JP2020053224A - Static eraser - Google Patents

Abstract

To provide a static eraser that can sufficiently remove static electricity when transporting a charged object.SOLUTION: A static eraser includes conveying means 1 reciprocating in the conveying direction to convey an object to be conveyed 10, and static elimination means 4 which is accessible from above to the conveying means 1 and is electrically connected to the ground potential. The self-discharge static elimination of the object to be conveyed 10 can be realized by allowing the static elimination means 4 electrically connected to the ground potential to the conveying means 1 to be accessible from above.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a static eliminator and, more particularly, to a static eliminator for conveying a conveyed object with static electricity.

  In a product manufacturing process, if a product to be transported is charged with static electricity, it adversely affects the transport of the product.

  For example, when the product is a plastic container, in the manufacturing process, the plastic container carries high static electricity.

  As a method for removing static electricity, there is a method for removing static electricity using an ionizer as disclosed in Patent Document 1. The ionizer generates positive ions and negative ions.

JP 2013-07886 A

  However, since plastic is an insulator, the positive and negative polarities are non-uniformly charged. In the case of an insulator having non-uniformly charged polarity,-ions generated from the ionizer may not sufficiently reach a region charged to +. Therefore, the ionizer cannot sufficiently remove static electricity from the plastic container. If the static electricity of the plastic container is not sufficiently removed, the manufacturing device of the plastic container may also be charged with static electricity.

  As a result, the static electricity causes adsorption between the plastic containers and between the plastic container and the manufacturing apparatus, resulting in a problem that manufacturing efficiency is reduced.

  In addition, a plastic container charged with static electricity has a problem that foreign matter may adhere thereto and a defective product is generated.

  Therefore, an object of the present invention is to provide a static eliminator capable of sufficiently removing static electricity when a conveyed object is transported.

  In order to solve the above-mentioned problem, the static electricity removing device according to claim 1 is configured to approach or contact a transport unit that reciprocates along a transport direction for transporting an object to be transported, and a reciprocating transport unit from above or below. And static elimination means electrically connected to the ground potential.

  The static eliminator according to claim 1 performs self-discharge static elimination of the transport means or the transferred object by allowing the static elimination means electrically connected to the transport means to the ground potential to be able to approach or contact from above or below. Can be realized. Since the self-discharge static elimination is not affected by the polarity of the transported object, for example, even a transported object having a non-uniformly charged polarity such as plastic can sufficiently remove static electricity.

  The static electricity removing device according to the first aspect can utilize the reciprocation of the existing transport means, so that it is possible to suppress an increase in energy and a prolonged production time in a manufacturing process due to static electricity removal. In the static eliminator of the first aspect, the area where static electricity is sufficiently removed is the length of the static eliminator multiplied by the amount of movement that the transporter can reciprocate. Therefore, the static electricity elimination device according to the first aspect can realize more stable static electricity elimination of the conveying means or the conveyed object as compared with the ionizer.

  According to a second aspect of the present invention, in the static eliminator according to the first aspect, when the transport unit moves in the transport direction together with the transported object, the static eliminator approaches or comes into contact with the transported object.

  The static electricity removing device according to the second aspect has the same operation as that of the first aspect, and can remove the static electricity of the transported object in the movement in the transport direction which is the reciprocating motion.

  A static eliminator according to a third aspect of the present invention is the static eliminator according to the first or second aspect, wherein the static eliminator approaches or comes into contact with the transport unit when only the transport unit moves in a direction opposite to the transport direction.

  The static eliminator according to the third aspect has the same operation as the first or second aspect, and can also remove the static electricity of the transport means in the movement in the direction opposite to the transport direction, which is the return of the reciprocating motion.

  5. A static eliminator according to claim 4, wherein said transport means reciprocates in a transport direction for transporting the transported article, a loading means on which the transported article transported by said transport means is placed, and a loading means. And a static eliminator electrically connected to the ground potential, wherein the static eliminator approaches the mounting means or the conveyed object placed on the mounting means. Or, they come into contact and move in the direction opposite to the transport direction.

  According to a fourth aspect of the present invention, the static eliminator electrically connected to the transport means to the ground potential can approach or contact from above or below, so that self-discharge static elimination of the placing means or the transferred object can be achieved. Can be realized. Since the self-discharge static elimination is not affected by the polarity of the transported object, for example, even a transported object having a non-uniformly charged polarity such as plastic can sufficiently remove static electricity.

  Since the static electricity removing device according to the fourth aspect can utilize the reciprocation of the existing transport means, it is possible to suppress an increase in energy and a prolonged production time in a manufacturing process due to static electricity removal. Further, in the static electricity removing device according to the fourth aspect, the area where static electricity is sufficiently removed is the length of the static electricity removing means times the moving amount of the reciprocating movement of the conveying means. Therefore, the static electricity removing device according to claim 4 can realize more stable static electricity removal of the placing means or the transported object than the ionizer.

  According to a fifth aspect of the present invention, there is provided the static eliminator according to the fourth aspect, wherein the position of the static elimination means can be changed according to the height of the conveyed object placed on the placing means. I have.

  The static eliminator according to the fifth aspect has the same function as that of the fourth aspect, and further includes, for example, a case in which the transported objects are stacked and the height of the transported object on the mounting means fluctuates. In addition, static electricity can be sufficiently removed.

  The static eliminator according to claim 6 is the static eliminator according to claim 4 or 5, further comprising another static eliminator that is accessible or capable of contacting the transport means and is electrically connected to the ground potential. The other static elimination means approaches or comes into contact with the conveyance means moving in the direction opposite to the conveyance direction.

  The static electricity removing device according to the sixth aspect has the same operation as the fourth or fifth aspect, and can also remove the static electricity of the transporting means in the movement in the direction opposite to the transport direction which is the return of the reciprocating motion.

  The static electricity removing device according to any one of the first to sixth aspects suppresses generation of suction between objects to be conveyed and adsorption between the object to be conveyed and the manufacturing apparatus due to static electricity, thereby improving manufacturing efficiency. The static electricity removing device according to any one of the first to sixth aspects can suppress a foreign substance from adhering to a transported object charged with static electricity, and can reduce the incidence of defective products.

1 is a schematic diagram of a cutting machine including a static eliminator according to the present invention, showing a process of transporting a molded plastic sheet to the cutting machine and cutting the sheet. 1 is a schematic diagram of a cutting machine including a static eliminator according to the present invention, showing a process of transporting a molded plastic sheet to the cutting machine and cutting the sheet. FIG. 2 is a schematic view of a cutting machine including the static electricity removing device according to the present invention, showing a process until the cut plastic container is placed on the placing means. FIG. 2 is a schematic view of a cutting machine including the static electricity removing device according to the present invention, showing a process until the cut plastic container is placed on the placing means. FIG. 2 is a schematic view of a cutting machine including the static electricity removing device according to the present invention, showing a process until the cut plastic container is placed on the placing means.

  Hereinafter, a container cutting machine including the static electricity removing device according to the first embodiment of the present invention will be described.

  The cutting machine is for manufacturing a plastic container which is an insulator made of a polymer material. The cutting machine can efficiently mass-produce plastic containers by cutting plastic molded product sheets.

  FIG. 1 and FIG. 2 show steps from transporting a plastic molded product sheet to a cutting machine to cutting. 1 and 2 show a moving table 1, a platen 2, and a neutralization brush 4.

  The moving table 1 is a transporting unit that reciprocates a plastic molded product sheet 10 to be transported along a transport direction.

  The platen 2 is provided to be vertically movable above the moving table 1 at the cutting position. Air can be sucked and discharged from the bottom surface of the platen 2.

  The static elimination brush 4 is a static elimination means that can be approached from above to the reciprocating moving table 1. The discharging brush 4 is electrically connected to the ground potential.

  Hereinafter, steps from transporting a plastic molded product sheet to the cutting machine shown in FIGS. 1 and 2 until the sheet is cut will be described.

  FIG. 1A shows the initial positions of the moving table 1 and the neutralizing brush 4. At an initial position of the moving table 1, a plastic molded product sheet 10 is placed on the moving table 1 at a predetermined position.

  Next, the neutralization brush 4 descends from the initial position shown in FIG. 1A to the approach position shown in FIG. The approach position of the static elimination brush 4 is a position where a gap exists between the static elimination brush 4 and the molded product sheet 10 on the moving table 1 that moves in the transport direction.

  The size of the gap is such that a corona discharge is generated when the molded article sheet 10 charged with static electricity passes below the ground potential removing brush 4. The air near the neutralization brush 4 is electrically decomposed by the corona discharge, and ions are generated. The generated ions can electrically neutralize the static electricity of the molded product sheet 10 having the opposite polarity.

  Next, the moving table 1 starts moving in the transport direction from the initial position to the cutting position. FIG. 1C shows a state during the movement from the initial position to the cutting position. As the moving table 1 moves from the initial position to the cutting position, the molded product sheet 10 passes below the stationary static elimination brush 4 to remove static electricity.

  FIG. 1D shows a state where the moving table 1 has reached the cutting position. At the cutting position, the static electricity removal of the molded product sheet 10 is completed.

  FIG. 1E shows a state in which the charge removing brush 4 has risen from the approach position to the initial position.

  FIG. 2A shows a state where the platen 2 is lowered toward the moving table 1 and cut. The molded product sheet 10 is cut into a plastic container 11 and a remaining cut portion 12. At the same time as the cutting, the platen 2 sucks air on the bottom side of the platen 2 and the plastic container 11 is adsorbed on the bottom side of the platen 2.

  Next, as shown in FIG. 2B, the platen 2 rises while adsorbing the plastic container 11, and the moving table 1 returns from the cutting position to the initial position with the remaining uncut portion 12 placed thereon. Has become.

  When the uncut remaining portion 12 of the moving table 1 is removed and the plastic molded product sheet 10 is placed at a predetermined position on the moving table 1 again at the initial position of the moving table 1, the process returns to FIG.

  By repeating the steps shown in FIGS. 1 and 2, static electricity can be removed each time the molded plastic sheet 10 is transported.

  3 to 5 show steps until the cut plastic container is placed on the placing means. 3 to 5 illustrate the platen 2, the lifter conveyor 3, and the neutralization brushes 5 and 6.

  The platen 2 is a transport unit that reciprocates the plastic container 11 that is the transported object in the transport direction.

  The lifter conveyor 3 is a mounting means provided vertically below the platen 2 at the mounting position so as to be vertically movable.

  The static elimination brush 5 is a static elimination means that reciprocates along the transport direction integrally with the platen 2 as the transport means and is accessible to the lifter conveyor 3 as the mounting means. The discharging brush 5 is electrically connected to the ground potential.

  The static elimination brush 6 is a static elimination means which is accessible from below to the reciprocating platen 2. The charge removing brush 6 is electrically connected to the ground potential.

  At the initial position of the platen 2 shown in FIG. 3A, the plastic container 11 is in a state of being adsorbed to the bottom surface side of the platen 2. On the lifter conveyor 3, a plurality of plastic containers are stacked and placed in a row 13.

  Next, the lifter conveyor 3 moves up from the initial position shown in FIG. 3A to the standby position shown in FIG. Similarly to the lifter conveyor 3, the neutralization brush 6 also rises from the initial position shown in FIG. 3A to the standby position shown in FIG.

  Next, the neutralization brush 6 moves up from the standby position shown in FIG. 3B to the transported object approaching position shown in FIG. 3D. The transported object approaching position of the neutralization brush 6 is a position where a gap exists between the neutralization brush 6 and the plastic container 11 adsorbed on the platen 2 moving in the transport direction.

  The size of the gap is such that a corona discharge occurs when the plastic container 11 charged with static electricity passes above the neutralizing brush 6 at the ground potential.

  Next, the platen 2 moves in the transport direction from the initial position to the placement position. As shown in FIG. 3D, the static electricity is removed by passing the plastic container 11 above the stationary static elimination brush 6.

  As shown in FIG. 4A, the platen 2 reaches the mounting position. At the mounting position, static electricity removal of the plastic container 11 adsorbed on the platen 2 is completed.

  As shown in FIG. 4B, the lifter conveyor 3 moves up toward the platen 2.

  As shown in FIG. 4 (c), the lifter 3 is raised to a position where the row 13 of the lifter conveyors 3 is pressed against the plastic container 11 adsorbed on the platen 2. In the state shown in FIG. 4C, the air is discharged from the bottom surface side of the platen 2, and the plastic containers 11 are stacked on the row 13 of the lifter conveyor 3.

  As shown in FIG. 4D, the lifter conveyor descends to the standby position again.

  The neutralization brush 6 rises from the transported object approach position shown in FIG. 4D to the transport unit approach position in FIG. 5A. The position at which the discharging brush 6 approaches the transfer means is a position where a gap exists between the discharging brush 6 and the platen 2 which moves in the direction opposite to the transfer direction.

  The size of the gap is such that a corona discharge is generated when the electrostatic platen 2 passes above the neutralizing brush 6 at the ground potential.

  The neutralization brush 5 descends from the standby position shown in FIG. 4D to the placement means approach position shown in FIG. 5A. The position where the mounting means of the neutralization brush 5 is approached is a position where a gap exists between the neutralization brush 5 moving in the direction opposite to the transport direction and the row 13.

  The size of the gap is such that a corona discharge is generated when the static elimination brush 5 at the ground potential passes above the row 13 charged with static electricity.

  The position at which the neutralization brush 5 approaches can be changed according to the height of the row 13 which is the transported object placed on the placing means.

  Next, the platen 2 moves from the mounting position to the initial position in a direction opposite to the transport direction. As shown in FIG. 5B, the platen 2 passes above the stationary static elimination brush 6 to remove static electricity.

  As shown in FIG. 5B, the static elimination brush 5 of the ground potential passes above the row 13 charged with static electricity, and the static electricity is removed.

  As shown in FIG. 5C, the platen 2 returns to the initial position. At the initial position, the static electricity removal of the platen 2 has been completed, and the static electricity removal of the row 13 has been completed.

  As shown in FIG. 5D, the neutralization brush 5 rises from the approaching position of the placing means to the initial position. The neutralizing brush 6 also descends from the transport means approach position to the standby position.

  When the platen 2 adsorbs the cut plastic container 11, the process returns to FIG.

  By repeating the steps of FIG. 3 to FIG. 5, each time the plastic container 11 is transported, the static electricity on the platen 2 and the row 13 can be removed.

  In the above-described embodiment, the case of the cutting machine including the static electricity removing device has been described, but the present invention is not limited to this. The static electricity removing device may be provided in a device or a machine other than the cutting machine that needs to remove static electricity.

  In the above-described embodiment, the case where the transferred object is the plastic molded product sheet 10 has been described, but the present invention is not limited to this. The transported object may be made of a material other than plastic and need to remove static electricity.

  In the above embodiment, as shown in FIG. 1, a description will be given of a case where the plastic molded article sheet 10 to be conveyed has a posture in which the bottom of the cut plastic container 11 is in contact with the moving table 1. However, the present invention is not limited to this. For example, the position of the transferred object on the transfer means is such that the plastic molded article sheet as the transferred object has a posture in which the opening of the plastic container after cutting is in contact with the moving table. It may be changed appropriately according to the process.

  In the above-described embodiment, the case where the static elimination means are the static elimination brushes 4, 5, and 6 has been described. The static elimination means may be a conductive string electrically connected to the ground potential, or a conductive rod electrically connected to the ground potential.

  In the above embodiment, the case in which the charge removing brush 4 serving as the charge removing means rises from the approach position to the initial position in FIG. 1E, but the present invention is not limited to this. The static elimination means may be made to approach a conveyance means or the like moving in a direction opposite to the conveyance direction.

  In the above-described embodiment, the case has been described in which the charge removing brush 5 serving as the charge removing unit reciprocates along the carrying direction integrally with the platen 2 serving as the carrying means. However, the present invention is not limited to this. The static elimination means may move independently of the transport means.

  In the above embodiment, the case has been described in which the static elimination brush 5 as the static elimination means eliminates the electricity from the row 13 placed on the mounting means. However, the present invention is not limited to this. The discharging unit may discharge the mounting unit.

  In the above-described embodiment, the case where the charge removing brushes 4, 5, and 6 serving as the charge removing means approach each other, but the present invention is not limited to this. The static eliminator may be in contact with the transported object, the transporter, or the placement unit.

DESCRIPTION OF SYMBOLS 1 Moving table 2 Platen 3 Lifter conveyor 4 Static elimination brush 5 Static elimination brush 6 Static elimination brush 10 Molded sheet 11 Plastic container 12 Cutting remaining part 13 row

Claims (6)

Transport means for reciprocating along the transport direction to transport the transported object,
A static eliminator comprising: a static eliminator capable of approaching or contacting a reciprocating transport means from above or below, and electrically connected to a ground potential.   The static eliminator according to claim 1, wherein the static eliminator approaches or comes into contact with the transported object when the transporter moves in the transport direction together with the transported object.   The static eliminator according to claim 1, wherein the static eliminator approaches or comes into contact with the transport unit when only the transport unit moves in a direction opposite to the transport direction. Transport means for reciprocating along the transport direction to transport the transported object,
Mounting means on which the transported object transported by the transport means is mounted,
Having a static eliminator electrically accessible to a ground potential, which is capable of approaching or contacting the mounting means;
The static eliminator is characterized in that the static eliminator moves in the direction opposite to the transport direction by approaching or contacting the mounting means or the transported object mounted on the mounting means.   The static eliminator according to claim 4, wherein the static eliminator is capable of changing an approaching position in accordance with the height of the conveyed object placed on the placing unit. It further has another static elimination means which is accessible or accessible to the transport means and is electrically connected to the ground potential,
The static eliminator according to claim 4, wherein the other static eliminator approaches or comes into contact with the transport unit that moves in a direction opposite to the transport direction.

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