JPH08131813A - Viscous fluid supply device - Google Patents

Abstract

(57) [Summary] [Purpose] When applying a viscous fluid such as an adhesive, the distance between the tip of the needle and the work can be optimized, and the viscosity of the adhesive accommodated in the syringe also decreases. A viscous fluid supply device that can be applied on a work and extended to an adhesive state. [Structure] A needle 9 of a syringe 1 attached to a shaft 2a that moves in a vertical direction with respect to a work W is filled with a viscous fluid such as an adhesive, and the work surface is made to approach and separate from the work surface. In the viscous fluid application device, means 12 for sensing the contact position between the tip of the needle 9 of the syringe 1 and the surface of the work W, and drive means for moving the needle 9 or the work W up and down relatively. Means for controlling the drive means. Further, a means for heating the needle 9 is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous fluid supply device used in the work of adhering parts to each other when assembling electronic devices such as detectors, and in particular, an adhering device for adhering parts to each other with high accuracy. Apply the agent to the work,
The present invention relates to a viscous fluid supply device for supplying grease with high viscosity to a work.

[0002]

2. Description of the Related Art When assembling precision equipment, electronic equipment, etc., it is often the case that the parts are soldered together and then bonded together with an adhesive which is a viscous fluid. Although there are various kinds of adhesives depending on the type of parts to be bonded and the purpose of use, the bonding work is usually performed by inserting the adhesive into the syringe 1 as shown in FIG. −
An adhesive is applied little by little to the work W at a predetermined distance h to bond the other works. In this case, the distance h between the tip of the needle 9 and the work W is optimally about 1/2 of the inner diameter of the needle 9, but the type and viscosity of the adhesive, the material of the work W, etc. Also depends on.

Since most of the above-mentioned adhesives have a high viscosity at room temperature, when applying the adhesives, a work W is placed on and held by the pillars 41 of the hot plate 40 as shown in FIG. The work W is sandwiched by jigs 42 and 43 to raise the temperature of the adhesive surface to a certain temperature, and then the adhesive is applied to the work W.
I stretched out the adhesive and glued the other work. Although not shown, the work W may be warmed with a ribbon heater to apply the adhesive.

[0004]

The syringe 1 containing the adhesive is held by a robot movable in the X, Y, and Z directions to apply the adhesive to the work W. The work W and the syringe are used. The distance from the tip of the needle 9 of No. 1 is the machining accuracy of the work W and the work.
The accuracy of the height of the table (working table) on which the work W is installed varies, and the viscosity of the adhesive and the shape of the work vary. When the straight line or circle for adhesion is drawn on the work W with the adhesive because the distance from the tip is too wide, "liquid break" may occur and a defective part may be formed at the adhesion part.

Usually, many adhesives have high viscosity, and as described above, the work W itself has various types such as a long shape and a short shape. A large-scale device is required to raise the temperature of the above and further raise the temperature of the adhesive coated surface. When the temperature of the adhesive surface is increased according to the shape of the work W, the heating method using the hot plate 40 cannot be said to be efficient. Further, if the viscosity is high, a high pressure must be applied to the syringe 1 and it becomes difficult to drop an appropriate adhesive.

The present invention has been made in view of the above problems, and when applying an adhesive which is a viscous fluid to a work, the distance between the tip of the needle for dropping the adhesive and the work is set. The distance can be optimized for the work and bonding conditions, and the viscosity of the adhesive contained in the syringe is also reduced,
It is an object of the present invention to provide a viscous fluid supply device which can reduce the pressure applied to a syringe and can be applied to a work and extended to an adhesive state.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a needle of a syringe attached to a shaft which is filled with a viscous fluid such as an adhesive and moves vertically relative to a work. In the viscous fluid supply device in which the driving means is used to bring the work surface and the work surface closer to each other, a means for sensing the contact between the tip of the syringe needle and the work surface, and the needle or work are provided. It is characterized in that it is provided with a driving means for relatively moving up and down, and a means for controlling the driving means. The means for sensing the contact between the needle tip of the syringe and the work surface is such that when the work is a conductor, one lead wire is connected to the syringe needle and the other lead wire is connected. Is a conductive checker provided with two lead wires connected to the work. Further, the means for sensing the contact between the needle tip of the syringe and the work surface is an optical sensor. Alternatively, in a viscous fluid supply device in which viscous fluid such as an adhesive is placed and a needle of a syringe attached to a shaft that moves in a vertical direction relative to a work and a work surface are moved closer to and separated from each other by a driving means. And a means for heating the needle of the syringe.

[0008]

If the viscous fluid supply device is used as the above-mentioned means, the distance between the work W and the tip of the needle 9 is optimal at each time even if the work W is changed or the table 10 is changed. You can flexibly adapt to the distance. In addition, by virtue of the means, the viscosity of the viscous fluid such as the high-viscosity adhesive in the needle 9 of the syringe 1 is lowered and the needle 9 easily comes out from the tip of the needle 9, so that the viscous fluid can be applied without running out. You can

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the viscous fluid supply device of the present invention. Reference numeral 1 is a syringe having an adhesive (an adhesive is taken as an example of a viscous fluid for description) therein, and is attached to a column 5 which moves up and down with respect to the Z axis 2 (driving means is not shown). Is attached through. The Z-axis 2 can move on a Y-axis 3 which is arranged in a direction perpendicular to the plane of the drawing, and the Y-axis 3 can move along the X-axis
The top can be moved in the left-right direction of the drawing. The syringe 1
The adhesive is supplied from the dispenser 7 containing the adhesive by applying a predetermined pressure with a pipe 8. Also, the downward table 1 of the needle 9 of this syringe 1
A work W for applying an adhesive is installed on the surface of the zero. The work W can be appropriately pressed by the pressing tool 11 to change the bonding position. The syringe 1 side may be fixed (immovable) and the table 10 on which the work W is placed may be moved up and down. That is, the needle 9 of the syringe 1 and the work W are vertically moved relative to each other.

Reference numeral 12 in FIG. 1 is a continuity checker, which has a mechanism for detecting an electric current when two lead wires 13 and 14 are connected and the tip portions simultaneously contact a conductor. One lead wire 13 of the continuity checker 12 is connected to the needle 9 of the syringe 1, and the other lead wire 14 is connected to the pusher 11 of the work W. In this embodiment, the needle 9, the work W, and the pressing tool 11 are made of an electrically conductive material, and the continuity checker 1 is used.
Reference numeral 2 is connected to a control means (not shown) for controlling the vertical movement of the pillar 5 of the Z axis 2.

Next, the operation of the above configuration will be described. (1) First, the pushing tool 11 of the work W and the support 2a of the Z-axis 2
Continuity checker 1 between the needle 9 of the syringe 1 attached to the
Connect the work W with the lead wires 13 and 14 of the second pusher 1
Press 1 to decide the adhesion position. In this case, the pushing tool 11 may push the work W from both sides. (2) Lower the support column 5, which is the control axis in the height direction of the needle 9 of the syringe 1, toward the work W, and place the tip of the needle 9 in the work W.
Get closer to. (3) Work W when the work W comes into contact with the tip of the needle 9
It is confirmed by the conductivity checker 12 that a current flows between the needle 9 and the needle 9. (4) At this time, it is determined that the work W has come into contact with the tip of the needle 9, and the current position of the support column 5 when the current flows is set to 0. From that position, the work W and the tip of the needle 9 are set. The column 5 is raised so that and are at an optimum distance for applying the adhesive. (5) When the optimum position intended for applying the adhesive is reached, the support 5 of the Z-axis 2 is stopped, and the Y-axis 3 and the X-axis 4 are driven at that position to form the adhesive in the required shape. Apply by dropping. As described above, according to the viscous fluid supply device of the present invention, the distance between the work W and the tip of the needle 9 is optimal at each time even if the work W is changed or the table 10 is changed. You can flexibly adapt to the distance. In some cases, the needle 9 may be stopped and the work W may be moved up and down.

FIG. 2 is a diagram showing a modified example of the viscous fluid supply apparatus of the present invention. That is, in this embodiment, the end of one lead wire 13 of the continuity checker 12 is attached to the table 12 itself on which the work W is installed, or the needle 9 on the side of the syringe 1 or the attachment of a conductor for contacting the needle 9 is attached. It is connected to the tool 6 (a conductor that is in contact with the needle 9) and the end portion 14a of the other lead wire 14 is embedded. Just put the work W on the lead wire 14
If the terminals 14a of the
This is convenient when the adhesive is applied to the mask one after another.

In the above embodiment, the conductive checker 1 is used when the work W or the needle 9 of the syringe 1 is made of a non-conductive material.
2 cannot be used. FIG. 3 shows an embodiment in which the work W or the like is made of a non-conductive material. That is, a holder 17 having a light source (light emitting element) 15 for projecting light in the work W direction is attached to the tip of the column 5 that moves up and down on the Z axis 2.
A light-receiving element 16 is installed on the side of the work W that is opposed to the work W at substantially the same surface position as the work W. In this case, the distance between the tip of the needle 9 of the syringe 1 containing the adhesive and the light source (light emitting element) 15 is set to a constant value h. In order to make the distance between the work W and the tip of the needle 9 the optimum distance for applying the adhesive, the following operation is performed. (1) The support column 5, which is a control axis in the height direction of the needle 9 of the syringe 1, is lowered toward the work W. At this time, the holder 17 that holds the light source (light emitting element) 15 also descends at the same time. (2) The moment the light receiving element 16 receives the light from the light source (light emitting element) 15, this light is blocked by the work W.
At this moment, the distance between the tip of the needle 9 and the work W is h.
Based on this position, the amount of lowering of the column 5 is controlled. (3) That is, assuming that the distance d between the work W and the tip of the needle 9 is the optimum position for applying the adhesive, the support 5 is further lowered from the reference position by (hd).

In FIG. 3, a holder 17 having a light source (light emitting element) 15 for projecting in the work W direction is fixed at a fixed position of the Z-axis 2, and the support column 5 is lowered to make the tip of the needle 9 work. W
Since the needle 9 shields the light at the same time when the needle 9 comes into contact with this, this position may be set to "0", and then the column 5 may be raised so that the distance between the needle 9 and the work W becomes the optimum position.

As the optical sensor, the optical sensor which receives the reflected light of the projected light and measures the distance to the reflecting object is used to determine the distance between the work W and the needle 9 as the optimum distance for applying the adhesive. May be set. That is, as shown in FIG.
The optical sensor 18 is attached to the column 5 of the Z-axis 2 that vertically moves the syringe 1 containing the adhesive so that the optical sensor 18 is at the same height as the tip position of the needle 9 of the syringe 1. In order to make the distance between the tip of the needle 9 of the syringe 1 and the work W a proper adhesive application distance, first the column 5 is lowered and at the same time as the needle 9, the optical sensor 18 is moved.
Also keep a certain distance from the work W (usually 20
~ 50mm is common). This position is "0". Next, the support 5 of the Z-axis 2 is raised, but at this time, the optical sensor 1
8 itself measures the distance from the surface of the work W, and the control device controls so that the distance from the work W becomes an appropriate distance for applying the adhesive. When the optical sensor 9 interferes with the adhesive application work, the shaft 19 to which the optical sensor 9 is attached may be rotated.

Next, a description will be given of an embodiment in which a high-viscosity adhesive is dropped in a smooth manner from the tip of the needle 9 of the syringe 1. In FIG. 5, an adhesive is put in the syringe 1, but the adhesive is appropriately supplied from the dispenser 7. In the vicinity of the central portion of the needle 9 of the syringe 1, a tube 20 having a gas discharge port 20a for air or nitrogen gas is located. Further, a pressure regulator 21, a needle valve 22 and an electromagnetic valve 23 are provided in the pipe 20,
Furthermore, a hot hose 24 for heating a part of the tube 20 is arranged. This pipe is connected to a cylinder (which may be a pump) of air or nitrogen gas (not shown).

In the above structure, when the needle 9 of the syringe 1 is warmed, the gas such as air discharged from the cylinder is decompressed and the flow rate is adjusted through the pressure regulator 21 and the needle valve 22 to heat the periphery of the pipe 20. The heated air (hot air) is applied to the needle 9 of the syringe 1 through the hot hose 24 having a means for applying the adhesive. When the warmed air or the like is blown onto the needle 9, the viscosity of the high-viscosity adhesive in the needle 9 is lowered and the needle 9 easily comes out from the tip of the needle 9. Further, if the electromagnetic valve 23 is controlled so that the warmed air or the like hits the work W at an arbitrary timing, it is possible to preheat the adhesive surface of the work. As a heating means for heating the pipe 20 of the hot hose 24, a heater wire or hot water can be used. If the hot plate 40 (see FIG. 8) described above is used in combination with the warming device for the needle 9, the work can be warmed to a temperature sufficient to spread the adhesive even when the temperature of the work W is low. Even if you can't do it, you can adapt the work W and the adhesive.

FIG. 6 shows the needle 9 without using air or nitrogen gas.
Show how to warm. That is, the heat wire 30 is spirally arranged around the needle 9 of the syringe 1, and the heat wire 30 is controlled in current by a controller (not shown) so that the high-viscosity adhesive is easily discharged from the needle 9. You may do it. In particular, it is suitable when the air tube 20 cannot be arranged around the needle 9 or when it is necessary to prevent the generation of dust due to air or the like.

The embodiment of the viscous fluid supply device of the present invention is as described above, and the case of applying a viscous adhesive to the work has been mainly described. However, this device is not limited to the adhesive but a cream solder. Alternatively, it can be carried out when a high-viscosity grease is applied.

[0020]

According to the viscous fluid supply apparatus of the present invention described in detail above, when applying a highly viscous fluid such as an adhesive to a work, the flatness of the work and the work are installed. Do it
Regardless of the processing accuracy of the bull, the distance between the tip of the needle onto which the adhesive is dropped and the work can be always set as the optimum distance for the work and the bonding conditions. Also, adhesives and greases having various viscosities can be dropped in an optimum state according to the purpose of the adhesion. Further, the viscosity of the viscous fluid contained in the syringe can be lowered, and the application can be performed efficiently and stably without causing the liquid to run out and regardless of the shape of the work. Further, since the pressure applied to the syringe can be lowered, the viscous fluid can be supplied onto the work without difficulty.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of a viscous fluid supply device of the present invention.

FIG. 2 is a diagram showing another embodiment of the viscous fluid supply device of the present invention.

FIG. 3 is a view showing an embodiment of the viscous fluid supply device of the present invention when the work and the syringe support are non-conductors.

FIG. 4 is a view showing an embodiment of the viscous fluid supply device of the present invention when the work and the syringe support are non-conductors.

FIG. 5 is a diagram showing an example in which a high-viscosity adhesive is dropped in a smooth manner from the tip of the needle of the syringe of the viscous fluid supply device of the present invention.

FIG. 6 is a diagram showing another embodiment in which a high-viscosity adhesive is dropped onto the smooth from the tip of the needle of the syringe of the viscous fluid supply device of the present invention.

FIG. 7 is an explanatory diagram when an adhesive is applied by a conventional adhesive applying device.

FIG. 8 is a diagram showing an example in which a work is warmed by a conventional adhesive applying device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Syringe 5 Support 6 Fixture 7 Dispenser 9 Needle 11 Pusher 12 Continuity checker 13, 14 Lead line 15 Light source (light emitting element) 16 Light receiving element 17 Holding tool 18 Optical sensor 20 Tube 21 Pressure regulator 22 Nidle valve 23 Electromagnetic valve 24 Hot hose 30 Heat wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Takano 2 Higashimachi, Kichijoin Miya, Minami-ku, Kyoto-shi, Kyoto

Claims (4)

[Claims] 1. A viscous fluid in which a viscous fluid such as an adhesive is placed and a needle of a syringe attached to a shaft that moves in a vertical direction relative to a work and a work surface are brought close to and away from each other by a driving means. In the fluid supply device, means for sensing the contact between the tip of the needle of the syringe and the work surface, drive means for moving the needle or work up and down relatively, and means for controlling the drive means. And a viscous fluid supply device. 2. A means for sensing the contact between the tip of the needle of the syringe and the surface of the work is such that when the work is a conductor, one lead wire is connected to the needle of the syringe and the other lead wire is connected. 2. The viscous fluid supply device according to claim 1, wherein the lead wire is a conductive checker having two lead wires connected to the work. 3. The viscous fluid supply device according to claim 1, wherein the means for sensing the contact between the tip of the needle of the syringe and the work surface is an optical sensor. 4. A viscous fluid in which a viscous fluid such as an adhesive is placed and a needle of a syringe attached to a shaft which moves in a vertical direction relative to a work and a work surface are brought close to and separated from each other by a driving means. The fluid supply device, wherein the viscous fluid supply device comprises means for heating the needle of the syringe.