JPH07204557A - Coating device - Google Patents

Abstract

PURPOSE:To detect a residual quantity without pulling out the existing piston. CONSTITUTION:A position of a float 17 can be detected by detecting a metallic ring 18 being body to be detected embedded at a circumferential side part of the float 17 positioned above a piston 15 and descending in accordance with the descending of the piston 15 by a residual quantity detection device 20, thereby the residual quantity of an adhesive can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for lowering a piston by supplying air into a syringe so that a coating agent is discharged from a nozzle portion under the syringe to coat a printed circuit board.

[0002]

2. Description of the Related Art As a conventional technique of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 2-82685 filed by the present applicant. Here, in the above-mentioned conventional technology, in place of the existing piston for detecting the remaining amount of the coating agent in the syringe, it is replaced with a float for remaining amount detection which is provided so as to perform the function of the piston and detect the remaining amount. Was there. For this reason, it has been necessary to perform a troublesome work such as temporarily removing the existing piston. Further, air may be mixed in during the replacement work, and there is a fear that an appropriate amount of coating cannot be obtained.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to detect the remaining amount without removing the existing piston.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is an application apparatus for applying air into a syringe to lower a piston to discharge an application agent from a nozzle below the syringe to apply the application agent onto a printed circuit board. And a detection device which is disposed in a desired vicinity of the syringe and detects the remaining amount of the coating agent in the syringe, and the peripheral side portion which is located above the piston and descends as the piston descends. And a float in which an object to be detected detected by the detection device is embedded.

[0005]

With the above arrangement, the detection device detects the object to be detected which is located on the upper portion of the piston and is embedded in the peripheral side portion of the float that descends as the piston descends. To be detected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 shown in FIG. 2 is an X-axis motor 2 and a Y-axis motor 3
The printed circuit board is placed on the XY table 4 which is moved in the XY direction by driving. Reference numeral 5 denotes an application unit for applying the adhesive 22 (see FIG. 1) as an application agent stored in the syringe 7 through the nozzle 6 onto the substrate 1, and includes four nozzles 6. A desired one of the four nozzles 6 is selectively fixed to the coating unit 5, and the coating unit 5 is moved up and down via a nozzle up-and-down mechanism (not shown) to descend onto the substrate 1. The discharged adhesive 22 is applied to the tip of the nozzle 6.

Reference numeral 11 is a supply conveyor for supplying the substrate 1 received from an upstream device (not shown) to the XY table 4, and reference numeral 12 is for discharging the substrate 1 coated with the adhesive 22 on the table 4 to the downstream device. It is a discharge conveyor. The inside of the syringe 7 will be described with reference to FIGS. 1, 3 and 4. Reference numeral 15 is a piston for discharging the adhesive 22 from the nozzle 6, and when pulse air is supplied from a supply source to a syringe 7 covered with a cap (not shown) through a valve (not shown), the piston 15 is lowered. ,
The adhesive 22 is discharged. Further, on the peripheral side portion of the piston 15, the adhesive 2 is formed from the gap between the syringe 7 and the piston 15.
2 so as not to leak, and further to allow the adhesive 22 adhering to the inner surface of the syringe 7 to be scraped off.
Is provided.

Reference numeral 17 is a float for detecting the remaining amount of the adhesive 22 in the syringe 7 placed on the piston 15.
A metal ring 18 as an object to be sensed by the detection device 20 when the peripheral side portion approaches a remaining amount detection device 20 described later.
Is buried. Further, the float 17 is provided with a through hole 19 through which the pulsed air passes so as not to interfere with the lowering of the piston 15 by the pulsed air. As a result, the float 17 is lowered by its own weight as the piston 15 is lowered by the air. The float 17 may have a structure without the through hole 19, but in this case, the float 17 pushes down the piston 15, and the piston 15 is deformed by being sandwiched between the float 22 and the adhesive 22 having a certain degree of viscosity. Just by doing so, there is a possibility that the adhesive 22 cannot be discharged from the nozzle 6 in an appropriate amount. That is, since it is set so that an appropriate amount of the adhesive 22 is discharged by supplying an amount of air in which the shape of the lower portion of the piston 15 remains as shown in FIG. It is preferable that the adhesive 22 is discharged so that the shape of the piston 15 is not deformed by air pressure by supplying air to the adhesive 22.

Reference numeral 20 shown in FIGS. 1 and 2 is a remaining amount detecting device for detecting the remaining amount of the adhesive 22 in the syringe 7, and is arranged at a desired vicinity position below each syringe 7 as shown in the drawing. When the remaining amount of the adhesive 22 becomes smaller than a certain amount or disappears, the metal ring 18 of the float 17 descending together with the piston 15 comes close to the detection device 20, and the detection device 20 senses it. . Incidentally, the arrangement position of the detection device 20 can be arbitrarily changed by a moving mechanism (not shown), and depending on when the remaining amount of the adhesive 22 in the syringe 7 is detected,
It is moved to the position to be detected. Further, the remaining amount detecting device is not limited to the proximity sensor that senses when approaching the metal ring 18 that is the metal body described above, but it is not limited to the metal body but a magnetic proximity sensor that senses when approaching a magnetic body. It is also possible to apply the already known detection method of.

Further, as described above, the desired remaining amount becomes 1
Not only the method of detecting only the points but also the remaining amount of the adhesive 22 may be sequentially detected using, for example, a line sensor or the like.
The operation will be described below. First, the operator sets the syringe 7 in which the adhesive 22 is stored in the coating unit 5 as shown in FIG. At this time, as shown in FIG. 1, the float 17 for detecting the remaining amount is inserted on the existing piston 15 and the cap is covered.

Then, when the production operation is started, the XY table 4 is raised to the substrate transfer level (the height origin position detected by a sensor (not shown)), and the supply conveyor 11 is moved.
The substrate 1 is carried onto the XY table 4 by a substrate carrying mechanism (not shown). At this time, the coating unit 5
Has moved to a position (above the position shown in FIG. 1) that does not hinder the movement of the XY table 4 to the raised position.

When the substrate 1 is positioned on the XY table 4 by a positioning mechanism (not shown) and lowered to the position shown in FIG. 2, the coating operation is started. That is, the XY table 4 is moved so that the desired coating position on the substrate 1 is located below the desired nozzle 6, and the syringe 7
A predetermined amount of pulsed air is supplied into the nozzle 6, and the adhesive 22 is discharged to the tip of the nozzle 6, and then the nozzle 6 is lowered to apply the adhesive 22 to the substrate 1.

Thereafter, the adhesive 2 in the syringe 7 is similarly processed.
2 is sequentially applied to the substrate 1 through each nozzle 6. When the adhesive 22 in the syringe 7 reaches a predetermined amount and the metal ring 18 of the float 17 descending together with the piston 15 reaches a position close to the remaining amount detecting device 20, the detecting device 20 senses and the adhesive 22 is removed. It is detected that the predetermined amount has been reached. By utilizing this, a notifying device (not shown), for example, a notifying buzzer is sounded, a notifying lamp is turned on or blinking, or a CRT is displayed to notify the operator of the fact, whereby the operator can inject the syringe. 7 is replaced and the adhesive 22 is replenished.

[0014]

As described above, according to the present invention, instead of the existing piston for detecting the remaining amount of the coating agent in the syringe, the remaining amount is provided so as to serve as a piston and detect the remaining amount. There is no need to perform a troublesome work of replacing the float for detection, and the hands are not soiled with the coating agent. Further, since the replacement work is eliminated, there is no fear that air will be mixed. Furthermore,
Since the existing piston is used as it is, the coating agent can be used up effectively by utilizing its shape.

[Brief description of drawings]

FIG. 1 is a sectional view of a syringe.

FIG. 2 is a front view of a coating device.

FIG. 3 is a view of the inside of the syringe as viewed from above.

FIG. 4 is a partial cross-sectional view of a syringe.

[Explanation of symbols]

 1 Printed Circuit Board 4 XY Table 5 Coating Unit 6 Nozzle 7 Syringe 15 Piston 17 Float 18 Metal Ring 19 Through Hole 20 Remaining Amount Detection Device

Claims (1)

[Claims] 1. A coating apparatus for coating a printed circuit board by supplying air into a syringe to lower a piston and discharging a coating agent from a nozzle at a lower portion of the syringe, to a position near a desired position of the syringe. A detection device that is arranged to detect the remaining amount of the coating agent in the syringe, and an object to be detected that is detected by the detection device on the peripheral side part that is located above the piston and that descends as the piston descends. And a float in which is embedded.