JP2001162209A - Coating apparatus of powder coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of evenly coating the entire surface of a can cover with a powder coating. SOLUTION: The coating apparatus of a powder coating is made capable of holding a can cover 4 coated with a coating film 12 on the surface of a panel part 5 and the surface of a taper part 7, sticking a powder coating to the face where the coating 12 of the can cover 4 is formed, and recovering the un-adhering powder coating which does not adhere to the face of the coating film 12 and the coating apparatus is provided with a seal member 31 touching the outer circumferential side of the taper part 7, an inner guide 45 and a casing 17 for supplying the powder coating toward the surface of the taper part 7, a transport tube 65 for supplying the powder coating to the further inner side in the can cover 4 than the supply region of the powder coating by the inner guide and the casing 17, and a passage 45A to recover the un-adhering powder coating which does not adhere to the face coated with the coating film 12 by suction in the center side of the can cover 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a powder coating used for repairing a damaged portion of a coating film formed on the surface of a can lid.

[0002]

2. Description of the Related Art Metal cans filled with contents such as processed foods and drinking water have excellent sealing properties, and therefore have the advantage of maintaining the quality at the time of enclosing the contents for a long time. is there. On the other hand, if the inner surface of the metal can is corroded or the metal elutes due to the components contained in the content, the taste and flavor of the content may be impaired, so the can is usually used. A coating film is formed on the inner surface of the.

[0003] This kind of coating film is generally formed in the form of a metal coil or sheet, which is a raw material for a can body or a can lid. For example, the coating film of the easy-open can lid of the stain ion type will be described. In the state of an aluminum coil which is a material of the can lid, a coating film is formed on at least one surface thereof. Then, while feeding out the aluminum coil, it is continuously pressed to be processed into a predetermined can lid shape, and the score line is carved, rivets for attaching tabs, attaching tabs to the rivets, etc. Various processes are performed. Therefore, various processing tools and instruments such as press dies come into contact with the coating film of the can lid, are pressed, and slide with the metal member. As a result, damage such as abrasion and peeling may occur in the coating film. Therefore, in the case of can lids used for cans filled with highly corrosive contents, liquid paint or synthetic resin powder (powder) is used to repair (repair) damage to the coating film after the can lid is manufactured. ) Additional painting is performed.

[0004] An example of such an apparatus for repairing damage to a coating film is described in JP-A-6-63492. In the apparatus described in this publication, a can lid is held by a workpiece holding chuck of a turret, and the can lid is positioned at a processing station. Further, a cylindrical collecting device facing the coating film of the can lid held by the work holding chuck is arranged. Inside this collection device, a cylindrical nozzle whose diameter is enlarged on the tip side toward the can lid is arranged. Further, an inner conical member is disposed inside the nozzle. Therefore, between the nozzle and the inner conical member is a ring-shaped outlet of the powder coating material, and a collection port is formed in a ring shape on the outer peripheral side of the nozzle.

On the other hand, an outer peripheral groove is formed on the outer periphery of the panel portion of the can lid, and accordingly, the outer peripheral portion of the inner surface of the can lid has
It is a tapered projection whose outer diameter decreases toward the center. Therefore, the outer surface of the convex portion is an inclined surface facing the outer peripheral side of the can lid, and a flange portion for winding is formed outside the inclined surface, and a sealing portion is formed on the inner surface of the flange portion. Compound is attached.

In the apparatus described in the above publication, the charged powder paint is blown out from an outlet, and the powder paint is sprayed on the outer peripheral side of the panel portion to cover the paint film on the can lid and Attached to the peeled part of the coating film. Also,
The non-adhered powder coating material that has not adhered to the coating film and the peeled portion of the coating film, that is, excess powder coating material, is collected through the collection port.

[0007]

In the apparatus described in the above publication, the ring-shaped outlet faces the vicinity of the boundary between the panel portion and the tapered convex portion or a portion slightly inside the tapered convex portion. The powder paint is sprayed obliquely outward to this portion. A collection port for collecting the powder coating material that has not adhered to the inner surface of the can lid is located further outside the ring-shaped outlet, and is opened toward the outer peripheral portion of the panel. For this reason, the powder paint blown out from the blow-out port is blown obliquely outward toward the outer peripheral portion of the panel portion, and then is turned toward the outer peripheral side in a direction away from the inner surface of the can lid, and is directly returned to the collection port. Collected. Therefore, even when the powder paint is supplied to the can lid in a non-contact state, the powder paint that has not adhered to the can lid is sucked and collected on the outer peripheral side of the can lid to avoid leakage to the outside or Can be suppressed.

[0008] However, the slope of the tapered convex portion generated along with the formation of the outer peripheral groove is a so-called shadow portion with respect to the flow direction of the powder coating material. In other words, the inclined surface of the outer periphery of the can lid is located on the outer peripheral side from the blowing position of the powder coating material, and is located at a position deviated from the streamline in the flow direction of the powder coating material. Therefore, the powder coating material is sucked in a direction to be separated from the inclined surface after coming into contact with the surface of the panel portion, and it is difficult to make the powder coating material actively collide with the inclined surface. Powder paint hardly adheres to inclined surfaces. In particular, since the inclined surface is liable to be damaged by the coating film in contact with the mold to form the outer peripheral groove and the flange portion, it is necessary to repair the coating film. Did not sufficiently repair the coating film on the inclined surface. Also, when tightening the can lid,
Since the coating on the inclined surface is easily damaged by the flange portion, it is necessary to form a thick coating beforehand. However, in the conventional apparatus, it was not possible to apply a thick coating to this portion.

Therefore, first, the powder coating is supplied toward the surface of the tapered portion of the can lid, and the non-adhered powder coating not adhered to the surface of the can lid is sucked on the inner peripheral side of the tapered portion. It is also conceivable to collect them. However, when the outer diameter of the can lid is relatively large, the powder coating material is collected before reaching the center side of the can lid, and is less likely to adhere to the inner peripheral side of the tapered portion. Therefore, it is difficult to apply the powder coating uniformly over the entire surface of the can lid.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus for applying a powder paint capable of uniformly applying the powder paint over the entire surface in the radial direction of a can lid. The purpose is.

[0011]

In order to achieve the above object, the invention according to the first aspect of the present invention is to reduce the outer diameter of the disk-shaped panel portion toward the center of the panel portion. The tapered portion inclined as described above is formed continuously, and a can lid having a coating applied over the surface of the panel portion and the surface of the tapered portion is held, and the coating film of the can lid is formed. A powder coating material supplying and adhering the powder coating toward the coated surface, and collecting the non-adhered powder coating that does not adhere to the surface on which the coating film is formed; Member, a first powder paint supply mechanism that supplies powder paint along the inner periphery of the shield member and to the surface side of the tapered portion of the can lid, and a panel of the can lid Second powder coating supply mechanism for supplying the powder coating to the front side of the unit The supplied by the first powder coating material supply mechanism and said second powder paint supply mechanism, and,
A collecting mechanism that sucks and collects the non-adhesive powder coating material that does not adhere to the surface on which the coating film is formed on the center side of the can lid.

According to the first aspect of the present invention, the powder paint supplied by the first powder paint supply mechanism adheres along the inner periphery of the shielding member and on the surface of the tapered portion of the can lid. The powder paint supplied by the second powder paint supply mechanism is supplied to the inner peripheral side of the supply area of the powder paint supplied by the first powder paint supply mechanism and adheres to the area. I do. Then, the non-adhered powder coating material that does not adhere to the surface of the can lid is recovered by the recovery mechanism.

According to a second aspect of the present invention, a tapered portion is formed continuously on the outer periphery of the disk-shaped panel portion so as to decrease the outer diameter toward the center of the panel portion, and
While holding the can lid coated with a coating over the surface of the panel portion and the surface of the tapered portion, powder paint is supplied and adhered to the surface of the can lid where the coating is formed. And, in a powder paint application device for recovering non-adhered powder paint that does not adhere to the surface on which the coating film is formed, a shielding member that contacts an outer peripheral side of the tapered portion, and an inner periphery of the shielding member. Along with, and a powder paint supply mechanism for supplying the powder paint to the surface side of the tapered portion of the can lid, the powder paint supplied to the surface side of the tapered portion by the powder paint supply mechanism, A powder paint guiding mechanism for guiding the surface of the panel along the surface of the can lid, and a powder paint guiding mechanism for guiding the powder paint toward the panel, and on a surface on which the coating film is formed; A collection mechanism that sucks and collects non-adhered powder paint that does not adhere It is characterized in that that example.

According to the second aspect of the present invention, the powder paint supplied by the powder paint supply mechanism adheres along the inner periphery of the shielding member and on the surface of the tapered portion of the can lid.
The powder paint that does not adhere to the surface of the tapered portion is guided to the inner peripheral side of the can lid along the surface of the can lid by the powder paint guiding mechanism, and adheres to the surface of the panel portion of the can lid. Then, the non-adhered powder coating material that does not adhere to the surface of the can lid is recovered by the recovery mechanism.

According to a third aspect of the present invention, in addition to the first or second aspect, the can lid is made of a metal material, and the powder coating material is supplied to the can lid side in a charged state. And the holding device includes a suction mechanism for vacuum-suctioning and holding the can lid, and a grounding mechanism for electrically grounding the can lid held by the suction mechanism. It is characterized by the following.

According to the third aspect of the present invention, in addition to the same effect as the first or second aspect of the present invention, the charged powder is applied to the surface of the can lid held by the suction force of the holding device. The paint is electrostatically deposited. Here, the electric charge of the powder paint adhering to the surface of the can lid is removed by the grounding mechanism. Therefore, repulsion between the powder paint previously attached to the can lid and the charged powder paint supplied later is suppressed, and the adhesion efficiency of the powder paint to the can lid is improved. .

[0017]

Next, an embodiment of the present invention will be described. FIG. 1 is a partial cross-sectional view of a powder coating device (hereinafter simply referred to as a coating device) 1 according to the present invention, and FIG. 2 is a cross-sectional view showing a schematic overall configuration of the device. . The coating apparatus 1 shown here includes a rotatable disk-shaped turret 2. The turret 2 is intermittently rotated in a predetermined direction by a driving mechanism (not shown) such as an index. A plurality of holding chucks 3 are provided on the outer periphery of the turret 2 at predetermined intervals in the circumferential direction.

FIG. 3 is a sectional view showing a state in which the holding chuck 3 holds the can lid 4. The holding chuck 3 is made of a non-conductive material, for example, a plastic such as Teflon (trade name of DuPont's tetrafluoroethylene resin), nylon or the like. The holding chuck 3 has a cylindrical portion 50,
And an outward flange 51 formed at one end of the cylindrical portion 50. The cylindrical portion 50 is attached to a mounting hole (not shown) on the outer periphery of the turret 2. Cylindrical part 50
Is formed with a holding hole 52 in the axial direction, and a cylindrical bush 53 is inserted into the holding hole 52. The bush 53 is made of a conductive material, for example, brass.

Outward flange 51 of bush 53
A disk-shaped neutralization plate 55 is attached to the end on the side with a screw member 56. This static elimination plate 55
Is made of a conductive material, for example, a thin metal plate or the like to which conductive fibers (Celmec; trade name) are adhered, and a substantially circular region on the surface of the static elimination plate 55 on the side of the can lid 4 has conductive property. Many fibers (not shown) are planted in an upright state. In addition, the static elimination plate 55
And the outward flange 51 are in contact with each other. Further, the static elimination plate 55 has a through hole 55A for suction (vacuum).
Are formed.

The bush 53 has an intake path 57 and a holding hole 58 formed therein. The intake path 57 is provided between the outward flange 51 and the static elimination plate 55 through the through hole 5.
5A. The intake path 57 is opened facing the static elimination plate 55, and the intake path 57 and the holding hole 58 are formed on the same axis (not shown). A cylindrical shaft 59 is fixed to the holding hole 58. Cylindrical part 5
A screw member 54 is screwed into the bush 53 and the bush 53. The screw member 54 allows the relative rotation between the bush 53, the holding chuck 3 and the shaft 59,
And the holding chuck 3 and the shaft 59 are prevented from moving relative to each other in the axial direction.

The shaft 59 is made of a conductive material, for example, iron, brass, aluminum or the like. An intake path 60 is formed in the shaft 59, and the intake path 57 and the intake path 60 communicate with each other. The intake path 60 is connected to a suction mechanism, for example, a vacuum pump P1. further,
The shaft 59 is grounded via an electric wire 61. On the other hand, the cylindrical portion 50
An annular projection 62 extending in the axial direction is formed. The static elimination plate 55 is arranged inside the projection 62.

The can lid 4 is attached to an opening of a body (not shown) of a can (not shown) for enclosing contents such as processed food or soft drink. And
The can lid 4 has a disk-shaped panel portion 5, an outer peripheral groove 6 formed on the outer periphery of the panel portion 5, and a tapered portion serving as a wall of an outer portion of the outer peripheral groove 6 in a radial direction. 7, and a winding flange portion 8 having an arc-shaped cross section continuing further from the tapered portion 7. That is, as the outer peripheral groove 6 is formed, the portion is convex toward the inner surface side of the can lid 4, and the outer surface of the convex portion in the radial direction is the can lid 4.
Has a tapered inclined surface whose outer diameter gradually decreases toward the center.

When the can lid 4 is attached to the body,
In FIG. 1, the left surface of the can lid 4 is the inner surface inside the can, and the right surface of the can lid 4 is the outer surface. A score line (not shown) is engraved on the panel portion 5 and a rivet 9 is formed. A tab 10 is attached to the rivet 9. The can lid 4 is held by the holding chuck 3 with the tab 10 facing the turret 2 side.

In the process of manufacturing the can lid 4,
A coating film is formed on a metal material serving as a material of the can lid 4, for example, a surface of an aluminum coil (a surface corresponding to an inner surface side of the can lid 4). This is done to prevent the metal material from being corroded by the components of the product after the content is filled in a can in a product state, or the metal from being eluted, thereby impairing the taste and flavor of the content. Have been. In the manufacturing process of the can lid 4, the aluminum coil is pressed into a predetermined shape by pressing with a mold or a processing tool, and a score line or a rivet 9 is formed on the can lid 4. Is attached. Further, a coating film 12 is formed on the entire inner surface (left surface in FIG. 1) of the can lid 4, that is, from the inner surface (front surface) 11 of the panel portion 5 to the entire inner surface (front surface) of the flange portion 8. .

Further, a sealing member made of an elastomer, that is, a compound rubber 13 is attached to the inside of the flange portion 8 in the form of a film. When the can lid 4 is attached to the can body, the compound rubber 13 contacts the compound rubber 13 at the inner peripheral end of the body, and when the flange portion 8 is wound around the can body, the compound rubber 13 is connected to the can body. This is for maintaining the sealing between the contact surfaces with the can lid 4.

On the other hand, a paint supply / collection mechanism (hereinafter simply referred to as a mechanism) 14 facing the outer peripheral surface of the turret 2 is provided. The mechanism 14 attaches (applies) a synthetic resin powder (powder) paint to the inner surface side of the can lid 4, and also applies an excess powder paint that does not adhere (does not adhere) to the surface of the can lid 4. It is for collecting. Hereinafter, the configuration of the mechanism 14 will be specifically described.

[0027] The mechanism 14 is a base 1 arranged substantially horizontally.
A cylindrical holder 16 is fixed to an end of the gantry 15 on the turret 2 side. The axis (not shown) of the holder 16 is set substantially horizontal. A cylindrical casing 17 is fixed to the inner periphery of the holder 16. This holder 16
The casing 17 and the casing 17 are arranged on the same axis (not shown).

On the other hand, a powder paint supply head 18 is provided above the gantry 15, and the powder paint supply head 18 has a plurality of powder paint transport tubes 19 (for example, eight to one).
2) are connected. These powder paint transport tubes 19 are arranged on the same circumference around the axis of the casing 17. The plurality of powder paint transport tubes 19 penetrate the inward flange 20 of the casing 17, and the tips of the powder paint transport tubes 19 reach the inside of the casing 17. A cylindrical member 21 is provided on the inner periphery of the casing 17, and the cylindrical member 21 holds the distal end of the powder paint transport tube 19. A plurality of supply paths 23 are formed in the cylindrical member 21 so as to extend in the axial direction. The open ends of the plurality of powder paint transport tubes 19 are open to the respective supply paths 23.

A ring-shaped bracket 24 is provided on the outer periphery of the casing 17. This bracket 24
, Three air cylinders 25 are attached. The air cylinder 25 outside the casing 17
At a position closer to the turret 2, an annular slide guide 26 is disposed. This slide guide 26
Is configured to be relatively movable in the longitudinal direction with respect to the casing 17. Each of the air cylinders 25 has a rod 27, and these rods 27 are connected to a slide guide 26. Each rod 27 is movable in a direction parallel to the axis of the casing 17, that is, in a direction approaching / separating from the turret 2. Therefore, the slide guide 26 moves in the left-right direction in FIG. 2 by the operation of the air cylinder 25.

At the end of the outer periphery of the casing 17 on the turret 2 side, a cylindrical masking guide 28 is provided.
Is attached. The masking guide 28 is integrally formed of a plastic material (insulating material). The masking guide 28 includes a cylindrical portion 29 and a tapered portion 30 connected to an end of the cylindrical portion 29 on the turret 2 side.
And The masking guide 28 is attached to the outer peripheral surface of the casing 17 together with (integral with) the slide guide 17 so as to be relatively movable in the longitudinal direction. The cylindrical portion 29 of the masking guide 28 and the slide guide 26 are connected by a bearing. As shown in FIG. 1, the tapered portion 30 of the masking guide 28 has a shape whose diameter gradually decreases as the distance from the casing 17 increases.

An annular seal member 31 is fixed to the tip of the tapered portion 30. This sealing member 31
By contacting the tip with the vicinity of the inner peripheral edge of the compound rubber 13, the internal space and the external space of the masking guide 28 are shut off, so that the powder paint adheres to the compound rubber 13, It functions as a shielding member for preventing leakage to the outside.

Further, the cross-sectional shape of the seal member 31 on the distal end side is formed in a substantially arc shape, and when the seal member 31 comes into contact with the boundary portion, the contact surface pressure per unit area is increased as much as possible. It is configured as follows. Examples of the material of the seal member 31 include elastomers such as fluorine rubber and silicone rubber, and the rubber hardness of the seal member 31 is set to 50 ° to 90 °.

On the other hand, a motor 32 is arranged outside the casing 17, and a rotating shaft 33 is arranged in parallel with the axis of the casing 17. Motor 3
A belt 35 is wound around the output shaft 34 of the second shaft 2, and the belt 35 is
Is wrapped around. The rotating shaft 33 can reciprocate in the longitudinal direction.

A friction roller 37 is attached to the rotating shaft 33.
7 and the outer peripheral surface of the cylindrical portion 29 of the masking guide 28 are in contact with each other. Therefore, when the motor 32 is driven, the belt 35 and the pulley 36 and the rotating shaft 3
3 Further, the masking guide 28 rotates about the axis X1 via the friction roller 37.

Further, a groove cam 38 is attached to the rotating shaft 33, and an annular groove 39 is formed in the groove cam 38. On the other hand, a cam follower (cam roll) 40 is connected to a part of the outer periphery of the slide guide 26, and the cam follower 40 is engaged with the annular groove 39.
Therefore, the cam follower 40 and the groove cam 38 can be relatively rotated. When the slide guide 26 moves in the axial direction, this moving force is transmitted to the rotation shaft 33 via the cam follower 40. That is, the slide guide 26 and the rotating shaft 33 move integrally in the axial direction.

A bearing 41 is attached to the tip of each rod 27. The bearing 41 is a radial bearing, and an inner ring (not shown) of the bearing 41 is fitted on the outer periphery of the rod 27. Further, a flange 43 is formed on the outer peripheral surface of the outer ring 42 of the bearing 41. On the other hand, an annular groove 44 is formed on the outer periphery of the cylindrical portion 29 of the masking guide 28,
The flange 43 is arranged to be rollable with respect to the annular groove 44. That is, the masking guide 28 is supported by the three bearings 41, and when the masking guide 28 rotates, the masking guide 28, the outer ring 42, and the flange 43 rotate relatively.

On the other hand, at the end of the cylindrical member 21 on the masking guide 28 side, a cylindrical inner guide 45 is provided.
Is attached. That is, the inner guide 45 is provided in the casing 17. The supply path C1 is formed between the inner guide 45 and the casing 17. The supply path C1 and the supply path 23 communicate with each other. In addition, the outer peripheral surface 63 of the inner guide 45 is provided with a taper in a direction of increasing the diameter as approaching the masking guide 28, and the tip of the inner guide 45 reaches the inside of the tapered portion 30. further,
The inner guide 45 is formed with a suction path 45A centered on the axis X1. The inner peripheral surface 64 facing the suction path 45A is provided with a taper in a direction of increasing the diameter as approaching the masking guide 28. The maximum outer diameter of the inner guide 45 can be set to, for example, about 69 mm.

The outer peripheral surface 63 of the inner guide 45
There are provided a plurality of transport tubes 65 that form a bypass passage that penetrates from the inside toward the inner peripheral surface 64. That is,
One end of each transport tube 65 is disposed between the inner peripheral surface 17A of the slide guide 17 and the outer peripheral surface 63 of the inner guide 45, and the other end of each transport tube 65 is connected to the tapered portion 30 of the masking guide 28. Inside the taper section 30
It is arranged on the near side of the tip of. The end of the transport tube 65 on the side of the can lid 4 is closer to the inner guide 4 than the end of the slide guide 17 on the side of the inner peripheral surface 17A.
5 is attached to the inner guide 45 at a position inclined by a predetermined angle with respect to the axis X1 so as to be located near the axis X1. In addition, six to ten transport tubes 65 are arranged on the same circumference of the inner guide 45, and the inner diameter of each transport tube 65 is set to 4 mm to 6 mm.

A suction pipe 47 is provided on the inner periphery of the cylindrical member 21.
Is attached, and the suction pipe 47 and the inner guide 4
5 are connected. The suction pipe 47 is connected to a suction mechanism, for example, a vacuum pump P2. The minimum inner diameter of the inner guide 45 and the inner diameter of the suction pipe 47 can be set to, for example, 30 mm.

Here, the correspondence between the configuration of FIGS. 1 to 3 and the configuration of the present invention will be described.
8 and the sealing member 31 correspond to the shielding member of the present invention, and include the powder paint transport tube 19, the supply path 23, the casing 17, the inner guide 45, the masking guide 28,
The supply path C1 corresponds to the first powder paint supply mechanism of the present invention, each transport tube 65 corresponds to the second powder paint supply mechanism of the present invention, and the suction pipe 47 and the vacuum pump P2 of the present invention. The holding chuck 3, the suction path 57,
60, the vacuum pump P1 corresponds to the suction mechanism of the present invention,
The electric wire 61 corresponds to the grounding mechanism of the present invention.

Next, the operation of the coating apparatus 1 will be described. First, the can lid 4 is held by the holding chuck 3.
Specifically, the vacuum pump P1 is driven to drive the through hole 55
A, the can lid 4 is held by the holding chuck 3 in a state where the outer peripheral groove 6 of the can lid 4 and the projection 62 of the holding chuck 3 are in contact with each other by vacuum suction through the suction paths 57 and 60. When the can lid 4 is held by the holding chuck 3, the tips of a large number of conductive fibers planted on the static elimination plate 55 contact one surface of the can lid 4 panel portion 5.

When the turret 2 rotates and the can lid 4 is supplied to the coating position A1, the turret 2 stops. Specifically, the can lid 4 is intermittently supplied to the application position A1 at a speed of about 300 sheets per minute. When the can lid 4 is supplied to the application position, the turret 2 stops for a time of about 120 msec.

On the other hand, on the mechanism 14, when the can lid 4 is not supplied to the coating position A1, the rod 27 of the air cylinder 25 is stopped at the retracted position.
The motor 32 is rotating. Then, when the can lid 4 is supplied to the application position A1 and the turret 2 stops, the rod 27 moves forward by the operation of the air cylinder 25.
Then, the slide guide 26 and the masking guide 2
8 moves integrally to the can lid 4 side, and the tip of the sealing member 31 contacts the inner surface of the can lid 4 as shown in FIG. The contact position is, as described above, the compound rubber 13.
In the vicinity of the inner periphery. Therefore, the compound rubber 13 is shielded from the supply space of the powder paint.

As described above, when the rod 27 advances, the moving force is transmitted to the rotating shaft 3 via the cam follower 40.
3 is transmitted. Therefore, the rotation shaft 33 and the friction roller 37 also move in a direction approaching the turret 2. Here, although the motor 32 is fixedly installed, even when the rotating shaft 33 moves in the axial direction,
The movement of the rotating shaft 33 is absorbed by the bending of the belt 35. Therefore, the moving force of the rotating shaft 33 is not transmitted to the motor 32.

The powder coating made of synthetic resin is charged by friction charging or corona discharge by a charging mechanism (not shown), and is supplied to the powder coating transport tube 19. The powder coating is supplied to the annular supply path C1 between the casing 17 and the inner guide 45 via the supply path 23. Then, a part of the powder coating material supplied to the supply passage C1 passes through the gap D1 between the tapered portion 30 of the masking guide 28 and the tip of the inner guide 45 as shown by the arrow in FIG. The powder paint is supplied toward a region corresponding to the surface (inclined surface) of the tapered portion 7 of the lid 4, and the powder paint is electrostatically attached to the surface of the tapered portion 7. In addition, supply path C
As shown by arrows in FIG. 1, a part of the powder coating material supplied to the area 1 inside the tapered section 7 of the can lid 4 via each transport tube 65, specifically, the panel section 5 side And the powder paint is electrostatically adhered to the surface of the panel section 5.

On the other hand, when the vacuum pump P2 connected to the suction pipe 47 is driven, air flows from the distal end of the inner guide 45 in the direction along the suction pipe 47 side. For this reason, the powder paint that has not adhered to the surface of the tapered portion 7 moves to the inner peripheral side of the can lid 4, that is, to the panel portion 5 along with the flow of the air, and the powder paint also adheres to the surface of the panel portion 5. Body paint adheres. In this way, the powder coating material supplied to the surface side of the tapered portion 7 via the gap D1 and each transport tube 6
Of the powder paint supplied to the front surface side of the panel section 5 via the pipe 5, surplus powder paint (non-adhered powder paint) that has not adhered to the surface of the can lid 4 is removed by the suction passage 45 </ b> A and the suction passage 45 </ b> A. Tube 47
Collected via

When the operation of adhering the powder coating material to the can lid 4 is started, the motor 32 is constantly driven, and as a result, the masking guide 28 is also constantly rotating. On the other hand, the can lid 4 stops at the application position A <b> 1 and contacts the seal member 31 while rotating at the same speed as the masking guide 28 integrally with the holding chuck 3. That is, while the can lid 4 and the masking guide 28 rotate together, the powder paint adheres to the inner surface of the can lid 4, thereby preventing the applied amount of the powder paint from being biased. Since the masking guide 28 and the can lid 4 come into contact with each other while rotating at the same speed, there is no damage due to frictional contact at all, and there is no rotation unevenness of the can lid 4. Disappears.

When a predetermined time has elapsed since the start of the operation of applying the powder paint, the supply of the powder paint from the powder paint transport tube 19 is stopped, and the vacuum pump P2
The collection of the surplus powder coating material by the suction is ended. Thereafter, the rod 27 is retracted by the operation of the air cylinder 25 and stops at a predetermined position. During the above operation, 80 to 100 msec out of 120 msec during which the turret 2 is stopped
During this period, the supply and application of the powder coating are performed, and the advancing / retreating operation of the masking guide 28 is performed during the remaining 40 to 20 msec.

When the application operation of the powder coating material is completed as described above, the turret 2 rotates in a predetermined direction and stops, and the same operation as described above is repeated. The can lid 4 to which the powder coating has been applied is conveyed to a subsequent step and heated, where the powder coating is melted and fused to the inner surface of the can lid 4 to form a coating 12
Repair of the damaged part is completed.

As described above, according to this embodiment, a part of the powder paint supplied from the powder paint transport tube 19 is guided to the inner peripheral side along the tapered portion 30 of the masking guide 28, This powder paint is positively supplied to the region corresponding to the tapered portion 7. Therefore, the powder coating can be reliably adhered to the tapered portion 7, and the coating 12 in the area can be surely repaired.

The powder coating material supplied to the tapered portion 7 is guided to the inner peripheral side of the can lid 4 by air flow and adheres to the surface of the panel portion 5. If the outer diameter of the can lid 4 is set to 65 mm or more (specifically, about 80 mm), excess powder paint that has not adhered to the panel portion 7 will be removed from the surface of the panel portion 5. Before reaching the side, it may be collected via the suction path 45A. However, in this embodiment, a part of the powder paint supplied from the powder paint transport tube 19 is supplied to the front side of the panel portion 5 of the can lid 4 via each transport tube 65. Therefore, even when the outer diameter of the can lid 4 is relatively large, over the entire area of the can lid 4 in the radial direction,
The powder coating can be uniformly and evenly applied. In other words, even if the supply amount of the powder paint is small,
The powder coating can be reliably adhered over the entire surface of the can lid 4, and the coating efficiency of the powder coating is improved.

Further, since the inner diameter of each transport tube 65 is set to 4 mm to 6 mm, the relative relationship between the inner diameter of each transport tube 65 and the gap D1 causes the transport tube 65 to pass through the transport tube 65 to the panel section 5 side. The ratio between the amount of the supplied powder paint and the amount of the powder paint supplied to the tapered portion 7 via the gap D1 becomes an appropriate value. Therefore, the thickness of the powder coating applied to the tapered portion 7 of the can lid 4 and the thickness of the powder coating applied to the panel portion 5 become substantially uniform.

Further, when the can lid 4 is held by the holding chuck 3, the can lid 4 is grounded via the charge removing plate 55, the bush 53, the shaft 59, and the electric wire 61. For this reason, the charge of the powder paint adhered to the can lid 4 is removed, and the powder paint previously adhered to the can lid 4 and the powder paint supplied thereafter may repel each other. Is suppressed. Accordingly, the efficiency of applying the powder coating to the can lid 4 is improved, and the powder coating can be applied uniformly over the entire surface of the can lid 4.

Here, since the conductive fibers of the static elimination plate 55 are brought into contact with the entire area of the panel portion 5 of the can lid 4, the static elimination area is widened and the static elimination efficiency is increased by about 98%.
To some extent. Incidentally, when the plate-shaped static elimination plate having no conductive fiber was brought into surface contact with the can lid, the static elimination efficiency was measured to be about 50 to 90%.

Further, since the tips of the conductive fibers of the charge eliminating plate 55 are in contact with the surface of the can lid 4 (in other words, having an infinite number of discharge tips), the electric resistance is low, and the charge eliminating efficiency is further improved. Since the amount of corona discharge per conductive fiber is very small, there is no danger of igniting or exploding a flammable substance in the process, and it is safe.
In addition, since the conductive fibers are thin and light, the attachment and handleability when attaching the charge removing plate 55 to the holding chuck 3 are good.

FIG. 4 is a partial sectional view showing another embodiment of the present invention. In FIG. 4, the inner guide 45
Has a first outer peripheral surface 66 and a second outer peripheral surface 67 connected to the first outer peripheral surface 66. In particular,
A first outer peripheral surface 66 is arranged on the casing 17 side, and a second outer peripheral surface 67 is arranged on the masking guide 28 side. The first outer peripheral surface 66 is provided with a taper in a direction in which the diameter increases as approaching the masking guide 28,
The outer peripheral surface 67 is provided with a taper in a direction of reducing the diameter as the distance from the first outer peripheral surface 66 increases.

Further, a guide surface 68 as an end surface substantially perpendicular to the axis X1 of the inner guide 45 is connected to the second outer peripheral surface 67. A passage F1 is provided between the guide surface 68 and the inner surface of the can lid 4 held by the holding chuck 3.
Is formed. The suction path 69 of the inner guide 45
Is set substantially constant in the axial direction. This suction path 69 is connected to the vacuum pump P2. The other configuration in FIG. 4 is the same as the configuration in FIG. 1 and FIG. 2, and thus the same reference numerals as in FIG. 1 and FIG. The guide surface 68 and the passage F1 in FIG. 4 correspond to the powder paint guide mechanism of the present invention.

In the embodiment shown in FIG. 4, the powder paint supplied via the supply path C1 passes through the gap E1 between the second outer peripheral surface 67 and the tapered portion 30 to form the tapered portion of the can lid 4. 7
And a part of the powder coating is supplied to the tapered portion 7.
Electrostatically adhered to the surface of On the other hand, since the air on the suction passage 69 side is sucked by the driving of the vacuum pump P2,
From near the surface side of the tapered portion 7, the suction path 6
A flow of air toward the ninth side is generated.

For this reason, the non-adhered powder paint that has not adhered to the tapered portion 7 moves to the passage F1 side by the airflow, that is, moves along the surface of the can lid 4, and the powder paint is removed. The part adheres to the surface of the panel part 5. And
The powder paint that has not adhered to the panel unit 5 is collected through the suction path 69.

As described above, in the embodiment of FIG.
The powder paint is first supplied to the surface of the panel portion 7 through the gap E1 and adheres to the surface of the panel portion 7, and then, the non-adhered powder paint passes through the passage F1 to the inner peripheral side of the can lid 4. Is configured to be supplied. Therefore, the powder paint can be uniformly and uniformly applied electrostatically over the entire area of the can lid 4 in the radial direction, and the powder paint adhesion efficiency is improved.

[0061]

As described above, according to the first aspect of the present invention, the powder paint supplied by the first powder paint supply mechanism adheres to the surface of the tapered portion of the can lid,
The powder paint supplied by the powder paint supply mechanism of the first
Is supplied to the inner peripheral side of the supply region of the powder paint supplied by the powder paint supply mechanism, and adheres to the region. Then, the non-adhesive powder coating that does not adhere to (do not adhere to) the surface of the can lid is recovered by the recovery mechanism. Therefore, the powder coating can be applied uniformly and evenly over the entire area in the radial direction of the can lid, and the application efficiency is improved.

According to the second aspect of the present invention, the powder coating material supplied by the powder coating supply mechanism adheres to the surface of the tapered portion of the can lid and does not adhere to the surface of the tapered portion. The powder paint is guided to the center side of the can lid along the surface of the can lid by the powder paint guiding mechanism, and adheres to the surface of the panel portion of the can lid. Then, the non-adhered powder coating material that does not adhere to the surface of the can lid is recovered by the recovery mechanism. Therefore, the powder coating can be applied uniformly and evenly over the entire area in the radial direction of the can lid, and the application efficiency is improved.

According to the third aspect of the present invention, in addition to obtaining the same effects as the first or second aspect of the present invention, the charged powder is applied to the surface of the can lid held by the suction force of the holding device. Body paint is electrostatically deposited. Here, the electric charge of the powder paint adhering to the surface of the can lid is removed by the grounding mechanism. Therefore, repulsion between the powder paint previously attached to the can lid and the charged powder paint supplied later is suppressed, and the adhesion efficiency of the powder paint to the can lid is improved. . Therefore, the powder coating can be applied uniformly and evenly over the entire area in the radial direction of the can lid.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a powder coating device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating an entire configuration of a powder coating device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a main part of a powder paint application device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a main part of a powder coating device according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coating device 3 ... Holding chuck 4 ... Can lid 5
... panel, 7 ... taper, 17 ... casing,
19: powder paint transport tube, 23: supply path, 28
... Masking guide, 31 ... Seal member, 45 ... Inner guide, 45A ... Suction path, 47 ... Suction tube, 5
7, 60: intake path, 61: electric wire, 65: transport tube, 68: guide surface, C1: supply path, F1: passage,
P1, P2 ... Vacuum pump.

Claims (3)

[Claims] 1. A tapered portion which is continuously formed on an outer periphery of a disk-shaped panel portion so as to decrease an outer diameter toward a center portion of the panel portion. While holding the can lid coated with a coating over the surface of the tapered portion, supplying and adhering powder paint toward the surface of the can lid where the coating is formed, and the coating film A powder coating device for collecting non-adhered powder coating that does not adhere to the surface on which is formed, a shielding member contacting an outer peripheral side of the tapered portion, and an inner periphery of the shielding member, and the can A first powder paint supply mechanism for supplying the powder paint to the surface of the tapered portion of the lid; and a second powder paint supply mechanism for supplying the powder paint to the surface of the panel portion of the can lid.
And a non-adhesive powder paint that is supplied by the first powder paint supply mechanism and the second powder paint supply mechanism and does not adhere to the surface on which the coating film is formed. And a collecting mechanism for sucking and collecting at the center side of the can lid. 2. An outer periphery of a disk-shaped panel portion is continuously formed with a tapered portion inclined so that an outer diameter decreases toward a center portion of the panel portion. While holding the can lid coated with a coating over the surface of the tapered portion, supplying and adhering powder paint toward the surface of the can lid where the coating is formed, and the coating film A powder coating device for collecting non-adhered powder coating that does not adhere to the surface on which is formed, a shielding member contacting an outer peripheral side of the tapered portion, and an inner periphery of the shielding member, and the can A powder paint supply mechanism for supplying the powder paint to the surface side of the tapered portion of the lid; and a powder paint supplied to the surface side of the tapered portion by the powder paint supply mechanism, onto the surface of the can lid. A powder paint guiding mechanism for guiding the surface along the surface of the panel section along the And a collection mechanism that sucks and collects non-adhered powder paint that is guided to the panel portion side by a powder paint guide mechanism and does not adhere to the surface on which the coating film is formed. Powder coating equipment. 3. The can lid is made of a metal material, and the powder paint is configured to be supplied to the can lid side in a charged state. The powder paint according to claim 1 or 2, further comprising: a suction mechanism that holds by vacuum suction; and a grounding mechanism that electrically grounds the can lid held by the suction mechanism. Coating equipment.