JPH0615210A - Coating device - Google Patents

Abstract

PURPOSE:To ensure that a coating material is applied uniformly and with high accuracy by providing a discharging member with a nozzle for applying the coating material to a material to be coated in such a manner that the discharging member is freely separated from the material to be coated using a drive member, and controlling the drive member by detection of a distance between the nozzle and the material to be coated. CONSTITUTION:A dispenser 3 as a discharging means for discharging an adhesive has the adhesive charged in the main dispenser system, and discharges the adhesive from a nozzle 6 by air pressure of a compressed air supplied from a compressor 2 to coat a work 4. In this case, the dispenser 3 is so designed as to move freely in a separation direction from the work 4 using a drive means including a motor M. The nozzle 6 is equipped with a microswitch 7 as a detection means. The dispenser 3 moves in a direction where the work 4 is approached and the motor M is stopped through a controller 5, if the fact that the nozzle 6 has come in contact with the work 4 is detected by the microswitch 7. At the same time, the adhesive is applied to the work 4 from the nozzle 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a coating material such as an adhesive, and more particularly to a coating apparatus capable of uniformly coating a small amount of coating material.

[0002]

2. Description of the Related Art In a conventional coating apparatus, for example, a coating material held in a flexible tube is sent out by a roller that presses the outside of the tube and discharged from a nozzle. In the case of a coating device that discharges a relatively small amount, a timer or the like is used, and a predetermined amount is discharged according to the operating time of this timer.

[0003]

However, in such a conventional coating apparatus, it is difficult to set the distance between the nozzle and the member to be coated to a predetermined value. When the interval changes, the amount of the coating material supplied from the nozzle also changes, and the coating material cannot be coated as desired on the member to be coated.

The present invention has been made in view of the above facts, and its object is to provide a coating apparatus that can perform accurate coating and can perform uniform coating with a relatively simple structure. To provide.

[0005]

In order to achieve the above object, the first coating apparatus of the present invention has a discharge member having a nozzle for applying a coating material to a member to be coated, and the discharge member to be coated. It is provided with a driving means for moving in a direction of approaching and separating from the member, a control means for controlling the operation of the driving means, and a detecting means for detecting when the distance between the nozzle and the member to be coated reaches a predetermined amount. .

Further, the coating apparatus of the present invention comprises a discharge member having a nozzle for coating the coating material on the coating target member,
Driving means for moving the discharge member in a direction of moving toward and away from the member to be coated, control means for controlling the operation of the driving unit, and detection when the nozzle comes into contact with the member to be coated to generate a detection signal And means.

[0007]

In the first coating apparatus, the control means deactivates the drive means by the detection signal from the detection means. Therefore, the nozzle and the member to be coated are set at a predetermined distance, whereby the coating material is accurately and uniformly coated on the member to be coated.
Further, in the second coating apparatus, the control means switches the driving direction of the driving means based on the detection signal of the detection means, and deactivates the driving means when the nozzle is separated from the coated member by a predetermined amount. Therefore, also in this apparatus, the nozzle and the member to be coated are set at a predetermined interval, whereby the coating material is accurately and uniformly coated on the member to be coated.

[0008]

Embodiments Next, embodiments of the coating apparatus according to the present invention will be described in detail with reference to FIGS. First, the outline of the coating apparatus of the present invention will be described with reference to FIG. 1A and 1B show a conceptual diagram of the structure of a coating apparatus. FIG. 1A is a coating apparatus showing a first embodiment, and FIG. 1B is a coating apparatus showing a second embodiment. The same members in FIGS. 1A and 1B are denoted by the same reference numerals. In FIG. 1A, 2 is a compressor as a delivery means for delivering an adhesive, 3 is a dispenser as a discharge member for discharging the adhesive, and 4 is a part as a material to be coated to which the adhesive is applied. (Hereinafter, referred to as a work) 5 is a controller as a control means. The body of the dispenser 3 is filled with an adhesive, and a nozzle 6 is provided at the tip of the body. The adhesive in the dispenser 3 is applied to the work from the nozzle 6.

The nozzle 6 of the dispenser 3 is provided with a micro switch 7 as a detection means integrally attached to the nozzle 6. For example, a pressure-sensitive type is used for the micro switch 7, and its detection site is set at a height (length) position that is substantially the same as the height (length) of the tip portion of the nozzle 6. When the dispenser 3 approaches and contacts the work 4, the micro switch 7 also contacts the work 4, and the micro switch 7 is turned on to generate a detection signal. This detection signal is sent to the controller 5. The signal from the controller 5 is sent to the motor M (acting as a driving means) for moving the dispenser 3 and the compressor 2. The output side of the motor M is drivingly connected to the dispenser 3. When the motor M rotates forward, for example, the dispenser 3 moves in a direction approaching the work 4 (left in FIG. 1), and when the motor M rotates backward, for example. The direction in which the dispenser 3 separates from the work 4 (right in FIG. 1)
Be moved to.

In this coating apparatus, when a coating start switch (not shown) is pressed or a coating start signal is externally supplied to the controller 5, the controller 5 causes the motor M to rotate normally, and the dispenser 3 causes the work 4 to move. Is moved in the direction close to. Then, when the nozzle 6 of the dispenser 3 comes into contact with the work 4, the micro switch 7 detects this and generates a detection signal, and this detection signal is sent to the controller 5. Thus, the controller 5 generates a stop signal and a supply signal based on the detection signal, the stop signal is sent to the motor M, and the motor M is deenergized. Further, the supply signal is sent to the compressor 2, the pump 2 is energized based on the supply signal, and the adhesive in the dispenser 3 is applied to the work 4 through the nozzle 6. In this embodiment, when the nozzle 6 comes into contact with the work 4, the micro switch 7 detects this and de-energizes the motor M, so that the nozzle 6 and the work 4 can be set at a predetermined distance (contact state in this case). it can. Although the micro switch 7 is turned on when the nozzle 6 comes into contact with the work 4 in the embodiment, the mounting position of the micro switch 7 is adjustable and the distance between the nozzle 6 and the work 4 is adjusted. It may be turned on when a predetermined set value (for example, about 0.2 mm) is reached.

The second embodiment shown in FIG. 1 (b) does not have the microswitch 7 as the detecting means, unlike the first embodiment. Further, the controller 5 has a retreat time setting means 10 so that after the nozzle 6 contacts the work 4, the nozzle 6 is moved in a direction away from the set time. In the second embodiment, a part of the dispenser 3, that is, the nozzle 6 and the work 4 are made of a conductive material such as a steel material. Therefore, when the nozzle 6 of the dispenser 3 contacts the work 4, the nozzle 6
The electric circuit 8 including the work 4 and the work 4 is brought into conduction, and the detection unit including the electric circuit 8 generates a detection signal.
When this detection signal is supplied to the controller 5, the controller 5 generates an inversion signal and at the same time, the retreat time setting means 10 operates. The reverse signal is sent to the motor M, the motor M is switched from normal rotation to reverse rotation based on the reverse signal, and the dispenser 3 is moved in a direction away from the work 4 after coming into contact with the work 4. Then, when the backward time setting means 10 measures the set time, the controller 5 generates a stop signal, and the motor M is deenergized based on this stop signal. Further, at this time, the controller 5 generates a supply signal, and the compressor 2 is energized by this supply signal. Thus, the compressed air is supplied from the compressor 2 to the dispenser 3, and the adhesive is discharged from the nozzle 6 by the action of the compressed air. Also in the second embodiment, since the motor M is deenergized after the set time has elapsed after the nozzle 6 contacts the work 4, the distance between the nozzle 6 and the work 4 can be set to a predetermined value, and the adhesive agent Can be accurately applied to the work 4. As can be easily understood, the interval between the nozzle 6 and the work 4 can be adjusted by changing the time set by the retreat time setting means 10, whereby the application amount of the adhesive (the thickness of the adhesive layer) can be adjusted. ) Can be changed.

Instead of the retreat time setting means 10, pulse setting means may be used. This pulse setting means
When the electric circuit 8 becomes conductive, it operates based on the detection signal, and when the set pulse number after operation is generated, the controller 5 can generate the stop signal. When the stop signal is generated, the motor M is stopped, the compressor 2 is energized, and the supply of the adhesive is started. When the pulse setting means is used, the interval between the nozzle 6 and the work 4 can be adjusted by changing the number of pulses set by this. The control by the controller 5 in the first embodiment can be applied to the second embodiment, and conversely, the control by the controller 5 in the second embodiment can also be applied to the first embodiment. it can.

Next, the above embodiment will be described in more detail with reference to FIGS. FIG. 2 is a diagram showing a side surface of the coating apparatus according to the first embodiment. In FIG. 2, the work 14 to be applied is, for example, one component for assembling a spindle motor, and includes a shallow plate-shaped bracket 45, a cylindrical shaft 44 that is erected coaxially with the bracket 45, Are fixed together.
The present coating device coats the outer peripheral surface of the shaft 44 of the work 14 with a necessary adhesive for bonding a bearing (not shown).

A motor 36 for moving the dispenser 13 and a compressor 12 are attached to the column 20. The compressor 12 is fixed via an auxiliary plate 21, and the compressor 12 includes a motor unit. When the motor section rotates, compressed air from the compressor 12 is sent to the main body section of the dispenser 13 through the outlet path 19. The controller 1 is on the left side of the figure.
5 is attached.

A nozzle 16 and a micro switch 17 are integrally provided at the tip of the dispenser 13. Further, the dispenser 13 is rotatably supported with respect to the carrier 38 at an instruction portion 39 located at the substantially central portion thereof. Therefore, the nozzle 16 and the micro switch 17, which form the tip of the dispenser 13, can be moved in the vertical direction of the drawing by shaking the head. Therefore, it is possible to freely set the coating position and angle with respect to the work 14, or the coating area. The carrier 38 is mounted on the ball screw 37 and can be moved in the left-right direction in the drawing in accordance with the rotation of the motor 36.

A wiring cord 40 is connected to the controller 15 from the micro switch 17. On the other hand, work 1
4 is attached to the holding member 34 in the direction of the arrow in the figure. The holding member 34 has a projecting portion 35 formed in an annular shape at the upper end thereof and also has a through hole 49 provided coaxially with the rotation axis 30. Protrusion 35
Are formed to correspond to the bottom shape of the bracket 45 of the work 14, and the work 14 is positioned and placed on the holding member 34. The centering shaft 33 is inserted into the through hole 49. By the centering shaft 33, the work 14 is held by the holding member 34, which will be described later.
Is held coaxially to.

The lower portion of the holding member 34 is fixed to an L-shaped mounting plate 26, which is further fixed to the air cylinder body 24. The air cylinder rod ends 25 and 29 are fixed to the column 23. Further, below the mounting plate 26, an air cylinder body 28 is fixed via an auxiliary plate 27. The motor 31 is fixed to the upper side of the air cylinder rod portion 48. The above-mentioned centering shaft 33 is connected to the motor 31 via a connecting (coupling) member 32. Therefore, the work 14 mounted on the holding member 34 is moved by the relative movement between the air cylinder body 24 and the rod 47.
It is held movably in the vertical direction in the figure and set at the optimum coating position. Then, the centering shaft 33 rises due to the relative movement of the air cylinder body 28 and the rod 48, and the work 14 is reliably mounted on the holding member 34 on the rotation axis 30 (that is, coaxially). Further, the work 14
In order to prevent shaft runout during coating, the chuck member 88 presses the tip (upper end in the figure) of the shaft 44 downward in the rotation axis 30.

In this way, when the work 14 is set on the holding member 34, the motor 36 rotates to move the carrier 38 to the left in the drawing. Nozzle 1 of dispenser 13
6 and the microswitch 17 are the shaft 4 of the work 14.
When touching 4, the micro switch 17 is turned on and input to the controller 15 via the wiring cord 40. The micro switch 17 forms a closed loop for the controller 15. As a result, the motor 36 is deenergized and the movement of the dispenser 13 is stopped. Further, the compressor 12 operates to discharge the adhesive from the nozzle 16, and the motor 31 operates via the wiring cord 43 to rotate the work 14 (on the rotation axis 30). That is, the work 14 is uniformly coated with the adhesive discharged from the nozzle 16, and after a predetermined time, these are stopped and finished. The discharge timing from the nozzle 16 is determined by the micro switch 17
Since the discharge is carried out after the contact of., The application to the work 14 is not excessive or insufficient. In addition, the nozzle 16
Since the gap between the workpiece 14 and the work 14 can be accurately set to a predetermined value, the adhesive layer can be substantially uniform and the supply amount can be kept constant. In addition, it is desirable that the liquid contact portion of the container 11, the dispenser 13, the nozzle 16 and the like be made of stainless steel, titanium, ceramic or the like depending on the adhesive used. Also, the adhesive supply path 1
A fluorine resin material or the like is used for 8 and the lead-out path 19.
As the coating machine including the compressor 12, for example, a commercially available precision coating machine model 7000 from Nippon Loctite Co., Ltd. can be used.

FIG. 3 is a side view of the coating apparatus according to the second embodiment described above. The same parts as those of the first embodiment shown in FIG. 2 are designated by the same reference numerals.
In FIG. 3, when describing the second embodiment, only parts and configurations different from those of the first embodiment shown in FIG. 2 will be described. In FIG. 3, a wiring cord 40 extending from the controller 15 is connected to the conductive terminal 61 of the dispenser 13. The conductive terminal 61 is electrically connected to the nozzle 16. On the other hand, the holding member 34 includes the upper holding portion 50.
And the lower holding portion 51 are formed separately, and the centering shaft 33 is inserted coaxially with each rotation axis 30. An insulating sheet 52 is provided between the upper holding member 50 and the lower holding member 51. The upper holding member 50 is made of a conductive steel material, and the wiring cord 60 is connected to the conductive terminal 53. The wiring cord 60 is connected to the controller 15.

In the second embodiment, the work 14 is made of a conductive material such as steel or aluminum. Therefore,
After the work 14 is set on the holding member 34, when the dispenser 13 moves and the nozzle 16 contacts the work 14, the electric circuit including the dispenser 13 and the work 14 becomes conductive, and the detection means including this electric circuit. Generate a detection signal. As a result, the controller 15 generates an inversion signal and the reverse time setting means operates, and the motor 36 is switched from normal rotation to reverse rotation based on this inversion signal. Then, when the retreat time setting means measures the set time, the motor 36 is deenergized, and the nozzle 16 and the work 14 become a predetermined interval. When the motor 16 is deenergized, the compressor 12 is activated and the supply of adhesive is started. Also in this second embodiment, since the motor 16 is deenergized after a predetermined set time has elapsed after the dispenser 13 (nozzle 16) has contacted the work 14, the nozzle 1
The distance between 6 and the work 14 can be accurately set to a predetermined value, and accurate and uniform coating without unevenness can be achieved. Also,
Since the electric circuit including the nozzle 16 and the work 14 is used, the micro switch in the first embodiment is not necessary. As the coating machine including the compressor 12, a device known per se using rollers, for example, a commercially available coating machine model 8000 from Nippon Loctite Co., Ltd. can be used instead of the above-mentioned coating machine.

Next, FIG. 4 is an enlarged view of an essential part showing the shape of the nozzle 16 in the second embodiment. Figure 4
As shown in (a), the lower left direction toward the drawing is the ejection side. In the second embodiment, the nozzle 16 serves not only to eject the adhesive but also to serve as an electrical contact. Therefore, a tongue-shaped portion 72 is integrally formed at the tip end portion of the nozzle 16, and the tip end portion of the tongue-shaped portion 72 contacts the work 14 (specifically, the outer peripheral surface of the shaft 44). Then, the adhesive is discharged from the discharge hole 70. Figure 4
(B), (c) is a side view showing a contact state between the nozzle 16 and the shaft 44. The distance between the opening 79 of the nozzle 16 and the tip of the tongue-shaped portion 72 is x, and the angle y between the opening plane of the opening 79 and the rotation axis 30 is set. Can be discharged.

With respect to the above, according to the present embodiment, it is possible to change the drive rotation speed of the motor portion of the compressor 12 to change the discharge amount, but in the motor in which the rotation speed cannot be changed, The following configurations are useful. That is, in FIG. 4, by increasing the dimension of x,
When the discharge pressure of the adhesive is constant, the discharge amount, specifically, the layer thickness of the adhesive applied to the work 14 can be increased. Even under the condition of constant discharge pressure, the discharge amount may decrease as the viscosity increases. However, by increasing the degree of the angle y, for example, a predetermined discharge amount can be secured.

5A and 5B are enlarged views showing another shape of the nozzle 16. 5A is a side view seen from the side, and FIG. 5B is a plan view seen from the upper side. In this embodiment, the difference from the nozzle 16 of FIG. 4 is that the projections 73, 74 are formed at the tip. Figure 5
The outer diameter of the shaft 44, which is the member to be coated, is set to be smaller than the radial dimension of the discharge hole 70 in (b). When the nozzle 16 comes into contact with the outer peripheral surface of the shaft 44, the shafts 44 are coaxially supported by the projecting end portions 73 and 74, and there is no blur accompanying the rotation of the shaft 44.
Stable coating can be performed. Further, the protrusions 73 and 74 can prevent the adhesive from bleeding or squeezing out from the discharge hole 70.

FIG. 6 shows the tongue portion 72 and the tip end portion 7 described above.
Unlike the integral shape of 3, 74, the nozzle 16 is provided with the contactor 80 as a separate body. The tip 81 is formed in a ball shape. Since the contactor has the elasticity of a phosphor bronze material, it is difficult to scratch the shaft.

Although the embodiment of the coating apparatus according to the present invention has been described above, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention. . For example, although the compressor 12 is used as the delivery means in the present embodiment, the delivery of the adhesive by the rotary pump and the drive shaft having the partition wall spirally provided in the rotation axis direction are also provided. It can be freely selected, for example, by rotating and feeding the adhesive. Moreover, the shape and type of the controller 15 for turning on the controller 15, such as the method of the micro switch 17 and the shape of the nozzle 16 of the dispenser 13, are not limited. A timer means may be used to set the adhesive discharge time,
However, the present invention is not limited to this. For example, when the rotation of the work 14 is detected by an encoder or the like and a predetermined rotation speed is reached,
The discharge may be stopped. In addition, a container for accommodating the adhesive may be provided separately from the dispenser 13, and the adhesive in the container may be supplied through the dispenser.

[0026]

According to the coating apparatus of the present invention, when the distance between the member to be coated and the nozzle reaches a predetermined amount, the control means deactivates the driving means based on the signal from the detection means. The distance between the nozzle and the member to be coated can be set to a predetermined amount. Further, the control means switches the driving direction of the drive means based on the detection signal of the detection means, and deactivates the drive means when the nozzle is separated from the member to be coated by a predetermined amount. The interval can be set to a predetermined amount. Therefore, in the above-described coating apparatus, the distance between the nozzle and the nozzle can be set to a predetermined value with reference to the member to be coated, so that accurate coating can be performed and uniform coating without unevenness can be performed. In particular, when the application amount is small and accurate application is required, the effect is enhanced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the configuration of a coating apparatus according to the present invention, in which FIG. 1 (a) is a coating apparatus showing a first embodiment and FIG. 2 (b).
Is a coating apparatus showing a second embodiment.

FIG. 2 is a side view of the coating apparatus according to the first embodiment, showing the coating apparatus according to the present invention.

FIG. 3 is a side view of the coating apparatus according to the second embodiment, showing the coating apparatus according to the present invention.

FIG. 4 is an enlarged view of an essential part showing a part of the coating device shown in FIG. 3, FIG. 4 (a) is a perspective view thereof, and FIGS. 4 (b) and 4 (c) are side views thereof. It is a figure.

5 shows another embodiment of the main part enlarged view shown in FIG. 4,
5A is a side view thereof, and FIG. 5B is a plan view thereof.

FIG. 6 is a side view showing still another embodiment of the enlarged view of the main parts shown in FIG.

[Explanation of symbols]

 2,12 Compressor (delivery means) 3,13 Dispenser (discharging member) 4,14 Work (material to be coated) 5,15 Controller (control means) 6,16 Nozzle 7,17 Micro switch (detection means) 8 Circuit 70 Discharge Hole 71 Outlet hole 72 Tongue

Claims (7)

[Claims] 1. A discharge member having a nozzle for applying a coating material to a member to be coated, a driving unit for moving the discharge member in a direction of approaching and separating from the member to be coated, and the driving unit. And a detection means for detecting when the distance between the nozzle and the member to be coated reaches a predetermined amount, the control means driving the driving means by a detection signal from the detection means. A coating device which deenergizes and thus sets the nozzle and the member to be coated at a predetermined interval. 2. The coating apparatus according to claim 1, wherein the detecting means detects when the nozzle comes into contact with the member to be coated, and thus the nozzle and the member to be coated are set at a predetermined interval. 3. The nozzle and the member to be detected are made of a conductive material, and when the nozzle comes into contact with the member to be detected, an electric circuit including the nozzle and the member to be detected becomes conductive. The coating device described. 4. A discharge member having a nozzle for applying the coating material to a member to be coated, a driving unit for moving the discharge member in a direction of approaching and separating from the member to be coated, and a driving unit. And a detection means for detecting the contact of the nozzle with the member to be coated and generating a detection signal when the nozzle comes into contact with the coating target member, the control means based on the detection signal of the detection means. The driving direction of the driving means is switched, and when the nozzle is separated from the coated member by a predetermined amount, the driving means is deenergized, and thus the nozzle and the coated member are set to a predetermined distance. And coating equipment. 5. The control means has a retreat time setting means,
The coating apparatus according to claim 4, wherein the retreat time setting means operates based on the detection signal of the detection means, and deactivates the drive means after the set time has elapsed. 6. The control means includes pulse setting means, which operates based on the detection signal of the detection means to deactivate the driving means after generating a set number of pulses. The coating device according to claim 4. 7. The nozzle and the member to be detected are made of a conductive material, and when the nozzle comes into contact with the member to be detected, an electrical circuit including the nozzle and the member to be detected becomes conductive. The coating device described.