JPH0339750B2 - - Google Patents

Abstract

PURPOSE:To enable uniform and quantitative coating while simplifying a structure, by performing the rotation of an adhesive emitting leaf spring for emitting an adhesive and the up-and-down movement of an adhesive receiving box by one motor. CONSTITUTION:When a pulse motor 10 is operated to rotate an output shaft 18a, a slider 31, that is, an adhesive receiving box 1 moves up and down according to the profile of the cam 35 for up-and-down movement of the slider 31. A rotary shaft 20 also rotates and an adhesive is moved while pressed to the inner peripheral surface of the adhesive receiving box by the adhesive emitting leaf spring fixed to said rotary shaft 20. When the adhesive emitting leaf spring passes above a nozzle 7, a definite amount of the adhesive is emitted to the upper surface of a lead frame for adhering a pellet from the adhesive emitting holes of the nozzle 7 by the spring force of said leaf spring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive applicator used for bonding two parts.

[Prior Art] For example, in pellet bonding of semiconductor devices, pellets are bonded onto a lead frame using a paste-like adhesive.

Conventionally, a dispenser has generally been used as an adhesive application device for applying paste-like adhesive. This structure is designed to fill a syringe with paste-like adhesive, send compressed air into the syringe, and discharge the adhesive from a nozzle. In this case, the discharge amount can be varied by adjusting the pressure of the compressed air and the time during which this pressure is applied. Further, the nozzle generally uses a syringe needle, and by changing the inner diameter of the syringe needle, the discharge area is changed to cope with differences in pellet size.

[Problems to be Solved by the Invention] Since a syringe needle is used as a nozzle, the adhesive is discharged in a round shape. For this reason, for example, when the pellet size increases to 3 mm or more, the adhesive is present only in the center part, and each corner part to which the pellet is glued is left blank, causing a problem in which pellet attachment failure occurs. Furthermore, if the diameter of the nozzle hole is increased, the amount of adhesive used will be too large, which is uneconomical, and the pellets may float and stick to the pellets at an angle, or the adhesive may bulge above the surface of the pellets. There is a problem that defects occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive coating device that solves the above-mentioned conventional problems.

[Means for Solving the Problems] The structure of the present invention for solving the problems of the above-mentioned prior art will be explained with reference to FIGS. 1 to 7 corresponding to embodiments. An adhesive storage box 1 that stores a paste-like adhesive 6 has an adhesive storage section 1a formed in a cylindrical shape. At the center of the adhesive storage box 1 is a rotating shaft 20 driven by a pulse motor 18.
is installed. One end of an adhesive discharging plate spring 23 is fixed to this rotating shaft 20, and the other end of the adhesive discharging plate spring 23 is applied to the inner circumferential surface of the adhesive storage portion 1a of the adhesive storage box 1 by spring force. Closely attached to.
A nozzle 7 is attached to a portion forming the inner circumferential surface of the adhesive storage box 1, which is in close contact with the other end of the adhesive discharge plate spring, and this nozzle 7 communicates with the adhesive storage portion 1a. An adhesive discharge hole 7a is formed. The adhesive storage box 1 and the pulse motor 18 are fixed to a slider 31, and the slider 31 is provided on a support plate 32 so as to be vertically slidable. A slider vertical movement cam 35 is fixed to the output shaft 18a of the pulse motor 18, and the lower surface of the slider vertical movement cam 35 is in contact with a cam follower 37 attached to the support plate 32.

[Function] When the pulse motor 18 operates and the output shaft 18a rotates, the slider 31, that is, the adhesive storage box 1 moves up and down according to the profile of the slider up-and-down movement cam 35. Also, the output shaft 18 of the pulse motor 18
Due to the rotation of a, the rotating shaft 20 rotates, and the adhesive 6 moves while being pressed against the inner circumferential surface of the adhesive storage box 1 by the adhesive discharge plate spring 23. When the adhesive discharge plate spring 23 passes above the nozzle 7, a fixed amount of the adhesive 6 is discharged from the adhesive discharge 7a of the nozzle 7 due to the spring force of the adhesive discharge plate spring 23.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. As is clear from FIGS. 4 to 7, the adhesive storage box 1 includes a box body 2 and a transparent lid 4 attached to the box body 2 via an O-ring 3.
The box body 2 and the lid 4 are removably attached with a known lock 5. The inside of the adhesive storage box 1 has an adhesive storage section 1a formed in a cylindrical shape, and a paste-like adhesive 6 is stored in the adhesive storage section 1a. Further, the adhesive storage box 1 has a cylindrical adhesive storage section 1a.
is arranged so that the axis of the adhesive storage box 1 is horizontal, and a plurality of A rectangular nozzle attachment hole 2a is formed for attaching a nozzle 7 having adhesive discharge holes 7a formed therein. Said nozzle 7
A collar portion 7b is formed on the outer periphery of the box body 2 to contact the lower surface of the box body 2, and a groove 9a of a U-shaped nozzle mounting plate 9 is attached to the box body 2 with screws 8.
is inserted into the nozzle mounting hole 2a of the box body 2.
It is removably attached to the Further, the lid 4 is formed with an adhesive replenishment hole 2b for replenishing the adhesive 6 into the adhesive storage portion 1a, and this hole 2b is closed with a screw 10.

The box body 2 has a hollow fixed cylinder 15 with screws 16.
is fixed. Further, in order to position the box body 2 in the fixed tube 15 so that the nozzle 7 faces downward, a positioning pin 17 is implanted in the fixed tube 15, and a positioning groove is provided in the box body 2 corresponding to this pin 17. 2c is formed. At the center of the box body 2 is a pulse motor 18 (see Figures 1 and 2).
A rotating shaft 20 is connected to the output shaft 18a of the output shaft 18a via a connecting shaft 19. It is rotatably provided. One end of an adhesive discharge plate spring 23 is fixed to one end of the rotating shaft 20 with a screw 24, and the other end of the adhesive discharge plate spring 23 is connected to the adhesive storage part 1a of the adhesive storage box 1. It is tightly attached to the inner peripheral surface by its own spring force. Further, in the adhesive storage portion 1a of the adhesive storage box 1, one end of an auxiliary leaf spring 25 is disposed above the nozzle 7, and the other end of the auxiliary leaf spring 25 It is bent at right angles along the side surface of the adhesive storage section 1a, and this bent section 25a is fixed to the side surface of the adhesive storage section 1a.

The fixed cylinder 15 and the pulse motor 18 are
As is clear from Figures 1 to 3, V on both sides
It is fixed to a slider 31 having a rail 30. The slider 31 has a V-rail 33 disposed inside the opposing vertical portions 32a of the support plate 32.
The support plate 3 is disposed so as to be slidable up and down.
The horizontal part 32b of 2 is an XY table 55 which will be described later.
Fixed on top. The lower part of the fixed cylinder 15 on the slider 31 side is open, and the fixed cylinder 1
A cam 34 for detecting one revolution and a cam 35 for vertically moving the slider are fixed to the connecting shaft 19 and the output shaft 18a of the pulse motor 18 corresponding to the open portion 5, respectively. A sensor 3 is installed in the fixed cylinder 15 in correspondence with the one-rotation detection cam 34.
6 is fixed. The lower surface of the slider vertical movement cam 35 is in contact with a cam follower 37, and this cam follower 37 is rotatably attached to a cam follower shaft 38 fixed to the support plate 32.

A horizontal plate 45 is fixed to the upper end of the slider 31, and this horizontal plate 45 is provided with a micrometer 46 in the center and screws 47 on both sides thereof. A stopper plate 48 is fixed to the support plate 32 so as to face the micrometer 46 and the screw 47. A flange portion 47a is formed at the lower end of the screw 47, and a spring 49 is disposed between the flange portion 47a and the stopper plate 48.

Therefore, when the output shaft 18a of the pulse motor 18 rotates, the adhesive discharge leaf spring 23 rotates together with the rotating shaft 20 via the connecting shaft 19. At the same time, the slider vertical movement cam 35 rotates, and the slider 3 moves according to the profile of the slider vertical movement cam 35.
1 moves up and down along the vertical portion 32a of the support plate 32. This causes the pulse motor 18 and the adhesive storage box 1 to move up and down. Here, the profile of the slider vertical movement cam 35 is as shown in FIG.
When the adhesive discharge leaf spring 23 approaches the nozzle 7, it is formed to have a minimum diameter, that is, the nozzle 7 is at the lowest position, and in this state, the micrometer 46 comes into contact with the stopper plate 48.
Therefore, the lowest position of the nozzle 7 is adjusted using the micrometer 46.

The XY table 55 includes an X table 57 provided on a base plate 56 so as to be slidable in the X direction, and a Y table 58 provided on the X table 57 so as to be slidable in the Y direction. Said X
To adjust the position of the table 57 in the X direction,
An X-direction adjustment screw 59 is disposed such that its end abuts against the X-table 57, and this X-direction adjustment screw 59 is screwed into a bracket 60 fixed to the base plate 56. In addition, the Y table 5
In order to adjust the position of the base plate 8 in the Y direction, the Y
A direction adjustment screw 61 is provided, and this Y direction adjustment screw 61 is screwed into a bracket 62 fixed to the Y table 58.

In addition, in FIG. 4, 70 indicates a lead frame, and 71 indicates a guide rail for guiding the lead frame 70.

Next, the effect will be explained. Pulse motor 18
When the output shaft 18a is activated and the output shaft 18a rotates, the slider 31 descends according to the profile of the slider vertical movement cam 35, and the micrometer 46 comes into contact with the stopper plate 48. Thereby, the nozzle 7 approaches the lead frame 70.
Further, due to the rotation of the output shaft 18a of the pulse motor 18, the rotation shaft 20 and the adhesive discharge plate spring 23 rotate in the direction of arrow A (see FIG. 5), and the adhesive 6 is transferred to the adhesive discharge plate spring 23. Adhesive storage section 1
It is moved along the inner peripheral surface of a. Then, when the adhesive discharge plate spring 23 comes to the position shown in FIG.
A certain amount of adhesive 6 is accumulated below the auxiliary leaf spring 25. When the adhesive discharging leaf spring 23 rotates further from this state, the adhesive discharging leaf spring 23 pushes down the auxiliary leaf spring 25, thereby causing the adhesive 6 accumulated below the auxiliary leaf spring 25 to move downward. Discharges a fixed amount from the adhesive discharge hole 7a of the nozzle 7,
Adhesive 6 is applied onto lead frame 70.
When the adhesive discharge leaf spring 23 passes above the nozzle 7 , the slider 31 , that is, the adhesive storage box 1 rises according to the profile of the slider vertical movement cam 35 , and the nozzle 7 separates from the lead frame 70 .

Therefore, by forming a plurality of adhesive discharge holes 7a in the nozzle 7 in accordance with the application range (size and shape of pellets) on the lead frame 70, the adhesive surface of the pellets on the lead frame 70 is large. It is also applied uniformly over the entire surface of the adhesive.
Further, since the single pulse motor 18 can rotate the adhesive discharge plate spring 23 and move the adhesive storage box 1 up and down, the structure is simplified. Furthermore, if the adhesive area on the lead frame 70 changes due to product switching, the nozzle 7 can be easily removed from the box body 2 by loosening the screws 8 and removing the nozzle mounting plate 9. It can be easily replaced with a suitable nozzle 7. By immediately cleaning the nozzle 7 that has been removed from the box body 2, the adhesive 6 in the adhesive discharge hole 7a is prevented from solidifying, making maintenance management easy.

In addition, in the above embodiment, the auxiliary leaf spring 2
5 is provided, but this auxiliary leaf spring 25 may not be provided. However, when this auxiliary leaf spring 25 is provided, the adhesive 6 is pushed out by the auxiliary leaf spring 25, so that the adhesive 6 is pushed out evenly from the plurality of adhesive discharge holes 7a of the nozzle 7. So,
Better effects can be obtained. Further, in the above embodiment, the nozzle 7 is formed to be replaceable, but the adhesive discharge hole 7a may be formed directly in the adhesive storage box 1.

[Effects of the Invention] As is clear from the above description, according to the present invention, since a nozzle having a plurality of adhesive discharge holes is provided on the bottom surface of the adhesive storage box, the area to be coated can be expanded. Can be applied evenly.
Furthermore, since a single motor can rotate the adhesive discharging plate spring for discharging the adhesive and move the adhesive storage box up and down, the structure is simplified.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the adhesive applicator according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view taken along the line B-B of FIG. 1. 4 is a sectional view of the adhesive storage box portion, FIG. 5 is a side view of FIG. 4, FIG. 6 is an enlarged sectional view of the main part, and FIG. 7 is a bottom view of FIG. 6. 1: Adhesive storage box, 1a: Adhesive storage section, 6:
Adhesive, 7: Nozzle, 7a: Adhesive discharge hole, 1
8: Pulse motor, 18a: Output shaft, 20: Rotating shaft, 23: Leaf spring for adhesive discharge, 31: Slider, 32: Support plate, 35: Cam for vertical movement of slider, 37: Cam follower.

Claims (1)

[Claims] 1. An adhesive storage box having a cylindrical adhesive storage section, a rotatable rotating shaft disposed at the center of the adhesive storage box, one end fixed to the rotating shaft, and the other end fixed to the rotating shaft. An adhesive discharging leaf spring that comes into close contact with the inner circumferential surface of the adhesive storage portion of the adhesive storage box by spring force, and the other end of this adhesive discharging leaf spring forms the inner peripheral surface of the adhesive storage box that comes into close contact with it. a nozzle provided in a part where an adhesive discharge hole is formed for discharging the adhesive in the adhesive storage section; a motor that rotationally drives the rotating shaft; and a vertical part to which the adhesive storage box and the motor are attached. a slider provided to be vertically slidable; a support plate for guiding the slider so as to be vertically slidable; a cam for vertically moving the slider fixed to a rotating member rotated by the motor; and a cam for vertically moving the slider. An adhesive applicator comprising: a cam follower attached to the support plate so as to come into contact with the lower surface of the cam.