JPH0518633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an apparatus for applying a highly viscous fluid such as an adhesive or a creamy solder to a base material such as a printed circuit board. It's about retention.

BACKGROUND ART One type of apparatus for applying high viscosity fluid is one that injects a predetermined amount of high viscosity fluid contained in a syringe. The syringe has a discharge pipe attached to its lower end and can be raised and lowered by a lifting device. During application, the syringe is lowered from the raised position, and the discharge pipe is placed in a minute position directly above the application position of the base material. be located at a distance.

The coating device described in Japanese Utility Model Application Publication No. 175270/1983 is one example, and in this device, the syringe is suspended from the lower end of a rod that is supported by a frame so that it can be raised and lowered, and the rod is moved up and down. It is designed so that it can be raised and lowered.

Problems to be Solved by the Invention However, if the syringe is suspended from the lower end of the rod in this way, the syringe swings around the part held by the rod's holding member, causing the discharge tube to shift from the application position. As a result, there was a problem that the coating accuracy deteriorated. If the operating speed is slowed down to prevent vibrations, the time required for coating will increase, resulting in a problem of reduced operating efficiency.

Means for Solving the Problems In order to solve the above problems, the high viscosity fluid applicator according to the present invention includes (a) a frame, (b) a high viscosity fluid, and stores the high viscosity fluid in a place. a syringe that injects a fixed amount at a time; (c) a cylindrical member having a discharge pipe attached to its lower end and a lower end of the syringe removably attached to its upper end; and (d) a cylindrical member attached to a frame. a holding member for holding;
One of the cylindrical member and the holding member can be raised and lowered with respect to the frame, and one of them is raised and lowered by a lifting device.

Function and Effect In the coating device configured as above,
The syringe is raised and lowered by raising and lowering the cylindrical member or the holding member. When the holding member is raised and lowered, the cylindrical member is raised and lowered together with the holding member, and when the cylindrical member is raised and lowered, the holding member is fixed to the frame and guides the raising and lowering of the cylindrical member. However, in either case, the cylindrical member directly above the discharge pipe is held and moved up and down while being prevented from moving in the radial direction, so even if vibrations etc. The position of the coating will not shift, and coating will be performed with high precision. Further, since positional deviation does not occur even when vibrations or the like are applied, the operating speed can be increased, resulting in the effect of improving operating efficiency.

Further, since the cylindrical member is held by the holding member and the syringe is detachably attached to the cylindrical member, the syringe can be replaced easily and quickly.

EMBODIMENTS Hereinafter, a case in which the present invention is applied to an apparatus for applying adhesive to a location where electronic components are fixed on a printed circuit board will be described in detail based on the drawings.

FIG. 3 is a diagram showing the entire adhesive application device, and in the figure, reference numeral 10 denotes an X-axis table that moves in the X-axis direction within a horizontal plane. X-axis table 1
0 is moved by a ball screw screwed into a nut (not shown) being rotated by a servo motor. Further, on the X-axis table 10, a Y-axis table 12 is provided which moves in a Y-axis direction perpendicular to the X-axis direction in a horizontal plane. The Y-axis table 12 has a nut 1 fixed thereto.
4 is screwed onto the ball screw 16, and the ball screw 16
is moved by being rotated by the servo motor 18.

A pair of coating units 24 are attached to the side surfaces of the Y-axis table 12 parallel to the X-axis direction by brackets 26, each of which is a holding member.
The Y-axis table 12 constitutes a frame that supports the coating unit 24, and the bracket 2
6 is attached to the Y-axis table 12 so as to be movable up and down, and is raised and lowered by a lifting device 28 while holding the coating unit 24.

The bracket 26 is L-shaped as shown in FIG. 2, and a guide block 32 provided on one arm portion 30 is slidably fitted into a guide rail 34 provided on the Y-axis frame 12. ing. A block 36 is attached to the side surface of the Y-axis table 12 so as to extend downward, and a guide rail 34 is attached to the front surface of the block 36 so as to extend vertically.
is raised and lowered vertically at a position below the Y-axis table 12.

A gear housing 4 is mounted on the Y-axis table 12.
0 is fixed so that a part of it protrudes from the side surface, and a rack 42 is attached to the protrusion in the vertical direction via a pair of slide bearings 44, as shown in FIGS. 4 and 5. movably mounted. The gear housing 4 is mounted on the rack 42.
A gear 46 rotatably supported by the gear 46 is meshed with the gear 46. A sector gear 48 is integrally provided on the gear 46 and is meshed with another gear 50, which is rotated by a servo motor 52 to move the rack 42.

The lower end of the rack 42 has a yoke shape and is connected to a rod 54, as shown in FIG. 2, to which the bracket 26 is connected by a plate 56. One end of the plate 56 is fixed to the lower surface of the arm 30 of the bracket 26, and the other end is slidably fitted to the rod 54 and disposed between it and a spring receiver 58 provided on the rod 54. It is urged downward by a spring 60. The plate 56 is prevented from coming off the rod 54 by a nut 62 screwed into the lower end of the rod 54. The bracket 26 is raised and lowered when the plate 56 is raised and lowered integrally with the rod 54 while in contact with the nut 62. The rack 42, gear 46, sector gear 48, gear 50, servo motor 52, rod 54, plate 56, etc. constitute the lifting device 28. The rack 42 is designed to be lowered a short distance even after the bracket 26 reaches a predetermined lowering end position, but the extra lowering distance is absorbed by the compression of the spring 60. Further, the rising end of the rack 42 is detected by a photoelectric switch 66 provided on the gear housing 40, and the descending end of the rack 42 is detected by a photoelectric switch 68 provided on the plate 56.
(see FIG. 3), and switching of the servo motor 52 is performed based on the detection signal.

The other arm 70 of the bracket 26 extends horizontally from the lower end of the arm 30, and the application unit 24 is attached to this arm 70. As shown in FIG. 1, a cylindrical member 72 is fitted into the arm portion 70 via a sleeve 74 so as to be rotatable and immovable in the axial direction.

The cylindrical member 72 has a cut-off shape, is fitted into the sleeve 74 at a small diameter portion 76, is seated on the sleeve 74 at a large diameter portion 77, and is fitted with a pin 78.
Rotation relative to the sleeve 74 is prevented by. Further, a discharge head 82 having one discharge pipe 80 is fitted into the lower end portion of the cylindrical member 72 protruding from the arm portion 70, and is engaged with a pin 84 to prevent rotation. It is fixed with a cap nut 86. A stopper 88 extending downward from the distal end of the discharge pipe 80 is fixed to the discharge pipe 80, and when the adhesive is applied, the stopper 88 comes into contact with the printed circuit board to create a certain gap between the stopper 88 and the discharge pipe 80. There is.

On the other hand, the sleeve 74 is rotatably supported by the arm portion 70, and a nut 90 is screwed onto the lower end portion protruding from the arm portion 70 to prevent movement in the axial direction. Further, a large diameter gear 92 is provided at the upper end of the sleeve 74. This large-diameter gear 92 is meshed with a small-diameter gear 94 (see FIG. 3) that is arranged rotatably around an axis extending vertically between the pair of units 24, and the small-diameter gear 94 is connected to a servo motor 96. By being rotated by , the sleeve 74 is rotated and the cylindrical member 72 is also rotated. The large diameter gear 92, the small diameter gear 94, the servo motor 96, etc. constitute a rotational drive device.

Furthermore, a syringe 9 is attached to the upper end of the cylindrical member 72.
8 is attached. The syringe 98 is made up of a bottomed cylindrical member 100 whose opening is closed by a cap 102, and a piston 104 fitted therein in an airtight and slidable manner. Syringe 9
8 is a holding member fixed on the sleeve 74 and is airtightly fitted into a fitting hole 110 formed in the large diameter portion 77 of the cylindrical member 72 at a small diameter fitting protrusion 108 formed at the lower end. 112, it is held immovable in the axial direction and immovable relative to each other.

The holding member 112 has a cylindrical shape with a bottom, and its bottom wall is fitted into the cylindrical member 72 and the sleeve 74, and is fixed to the sleeve 74 with bolts 114. A pair of inward flange portions 116 are formed in the opening of the holding member 112, and have an inner diameter into which the cylinder 98 can be fitted, and the peripheral wall of the holding member 112 is formed at two diametrically separated locations. Notched opening 118 reaching
is formed. Engagement protrusions 120 that extend outward are formed at two diametrically apart locations on the lower part of the syringe 98, and when the engagement protrusions 120 and the notches of the opening 118 are in phase with each other, the syringe 98 is held in the holding member. 112, and the fitting protrusion 1
08 into the fitting hole 110, and then insert the syringe 9 into the fitting hole 110.
8, the engagement protrusion 120 engages with the flange portion 116 and is prevented from moving in the axial direction, and is held in a state where relative rotation is prevented due to friction generated on the contact surface with the flange portion 116. It will be done. The inner surface (lower surface) of the flange portion 116 is an inclined surface that approaches the bottom wall of the holding member 112 as it goes from one side in the circumferential direction to the other side, and the syringe 9
8 is pressed against the cylindrical member 72 as it rotates.

Furthermore, in the cap 102 of the syringe 98,
A hose 122 (second
(see figure) are connected by a connecting fitting 124. An electromagnetic directional switching valve is provided in the middle of the hose 122, and by switching the switching valve, the syringe 98 is selectively communicated with the compressed air supply source and the atmosphere. By supplying compressed air to the syringe 98, the piston 104 is lowered, and a predetermined amount of adhesive is injected through the cylindrical member 72, the passage formed in the discharge head 90, and the discharge pipe 88.

As shown in FIG. 3, this adhesive applicator is equipped with a camera 126 that reads reference marks provided on the printed circuit board. This camera 126 is mounted on the Y-axis table 12 at a position adjacent to the unit 24, and reads the reference mark prior to applying the adhesive. The adhesive application position is set based on the reference mark, and based on the reading result, tables 10 and 1 are set.
2 is corrected, so that the application unit 24 can be moved with high precision to the adhesive application position on the printed circuit board.

The operation will be explained below. When the printed circuit board is transported by the transport device, supported by the printed circuit board support device, and positioned at a predetermined adhesive application position by the stopper, the camera 126
The fiducial mark is read by
After the movement amounts of 0 and 12 are corrected, the tables 10 and 12 are moved, and the one of the pair of coating units 24 that is used for coating is moved.
The center of the discharge pipe 80 attached to is located directly above the adhesive application position. table 10,1
2 is stopped, the servo motor 52 is activated and the rack 42 is lowered, thereby lowering the coating unit 24 together with the bracket 26. As the unit 24 descends, a stopper 88 fixed to the discharge pipe 80 comes into contact with the printed circuit board, and after this contact, the rod 54 moves a short distance relative to the unit 24 while compressing the spring 60. The stopper 88 ensures contact between the two while preventing damage to the printed circuit board, and the discharge pipe 80 is positioned at a certain minute distance from the printed circuit board.

When the rod 54 has been lowered a predetermined distance, the servo motor 52 is stopped, compressed air is supplied to the syringe 98, the piston 104 is lowered, and the adhesive is injected and applied to the printed circuit board. Once compressed air has been supplied for a preset period of time and a predetermined amount of adhesive has been applied, the syringe 98 is communicated with the atmosphere and the piston 104
The lowering of the unit 24 is stopped and the injection of adhesive is stopped, and the servo motor 52 is activated to raise the unit 24 together with the bracket 26.
It is then moved to the position where adhesive is to be applied.

In this way, in the coating device of this embodiment, the cylindrical member 72 is held by the bracket 26, and the discharge pipe 80 is raised and lowered with the portion immediately above it being held, so that vibrations etc. are applied when descending. The adhesive will not shift even when the adhesive is applied, and the adhesive will be accurately positioned at the application position. Although vibrations may be applied to the discharge pipe 80 due to the start and stop of movement of the X-axis table 10 and Y-axis table 12, even in such cases, no vibration occurs and the discharge pipe 80 is accurately positioned at the application position. Ru.

Furthermore, since there is no possibility of misalignment of the discharge pipe 80, the unit 24 can be moved horizontally and raised and lowered at high speed, and the coating time can be shortened.

Furthermore, in this embodiment, the coating unit 2
4 is lifted and lowered by the lifting device 28 using the servo motor 52 as a drive source, so that the lifting position can be determined with high accuracy.

Note that adhesive may be applied to two points at a time, and in this case, the discharge head 82 is connected to the discharge pipe 80.
Coating is performed by replacing the discharge pipe with one equipped with two, but at this time it may be necessary to change the direction in which the two discharge pipes 80 are arranged. In that case, the servo motor 96 is driven to rotate the cylindrical member 72. At this time, a radially outward force acts on the cylindrical member 72, but since the discharge pipe 80 is located very close to the position where the cylindrical member 72 is held by the bracket 26, the above force is applied. As a result, the position of the discharge pipe 80 does not shift, and coating is performed with high precision.

Furthermore, when the adhesive in the syringe 98 runs out, it is only necessary to disengage it from the holding member 112, remove it from the cylindrical member 72, and mount a new cylinder 98 filled with adhesive. And it can be replaced quickly.

Furthermore, although the coating units 24 are normally used one at a time, for example, when coating with one discharge tube and coating with two discharge tubes are performed alternately, the discharge tubes 80 are connected to one unit 24. A discharge head having one discharge pipe 80 may be attached to the other unit 24, and a discharge head having two discharge pipes 80 may be attached to the other unit 24, so that both units 24 can be used alternately. Also, if the adhesive in the syringe 98 of one unit 24 runs out, the other unit 24
Continuous application is also possible by using .

Another embodiment of the invention is shown in FIG. In this embodiment, a bracket 130 serving as a holding member is fixed to the Y-axis table 12, and a cylindrical member 132 is held by the bracket 130 so as to be movable up and down. Note that the same parts as in the above embodiment are given the same reference numerals to indicate correspondence, and detailed explanation will be omitted.

A sleeve 134 is fitted into the bracket 130 so as to be rotatable and immovable in the axial direction, and the cylindrical member 132 is fitted into the sleeve 134 so as to be slidable in the axial direction, and relative rotation is prevented by a pin 136. has been done. The fitting length of the sleeve 134 into the bracket 130 is made considerably longer than the outer diameter of the cylindrical member 132 to prevent the cylindrical member 132 from tilting.

A holding member 140 is fixed to the upper portion of the cylindrical member 132 that protrudes from the sleeve 134. A long hole 142 extending in the circumferential direction and having a center angle of approximately 90 degrees is formed in the peripheral wall of the holding member 140, and a roller 146 rotatably attached to a lever 144 is installed in the center of the long hole 142. It is being inserted. The lever 144 is L-shaped as shown in FIG. 7, and is rotatably attached to the Y-axis frame 12 by a shaft 148 around one axis, and a roller 146 is rotatably attached to the tip of one arm. It is being The tip of the other arm portion of the lever 144 has a yoke shape, and a fixed screw member 154 is engaged with a piston rod 152 of an air cylinder 150. The lever 144 has a spring 156 disposed between it and the piston rod 152.
The head 158 of the screw member 15 is engaged with the head 158 of the screw member 15.

The lever 14 is moved by the expansion and contraction of the piston rod 152.
4 is rotated in a vertical plane, and the roller 14
6 presses the holding member 140 to move it up and down, and as the holding member 140 moves up and down, the cylindrical member 1
32, the syringe 98 is raised and lowered. Lever 1
44, rollers 146, air cylinder 150, etc. constitute a lifting device. The piston rod 152 is designed to be extended a short distance even after the stopper 88 contacts the printed circuit board.
That stroke is absorbed by the compression of spring 156. Further, when changing the direction of the discharge pipe 80, the roller 146 rolls within the elongated hole 142,
Rotation of the cylindrical member 132 is allowed.

Even when the cylindrical member 132 is moved up and down in this way, the cylindrical member 132 is held by the bracket 130 via the sleeve 134 so as not to tilt in the radial direction, so that the position of the discharge pipe 80 does not shift. There isn't.

Note that, as in the previous embodiment, the cylindrical member 132 may be lifted and lowered by a lifting device using a servo motor as a driving source.

Further, the present invention can be applied to devices other than adhesive coating devices, such as a device that applies creamy solder to a printed circuit board.

In addition, although not illustrated in detail, the present invention can be implemented with various modifications and improvements made to the elevating device based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the main parts of an adhesive coating device according to an embodiment of the present invention. FIG. 2 is a side view of the coating device, and FIG. 3 is a front view. FIG. 4 is a side sectional view showing a lifting device constituting the above device, and FIG. 5 is a plan sectional view.
FIG. 6 is a front cross-sectional view showing the main parts of a coating device according to another embodiment of the present invention, and FIG. 7 is a side view (partial cross-section) showing a lifting device constituting the coating device.
It is. 12: Y-axis table, 26: Bracket, 2
8: Lifting device, 42: Rack, 46: Gear, 4
8: sector gear, 50: gear, 52: servo motor, 54: rod, 72: cylindrical member, 80: discharge pipe, 92: large diameter gear, 94: small diameter gear, 96: servo motor, 98: syringe, 104 : Piston, 130: Bracket, 132: Cylindrical member, 1
44: Lever, 146: Roller, 150: Air cylinder.

Claims (1)

[Scope of Claims] 1. A frame, a syringe that accommodates a highly viscous fluid and injects the highly viscous fluid in predetermined amounts, a discharge pipe is attached to the lower end, and the lower end of the syringe is removably attached to the upper end. a cylindrical member attached to the frame; and a holding member attached to the frame and holding the cylindrical member, and either the cylindrical member or the holding member is movable up and down with respect to the frame. A highly viscous fluid application device characterized in that one of the devices is raised and lowered by a lifting device. 2. The high viscosity fluid application device according to claim 1, wherein a plurality of the discharge pipes are provided, and the cylindrical member is rotatably supported by the holding member and rotated by a rotational drive device.