potential sensor is performed. By this S7, the neutralization voltage V ₂ (x) that can most efficiently eliminate the electric charges in consideration of the potential of the charged object is calculated. This neutralizing voltage V
₂ (x) is also a function of the transport distance x of the charged object. Next, in S8, it is determined whether or not the timer has counted l / v. This l is the distance between the discharge electrode 3 and the central position of the potential sensor 27 shown in FIG. 10A, and v is the transport speed of the charged material, which is strictly a function of time t. Referring to FIG. 10A, the timer starts timing from the time when the charged object 6 is conveyed and the potential of the charged object 6 is first detected by the potential sensor 27, and the potential is first detected. The time required for the detected portion to be conveyed to just below the discharge electrode 3 is l / v. As described above, when the detection position first detected by the potential sensor does not reach directly below the discharge electrode 3, NO is determined by S8.
Returning to S6, the processing of S6 and S7 is continued. On the other hand, when the detection position detected by the potential sensor is conveyed to just below the discharge electrode 3, YES is determined by S8 and the process proceeds to S9, and the process of controlling the rotation speed of the motor to N (xl) is performed. Done. As shown in FIG. 10A, the discharge electrode 3 is actually taken into consideration in consideration of the detection position and the detection output by the potential sensor 27.
Since there is a deviation of 1 from the charge removal position where the charge is removed by, the amount of deviation is estimated and the transport distance x of the charged object is calculated by S9.
The actual motor rotation control is performed by subtracting the deviation amount l from the above. Next, in S10, the voltage V ₂ (x
-L) is applied. Also in this processing in S10, as in S9, subtraction control is performed by the shift amount 1 between the position detected by the potential sensor 27 and the lower position of the discharge electrode 3 at which static elimination is actually performed. The rotation of the motor 29 is actually controlled by S9, and the neutralization electrode 12 is actually controlled by S10.
A voltage for neutralization is applied to.

Next, in S11, it is determined whether or not the charged object detection switch 26 has been turned off. If it is not turned off, the process proceeds to S6 and the control of S6 to S10 is continued.
When the left end of the charged object 6 in FIG. 10A passes through the start switch 26, the start switch 26 is turned off, YES is determined in S11, and the process proceeds to S12. In S12,
When the start switch is turned off, the timer time t
A process of storing ₁ is performed. Next, in S13, the timer
It is determined whether or not t ₁ + l ₁ / v is timed. If it is determined that the timer has not yet timed,
Returning to S6, the processing of S6 to S12 is continued. On the other hand, the first
In FIG. 0A, the left end of the charged object 6 is the charged object detection switch 26.
The time required for the sheet to be conveyed to just below the discharge electrode 3 after passing through is 1 ₁ / v, and the time when the left end of the charged object 6 passes the start switch 26 is t ₁ , so the timer is At the time when “t ₁ + l ₁ / v” is timed, the left end of the charged object 6 is positioned directly below the discharge electrode 3. If that happens, S1
A determination of YES is made by 3, the process proceeds to S14, the timer is cleared, and the process returns to S1.

S7 and S10 constitute voltage control means for controlling the voltage applied to the neutralizing electrode based on the data on the potential associated with the charging of the charged object.

FIG. 12 is a perspective view of a main part showing still another example of the static eliminator according to the present invention. In the above-described embodiment, the absorption electrode 12 is used.
, Which also serves as one of the discharge electrodes, is shown in FIG. 12 in which an absorbing electrode is separately provided.
In the figure, 10 is an AC high voltage power supply, 5 is a high voltage core wire, 8 is a capacitive coupling body that is capacitively coupled to the high voltage core wire 3, 3 is a discharge electrode projecting downward from the capacitive coupling body 8, Reference numeral 4 is a ground electrode connected to the ground, and 6 is a charged material conveyed in the arrow direction. Further, in the static eliminator shown in FIG. 12, the absorbing electrode 12 has a mesh shape. DC high voltage power supplies 11a, 11b for applying a high DC voltage to the absorbing electrode 12 are provided,
A positive voltage is applied to the absorption electrode 12 by switching the switch 34 to the arrow a side, and a negative voltage is applied to the absorption electrode 12 by switching the switch 34 to the arrow b side. When the charged object 6 is negatively charged, it is necessary to absorb the ions among the generated ions, so the switch 34 is switched to the arrow a side to absorb the absorption electrode 12.
Apply a positive voltage to. On the other hand, when the charged material 6 is positively charged, it is necessary to absorb the ions among the generated ions, so the switch 34 is switched to the arrow b side and a negative voltage is applied to the absorption electrode 12.

13A to 13D are perspective views showing other examples of the absorbing electrode. The neutralizing electrode 12 may have a U-shaped cross section as shown in FIG. 13A, or may have a hollow pipe shape as shown in FIG. 13B. First
It may be wire-shaped as shown in FIG. 13C. Further, as shown in FIG. 13D, a large number of needle-shaped electrodes may be implanted in a metal plate to form an absorption electrode. The material of the absorbing electrode 12 is a conductor or a semiconductor.

Absorbable electrode capable of electrically absorbing generated ions generated by corona discharge by the absorbing electrode 12 also serving as one of the above-mentioned discharge electrodes or the separately provided discharging electrode 12 shown in FIG. Is configured.

In addition, for example, when the charged object is mainly negatively charged and a very small part has a positively charged portion,
First, the removal device (first charge removal device) according to the present invention having the absorption electrode 12 is used to remove the negative charge, and then the negative charge is removed, and then, FIG. 18A, FIG. 18B, FIG. 17, FIG. The positively charged portion may be discharged by a conventional type removing device (second discharging device) having the ground electrode 4 shown in FIG. In that case, the negatively charged portion can be efficiently discharged by the static eliminator having the absorbing electrode 12 and exhibits a strong static eliminating action, and the positively charged portion can be effectively removed by the grounding electrode holding type eliminator which does not exhibit such a strong static erasing action. Charge is removed satisfactorily.

On the other hand, for example, the absorption electrode 12 is configured to be connected to the ground by switching the switch 34 shown in FIG. 5A, and the absorption electrode 12 is set to the ground electrode as necessary in consideration of the charging state of the charged object. You may make it static-eliminate.

14A and 14B are sectional views showing the internal pressure explosion-proof type removing device. In this internal-pressure explosion-proof type removal device, the discharge electrode 3 and the absorption electrode 12 are housed in a cylindrical container body 80 made of an insulating material such as vinyl chloride, and the container body 80 has an ion ejection port.
A plurality of 81 are provided. Then, air is blown in the direction of arrow A by a fan, a compressor, etc., an internal pressure is applied to the inside of the body 80, and the air is blown out from the ion ejection port 81. The outer circumference of the container 80 may be covered with a metal plate.

FIG. 15 is a cross-sectional view showing a nozzle type static eliminator. In this nozzle type removing device, the discharge electrode 3 and the absorbing electrode 12 are provided inside a cylindrical body 83 having a nozzle 82 for blowing air, and the air sent by a fan or a compressor is blown out from the nozzle 82. In addition, the generated ions are blown out together with the blown air so that the charged object can be irradiated.

FIG. 16A to FIG. 16C are diagrams showing an experimental device for showing the long-distance static elimination performance of the static eliminator of the present invention and the experimental results thereof.

FIG. 16A is a circuit diagram of an experimental device used for an experiment of long-distance static elimination performance. In the figure, 6 is a charged object, 3 is a discharge electrode, 12
Is an absorption electrode, 10 is an AC high voltage power supply, 11 is a DC high voltage power supply,
34 is a switch, 84 is a static elimination current measuring device, and 85 is a charging power source. If the charged object 6 is discharged by using this experimental device,
By passing a current corresponding to the discharged current through the static elimination current measuring device 84, the amperes of the static eliminated current can be measured. 16B shows the experimental results when a voltage of minus 1 kilovolt was applied to the charged object 6, and FIG. 16C shows the experimental results when a voltage of minus 10 kilovolts was applied to the charged object 6.

The horizontal axis in FIGS. 16B and 16C represents the distance L between the removing device shown in FIG. 16A and the charged object 6, and is represented by a logarithmic memory. The vertical axis of FIGS. 16B and 16C is
The static elimination current (μA) measured by the static elimination current measuring device 84 is shown and represented by a logarithmic memory. The three curves shown in FIGS. 16B and 16C show the experimental results when the voltage of 0V, + 2.5KV, + 5KV is applied to the absorption electrode 12 by switching the switch 34, respectively. Is. The AC high-voltage power supply 10 applies a voltage of 7 KV. Moreover, the removing device has a needle pitch of the discharge electrode 3 of 10
mm, capacitive coupling 3.3 PF, the distance between one of the discharge electrodes on the one end side and the one on the other end side, that is, the effective length is 20
0mm, the frequency of AC high power supply 10 is 60Hz. No. 16B
As shown in FIG. 16 and FIG. 16C, in comparison with the conventional static eliminator in which 0 V is applied to the absorption electrode 12, the long-distance static elimination performance is extremely excellent when 2.5 KV and 5 KV are applied to the absorption electrode 12. There is.

FIG. 17A to FIG. 17E are diagrams showing the static elimination rate experimental apparatus and the experimental results thereof.

Referring to FIG. 17A, reference numeral 114 in the drawing is a charged material, which is fixedly mounted on the two endless belts 110. The endless belt 110 is stretched around rollers 111 and 112, and the roller 112 is configured to be rotationally driven by a servo motor 113. Reference numeral 116 in the figure is a power source for charging a charged object 114 such as a film, and is configured to be switchable between positive and negative by a switch 34. The voltage from the power source 116 is applied to the charging electrode 117, and the charging electrode 1
The charged material 114 is charged by 17 to a predetermined potential. With the charged object 114 charged, the servo motor 113 is rotated a predetermined number of times to stop the charged object 114 while it is conveyed directly below the electrostatic electrometer 118. In that state, the potential of the charged object 114 is read by the electrostatic electrometer 118. Next, the servo motor 113 is rapidly rotated to convey the charged material 114 to the left in the drawing at a constant high speed, and passes under the removing device including the discharge electrode 3 and the absorbing electrode 12 at a constant speed. Let In the figure, 11 is a DC high voltage power supply for applying a constant voltage to the absorption electrode,
The applied voltage is switched by the switch to 0V, + 2.5KV, + 5KV. In the figure, 10 is an AC high-voltage power supply for generating an AC voltage of 60 HZ on the discharge electrode 3, and a voltage of 7 KV can be applied. A shielding plate 119 is provided at the lower left and right positions of the static eliminator, and the measurement becomes inaccurate because the generated ions from the static eliminator spread to the left and right and are unnecessarily irradiated to the charged object 114. Is prevented. Next, the charged object 114 is transferred to the electrostatic electrometer 120.
At a stage immediately below, the servo motor 113 suddenly stops to stop the charged object 114. In that state, the electrostatic potential meter 120 detects the potential of the charged object 114 after static elimination to measure the residual voltage. The charged object 114 has a size of 200 × 200 mm, and the distance from the static eliminator to the shielding plate 119 is 200 mm.
The distance between the pair of shield plates 119 is 200 mm. Then, the frequency of the controller of the servo motor 113 is converted to change the charged object 114
And the residual voltage of the charged material was measured.

FIG. 17B is a diagram showing the measurement result when the charging voltage of the charged object before charge removal is +10 KV. The vertical axis represents the residual voltage (KV) of the charged object, and the horizontal axis represents the running speed (m / sec) of the charged object. The three curves shown in the figure show the cases where the voltage applied to the absorption electrode 12 is 0 V, −2.5 KV, and −5 KV, respectively. It should be noted that even if the voltage applied to the absorbing electrode 12 is a pulsating current that is double-wave rectified instead of direct current, the experimental results are almost unchanged.

FIG. 17C shows the case where the charged object is charged to −10 KV, and the other conditions are the same as those in FIG. 17B. In addition, the experimental data of FIGS. 17B and 17C were carried out in an environment at a humidity of 70% V and a temperature of 25 ° C. Further, as the removing device used in the experiment, one having a discharge electrode needle pitch of 10 mm and a distance between the discharge electrode on one end side and the discharge electrode on the other end side of the discharge electrodes, that is, an effective length of 200 mm was used.

FIG. 17D is a diagram showing experimental data in the case where the voltage applied to the absorbing electrode 12 is changed to direct current to form a half-wave rectified pulsating flow.

FIG. 17D is a diagram showing experimental data when the charged object is charged by +10 KV. Then, the experiment was conducted in an environment of a humidity of 55% and a temperature of 22 ° C. The three curves in the figure are the half-wave rectified voltage (pulsating current) applied to the absorption electrode 12, respectively.
Shows the case of 0V, −2.5KV, −5KV. In addition, conditions such as the distance between the static eliminator and the charged object (film) and the electrode are the same as those in the case of FIGS. 17B and 17C.

FIG. 17E is a diagram showing an experimental result in the case where a charged object is −10 KV charged. The other conditions are the same as those shown in FIG. 17D.

As can be seen from Figures 17D and 17E, the absorption electrode
Even when a half-wave rectified pulsating flow is applied to 12, it can be seen that static elimination is performed at a faster speed than the conventional removal device when the voltage applied to the absorption electrode 10 is 0V. .

[Effect of the invention] According to the present invention described in claim 1, one polarity of the generated ions is reduced and the cation and the anion do not have a ratio of about 1: 1. The generated bipolar ions are not recombined and all disappear during the movement to the charged object, and the generated ions can easily reach the distant charged object, and the long-distance charge removal can be performed. Moreover,
Since the amount of ozone generated is reduced, the effect of reducing the foul odor associated with the generation of ozone is also achieved. A second voltage having a potential difference with respect to the first voltage applied to the first discharge electrode and having a potential opposite to that of ions generated and having a polarity opposite to that of ions which are unnecessary and desired to be removed among the generated ions. Is applied to the second discharge electrode, the second discharge electrode is
While maintaining the original function of the discharge electrode to generate ions, it is also possible to exert the function as an absorbable electrode that absorbs unnecessary ions, eliminating the need for a special absorbable electrode. It is possible to reduce the cost due to the decrease of In addition, the structure is simple and manufacturing is easy.

According to the present invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to prevent as much as possible an electric shock when a worker who is performing static elimination unexpectedly touches the absorbable electrode and sparks. Can be prevented as much as possible and safety can be improved.

According to the present invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is necessary to keep the polarity and ratio of the ions completed by switching and adjusting the applied voltage switching means. The amount can be maintained, and good charge removal can be achieved.

According to the present invention described in claim 4, in the above-described first state, the absorptive electrode absorbs and reduces negative ions, and the recombination of positive and negative ions can be reduced. In the state, a large amount of ions are generated and negative ions are absorbed by the absorbable electrode to generate a large amount of positive ions, and when the discharge electrode is switched to the positive potential, the positive ions are charged all at once. In the state where the positive ions are attracted toward the object, and then in the third state, positive ions are absorbed by the absorptive electrode and a large amount of negative ions mainly remain, and further in the fourth state, negative ions are absorbed. A large amount of ions remain, and by switching the first to fourth states over time, efficient long-distance charge removal can be performed and the charged object can be partially removed. It can satisfactorily neutralization versa charged portion when there is a portion of a reverse charging.

According to the present invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, the charged state of the charged object is determined based on the data on the potential associated with the charging of the charged object. It is possible to perform fine static elimination in consideration of the above.

According to the sixth aspect of the present invention, the control of the amount of unwanted ions absorbed by the absorptive electrode and the control of the relative movement speed are used in combination to eliminate the excess and deficiency of the static electricity while moving the static elimination target object relatively. You can

According to the invention described in claim 7, in addition to the effect of the invention described in claim 1, among the first electrode and the second electrode,
Since one electrode mainly irradiates with cations and the other electrode mainly irradiates with anions, it is possible to satisfactorily eliminate charge even from a partially charged positively or negatively charged object. It is possible to prevent the useful ions composed of cations and the useful ions composed mainly of anions from recombining and disappearing as much as possible, and it is possible to prevent deterioration of the static elimination efficiency as much as possible.

According to the present invention described in claim 8, in addition to the effect of the invention described in claim 7, by irradiating the both useful ions in a direction away from each other, recombination of the both useful ions can be easily and It can be prevented satisfactorily.

According to the present invention described in claim 9, in addition to the effect of the invention described in claim 7, recombination of the both useful ions can be reliably prevented by the partition member.

According to the present invention of claim 10, in addition to the effect of the invention of claim 7, recombination of the both useful ions is prevented by the air curtain. Compared with the case of preventing, there is no inconvenience that the partition member collides with the charged object and interferes with the static elimination work, and the static elimination work can be performed easily.

According to the present invention described in claim 11, in addition to the effect of the invention described in any one of claims 1 to 10, sparks and the like inadvertently intrude from the ion ejection port, causing inconvenience such as explosion. This can be prevented as much as possible, and the safety of the static elimination work can be improved.

According to the present invention described in claim 12, in addition to the effect of the invention described in any one of claims 1 to 10, since the generated ions are blown out from the nozzle together with the air, a further long distance is achieved. Static elimination is possible.

According to the present invention as set forth in claim 13, by combining the static elimination by the first static eliminator and the static elimination by the second static eliminator, it is possible to slightly reverse the charge in the charged object having almost one polarity. Even if there is a reversely charged portion that is charged to the opposite polarity, the reversely charged portion can be satisfactorily discharged.

[Brief description of drawings]

1A and 1B show an example of the static eliminator according to the present invention. FIG. 1A is a cross-sectional view and FIG. 1B is a front view. FIG. 2 is a circuit diagram of the static eliminator shown in FIGS. 1A and 1B. FIG. 3 is an operation explanatory view showing an operation of the static eliminator shown in FIGS. 1A, 1B and 2. 4A and 4B show voltage V ₁ and voltage V _{2 in} FIG.
It is a figure showing the graph which shows and. 5A to 5D show another example of the static eliminator according to the present invention, and FIGS. 5A and 5C are circuit diagrams, FIG. 5B, FIG. 5D,
5A and 5B are operation explanatory diagrams of the circuits shown in FIGS. 5A and 5C, respectively. FIG. 6 is a circuit diagram showing still another example of the static eliminator according to the present invention. 7A, 7B, and 7C show still another example of the static eliminator according to the present invention. FIG. 7A is a cross sectional view thereof, FIG. 7B is a partially cutaway perspective view, and FIG. 7C is It is a control circuit diagram. 8A and 8B show still another example of the static eliminator according to the present invention, FIG. 8A is a cross sectional view thereof, and FIG. 8B is a circuit diagram. 9A and 9B show still another example of the static eliminator according to the present invention. FIG. 9A is a transverse sectional view thereof, and FIG. 9B is a partially cutaway perspective view thereof. 10A and 10B show still another example of the static eliminator according to the present invention, FIG. 10A is a control circuit diagram thereof, and FIG. 10B is a graph showing a detection output of a potential sensor. FIG. 11 is a flow chart for explaining the operation of the control circuit of FIG. 10A. FIG. 12 is a perspective view of a main part showing still another example of the static eliminator according to the present invention. FIG. 13A, FIG. 13B, FIG. 13C, and FIG. 13D are perspective views showing another example of the absorbing electrode used in the static eliminator according to the present invention. 14A and 14B are cross-sectional views showing an internal pressure explosion-proof static eliminator. FIG. 15 is a cross-sectional view showing a nozzle type removing device. FIG. 16A is a configuration diagram of an experimental apparatus for measuring the long-distance static elimination performance, and FIGS. 16B and 16C are graphs showing experimental data thereof. FIG. 17A is a block diagram of an experimental device for measuring the static elimination rate, and FIGS. 17B to 17E are graphs showing experimental data thereof. 18A and 18B show a conventional static eliminator,
FIG. A is a cross sectional view thereof and FIG. 18B is a front view thereof. FIG. 19 is a circuit diagram of the conventional static eliminator shown in FIGS. 18A and 18B. 20A and 20B are operation explanatory views showing the operation of the conventional static eliminator shown in FIGS. 18A, 18B, and 19. FIG. 21 is an operation explanatory view showing another example of the conventional static eliminator. In the figure, 3,3a and 3b are discharge electrodes, 6 is a charged object, 10 is an AC high voltage power supply, 11 is a DC high voltage power supply, 12,12a and 12b are absorption electrodes, 15
Is a fan, 17 is an air curtain blowing port, 18 is a partition member, 21 is a microcomputer, and 27 is a potential sensor.

Claims (13)

[Claims] 1. A static eliminator which has a first discharge electrode and a second discharge electrode for corona discharge, and discharges a charged object by utilizing ions generated by the corona discharge. While applying a first voltage to the discharge electrode of
A second voltage having a potential difference with respect to the first voltage and having a polarity opposite to that of ions that are unnecessary and need to be removed among the generated ions is applied to the second discharge electrode. The second discharge electrode is also used as an absorptive electrode for electrically absorbing one of positive and negative ions generated by the corona discharge. A static eliminator characterized by. 2. The static eliminator according to claim 1, further comprising an insulator for preventing electric shock due to the absorbable electrode. 3. The voltage applying means includes a DC / pulsating voltage applying means for applying a DC voltage or a pulsating voltage to the absorptive electrode to maintain the polarity of ions to be absorbed. A voltage polarity switching means for switching the polarity of the voltage applied by the voltage applying means is further included, and the polarity and proportion of the ions formed by switching and adjusting the voltage polarity switching means can be effectively maintained and maintained at a necessary amount. The static eliminator according to Item 1 or 2. 4. A static eliminator which has a discharge electrode for corona discharge and neutralizes a charged object by utilizing ions generated by corona discharge, which is an absorptive electrode capable of electrically absorbing the generated ions. And applying a voltage for electrically absorbing ions of one polarity of cations and anions generated in the vicinity of the discharge electrode by the corona discharge, to the absorptive electrode so that the cations and anions Voltage applying means for changing the ratio of the ions to be formed, the voltage applying means applying a voltage having a first frequency to the absorbable electrode, and applying the voltage of the first frequency to the discharge electrode different from the absorbable electrode. Characterized by including an alternating voltage applying means for applying a voltage of a second frequency different from the frequency of 1.
Static eliminator. 5. The voltage applying means includes voltage automatic control means for automatically controlling the voltage applied to the absorptive electrode on the basis of data relating to the potential associated with the charging of the charged material. The static eliminator according to any one of 1. 6. A static eliminator which has a discharge electrode for corona discharge and neutralizes a charged material by utilizing ions generated by corona discharge, which is an absorptive electrode capable of electrically absorbing the generated ions. And a discharge electrode having the discharge electrode, which irradiates a charged material with generated ions, and electrically discharges one polarity of cations and anions generated near the discharge electrode by the corona discharge. A voltage applying unit that applies a voltage for absorbing to the absorptive electrode to change the completion ratio of the cations and anions; a relative moving unit that relatively moves the charged object and the charge eliminating unit; An input unit for inputting data relating to the charging status of the charged object in the relative movement direction, and an electric voltage applied to the absorptive electrode of the static elimination unit based on the data input from the input unit. To control the,
Controlling the relative movement means to control the relative movement speed of the static elimination unit and the charged material, and controlling both the amount of unwanted ions absorbed by the absorptive electrode and the relative movement speed control. A static eliminator comprising a mold control means. 7. The absorptive electrode comprises a first electrode to which a voltage for absorbing one of positive and negative ions is applied, and an ion absorbed by the first electrode. A second electrode to which a voltage for absorbing ions having a polarity opposite to the polarity is applied, and useful ions after being absorbed by the first electrode and after being absorbed by the second electrode 2. The static eliminator according to claim 1, further comprising a useful ion separating / irradiating means for irradiating the charged object while separating the both useful ions so that they do not recombine with each other by crossing each other. 8. The static eliminator according to claim 7, wherein said useful ion separation irradiation means includes means for irradiating said both useful ions in directions away from each other. 9. The static eliminator according to claim 7, wherein the useful ion separating / irradiating means includes a partition member for separating the both useful ions. 10. The static eliminator according to claim 7, wherein the useful ion separation / irradiation means includes an air curtain blowing port for creating an air curtain separating the two useful ions. 11. The discharge electrode and the absorbable electrode are:
Stored in an insulative body with a generated ion outlet,
The static eliminator according to any one of claims 1 to 10, wherein a predetermined internal pressure is applied to the container to cause generated ions to fly out from the ion flyout. 12. The discharge electrode and the absorbable electrode,
The static eliminator according to any one of claims 1 to 10, which is provided in a body having a nozzle that blows out air, and the generated ions blow out together with the air from the nozzle. 13. A first electrode having a discharge electrode for corona discharge, and an absorptive electrode to which a voltage for absorbing one polarity ion of ions generated by the corona discharge by the discharge electrode is applied. The first step of removing the charged object by the static eliminator, the discharge electrode for corona discharge, and the absorptive electrode capable of electrically absorbing the ions generated by the corona discharge by the discharge electrode and connected to the ground And a second step of discharging a charged object by a second discharging device having a charged electrode.