JPH07108205A - Adhesive application method and apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the adhesive from sticking out due to stringing. [Structure] The substrate 11 is loaded into a work position, and the substrate 1
The dispensing unit is moved so that the coating head portion comes directly above one coating point. From this state, the coating head unit is lowered by the vertical drive mechanism, and the coating nozzle 2
The adhesive B is ejected from 4 and the adhesive B is applied to the application point of the substrate 11 (a). After that, when the coating head unit 14 is returned to the raised position by the vertical drive mechanism (b), the coating nozzle 24 is temporarily stopped at the midway position (c), and then rapidly raised. Due to the sudden rising motion of the application nozzle 24 from the stopped state, a large cutting force is generated on the yarn by the adhesive B, and the yarn is torn in a short state (d).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive application method and apparatus for applying an adhesive to an object to be applied while moving an application nozzle up and down.

[0002]

2. Description of the Related Art In recent years, for example, a component mounting system has been provided in which an adhesive is automatically applied to a predetermined application point on a printed circuit board, and then electronic parts are automatically mounted at positions corresponding to the application point. Is coming. An adhesive coating device that constitutes a part of this component mounting system includes a transport mechanism for loading and unloading a substrate into a work position, a coating head portion for coating adhesive, and a coating head portion for freely moving in a horizontal direction. It comprises an XY moving mechanism for moving, a vertical drive mechanism for vertically moving the coating head section, a control device for controlling each mechanism based on coating data and the like to execute a coating operation, and the like.

The application head section is provided with a replaceable syringe containing an adhesive and an application nozzle communicating with the lower end of the syringe for discharging the adhesive. The coating head unit descends from above the substrate stopped at the working position, and the positive pressure is applied to the inside of the syringe for a short time at the lowered position to discharge the adhesive from the coating nozzle. The adhesive is applied to a predetermined application point on the substrate, and thereafter, the adhesive is raised and returned to the elevated position, and the operation of horizontally moving toward the next application point is repeated.

[0004]

By the way, as the adhesive, a gel having a high viscosity is generally used. Therefore, as shown in FIG. 5, when the coating nozzle 2 rises after the substrate 1 is coated with the adhesive B, the adhesive B draws a string between the coating nozzle 2 and the substrate 1 in many cases. Occur.

In the conventional adhesive applying device, the adhesive B may remain on the tip of the applying nozzle 2 in a state where the thread is long, and the applying operation of the adhesive B to the next applying point is performed as it is. When it is performed, as shown in FIG. 6, there is a problem that the residual portion due to the stringing is applied as a whisker, which is sticky out of the original application portion (circular region) of the adhesive B. When the protrusion of the adhesive B occurs in this way, for example, the conductive pattern 3 formed on the substrate 1
Adhesive B may be applied to the portion, which may lead to defective soldering of electronic components.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an adhesive coating method and apparatus capable of preventing the protrusion from the application point due to the stringing of the adhesive as much as possible. It is in.

[0007]

According to a first method of applying an adhesive of the present invention, an application nozzle for ejecting an adhesive is moved up and down between a rising position and an object to be applied, A method of applying an adhesive to an application point, wherein when the application nozzle is raised to a raised position, the application nozzle is temporarily stopped at an intermediate position and then rapidly raised. There is a feature in the place.

The first adhesive application device of the present invention is
An application nozzle that discharges an adhesive and a vertical drive mechanism that moves the application nozzle up and down are provided, and while the application nozzle is moved up and down between a raised position and an object to be applied, the application point of the object to be applied is reached. An adhesive is applied, and when the application nozzle is raised to a raised position,
It is characterized in that a control means for controlling the vertical drive mechanism is provided so that the coating nozzle is temporarily stopped at an intermediate position and then rapidly raised.

In the second adhesive coating method of the present invention, the pressure inside the coating nozzle is reduced while the coating nozzle is raised to the raised position, and the adhesive remaining at the tip of the coating nozzle is removed from the inside of the coating nozzle. It has a feature in that it is made to suck into. Further, in the second adhesive coating device of the present invention, the pressure inside the coating nozzle is reduced and the adhesive remaining at the tip is sucked into the coating nozzle while the coating nozzle is raised to the raised position. The feature is that the pressure adjusting means is provided.

[0010]

According to the first adhesive application method of the present invention, when the application nozzle rises after applying the adhesive, a phenomenon in which the adhesive pulls a thread between the object and the object to be applied occurs. The coating nozzle is once stopped at a position on the way to the ascending position, and then rapidly raised. At this time, due to the sudden rising motion, a large cutting force is generated on the yarn, and the yarn is torn. Therefore, the adhesive is cut off when the string is short, and the adhesive does not remain at the tip of the application nozzle in a state where the string is long drawn.

Further, according to the first adhesive coating device of the present invention, when the coating nozzle is raised to the raised position, the coating nozzle is temporarily stopped at an intermediate position and then rapidly raised. Since the control means for controlling the up-and-down drive mechanism is provided, similarly, the adhesive is cut when the string is short, and the adhesive remains at the tip of the application nozzle in a state where the string is long drawn. Disappears.

Further, according to the second adhesive application method of the present invention, when the application nozzle moves up after applying the adhesive, a phenomenon occurs in which the adhesive draws a string with the object to be applied. However, with the application nozzle raised to the raised position, the pressure inside the application nozzle is reduced and the adhesive remaining at the tip is sucked into the application nozzle. Therefore, even if the adhesive is in a long pulled state, the yarn is sucked into the application nozzle, so that the adhesive does not remain at the tip of the application nozzle in the pulled state.

Further, according to the second adhesive coating device of the present invention, with the coating nozzle raised to the raised position,
Since the pressure adjusting means for depressurizing the inside of the application nozzle and sucking the adhesive remaining at the tip into the application nozzle is provided, the thread is applied even if the adhesive is pulled long The adhesive will not be sucked into the nozzle and will not remain at the tip of the coating nozzle in a state where the thread is pulled.

[0014]

The first embodiment of the present invention (claims 1 and 2)
1) will be described with reference to FIGS. 1 and 2.
First, the schematic configuration of the adhesive application device according to the present embodiment will be briefly described. Although not shown, a substrate transfer mechanism for loading and unloading the substrate 11, which is an object to be coated, to and from a predetermined working position is provided on the base of the adhesive coating device.

Then, as shown in FIG. 2, the dispensing unit 12 is freely moved in the horizontal direction on the base above the substrate 11 at the working position based on a unique XY coordinate system. A well-known XY moving mechanism is provided. The dispensing unit 12 comprises a frame 13 and a plurality of coating head portions 14 (only one is shown), and the coating head portions 14 are selectively moved up and down on the substrate 11. Vertical drive mechanism 15 for applying the adhesive B to a predetermined application point
Etc. are provided.

In this case, each coating head portion 14 is supported by a slider 16, and the slider 16 is supported on the outer wall portion of the frame 13 via a linear guide 17 so as to be vertically movable. The vertical drive mechanism 15 connects a tip end portion of a link lever 19 which swings about a shaft 18 as a fulcrum to an upper end of the slider 16, and causes a cam receiving roller 20 provided on the link lever 19 to move a cam 2 by a spring 21.
The slider 16 and thus the coating head portion 14 is vertically moved between the raised position and the coating position by rotating the cam 22 by a motor (not shown).

The coating head portion 14 has a head main portion 23.
A coating nozzle 24 for discharging the adhesive B is replaceably provided at the lower end of the. In this case, the type (coating diameter or number of coating points) of the coating nozzles 24 mounted in each coating head unit 14 is different, and thus it is possible to deal with components of various shapes and sizes. .
A syringe 25 containing the adhesive B and a float (not shown) is replaceably attached to the upper part of the head main portion 23.

The lower end of the syringe 25 is communicated with the coating nozzle 24 through a pipe portion (not shown) in the head main portion 23. Further, the upper end of the syringe 25 is connected to a pressure adjusting source (not shown) via a tube 26, and when the adhesive B is discharged, the inside of the syringe 25 is kept at a positive pressure for a short time.

The substrate transfer mechanism, the XY moving mechanism, the vertical drive mechanism 15 (motor), the pressure adjusting source and the like are controlled by a control device (not shown) mainly composed of a microcomputer. As will be described later in the description of the operation, this control device is adapted to repeatedly execute the operation of applying the adhesive B to a plurality of application points on the substrate 11 based on a control program, application point data and the like.

At this time, the control device applies the adhesive agent B to the application nozzle 24 after applying the adhesive agent due to its software configuration.
When raising the (application head portion 14) to the raised position,
The vertical drive mechanism 15 is controlled so that the coating nozzle 24 is temporarily stopped at an intermediate position and then rapidly raised. Therefore, this control device functions as the control means in the present invention.

Next, the operation of the above configuration will be described mainly with reference to FIG. In the adhesive applying device configured as described above, the adhesive applying operation is executed as follows. That is, first, the substrate 11 is carried into the work position by the substrate transport mechanism and stopped. Next, the dispensing unit 12 is moved by the XY moving mechanism so that the coating head portion 14 (coating nozzle 24) is located right above one coating point on the substrate 11. At this time, the coating head portion 14 (coating nozzle 24) is in a raised position above the substrate 11.

Then, from this state, the vertical drive mechanism 15
The application head unit 14 is lowered by the above, and when the tip of the application nozzle 24 is positioned on the upper surface of the substrate 11, the inside of the syringe 25 is positively pressurized by the pressure adjustment source for a short time, and the adhesive B is applied from the application nozzle 24. The adhesive B is discharged and applied to the application point of the substrate 11 (see FIG. 1A). After this, the vertical drive mechanism 15 returns the coating head portion 14 to the raised position, moves it to the next coating point, and repeats the same coating operation.

Here, when the coating nozzle 24 rises after coating the adhesive B, as shown in FIG. 1B, the adhesive B is, so to speak, a thread between the tip of the coating nozzle 24 and the substrate 11. Occurs. However, in the present embodiment, the coating head portion 14 (coating nozzle 24) is temporarily stopped at a position on the way to the raised position (see FIG. 1C), and then is rapidly raised. Application nozzle 2 at this time
1 (d) due to the sudden rising motion from the stopped state of FIG.
As shown in, a large cutting force is generated on the thread by the adhesive B, and the thread is torn.

As a result, the adhesive B is cut when the string is short, and the adhesive B does not remain at the tip of the coating nozzle 24 in a long string state. As a result, it is possible to prevent the problem that the adhesive B is applied to the next application point as a whisker, which sticks out from the original application portion (circular area) due to stringing. is there.

As described above, according to this embodiment, the adhesive B as in the prior art remains in a state where the thread is drawn from the tip of the application nozzle 2 for a long time, and the adhesive B may squeeze out at the next application point. Unlike the existing ones, the protrusion from the application point due to the stringing of the adhesive B can be prevented as much as possible. Therefore, the adhesive B is applied to the conductive pattern portion on the substrate 11.
It is possible to prevent problems such as the application of the above.

Next, a second embodiment of the present invention (corresponding to claims 3 and 4) will be described with reference to FIGS. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted, and only different points will be described below.

In the adhesive coating device according to this embodiment, as shown in FIG. 4, the tube 26 connected to the syringe 25 is connected to the vacuum source 32 and the positive pressure source 33 via the switching valve 31. ing. Thus, the inside of the syringe 25 (application nozzle 24) can be switched to atmospheric pressure, negative pressure, and positive pressure.

In this embodiment, the control device causes the syringe 2 to discharge the adhesive B from the coating nozzle 24.
In the state where the inside of 5 is positive pressure for a short time, and after the adhesive B is applied, the application nozzle 24 is elevated to the elevated position,
The inside of the syringe 25 is set to a negative pressure for a short time, and the inside of the coating nozzle 24 is decompressed so that the adhesive B remaining at the tip is sucked into the inside of the coating nozzle 24. Therefore, the control device, the switching valve 31, the vacuum source 32, and the like constitute pressure adjusting means.

In this embodiment, as shown in FIG.
The coating head portion 14 is lowered, and the adhesive B is discharged from the coating nozzle 24 to be coated on the coating point of the substrate 11 (see FIG. 3).
(See (a)), and thereafter, the vertical drive mechanism 15 returns the coating head portion 14 to the raised position at a constant speed, for example. At this time, when the coating nozzle 24 moves up after coating the adhesive B, as shown in FIG. 3B, the adhesive B draws a thread between the tip of the coating nozzle 24 and the substrate 11, so to speak. As illustrated in FIG. 3C, the adhesive B may remain at the raised position in a state where the thread is drawn long at the tip of the application nozzle 24.

Therefore, in the present embodiment, the switching valve 31 is operated in a state where the coating nozzle 24 is raised to the raised position, the interior of the syringe 25 is decompressed, and the adhesive B remaining at the tip is coated with the coating nozzle 24. It is designed to be sucked in (see FIG. 3 (d)). Therefore, even if the adhesive B is in a state where the thread is drawn long when the application nozzle 24 is raised, the adhesive B does not remain in the state where the thread is drawn at the tip of the application nozzle 24 and is applied to the next application point. The nozzle 24 is moved.

Therefore, also in this embodiment, as in the case of the first embodiment, the adhesive B does not remain at the tip of the coating nozzle 24 in a state where a long string is pulled, and as a result, the next coating is performed. With respect to the point, the problem that the adhesive B is applied as a whisker if it sticks out from the original application portion due to stringing is prevented in advance.

[0032]

As is apparent from the above description, according to the first adhesive applying method and adhesive applying apparatus of the present invention,
When the coating nozzle is raised to the raised position, the coating nozzle is temporarily stopped at an intermediate position and then rapidly raised, so that the adhesive will be cut at a point when the stringing is short. It has an excellent practical effect that the protrusion from the application point due to the stringing of the agent can be prevented as much as possible.

According to the second adhesive coating method and the adhesive coating apparatus of the present invention, the inside of the coating nozzle is decompressed and remains at the tip while the coating nozzle is raised to the raised position. Since the adhesive is sucked into the application nozzle, the adhesive does not remain at the tip of the application nozzle, and similarly, the protrusion from the application point due to the stringing of the adhesive is prevented as much as possible. It has an excellent practical effect of being able to.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a schematic front view of a coating nozzle portion showing a sequence of coating work in order.

FIG. 2 is a schematic front view of a dispensing unit portion.

FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG.

FIG. 5 is a schematic front view of a coating nozzle portion showing a conventional example.

FIG. 6 is a plan view showing a state in which a beard is generated on the adhesive.

[Explanation of symbols]

In the drawings, 11 is a substrate (application target), 12 is a dispensing unit, 14 is an application head part, 15 is a vertical drive mechanism, 23 is a head main part, 24 is an application nozzle, 25 is a syringe, 31 is a switching valve, 32 Is a vacuum source and 33 is a positive pressure source.

Claims (4)

[Claims] 1. A method for applying an adhesive, wherein an application nozzle for ejecting the adhesive is moved up and down between a rising position and an object to be applied while applying the adhesive to the application point of the object to be applied. The adhesive coating method, wherein when the coating nozzle is raised to a raised position, the coating nozzle is temporarily stopped at an intermediate position and then rapidly raised. 2. An application nozzle for ejecting an adhesive, and a vertical drive mechanism for vertically moving the application nozzle, wherein the application target is moved up and down between a raised position and an object to be applied. In an adhesive application device adapted to apply an adhesive to the application point of an object, when the application nozzle is raised to a raised position, the application nozzle is temporarily stopped at an intermediate position and then rapidly raised. An adhesive application device comprising a control means for controlling the vertical drive mechanism. 3. An adhesive application method, wherein an application nozzle for ejecting an adhesive is moved up and down between a raised position and an object to be applied, and the adhesive is applied to the application point of the object to be applied. An adhesive application method, characterized in that, with the application nozzle raised to a raised position, the pressure inside the application nozzle is reduced so that the adhesive remaining at the tip is sucked into the application nozzle. . 4. An application nozzle for ejecting an adhesive and a vertical drive mechanism for vertically moving the application nozzle, wherein the application target is moved up and down between a raised position and an object to be applied. In an adhesive application device adapted to apply an adhesive to the application point of an object, in the state where the application nozzle is raised to a raised position, the pressure inside the application nozzle is reduced to remove the adhesive remaining at the tip. An adhesive application device, characterized in that a pressure adjusting means for sucking into the application nozzle is provided.