JPH09155258A - Coating method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a coating film in the shape of a long-length belt with simple equipment and effectively even though using a technique of masking coating. SOLUTION: While a masking tape T is stuck on a surface to be coated W by a tape sticking unit 4 moving preceding it, coating is performed by a sectorial spray gun 5 following up the sticking. In a coating apparatus, a transfer base moving parallel to the surface to be coated W is transferred by a feeding mechanism, and also the transfer base is provided with a tape sticking unit 4 and a coater opposite to the surface to be coated W in a position at which the tape sticking device 4 precedes. And in the tape sticking unit 4, the masking tape T unwound from a pressing roll 13 is stuck on the boundary part of the surface to be coated W while pressing on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masking coating method for forming a strip-shaped coating film having a constant width and formed by using a fan-shaped liquid film jet nozzle, in which one or both end edges of the coating film are formed at well-cut boundaries. And devices, and more specifically, for example, in exterior coating of railway vehicles,
The present invention relates to a coating method and apparatus suitable for applying a belt-shaped coating of a color different from the background color in the longitudinal direction.

[0002]

2. Description of the Related Art In many cases, so-called masking paper, masking tape or the like is used as a masking means for forming a boundary with good cutting by spray coating. First, paint the ground color and dry it, then use a masking material such as masking paper and masking tape to cover the ground color part that should be left, and then use a spray gun for painting to color the uncovered part Paint in a different color from, then remove the masking material and dry.

[0003]

According to the above-mentioned prior art, not only the work for masking is complicated, but both a work place for masking and a work place for painting are required, and it is extremely inefficient. , Especially for rail cars 2
In color coating, when a belt-shaped different color coating is performed, it is not only necessary to use a large amount of masking material to cover a wide area, but also the work of attaching and detaching the masking is extremely complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coating method and apparatus capable of efficiently forming a long strip-shaped coating film with simple equipment despite using a masking coating method. To provide.

[0005]

In order to achieve the above-mentioned object, the present invention provides a state in which a masking tape is adhered to a surface to be painted by a tape adhering unit which moves in advance, and the masking tape is adhered to. The main feature of the coating is to use a fan-shaped spray gun for coating, and as a coating device, a transfer table that moves parallel to the surface to be coated is transferred by a feed mechanism, and the tape is placed on the transfer table facing the surface to be coated. The sticking unit and the coating machine are installed at the position where the tape sticking unit precedes, and as the tape sticking unit, the masking tape released from the tape reel is pressed against the boundary of the surface to be painted by the pressing roller. Make sure to stick
As the fan-shaped spray gun, it is desirable to adopt a tailless type with less dust scattering.

The masking work and the painting work are performed automatically and efficiently by applying the masking tape to the object to be coated by the tape application unit and performing spray coating following the application.

When the tape adhering unit is moved while pressing the masking tape unwound from the reel against the boundary of the surface to be coated by the pressing roller, the masking tape is elastically pressed and adhered by the pressing roller, and also vertically. By moving a plurality of tape adhering units provided at intervals, masking of both edges of the strip-shaped surface to be coated is performed at the same time.

Fan-shaped spraying from a plurality of fan-shaped spraying guns arranged so that the coatings of the fan-shaped spraying sprayed from the fan-shaped spraying gun overlap each other at the edges forms a band-shaped coating film of uniform film thickness. The fan-shaped air flow is added to the fan-shaped liquid jet from the fan-shaped liquid jet nozzle to surround the fan-shaped liquid jet to prevent the generation of fan-shaped spray tails, the prevention of mist scattering, and the promotion of atomization. Minimal.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the coating apparatus shown in the drawings.

FIG. 1 schematically shows a case where a belt-shaped coating p of a different color is applied to a ground color portion P which has already been painted on a vehicle body B of a railway vehicle, and the ground color portion P is not contaminated. It is necessary to overcoat as described above, and while spraying a paint of a color different from the ground color from the fan-shaped spray gun 5 onto the surface W to which the masking tape T has been applied by the tape application unit 4, The tape adhering unit 4 and the fan-shaped spray gun 5 are moved in the direction of arrow A at a constant speed so that the surface W to be coated between the upper and lower masking tapes T is coated, and after a suitable time has passed, the masking tapes After removing T, the coating film is dried by heating.

In the coating apparatus of the present invention, as shown in FIGS. 1 to 4, a transfer table 1 capable of moving in parallel with a surface W to be coated of a vehicle body B is transferred on a rail 3 by a feed mechanism 2. In addition, the transfer table 1 is provided with a required number of tape application units 4 and a coating machine 6 equipped with the required number of fan-shaped spray guns 5, and the tape application unit 4 precedes the coating machine 6. Provide at the position.

The tape adhering unit 4 is attached to the transfer table 1 with the support frame 7 interposed.
As the support frame 7, the substrate 7a is fixed to the transfer table 1, and the advancing / retreating member 7b is elastically advanced by the air cylinder mechanism 9 under the guidance of the slide mechanism 8 using the slide bearing. It is provided so as to be easy, and the mounting frame 10 is fixed to the support frame 7 so as to be adjustable up and down.
A reel 11 of masking tape T having an adhesive on one side is rotatably supported on a support shaft 12 on the mounting frame 10, and an elastic pressing roller 13 is located at a position advanced from the support shaft 12. It is provided so as to be freely rotatable, and as shown in FIGS. 2 and 3, the transfer table 1 is moved in the direction of arrow A while the mounting frame 10 is elastically advanced by the air cylinder mechanism 9, and is unwound from the reel 11. The masking tape T is attached to a predetermined position while being elastically pressed against the surface W to be coated by the pressing roller 13.

The coating machine 6 includes a transfer table 1 and a substrate 1
4a is fixed, and the support frame 14 is configured by providing the advancing / retreating member 14b on the base plate 14a under the guidance of the slide mechanism 8 using the slide bearing so that the air cylinder mechanism 9 tends to elastically advance. Mounting frame 1 for the bearing frame 14
5 is fixed so as to be adjustable up and down, a vertical mounting rod 16 is fixedly mounted on the mounting frame 15, and the fan-shaped spray gun 5 can be mounted on the mounting rod 16 with a support member 17 interposed. When mounting, the required number of top and bottom parts are vertically aligned under the condition that the edge portions of the coating films formed on the surface W to be coated by the fan-shaped spray gun ejecting the fan-shaped spray gun 5 overlap each other. The position-adjusting roller 18 with rubber tires is rotatably provided on the mounting frame 15 so that the fan-shaped spray gun 5 maintains a constant distance from the surface W to be painted.

For the tape adhering unit 4, 1
A plurality of sets of the support shaft 12 and the pressing roller 13 may be provided on the individual mounting frame 10 so as to be able to be adjusted up and down as appropriate at a predetermined interval.

As shown in FIG. 5, the tape attaching unit 4
In addition to the pressing roller 13 in FIG. 1, auxiliary pressing rollers 19 and 20 of small-diameter elastic body are rotatably provided in the subsequent position, so that the pressing roller 13 and the auxiliary pressing rollers 19 and 20 are provided.
Thus, it is desirable that the masking tape T be sequentially pressed against the surface W to be coated, so that the masking tape T can be surely attached even to the uneven portion on the surface W to be coated.

The pressing roller 13 and the auxiliary pressing roller 1
The structures of 9 and 20 are preferably those in which rubber or sponge rubber tires 13a are provided on the outer peripheral portion, and the upper end of the support shaft 12 in the tape adhering unit 4 is a butterfly while a washer is interposed. Screw the screw 21 so that the reel 11 does not come off.

As shown in FIGS. 6 and 7, the fan-shaped spray gun 5 applies a fan-shaped air flow in a state of surrounding the fan-shaped jet liquid nozzle 22 and the fan-shaped jet liquid ejected from the fan-shaped jet liquid nozzle 22. A fan-shaped jet nozzle 23 for jetting and adding, the fan-shaped jet liquid nozzle 22 is connected to a pressurized paint supply source 26 through the interposition of a valve 24 and a pressure regulator 25, and the fan-shaped jet nozzle 23 supplies this. 27, connected to the pressurized air supply source 29 through the interposition of the pressure regulator 28, so that the paint from the pressurized paint supply source 26 is applied by the pressure regulator 25 in the range of several to several tens kg / cm ^2. The air pressure from the pressurized air supply source 29 is adjusted to several kg / cm ² by the pressure regulator 28 while the fan-shaped jet liquid nozzle 22 is made to eject the air in a fan shape.
The pressure is adjusted to the following low pressure so that the fan-shaped jet liquid is ejected from the base of the fan-shaped jet liquid in a fan shape surrounding the fan-shaped jet liquid.

An example of the fan-shaped jet liquid nozzle 22 is shown in FIG.
And, as shown in FIG. 9, a wide-angle fan-shaped jet in which a substantially saddle-shaped jet opening 32 is opened by an internal groove 30 having a substantially V-shaped cross section and an external groove 31 having a trapezoidal cross section that intersects the internal groove 30 in a cross state. Although it is preferable to adopt an airless type jet nozzle suitable for the above, as shown in FIGS. 10 and 11, the internal groove 30 having a substantially U-shaped cross section and the V-shaped cross section that intersects the internal groove 30 in a crossed state. An airless jet nozzle suitable for fan-shaped jet in which a lip-shaped jet port 32 is opened by the external groove 31 may be adopted.

As the fan-shaped jet nozzle 23, for example, as shown in FIGS. 6 and 7, a substantially lip-like shape is formed by intersecting a dome-shaped concave hole 33 and a V-shaped external groove 34 having a rounded cross section. It is desirable to adopt a fan-shaped air jet type jet nozzle having an opening for the jet nozzle 35. Under the condition that the jet nozzle 23 is covered with the jet nozzle 22, the external grooves 31 and 34 of both are in parallel relation. To combine.

When a plurality of strip coatings are applied, for example, as shown in FIG.
When painting a Shinkansen 100 series vehicle like 2
After the ground color portion P on the entire outer surface of the vehicle is coated with Oyster white and dried, the window portion and the like are masked and the wide strip coating p1 and the narrow strip coating p2 are coated in blue. As the tape adhering unit 4, the masking tape T and the masking tape T are provided so as to be suitable for masking at three points of the upper edge of the strip coating p1, the lower edge of the strip coating p1 and the upper edge of the strip coating p2, and the lower edge of the strip coating p2. In addition to disposing three sets of pressure rollers 13, a coating machine 6
As for the fan-shaped spray guns 5, the fan-shaped spray guns 5 are attached while being vertically offset so that the fan-shaped sprays ejected from the respective fan-shaped spray liquid nozzles 22 are overcoated at the edge portions, It is desirable to attach them with appropriate shifts even in the relationship between the front and the back. Since the transfer table 1 is moved, the application of the masking tape T by the tape application unit 4 and the spray coating by the coating machine 6 are simultaneously performed. is there.

When there is a doorway door D having a step in the middle of the portion where the masking tape T is attached, a spacer S is temporarily provided at the step and the pressing roller 13 and the roller 18 are provided.
It is good practice to attach the masking tape T to the entrance door D before the temporary installation of the spacer S, and when the belt-shaped coating is the lower end portion of the vehicle body, only the upper end portion of the belt-shaped portion is masked. The tape T may be attached.

Of course, the present invention can be applied not only to vehicle coating but also to aircraft, ships, buildings, roads, and other strip coatings.

[0023]

As described above, according to the present invention,
It has the following effects.

A. The masking tape T is applied by the tape applying unit 4 that moves relative to the surface W to be coated, and a different color from the ground color is applied by the applying machine 6 that moves so as to follow the tape applying unit 4. Surface W to which the paint is sprayed and which includes one side edge of the masking tape T
Since it is designed to be painted, this enables masking and painting to be performed at once, and therefore, unlike the conventional technology that required a masking workshop and a painting workshop with a booth, one workshop combining both Is enough.

B. Since the plurality of masking tapes T are simultaneously stuck in parallel by the tape sticking unit 4 and the coating surface 6 between the masking tapes T is painted by the subsequent coating machine 6, the masking tapes are accurately and efficiently masked. And painting can be done.

C. Since the masking tape T that is unwound from the reel 11 is adhered while being pressed against the surface W to be coated by the pressing roller 13, the masking work can be performed easily and surely without the manual work of the operator. Moreover, the cost can be significantly reduced.

D. By arranging the plurality of fan-shaped spray guns 5 in such a state that the intervals are maintained so that the coating films by the fan-shaped sprays ejected from the fan-shaped spray guns 5 overlap each other,
A wide band-shaped coating can be formed with a uniform film thickness.

E. Since the fan-shaped spray gun 5 equipped with the fan-shaped jet nozzle 22 and the fan-shaped jet nozzle 23 for jetting and adding the fan-shaped air flow to the surrounding fan-shaped jet liquid is adopted, the generation of the tail is thereby prevented. At the same time, it is possible to improve atomization, and therefore it is possible to paint under the condition that the supply pressure of the pressurized paint and the pressurized air is remarkably reduced, and the paint mist that easily scatters during the painting work is effective. In addition to being able to prevent the paint from being significantly saved, the narrow masking portion is sufficient in combination with the effect of preventing the tail from occurring, so that a narrow masking tape T can be adopted, which is generally resource saving and economical. Target.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of a coating method by a coating apparatus of the present invention.

FIG. 2 is a plan view showing a coating device.

FIG. 3 is a partially cutaway side view of the tape adhering unit.

FIG. 4 is a partially cutaway side view of the coating machine.

FIG. 5 is a plan view of a main part of another embodiment of the tape adhering unit.

FIG. 6 is a vertical sectional side view showing a main part of a fan-shaped spray gun.

FIG. 7 is a cross-sectional plan view showing a main part of a fan-shaped spray gun.

FIG. 8 is a vertical sectional side view showing a main part of a fan-shaped jet liquid nozzle.

9 is a cross-sectional plan view of the fan-shaped jet liquid nozzle shown in FIG.

FIG. 10 is a vertical cross-sectional side view showing a main part of a fan-shaped jet liquid nozzle according to another embodiment.

11 is a cross-sectional plan view of the fan-shaped jet liquid nozzle of FIG.

FIG. 12 is a perspective view showing an outline of a state in which the coating method by the coating device of the present invention is applied to the outer plate of a railway vehicle.

[Explanation of symbols]

 1 Transfer Table 2 Feeding Mechanism 4 Tape Adhesion Unit 5 Fan Spray Gun 6 Coating Machine 11 Reel 13 Pressing Roller 19 Auxiliary Pressing Roller 20 Auxiliary Pressing Roller 22 Fan-Shaped Jet Nozzle 23 Fan-Shaped Nozzle W W Coated Surface T Masking Tape

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Aoshima 1-4-1, Mei Station, Nakamura-ku, Aichi Prefecture Tokai Passenger Railway Co., Ltd. (72) Inventor Hiroshi Okajima 3-chome, Kamiochiai, Shinjuku-ku, Tokyo No. 4 Ogiya Paint Co., Ltd.

Claims (9)

[Claims] 1. A pressing method (13) for a tape sticking unit (4) which is a coating method for applying a belt-shaped coating of a color different from the ground color and which relatively moves in parallel to the surface (W) to be coated.
The masking tape (T) is adhered while being pressed by, and a paint of a color different from the ground color is applied from the fan-shaped spray gun (5) of the coating machine (6) which moves so as to follow the tape adhering unit (4). And the surface to be coated (W) including one side edge of the masking tape (T) is sprayed. 2. The coating method according to claim 1, wherein a plurality of masking tapes (T) are attached in parallel, and the surface to be coated (W) between the masking tapes (T) is coated. 3. The coating method according to claim 1, wherein after the coating, the masking tape (T) is peeled off and the coating film is heated and dried. 4. A coating device for performing belt-shaped coating of a color different from the ground color, wherein the transfer table (1) can be moved in parallel with the surface to be coated (W) by the feeding mechanism (2). At the same time, the transfer table (1) is provided with a tape sticking unit (4) and a coating machine (6) equipped with a fan-shaped spray gun (5). A coating device characterized by being installed at the preceding position. 5. A tape sticking unit (4) which sticks a masking tape (T) unwound from a reel (11) while pressing it against a boundary portion of a surface (W) to be coated by a pressing roller (13). The coating apparatus according to claim 4, which is adopted. 6. The coating apparatus according to claim 4 or 5, wherein the plurality of tape adhering units (4) are installed in a state in which they are kept at appropriate intervals. 7. A tape adhering unit (4) comprising a pressing roller (13) and auxiliary pressing rollers (19) and (20) of small diameter, which successively follow the pressing roller (13), and is freely rotatable. Item 9. The coating apparatus according to any one of items 6. 8. A coating machine (6) in which a plurality of fan-shaped spray guns (5) are installed in such a state that the coating films formed by the fan-shaped sprays sprayed from the fan-shaped spray guns (5) overlap each other and are spaced from each other. The coating apparatus according to any one of claims 4 to 7, which is provided. 9. A fan-shaped jet nozzle (22) and a fan-shaped jet nozzle (2) for jetting and adding a fan-shaped air flow to surround the fan-shaped jet liquid jetted from the fan-shaped jet nozzle (22).
5. A fan-shaped spraying gun (5) provided with 3) is adopted.
9. The coating apparatus according to claim 8.