JP2000126662A - Coating agent feeding part structure of dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the wear of an abutted part of the opening peripheral edge of a nozzle subjected to rotary driving by a rotary driving means and the tip of a needle in a coating agent feeding part of a dispenser. SOLUTION: A coating head for a dispenser installed above a base is provided with a syringe for storing a coating agent, a coating agent feeding part having a rotatable nozzle 23 and for discharging the coating agent fed from the syringe from the nozzle 23, and a rotary driving means for rotating the nozzle. The coating agent feeding part is provided with a needle 35 positioned in a coating agent flow passage communicating with the nozzle 23 and for opening and closing the nozzle 23, and an air cylinder 36 for reciprocating the needle 35. The needle 35 is freely rotatably connected to a piston 37 in the air cylinder 36 through bearings 42, 43.

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 a coating material such as an adhesive to a substrate in a component mounting system, and more particularly to a structure of a coating material supply section having a needle for opening and closing a nozzle.

[0002]

2. Description of the Related Art Conventionally, in a mounting system for mounting an electronic component on a substrate, a dispenser is usually provided in front of a mounter for mounting the component, and an adhesive or a cream solder for fixing the electronic component is used. Can be applied to the substrate.

[0003] This type of dispenser has a coating head above a base. The coating head has a syringe for storing a coating agent, and a nozzle at the tip, and the coating agent sent from the syringe is supplied to the nozzle. An application agent supply unit to be discharged from is provided.

When dispensing, first, the coating head is positioned above the coating position on the substrate, and the coating agent is discharged from the nozzle in a state where the coating head is lowered so that the tip of the nozzle contacts the coating surface. An application agent is applied to the substrate.

As the internal structure of the coating material supply section, there is known an internal structure in which a needle is disposed in a coating material flow passage leading to a nozzle, and the nozzle is opened and closed by the needle. That is, when the needle is reciprocated up and down by the air cylinder, and the tip is in contact with the periphery of the opening on the coating agent inflow side of the nozzle when the needle is in the lowered position, the nozzle closes the nozzle, The nozzle is opened by separating from the peripheral edge of the opening, and the coating agent is pushed out of the nozzle when the needle moves from the rising position to the lowering position.

[0006] In addition, when the nozzle has a plurality of nozzle holes, for example, in order to adjust the rotation angle according to the application location, usually, the main body side (such as a nozzle block) of the application agent supply section.
, And is rotatably driven by rotation driving means such as a servomotor.

[0007]

In the case where the nozzle is rotatable as described above and the needle is driven by an air cylinder to open and close the nozzle, the peripheral edge of the nozzle opening and the tip of the needle are disposed. There is a problem that abrasion tends to occur in the abutting portion.

That is, in this type of conventional device,
The needle is fixed to the piston of the air cylinder,
It has a structure that does not rotate, and presses against the opening edge of the nozzle with a relatively large force in order to reliably prevent leakage of the coating agent when the nozzle is closed. Therefore, when the nozzle is driven and rotated by the rotation driving means in this state, the contact portion between the opening edge of the nozzle and the tip of the needle is rubbed with a relatively large force, and these portions are easily worn. Become. And abrasion of these parts may cause problems such as deterioration of sealing performance.

SUMMARY OF THE INVENTION The present invention solves such a problem, and dispenses a coating material for a dispenser capable of preventing abrasion of a contact portion between a peripheral edge of an opening of a nozzle rotatably driven by a rotary driving means and a needle tip. The purpose is to provide a part structure.

[0010]

To achieve the above object, the present invention provides a dispensing coating head provided above a base, comprising a syringe for storing a coating agent and a rotatable nozzle. An application agent supply unit that ejects the application agent sent from the syringe from the nozzle, and a rotation driving unit that rotates the nozzle, the application agent supply unit includes:
In a dispenser provided with a needle positioned in the coating agent flow passage leading to the nozzle to open and close the nozzle, and a driving device for reciprocatingly driving the needle, the needle is rotatably connected to the driving device. Things.

According to this structure, when the nozzle is driven to rotate while the tip of the needle is in contact with the peripheral edge of the opening of the nozzle and the nozzle is closed, the needle rotates together with the nozzle, and the abrasion of the contact portion is reduced. Will be prevented.

In the present invention, for example, a cylinder may be used as a driving device for reciprocatingly driving the needle. When a cylinder is used, it is provided in the application agent supply section, and the large-diameter head provided at the end of the needle is accommodated in a hollow section provided in a piston in the cylinder, and the head is provided in the hollow section. Bearings may be provided on both sides of the. With this configuration, the needle can be rotatably connected to the piston with a relatively simple structure.

[0013]

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

FIG. 1 shows an overall configuration of a dispenser to which the present invention is applied. In the figure, conveyors 2 and 2 for transporting substrates are arranged on a base 1 of a dispenser, and a substrate (not shown) is transported on the conveyors 2 and 2 so as to stop at a predetermined coating position. Has become.

On the base 1, a pair of rails 3, 3 are extended in the Y-axis direction, and a head support member 4 is mounted on the rails 3, 3, and the Y-axis servo motor 5 controls the Y-axis.
It can be moved in the axial direction. An application head 6 is mounted on the head support member 4. The application head 6 can be moved in the X-axis direction with respect to the head support member 4 by an X-axis servo motor 7 provided on the head support member 4. Has become.

FIGS. 2 and 3 show the structure of the coating head 6, and a coating device D is mounted on the coating head 6. FIG. The coating device D includes a syringe 17 for storing a coating agent.
And a coating agent supply unit 20 having a rotatable nozzle 23 and discharging the coating agent sent from the syringe 17 from the nozzle 23, such that an adhesive or the like is applied to a predetermined application position on the substrate. Has become. In the illustrated example, two sets of coating apparatuses D each including a syringe 17 and a coating agent supply section 20 are provided in parallel.

Further, Z for moving up and down the coating device D
The coating head 6 is equipped with an elevating / lowering drive unit including the axis servomotor 9 and the like, and a rotation drive unit including an R-axis servomotor 27 for rotating the nozzle 23 and the like.

The structure of the coating head 6 will be described in more detail. A Z-axis servomotor 9 is fixed to the installation plate 8 of the coating head 6.
The ball screw shaft 10 is connected to the drive shaft. The ball screw shaft 10 has an upper bearing 11 and a lower bearing 1
2 rotatably supported. Further, a pair of guide rails 8a is formed on the mounting plate 8,
A guide portion 13 that moves up and down along the guide rail 8a.
Is provided with a nut portion 14 to be screwed to the ball screw shaft. At the front side of the nut portion 14, a mounting frame 15 for fixing the coating device D is provided.

Therefore, when the Z-axis servomotor 9 is rotated, the nut portion 14 screwed with the ball screw shaft 10 moves up and down along the guide rail 8a, and the nut portion 14 is attached to the mounting frame 15 and the mounting frame 15 accordingly. The application device D moves up and down.

A coating material supply section 20 is mounted on the front side of the mounting frame 15, and a syringe 17 is mounted on a front upper side of the mounting frame 15 via a holder 16.
A discharge section 18 is integrally formed at the lower end of the syringe 17, and the discharge section 18 is connected to a nozzle block 21 of an application agent supply section 20 via a pipe 19. Note that the syringe 17 is connected to a pressurizing unit and a depressurizing unit via a valve and a regulator (not shown). When a dispensing process is performed, the pressure in the syringe 17 is increased by the pressurizing unit, whereby the coating is performed. The agent is extruded. On the other hand, when the dispensing process is not performed, the pressure inside the syringe 17 is reduced by the pressure reducing means.
The leakage of the coating agent is prevented.

The coating material supply section 20 includes a nozzle holder 22 below a nozzle block 21, and a nozzle 23 is attached to a tip of the nozzle holder 22.
The nozzle holder 22 is rotatably supported by the nozzle block 21 and the mounting frame 15 via bearings 24 and 25. A pulley 2 is provided on the outer periphery of the nozzle holder 22.
6 are provided.

At the side of the coating material supply section 20, a mounting frame 1 is provided.
5, an R-axis servomotor 27 attached to the
The pulley 28 provided on the drive shaft of the R-axis servomotor 27, the pulley 26 of the nozzle holder 22 and the belt 2
9, the nozzle holder 22
The nozzle 23 is driven to rotate by an R-axis servomotor 27.

FIG. 4 shows the internal mechanism of the coating material supply section 20. As shown in this figure, the nozzle shaft 30 is connected to the nozzle block 21 and the nozzle block 2
1 and a nozzle shift 30, a coating material flow passage 31 is formed. The coating material flow passage 31 communicates with the pipe 19 via a coating material introduction port 32, and
The coating material sent from 7 is introduced into the coating material flow passage 31. The nozzle shaft 30 passes through the inside of the nozzle holder 22. A heating means 33 is arranged around the nozzle holder 22.

Further, a needle 35 having a function of opening and closing the nozzle 23 and pushing out the coating material, and a driving device for reciprocatingly driving the needle 35 are provided inside the coating material supply section 20, and the driving device is, for example, air. Cylinder 3
It consists of six. The needle 35 is provided in the coating material flow path 3.
1, its lower end extends below the nozzle shaft 30 to reach a position facing the nozzle 23, and its upper end extends above the nozzle block 21.

The air cylinder 36 is provided above the nozzle block 21. A piston 37 is disposed inside the air cylinder 36, and air chambers 38, 39 are formed on the upper and lower sides of the piston 37, and these air chambers 38, 39 are connected via ports 40, 41. Each air chamber 38, 39 is connected to an external air circuit.
The supply and exhaust of air to and from the piston 37
Is moved up and down. The upper end of the needle 35 is connected to the piston 37.

In particular, as a feature of the present invention, the needle 35 is rotatably connected to the piston 37 via bearings 42 and 43. The structure of this part is specifically as follows.

At the upper end of the needle 35, a head 35a having a larger diameter than other parts is provided.
7, a hollow portion 37a for accommodating the head portion 35a is formed, and a needle insertion hole 37b having a smaller diameter than the hollow portion 37a is formed below the hollow portion 37a. Then, the needle 35 is inserted through the needle insertion hole 37b, and
The upper opening of the hollow portion 37a is closed by a plug 44 in a state where the head 35a of the needle 35 is accommodated in 7a, and the plug 44 is screwed to the piston 37.

Bearings 42 and 43 are disposed on the upper and lower sides of the head 35a of the needle 35 in the hollow portion 37a. That is, the lower step portion and the hollow portion 3 of the head 35a
A bearing 42 is interposed between the bottom of 7a and a bearing 43 between the upper surface of the head 35a and the plug 44. Reference numeral 45 denotes an adjusting member for adjusting the vertical stroke of the piston. .

FIG. 5 shows the structure of the tip side portion of the coating material supply section 20. That is, a cylindrical cap nozzle 47 is fitted to the tip of the nozzle shaft 30, and the nozzle 23 is fitted to the tip of the cap nozzle 47. In this state, the nozzle 23 is screwed to the tip of the nozzle holder 22. The nozzle 23 is fixed by the fixing member 50.

The nozzle 23 is provided with a through hole 48 communicating with the coating material flow passage 31, into which a nozzle tip 49 having one or more nozzle holes is press-fitted.

In the dispenser of the present embodiment as described above, in the dispensing process, when the substrate is transported to a predetermined position on the base 1 by the conveyor 2, first, the coating head 6 moves to the coating position above the substrate. Next, the Z-axis servomotor 9 rotates to lower the mounting frame 15, thereby lowering the coating material supply unit 20. Then, the lowering of the mounting frame 15 is stopped when the tip of the nozzle 23 provided in the coating material supply section 20 comes into contact with the substrate.

At this time, the inside of the syringe 17 is in a pressurized state, and the coating agent is supplied from the syringe 17 to the coating agent supply section 20 via the connection pipe 19. Next, when the air cylinder 36 operates to raise the needle 35, the needle 35 opens the through hole 48 of the nozzle 23 and sucks a predetermined amount of the coating material into the flow passage below the needle.

Next, the air cylinder 36
5 to lower the needle 3
After the extruding agent 5 is pushed out from the nozzle hole and discharged from the nozzle hole, the tip of the needle 35 abuts on the peripheral edge of the opening of the through hole 48 of the nozzle 23 to close this opening.

By the way, at a stage before the application agent is discharged, the nozzle 23 is rotated by a predetermined rotation angle when necessary according to the application location of the substrate, that is, the R-axis servomotor 27 is driven. As a result, the nozzle holder 22 and the nozzle 23 are rotated via the belt 29. At this time, the tip of the needle 35 is in contact with the peripheral edge of the opening of the through hole 48 of the nozzle 23 on the coating material inflow side, but the needle 35 is rotatable with respect to the piston 37 of the air cylinder 36 via the bearings 42 and 43. Therefore, wear is prevented.

That is, if the structure is such that the needle is fixed to the piston of the air cylinder and does not rotate as in the prior art, the rotation of the nozzle causes the contact portion between the opening edge of the through hole of the nozzle and the tip of the needle. Abrasion is likely to occur at the tip of the needle and at the periphery of the opening of the nozzle. However, if the needle 35 is rotatable as in this embodiment, the needle 35 rotates together with the nozzle 23, so that friction is avoided and wear is suppressed. Will be done.

[0036]

As described above, the present invention relates to a dispenser for dispensing a coating material including a nozzle which is rotationally driven by a rotational driving means, a needle which opens and closes the nozzle, and a driving device which reciprocates the needle. In the structure, the needle is rotatably connected to the driving device, so that when the nozzle is driven to rotate while the tip of the needle is in contact with the opening peripheral edge of the nozzle and the nozzle is closed, the needle accompanies the nozzle. By turning, wear of the contact portion can be prevented. Therefore, it is possible to prevent a decrease in sealing performance due to wear and the like, and to enhance the durability.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a dispenser to which the structure of the present invention is applied.

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

FIG. 3 is a partially cutaway side view of the coating head.

FIG. 4 is a sectional view of an internal mechanism of a coating head.

FIG. 5 is an enlarged cross-sectional view of a portion on the distal end side of a coating material supply section.

[Explanation of symbols]

 Reference Signs List 1 base 2 conveyor 6 coating head 17 syringe 20 coating material supply section 23 nozzle 31 coating material passage 35 needle 36 air cylinder 37 piston 42, 43 bearing

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F041 AA05 AB01 BA04 BA05 BA10 BA12 BA34 4F042 AA06 CB02 CB03 CB11 5E319 BB05 CD27

Claims (2)

[Claims] 1. A syringe for storing a coating agent in a coating head for dispensing provided above a base, and a coating agent having a rotatable nozzle and discharging the coating agent sent from the syringe from the nozzle. Dispensing section, comprising a rotation drive means for rotating the nozzle, the coating agent dispensing section,
In a dispenser provided with a needle positioned in the coating agent flow passage leading to the nozzle to open and close the nozzle, and a driving device for reciprocatingly driving the needle, the needle is rotatably connected to the driving device. A dispenser application dispensing part structure, characterized in that: 2. A cylinder as a driving device for reciprocatingly driving a needle is provided at an application agent supply portion, and a large-diameter head provided at an end of the needle is accommodated in a hollow portion provided at a piston in the cylinder. A dispenser application dispenser structure in which bearings are arranged on both sides of the head in the hollow portion.