JPH08335770A - Dispenser in parts mounting system - Google Patents

Abstract

PURPOSE: To suppress fluctuation in the quantity of coating by reducing the weight and inertia at the elevating/lowering part of a dispenser while reducing the size of elevating/lowering mechanism and increasing the speed of elevating/ lowering operation. CONSTITUTION: A syringe 13 storing coating agent is secured to the fixing frame 12 of a head unit body 10 and a coating agent feeding part 14 having a nozzle 15, at the forward end, is fixed to the fixing frame 12 such that it can be elevated/lowered. The coating agent feeding part 14 is coupled through a flexible tube 33 with the syringe 13 and elevated/lowered through a drive means equipped with the syringe 13 and a lever 46 for increasing the operating speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispenser for applying an adhesive or the like to a printed circuit board in a component mounting system.

[0002]

2. Description of the Related Art Generally, a mounting system for mounting electronic parts on a printed circuit board is provided with an adhesive agent such as adhesive or cream solder for fixing the parts on the printed circuit board before a mounter for mounting the parts. A dispenser for applying is provided.

In a conventional dispenser, a dispensing head unit is movably arranged above a base, and a syringe for storing an application agent and a nozzle at the tip of the head unit are provided at the lower end of the syringe. A dispensing head including an integrally provided coating material dispensing portion is provided so as to be able to move up and down, and an elevating mechanism for raising and lowering the dispensing head is also provided. Then, at the time of dispensing work, after moving the head unit above the coating portion of the printed board, lowering the dispensing head until the nozzle reaches the surface to be coated, and then pressurizing the inside of the syringe to press the nozzle. The coating material is discharged from the discharge holes and applied onto the printed circuit board.

[0004]

In the conventional dispenser as described above, since the syringe and the coating material dispensing portion are integrally lifted and lowered, when the elevator is lifted or stopped at the lower end position. In addition, the inertial force of the coating agent stored in the syringe acts on the discharge hole of the nozzle of the coating agent supply section, which may cause the coating agent to overflow from the discharge hole during the ascending / descending, or the coating amount may vary. There is an inconvenience to do. Further, since the weight and inertia of the ascending / descending portion become large, the driving force required for ascending / descending increases, leading to an increase in the size of the driving mechanism, and there is also a problem that the speeding up / down operation is hindered.

In view of the above-mentioned circumstances, the present invention can suppress variations in the coating amount by reducing the weight and inertia of the elevating part of the dispenser, and can downsize and elevate the mechanism for elevating. It is an object of the present invention to provide a dispenser that enables high speed operation.

[0006]

The invention according to claim 1 is
A dispensing head unit provided above the base is provided with a syringe that stores the coating agent, and a coating agent supply section that has a nozzle at the tip and discharges the coating agent sent from the syringe from the nozzle. In a dispenser equipped to apply the coating agent to a predetermined part of the printed circuit board, the syringe is fixed to the head unit main body, while the coating agent supply part is attached to the head unit main body so that it can be moved up and down. The agent supply section and the syringe are connected via a flexible tube for conducting the coating agent, and an elevating drive means for moving the coating agent supply section up and down is provided.

In the dispenser of the present invention, it is preferable that the elevating and lowering drive means elevates and lowers the coating agent supply section by an air cylinder (claim 2). Further, it is preferable that the lifting drive means is provided with a lever for accelerating the operation of the air cylinder and transmitting it to the coating agent supply section (claim 3).

Further, in the dispenser of the present invention, a mounting frame capable of moving up and down is provided on the head unit main body, and the coating agent supply section and the elevating drive means for raising and lowering the coating section are mounted on the mounting frame, and the mounting frame is mounted on the mounting frame. It is preferable to provide a height position adjusting means for adjusting the height position of the coating agent supply part by moving it up and down (claim 4).

[0009]

According to the dispenser of the present invention, at the time of the dispensing operation, with the head unit being located above the printed circuit board, the operation of the ascending / descending driving means lowers the coating agent supply section, and then the coating solution is delivered from the nozzle discharge hole. After the agent has been discharged and applied to the surface to be coated, the operation of the elevating drive means raises the coating agent delivery section.In this case, the syringe is fixed and only the coating agent delivery section is provided. By raising and lowering, the inertial force acting on the nozzle is reduced during raising and lowering or stopping at the lower end position, and the weight of the raising and lowering portion is reduced, so that the required drive of the raising and lowering drive means. Power is reduced.

In this dispenser, if an air cylinder is used as the elevating drive means, the structure of the elevating drive means is simplified. In particular, if a lever for accelerating the operation of the air cylinder is provided, as described above, Combined with the reduction in weight, the lifting / lowering operation is speeded up with a simple structure.

Further, if the height position adjusting means as described above is provided, the height position adjusting means adjusts the height position of the coating agent supply portion in accordance with the height position of the coated surface. Then, the elevating and lowering drive means elevates and lowers the coating material dispensing part.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the entire dispenser,
In this figure, a conveyor 2 for transferring a board is arranged on a base 1 of a dispenser, and a printed board (not shown) is transferred on the conveyor 2 and stopped at a predetermined working position. .

A head unit 5 for dispensing is installed above the base 1, and the head unit 5 is in the X-axis direction (direction of the conveyor 2) and in the Y-axis direction (direction perpendicular to the X-axis on a horizontal plane). ) Can be moved to.

That is, a pair of rails 6 extending in the Y-axis direction are arranged on the base 1, and a head unit supporting member 7 is arranged on the rails 6 so as to be movable in the Y-axis direction. A guide portion 8 extending in the X-axis direction is provided on the head unit support member 7, and the head unit 5 is held by the guide portion 8 so as to be movable in the X-axis direction. The head unit support frame 7 is moved by a Y-axis drive mechanism (not shown) including a Y-axis servo motor and a ball screw, and the X-axis drive mechanism (not shown) includes an X-axis servo motor and a ball screw. Thus, the head unit 5 is moved with respect to the head unit support frame 7.

2 to 7 show the structure of the head unit 5. In these figures, the main body 10 of the head unit 5 is the head unit supporting member 7 (see FIG. 1).
A wall body 11 that is movable in the X-axis direction through the supported portion 11a and is fixedly supported in the vertical direction; and a wall body that is positioned in front of the wall body 11 and is vertically movable on the wall body 11. The mounting frame 12 and the mounting frame 12. The head unit main body 10 has a syringe 13 for storing a coating agent such as an adhesive or cream solder, a coating agent supply section 14 having a nozzle 15 at a tip thereof, and a lifting drive means for moving the coating agent supply section 14 up and down. A height position adjusting means for adjusting the height position of the coating agent dispensing section is provided. In this embodiment, three sets of the syringe 13 and the coating agent dispensing section 14 are provided, and the coating agent dispensing section 14 can be used in different amounts by different coating amounts.

The syringe 13 is the head unit body 1
0, and in this embodiment, a syringe mounting portion 16 provided on the front side of the mounting frame 12 of the head unit body 10.
It is fixed via a holder 17. The holder 17 also serves as a heating unit for the syringe 13, is formed in a shape surrounding the syringe 13, and has a heater 18 inside thereof, and the lower portion of the syringe 13 is inserted into the holder 17. Has been held. A pipe-shaped passage portion 13a is integrally provided at a lower end portion of the syringe 13, and a tip of the passage portion 13a is provided at a holder 17
Projecting below.

The heater 18 is connected to a temperature controller (not shown), and a temperature sensor 19 composed of a thermocouple is attached to the holder 17, and the heating temperature of the heater 18 is detected based on the temperature detected by the temperature sensor 19. Is adjusted. Further, a liquid level sensor 2 for detecting the liquid level of the coating agent in the syringe 13 when the liquid level of the coating liquid in the syringe 13 becomes lower than a predetermined level is provided at a predetermined position on the holder 17.
0 is provided.

The syringe 13 is connected to a positive pressure supply source and a negative pressure supply source via a switching valve (not shown) and a regulator for adjusting the pressurization and depressurization. The coating agent is extruded, and in other cases, a negative pressure is applied to the inside of the syringe 13 to prevent the coating agent from flowing out.

Further, as shown in detail in FIG. 6, the coating agent delivering section 14 has a nozzle assembly in which a nozzle shaft 22, a cap nozzle 23 and a nozzle 15 are arranged in a hollow nozzle holder 21 which also serves as a heating section. Then, the nozzle assembly is attached to the nozzle block 24, and the nozzle block 24 is attached to the attachment frame 12.
By being fixed to the shaft 25 that is vertically movable, the coating agent supply section 14 can be vertically moved with respect to the mounting frame 12.

The structure of the coating agent supply section 14 will be specifically described. The nozzle holder 21 has bolt fastening portions 26 on both sides thereof and is fixed to the nozzle block 24 by a pair of bolts 27. (See FIG. 2).
A heater 28 is provided on the peripheral wall of the nozzle holder 21,
A temperature sensor 29 including a thermocouple is provided, and the heater 28 is connected to a temperature controller (not shown) via a harness 30 so that the heating temperature is adjusted based on the temperature detection by the temperature sensor 29. Has become. Then, inside the nozzle holder 21, the nozzle shaft 22
And the cap nozzle 23 fitted to the tip thereof is inserted, and the nozzle 1 is attached to the tip side of the cap nozzle 23.
5 is detachably assembled.

In the nozzle shaft 22 and the cap nozzle 23, a coating material flow passage 31, which penetrates vertically,
32 is formed, and the upper end of the nozzle shaft 22 is
The flexible tube 33 is connected to the tip of the passage portion 13 a of the syringe 13. In addition, the nozzle 1
5, a discharge hole 34 communicating with the flow passages 31 and 32 is formed in the center thereof, and a stopper 35 is provided in the vicinity thereof, and the stopper 35 is located slightly below the opening end of the discharge hole 34. Protruding up to.

As a structure for facilitating the attachment / detachment of the nozzle 15, as shown in FIGS.
A pair of pins 36 are provided on the peripheral wall of 5 to project outward,
On the other hand, the nozzle holder 21 is provided with a pair of engagement grooves 37 corresponding to the nozzles 15. The engagement groove 37 extends in the vertical direction from the lower end of the nozzle holder 21 to a predetermined position above the nozzle holder 21, and is then bent in the circumferential direction, and the tip portion thereof is bent slightly downward. By inserting the pin 36 into the engaging groove 37 from below and turning the nozzle 15, the pin 36 is locked to the tip of the engaging groove 37.

Further, as a structure for fixing and aligning the nozzle 15, as shown in FIG. 6, a taper surface is provided on the tip end portion of the cap nozzle 23 fitted into the nozzle 15 and the nozzle inner wall surface corresponding thereto. While 38 and 39 are formed,
A flange 40 is formed in the vicinity of the upper end of the nozzle shaft 22, and a nut 41 abutting on the flange 40 is screwed to the peripheral surface of the upper end portion of the nozzle holder 21. By tightening the nut 41, the nozzle shaft 2
2 and the cap nozzle 23 are pressed downward so that the tapered surfaces 38 and 39 are in pressure contact with each other.

Further, the elevating and lowering drive means is configured to elevate and lower the coating agent supply section 14 via the lever 46 by the air cylinder 45. That is, the air cylinder 45 is attached to the upper portion of the attachment frame 12, and the intermediate portion of the lever 46, one end of which is pivotally attached to the attachment frame 12 via the shaft 47, is provided below the air cylinder 45 via the shaft 48 and the joint block 49. Connected to the air cylinder 45,
A shaft 50 on the other end side of the lever 46 is engaged with a push block 52 at an upper end of a push rod 51 attached to the attachment frame 12 so as to be able to move up and down. The lever shaft 48, 5
The length between 0 is made larger than the length between the axes 47 and 48,
Depending on the ratio of these lengths (lever ratio), the air cylinder 4
The operation of No. 5 is accelerated and transmitted to the push rod 51. The nozzle block 24 is connected to the lower end of the push rod 51.

Push rod 51 and nozzle block 24
The nozzle block 24 moves up and down as the push rod 51 moves up and down by the operation of the air cylinder 45, and at the lower end, the coating agent supply unit 14
When the tip of the nozzle comes into contact with the printed circuit board, the nozzle block 24 is allowed to move to some extent relative to the push rod 51 according to the reaction force. Specifically, the slide bush 53 is externally fitted to the push rod 51, these penetrate the nozzle block 24, and the flange 54 provided on the slide bush 53 abuts on the upper surface of the nozzle block 24. Then, the fixed positional relationship between the slide bush 53 and the nozzle block 24 with respect to the push rod 51 is elastically held by the springs 55 and 56.

Reference numeral 57 is a return spring for urging the push rod 51 upward, and 58 is an adjusting screw for adjusting the rising end position.

The height position adjusting means includes a servo motor 61 fixed to the wall 11 of the head unit body 10 and a ball screw shaft 62 connected to the servo motor 61. The screw shaft 62 is rotatably supported by the wall body 11 via a bearing 63 in a state of being arranged in the vertical direction. On the other hand, the mounting frame 12
The guide portion 65 is engaged with a pair of left and right guide rails 66 attached to the wall 11 so as to be vertically movable.
And a nut portion 64 screwed onto the ball screw shaft 62. The mounting frame 12 moves up and down as the ball screw shaft 62 is driven and rotated by the servomotor 61. Reference numeral 67 is a spring as a balancer for reducing the load applied to the screwed portion of the ball screw shaft 62 and the nut portion 64, which elastically supports the mounting frame 12 with respect to the wall body 11. There is.

In addition, the head unit 5 is equipped with a camera 70. The camera 70 is used for detecting fiducial marks and the like on the printed circuit board, confirming the coating point, and inspecting the coating state.

The operation of the dispenser of this embodiment as described above will be described below.

At the time of dispensing work, the printed circuit board is carried into a predetermined position on the base 1 by the conveyor 2, and then the head unit 5 is moved to a predetermined position above the printed circuit board, and then the lever 4 is moved by the air cylinder 45.
The push rod 51 is operated downward via 6 to lower the coating material dispensing portion 14, and when the stopper 35 provided at the tip of the nozzle 15 comes into contact with the upper surface of the printed board, the coating material dispensing portion 14 14 stops. Subsequently, when a positive pressure is applied to the inside of the syringe 13, the coating agent sent from the syringe 13 to the coating agent supply section 14 via the flexible tube 33 is discharged from the tip of the nozzle 15, and It is applied to a predetermined application location.

At this time, the coating amount and the coating state of the coating agent include the clearance C between the opening end of the discharge hole 34 of the nozzle 15 and the coating surface, the coating agent discharge time, the pressure applied in the syringe 13, and the like. Can be adjusted with. Since the clearance C is determined by the protrusion amount of the stopper 35, the protrusion amount of the stopper 35 may be set in advance so that an appropriate clearance C can be obtained.
Further, the coating agent discharge time and the pressing force are controlled on the basis of predetermined coating data by a control means (not shown), and more preferably, feedback control is performed based on the camera 70 imaging the coating state. do it.

After the application of the coating agent, the air cylinder 45
Then, the push rod 51 is actuated upward via the lever 46, whereby the coating agent supply section 14 returns to the raised position, and then the head unit 5 moves to the next coating point. By repeating such an operation, the coating material is applied to each application portion of the printed circuit board.

As described above, in the dispensing operation, the coating agent dispensing section 14 is moved up and down. In this case, the syringe 13 storing the coating agent is fixed to the mounting frame 12, and only the coating agent dispensing section 14 is fixed. It is moved up and down according to the operation of the air cylinder 45. Therefore, the syringe 1
3 is also moved up and down, the inertial force of the coating agent in the syringe 13 is not applied to the inside of the nozzle 15 during the raising and lowering or the stop at the descending end value, and the coating agent caused by the inertial force is not applied. By suppressing variations in the discharge amount and reducing the weight of the lifting portion, downsizing of the lifting driving means,
Also, it is possible to speed up and lower the operation.

In particular, in this embodiment, the air cylinder 45 raises and lowers the coating agent supply portion via the lever 46, and the operation of the air cylinder 45 is accelerated in accordance with the lever ratio. With such a structure, it is possible to speed up and lower the coating agent delivery section 14.

Further, in order to carry out coating, the coating agent supplying section 14
When lowering the servo, if necessary, the servo motor 61
By operating the height position adjusting means including the ball screw shaft 62 and the like, the height position of the mounting frame 12 on which the coating agent supply part 14 and the elevating and lowering driving means are attached is adjusted, and by this, The impact force at the time of contact with the coating surface is properly adjusted. In other words, when the coating material dispensing part 14 descends to reach the contacted surface, the height difference of the contacted surface is absorbed to some extent at the connecting portion of the push rod 51 and the nozzle block 24 as described above. However, if the height position of the abutted surface changes relatively significantly, such as when applying a coating agent to a component on a printed circuit board, the abutting action of the above-mentioned coupling portion alone causes the contact. It is difficult to avoid fluctuation of impact force. Therefore, the height position of the mounting frame 12 is adjusted by the height position adjusting means according to the height position of the contacted surface.

By the way, in the dispenser of this embodiment,
In the coating agent supply section 14, the nozzle holder 21 also provided with a heater 28 and serving as a heating section heats the coating agent passing through the internal flow passages 31 and 32 to a predetermined temperature, and also the coating agent in the syringe 13 is also heated. Since it is heated by the holder 17 that also serves as a heating unit, the application agent is appropriately discharged according to the pressure applied to the syringe 13. That is, although heating the coating agent to a predetermined temperature in the coating agent delivering section 14 has been conventionally performed, when the temperature of the coating agent in the syringe 13 changes, the syringe 1
3 changes the fluidity of the coating agent sent to the coating agent supply section 14 via the flexible tube 33, so that the syringe 13
The ejection amount when the coating material is ejected from the nozzle 15 varies depending on the positive pressure applied inside. On the other hand, if a heating unit is also provided on the syringe 13 side to adjust the temperature as in the present embodiment, the fluidity of the coating agent sent from the syringe 13 to the coating agent supply section 14 is appropriately maintained. As a result, the stability of the ejection amount adjustment is enhanced. Moreover, since the holder 17 for the syringe 13 is also used as the heating unit, the above-described operation can be obtained with a simple structure.

Further, the coating agent supply section 14 has a structure advantageous for assembling and maintenance.

That is, when the nozzle 15 is attached, the pin 36 provided on the nozzle 15 is engaged with the engagement groove provided on the nozzle holder 21 while the nut 41 at the upper end of the coating agent supply section 14 is loosened in advance. The pin 36 is locked to the tip of the engaging groove 37 by inserting it into the nozzle 37 from below and rotating the nozzle 15, so that the nozzle 1 can be pushed with one touch.
Temporary fixing of 5 is performed. Then, by tightening the nut 41 in such a state, the nozzle shaft 22
Also, the cap nozzle 23 is pressed downward, and the tapered surface 38 of the tip of the cap nozzle 23 is pressed against the corresponding tapered surface 39 of the inner wall surface of the nozzle 15, thereby fixing and aligning the nozzle 15 simultaneously. Be seen.

In this way, the nozzle 15 can be easily and accurately attached, and the nozzle 15 can be easily attached and detached for maintenance and the like.

Further, when removing the nozzle assembly of the coating agent supply section 14 for maintenance or the like, first, the nozzle 15 is removed, and the bolts 27 on both sides of the nozzle holder 21 are removed, and then the nozzle holder 21 and the like are moved upward. The nozzle assembly can be easily removed from the nozzle block 24 by pulling it out.

[0042]

As described above, in the dispenser of the present invention, the syringe for storing the coating agent is fixed to the head unit main body, while the coating agent supply part is attached to the head unit main body so that it can be moved up and down. Since the coating agent delivery section and the syringe are connected via a flexible tube, and only the coating agent delivery section is moved up and down by the elevating drive means, the inertial force applied to the inside of the coating agent delivery section at the time of elevating It is possible to reduce the variation in the discharge amount and the like, and to reduce the size of the lifting drive means and increase the speed of the lifting operation.

In this dispenser, if an air cylinder is used as the elevating and lowering drive means, it is possible to elevate and lower the coating agent supply section with a simple structure. In particular, by providing a lever that accelerates the operation of the air cylinder and transmits it to the coating agent dispensing section, it is possible to speed up and lower the operation with a simple structure.

Further, the coating agent dispensing section and the elevating and lowering driving means are attached to a mounting frame provided on the head unit main body so as to be vertically movable, and the height position of the coating agent dispensing section is adjusted by vertically moving the mounting frame. When the height position adjusting means is provided, the elevating drive means moves up and down the coating agent supply part, and the rising and lowering positions are adjusted by the height position adjusting means according to the height of the coated surface. It is possible to properly adjust the impact when reaching the surface to be coated.

[Brief description of drawings]

FIG. 1 is a schematic front view of a dispenser according to an embodiment of the present invention.

FIG. 2 is a front view of the head unit of the dispenser.

FIG. 3 is a vertical sectional side view taken along the line III-III of FIG. 2;

FIG. 4 is a right side view of the head unit.

FIG. 5 is a plan view of a head unit.

FIG. 6 is an enlarged vertical side view of the main part at the same cross-sectional position as in FIG.

FIG. 7 is an enlarged vertical sectional front view of a front end side portion of a coating agent dispensing section.

[Explanation of symbols]

 1 Base 5 Head Unit 10 Head Unit Main Body 12 Mounting Frame 13 Syringe 14 Coating Agent Dispensing Part 15 Nozzle 33 Flexible Tube 45 Air Cylinder 46 Lever 61 Servo Motor 62 Ball Screw Shaft

Claims (4)

[Claims] 1. A coating head unit for dispensing, which is provided above a base, stores a coating agent and has a nozzle at a tip and discharges the coating agent sent from the syringe from the nozzle. In a dispenser that is equipped with an agent supply section and applies the coating agent to a predetermined portion of the printed circuit board, the syringe can be fixed to the head unit body while the coating agent supply section can be moved up and down with respect to the head unit body. Mounted on the syringe and the syringe is connected to the syringe through a flexible tube for conducting the coating agent, and an elevating and lowering drive means for raising and lowering the coating agent delivery section is provided. Dispenser in the system. 2. The dispenser in the component mounting system according to claim 1, wherein the elevating and lowering drive means elevates and lowers the coating agent supply section by an air cylinder. 3. The dispenser in the component mounting system according to claim 2, wherein the lifting drive means is provided with a lever for accelerating the operation of the air cylinder and transmitting it to the coating agent supply section. 4. The head unit main body is provided with a vertically movable mounting frame, and the mounting frame is provided with the coating agent supply section and an elevating and lowering drive means for raising and lowering the coating section, and the coating is performed by vertically moving the mounting frame. The dispenser in the component mounting system according to any one of claims 1 to 3, further comprising height position adjusting means for adjusting a height position of the agent delivering portion.