JPH06277581A - Top reciprocation type coating device - Google Patents

Abstract

PURPOSE:To eliminate operation loss and to make the quality of coating films higher and the cost lower by independently and variably moving two pieces of coating machines existing above the object to be coated back and forth according to the coating width of the object to be coated. CONSTITUTION:This coating device is constituted by providing a top reciprocating mechanism with two units of forward and backward moving sections, respectively independently moving two pieces of the coating machines 8 back and forth by means of the respective forward and backward moving sections and increasing or decreasing the forward and backward moving width of the respective coating machines 8 according to the coating width of a vehicle body 1. Then, the respective coating machines 8 are effectively moved back and forth according to the transverse width of the coating surface without deviating from top of the vehicle body 1. As a result, the vehicle body is coated under the stable conditions of spraying coating materials at all times; in addition, the burden of the respective coating machines 8 is decreased by omitting the useless forward and backward movements of the respective coating machines 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top reciprocating type coating apparatus suitable for coating an object to be coated such as automobiles and home electric appliances.

[0002]

2. Description of the Related Art A top reciprocating type coating apparatus for coating a vehicle body of an automobile will be described as an example of a top reciprocating type coating apparatus according to the prior art with reference to FIGS.

In the figure, 1 is a car body of a 1-box type automobile as an object to be coated, 2 is a conveyor for carrying the car body 1, and a plurality of conveyors are provided along the carrying direction (direction A). A number of trucks 2A (only one is shown) are provided, and the vehicle body 1 is placed on each truck 2A. The conveyor 2 is driven by a drive motor (not shown) to move each of the carts 2A in the direction of arrow A to convey the vehicle body 1 at a constant speed in the direction of arrow A.

3 and 3 are located in the middle of conveyance of the conveyor 2,
A pair of tracking mechanisms arranged so as to sandwich the conveyor 2 is shown, and each tracking mechanism 3 is composed of a frame 4 and an elevating mechanism moving section 5 which will be described later.

Reference numerals 4 and 4 denote a pair of frames provided along the conveying direction of the conveyor 2, and each frame 4 has two columns 4A and 4A provided apart from each other in the conveying direction of the conveyor 2. And an upper beam portion 4B installed between the support columns 4A so as to extend in the conveying direction of the conveyor 2, and a lower bridge installed between the support columns 4A located below the upper beam portion 4B. It is roughly configured from the side beam portion 4C.

Reference numerals 5 and 5 denote lifting mechanism moving portions (hereinafter referred to as moving portions 5) provided on the upper beam portions 4B of each frame 4, and each moving portion 5 is on both end sides of the upper beam portions 4B. And a pair of sprockets (not shown) disposed in each case 5A and one of the cases 5A.
An electric motor 5B located on A to rotate and drive the sprocket, a chain 5C stretched between the sprockets, and a chain located on the upper beam portion 4B so as to be movable in the carrying direction of the conveyor 2. And the moving member 5D connected to the chain 5C.
An elevating mechanism 6 described later is attached to the.

Each of the tracking mechanisms 3 moves the electric motor 5B of the moving section 5 forward and backward while accelerating and decelerating the electric motor 5B so as to move the elevating mechanism 6 attached to the moving member 5D in the arrow direction X or It moves in the X'direction at a desired speed to adjust the relative speed between the lifting mechanism 6 and the vehicle body 1 conveyed by the conveyor 2.

Reference numeral 6 denotes an elevating mechanism supported by each tracking mechanism 3 so as to straddle the conveyor 2, and the elevating mechanism 6
Are attached to the moving member 5D of each moving unit 5 so that their upper ends are opposed to each other, and a pair of lifting / lowering unit main bodies 6A and 6A each containing a sprocket, a chain, an electric motor (neither is shown), and the like. It is configured so as to form a gate shape from two connecting members 6B, 6B that are located on the upper end side of the lifting / lowering unit main body 6A and connect the two, and each of the lifting / lowering unit main bodies 6A includes
A guide groove 6C is formed on the end face on the conveyor 2 side and extends upward and downward. In addition, the lifting / lowering unit main body 6
Inside A, a drive motor (not shown) for rotating a top reciprocating mechanism 7 described later is provided. The elevating mechanism 6 moves (raises and descends) the top reciprocating mechanism 7 in the direction of arrow ZZ 'along the guide grooves 6C by rotating and driving the electric motor, and at the same time. The reciprocating mechanism 7 is rotated (tilted) in the RR ′ direction shown by the arrow.

Reference numeral 7 denotes a top reciprocating mechanism that is located above the vehicle body 1 and extends in a direction orthogonal to the conveying direction of the conveyor 2 and is provided between the respective elevating section main bodies 6A of the elevating mechanism 6. The reciprocating mechanism 7 has guide grooves 6 at both ends.
A cylindrical casing 7B fixed to a chain or the like in each of the elevating section main bodies 6A via C and having a slide groove 7A extending axially on the outer peripheral side, and a ball screw provided in the casing 7B. , A reciprocating part (not shown) composed of an electric motor, etc., and a base end side engages with a ball screw of the reciprocating part, and a tip end side projects outward through the slide groove 7A and is divided into three branches. The arm 7C and the arm 7C are roughly configured. At the tip of the arm 7C, coating machines 8 to be described later are arranged in parallel with the axis of the top reciprocating mechanism 7 at predetermined intervals.

The top reciprocating mechanism 7 reciprocates the arm 7C engaged with the ball screw in the Y-Y 'direction as indicated by the arrow by rotating the electric motor of the reciprocating part in the forward and reverse directions. is there. In addition, the top reciprocating mechanism 7
Is rotated in the direction of arrow RR 'by a drive motor provided in the lifting / lowering unit main body 6A of each lifting / lowering mechanism 6.

Reference numeral 8 denotes three coating machines attached to the tip of the arm 7C of the top reciprocating mechanism 7, and each of the coating machines 8 is constructed as, for example, an air atomizing type electrostatic coating machine, Color change valve device via paint hose, power cable, etc.
It is connected to a high voltage generator (neither shown). When the vehicle body 1 is conveyed by the conveyor 2 and reaches a predetermined position, each of the coating machines 8 atomizes the paint supplied from the color changing valve device or the like and charges the paint to, for example, about −90 kV. Is applied to the grounded vehicle body 1 to paint the vehicle body 1.

The top reciprocating type coating apparatus according to the prior art has the above-mentioned construction. When the vehicle body 1 is conveyed by the conveyor 2, as shown in FIG. While reciprocating with a constant reciprocating motion width in the −Y ′ direction, while rotating the top reciprocating mechanism 7 in the arrow R direction or the R ′ direction in accordance with the shape of the vehicle body 1, each coating machine 8 is moved by the elevating mechanism 6. The coating is performed by moving in the Z direction or the Z'direction indicated by the arrow. At this time, each tracking mechanism 3 adjusts the relative speed with respect to the vehicle body 1 conveyed in the A direction indicated by the arrow. 6, each coating machine 8 together with the top reciprocating mechanism 7 is moved at a predetermined speed in the X direction (arrow direction A) or the X'direction.

When the front portion 1A of the vehicle body 1 is coated at this time of coating, the coating machines 8 constantly spray the coating material to the front pillar portions 1B, the roof portion 1C,
When coating each rear pillar portion 1D, each coating machine 8
The paint is sprayed from each of the coating machines 8 only when is on the painting area, and the spraying of the paint from each of the painting machines 8 is stopped at the position shown by the dotted line in the figure. In addition, when the rear portion 1E is coated, the paint is constantly sprayed from each coating machine 8 as in the front portion 1A.

[0014]

By the way, in the top reciprocating type coating apparatus according to the above-mentioned prior art, when each front pillar portion 1B, roof portion 1C and each rear pillar portion 1D of the vehicle body 1 is coated, By stopping the spraying of the paint from each of the coating machines 8 at the portion deviating from 1, the wasteful spraying of the paint is prevented.

However, in the above-mentioned coating method, the spraying and stopping of the paint have to be repeated many times during the painting of the vehicle body 1, so that the spraying conditions of the paint become unstable and the thickness of the paint film is reduced. May become non-uniform, and in this case, there is a problem that color unevenness occurs.

The top reciprocating mechanism 7 is used to coat each coating machine 8
Is always reciprocated in the Y-Y 'direction indicated by the arrow with a constant reciprocating motion width, each front pillar portion 1B and roof portion 1
C, unnecessary movement (reciprocating movement) in each rear pillar portion 1D is increased, and coating time is required. As a result, in the prior art, three coating machines 8 are provided at the tip of the arm 7C of the top reciprocating mechanism 7, the reciprocating operation width of the top reciprocating mechanism 7 is reduced, and the coating time is shortened to perform coating within a predetermined time. Although it can be completed, there is a problem that the initial cost increases due to the increase in the number of the coating machines 8 and a large amount of cleaning liquid is required at the time of color change, which causes an increase in running cost.

The present invention has been made in view of the above-mentioned problems of the prior art, and the two coating machines are independently and variably reciprocally moved according to the coating width of the object to be coated so that the operation loss is eliminated and the coating is performed. It is an object of the present invention to provide a top reciprocating type coating device capable of improving film quality and reducing costs.

[0018]

In order to solve the above-mentioned problems, the structure adopted by the present invention has a conveyor for carrying an object to be coated from one side to the other side, and a position in the middle of carrying the conveyor. And a lifting mechanism that is provided on the tracking mechanism and that moves in the conveying direction of the conveyor, and that is located above the object to be coated and that can be moved upward and downward by the lifting mechanism. A top reciprocating mechanism having two reciprocating parts which are provided and reciprocate in a direction orthogonal to the carrying direction of the carrying conveyor, and each of the reciprocating parts of the top reciprocating mechanism are provided respectively toward the article to be coated. The top reciprocating mechanism has a reciprocating part that can operate independently, and the reciprocating motion width is amplified according to the coating width of the object to be coated. ， Can be reduced It made as a constituent to.

[0019]

With the above configuration, each coating machine is independently operated by each reciprocating part of the top reciprocating mechanism according to the coating width of the object to be coated,
In addition, since each coating machine does not come off from the object to be coated because it is reciprocated variably, it is possible to perform the coating in a stable state in which the coating machine is constantly sprayed with each coating machine and each coating machine is applied. The machine can be efficiently reciprocated according to the object to be coated, and the workability during coating can be improved.

[0020]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. In the embodiment, the same components as those of the prior art shown in FIGS. 6 and 7 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 11 denotes a top reciprocating mechanism according to this embodiment which is used in place of the top reciprocating mechanism 7 according to the prior art.
A casing 12, a reciprocating portion 13, and an arm 14 which will be described later are roughly configured.

First, 12 is the top reciprocating mechanism 11.
A casing forming an outer shell of
As shown in FIG. 2, a casing body 12A formed in a long cylindrical shape and two slide grooves 1 opened in the radial direction so as to extend in the axial direction of the casing body 12A.
2B, 12B, and the casing body 12
Both ends in the axial direction of A are supported by the respective lifting / lowering unit main bodies 6A of the lifting / lowering mechanism 6, and are rotated in the directions of arrows R-R 'by drive motors (not shown) in the respective lifting / lowering unit main bodies 6A. ing.

Reference numerals 13 and 13 denote two reciprocating parts provided in the casing 12. Each reciprocating part 13 is arranged along the slide groove 12B, and both ends are provided with brackets 13A and 13B. A ball screw 13C rotatably supported by the casing 12 via the
A drive motor 13D for rotationally driving C is generally included, and the ball screw 13C is engaged with the base end side of the arm 14.

Reference numerals 14 and 14 denote two arms whose distal ends project in the radial direction through the respective slide grooves 12B of the casing 12, and whose distal ends are bent in a dogleg shape.
The base end side of 4 is engaged with the ball screw 13C of each reciprocating part 13 in the casing 12. In addition, each arm 1
A coating machine 8 is attached to the tip of 4.

The top reciprocating mechanism 11 thus constructed is attached to the tip of each arm 14 by rotating the ball screw 13C of each reciprocating portion 13 in any direction by the drive motor 13D. Coating machine 8
Together with the arm 14 are reciprocated in the YY 'direction shown by the arrow. Further, each of the reciprocating portions 13 can amplify and reduce the reciprocating operation width of the coating machine 8 according to the coating width of the vehicle body 1 and can operate independently.

The top reciprocating type coating apparatus according to the present embodiment has the above-mentioned structure, and its operation will be described below with reference to FIGS. 3 to 5.

First, when the vehicle body 1 is conveyed on the carriage 2A of the conveyor 2 in the direction of arrow A at a predetermined speed, the painting of the previous vehicle body (not shown) is completed. Each coating machine 8 in the initial state position G is rotated in the direction of arrow R'to prepare for the next painting of the front portion 1A of the vehicle body 1 and stands by in the painting start state.

Then, when the front portion 1A of the vehicle body 1 reaches the coating start position, the paint is sprayed from each of the coating machines 8 under a constant spraying condition. In this state, as shown in FIG. Arrow Y- to interlock with the reciprocating motion width (about 1/2 of the coating width) according to the coating width of the front portion 1A.
While reciprocating in the Y'direction and rotating each coating machine 8 in the R direction or the R'direction indicated by the curvature of the front portion 1A, the elevating mechanism 6 moves the coating machines 8 in the Z direction indicated by the arrow. Move (painting area L1). Further, at this time, since each tracking mechanism 3 maintains a predetermined space between the front portion 1A of the vehicle body 1 conveyed by the conveyor 2 in the direction of arrow A and each coating machine 8, as shown in FIG. The elevating mechanism moving unit 5 moves the elevating mechanism 6 in the arrow X direction which is the same as the conveying direction (arrow A direction) of the vehicle body 1 at the same speed as the conveying speed, that is, between the elevating mechanism 6 and the vehicle body 1. The relative speed of is set to V1 (V1 ≈ 0).

Next, when the coating of the front part 1A is completed and each of the coating machines 8 reaches each of the front pillar parts 1B, the reciprocating parts 13 of the top reciprocating mechanism 11 are arranged such that the coating machines 8 are connected to the front pillar parts 1B. When each coating machine 8 is reached
Stop the reciprocating motion of each of the front pillars 1B.
The coating machines 8 are moved straight independently along the line (painting area L2). Since each front pillar portion 1B has a narrow coating width, it is necessary to quickly move each coating machine 8 with respect to the coating surface in order to keep the coating thickness constant. At the time of coating the pillar 1B, the elevating mechanism 6 rapidly moves each coating machine 8 in the Z direction, and each tracking mechanism 3 causes each elevating mechanism 6 to rapidly move each coating machine 8 and each front pillar portion 1B. In order to maintain a constant interval, the elevating mechanism 6 is moved in the arrow X'direction opposite to the conveying direction of the vehicle body 1,
The relative speed between the lift mechanism 6 and the lifting mechanism 6 is increased to V2, and this is dealt with.

When the coating of each front pillar portion 1B is completed and each coating machine 8 reaches the roof portion 1C, each reciprocating part 13 of the top reciprocating mechanism 11 causes each coating machine 8 to reapply.
Reciprocate (painting area L3). However, since the coating width of the roof portion 1C is smaller than the coating width of the front portion 1A described above, the reciprocating movement at this time is the reciprocating movement width of each coating machine 8 by each reciprocating portion 13. Is reduced to fit the narrow roof portion 1C. In order to make the thickness of the coating film the same as that of the front portion 1A or the like under these coating conditions, in each tracking mechanism 3, although the relative speed V2 at the time of coating of each front pillar portion 1B is slower, the lifting mechanism 6 is used. By moving in the direction of the arrow X ', the relative speed between the lifting mechanism 6 and the vehicle body 1 is increased to V3 from the relative speed V1 at the time of coating of the front portion 1A to V3, and the coating pitch of one reciprocation of each coating machine 8 is set. It corresponds to the same as when painting the front part 1A. On the other hand, at this time, the elevating mechanism 6 moves each of the coating machines 8 in the arrow Z direction or Z'direction in order to keep the coating machines 8 and the roof section 1C at a constant interval during the coating of the roof section 1C. .

Each rear pillar portion 1D (painting area L
4) and the rear portion 1E (painting area L5) will not be described because they are not much different from the front pillar portion 1B and the front portion 1A.

When the painting of the vehicle body 1 is completed as described above, each tracking mechanism 3 moves the elevating mechanism 6 at high speed in the direction of the arrow X'as shown by the chain double-dashed line in FIG. 8 is placed in the initial state position G, and the next vehicle body (not shown)
Prepare for painting.

Thus, in this embodiment, two coating machines 8 are used.
Are independently reciprocated by each reciprocating part 13 of the top reciprocating mechanism 11, and the reciprocating motion width is amplified and reduced according to the painting width of the vehicle body 1 so that each painting is performed from the vehicle body 1 at the time of painting the vehicle body 1. Since it is possible to prevent the machine 8 from coming off, it is possible to perform the coating while spraying the paint from each coating machine 8 at the time of coating, and stabilize the spray condition of the paint to prevent the occurrence of color unevenness. However, the coating quality can be greatly improved.

Further, each front pillar portion 1B of the vehicle body 1,
Since it is possible to effectively operate each coating machine 8 on the coating surface without wastefully reciprocating the coating machine 8 on the roof portion 1C or the like, it is possible to shorten the coating time of each front pillar portion 1B, roof portion 1C, or the like. It is possible to use this shortened time when painting parts that require painting time, such as the front part 1A and the rear part 1E. Therefore, the number of painting machines 8 can be reduced from three in the prior art to two. Can finish the coating within a predetermined time, reduce the initial cost, and reduce the running cost by reducing the amount of the cleaning liquid used at the time of color change.

In the above embodiment, the case where the car body 1 of the one-box type automobile is painted as the article to be coated has been described as an example, but the present invention is not limited to this, and may be, for example, a two-box type or a three-box type. Etc. may be used for painting automobiles, or may be used for painting household appliances such as refrigerators.

[0036]

As described above in detail, according to the present invention, the two reciprocating portions of the top reciprocating mechanism independently reciprocate the coating machine and reciprocate according to the coating width of the object to be coated. Since the configuration is such that the operation width is amplified and reduced, it is possible to prevent each coating machine from coming off from the object to be coated when coating it toward the object to be coated. By performing the coating in a state of being constantly sprayed, it is possible to stabilize the spraying conditions of the coating, prevent the occurrence of color unevenness, and improve the coating quality. Further, each coating machine can be effectively reciprocated according to the object to be coated, and the workability at the time of coating can be improved and the coating efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of the same position as FIG. 6 showing a top reciprocating type coating apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view showing a top reciprocating mechanism and the like in FIG.

FIG. 3 is an operation explanatory view showing the positional relationship between the vehicle body and the coating machine at the time of coating from the side.

FIG. 4 is an operation explanatory view showing a relative speed between the vehicle body and the lifting mechanism when the reciprocating motion width of each coating machine is varied according to the coating width of the vehicle body.

FIG. 5 is an operation explanatory view showing a locus drawn by a coating machine at the time of coating from a side surface.

FIG. 6 is an external perspective view showing a top reciprocating type coating apparatus according to a conventional technique.

FIG. 7 is an operation explanatory diagram showing a locus drawn by each coating machine with respect to the vehicle body during coating.

[Explanation of symbols]

 1 vehicle body (object to be coated) 2 conveyor 3 tracking mechanism 6 lifting mechanism 8 coating machine 11 top reciprocating mechanism 13 reciprocating part

Claims (1)

[Claims] 1. A conveyor for conveying an object to be coated from one side to the other side, a tracking mechanism provided in the middle of conveyance of the conveyor, and a conveyance direction of the conveyor provided in the tracking mechanism. And a two-way reciprocating mechanism which is located above the article to be moved upward and downward by the elevating mechanism and which reciprocates in a direction orthogonal to the transport direction of the transport conveyor. A top reciprocating mechanism having a moving part, and a reciprocating part provided in each reciprocating part of the top reciprocating mechanism, and a coating machine for spraying paint toward the object to be coated, each reciprocating part of the top reciprocating mechanism. A top reciprocating type coating device that can operate independently of each other, and its reciprocating operation width can be amplified and reduced according to the coating width of the object to be coated.