JPH0679212A - Adhesive applicator - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a cam switch for controlling the thetaaxis driving an application head of an adhesive applicator for applying an adhesive for temporarily fixing parts to a printed circuit board. CONSTITUTION:A cam switch 2 fixed to the theta axis 3 and interlocked with the theta axis 3 to rotate is given an electrode blocking (flocky) treatment and brought into contact with the surface of a photosensor 1 to rotate it. This constitution allows the photoelectric surface of the photosensor 1 to be normally cleaned and kept clean. thus the cam switch 2 is free from malfunction to exactly apply an adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive application device for applying an adhesive for temporarily fixing a chip component or the like to a printed circuit board when mounting the chip component or the like.

[0002]

2. Description of the Related Art In recent years, in the electronic component mounting field in which electronic components are mounted on a printed circuit board, the mounting components are rapidly becoming chips. In order to mount such a chip component on the substrate, it is common to temporarily fix the chip component to the substrate with an adhesive in advance. When the dip-type soldering is performed after the components are mounted on the board, the board is turned upside down and the mounted components are placed on the lower side, and the solder dips and soldering is performed. At this time, the mounted component is temporarily fixed by an adhesive so that the mounted component does not drop off or move on the substrate by reflow soldering. Thus, the application of the adhesive to the substrate is an important step, and the adhesive application device is indispensable for the electronic component mounting device.

FIG. 2 shows the overall configuration of a conventional electronic component mounting apparatus.
Shown in. A power supply 11, an operation panel 12, a drive motor 13, a microcomputer 14 and the like are housed in the lower part of the main body. A Y table portion 16 for holding and moving the substrate by the printed substrate receiver 15 is provided on the upper portion. on the other hand,
An adhesive application head 18 is attached to the application robot 17, and is configured to apply the adhesive at a predetermined position and a predetermined amount.

FIG. 3 shows a detailed structure of the adhesive application head portion 18. As shown in the figure, the adhesive application head section includes two heads, an application head A19 and an application head B20, each head having a tank section 21 for accommodating an adhesive, a large nozzle 22, a small nozzle 23, and a minute nozzle. It is composed of 24 three nozzles. The adhesive application head unit moves to a position determined by the application robot 17, and the cam shaft 2
The adhesive is applied according to 5.

In the adhesive applying device having such a structure, the angle of the adhesive applying nozzle is controlled by the θ-axis DC servo motor 26. Conventionally, a U-shaped photo sensor has been used to detect the origin of the θ axis and the overlimit. The photocathode of this photosensor was always facing upward, and dust was deposited on the sensor, causing malfunction of the sensor.

The operation of the photosensor mounted on the conventional adhesive coating device will be described below with reference to the drawings. FIG. 4 shows a configuration of a conventional photo sensor and cam switch. The cam switch 32 is attached to the θ-axis 33, and the U-shaped photo sensor 31 is attached with the cam switch 32 interposed therebetween. The θ axis is installed vertically,
The cam switch 32 mounted at a right angle to the θ axis is arranged horizontally. For this reason, the light receiving surface of the photoelectric element mounted on the photo sensor 31 faces upward, and dust adheres to the photoelectric surface or dust enters the photo sensor. This may cause the photo sensor to malfunction. Further, even if an attempt is made to clean the photocathode of the photo sensor 31, it cannot be cleaned because the gap is narrow.

[0007]

In such a conventional configuration, the light receiving surface of the photoelectric element mounted on the photo sensor 31 is directed upward, and dust adheres to the photoelectric surface or dust inside the photo sensor. Will invade. This may cause the photo sensor to malfunction. Furthermore, the photo sensor 3
Even if an attempt is made to clean the photoelectric surface of No. 1, there is a problem in that it cannot be cleaned because the gap is narrow.

The present invention solves such a problem, and provides an adhesive coating device equipped with a highly reliable photosensor in which the photocathode is not contaminated even if it is used for a long period of time and no malfunction occurs. The purpose is.

[0009]

In order to achieve the above object, the present invention provides an adhesive coating device having a plurality of coating heads having adhesive coating nozzles of different sizes and an adhesive tank corresponding to the coating heads. A head portion, a coating robot that moves the adhesive coating head portion to a predetermined position, a cam shaft that operates the adhesive coating head portion to discharge the adhesive, and a θ axis that controls the angle of the adhesive coating nozzle. , A photo sensor for detecting the origin of the θ axis and an over limit, the photo sensor is mounted with a cam switch with flocking processed on the surface, and the photo surface of the photo sensor comes into contact with the rotation of the cam switch. It is designed to be cleaned by flocking the switch surface.

Further, fiber piles are implanted on the surface of the cam switch by an electrostatic flocking method.

[0011]

According to this structure, the photo sensor for detecting the origin of the θ-axis and the over-limit is cleaned by the pile of hairs on the surface of the cam switch which is in contact with the photocathode of the cam switch as the cam switch rotates. , The photo sensor is always kept in a clean state, and malfunction due to adhesion of dust can be prevented. As a result, it is possible to realize an adhesive application device that accurately applies a predetermined amount of adhesive to a predetermined position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An adhesive applying apparatus according to an embodiment of the present invention will be described below with reference to the drawings. The configuration of the entire adhesive applying device is the same as that of the conventional adhesive applying device shown in FIG. 2 except for the adhesive applying head portion, and therefore description thereof will be omitted. In this embodiment, the structure of the adhesive application head portion will be described in detail.

FIG. 1 shows the structure of the adhesive coating head portion of this embodiment. In the θ-axis DC servo motor section shown in FIG. 3, electrostatic flocking (hereinafter called flockey) on the surface of the cam plate shown in FIG.
The cam switch 2 with a flockey is attached. The cam switch with flockey 2 is attached to the θ-axis 3, and the photo sensor 1 is mounted with the cam switch with flockey 2 in between. The θ axis is installed vertically, and the cam switch 2 mounted at a right angle to the θ axis is installed horizontally.

The operation of the adhesive application head section constructed as described above will be described below. Like the conventional example, the photosensor 1 has the photocathode mounted upward, and the cam switch 2 with a flockey is disposed so as to be sandwiched between the photosensors 1 and rotated by a θ-axis DC servo motor. When the cam switch with flockey 2 rotates, the flockey rotates in contact with the photocathode of the photosensor 1 to constantly clean the photocathode. By this operation, the photocathode of the photosensor 1 is always kept in a clean state, and malfunction can be completely prevented.

In this embodiment, an example in which the cam switch surface is electrostatically flocked (flocky) has been described, but the present invention is not limited to this, and even if the cam switch surface is flocked by another method. Good. In addition, cloth such as velvet may be attached to the surface of the cam switch.

[0016]

As is apparent from the above description of the embodiments, according to the present invention, the photo sensor for controlling the adhesive application head portion is always cleaned by the flockey attached to the cam switch and is kept in a clean state. Retained. Therefore, θ
It is possible to provide an adhesive application device that accurately rotates the shaft, accurately drives the adhesive application head portion, and accurately applies a predetermined amount of adhesive to a predetermined position on the printed circuit board.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a cam switch that controls an adhesive application head portion of an adhesive application device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a conventional adhesive applying device.

FIG. 3 is a perspective view showing a configuration of the adhesive application head section.

FIG. 4 is a perspective view showing a configuration of a cam switch of the adhesive application head section.

[Explanation of symbols]

 1 Photo Sensor 2 Cam Switch with Flocky 3 θ Axis 17 Coating Robot 18 Adhesive Coating Head 19,20 Coating Head 21 Tank 22,23,24 Adhesive Coating Nozzle 25 Cam Shaft

Claims (2)

[Claims] 1. A plurality of coating heads having adhesive coating nozzles of different sizes, an adhesive coating head section including an adhesive tank corresponding to the coating heads, and the adhesive coating head section are defined. A coating robot that moves to a position, a cam shaft that operates the adhesive coating head portion to discharge the adhesive, a θ axis that controls the angle of the adhesive coating nozzle, and an origin and an overlimit of the θ axis. A photo sensor for fixing the photo switch, and the photo sensor is mounted with a cam switch having a flocked surface sandwiched between the photo switch and the photo switch. Adhesive coating device. 2. The adhesive application device according to claim 1, wherein fiber piles are implanted on the surface of the cam switch by an electrostatic flocking method.