JP4461922B2 - Spray coating system and masking jig - Google Patents

Description

  The present invention relates to a spray coating system and a masking jig used in the spray coating system, and in particular, a continuous spray coating can be realized with a predetermined number of masking jigs. TECHNICAL FIELD The present invention relates to a spray coating system and a masking jig that can finish a parting of an object clearly.

  A masking jig is generally used when spray coating of a predetermined shape is performed on a painted surface of a workpiece such as a workpiece. For example, in the case of a film-like workpiece, a plurality of masking jigs are placed on the film coating surface during continuous conveyance of the workpiece, and after the spray coating is applied, the masking jig is removed from the film coating surface. It will be dried.

  For example, when a masking jig is placed on a film-like workpiece coating surface and spray coating is performed, one problem is that the parting between the coating area and the masking area in a masking jig having a coating area of a predetermined shape is a problem. However, it is unclear due to the spray sneaking around the masking jig. Another thing is that when the masking jig is not sufficiently fixed to the workpiece coating surface, the masking jig is displaced and the desired portion is not coated. In particular, in order to realize continuous coating like a film workpiece, even if the degree of fixing of the masking jig to the workpiece coating surface is too strong, removal of the masking jig after painting will not be performed efficiently, It is also an important factor that it can be easily removed. Furthermore, when spray coating is performed on a series of production lines, a large number of masking jigs are required, resulting in high costs required for spray coating.

Among the problems described above, Patent Document 1 discloses an invention relating to a coating apparatus in which cleaning means is provided in a rotation path of a masking jig in order to eliminate the use of many masking jigs during spray coating. ing. By using such a coating apparatus, it is possible to realize continuous coating on a workpiece by using only a predetermined number of masking jigs.
Further, Patent Document 2 discloses an invention relating to a coating apparatus for powder coating. According to such a coating apparatus, after the paint adhering to the masking jig is blown off by air blow, the masking jig is reused. It can be used.

  Patent Document 3 discloses an invention relating to a liquid coating apparatus in which a thin film and a masking belt, which are objects to be coated, placed on a conveyor belt do not move on the conveyor belt. That is, a negative pressure chamber is formed by the plurality of convex portions provided on the support base and the conveying belt thereon, and the negative pressure chamber is made negative pressure through the pores provided in the conveying belt. Thus, the thin film and the masking belt on the conveying belt are suction-fixed.

  Patent Document 4 discloses an invention relating to a liquid coating apparatus that can coat a desired position of a thin film by moving the position of a masking plate according to the position of the thin film. The masking plate is controlled in conjunction with the thin film position detection sensor, and moves according to the detection result of the sensor.

Japanese Utility Model Publication No. 64-12671 Japanese Patent Laid-Open No. 11-253848 JP 2001-70863 A JP 2002-166215 A

  According to the coating apparatus of Patent Document 1, it is possible to realize continuous coating on a workpiece by using only a predetermined number of masking jigs by the cleaning means provided in the rotation path of the masking jig. However, such a coating apparatus is intended for a case where the workpiece is a single item. The single-piece workpiece loaded from the carry-in conveyor is placed on a rotatable table, and the painted workpiece is placed on the carry-out conveyor. This is a configuration in which this is performed by a manipulator. For example, it is considered that it is not possible to cope with a case where continuous coating is performed on a film-like workpiece coating surface. Therefore, in such an apparatus, it is extremely difficult to clearly finish the parting between the coating region and the masking region when coating the film-like workpiece coating surface.

  Moreover, according to the coating apparatus of patent document 2, it becomes possible to reuse this masking jig, after the coating material adhering to the masking jig is blown off by air blow. However, regarding the reuse of the masking jig, the flow from the recovery of the masking jig after painting to the cleaning and reuse in the production line is unclear. If it is used, it is considered difficult to realize an efficient flow of the production line, especially the painting line, and there is a concern about a decrease in yield. Further, even in such a coating apparatus, it is considered difficult for the clear finish of the parting between the coating region and the masking region.

  Further, according to the coating apparatus of Patent Document 3, since the thin film and the masking belt are sucked and fixed by the negative pressure chamber formed under the conveying belt below the thin film, the thin film and the masking belt are securely attached when coating the thin film. Can be fixed. However, the negative pressure chamber is formed by forming a large number of convex portions on the support base, the necessity of negative pressure control to maintain an appropriate negative pressure state, and facilities for negative pressure formation and negative pressure control. There are problems such as high manufacturing costs of the apparatus in the painting process, and troublesome work such as negative pressure management. Furthermore, the cleaning of the masking belt is considered to be extremely difficult in view of the disclosed configuration, and there is a high possibility that coating deposits accumulate on the masking belt. There is a concern about the decrease in the sharpness of parting off.

  Furthermore, according to the liquid coating apparatus of Patent Document 4, since the masking plate can be moved to an appropriate position according to the position of the thin film, it is possible to coat the desired position of the thin film. However, since the masking plate is configured to be interlocked with the thin film position detection sensor, there is a problem that the manufacturing cost of the coating apparatus increases. Further, in the liquid coating apparatus as well as the coating apparatus disclosed in Patent Document 3, it is difficult to clean the masking plate due to its configuration, and therefore there is a concern about the quality of the coating.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a spray coating system that can reduce the number of masking jigs used in a coating process as much as possible. Another object of the present invention is to provide a masking jig and a spray coating system that can reliably place the masking jig at a desired position on the surface of the sheet-like workpiece coating surface, and the masking jig does not deviate from the initial placement position. To do. It is another object of the present invention to provide a spray coating system and a masking jig capable of sharply finishing the boundary between the coating region and the masking region of the workpiece.

  In order to achieve the above object, a spray coating system according to the present invention comprises a transport means capable of transporting an object to be spray-coated, a placing means capable of placing a masking jig on the painted surface of the object to be coated, A spray coating system comprising: spray coating means; and cleaning means for recovering and cleaning the masking jig after spray coating, wherein the object to be coated is placed on the object to be coated by the placing means by using the masking jig cleaned by the cleaning means. The masking jig can be repeatedly used by placing it on the painted surface.

  In the system described above, the masking jig is placed, for example, at an appropriate interval on the coating surface of the object to be coated which has been conveyed by the conveying means, by means of a masking jig placing means (for example, a manipulator or a manpower equipped with a magnet). When the object to be coated, which is transported with the masking jig placed thereon, is positioned directly below the spray coating means such as a spray coating nozzle or a spray gun, the transport means is temporarily stopped and spray coating is started. Note that it is possible to eliminate the need to stop the conveyor belt by adjusting the size of the coating area and the coating area that can be sprayed at once. When the spray coating is finished, the conveying means is started, and the coated object (part) and the masking jig sprayed with the spray are moved to an appropriate position and then provided in parallel with the conveying belt. It is moved to the cleaning conveyor belt. Similar to the above, such movement can be performed by an appropriate device such as a manipulator equipped with a magnet, or by human power. The cleaning transport belt transports the masking jig so as to return to the direction opposite to the transport direction of the transport means, that is, the direction in which the masking jig has been transported. The masking jig can wash away the coating adhering to it while being transported, and if necessary, can also be dried after washing. The cleaned or dried masking jig is returned to the conveying means by the placing means and reused.

  By using a system that cleans, dries, and reuses used masking jigs, it is possible to achieve continuous spray coating with a very small number of masking jigs, and to reduce costs in the painting line. Can do. Furthermore, by cleaning the masking jig, no deposits of spray coating liquid remain on the masking jig where the boundary between the masking area and the coating area remains, and therefore the boundary between the masking area and the coating area. It is possible to make the parting clear.

  In a preferred embodiment of the spray coating system according to the present invention, the masking jig and the object to be coated have magnetism.

  The masking jig can be manufactured from a magnetic material such as a plastic magnet. For example, when a film-like object is used, the object to be cleaned also has magnetism, so that the masking jig can be directly attracted to the object to be adhered. Accordingly, after the masking jig is placed at an appropriate position on the coating surface of the object to be coated by the placing means described above, the masking jig continues to be placed at the intended placement position without being displaced even when the transport belt is moved. be able to. Furthermore, since the masking jig is attracted to the object to be coated by magnetism, which is an inherent characteristic of the system components (masking jig and object to be coated), the formation of the negative pressure chamber and Since there is no need for negative pressure management control, and because it is attracted by magnetism, the masking jig can be in close contact with the object to be coated with moderate strength, and it can be easily applied with a manipulator after spray coating. Can be removed.

  Further, as a preferred embodiment of the spray coating system according to the present invention, the transport means is capable of moving on a plurality of rotating shaft bodies provided at predetermined intervals in the transport direction of the object to be coated, and on the rotating shaft body. And the rotating shaft and / or the conveyor belt and the masking jig have magnetism.

  For example, when the object to be coated does not have magnetism, the transport belt constituting the transport means and the rotating shaft for moving the transport belt have magnetism, so that a masking jig having magnetism can be obtained. It can be adhered to the object to be coated. Here, the conveyance belt can be manufactured from, for example, magnet rubber. The rotating shaft can be manufactured from an appropriate magnet (material) such as a ferrite magnet or a plastic magnet. In addition, when the structural member of a conveyance means has magnetism, of course, the to-be-coated body conveyed may have magnetism similarly.

  The masking jig according to the present invention is the masking jig used in the spray coating system, and the masking jig includes a first member for imparting a required rigidity to the masking jig, and the first member. And a second member that defines a masking region and a coating region, and the second member is made of an elastic material having magnetism.

  The masking jig includes a plate-shaped first member made of, for example, a steel material or a plastic material, and a second member that is an elastic material bonded to one side surface of the first member. Such an elastic material is a member having appropriate elasticity and magnetism. For example, the desired characteristics can be obtained economically by being manufactured from magnet rubber or the like.

  A 1st member is a member for ensuring the rigidity of the whole masking jig, and the desired shape of a coating area | region can be ensured by manufacturing from the material etc. which are illustrated above. On the other hand, the second member made of an elastic material defines a masking region formed by the masking jig and a coating region having an appropriate coating shape, and securely attaches the masking jig to, for example, a film-shaped object. It is a member for.

  Here, the purpose of using the elastic material is to prevent the gap from being generated in the contact surface between the masking jig and the object to be coated even when there are microscopic irregularities on the surface of the object to be coated. This is to prevent the gap from being generated while the material follows the unevenness. Further, since the elastic material has magnetism, the masking jig is attracted to an appropriate magnetic member (conveying belt, rotating shaft body, object to be coated) provided in the spray coating system. Thus, it is possible to perform coating without shifting from an appropriate position on the object to be coated. In addition, since the elastic material (second member) is bonded to the first member having an appropriate rigidity, the elastic material can ensure its desired shape at least during spray coating, and therefore the desired shape. Can be spray painted.

  Moreover, as a more preferable embodiment of the masking jig according to the present invention, the second member includes a portion that is formed so as to extend from the boundary between the masking region and the coating region toward the connection portion with the first member. It is characterized by being.

  The second member is a member that is bonded to one side surface of the first member (disposed between the first member and the object to be coated at the time of painting) to define a masking region and a coating region. Here, for example, in an embodiment in which a thin elastic material (second member) is bonded to one side surface of a plate-like first member, it is assumed that a coating region is formed outside the outline of the first member. Try it. In this case, the above-mentioned “portion formed from the boundary between the masking region and the coating region toward the connecting portion with the first member” is the coating surface of the object to be coated from the outline of the first member. Means a portion formed so as to gradually spread toward the outside of the outline. As the shape of the end spread, an appropriate shape such as a taper shape, a smooth curved shape, and a shape gradually approaching the painted surface of the flat object can be selected.

  Since the second member is an elastic material, its deformation characteristics allow the second member to be in close contact with the unevenness of the painted surface of the object to be coated (thus preventing the formation of gaps), and thus spray coating. By preventing the spray from sometimes flowing between the object to be coated and the masking jig, the parting between the masking area and the coating area can be made clear. Moreover, when the thick surface of the masking jig intersects the painted surface perpendicularly like the conventional masking jig, it is empirically confirmed that the coating shape is slightly smaller than the desired shape as a spray coating characteristic. ing. From this point of view, for example, a desired shape can be realized by intersecting the painted surface at a non-vertical angle with a portion formed in a tapered shape.

  Furthermore, in another embodiment of the masking jig according to the present invention, the first member is made of a plate material having an opening for forming a coating region, and a portion of the second member that is formed in the divergent portion is the opening. It is formed so that it may surround.

  For example, it is an embodiment in the case of forming a coating region having an appropriate shape such as a circle or a rectangle, and a first member made of a plate material having an opening having the appropriate coating shape is used. In this case, the portion of the second member that is formed so as to extend from the boundary between the masking region and the coating region toward the connecting portion with the first member is formed so as to surround the opening. Glued to. For example, in the case of forming a circular painted region, the first member has a circular opening having a slightly larger diameter than the circular to be painted at the center, and is inclined from the outline of the circular opening toward the center of the circular shape. Desirable is a contour shape in which a second member having such a tapered portion (portion formed in a divergent shape) is bonded to the first member, and the tapered portion is in contact with the painted surface of the object to be coated. It is configured to be a circle having a diameter.

  As can be understood from the above description, according to the spray coating system of the present invention, the masking jig sprayed with the spray is efficiently cleaned and dried and returned to the conveyor belt of the object to be coated. The number of masking jigs used in can be reduced as much as possible. In addition, the cleaning of the masking jig does not leave any deposits of spray coating liquid in the masking jig where the area between the masking area and the painting area is left, so the boundary between the masking area and the painting area is closed. Can also be crisp. Further, according to the spray coating system and the masking jig of the present invention, the masking jig can be continuously placed at a desired position on the coating surface of the object to be coated with an appropriate strength. Furthermore, according to the masking jig of the present invention, the occurrence of a gap between the masking jig and the object to be coated can be prevented, and the parting of the boundary between the masking area and the coating area can be made clear.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a spray coating system of the present invention, and FIG. 2 is an enlarged view of a portion II in FIG. FIGS. 3A and 3B are explanatory views comparing the case of spray coating using the masking jig of the present invention and the conventional masking jig, FIG. 3A is a cross-sectional view taken along the line III-III in FIG. 2, and FIG. Each section of the jig is shown. Although the illustrated masking jig is an embodiment having a rectangular opening at the center of the plate material, the shape of the masking jig and the shape of the opening are not limited to the embodiment. is there. In addition, when recovering the masking jig from the conveyor belt and when returning the masking jig to the conveyor belt after cleaning (or drying), a manipulator with a magnet is used in the figure. It can also be done. Further, the cleaning means can be manually cleaned in addition to the cleaning nozzle as shown.

  As shown in FIG. 1, the spray coating system 1 includes a transport unit 2 that transports the object 7 to be coated, a spray coating unit 4 including a spray pipe and a spray nozzle, a cleaning pipe and a cleaning nozzle 53, and the like. The cleaning device 5 mainly includes a cleaning device 5 and a mounting device 3 for returning the masking jig 6 after cleaning (or after cleaning and drying) to the transport device 2 again. The masking jig 6 to be used includes an elastic body having magnetism as will be described later.

  The conveying means 2 includes a plurality of rotating shaft bodies 21, 21,... Provided at predetermined intervals in the conveying direction, and a conveying belt 22 that rotates and reciprocates by the rotating shaft body 21. The cleaning means 5 includes a manipulator 51 for recovering the coated masking jig 6 (a magnet 52 capable of recovering the masking jig 6 is attached to the tip of the manipulator 51), and a masking jig after recovery. 6 is composed of a rotating shaft 55 and a conveyor belt 54 for conveying 6 and a cleaning nozzle 53 (and a cleaning pipe) for cleaning in the middle of the conveyance. Further, the mounting means 3 is also composed of a manipulator 31 having a magnet 32 attached to the tip thereof as described above.

  FIG. 1 shows an embodiment in which a rectangular spray coating is performed on the surface of a thin film sheet rolled as a body 7 to be coated. 22 moves in the Y direction, and the roll is moved (conveyed) on the conveyor belt 22 in the Y direction while rotating in the X direction as the conveyor belt 22 moves. When the object 7 to be coated has magnetism, the object 7 to be coated and the masking jig 6 can be attracted together, and the masking jig 6 is not displaced even when the conveyor belt 22 is moved. Can continue to be placed in position. In the illustrated embodiment, the rolled object 7 is loosely fitted to a rod body between the receiving legs 23 and 23. When the rectangular spray coating is continuously performed on the surface of the object to be coated 7 being conveyed at a predetermined interval, the masking jigs 6, 6,... Are placed on the surface of the object to be coated 7 at a predetermined interval. . When the object 7 reaches an appropriate position in the middle of conveyance, the spray is discharged from the spray nozzle of the spray coating means 4. When the coating of the coating area is completed and the masking jig 6 is further transported to a predetermined position, the masking jig 6 is recovered from the surface of the object to be coated 7 by a manipulator 51 having a magnet 52 at the tip, and the manipulator 51 It rotates in the direction W in the figure and is placed on the conveyor belt 54. Here, the conveyance belt 54 rotates and reciprocates in the direction opposite to the conveyance belt 22, and the masking jig 6 after being placed is conveyed in the Z direction in the figure. By collecting the masking jig 6, a coating portion 8 having a desired shape (rectangular in the drawing) is formed at a predetermined interval.

  When the masking jig 6 is conveyed in the Z direction and reaches an appropriate position, high-pressure water is discharged from the cleaning nozzle 53 and the spray coating adhering to the surface of the masking jig 6 is washed away. In order to sufficiently wash away the spray coating, it is preferable to clean the adhered spray coating before drying. Accordingly, the moving speed of the conveyor belts 22 and 54 is determined according to the spray drying speed. Although not shown in FIG. 1, a blower or the like for forcibly drying the masking jig 6 after cleaning may be installed.

  After the cleaning (and drying), the masking jig 6 is recovered from the conveyor belt 54 by the manipulator 31 (the magnet 32 provided at the tip of the manipulator 31), and the manipulator 31 rotates in the W direction to transfer the masking jig 6 again to the conveyor belt 22. Place on top.

  By realizing a series of flows of the masking jig 6 as described above, it is possible to perform continuous spray coating only with a predetermined number of masking jigs 6, 6,.

  As described above, the masking jig 6 has magnetism. However, since the masking jig 6 continues to be placed on the conveyor belt 22 without being displaced, the conveyor belt 22 or the rotary shaft 21 attracts the masking jig 6. For this reason, it is preferable that the magnetic material is manufactured. The conveyor belt 22 can be manufactured from magnet rubber or the like, and the rotary shaft 21 can be manufactured from a plastic magnet or the like. However, both the conveyance belt 22 and the rotating shaft 21 may have a magnetic configuration.

  FIG. 2 shows a masking jig 6 of the present invention. The masking jig 6 has a moderate rigidity and includes a first member 61 (plate material 61a) having an opening 61a1 and a second member 62 made of an elastic material bonded to the lower surface of the plate material 61a. The second member 62 is provided with a portion (a portion 621 formed so as to be widened toward the end) that extends in a taper shape from the surface of the body 7 to be bonded to the joint portion with the plate member 61a. The formed portion 621 is formed so as to surround the opening 61a1. A boundary B that defines the coating region P and the masking region M is formed by the portion 621 that is formed so as to spread outwardly. The first member can be made of steel or plastic material, and the second member can be made of magnet rubber or the like.

  Further, as shown in the drawing, incisions 63 and 63 that serve as a positioning reference when placing the masking jig 6 are engraved in the center of the masking jig 6 so that the notches 63 and 63 are coated. It can be placed according to the center line of the body 7.

  Next, based on the explanatory diagram of FIG. 3, the sharpness of the parting of the boundary B between the coating region P and the masking region M when the masking jig 6 of the present invention is used and when the conventional masking jig is used. Compare the differences.

  FIG. 3a shows the case where the masking jig 6 of the present invention is used. Since the masking jig 6 of the present invention includes the second member 62 made of an elastic material on the lower surface of the first member 61 (plate material 61a), for example, a microscopic convex portion U is formed on the painted surface of the object 7 to be coated. Even when the second member 62 is present, the second member 62 can be deformed to absorb the convex portion U, so that the masking jig 6 can be securely adhered to the painted surface. Therefore, the parting of the boundary B can be finished to be extremely clear. Furthermore, since the second member 62 includes a portion 621 that is formed to spread outwardly, the desired shape is more accurate than when the opening inner surface of the masking jig is in contact with the painted surface perpendicularly (the conventional example in FIG. 3b). Spray painting can be realized.

  On the other hand, according to the conventional masking jig shown in FIG. 3b, the masking jig cannot be brought into close contact with the painted surface due to the presence of the convex portion U, whether it is microscopic on the painted surface. Therefore, it is highly possible that the masking jig itself is displaced with the movement of the conveyor belt. Furthermore, as shown in the figure, since the spray coating enters the gap between the masking jig and the coating surface (X direction in the drawing), the boundary between the coating region P and the masking region M is blurred. Therefore, there is a high possibility that the finished quality will be unfavorable.

  As described above, by using the masking jig 6 of the present invention, the coating region P having a desired shape can be secured by the first member 61 having appropriate rigidity, and the coating surface can be finely applied by the second member 62. Even if there are visual irregularities, it can be surely adhered to the painted surface, so that the boundary B between the painted region P and the masking region M can be cut off very clearly. Further, since the second member 62 further has magnetism and can be attracted to the magnetized object 7, the transport belt 22, or the rotary shaft body 21, after being placed after positioning, spray coating is performed. It can continue to be placed at the initial position without being displaced until it is later recovered.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The perspective view which showed schematic structure of the spray coating system of this invention. The enlarged view of the II part of FIG. (A) is explanatory drawing which showed the condition which is performing the spray coating in the III-III arrow cross section of FIG. (B) is a cross-sectional view of a conventional masking jig, and is an explanatory view showing a situation where spray coating is performed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Spray coating system, 2 ... Conveying means, 3 ... Placing means, 4 ... Spray coating means, 5 ... Cleaning means, 6 ... Masking jig, 7 ... Coated object, 21 ... Rotary shaft body, 22 ... Conveying belt, 61 ... first member, 62 ... second member, 61a ... plate material, 61a1 ... opening, 621 ... part formed to spread outward, M ... masking region, P ... painting region, B ... boundary, U ... convex part

Claims (5)

The transport means capable of transporting the object to be coated by spray coating, the placing means capable of placing the masking jig on the painted surface of the object to be coated, the spray coating means, and the masking jig after spray coating are collected. A spray coating system comprising cleaning means for cleaning,
The object to be coated has magnetism, and is continuously conveyed by the conveying means,
The masking jig includes a coating area having a predetermined shape, and includes a member for providing rigidity for ensuring the shape of the coating area, and an elastic material having magnetism, and the object to be coated is continuously conveyed. Is placed on the painted surface of
A spray coating system characterized in that the masking jig cleaned by the cleaning means is placed on the coating surface of the object to be coated by the placing means, whereby the masking jig can be used repeatedly. The transport means includes a plurality of rotating shaft bodies provided at predetermined intervals in the transport direction of the object to be coated, and a transport belt movable on the rotating shaft body. or wherein the conveying belts has magnetism, spray painting system according to claim 1. The masking jig used in the spray coating system according to claim 2 is provided with a first member for imparting a required rigidity to the masking jig, and one side surface of the first member, and a masking region and a coating are provided. A second member defining an area,
The first member is made of a plate material having an opening for configuring the coating region,
The second member may be made of the elastic material having magnetism, masking jig. The said 2nd member is provided with the part currently shape | molded toward the connection part with said 1st member from the boundary of a masking area | region and a coating area | region, The masking of Claim 3 characterized by the above-mentioned. Jigs. 5. The masking jig according to claim 4 , wherein a portion of the second member that is formed to spread toward the end is formed so as to surround the opening. 6.

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