JPH04108555A - Spray apparatus - Google Patents

Abstract

PURPOSE:To carry out spray work in an extremely efficient manner by arranging spray members simultaneously ejecting a spray agent on both sides of the passing position of the substrate fed by a conveyor. CONSTITUTION:Coating guns 17, 17 simultaneously ejecting a coating agent are symmetrically arranged on both sides of the passing position of a printed circuit board 5 fed by a conveyor 11 in opposed relationship. The coating guns 17, 17 are supported by an arm 16 and controlled in the same timing so that the ejecting amounts and pressures of the coating agent from the coating guns 17, 17 become equal. The coating guns 17, 17 are supported by a housing 15 and the arm 16 to be moved and drive within the plane parallel to the flat surface of the printed circuit board 15 to simultaneously spray the coating agent to both surfaces of the printed circuit board 5. By this method, a spray agent can always be sprayed in a stable state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention involves discharging a spraying agent from a spraying member such as a painting gun onto a flat substrate conveyed by a conveyor, and applying the above-mentioned spraying agent to both sides of the substrate. Regarding a spraying device that sprays a spraying agent, it is particularly suitable as a spraying device that sprays a surface coating agent onto a printed circuit board.

[Prior art]

Generally, in printed circuit boards, a coating agent is sprayed on the front and back sides of the base board to create resistance.

The soldering of diodes, IC chips, etc. is configured to isolate the electrical signal circuit from the outside air except for some parts.

The thickness of the above-mentioned printed circuit boards has been shifting from thick ones (approximately 10 m5+) to thin ones (film-like ones of 1 mm or less).

First, based on FIG. 4, a procedure for spraying a coating agent onto a thick printed circuit board 1 will be described.

The printed circuit board 1 is conveyed by a roller conveyor 3 with each corner supported by a jig 2 while lying on its surface.

When the printed board l is stopped at the spraying position, the jig 2 supporting the printed board Fil is moved upward,
A coating agent is sprayed onto the surface of the printed circuit board 1 by a coating robot 4, for example.

After the spraying work of the printed circuit board Fil on one side is completed, the printed circuit board J is turned over and the printed circuit board 1 is turned over.
The coating agent is sprayed onto the other side.

Subsequently, the procedure for spraying the coating agent onto the thin printed circuit board 5 will be explained based on FIGS. 5(a) and 5(c).

If this thin printed circuit board 5 is supported with its surface lying down as in the case of the thick printed circuit board 1 described above, it will bend downward due to its own weight, so the printed circuit board 5 will be in a hanging state. Supported.

That is, both upper and lower ends of the printed circuit board 5 are held by a plurality of clips 6, respectively, and the clip 6 located above
is attached to the hanger 7. The clip 6 located below is also attached to the hanger 7 via a coil spring 8. By applying elastic tension to the printed circuit board 5 as described above, consideration is given to making the surface of the printed circuit board 5 flat.

The hanger 7 that supports the clip 6 is
Conveyed by Conhair 9.

When the printed circuit board 5 supported and conveyed by the container 9 as described above is stopped at the spraying position, the coating robot 7 sprays the coating agent onto its surface.

When the spraying operation of the coating agent on one side of the printed circuit board 5 is completed as described above, the printed circuit board 5 is turned over and the operation of spraying the coating agent on the other side is also carried out.

[Problem to be solved by the invention]

However, in the conventional spraying device as described above, since the coating agent is sprayed on each side of the printed circuit boards 1 and 5 as described above, two steps are required, and the spraying The problem was that it was inefficient.

Furthermore, although the thin printed circuit board 5 is elastically pulled by the coil spring 8, the pressure (spraying pressure) when the coating agent is sprayed from the painting robot 4 causes the printing There was a problem in that the substrate 5 itself was bent or swayed, causing uneven spraying and resulting in non-uniform film thickness.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to simultaneously spray a spraying agent onto both sides of a substrate, thereby making it possible to carry out the spraying work extremely efficiently, and even when the substrate is thin. To provide a spraying device capable of spraying a spraying agent in a stable state at all times without being deflected by the spraying pressure during spraying of the spraying agent.

[Means to solve the problem]

In order to achieve the above object, the main means adopted by the present invention is that a spraying agent is discharged from a spraying member supported by a base onto a flat substrate conveyed by a conveyor, In a spraying device that sprays the spraying agent onto the substrate, spraying members that simultaneously discharge the spraying agent are provided on both sides of the passing position of the substrate conveyed by the conveyor, and the spraying agent is sprayed onto both sides of the substrate. This is a spraying device that sprays at the same time.

Furthermore, in the apparatus, the spraying member may be arranged symmetrically with respect to the passage position of the substrate.

[Effect]

According to the spraying device according to the present invention, the spraying agent is simultaneously sprayed onto both sides of the substrate by the spraying members arranged on both sides of the passing position of the substrate conveyed by the conhair.

Furthermore, by arranging the spray member symmetrically with respect to the passage position of the board, the spray pressure will be applied to the same part of the board from both sides, so that even if the board is thin, it will not bend. Problems such as shaking or shaking are avoided.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 shows a schematic structure of a spraying device according to an embodiment of the present invention, in which FIG. 1A is a perspective view, FIG. 0) is a partial side view, and FIGS. The third part is a partial side view showing a schematic structure of a spraying device according to another embodiment of the present invention.

The spraying device 10 according to this embodiment is shown in FIG. 1(a).

As shown in (b), for example, a thin printed circuit board 5 is held at its upper end so as to be suspended by the conveyor 11. That is, the upper end of the printed circuit board 5 is held by a clip 12, and the clip 12 is attached to a hanger 13. And the above hanger 1
3 is conveyed by the conveyor 11.

A base 14 is located at a position facing the side of the conveyor 11.
is provided, and the conveyor 1 is placed on the base 14.
A housing 15 is provided that is movable in parallel to the conveyance direction of the paper. An arm 16 (base) movable in a direction perpendicular to the conveyance direction of the conhair 11 is provided on the housing 15.

The printed circuit board 5 transported by the conhair 11
Coating guns 17.17 (spraying members) for simultaneously discharging the coating agent are arranged symmetrically and oppositely on both sides of the passing position of the coating agent, and the coating guns 17.17 are supported by the arm 16.

The coating guns 17.17 are controlled at the same timing so that the discharge amount and discharge pressure of the coating agent from the coating guns 17.17 are equal. The coating gun 17.17 is supported by the casing 15 and the arm 16 and is driven to move in a plane parallel to the plane of the printed circuit board 5, and sprays the coating agent onto both sides of the printed circuit board 5 at the same time. I can do it.

Therefore, according to the apparatus of this embodiment, the coating agent can be sprayed on both sides of the printed circuit board 5 (the same applies to the printed circuit board 1) at the same time, and the spraying operation can be carried out extremely efficiently.

Furthermore, since the spraying operation of the coating agent onto the printed circuit board 5 is carried out in a single process, the installation length of the spraying line can be shortened compared to the case of conventional equipment, and accordingly, the installation length of the spraying line can be shortened compared to the case of conventional equipment. Costs can be reduced. At the same time, since a plurality of painting guns are supported by a single arm 16, the cost of the spraying device itself can be reduced.

Furthermore, the printed circuit board 5 can be attached to the conveyor 11 by holding only its upper end with the clips 12, and the efficiency of the attachment work is dramatically improved.

When spraying the coating agent onto the printed circuit board 5, as described above, the coating agent is sprayed onto the same portion from both sides at the same timing and with the same spray pressure.
The forces acting on the plane of the device cancel each other out, and even if the printed circuit board 5 is thin, the printed circuit board 5 is prevented from being bent or swaying as in the case of the conventional device. As a result, a coating layer with a uniform thickness can always be formed in a stable state.

Note that by setting the spraying pressure when discharging the coating agent from the coating gun 17, 17 to a relatively small value, a coating layer of higher quality can be obtained.

In a spraying device according to another embodiment shown in FIG. 2, the coating guns 17, 17 are supported such that their respective axes point downward at the same angle (α).

By configuring as described above, the painting gun 17.1
Even if the coating agent is discharged from the painting guns 17.17 to each other after the printed circuit board 5 has passed between the spaces between the painting guns 17.
The problem that 17 is contaminated with each other is avoided.

A spraying device according to yet another embodiment shown in FIG. 3 is constructed with a moving mechanism 18 for moving the coating gun 17, 17 symmetrically with respect to the position where the printed circuit board 5 passes.

That is, a slide stand 19 is provided on the housing 15 in place of the arm 16, and a screw with a male thread in the opposite direction is formed in the axial direction on the slide stand 19. A shaft 20 is rotatably provided. Each base side of an arm 21.21 supporting the painting gun 17.17 is slidably engaged with the screw shaft 20.

By rotationally driving the 7-axis shaft 20 by, for example, an air motor 22, the coating guns 17, 17 are moved symmetrically with respect to the position where the printed circuit board 5 passes.

By making the coating guns 17 and 17 symmetrically movable as described above, when changing the film thickness of the coating agent depending on the size and thickness of the printing base vif and 5, the discharge amount and the discharge pressure of the coating agent can be changed. , the coating gun 17 for the printed circuit boards 1 and 5 while adjusting the spray pattern width, etc.
．． 17 distance can be adjusted to respond more effectively.

〔Effect of the invention〕

As described above, the present invention provides a spraying device for discharging a spraying agent from a spraying member supported by a base onto a flat substrate conveyed by a conhair, and spraying the spraying agent on the substrate 5. A spraying device characterized in that blowing members for simultaneously discharging a spraying agent are provided on both sides of the passing position of the substrate conveyed by a conhair, so that the spraying agent is simultaneously sprayed on both sides of the substrate. Therefore, the spraying agent can be sprayed on both sides of the substrate at the same time, and the spraying work can be carried out extremely efficiently. The spray agent can be sprayed in a stable state at all times without being deflected by spray pressure.

[Brief explanation of drawings]

FIG. 1 shows a schematic structure of a spraying device according to an embodiment of the present invention, in which FIG. 1(a) is a perspective view, FIG. 1(b) is a partial side view, and FIGS. 2 and 3. 4 is a partial side view showing a schematic structure of a spray device according to another embodiment of the present invention, FIG. 4 is a perspective view showing a schematic structure of a conventional spray device, and FIG. 5 is a partial side view showing a schematic structure of a spray device according to another embodiment of the present invention. The schematic structure is shown in FIG. 1 (a) is a perspective view, and FIG. [Explanation of symbols] 1.5... Printed circuit board 10... Spraying device 11... Conveyor 12... Clip 13... Hanger 16. 21... Arm (base) 17... Painting Gun (spray member) 18...Movement mechanism 20...Screw shaft 22...Air motor

Claims (1)

[Scope of Claims] 1. In a spraying device for discharging a spraying agent from a spraying member supported by a base onto a flat substrate conveyed by a conveyor, and spraying the spraying agent on the substrate, the conveyor A spraying device characterized in that spraying members for simultaneously discharging a spraying agent are disposed on both sides of a passing position of the substrate to be conveyed, so that the spraying agent is simultaneously sprayed on both sides of the substrate. 2. The spraying device according to claim 1, wherein the spraying member is arranged symmetrically with respect to the passage position of the substrate.