JPH09267063A - Both surface coating applicator for thin sheet-like material to be coated - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to coat the front surface and rear surface of thin sheet- like materials to be coated with coating materials at a uniform film thickness and simultaneously to obviate the occurrence coating defects, such as sag. SOLUTION: The one-side ends of the thin sheet-like materials P to be coated which are carried in by a conveyor for carrying-in are held by clips formed at the front ends of the arms 11 of a main conveyor 5 and the other-side ends are supported by supporters of an auxiliary conveyor 6A. The thin sheet-like materials are horizontally transported in this state and the coating materials are sprayed from a coating applying machine disposed above to coat the front surfaces. The arms 11 of the main conveyor 5 are turned and inverted to the opposite side of an endless chain for transportation and the thin sheet-like materials P to be coated fixed to the front ends of the arms 11 are inverted according thereto. The front end side of the sheet-like materials to be coated is supported by the supporters of the auxiliary conveyor 68. The thin sheet-like materials with the rear surfaces faced upward are horizontally transported and the coating materials are sprayed from the coating applying machine disposed thereabove, by which the rear surfaces are coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate-shaped object, such as a printed wiring board, which is coated horizontally while being conveyed horizontally and then inverted to apply the back surface. The present invention relates to a double-sided coating device for an article to be coated.

[0002]

2. Description of the Related Art In a printed wiring board on which electronic parts such as IC and LSI are efficiently mounted in a circuit of an electronic device, the wiring pattern becomes fine and complicated as the mounting density increases, and the printed wiring board is formed on the wiring pattern. Since the individual wirings and the intervals are narrowed, fine conductive dust may adhere to the wirings and cause a short circuit. For this reason, the surface of the portion other than the land to which the electronic component is soldered is insulation-coated with the overlay to prevent the wirings of the wiring pattern from being short-circuited.

In this overlay, a photo-developing liquid resist ink is uniformly applied to the surface of a printed wiring board on which a wiring pattern is formed, and ultraviolet rays are applied to parts other than lands to be soldered to be photo-cured. It is formed by removing the uncured resist ink in the land portion. Therefore, in the case of a printed wiring board having wiring patterns formed on both front and back surfaces, it is necessary to attach the resist ink to both the front and back surfaces.
We have proposed a double-sided coating device in which electrostatic coating machines for coating resist ink on the upper surface and the lower surface of the printed wiring board are arranged on the upper and lower sides of a conveying line for horizontal conveyance (see Japanese Utility Model Publication No. 6-27986). ).

As shown in FIG. 7, an electrostatic coater 41A for coating the surface of the printed wiring board P is arranged above the transport line 42 so as to face downward, and electrostatic coater 41A is provided below it. Decoy plate 43 that forms an electrostatic field with machine 41A
A is arranged so as to sandwich the transport line 42. On the other hand, an electrostatic applicator 41B for applying the back surface of the printed wiring board P is disposed upward below the transport line 42, and an electrostatic field is formed above the electrostatic applicator 41B with the electrostatic applicator 41B. The decoy board 43B is disposed so as to sandwich the transport line 42.

According to this, electrostatic coating machines 41A, 41B
Since an electrostatic field is formed between the decoupling plates 43A and 43B, the resist ink sprayed from the electrostatic applicators 41A and 41B is made of an insulating material on the way to the decoy plates 43A and 43B, respectively. Since the front and back surfaces of P are uniformly electrostatically applied, the resist ink can be applied relatively uniformly without dripping when applied upward from below the printed wiring board.

[0006]

However, even when the decoy plates 43A and 43B are used as described above, the resist ink is sprayed downward from above the printed wiring board P and the resist ink is sprayed downward from above. In this case, the directions of the attractive force are opposite to each other. Therefore, when the coating is applied under exactly the same conditions, the film thicknesses on the front surface and the back surface become non-uniform, and the drying conditions (time, temperature) and photo-curing conditions after the coating ( There is a problem that the light intensity, time) etc. are different.
For this reason, conventionally, the spray amount of each electrostatic applicator 41A, 41B, the electrostatic applicator 41A, 41B, and the decoy plate 43A, 43B.
Although it is attempted to individually adjust the voltage value applied to the coating material and to apply the coating material on both the front and back surfaces of the coating object with a uniform film thickness, there is a problem that the adjustment work is complicated and troublesome.

Further, if the printed wiring board is carried in a state of being suspended vertically, the resist ink can be sprayed from both right and left sides of the carrying line so that both front and back surfaces can be coated under the same conditions. When the coating is applied while kept vertical, the coating material flows and the coating failure called sagging occurs. Therefore, the present invention has as a technical problem to enable the coating material to be applied to the front surface and the back surface of a thin plate-shaped object with a uniform film thickness and at the same time to prevent coating defects such as sagging. There is.

[0008]

In order to solve this problem, the present invention is a double-sided coating device for a thin plate-shaped object to be coated on both front and back surfaces of the thin plate-shaped object to be conveyed by a conveyor, On the carry-in side of the conveyor, with respect to the thin plate-shaped article to be conveyed horizontally with either one of the front and back surfaces facing upward, a first coating zone for spraying the coating material from above is formed. In the state of inverting the thin plate-shaped article to be carried out, a second coating zone for spraying a coating material from above is formed, and the conveyor is from the first coating zone to the second coating zone. A large number of arms, each of which has a clip for holding one end of the thin plate-shaped object that has been carried in by a carry-in conveyor, is attached to the endless chain for transportation, which is rotatably attached to the periphery thereof along the traveling direction. Sandwiched between the arms The thin plate-shaped object to be coated is horizontally conveyed along one side of the conveying endless chain in the first coating zone, and the arm is conveyed at the transition from the first coating zone to the second coating zone. And a main conveyor for rotating and reversing to the opposite side of the endless chain for transporting, and transporting the thin plate-shaped object in a horizontal state along the opposite side of the transporting endless chain in the second coating zone; The second coating zone is composed of auxiliary conveyors respectively arranged on opposite sides of the main conveyor with the arm inversion position sandwiched therebetween, and each of the auxiliary conveyors carries a thin plate-shaped article in parallel with the main conveyor. A support tool for supporting the other end side of the thin plate-shaped article whose one end is held by the arm of the main conveyor from below is attached to the endless chain arranged along the side facing the arm at predetermined intervals. The auxiliary conveyor, which is attached to the auxiliary conveyor arranged in the first coating zone so that the distance between the main conveyor and the main conveyor can be adjusted according to the size of the thin plate-shaped material to be coated, By gradually approaching the main conveyor side, by pushing the thin plate-shaped article to the main conveyor side in a state where one end of the thin plate-shaped article that has been horizontally carried in by the carry-in conveyor is placed,
It is characterized by comprising a loading mechanism for holding the opposite edge of the thin plate-shaped article to be clipped by the clip.

According to the present invention, the thin plate-like object to be coated carried in by the carry-in conveyor is brought close to the main conveyor side with one end side thereof being placed on the support of the first auxiliary conveyor. Therefore, the thin plate-like object is pushed into the main conveyor side, and the opposite edge is inserted into the clip formed at the tip of the arm of the main conveyor and is clamped. Therefore, one end of the thin plate-shaped object is held by the clip formed on the arm of the main conveyor, and the other end is supported by the support tool of the first auxiliary conveyor, so that both ends of the thin plate-shaped object are supported. Unlike the case where only one end is supported, it does not tilt due to its own weight, and for example, it is conveyed horizontally with the surface facing up, and the surface is sprayed with a coating material from a coating machine placed above it. Is applied.

Next, when the coating of the surface is completed, the arm of the main conveyor is rotated to the opposite side of the transporting endless chain and inverted, and along with this, the thin plate-like object fixed to the tip of the arm is also inverted. Therefore, the tip side of the thin plate-shaped coated object is supported by the support tool of the second auxiliary conveyor, and is conveyed horizontally with the back side facing upward, and the coating material is sprayed from the coating machine arranged above it. And the back side is applied.

Since the first and second auxiliary conveyors are arranged so that the distance between them and the main conveyor can be adjusted, various sizes can be obtained by adjusting the distance according to the size of the thin plate-shaped article to be coated. The article to be coated can be applied.

[0012]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a plan view showing an example configuration of a double-sided coating device for a thin plate-like object to be coated according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a front view thereof, and FIG. 4 is an explanatory view showing an inversion mechanism. 5 and 6 are schematic configuration diagrams showing a main part.

Reference numeral 1 in the figure denotes a double-sided coating device for a thin plate-shaped object to be coated on a front surface and a back surface of a thin plate-shaped object to be conveyed by a conveyor 2, which is horizontal on the carry-in side with its surface facing upward. To the thin plate-like article P to be transported to the coating machine 3A arranged above.
A front surface coating zone (first coating zone) 4A for spraying the coating material from is formed, and is arranged on the unloading side and above the thin plate-shaped article P that is conveyed horizontally with its back surface facing upward. A back surface coating zone (second coating zone) 4B for spraying the coating material from the coating machine 3B is formed.

The conveyor 2 is a main conveyor 5 which conveys the thin plate-shaped article P with one end fixed from the loading position 7A to the unloading position 7B through the front surface coating zone 4A and the back surface coating zone 4B. , A front surface coating auxiliary conveyor (first auxiliary conveyor) 6A for supporting the other end of the thin plate-shaped article P arranged in parallel with the main conveyor 5 in the front surface coating zone 4A, and a back surface coating zone 4B It is composed of a back surface coating auxiliary conveyor (second auxiliary conveyor) 6B which supports the other end of the thin plate-shaped article P arranged on the opposite side of the front surface coating auxiliary conveyor 6A in parallel with the conveyor 5. There is.

Then, the main conveyor 5 is transported from the loading position 7A to the unloading position 7B through the front surface coating zone 4A and the back surface coating zone 4B to the unloading position 7B. A large number of arms 11 each provided with a clip 10 for holding the coated object P in a horizontal state with its surface facing upward are rotated around its circumference along a traveling direction via a rotary shaft 12 parallel to the transport direction. It is attached freely.

The arms 13A and 13B are laid in the front surface coating zone 4A and the back surface coating zone 4B, respectively.
1 is a guide rail that horizontally supports 1 and reverses the arm 11 with the conveyance of the main conveyor 5 at the transition from the front surface coating zone 4A to the back surface coating zone 4B. Guide rail 13 laid in the surface coating zone 4A
As shown in FIG. 4, A is an endless chain 8 for transportation.
A horizontal guide portion 14A for horizontally supporting the arm 11 along one side of the above, and a spiral portion 15A for rotating the arm 11 so as to vertically stand at the exit of the front surface coating zone 4A. The guide rail 13B thus formed is a spiral portion 1 for rotating the arm 11 vertically erected by the spiral portion 15A of the guide rail 13A at the entrance of the back surface coating zone 4B to a horizontal position.
5B and a horizontal guide portion 14B that horizontally supports the arm 11 along the opposite side of the transporting endless chain 8.

As a result, the thin plate-like article P fixed to the arm 11 at the loading position 7A is conveyed horizontally along one side of the conveying endless chain 8 in the front surface coating zone 4A, and the back surface coating zone 4A is coated. At the time of transition to the zone 4B, the arm 11 is rotated to be rotated 180 ° to the opposite side of the transport endless chain 8 and inverted, and is horizontally moved along the opposite side of the transport endless chain 8 in the back surface coating zone 4B. Be transported.

Further, the surface coating auxiliary conveyer 6A is arranged in the surface coating zone 3A in parallel with the main conveyor 5 on the side where the thin plate-shaped article P is conveyed.
A support 17A for supporting the other end side of the thin plate-shaped article P held by the arm 11 of the main conveyor 5 from below is attached to 6A facing the arm 11 at predetermined intervals. Then, the coating auxiliary conveyer 6A is guided along the guide rail (loading means) 18 that is installed so that the endless chain 16A at the loading position 7A is inclined so as to approach the main conveyor 5, and thus the support tool 17A
Is to approach the main conveyor 5 side at the loading position 7A, and push one edge of the thin plate-like article P horizontally loaded by the loading conveyor 9 into the main conveyor 5 side with one end placed. Thus, the opposite edge of the thin plate-shaped article P is inserted into the clip 10 so as to be clamped and fixed.

Further, the back surface coating auxiliary conveyor 6B is
In the back coating zone 3B, the arm 11 of the main conveyor 5 is connected to the endless chain 16B arranged in parallel with the main conveyor 5 along the side on which the thin plate-shaped article P inverted by the main conveyor 5 is conveyed. Thin plate-like object P to be held at one end
17B for supporting the other end side of the above from below is attached at a predetermined interval so as to face the arm 11. Then, the front surface coating auxiliary conveyor 6A and the back surface coating auxiliary conveyor 6
B is arranged so that the distance can be adjusted by approaching or separating from the main conveyor 5 according to the size of the thin plate-shaped article P.

The front surface coating zone 4A and the back surface coating zone 4B in which the coating machines 3A and 3B are arranged are provided with the air supply chamber 2.
A flow plate 21 that forms a water film for collecting the oversprayed coating material under each of the coating machines 3A and 3B with the thin plate-shaped article P that is covered with 0 and conveyed by the conveyor 2 being sandwiched therebetween. Is arranged so that the contaminated exhaust gas flowing down into the air supply chamber 20 is purified through the exhaust treatment device 22 and then discharged to the outside. Further, each conveyor 5, 6A, 6B has an endless chain 8,
16A, 16B along the return path, each arm 11, 17
Cleaning nozzles 23, 24A, 24B for cleaning and removing the coating material adhered to A, 17B are integrally arranged, and even when the distance between the auxiliary conveyors 6A, 6B is adjusted, the cleaning nozzles 23, 24A, 24B move integrally with this and are reliable. The arms 17A and 17B can be cleaned.

The above is an example of the configuration of the present invention, and its operation will be described below. First, the thin plate-shaped article P that has been carried into the loading position 7A by the carry-in conveyor 9 is mainly supported by the support tool 17A with one end thereof being placed on the support tool 17A of the surface coating auxiliary conveyor 6A. Since it is close to the conveyor 5 side, the thin plate-shaped article P is pushed into the main conveyor 5 side, and its edge is inserted and fixed in the clip 10 formed at the tip of the arm 11 of the main conveyor 5. Therefore, one end of the thin plate-shaped article P is held by the clip 10 formed on the arm 11 of the main conveyor 5, and the other end is supported by the support tool 17A of the surface coating auxiliary conveyer 6A. Since both ends of the coating material P are supported, unlike the case where only one end is supported, the coating material P does not tilt due to its own weight and is conveyed horizontally with the surface facing upward, and the coating material is sprayed onto the surface from the coating machine 3A. To be

Then, when the coating of the surface is completed, the arm 11 of the main conveyor 5 is guided by the spiral portions 15A and 15B of the guide rails 13A and 13B, and is rotated to the opposite side of the endless chain 8 for conveyance and turned over by 180 °. Along with this, the thin plate-shaped article P fixed to the tip of the arm 11 is also inverted, and its back surface is conveyed upward. At this time, the front end side of the thin plate-shaped article P is placed and supported on the support tool 17B of the back surface coating auxiliary conveyer 6B, and the back surface is coated by spraying the coating material from the coating machine 3B arranged above it. .

When applying thin plate-like objects P of different sizes, the distance between the main conveyor and the front surface coating auxiliary conveyor 6A and the back surface coating auxiliary conveyor 6B may be adjusted according to the size. It is possible to apply both sides of the article P according to each size.

[0024]

As described above, according to the present invention, the surface of the thin plate-shaped article to be coated is conveyed horizontally in the upward direction, the coating material is applied to the surface, and then the coating material is inverted to form the back surface. Since the coating material is applied with the top facing upward, in both cases, by spraying the coating material downward from the coating machine arranged above, both the front surface and the back surface can be coated under substantially the same conditions. It is not necessary to individually set the operating conditions of each coating machine, and it is possible to form a uniform coating film without causing coating defects such as sagging and uneven film thickness. Further, at the loading position, since the thin plate-shaped article to be coated is automatically loaded, there is no trouble of loading work, and further, the front surface coating auxiliary conveyer and the back surface coating auxiliary conveyer are moved close to or away from the main conveyor. Since the interval can be adjusted, it is possible to reliably transport thin plate-shaped objects of various sizes in a horizontal state and apply them uniformly.

[Brief description of drawings]

FIG. 1 is a plan view showing an example configuration of a double-sided coating device for a thin plate-shaped article to be coated according to the present invention.

[Figure 2] Side view

FIG. 3 is a front view thereof.

FIG. 4 is an explanatory view showing a reversing mechanism.

FIG. 5 is an enlarged view showing a main part thereof.

FIG. 6 is an enlarged view showing a main part thereof.

FIG. 7 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 1 ... ・ Double-sided coating device for thin plate-shaped coating material 2 ・ ・ ・ Conveyor P ・ ・ ・ ・ ・ Thin plate-shaped coating material 3A, 3B ・ ・ ・ Coating machine 4A ・ ・.... Front-side coating zone (first coating zone) 4B ...- Back-side coating zone (second coating zone) 5 ...- Main conveyor 6A, 6B ... Auxiliary conveyor 7A・ ・ ・ ・ Loading position 7B ・ ・ ・ ・ ・ ・ Unloading position 8 ・ ・ ・ ・ ・ Endless chain for transportation 9 ・ ・ ・ ・ ・ ・ ・ Conveyor for loading 10 ・ ・ ・ ・ Clip 11 ... Arms 16A, 16B ... Endless chains 17A, 17B .. Supports 18 .. Guide rails (loading means)

Claims (1)

[Claims] 1. A double-sided coating device for a thin plate-shaped article to be coated on both front and back sides of a thin plate-shaped article (P) conveyed by a conveyor (2), wherein: A first coating zone (4A) for spraying a coating material from above is formed on a thin plate-like article (P) that is conveyed horizontally with one surface facing upward on both front and back surfaces, and A second coating zone (4B) for spraying a coating material from above is formed on the unloading side in a state where the thin plate-shaped article to be coated (P) is inverted, and the conveyor (2) is a first coating. A clip that holds one end of the thin plate-shaped article (P) carried in by the carry-in conveyor (9) in the endless chain for transfer (8) from the zone (4A) to the second coating zone (4B) ( A large number of arms (11) provided with 10) on the tip side are arranged around it along the traveling direction. Movably mounted, the arm (11) the clamping thin plate-like article to be coated (P) is the first application zone (4A)
The endless chain (8) is conveyed horizontally along one side of the endless chain (8) for transfer, and the arm (11) is moved to the endless part for transfer at a place where the first coating zone (4A) is transferred to the second coating zone (4B). The thin plate-shaped object to be coated (P) is conveyed in the horizontal state along the opposite side of the conveying endless chain (8) in the second coating zone (4B) by rotating it to the opposite side of the chain (8) and reversing it. Main conveyor (5) and auxiliary conveyors (6A, 6B) respectively arranged on the opposite side of the main conveyor (5) with the arm inversion position sandwiched between the first and second coating zones (4A, 4B). ) And each of the auxiliary conveyors (6A, 6B) is an endless chain (16A, 16B) arranged along the main conveyor (5) along which the thin plate-shaped article is conveyed. , A thin plate whose one end is held by the arm (11) of the main conveyor (5) Supports (17A, 17B) for supporting the other end side of the article to be coated (P) from below are attached at a predetermined interval so as to face the arm (11), and have a size corresponding to that of the thin plate article (P). Auxiliary conveyor disposed in the first coating zone (4A) so that the distance to the main conveyor (5) can be adjusted accordingly.
(16A), the support tool (17A) is gradually brought closer to the main conveyor (5) side at the carry-in end side, and the carry-in conveyor (9) is provided.
The thin plate-shaped article to be coated (P), which has been horizontally loaded by pushing the thin plate-shaped article to be coated (P) toward the main conveyor (5), with one end thereof being placed, A double-sided coating device for a thin plate-shaped article, comprising a loading mechanism (18) for holding the opposite edge of (P) to the clip (10).