JPH043272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealant coating device used in the manufacturing process of parts used in electronic devices, control devices, and the like.

(Prior art) In recent years, parts such as relays used in electronic equipment or control devices have become smaller, so the
As shown in FIG. 3, a predetermined part 30c is attached to one side of a substrate 30b made of synthetic resin, and a terminal 30d is made to protrude from the other side to form a single unit, and the unit is assembled into a frame made of synthetic resin. 30
A, a sealing material 31 is applied to the joint between the frame 30a and the substrate 30b and the base of the terminal, and is solidified to be assembled into an integral body.

As an apparatus for applying a sealant in the above-mentioned parts manufacturing, for example, there is a machine having a nozzle for discharging the sealant on a machine base that moves in the left and right direction, as described in Japanese Patent Application Laid-Open No. 54-38337. On the tool mounting surface of the distal end of a coating device having an arm that can be freely moved back and forth, or a robot that has a rotatable arm as described in Japanese Patent Laid-Open No. 55-81759, A coating device has been proposed that is equipped with a gun having a nozzle for discharging a sealant.

(Problems to be Solved by the Invention) In the former case, in the coating device as described above, the nozzle 20 is placed in a vertical position as shown in FIGS. 8 and 9, and the frame 30a, Also, since the sealant is applied by moving it in a zigzag pattern along the terminal 30d, the application time becomes longer, and since the nozzle is moved vertically, when applying the sealant near the terminal, the nozzle is applied to the terminal. There was a problem that the nozzle or terminal could be damaged.

In the latter case, since the tip position of the sealant discharging nozzle and the rotation center of the robot to which the gun is attached are not aligned, changing the nozzle angle as shown in Figure 10 will cause the nozzle tip position to change. change. Therefore, it is necessary to use a robot with multiple rotating arms or to correct the position of the nozzle tip by moving the nozzle horizontally, which complicates the configuration of the robot body and control device. At the same time, there was a problem that the time required to apply the sealing material was increased.

(Objective) An object of the present invention is to enable quick and accurate application of a sealant to a predetermined position using a device with a simple configuration.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the sealant applicator of the present invention has an arm rotatably attached to a holder that moves in three axes of X, Y, and Z, and A supply device having a nozzle for discharging sealant at the lower end is attached vertically to the arm, and the sealant is applied by moving the nozzle for discharging sealant vertically or in an inclined state back and forth and left and right. In the apparatus, the tip position of the sealing material discharging nozzle is maintained at all times regardless of whether the arm and the container attached to the arm have the sealing material discharging nozzle vertically or tilted horizontally. is located on the rotation center axis of the arm.

(Embodiment) The structure of one embodiment of the sealant coating device of the present invention will be described based on FIG. 4.

1 is a machine base, and 2 is a fixed base attached to the machine base 1. A movable table 4 is provided on the fixed table 2 and moves along the guide rod 3, and a screw shaft 6 is screwed thereto. Reference numeral 5 denotes an electric motor connected to the screw shaft 6, which rotates the screw shaft 6 in forward and reverse directions to cause the movable table 4 to reciprocate. 7 is a fixed base attached to the movable base 4; 9 is a movable base that moves along a guide rod 8 provided on the fixed base 7;
1 is screwed on. Reference numeral 10 denotes an electric motor connected to a screw shaft 11, which rotates the screw shaft 11 in forward and reverse directions to move the movable base 9 in a direction perpendicular to the moving direction of the movable base 4 described above. Movable stand 4,
The amount of movement of the screw shaft 9 is counted by detecting the number of revolutions of the screw shafts 6 and 11 using encoders 27 and 28. 12 is a bracket attached to the movable base 9, and 14 is a holder that moves along a guide rod 13 provided on the bracket 12. 15 is a fluid cylinder, a piston rod is connected to the holder 14, and the holder 14
It is designed to raise and lower. Reference numeral 16 denotes an L-shaped arm rotatably mounted on the holder 14, and a piston rod of a fluid cylinder 18 is connected to one end of the arm via a connector 17. 1
9 is a sealant supply device attached to the end of the arm 16, and a discharge nozzle 20 is provided at the bottom of the sealant supply device.
is attached so that its tip position is the center of rotation of the arm 16. Therefore, even if the arm 16 is rotated to tilt the nozzle 20 as shown in FIG. 5, the position of the tip does not change. 21 is a sealing material supply pipe connected to the sealing material supplying device 19. Reference numeral 22 denotes a compressed air supply pipe connected to the sealant supply device 19, and is adapted to instantaneously discharge and stop the sealant from the supply pipe 19. 23
A movable table is movably attached to a fixed table 2 attached to the machine table 1 at a predetermined interval, and is provided with a positioning protrusion 24. Reference numeral 25 denotes a pressing tool installed at a position facing the positioning protrusion 24, which is reciprocated by a fluid cylinder (not shown) and presses the workpiece 30 against the positioning protrusion 24 to position it. It's like being held in place. 26 is a shooter, and the workpiece part 3
0 is supplied to the movable table 23 one by one.

The above-mentioned electric motors, fluid cylinders, etc. are operated by a control device (not shown) comprising an operation setting circuit, a memory circuit, a comparison calculation circuit, an operation command circuit, etc.

Further, the nozzle 20 used has an inner diameter of 0.3 mm to 2 mm, the height from the tip of the nozzle 20 to the coating surface of the workpiece is 0.5 mm to 2 mm, and the discharge nozzle 20, the frame 30a, and When the horizontal distance of the terminal 30d is set to 0.1 mm to 1 mm and the nozzle moving speed is set in the range of 5 mm/sec to 20 mm/sec, the nozzle is moved approximately linearly along the frame and the terminal etc. The sealant can be reliably applied to the joint between the frame and the board and around the terminals by simply applying the sealant to the joint between the frame and the board.

Good results can be obtained when the sealant used in the above-mentioned sealant coating device has a viscosity in the range of 10,000 cp to 100,000 cp.

A sealing material application operation using the above-mentioned sealing material application device will be described.

First, the nozzle operation order, sealing material supply operation, etc. are set and input into a control device (not shown). Further, the sealing material to be applied and the parts to be processed are prepared respectively.

When these preparations are completed, a coating operation start signal is input to a control device (not shown) to start the coating device.

By this operation, the workpiece 30 is moved to the shutter 26.
The part to be processed 30 is conveyed to the processing position on the movable base 23, and then a fluid cylinder (not shown) is activated and the pressing tool 25 is projected to press and clamp the part to be processed 30 against the positioning protrusion 24. When the workpiece 30 is fixed at the processing position, the electric motors 5 and 10 are activated to move the movable bases 4 and 9 back and forth and left and right, respectively, and the nozzle 20 is moved to the starting position for applying the sealant to the workpiece 30. and move the fluid cylinder 1 to
5 operates to lower the nozzle 20 together with the holder 14. When the nozzle 20 moves to a preset position, the fluid cylinder 18 is activated, the piston rod is retracted, and the arm 16 is rotated.
The nozzle 20, which was in a vertical state, is tilted at a preset angle with the tip of the nozzle 20 as the center of rotation, as shown in FIG. Then, electric motor 10
is operated, the screw shaft 11 is rotated, and the nozzle 20 together with the movable base 9 is moved along the frame 30a in the direction of A as shown in FIG. At this time, the sealing material supply path of the supply device 19 is switched and the nozzle 20
A sealing material is discharged from the frame 30a and the substrate 30.
It is applied to the joint of b. When the nozzle 20 moves to a predetermined position, the electric motor 10 stops and the nozzle 2
0 is stopped at that position. Next, the electric motor 5 is activated to rotate the screw shaft 6, and the nozzle 20 together with the movable base 4 is moved linearly in the direction of the bottom portion along the terminal 30d. When the nozzle 20 moves to a predetermined position on the bottom part, the electric motor 5 stops to stop the nozzle 20 at that position, and the electric motor 10 operates to reversely rotate the screw shaft 11 and move the nozzle 2 together with the movable base 9.
0 is moved in the direction of part C. When the nozzle 20 moves to approximately the center between the bottom and bottom sides of the frame 30a, the fluid cylinder 18 is actuated to project the piston rod, the arm 16 is rotated, and the nozzle 20 is moved from the -θ position to the vertical position. After passing through this state, the tip of the nozzle is tilted to the +θ state, which is the direction of section C. When the nozzle 20 reaches the preset angle, the motor 10 is activated again to continue moving the nozzle. When the nozzle 20 is moved to a predetermined position in the section C by this operation, the electric motor 10 is stopped, and at the same time, the electric motor 5 is activated, the screw shaft 6 is rotated in the reverse direction, and the nozzle 20 is moved together with the movable base 4 in the direction of the section D. When the nozzle 20 moves linearly along the terminal 30d to a predetermined position in the second part, the electric motor 5 stops, and at the same time, the electric motor 10 operates and the screw shaft 11
is rotated, and the nozzle 20 is moved in the direction of A. When the nozzle 20 moves to the application start position, the electric motor 10 stops and at the same time the fluid cylinder 1
8 operates and retracts the piston rod, arm 1
6 to place the nozzle 20 in a vertical position.
Next, the sealant supply path of the supply device 19 is switched by the compressed air from the compressed air supply pipe 22, and the discharge of the sealant is stopped. When the discharge of the sealing material stops, the fluid cylinder 15 operates to raise the nozzle 20 together with the holder 14. Next, the fluid cylinder (not shown) of the pressing tool 25 is activated, and the pressing tool 2
5 is moved back and away from the workpiece 30. When the clamping of the workpiece 30 is released by this operation, the movable table 23 is moved to the delivery position, delivers the processed workpiece 30, and then returns to the processing position. This operation completes the sealing material application operation.

By repeating the above-described operations, the sealing material can be applied automatically and continuously.

In addition, a nozzle 20 with an inner diameter of 0.58 mm is used, the height from the coating surface to the nozzle is set to 1 mm, the horizontal distance between the nozzle 20, the frame 30a, and the terminal 30d is set to 0.5 mm, and the height is set to 10 mm/ When the sealing material 31 having a viscosity of 50,000 cp to 60,000 cp was applied at a speed of sec, it was possible to uniformly apply the sealing material 31 to a predetermined position.

Further, in the embodiment, the nozzle was inclined outward to apply the sealant, but the direction of inclination of the nozzle is determined depending on the shape of the non-applied parts.

(Effects of the Invention) The sealant coating device of the present invention has three
An arm is rotatably attached to a holder that moves in the axial direction, and a feeder having a sealant discharge nozzle at the lower end is attached vertically to the arm, and the sealant discharge nozzle is vertically or
In the apparatus for applying a sealant by moving the sealant in the front, back, left and right directions in an inclined state, the arm is arranged in a state in which the sealant discharging nozzle is vertical together with a container attached to the arm, or in a state in which it is inclined in a horizontal direction. Since the tip of the sealing material discharging nozzle is always located on the rotation center axis of the arm, regardless of the state, the sealing material discharging nozzle can be tilted by rotating the arm. The tip position of the nozzle does not move, and the sealant can be quickly and accurately applied to the joints between the frame and the board, protruding parts such as terminals, etc., and the sealant application time is greatly reduced. can do.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing one embodiment of an electronic device component. 2 is a plan view of FIG. 1, and FIG. 3 is a schematic view taken in the direction of arrow A in FIG. FIG. 4 is a schematic perspective view showing one embodiment of the sealant coating device of the present invention. FIG. 5 is a schematic view showing the seal discharge nozzle of the present invention in an inclined state. FIG. 6 is a schematic view showing the order of movement of the nozzle with respect to the workpiece, and FIG. 7 is a schematic view taken in the direction of arrow B in FIG. FIG. 8 is a schematic plan view showing the movement of a nozzle when applying a conventional sealant. 9th
The figure is a schematic view taken in the direction of arrow C in FIG. 10th
The figure is a schematic view showing the rotating state of a nozzle of a conventional sealant coating device. 1: Machine base, 2, 7: Fixed base, 3, 8, 13: Guide rod, 4, 9, 23: Movable base, 5, 10: Electric motor, 6, 11: Screw shaft, 12: Bracket, 1
4: Holder, 15, 18: Fluid cylinder, 1
6: Arm, 19: Supply device, 20: Nozzle.

Claims (1)

[Claims] 1. An arm is rotatably attached to a holder that moves in the three axes directions of X, Y, and Z, and a feeder having a nozzle for discharging sealant at the lower end is attached vertically to the arm, and the sealant is dispensed. In a device that applies a sealant by moving the discharge nozzle vertically or in an inclined state in the front, back, left, and right directions, the arm is placed in a state where the sealant discharge nozzle is vertical together with a container attached to the arm, or , a sealing material application characterized in that the tip position of the sealing material discharge nozzle is always located on the rotation center axis of the arm, regardless of the state in which it is tilted in the horizontal direction, etc. Device.