JPH0897542A - Coater - Google Patents

Abstract

PURPOSE: To reduce the amount of a coating material which is thrown away for deaerating a coater as much as possible by constituting a coater so that air hardly stays in the junction between the syringe and nozzle. CONSTITUTION: The coating material discharging port section of a syringe 7 which is inserted into a nozzle 6 is constituted in such a way that the aperture 54 of the section becomes larger toward the bottom so that no air can stay in the junction between the syringe 7 and nozzle 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to supply compressed air into a syringe so that the coating agent stored in the syringe is discharged to the tip of a coating nozzle joined to the lower portion of the syringe to print the coating agent on a printed circuit board. The present invention relates to a coating device for coating.

[0002]

2. Description of the Related Art As a coating apparatus of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 6-112638 filed by the present applicant. Although not disclosed in the publication, the nozzle-syringe joint portion is a nozzle 66 as shown in FIG.
The coating material outlet portion 78 of the syringe 77 is joined in a diameter 67 of the syringe 77, and the outlet portion 78 and the diameter 67 are joined together.
Since the step portion 80 is formed by the
When the compressed air was supplied to the nozzle and was pushed out toward the nozzle 66 side, an air reservoir A (a black portion) was generated in the lower portion of the syringe 77.

Since the coating operation is affected if the production operation is started as it is, the coating agent in the syringe has to be pushed out by an extra amount in order to remove this air reservoir, which is troublesome and thrown away. The coating material was wasted.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure in which air is not easily accumulated at the joint between a syringe and a nozzle, and to reduce the amount of coating material to be discarded for air removal as much as possible.

[0005]

Therefore, the invention of claim 1 supplies compressed air into the syringe to discharge the coating agent stored in the syringe to the tip of the coating nozzle joined to the lower portion of the syringe. In a coating device that coats a coating material on a printed circuit board, the diameter of the coating material outlet portion of the syringe that enters the nozzle so that compressed air does not accumulate at the junction between the syringe and the nozzle spreads downward It is molded.

According to a second aspect of the present invention, compressed air is supplied into the syringe so that the coating agent stored in the syringe is discharged to the tip of the coating nozzle joined to the lower portion of the syringe, and the coating agent is applied to the printed circuit board. In a coating device for coating, the upper diameter of the nozzle is set to be approximately equal to the diameter of the coating agent outlet of the syringe that enters the inside of the nozzle so that compressed air does not accumulate at the junction between the syringe and the nozzle. It is formed so as to narrow toward the coating agent outlet of the syringe.

[0007]

With the above construction, in the invention of claim 1, the diameter of the coating agent outlet portion of the syringe which enters the inside of the nozzle is expanded downward so that compressed air accumulation does not occur at the joint portion of the syringe and the nozzle. It is molded. Further, in the invention of claim 2, the upper diameter of the nozzle is set to be approximately equal to the diameter of the coating agent outlet of the syringe that enters the inside of the nozzle so that compressed air does not accumulate at the joint between the syringe and the nozzle. Is shaped so as to narrow toward the coating agent outlet.

[0008]

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 is a coating unit for coating an adhesive as a coating agent on the substrate 1, 6 is a coating nozzle for discharging the adhesive to coat the substrate 1 with the adhesive, and 7 is connected above the nozzle 6. Compressed air supplied from an air source (not shown) is sent by a syringe that stores the adhesive, and the adhesive is discharged from the discharge portion 6A (see FIG. 3) of the nozzle 6.

The coating unit 5 will be described below in detail with reference to FIG. Reference numerals 8 and 9 denote rotor gears and nozzle holders for holding the coating nozzle 6, which are inserted into the insertion holes 10 and 11, respectively. The rotor gear 8 and the nozzle holder 9 are compressed by a buffer mechanism across a pair of recessed portions 12 provided in the lower portion of the rotor gear 8 and a pair of recessed portions 13 provided in the upper portion of the nozzle holder 9 so that there is a predetermined space between them. Spring 14
And the nozzle holder 9
A bolt 15 for guiding the ascent of the (nozzle 6) is inserted from above the rotor gear 8, and a screw portion 16 of the bolt 15 is fitted into the nozzle holder 9 so that the rotor gear 8 and the nozzle holder 9 are separated from each other. Although it is energized, it is installed in a regulated state. On the rotor gear 8 side, the lower limit position of the nozzle 6 is set by inserting the flange portion 17 of the nozzle 6 until it comes into contact with the bottom surface portion of the insertion hole 10.

The mechanism for fixing the nozzle 6 to the nozzle holder 9 will be described below. Reference numeral 19 is a nozzle fixing pin that enters a groove 18 formed over the entire circumference of the peripheral side surface of the nozzle 6. Reference numeral 20 is an insertion hole formed between the nozzle holder 9 and a spring stopper 21 fixed to the side surface of the holder 9, and is inserted until the stopper flange 22 at the tip of the pin 19 contacts one end of the slide bearing 23. To be done.

Reference numeral 24 is a compression spring which is locked by the one end of the spring stopper 21 and the spring flange 22 so that the pin 19 is penetrated. 25 is a knob with a knurl. Reference numeral 26 is a stopper pin that forms a predetermined space between the adhesive discharged onto the tip of the discharge portion 6A of the nozzle 6 and the substrate 1.

Reference numeral 27 denotes a nozzle up / down arm which holds the rotor gear 8 and moves up and down the coating nozzle 6, and a linear guide 30 attached to a fixed base 29 by an up / down mechanism (not shown) which moves up and down by driving an up / down motor (not shown).
Is guided and moved up and down. That is, since the arm 27 is fixed to the rotor gear 8 via the bearing 31, the vertical movement of the arm 27 also vertically moves the nozzle 6. Further, the nozzle 6 is rotated by engaging a gear (not shown) rotated by a rotation mechanism (not shown) with the gear portion 32 above the rotor gear 8. Note that, in FIG. 3, the adhesive supply passage inside the nozzle is omitted for convenience.

The nozzle holder 9 also serves as a heater block, and a heater is fitted in the nozzle 6 although not shown in the figure. Heat is transferred to the nozzle 6 through the nozzle holder 9 by heat conduction, and the inside of the nozzle 6 is bonded. The agent is maintained at a suitable temperature. The nozzle holder 9 is attached to the nozzle tip 3 which will be described later.
6, the nozzle tip 36 is inserted through the insertion hole 9A so that the nozzle body 3 described later
Heat is transferred to not only the nozzle 5 but also the nozzle tip 36.

The structure of the coating nozzle 6 will be described below. Reference numeral 35 shown in FIG. 4 is a nozzle body, and a fitting groove 38 into which the fitting portion 37 of the nozzle tip portion 36 is fitted is formed in the lower portion, and the flat surface of the flange portion 39 is the nozzle body 3.
5 is inserted until it abuts the lower part. Thus, in a state where the nozzle tip portion 36 is fitted to the nozzle body 35, the cap nut 40 is formed from the lower portion of the nozzle tip portion 36 through the insertion hole 41 of the cap nut 40 to be formed on the side surface of the lower portion of the nozzle body 35. The nut is fixed via the screw portion 42 formed.

An air tube 46 shown in FIG. 5 is connected to an air source and supplies air into the syringe 7 through a tube 45 connected to a syringe cap 47. Reference numeral 48 is a rubber seal ring that closes the fitting portion between the syringe cap 47 and the syringe 7 so that the air supplied into the syringe 7 does not leak. Reference numeral 49 denotes an insertion opening provided in the lower portion of the syringe 7 and into which the nozzle 6 is inserted. The groove 52 of the insertion opening 49 has a double ring shape (first ring 50, second ring 51) when viewed from below. The engaging portion 53 of the upper portion of the nozzle 6 is inserted therein, and the second ring is inserted into the inside of the nozzle 6 (see FIG. 1). The engaging portion 53 is made of a synthetic resin which is a material of the syringe 7. It is clamped by the insertion port 49 by elastic force.

The second ring 51 inside the insertion port 49 has a diameter 54 as it goes downward as shown in FIG.
Is shaped so that it gradually expands. Therefore, unlike the conventional case, a sharp step is not formed at the joint between the nozzle and the syringe. Therefore, when compressed air is supplied after joining and the adhesive is pushed out toward the nozzle 6 side, Caliber 5
Since it is extruded along the shape of No. 4, no air accumulation occurs.

Reference numeral 43 shown in FIG. 2 denotes a supply conveyor for receiving the substrate 1 conveyed from an upstream side device (not shown) and supplying it to the XY table 4. Reference numeral 44 denotes the substrate 1 on the downstream side of which the coating operation has been completed on the table 4. It is a discharge conveyor for discharging to. The operation will be described below. When the production operation is started, the substrate 1 is placed on the XY table 4 from the upstream side device via the supply conveyor 43 in a positioned state.

The coating operation is performed based on the NC data relating to the coating operation shown in FIG. 6 stored in the storage device. For example, in the coating step 0001, X coordinate data (mm)
And the coordinate position (X
1, Y1) is applied with Z (angle data) Z1 under the application conditions shown by the application condition data shown in FIG. That is, D (coating condition data number) of NC data in FIG. 6 is 0.
No. 1 is set, and nozzle number 1 is set based on the nozzle number 1, gauge 1, and coating time T1 set to 001 corresponding to the coating condition data of FIG. 7 (in this embodiment, the nozzle on the left side of FIG. From the gauge 1 (in this embodiment, to the syringe 7 corresponding to each nozzle 6 is adjusted by a regulator (not shown) and supplied to the nozzle 6 of the gauge 1 and the gauge 2. The pressure is selected from two types and is set in the storage device.) Adhesive is applied at a supply pressure of (3) from the air source to the syringe 7 through the air tube 46 for the application time T1 from the discharge portion 6A of the nozzle 6. The nozzle 6 is lowered by driving the vertical motor while a predetermined amount of adhesive is being discharged, and the substrate 1
Apply adhesive on top.

Next, similarly, in the coating step 0002, the coordinate position (X2, Y) on the substrate 1 shown by the NC data of FIG.
2) Nozzle 6 with nozzle number 1 in Z (angle data) Z2
Then, the syringe 7 is pressurized with the pressure of the gauge 2 for the coating time T2, and the adhesive discharged from the discharging portion 6A is lowered on the nozzle 6 to be applied on the substrate 1. Hereinafter, the coating operation of the coating step 0003 is similarly performed.

Further, in this embodiment, the nozzle 6 and the syringe 7 are
The adhesive agent outlet portion of the syringe 7 (the second ring 5
The caliber 54 of (1 part) was widened downward,
Not limited to this, for example, as shown in FIG. 8, the bore 60 on the nozzle 6 side may be connected to the adhesive outlet of the syringe 7 (second ring 51A).
Even if it is formed so as to be gradually narrowed so as to be approximately equal to the size of the caliber 54 of the portion), the movement path of the adhesive that is pushed out from the syringe 7 and moves to the nozzle 6 side is the same, preventing the occurrence of air accumulation. can do.

[0021]

As described above, according to the first aspect of the present invention, since the coating agent outlet portion of the syringe that enters the inside of the nozzle is formed so as to widen downward, it is possible to prevent air accumulation at the joint portion between the syringe and the nozzle. It can be prevented, and it is not necessary to perform a troublesome air bleeding operation. In addition, the waste of the coating agent that was thrown away to remove air is eliminated.

Further, according to the invention of claim 2, the upper diameter of the nozzle is narrowed toward the coating material outlet portion of the syringe so as to be approximately equal to the size of the diameter of the coating material outlet portion of the syringe entering the inside of the nozzle. Since it has been molded into the above, it is possible to prevent air accumulation from occurring at the joint portion between the syringe and the nozzle, and it becomes unnecessary to perform a troublesome air bleeding operation.
In addition, the waste of the coating agent that was thrown away to remove air is eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing a joined state of a nozzle and a syringe.

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

FIG. 3 is a partial cross-sectional view showing a coating nozzle fixing mechanism of a coating unit.

FIG. 4 is an exploded view of a coating nozzle.

FIG. 5 is a partial cross-sectional view showing a syringe.

FIG. 6 is a diagram showing NC data.

FIG. 7 is a diagram showing coating condition data.

FIG. 8 is a diagram showing a joined state of a nozzle and a syringe of another embodiment.

FIG. 9 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 6 Coating Nozzle 7 Syringe 49 Insertion Port 50 First Ring 51 Second Ring 52 Groove 53 Engagement Part 60 Caliber

Claims (2)

[Claims] 1. A coating device for coating a printed circuit board by supplying compressed air into a syringe to discharge the coating material stored in the syringe onto a tip of a coating nozzle joined to the lower portion of the syringe. Further, the coating device is characterized in that the diameter of the coating agent outlet portion of the syringe which enters the inside of the nozzle is expanded so as to expand downward so as not to generate compressed air pool at the joint portion between the syringe and the nozzle. 2. A coating apparatus for coating a printed circuit board by supplying compressed air into the syringe to discharge the coating agent stored in the syringe to the tip of a coating nozzle joined to the lower portion of the syringe. And the upper diameter of the nozzle is set to be approximately equal to the size of the diameter of the coating agent outlet of the syringe that enters the inside of the nozzle so that compressed air does not accumulate at the joint between the syringe and the nozzle. The coating device is characterized in that it is formed so as to become narrower toward.