JP2595493B2 - Liquid discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for discharging a viscous liquid such as a silicone resin or a potting resin.

[0002]

2. Description of the Related Art Conventionally, there has been a liquid discharge apparatus for discharging a liquid (a molten resin or the like) in a dispenser to the outside from a tip end of a nozzle portion.

[0003]

When a liquid is ejected from the tip of the nozzle, a small amount of the liquid remains at the tip of the nozzle due to the viscosity of the liquid. If the liquid material remains in a dripping state at the tip of the nozzle, the next time the liquid is discharged, a predetermined amount of the liquid is supplied from the container to the nozzle, and the dripping residue is also discharged together. In addition, the discharge amount becomes excessive. In addition, the liquid material that has been left attached to the tip of the nozzle may be solidified due to contact with outside air or a decrease in temperature. Then, there is a possibility that the nozzle may be clogged, or the ejection direction and the ejection amount may fluctuate under the influence of the solidified liquid material.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid ejecting apparatus which can stably and accurately eject a liquid by cleaning a tip of a nozzle.

[0005]

To achieve the above object, the present invention provides a liquid material discharging apparatus comprising: a dispenser including a container for storing a liquid material; a nozzle for discharging the liquid material from the container; And an air ejection stage capable of injecting air toward the tip of the section.

[0006] The air injection means is constituted by a nozzle receiver located near the nozzle portion, and an air passage communicating with the nozzle receiver.

[0007]

1 to 4 show one embodiment of a liquid discharging apparatus according to the present invention. This liquid material discharge device has a dispenser A, a second temperature control means B, a first temperature control means C, and an air injection means D. FIG. 1 is a side view and FIG. Is shown. Dispenser A is a hollow cylindrical container portion 1 in which a liquid material is stored.
And a small-diameter nozzle portion 2 provided at the end of the container portion 1 and communicating therewith. The liquid material (the molten resin) in the container portion 1 passes through the nozzle portion 2 by a cylinder mechanism (not shown). It is discharged to the outside. In this embodiment, the nozzle 2 is a needle 2a through which a liquid material flows.
And a pipe 2b located on the outer periphery of the needle 2a. The amount of the liquid discharged by one drive of the cylinder mechanism is set to be always constant at a constant temperature.

A second temperature control means B is provided so as to surround the outer periphery of the dispenser A. Describing the configuration of the second temperature adjusting means B, the inner cylindrical body 3 and the outer cylindrical body 4 are fixed to each other by bolts 5 in a state of being in close contact with each other. A spiral groove is engraved on the outer peripheral surface of the inner cylindrical body 3 (the surface in contact with the outer cylindrical body 4), and is joined to the inner peripheral surface of the outer cylindrical body 4 to form a spiral water pipe 6.
Are formed. The spiral water pipe 6 is formed so as to meander from the upper part of the second temperature control means B to the lower part and then to the upper part again, and a pair of open ends near the upper end of the second temperature control means B. 6a and 6b are provided. Tubes 7a and 7b are connected to the open ends 6a and 6b, and a temperature control fluid (such as heated oil or hot water) flows into the open end 6a from one of the tubes 7a. After falling while meandering, it rises again and flows out of the other open end 6b into the tube 7b. Both cylinders 6
Seal rings 8 are attached to the upper and lower ends of the joints a and 6b.

Below the second temperature control means B and outside the nozzle portion 2 of the dispenser A, the first temperature control means shown in FIG.
Is provided. The first temperature control means C is attached to a lower end of the second temperature control means B, and has a communication end with a nozzle receiver 13 which is formed in a cylindrical shape and has a front end covering the outer periphery of the pipe 2b of the nozzle part 2. (Water pipe)
9. Describing the structure of the communication hole 9, openings 9 a and 9 b are provided on both sides (left and right in FIG. 3) of the nozzle receiver 13, and downward from the openings 9 a and 9 b (toward the tip of the nozzle 2). Pores 9c and 9d are respectively formed toward
c and 9d communicate with both ends of a groove 9e formed on the outer surface of the pipe 2b by a half circumference (left side in FIG. 4). A supply pipe 10a for a temperature controlling fluid is connected to one opening 9a, and a discharge pipe 10b is connected to the other opening 9b. Therefore, the temperature control fluid flows from the supply pipe 10a into the pores 9c through the openings 9a,
After passing around the pipe 2b halfway through the groove 9e, the fine hole 9d
Through the opening 9b to the discharge pipe 10b. As described above, when the temperature control fluid passes through the groove 9e, the liquid material in the needle 2a located inside the pipe 2b is heated or cooled.

In this embodiment, an air injection means D shown in FIG. 4 is provided. The air jetting means D includes the above-described nozzle receiver 13 and the air passage 11. The air passage 11 is provided with the groove 9 e of the nozzle receiver 13.
It is provided on the opposite side (the right side in FIG. 4) from the formation position, and includes an opening 11a and a communication hole 11b communicating the opening 11a with the inside of the pipe 2b. Opening 11
The air supply pipe 12 is connected to a. Therefore,
The air supplied from the air supply pipe 12 through the opening 11a enters the inside of the pipe 2b after passing through the flow hole 11b, and has an annular shape formed between the inner peripheral surface of the pipe 2b and the outer peripheral surface of the needle 2a. It is jetted downward in the gap.

The operation of the above embodiment will be described below. A liquid (eg, a silicone resin or a potting resin in a molten state) to be discharged is stored in the container 1a of the dispenser A in advance, and a fluid of a predetermined temperature (a By circulating oil or hot water, the temperature in the container is kept constant and the viscosity of the liquid material is kept constant. At the same time, the first temperature control means C
The same temperature adjusting fluid as that supplied to the helical water pipe 6 is circulated through the communication hole 9. In such a state, a cylinder mechanism (not shown) is driven, and the liquid material in the container 1 is
The liquid passes through the needle 2a of the nozzle portion 2 and is discharged from a tip thereof onto a substrate (not shown). By the temperature adjusting fluid circulating in the communication hole 9, the liquid material passing through the needle 2a is kept at a constant temperature and does not change in viscosity until immediately before the discharge, so that the same amount can be always discharged under the same conditions.

When the discharge of the liquid material is completed by the above-described process, the dispenser A is moved to a cleaning position provided at a position distant from the substrate mounting position, and an air passage is provided through an air supply pipe 12 by a pump (not shown) or the like. Air is supplied to 11. If the liquid material remains without being completely discharged from the tip of the needle 2a and becomes solid or solid with the liquid material attached, the air passage 1
The liquid remaining at the tip of the needle 2a is blown off and dropped by the air ejected from 1 and discharged downward in the gap between the outer peripheral surface of the needle 2a and the inner peripheral surface of the pipe 2b. Thereby, it is possible to prevent defects such as nozzle clogging and variations in discharge amount and discharge characteristics caused by the liquid material adhering to the tip of the needle 2a. In performing the actual work, it is set so that air injection is always performed at the start or end of the work, or air injection is performed periodically after performing a predetermined number of discharges of the liquid material.

In the present invention, the air injection means D is configured to blow air from the not-shown air pump or the like to the tip of the nozzle portion 2 through the fine air passage 11. In this embodiment only
It is not specified.

The first and second temperature control means B,
The configuration of C is not particularly limited, and is appropriately set according to the type of the liquid to be discharged, the working environment, and the like. In the case of using the temperature adjusting fluid as in the above embodiment, the temperature of the liquid can be freely adjusted by arbitrarily setting the temperature of the fluid. For example, in the above embodiment, heated oil or the like is supplied to the communication hole 9 to supply the nozzle 2
However, when a hot plate is used, the heat of the hot plate may be transmitted to the nozzle portion 2 and become high, so that cold water is supplied to the communication hole 9 or the like. Contrary to the embodiment, it is used for suppressing the temperature rise of the liquid material.

The temperature control means B and C are not limited to those using a fluid. When heating is performed, a heating wire is provided around the outer periphery of the container portion 1 or the nozzle receiver 13, or when cooling is performed. Various configurations such as a configuration using a Peltier element (semiconductor heat exchange element) can be adopted.

In the above embodiment, the second temperature control means B and the first temperature control means C are completely independent of each other. For example, the temperature control fluid circulated through the helical water pipe 6 is directly connected to the communication hole. It is also possible to adopt a configuration in which the two are connected, such as supplying them to the power supply 9.

[0017]

According to the liquid ejecting apparatus of the present invention, since air can be ejected toward the tip of the nozzle by the air ejecting means, the liquid attached to the tip of the nozzle remains. It is possible to prevent defects such as clogging and variations in the discharge amount and the discharge direction by blowing off the object, and it is possible to always obtain stable discharge characteristics.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a liquid discharge device according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

 Reference Signs List A Dispenser D Air injection means 1 Container part 2 Nozzle part 11 Air passage 13 Nozzle receiver

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-97060 (JP, A) JP-A-60-3200 (JP, A) JP-A-59-219983 (JP, A) JP-A-58-1983 199069 (JP, A) JP-A-58-89966 (JP, A) JP-A-54-72974 (JP, A) JP-A-54-58360 (JP, A) JP-A-2-20977 (JP, U) Japanese Utility Model No. 1-128870 (JP, U) Japanese Utility Model No. 1-61972 (JP, U) Japanese Utility Model No. 62-14076 (JP, U)

Claims (1)

(57) [Claims] 1. A dispenser including a container for storing a liquid material, a nozzle for discharging the liquid from the container, a nozzle receiver positioned near the nozzle, and the nozzle.
And an air passage communicating with the receiver,
A liquid ejecting apparatus comprising: an air ejecting unit capable of ejecting air toward a tip of the nozzle unit.