JP3208432B2 - Screen cleaning 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 cleaning a screen used for screen printing.
In particular, it relates to removal of a printing agent in a through hole of a screen.

[0002]

2. Description of the Related Art A screen used for screen printing is provided with a large number of through holes that are opened on both front and rear surfaces at positions corresponding to positions where a printing material on a printing plate is to be printed. At the time of screen printing, the screen is superimposed on the plate to be printed, and the squeegee of the squeegee device moves on the screen, so that the printing agent placed on the screen is printed at a predetermined position on the plate to be printed through the through hole. You.

[0003] When screen printing is performed in this manner, when the printing plate is separated from the screen after printing, the printing agent adheres and remains on the inner peripheral surface of the through hole, and the printing agent is prevented from passing through the printing agent. The accuracy may be reduced, or the printing agent may adhere to the back surface of the screen that is overlaid on the printing plate, thereby soiling the printing plate. Also, if the printing agent adheres to the surface of the screen where the printing agent is placed at the end of printing, the attached printing agent deteriorates by the time printing is performed next time and mixes with the new printing agent to improve the quality of the printing agent. It is necessary to remove the printing agent adhering to the screen in various cases, for example, there is a possibility that the printing agent is lowered.

[0004]

However, conventionally,
Removal of the printing agent adhering to the screen is troublesome and time-consuming because the operator has to do so. It was particularly difficult to completely remove the printing agent in the small through holes. SUMMARY OF THE INVENTION The present invention has been made to provide a screen cleaning device capable of removing a printing agent attached to a screen without bothering humans and easily removing a printing agent in a through hole. Things.

[0005]

A feature of the screen cleaning apparatus according to the present invention is that, in order to solve the above-mentioned problems, a part of a screen is brought into contact with a part of the screen and one of the plurality of through holes of the screen. And a printing agent removing device in the through-hole for removing the printing agent inside the printer, and an X-ray parallel to the screen and parallel to the X-axis and the Y-axis, respectively. Axial direction and Y-axis direction
To the X and Y axes .
X moved to an arbitrary position on the XY coordinate plane defined Ri
Y moving device. It is desirable that the above-described printing agent removing device in the through-hole includes a printing agent suction device that suctions and removes the printing agent in the through-hole existing in a part of the screen by vacuum. In a further preferred embodiment, the printing material suction device has a longitudinal shape, and a cylindrical contact portion is provided at the free end portion to contact the screen at the open end, while the base end portion is parallel to the screen. The contact portion is attached to a movable member so as to be rotatable around a dynamic axis, and the movable member is moved by an XY movement device in two directions parallel to the X axis and the Y axis, respectively, so that the contact portion can be formed on an arbitrary portion of the screen. The contact portion is moved closer to and away from the screen by being moved to a position opposing the portion and being rotated by the rotation device about the rotation axis. The printing agent removal device in the through hole is
An air ejector for sandwiching the screen from both upper and lower sides in cooperation with the printing material suction device, and an XY moving device, wherein the air ejection device and the printing material suction device are opposed to each other with the screen interposed therebetween, on the XY coordinate plane. Is desirably moved to any position. In that case, the air injector surrounds the periphery of the air injection nozzle, and is provided with a cylindrical casing that sandwiches the screen from both sides in cooperation with the contact portion, and a suction device that sucks air in the casing. It is desirable that The printing agent removal device in the through hole may also include a solvent supply passage sandwiching the screen from both upper and lower sides in cooperation with the printing agent suction device, in which case,
It is desirable that the XY moving device be configured to move the solvent supply passage and the printing agent suction device to an arbitrary position on the XY coordinate plane in a state where they face each other with the screen interposed therebetween. In addition, it is desirable that the printing agent removing device in the through hole further includes an ultrasonic vibration head that is provided close to the solvent supply passage and that contacts the screen and transmits ultrasonic vibration to the contact portion. In the various screen cleaning device, screen, and a lowered position close to the printing plate, even cities, through-holes in the printing agent removing device includes a lifting device for lifting between a raised position spaced from the printing plate Is preferably arranged at a height position corresponding to the screen raised to the raised position by the lifting device.
The lifting device includes, for example, (a) a screen positioning and supporting device for positioning and supporting the screen substantially horizontally, (b) a screen printing machine main body, and a substantially horizontal direction by the screen printing machine main body. And a pair of levers rotatably supported around two substantially horizontal rotation axes separated from each other, and a free end of each of the pair of levers, the rotation of which is parallel to the two rotation axes. A parallelogram link device constituted by a main body of the screen positioning and supporting device rotatably connected around a dynamic axis, and (c) moving the screen positioning and supporting device with the rotation of a lever to the lower position. It is preferable that the apparatus includes a lifting drive device for raising and lowering between the lifting position and the lifting position.

[0006]

According to the screen cleaning device of the present invention, not only the back surface or the front surface of the screen but also the printing agent in the through-hole is removed well. When the screen is partially cleaned, the printing agent removing device in the through-hole is an XY moving device.
Are moved in the X-axis direction and the Y-axis direction, respectively.
The cleaning position A including region, Y-axis also in the X-axis direction
In the direction of the screen.
To clean the area. Since only necessary parts can be cleaned, the amount of air suction and the supply of compressed air can be reduced, and the apparatus can be made compact and lightweight. Further, in the like if it can take time may clean the entire surface of <br/> SCREEN, the through hole printing agent removing device when, for example, is reciprocated in the Y axis direction Perform cleaning. Each time it moves in one direction in the Y-axis direction, the printing agent removing device in the through hole is separated from the screen, moved a short distance in the X-axis direction, and then brought into contact with the screen to perform cleaning.

[0007]

As described above, according to the present invention, the printing agent adhering to the screen can be removed without bothering the human operator. The printing agent can be removed well.
In addition, a small and lightweight device effectively
Cleaning can be performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a screen cleaning device of a printed circuit board screen printing machine will be described in detail with reference to the drawings. The screen printing machine shown in FIGS. 3, 4 and 5 includes a substrate conveyor 12, a substrate positioning and supporting device 14, and a screen positioning and supporting device 1 for transporting a printed circuit board 10 (see FIG. 4) as a plate to be printed.
6, a squeegee device 18, a solder recovery device 20 (see FIG. 3), a screen transport device 22, a screen storage device 24, and a screen cleaning device 26 shown in FIG.

[0009] As shown in FIG.
A pair of rails 32 and 34 provided on the base 30 are provided. A rope (not shown) is annularly disposed on each of the rails 32 and 34, and the printed circuit board 10 is transported by circulating the rope. The distance between these rails 32 and 34 is
It can be adjusted according to the size of 0. Further, the substrate positioning and supporting device 14 includes a substrate supporting table 38 as a substrate to be printed. The substrate supporting table 38 is moved up and down by an elevating device (not shown). The printed board 10 transported by the substrate conveyer 12 and stopped by a stopper (not shown) and positioned by a positioning pin (not shown) is vacuumed. At the same time, it is lifted from the substrate conveyor 12 and brought into contact with the screen.

The screen positioning support device 16, the squeegee device 18, and the solder recovery device 20 are supported by a pair of frames 40, 42 mounted on the base 30 so as to be able to move up and down. As shown in FIGS. 3 and 5, four columns 44 are erected on the base 30, and levers 46, 47 are respectively attached to the columns 44 so as to be rotatable around a horizontal axis by a shaft 48. As shown in FIG. 5, one frame 40 is attached to a pair of levers 46 which are separated from each other in a printed board transport direction (left and right direction in the figure) so as to be rotatable around a horizontal axis, and The frame 42 is attached to the remaining pair of levers 47 so as to be rotatable around a horizontal axis.

A pair of levers 46 for supporting the frame 40
As shown in FIGS. 3 and 5, an arm 54 extends at a right angle from the portion where the frame 40 is connected to the shaft 48, and each end of the arm 54 is Are linked. The other end of one lever 46 of the pair of levers 46 is connected to a rotating plate 6 by a rod 58 disposed in a vertical direction.
0 so as to be rotatable. The rotating plate 60 is provided with a gear 6 rotated by a lifting motor 62 (see FIG. 5).
4 is fixed to the shaft 68 of the gear 66 meshed with the gear 4. Similarly, as shown in FIG. 5, arms 70 are fixed to the other pair of levers 47 supporting the frame 42 and connected by rods 72, and one of the levers 47 is a rod 74 extending in the vertical direction. And a rotating plate 75 rotatably connected to the lower end of the rod is fixed to a shaft 68. Therefore, if the shaft 68 is rotated by the lifting motor 62, the rotation plates 60 and 75 are also rotated, and the four levers 46 and 47 are simultaneously rotated by 90 degrees as shown by a two-dot chain line in FIG. Rotated, the screen positioning support device 1
6, the squeegee device 18 and the solder recovery device 20 are located right above the substrate support base 38 as shown by solid lines in FIGS. 3 and 4, and the descending end position where screen printing is performed; Is moved higher than the lower end position and to the upper end position that has moved downstream in the printed board transport direction. The above-mentioned devices 16, 18, 20 are two sets of parallelogram link devices constituted by a base 30, on which four columns 44 are erected, levers 46, 47 and frames 40, 42, and one lever 46, 47. 54, 70, rods 56, 72, and motor 62, gears 64, 6
It is moved up and down by an elevating device consisting of a drive device constituted by the rod 6 and the rods 58, 74 and the like.

The screen positioning support device 16 is provided below the frames 40 and 42. As shown in FIGS. 3 and 4, a total of four brackets 76 are fixed to the lower surfaces of the frames 40 and 42, and a screen support 78 is attached to the brackets 76, and is fixed to the screen 80 and its periphery. The screen frame 82 is supported. Screen 80
As shown in FIG. 10, through-holes are formed at positions corresponding to the print-receiving position of the printed circuit board 10 on the front surface on which the creamy solder of the screen is mounted and on the back surface brought into contact with the printed circuit board 10, respectively. The cream-like solder is printed on the printed circuit board 10 through the through holes 83. The screen support base 78 is a rectangular frame body, on which the screen frame 82 is placed, and in the X-axis direction parallel to the printed board transport direction and the Y-axis direction orthogonal to the X-axis direction in the horizontal plane. The positions are respectively positioned by an X-axis direction positioning device and a Y-axis direction positioning device, and are fixed to the screen support 78 by a fixing device.

Next, the squeegee device 18 will be described with reference to FIGS. The squeegee device 18 has a slide 84 as shown in FIG. Guide blocks 86 and 87 are fixed to both sides of the slide 84, respectively.
Guide rails 88 and 90 fixed to the frames 40 and 42, respectively, are movably fitted. Slide 84
, A nut 92 is fixed, and both ends are screwed to a screw shaft 94 supported by one frame 42, and the screw shaft 94 is connected to a squeegee moving servomotor 96.
(See FIG. 11), the slide 84 is moved in the X-axis direction.

A frame 100 is fixed on the slide 84. As shown in FIGS. 6 and 8, the frame 100 includes a pair of side walls 102, a top wall 104, and a back wall 106.
The slide 84 and the frame 100
Are provided with a first squeegee unit 108 and a second squeegee unit 110. These units 108,
The configuration of the first squeegee unit 10 is the same.
8 will be described in detail.

The first squeegee unit 108 has a first squeegee 112 and is provided with a first squeegee elevating unit 117 which is raised and lowered by a pair of first squeegee elevating air cylinders 114 and 116 (see FIG. 6). These air cylinders 114 and 116 are fixed downward on the top wall 104 and spaced apart in the Y-axis direction, and their piston rods 118 and 120 (see FIG. 6) are inserted through the top wall 104 and their lower ends. Rods 12 respectively fixed to the parts
2 and 124 (see FIG. 7) are axially slidably fitted to a pair of guide tubes 126 and 128 erected on the slide 84, and the squeegee holder 130 is rotatable at the lower end thereof. Are linked.

As shown in FIG. 8, the squeegee holder 130 has a square member 132, brackets 134 and 136 fixed to both ends of the square member 132 in the longitudinal direction, and a support member having both ends fixed to the brackets 134 and 136. Member 1
38 has a fixed mounting plate 140. As shown in FIG. 7, elongated holes 142 and 144 are respectively formed at two places in the longitudinal direction of the timber 132 at a distance in the longitudinal direction.
The lower ends of 22, 22 are fitted respectively,
It is rotatably connected to the square member 132 by pins 146 and 148 parallel to the moving direction of the slide 84. Rod 1
The inner diameters of the pin holes 150 and 152 in which the pins 146 and 148 of the pins 22 and 124 are fitted are slightly larger, and the squeegee holder 130 can rotate a small angle in a vertical plane including the rods 122 and 124. .

The first squeegee 112 is mounted on the mounting plate 140 as shown in FIG. The first squeegee 112 has a long plate shape, and includes a first squeegee member 154 made of rubber and held by a squeegee holder 156. The lower end of the first squeegee member 154 is inclined and held in a direction away from the second squeegee unit 110. The first squeegee 112 includes the squeegee holder 15.
At 6, it is fixed to the mounting plate 140 and rotates together with the squeegee holder 130 in a vertical plane. In FIG. 7, 1
Numerals 58 are shielding plates attached to both ends in the longitudinal direction of the squeegee holder 156 to prevent the creamy solder from protruding during printing. When the size of the printed circuit board 10 changes, the first squeegee 112 is attached to and detached from the squeegee holder 130, and the first squeegee member 154 is formed.
Is exchanged for one having a length corresponding to the dimensions of the printed circuit board 10.

As shown in FIG. 7, a long hole 160 is formed in the center of the square member 132 in the longitudinal direction, and the lower end of a lifting rod 162 is fitted therein.
Is rotatably connected to the square member 132. The lifting rod 162 has a through hole 165 formed in the slide 84.
, And is urged upward by a spring 170 disposed between a spring receiver 166 attached to the projecting end and a spring receiver 168 fixed to the lower surface of the slide 84. Accordingly, the first squeegee 112, the squeegee holder 130, the piston rods 118 and 120, the rod 1
22, 124, lifting rod 162 and spring receiver 166
And the like, and lift air cylinders 114, 116.
Therefore, the weight of the first squeegee elevating unit 117 which is raised and lowered by the above is reduced. In this embodiment, the spring 17
When the first squeegee 112 is lowered until the first squeegee 112 comes into contact with the screen 80, the weight of the spring load is reduced to zero, and the spring load is set so that no weight is applied to the screen 80. Therefore, the first squeegee member 154
When the pressure of the air supplied to the upper air chambers of the air cylinders 114 and 116 is zero, the screen 80 contacts the screen 80 with zero force, and the contact force increases as the air pressure increases.
During non-printing, the upper chambers of the air cylinders 114 and 116 are released to the atmosphere, while air is supplied to the lower chamber, and the first squeegee 112 is raised to the raised end position and separated from the screen 80. . A dog 172 is mounted on the spring receiver 166, and the lower end of the first squeegee member 112 is detected by a squeegee lower end sensor 174.

The second squeegee unit 110 has the same configuration, and the second squeegee elevating unit 178 is moved up and down by a pair of second squeegee elevating air cylinders 180 (only one is shown in FIG. 8). A rod 184 is connected to the lower end of the piston rod 182 of the second squeegee elevating and lowering air cylinder 180.
Squeegee holder 1 rotatably attached to the lower end of the squeegee
A second squeegee 188 is attached to 86. The second squeegee 188 is formed by holding a long plate-shaped rubber second squeegee member 190 by a squeegee holder 192, and the lower end of the second squeegee member 190 is inclined in a direction away from the first squeegee member 154. And are held. Further, the lifting rod connected to the square member of the squeegee holder 186 is urged upward by a spring, and the second squeegee 188 and the squeegee holder 18 are urged upward.
6, the piston rod 182, the rod 184, and an elevating rod (not shown) constitute a second squeegee elevating unit 178, and the weight of the second squeegee elevating unit 178 is reduced by a spring. The spring load of this spring is sized so that the weight applied to the screen 80 when the second line 188 just contacts the screen 80 becomes zero. By controlling the air pressure supplied to the air cylinder 180, the spring load is increased. The contact pressure of the squeegee member 190 against the screen 80 can be adjusted. Further, the falling end of the second squeegee member 188 is detected by the dog 194 and the second squeegee falling end sensor 196.

The first squeegee 112 and the second squeegee 188 are used alternatively. Screen printing is performed by moving the squeegee from one side of the printed circuit board 10 to the other side, and the squeegee located upstream in the moving direction is used for printing. When two sets of squeegees are provided as described above, reciprocal printing can be performed by selectively using them according to the printing direction.

Next, the solder collecting device 20 will be described. As shown in FIG. 8, a pair of guide rails 200 (only one is shown in the figure) extending vertically are provided on the back wall 106 of the frame 100 at a distance in the Y-axis direction. 202 is a guide block 204, 20
At 6, it is fitted so as to be able to move up and down. This lifting plate 20
2, a plate 207 is fixed in a direction in which the plate 207 extends upward, and a piston rod 210 of a scooping member elevating / lowering air cylinder 208 provided on the top wall 104 is connected by a bracket 211. The elevating plate 202 is moved up and down by the expansion and contraction of.

The lower end of the lift plate 202 is defined by a bolt 212 screwed to the lower surface thereof abutting a stopper bolt 214 fixed to the slide 84. A mechanical valve 216 is attached to the side wall 102 of the frame 100 as shown in FIG.
02 can be switched between high and low speeds. As shown in FIG. 9, a switching plate 218 is fixed to the elevating plate 202. At the time of elevating and lowering, the first switching surface 220 protruding toward the mechanical valve 216 and the second switching surface 222 retracted therefrom are sequentially provided with the mechanical valve. 216, the switching lever 224 is brought into contact with the switching lever 224.
24, the switching lever 224 is moved to the first
20, the amount of air supplied to the air cylinder 208 is reduced and the vertical speed is reduced. On the other hand, in the state of contact with the second switching surface 222, the amount of air supplied is increased and the vertical speed is increased.

As shown in FIGS. 7 and 8, a support plate 232 is provided from both ends in the width direction of the lower end of the elevating plate 202, respectively.
Are extended forward. Each of these support plates 232 has a substantially L-shape, and is inserted into a notch 236 formed in the slide 84, and an arm 234 extending in the vertical direction faces a side surface of the squeegee holder 130 of the first squeegee unit 108. Have been allowed. A scooping device 237 is rotatably attached to these support plates 232. The scooping device 237 includes a pair of L-shaped brackets 238, a mounting plate 242 attached to each of the L-shaped arm portions 240 of the brackets 238, and a scooping device fixed to the tips of the mounting plates 242. A member 244 is fitted in a long hole 248 (see FIG. 7) formed in the support plate 232 at the other arm 246 of the bracket 238, and is rotatably attached by a pin 250.

A notch 252 is formed in the lower surface and the distal end surface of the arm portion 240, and the mounting plate 242 is fitted into the notch 252 at one end thereof.
It is supported by a pin 253 so as to be rotatable around an axis parallel to the Y-axis direction. This mounting plate 242 is used for the arm 2
The other end is urged toward the screen 80 by a spring 256 disposed between the lower surface of the plate 40 and a fixed plate 254. Reference numeral 258 denotes a bolt that regulates the urging force of the spring 256. The scooping member 244 is longer than the first squeegee member 154 and
The pair of side walls 262 at both ends are respectively located on both sides in the longitudinal direction of the first squeegee member 154 as shown by a two-dot chain line in FIG. Rake member 244
Are exchanged according to the size of the first squeegee member 154, and have a length such that the side wall 262 can always sandwich the first squeegee member 154 from both sides in the longitudinal direction. The bottom wall of the scooping member 244 is curved along an arc centered on the axis of the pin 250, and the upper surface thereof is a partially cylindrical scooping surface 266. A knife edge 268 is formed at the tip of the scooping member 244.

The pair of brackets 238 are connected by a horizontally disposed rod 270, and a piston rod 274 of a scooping member rotating air cylinder 272 is connected to a joint member 276 at the longitudinal center of the rod 270. Are connected so as to be rotatable. The air cylinder 272 is rotatably connected to a plate 207 attached to the elevating plate 202 by a pin 280.
38 is rotated and the scooping member 244 is moved along the screen 80.

As shown in FIG. 7, a pin 284 is fitted to the lower end of the arm portion 234 of the support plate 232 so as to be movable in the Y-axis direction, and is moved by a pin driving cylinder 286. ing. In the upper ends of the brackets 134 and 136 of the squeegee holder 130, fitting holes which are almost concentric with the pins 284 when the first squeegee 112 is lowered to the lower end and the lifting plate 202 is lowered to the lower end. The elevating plate 202 and the first squeegee 112 are connected by fitting the pin 284 into the fitting hole 288.

Screen 8 used for screen printing
A value of 0 is replaced with another screen 80 when necessary, such as when printing is performed for a predetermined number of times or when the type of the printed circuit board 10 is changed. The screen transport device 22 includes:
The screen 80 is conveyed between the screen positioning support device 16 and the screen accommodating device 24, and the screen is automatically exchanged.
This is the same as the device described in JP-A-317768, and will be briefly described.

As shown in FIGS. 3 and 4, the screen transport device 22 includes an X-axis slide 29 that moves in the X-axis direction.
0, and a Y-axis slide 292 provided on the X-axis slide 290 and moving in the Y-axis direction. Each of the X-axis slide 290 and the Y-axis slide 292 is provided with an engagement member that engages with the screen frame 82, and pulls out the screen frame 82 from the screen support base 78 and conveys the screen frame to the screen storage device 24. The screen accommodating device 24 has upper and lower two-stage screen accommodating portions which are moved up and down by the elevating device. The screen accommodating portions are selectively positioned at the screen transfer position, and are removed from the screen support base 78. 80 is accommodated and provides a new screen 80, which is
Is transferred to the screen support base 78, and is positioned and fixed. In the screen storage device 24, a stocker capable of storing ten screens 80 vertically may be moved up and down by an elevator to transfer the screens 80.

Next, the screen cleaning device 26 will be described. As shown in FIGS. 4 and 5, the screen cleaning device 26 is located at a position adjacent to the screen accommodating device 24 of the frame 300 fixed on the base 30 and above the screen transporting device 22 and at the rising end position. It is provided at a height corresponding to the moved screen 80. As shown in FIG. 2, the screen cleaning device 26 includes an X-axis slide 306 that is guided by a guide rail 304 and is moved in the X-axis direction when the ball screw 301 is rotated by an X-axis drive motor 302. A Y-axis slide 312 (see FIG. 1) provided on the X-axis slide 306 and guided by the guide rail 310 and moved in the Y-axis direction by the ball screw 307 being rotated by the Y-axis drive motor 308. Have.

On the Y-axis slide 312, an elongate air ejector 316 and a solder suction unit 318 are provided so as to be rotatable around an axis parallel to the X-axis direction. A bracket 320 is fixed on the Y-axis slide 312,
U-shaped brackets 324 and 326 are fixed to upper and lower surfaces of a support member 323 fixed between the pair of side plates 322 of the bracket 320, respectively. The main body 328 of the air injector 316 has a tubular shape with a rectangular cross section, and is attached to a lower bracket 326 so as to be rotatable around an axis parallel to the X-axis direction by a shaft 332 on a lower bracket 326 fixed to the upper surface thereof. Have been. The main body 334 of the solder suction device 318 also has a tubular shape with a rectangular cross section. A bracket 336 fixed to the lower surface of the main body 334 is attached to an upper bracket 324 by a shaft 338 so as to be rotatable around an axis parallel to the X-axis direction. Have been.

A support plate 340 is fixed to the support member 323, and an air cylinder 342 for rotating an injector and an air cylinder 344 for rotating an aspirator are attached downward and upward, respectively.
48 is a bracket 350, 352 fixed to the rear end of the main body 328, 334 (the end opposite to the screen 80 side).
Are rotatably connected to the Therefore, the expansion and contraction of the piston rods 346 and 348 causes the air ejector 316 and the solder suction device 318 to rotate in opposite directions, and their tips (ends on the screen 80 side) approach and separate from each other. It will be. The rotation of the tip of the air ejector 316 and the tip of the solder sucker 318 approaching each other is defined by a stopper (not shown).

A cylindrical casing 358 is fixed to the upper surface of the tip of the main body 328 of the air injector 316.
An air injection nozzle 360 is disposed in the casing 358 so as to face upward. The air injection nozzle 360 is provided at a cylindrical connection portion 362 and at an upper end of the connection portion 362,
A thin box-shaped injection portion 364 having a width substantially equal to the width of the casing 358, and the injection portion 364 is formed with a large number of air injection openings formed on the upper surface thereof in a row in the X-axis direction. I have. The air injection nozzle 360 is provided in the main body 328, and has a pipe 366 having one end connected to the connection portion 362.
Tube 3 connected to tube 366 at the rear end of body 328
68 to a compressed air supply 370
The air supplied from the compressed air supply source 370 is injected from the air injection nozzle 360 directly above the air injection nozzle 360 at a speed sufficient to push out the creamy solder attached to the inner peripheral surface of the through hole 83 from the through hole 83. .

In the casing 358, a brush 374 is attached by an axis 376 adjacent to the air injection nozzle 360.
It is mounted rotatably about an axis parallel to the axial direction. The rotation of the brush drive motor 378 (see FIG. 2) is
And the brush 374 is rotated.

Further, the space inside the main body 328 is connected to a vacuum source 398 via a hose 388, a joint member 390, a hose 392, a solder collecting box 394, and a hose 396 connected to the rear end. Solder collection box 39
The space in 4 is divided into two chambers 402,
404 and a main body 328 in one chamber 402.
Is connected, and a vacuum source 398 is connected to the other chamber 404. The chambers 402 and 404 are connected at a lower portion, and the vacuum is supplied to the main body 328 through this portion.
6 is provided so that the cream solder sucked by the vacuum is not sucked into the vacuum source 398 as described later. The solder collection box 39
The lower part of 4 is a detachable receiving box 408 so that the creamy solder that has been sucked and accumulated can be discarded.

A cylindrical guide member 410 is fixed to the lower surface of the tip of the main body 334 of the solder suction device 318.
A cylindrical contact member 412 is fitted to the guide member 410 so as to be relatively movable in the axial direction and not to come out. The space in the main body 334 is also connected to a vacuum source 398 via a hose 414, the joint member 390, a hose 392, a solder collecting box 394, and a hose 396.

The screen printing machine is controlled by a control device 420 shown in FIG. The control device 420 is mainly composed of a computer, and includes the elevating motor 62 for raising and lowering the squeegee device 18 and the like, the squeegee device 18
Squeegee moving servomotor 96, first squeegee elevating air cylinders 114 and 116, second squeegee elevating air cylinder 180, scooping member elevating air cylinder 208, scooping member rotating air cylinder 272, screen cleaning X-axis drive motor 30 of device 26
2, the Y-axis drive motor 308, the injector rotation air cylinder 342, the suction unit rotation air cylinder 344, the compressed air supply source 370, and the vacuum source 398. 14, a screen transport device 22, and a screen storage device 24 are connected. These are controlled in accordance with a program stored in the ROM of the computer, and the transfer of the printed circuit board 10, positioning, screen printing, replacement of the screen 80, cleaning, recovery of creamy solder, and the like are performed.

Next, the operation will be described. When cream solder is printed on the printed circuit board 10 in the screen printing machine configured as described above, the screen positioning support device 16, the squeegee device 18, and the solder recovery device 20 are used.
Is at the lower end position, the screen 80 is positioned and fixed on the screen support base 78, and the creamy solder kneaded to have an appropriate viscosity is placed thereon. In the squeegee device 18, the slide 84 is located at one end in the X-axis direction in the printing area of the screen 80, and the first and second squeegees 112 and 188 and the scooping member 244 are provided.
Are at the rising end position. And the printed circuit board 1
0 is transported by the substrate conveyor 12 and the substrate support 3
8, the squeegee used for printing is lowered from the first and second squeegees 112 and 188 to contact the screen 80, and the slide 84 moves. The cream solder is printed on the printed circuit board 10.

If the first squeegee 112 is used for printing, air is supplied to the upper chambers of the air cylinders 114 and 116, and the lower chamber is released to the atmosphere. And brought into contact with the screen 80. At this time, since the weight of the first squeegee elevating unit 117 is exactly canceled by the spring 170 as described above, the first squeegee member 15
4 is brought into contact with the screen 80 only by the air pressure supplied to the air cylinders 114 and 116. Regardless of the weight of the first squeegee elevating unit 117, the first squeegee member 154 can be brought into contact with the screen 80 at a desired pressure, and a pressure gauge is provided between the air cylinders 114 and 116 and the air supply source. The air cylinder 1
It is possible to know the magnitude of the pressure of the air supplied to the screens 14, 116, and thus the contact pressure to the screen 80.

The first squeegee member 154 has two air cylinders 1 at positions separated in the longitudinal direction.
Since the screen 80 is brought into contact with the screens 14 and 116, the contact pressure can be adjusted arbitrarily. For example, even if the printed circuit board 10 and the screen 80 are inclined, the first squeegee member 154 rotates around the pins 164 and follows the pins 164, so that the first squeegee member 154 contacts the screen 80 with uniform pressure. In addition, the contact pressure at both ends can be intentionally made different. Thereby, for example, the through hole 8 formed in the screen 80 is formed.
In the case where the diameter of 3 is extremely small and cream-like solder is difficult to enter, the cream-like solder is reliably printed by increasing the contact pressure of the portion of the first squeegee member 154 moving on the through hole 83. And the like.

It is not indispensable that the entire weight of the first squeegee elevating section 117 does not hang on the screen 80, but a part of the weight may be applied. When it is necessary to increase the contact pressure, the supply air pressure can be reduced by applying the weight of the first squeegee elevating unit 117 to the screen 80.

As described above, if the slide 84 moves and the solder paste is printed on one printed circuit board 10, the first squeegee 112 is raised, and after the printed circuit board 10 is discharged, a new one is formed. When the printed board 10 is brought into contact with the screen 80, the second squeegee member 190 is brought into contact with the screen 80 and printing is performed. At this time, the weight of the second squeegee elevating unit 117 is not applied to the screen 80, and the second squeegee member 190 is brought into contact with the screen 80 only by the air pressure supplied to the second squeegee elevating air cylinder 180.
This is the same as the case of the first squeegee member 154.

When a predetermined number of sheets are printed or when the type of the printed circuit board 10 changes, the screen 80 is replaced. If creamy solder remains on the replaced screen 80, the screen 80 is replaced. The cream solder hardens and causes dirt and clogging, and such creamy solder cannot be reused, resulting in waste. Therefore, at the time of screen replacement, first, the creamy solder remaining on the screen 80 is recovered by the solder recovery device 20.

At the end of printing, the cream solder is at one end in the squeegee moving direction in the printing area of the screen 80, and the first squeegee 112 and the scooping member 244 are above the cream solder. The first and second squeegees 112 and 188 are both at the rising end position,
The scooping member 244 is also at the raised end position. From that state, the first squeegee member 154 is moved downward by a small distance after the first squeegee 112 is lowered as shown by the solid line in FIG. 8 and the scooping member 244 is lowered as shown by the two-dot chain line. Then, the first squeegee member 154 is brought into contact with the creamy solder. Subsequently, the pin 284 is fitted into the fitting hole 288, and the first squeegee 1
After the 12 and the scooping member 244 are integrally connected, the scooping member 244 is rotated clockwise in FIG. 8 and moves toward the first squeegee 112 while pressing the creamy solder on the screen 80. I do.

The scooping member 244 includes a spring 256
As a result, the tip is urged downward so that the tip contacts the screen 80 before rotating until it approaches the first squeegee member 154, and the knife edge 268 is pressed against the screen 80. State. Therefore, when the scooping member 244 is further rotated, the knife edge 268 moves along the screen 80 and moves toward the first squeegee member 154 while scraping the creamy solder, as shown by the solid line. In a state where the knife edge 268 is close to the first squeegee member 154, the knife edge 268 enters between the cream-like solder stopped by the first squeegee member 154 and the screen 80 to scoop up the cream-like solder on the scooping surface 266. Considering the first squeegee member 154, the surface of the side opposite to the second squeegee member 190 rakes the creamy solder onto the scooping surface 266 and makes the scooping member 244 scoop. The scooping member 244 has a knife edge 268 formed by the first squeegee member 15.
4 and is not contacted with the first squeegee member 154, so that the rubber first squeegee member 154 is not damaged by the knife edge 268. .

After scooping, with the two chambers of the first squeegee elevating air cylinders 114 and 116 both open to the atmosphere, the elevating plate 202 is raised and the slide 84 is moved a short distance to the left in FIG. Moved at low speed towards. When the lifting plate 202 is lowered to the lower end, the second switching surface 222 of the switching plate 218 switches the lever 224 of the mechanical valve 216, and the lifting plate 202 moves up and down at a low speed. Therefore, the scooping member 244 and the first squeegee 11 connected by the pin 284
2 is moved slowly and obliquely upward, and the scooping member 244 rises while scraping the creamy solder on the screen 80. Rake member 2
44 and the first squeegee member 154, but the creamy solder has viscosity and
44 and the first squeegee member 154 are moved obliquely upward at a low speed, so that the creamy solder in the gap between the scooping member 268 and the first squeegee member 154 is scooped from the screen 80, and , Do not leak from between them.

When the first squeegee member 154 and the scooping member 244 are raised and moved by a small distance, the movement is stopped, and the squeegee member 154 and the scooping member 244 are raised at a high speed to the rising end position. In this state, the first squeegee member 154 and the scooping member 244 are separated from the screen 80, and the recovery of the creamy solder has been completed. After the creamy solder is scooped from the screen 80, the screen 80 is cleaned by the screen cleaning device 26 as described later.
After the cleaning, the screen 80 is conveyed by the screen conveying device 22 and accommodated in the screen accommodating device 24, and a new screen 80 is conveyed and positioned and fixed on the screen support base 78.

After fixing the new screen 80, the recovered cream solder is returned to the screen 80.
In this case, first, the solder collecting device 20
0, the first squeegee 112 and the scooping member 24 are moved to one end in the squeegee moving direction.
4 is lowered and brought into contact with the screen 80.
In this case, at the beginning of the lowering of the lifting plate 202, the second switching surface 222 of the switching plate 218 switches the lever 224 of the mechanical valve 216 and is lowered at a high speed. Is switched, and the screen 80 is lowered at a low speed, so that the screen 80 can be brought into slow contact with the screen 80 without damaging the screen 80.

After descending, the pin 284 is disengaged from the fitting hole 288 and the first squeegee 112 and the scooping member 24 are removed.
The connection with 4 is broken. Then, after the first squeegee 112 is raised, the second squeegee 188 is lowered as shown by a two-dot chain line in FIG. 8 to come into contact with the scooping surface 266, and then the scooping member 244 is moved to the position shown in FIG. Is rotated in the counterclockwise direction, the cream-like solder on the scooping surface 266 is removed from the second squeegee member 190.
Is scraped off on the screen 80. The cream-like solder is scraped down by the surface of the second squeegee member 190 on the side facing the first squeegee member 154, and then the second squeegee 188 and the scooping member 2
44 are respectively raised to the rising end positions, and the screen printing is started.

When screen printing is first performed by the second squeegee 188, it is not necessary to raise the second squeegee 188, and the screen printing is started as it is. This can be achieved by returning the creamy solder to the side where printing is started by the second squeegee 188.

As described above, the creamy solder remaining on the screen 80 is automatically collected by the solder collecting device 20, and is automatically returned to the screen 80, so that the operator performs the collecting and returning operation. Work is performed more quickly than in the case, and the recovered cream-like solder is used for the next screen printing, and the waste of the cream-like solder can be eliminated. No more staining. Further, there is almost no creamy solder that remains on the screen 80 and hardens, and an effect of facilitating the cleaning of the screen 80 can be obtained.

As described above, in the screen 80 used for printing, as the number of times of printing increases, creamy solder adheres to the inner peripheral surface of the hole and remains, or the back surface (printed board 10).
Adheres to the surface of the printed circuit board 10 on which
May be soiled. Therefore, when a predetermined number of prints have been performed, when it is determined that the through-hole 83 is clogged by detecting the print result, when the screen 80 is replaced, or when the operation is temporarily interrupted, The screen 80 is cleaned by the screen cleaning device 26 at appropriate times.

When the screen is not cleaned, the screen cleaning device 26 is at a retracted position separated from the screen 80 as shown in FIG. During screen cleaning, the screen 80 is moved to the rising end position. And the screen cleaning device 2
6, the distal ends of the air ejector 316 and the solder suction device 318 are separated from each other as shown in FIG.
6 is located below the screen 80 and the solder suction device 318
Are moved in the X-axis direction and the Y-axis direction in a state where they are located above, and their leading ends are moved to a position on the screen 80 to be cleaned.

After the movement, as shown in FIG. 1, the tips are brought close to each other, and the screen 80 is sandwiched from both sides. At this time, the rotation of the air ejector 316 and the solder suction device 318 is regulated by a stopper (not shown), and the guide member 410 and the contact member 412 relatively move at the distal end of the solder suction device 318, so that It is avoided that the air ejector 316 and the solder suction device 318 pinch the screen 80 with excessive pressure.

In this state, compressed air is supplied to the air injection nozzle 360 and is blown at right angles to the screen 80. The compressed air is sprayed at a speed sufficient to push out the cream solder adhered to the inner peripheral surface of the through hole 83, whereby the cream solder adhered to the inner peripheral surface of the through hole 83 is blown up and removed. The creamy solder is sucked by the solder sucker 318 and stored in the solder collecting box 394 and accumulated in the receiving box 408. In this embodiment,
The air ejector 316, the solder suction device 318, the compressed air supply source 370, and the vacuum source 398 constitute a through-hole printing agent removing device. The brush 374 is rotated at the same time as the compressed air is blown, and the screen 8 is rotated.
The creamy solder attached to the back surface of the air ejector 316 is removed, and the removed creamy solder is sucked by the vacuum in the main body 328 of the air ejector 316 and accumulates in the receiving box 408.

When the screen 80 is partially cleaned, the air ejector 316 and the solder suction device 318 are moved to a narrow area including the cleaning position, and the area is moved in the X-axis direction and the Y-axis direction. Cleaning is performed. Since only necessary parts can be cleaned, the amount of air suction and the supply of compressed air can be reduced, and the apparatus can be made compact and lightweight. If there is time, etc., the entire surface of the screen 80 may be cleaned. In that case, the air ejector 316 and the solder suction device 318 are reciprocated in the Y-axis direction to be cleaned. After each movement in one direction in the Y-axis direction, the tip of each of the air ejector 316 and the solder suction device 318 is separated from the screen 80, and after moving slightly shorter than the width of the air ejection nozzle 360 in the X-axis direction. The cleaning is performed by bringing the screen 80 into contact with the screen 80. After the cleaning, the air ejector 316 and the solder suction device 318 are opened and retracted, and the screen 80 is returned to the lower end position. The cream-like solder accumulated in the solder collecting box 394 is discarded after removing the receiving box 408.

When the screen 80 is cleaned,
A solvent may be sprayed before the cream solder is removed by the brush 374.

Another embodiment of the present invention is shown in FIG. In this embodiment, an air supply device 430 is provided in place of the air injection device 316, and compressed air is applied to the through hole 83 of the screen 80 with a pressure sufficient to push out the creamy solder attached to the inner peripheral surface of the through hole 83. And the solder suction device 43
1, the extruded creamy solder is sucked. The air supply device 430 has a longitudinal shape, and is provided rotatably about an axis parallel to the X-axis direction, similarly to the air injector 316. Its body 432
Is bent toward the screen 80, has a cross-sectional area larger than the cross-sectional area of the through hole 83, has an air passage 434 formed therein, and has an air passage 4
A rubber seal 436 that seals the opening 34 is attached. The air passage 434 has a compressed air supply source 438.
And compressed air having a pressure sufficient to extrude the creamy solder adhered to the inner peripheral surface of the through hole 83 is supplied.

The solder suction device 431 has a longitudinal shape and is provided rotatably about an axis parallel to the X-axis direction, similarly to the solder suction device 318. Its body 442
Is bent toward the screen 80, has a cross-sectional area larger than the cross-sectional area of the through hole 83, and has a vacuum passage 444 formed therein to be connected to a vacuum source 446. A rubber tubular member 448 is fixed to the tip of the main body 442 and extends from the main body 442. In this embodiment, the solder suction device 431, the vacuum source 446, the air supply device 430, and the compressed air supply source 438 constitute a printing agent removing device in the through hole.

When cleaning the screen, the air supply device 430 is used.
The solder suction device 431 is moved in the X-axis direction and the Y-axis direction, and the screen 80 is sandwiched from both the front and rear sides in a state where the tip ends thereof are moved to the cleaning position of the screen 80. Each contacts the front and back surfaces of the screen 80. At this time, the excessive rotation amount of the solder suction device 431 is absorbed by the bending of the tubular member 448. Further, the air passage 434 and the vacuum passage 444 are sealed, and compressed air having a pressure sufficient to push out the cream solder adhered to the inner peripheral surface of the through hole 83 is supplied to the air passage 434. Is extruded from the through hole 83 and is sucked by the solder suction device 431. The compressed air jetted from the air passage 434 pushes the screen 80, but the screen 80 is pressed by the cylindrical member 448, so that the screen 80 is prevented from floating. In this embodiment, it is desirable to provide a brush and clean the back surface of the screen 80 in the same manner as in the above embodiment.

In each of the above embodiments, the cream-like solder extruded from the through-hole 83 is suctioned and collected by a vacuum. It may be collected by other means, such as providing a container in the container. In the case where the container is provided, for example, as shown in FIG. 13, a solder collector is attached to the tip of a rod 450 provided rotatably around an axis parallel to the X-axis direction (the direction perpendicular to the paper surface in the figure). Attach 452.

The solder collector 452 has a receiving box 454 placed on the screen 80 for receiving creamy solder, and a dome-shaped shield 456 attached to the receiving box 454 so as to extend upward. The receiving box 454 has a dimension in the X-axis direction slightly larger than the width of the air injection nozzle 458 similar to the air injection nozzle 360, and the bottom wall has
An opening 460 whose dimension in the X-axis direction is slightly larger than the width of the air injection nozzle 458 and whose dimension in the Y-axis direction (left-right direction in the drawing) is larger than the diameter of the through hole 83 is provided. Further, the shield 456 is made of a fine metal mesh that allows the passage of air but blocks the passage of the creamy solder extruded from the through hole 83.

When cleaning the screen 80, the solder collector 452 and the air injection nozzle 458 are moved to the cleaning position of the screen 80, and the air is collected from the air injection nozzle 458 while the solder collector 452 is placed on the screen 80. Is injected. Then, the cream-like solder extruded from the through-hole 83 is prevented from being scattered around by the shield 456 and hits the shield 456 and falls.
It is stored in the receiving box 454. In the present embodiment, the air injection nozzle 458 and the compressed air supply source (not shown) constitute a through-hole printing agent removing device.

It should be noted that it is not indispensable to collect the cream solder as described above. If the situation around the screen printing machine does not require the cream solder to be pushed out from the through-hole 83, the solder may not be collected. Good.

FIG. 14 shows still another embodiment of the present invention.
In the present embodiment, the cream-like solder attached to the inside of the through hole 83 of the screen 80 is removed by suction using a vacuum. The solder suction device 470 has a longitudinal shape and is provided on a table that moves in the X-axis direction and the Y-axis direction so as to be rotatable around an axis parallel to the X-axis direction. The tip of the main body 472 of the solder suction device 470 is bent toward the screen 80, and a vacuum passage 474 is formed in the inside thereof, and a rubber seal 47 that seals the opening of the vacuum passage 474 on the tip surface.
6 is attached. The vacuum passage 474 is connected to a vacuum source 478, and the solder suction device 470 together with the vacuum source 478 constitutes a printing agent removing device in a through hole.

At the time of cleaning, the solder suction device 470 is moved in the X-axis direction and the Y-axis direction, and the tip is brought into contact with the surface of the screen 80 while the tip is moved to the cleaning position of the screen 80. Alternatively, they face each other with a slight gap therebetween. When vacuum is supplied to the vacuum passage 474 in this state, the screen 80 is attracted to the distal end surface of the main body 472, and the vacuum passage 474 is sealed by the seal 476.
The cream supplied to the inner peripheral surface is sucked by the vacuum supplied to 3. It is particularly effective that the suction by the solder suction device 470 is performed simultaneously with the injection of the solvent onto the back surface of the screen 80 and the cleaning with the brush.

The solder suction device 470 is connected to the screen 8
0, and from the back side of the screen 80 through holes 8
The cream solder in 3 may be sucked.

FIGS. 15 to 17 show still another embodiment of the present invention.
Shown in The screen cleaning device 480 of this embodiment includes an ultrasonic cleaner 482 and a solder suction device 484.
These ultrasonic cleaning device 482 and solder suction device 484 are
Similarly to the air ejector 316 and the solder suction device 318, provided on the X-axis slide 486 and the Y-axis slide 488, the main body 490, 492 is moved in a horizontal plane in the X-axis direction and the Y-axis direction. Is
It is connected to the piston rods 498 and 500 of the air cylinder 494 for rotating the washer and the air cylinder 496 for rotating the aspirator, and is rotated in opposite directions so that the tips thereof are moved closer to and away from each other. ing. In addition, the structure for rotatably supporting the main bodies 490 and 492 is described with reference to FIGS.
This is the same as the embodiment shown in FIG. 11, and the corresponding portions are denoted by the same reference characters and description thereof will be omitted.

As shown in FIG. 16, a bottomed cylindrical casing 504 is fixed on the upper surface of the distal end portion of the main body 490 of the ultrasonic cleaner 482 with the opening thereof facing upward. A sonic vibration head 506 is housed. Since the ultrasonic vibration head 506 is well known, its illustration is omitted, and only the position is indicated by a two-dot chain line.
It has a magnetostrictive vibrator, cone and horn.
The horn is a wedge-shaped horn having a rectangular cross-sectional shape and a smoothly decreasing thickness toward the tip. The upper end surface of the horn is slightly projected from the upper end of the casing 504, and vibrates ultrasonically.

Inside the ultrasonic vibration head 506, there is provided a solvent supply passage 508 which penetrates the center and opens upward. The solvent supply passage 508 is connected to the solvent supply source 514 by a tube 510 provided in the main body 490 and a tube 512 shown in FIG. The solvent supply source 514 supplies an alcohol-based solvent, and in this embodiment, the solvent is caused to flow out from the upper end opening of the solvent supply passage 508 little by little.

The space inside the casing 504 is the same as that shown in FIG.
6, the bottom wall of the casing 504 and the body 4
The plurality of openings 518 formed through the opening 90 communicate with the space inside the main body 490. The space inside the main body 490 is connected to a vacuum source 532 via a hose 520, a joint member 522, a hose 524, a solvent processor 526, and a hose 528 in FIG. 15, so that the vacuum is supplied into the casing 504. Has become.

The solvent processing unit 526 processes an alcohol-based solvent containing creamy solder. For example, the solvent processing unit 526 contains a solution in which the solvent dissolves and stores the creamy solder while preventing the solvent from evaporating. It is said that it burns the solvent and stores the remaining creamy solder.
Various aspects can be adopted.

A sealing member 536 made of rubber is provided on the peripheral edge of the upper end of the casing 504 in which the ultrasonic vibration head 506 is housed.
Is attached. The seal member 536 is provided on an attachment portion 538 attached to the casing 504, an upper end of the attachment portion 538, an elastic deformation portion 540 having a U-shaped cross section, and equidistantly provided on an upper surface of the elastic deformation portion 540. And a plurality of ridges 542. Therefore, when the ultrasonic cleaner 482 and the solder suction device 484 sandwich the screen 80, the casing 504 comes into contact with the back surface of the screen 80 at the ridge 542 of the seal member 536, and between the seal member 536 and the back surface of the screen 80. Are two adjacent ridges 542, an elastic deformation portion 540, and a screen 8.
A plurality of gaps 544 surrounded by 0 are formed.

The solder suction device 484 is connected to the solder suction device 31.
8, a cylindrical guide member 54 is attached to the tip of the main body 492.
8 is fixed, and the guide member 548 has a cylindrical contact member 5.
50 is fitted so as to be relatively movable in the axial direction and not to come out. As shown in FIG. 17, a plurality of projections 552 extending in the axial direction are provided at the lower end of the abutting member 550 that abuts on the screen 80, and the tips of the projections 552 are hemispherical. Therefore, when the solder suction device 484 sandwiches the screen 80 together with the ultrasonic cleaner 482, the contact member 550 comes into contact with the screen 80, but between the contact member 550 and the screen 80, two adjacent protrusions are provided. A gap 554 surrounded by the screen 552, the screen 80 and the contact member 550 is formed.

The space inside the main body 492 of the solder suction device 484 includes a hose 556, a joint member 522, and a hose 52.
4, connected to a vacuum source 532 via a solvent processor 526 and a hose 528, and the vacuum is supplied into the main body 492.

In this embodiment, when cleaning the screen 80, the ultrasonic cleaner 482 and the solder suction device 48 are used.
4 are moved in the X-axis direction and the Y-axis direction in a state where they are separated from each other, and the front ends are moved to a position on the screen 80 to be cleaned. After the movement, the tips are brought close to each other, sandwiching the screen 80 from both sides, the upper end surface of the horn of the ultrasonic vibration head 506 comes into contact with the back surface of the screen 80, and the contact member 550 contacts the surface of the screen 80. The contact and the sealing member 53
6 and the screen 80 and between the contact member 550 and the screen 80 are formed with gaps 544 and 554, respectively.

Then, the ultrasonic cleaning device 482 and the solder suction device 484 are moved in the X-axis direction and the Y-axis direction in the narrow area including the cleaning position, and the cleaning is performed. The speed of this movement is set to a size that allows the ultrasonic vibration head 506 to contact one location of the screen 80 for 3 to 4 seconds. At the time of cleaning, the alcohol-based solvent is supplied from the solvent supply source 514, and the ultrasonic vibration head 506 is vibrated. At this time, the alcohol-based solvent flows from the upper end opening of the solvent supply passage 508 to the upper end surface of the horn and the screen 80.
Of the screen 80 is filled with the solvent, and the surface of the screen 80 is covered with the solvent overflowing from the through hole 83. Therefore, the vibration of the ultrasonic vibration head 506 causes
The cream solder adhered to the inner peripheral surface of the through hole 83, the cream solder adhered to the back surface of the screen 80, and the cream solder adhered to the surface of the screen 80 are favorably dissolved or dispersed in the solvent from the screen 80. And is removed from the screen 80.

As described above, when the solvent is supplied and the ultrasonic vibration head 506 is vibrated, the ultrasonic cleaning device 4
Vacuum is provided within the body 490 and casing 504 of 82 and within the body 492 of the solder aspirator 482. In the solder suction device 484, when the contact member 550 comes into contact with the screen 80, a gap 554 is formed between the contact member 550 and the screen 80. There is a flow of air that enters. Therefore, the solvent in which the cream solder melts or disperses or fills the through-hole 83 or overflows on the surface of the screen 80 is sucked by the flow of the air and is stored in the solvent processing box 526 for processing. Is done.

In the space inside the contact member 550, the gap 55
4, the air flow is stronger and the suction force is greater, but the ultrasonic cleaner 482 and the solder suction device 484
The through-hole 83 sequentially reaches the portion where the suction force is strong with the movement of, so that the solvent including the creamy solder is reliably sucked.

Further, since the vacuum is also supplied to the main body 490 of the ultrasonic cleaner 482, the vacuum does not enter the through hole 83 but passes between the ultrasonic vibration head 506 and the screen 80 and enters the casing 504. The solvent that has flowed out is sucked and stored in the solvent processing box 526 for processing. Also in this case, a flow of air is generated from the outside of the casing 504 through a plurality of gaps 544 formed between the seal member 536 and the screen 80, and the solvent is favorably sucked on the flow of air. Is done.

As is clear from the above description, in this embodiment, the ultrasonic cleaner 482, the solder suction device 484,
The solvent supply source 514, the vacuum source 532, and the like constitute a printing agent removing device in the through-hole.

FIG. 18 shows still another embodiment of the present invention.
In this embodiment, the printing agent removing device in the through hole is connected to the ultrasonic cleaner 5.
62 and the solder suction device 564 and the like. The configuration of the ultrasonic cleaning device 562 is the same as that of the ultrasonic cleaning device 562 except that the main body 563 is inclined downward toward the base end and no vacuum is supplied into the main body 563. This is the same as the ultrasonic cleaning device 482.

The solder suction device 564 is configured to contact the screen 80 at a position outside the ultrasonic vibration head 506 and inside the casing 504. An abutment member 570 is fitted to the guide member 568 fixed to the lower surface of the distal end portion of the main body of the solder suction device 564 so as to be relatively movable in the axial direction. The horn of the vibrating head 506 is larger than the upper end surface. A plurality of protrusions 572 are formed on the contact member 570 and a gap 574 is formed between the contact member 570 and the screen 80 as in the above-described embodiment.

In this way, as in the embodiment shown in FIGS. 15 to 17, the supply of the alcohol-based solvent and the vibration of the ultrasonic vibration head 506 cause the screen 80 to move.
The creamy solder adhering to the front surface, the back surface, or the inside of the through hole 83 is satisfactorily removed, and the solvent containing the creamy solder in the through hole 83 and on the screen 80 is sucked by vacuum. Further, the contact member 570 contacts the outside of the ultrasonic vibration head 506 of the screen 80, and the vacuum is supplied into the contact member 570, but the vacuum is not supplied into the casing 504,
Since air is supplied into the casing 504 from the gap 544, the supply of the vacuum to the contact member 570 causes a flow of air from the casing 504 to the contact member 570, and the contact member 570 of the screen 80 is removed. The solvent containing the creamy solder in the through hole 83 located in the annular portion between the contacted portion and the portion contacted by the ultrasonic vibration head 506 is favorably sucked.

The solvent that has overflowed into the casing 504 from between the ultrasonic vibration head 506 and the screen 80 is collected at the base end of the main body 563 by the inclination of the main body 563, and the solvent processing unit provided there is provided. Processed by

In each of the above embodiments, the contact members 412, 5
50 and 570 are such that when they contact the screen 80 and move in the X-axis direction and the Y-axis direction, the contact surfaces do not change and sliding friction occurs, but the friction becomes rolling friction and frictional resistance is reduced. Is also good. For example, FIG. 19 and FIG.
As shown in FIG. 0, the ultrasonic cleaner 582 and the solder suction device 584 of the solder suction device 584 constituting the printing agent removing device in the through hole are connected to the screen 80 by a plurality of rollers 586.
It must be contacted.

A support member 592 is fitted to a guide member 590 fixed to the main body 588 of the solder suction device 584 so as to be relatively movable in the axial direction. The support member 592 has a square cross section as shown in FIG. 20, and a plurality of rollers 586 are rotated by a shaft 596 inside a pair of side walls 594 separated from each other in the Y-axis direction by a shaft 596 in parallel with the X-axis direction. It is mounted so as to be rotatable around and projecting slightly below the lower surface of the support member 592.

Therefore, when the ultrasonic cleaner 582 and the solder suction device 584 sandwich the screen 80, the roller 586 contacts the screen 80 in the solder suction device 584, and a gap 59 is provided between the support member 592 and the screen 80.
8 are formed. Therefore, the main body 5 of the solder suction device 584
Even if the vacuum is supplied to the inside of the support member 592, there is no possibility that the screen 80 adheres to the lower surface of the support member 592.
The flow of air flowing from outside the main body 588 to the inside of the main body through the main body 588 is secured, and the frictional resistance between the solder suction device 584 and the screen 80 is reduced, so that light movement is guaranteed.

The ultrasonic washer 48 of each of the above embodiments was used.
2,562,582, the solvent is supplied to the solvent supply passage 50.
8 is supplied between the screen 80 and the upper end surface of the horn of the ultrasonic vibration head 506, but the upper end surface of the horn 600 is provided with a solvent supply passage 602 as shown in FIG. May be provided so that the solvent is evenly supplied between the horn 600 and the screen 80.

The ultrasonic cleaners 482, 562, 58
2 can be employed in combination with the embodiments shown in FIGS. 1 to 11, 12, and 13. For example, by supplying compressed air, the cream-like solder in the through-hole 83 is melted or the dispersed solvent is blown off and sucked by vacuum, or stored in the receiving box 454. Further, the solvent may be mixed with the compressed air and supplied, and the solvent may be supplied and blown off.

Further, if the supply of the solvent is stopped and the supply of the vacuum is started several seconds after the ultrasonic vibration head and the casing are separated from the screen 80 by 1 to 2 mm after the supply of the solvent is stopped, the ultrasonic vibration can be started. The solvent containing the creamy solder in the through hole 83 at the position corresponding to the head can also be satisfactorily sucked.

The supply to the screen 80 is not limited to the alcohol-based solvent, but may be another solvent. In addition to the solvent, a cleaning liquid or the like may be used.

Further, the solvent supply passage is circular in each of the above embodiments, but may be changed to another shape such as a slit shape.

[0093]

Further, in the above embodiment, the creamy solder is collected when the screen is replaced. However, even when printing is stopped for a long time, the creamy solder is collected and returned to the solder container. Therefore, the creamy solder is not left in the air for a long time, so that the creamy solder is not wasted and the yield can be improved.

In each of the above embodiments, when the first squeegee member 154 and the scooping member 244 are brought close to each other at the time of collecting the creamy solder, a gap is left at the tip thereof. It may be moved until it touches or slightly intersects to scoop the creamy solder.

Further, in the embodiment shown in FIGS. 1 to 11, the two squeegee members 154 and 190 are used for collecting and returning the creamy solder, respectively. And return. The squeegee member and the scooping member can move relative to each other in the X-axis direction, so that the squeegee member is located in front of the direction of rotation of the scooping member at the time of recovery, and the squeegee member contacts the scooping surface at the time of return. To do so. In this way, the creamy solder can be collected and returned even in a screen printing machine having only one squeegee member.

Further, in the embodiment shown in FIGS. 1 to 11, the cream solder is collected and returned by moving the scooping member 244 with respect to the squeegee members 154 and 190. However, the collection and return may be performed by moving the squeegee members 154 and 190 or by moving both.

In the above embodiment, the screen 80
Although the upper creamy solder was sandwiched from the left and right sides by the first squeegee 112 and the scooping member 244, it was skimmed. However, even if only one scooping member was used, it could be skimmed. Good. In this case, for example, in the embodiment shown in FIGS.
Only the scooping member 244 is lowered and rotated to scoop up the creamy solder.
At this time, the scooping member 244 is rotated at a speed equal to or higher than a predetermined speed, and scooped up using the inertia of the creamy solder.
In this case, the number of members used for scooping can be reduced, and the collecting device can be configured simply and inexpensively.

Further, in each of the above embodiments, the solder collecting device 20 is provided together with the squeegee device 18. However, the solder collecting device 20 may be provided separately from the squeegee device 18. When the solder is collected, the squeegee device 18 is moved on the screen 80 to collect the solder, so that the squeegee device 18 can be lightened and its moving speed can be increased to improve the printing speed.

In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view (partial cross section) showing a screen cleaning device according to an embodiment of the present invention.

FIG. 2 is a plan view of the screen cleaning device.

FIG. 3 is a front view of the screen printing machine.

FIG. 4 is a side view of the screen printing machine.

FIG. 5 is a plan view of the screen printing machine.

FIG. 6 is a front view showing the squeegee device.

FIG. 7 is an enlarged front view (partial cross section) showing a main part of the squeegee device.

FIG. 8 is a side view (partial cross section) showing a solder recovery device and a squeegee device of a screen printing machine provided with the screen cleaning device.

FIG. 9 is a front view showing a device for switching a lifting speed of a scooping member in the solder collecting device.

FIG. 10 is a front sectional view showing a part of a screen of the screen printing machine.

FIG. 11 is a diagram illustrating a control device that controls the screen printing machine, illustrating a portion that is deeply relevant to the present invention.

FIG. 12 is a front sectional view showing a main part of a screen cleaning device according to another embodiment of the present invention.

FIG. 13 is a front sectional view showing a main part of a screen cleaning device according to still another embodiment of the present invention.

FIG. 14 is a front sectional view showing a main part of a screen cleaning device according to still another embodiment of the present invention.

FIG. 15 is a front view (partial cross section) showing a screen cleaning device according to still another embodiment of the present invention.

FIG. 16 is a front sectional view showing a main part of the screen cleaning device shown in FIG. 15;

FIG. 17 is a front view showing a contact member provided in a solder suction device of the screen cleaning device shown in FIG.

FIG. 18 is a front sectional view showing a main part of a screen cleaning device according to still another embodiment of the present invention.

FIG. 19 is a front sectional view showing a main part of a screen cleaning device according to still another embodiment of the present invention.

20 is a plan sectional view of a support member provided in the solder suction device of the screen cleaning device shown in FIG.

FIG. 21 is a plan view schematically showing another embodiment of the horn of the ultrasonic vibration head.

[Explanation of symbols]

 10 Printed Circuit Board 18 Squeegee Device 26 Screen Cleaning Device 38 Substrate Support 78 Screen Support 80 Screen 83 Through Hole 112 First Squeegee 188 Second Squeegee 316 Air Injector 318 Solder Suction Device 360 Air Injection Nozzle 370 Compressed Air Supply Source 398 Vacuum Source 420 Control device 430 Air supply device 431 Solder suction device 438 Compressed air supply source 446 Vacuum source 452 Solder collector 458 Air injection nozzle 470 Solder suction device 478 Vacuum source 480 Screen cleaning device 482 Ultrasonic cleaner 484 Solder suction device 514 Solvent Supply source 532 Vacuum source 560 Screen cleaning device 562 Ultrasonic cleaner 564 Solder suction device 580 Screen cleaning device 582 Ultrasonic cleaner 584 Solder suction device

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuo Kakutani 19, Chausan, Yamamachi, Chiryu-shi, Aichi Fuji Machine Manufacturing Co., Ltd. (56) References JP-A-1-255540 (JP, A) JP-A 1955-2041 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 35/00

Claims (9)

(57) [Claims] 1. It has a large number of through-holes, each of which is open on both front and back sides, and is superimposed on a printing plate at the time of screen printing.
An apparatus for cleaning a screen that allows a squeegee of a squeegee device to move thereon to allow a printing agent to be printed at a predetermined position on a printing target plate through the through-hole, wherein A printing agent removing device in a through hole that contacts the portion and removes the printing agent inside the one that is present in the part of the plurality of through holes; and a printing agent removing device in the through hole that is parallel to the screen and X-axis parallel to X-axis and Y-axis orthogonal to each other
Is moved in the direction and the Y-axis direction, whereby the screen cleaning apparatus which comprises an XY moving device for moving to an arbitrary position on the XY coordinate plane more defined in their X and Y axes. 2. The printing agent removing apparatus according to claim 1, wherein the printing agent removing device in the through hole includes a printing agent suction device that sucks and removes the printing agent in the through hole present in a part of the screen by vacuum. The screen cleaning device according to claim 1, which performs the cleaning. 3. The printing agent suction device has a longitudinal shape,
A cylindrical shape that comes into contact with the screen at the open end at the free end
Abutment is provided while the base end is parallel to the screen
Attached to a movable member so that it can rotate around a
The movable member is moved to the X axis by the XY moving device.
It can be moved in two directions parallel to the Y axis, respectively.
With this, the abutment portion is provided on an arbitrary portion of the screen.
The printing agent suction device is moved to the opposing position,
Being rotated by a rotation device about a rotation axis
The contact part moves closer to and away from the screen
3. The screen according to claim 2, wherein
Cleaning device. 4. The apparatus according to claim 4, wherein the printing agent removing device in the through-hole is provided with the mark.
The screen is sandwiched from both upper and lower sides in cooperation with the brush suction device.
An XY moving device,
The ejector and the printing material suction device are interchanged with the screen between them.
To the arbitrary position on the XY coordinate plane
4. The method according to claim 2, wherein
A screen cleaning device according to claim 1. 5. The air injection device according to claim 1, wherein the air injection device includes the air injection nozzle.
And the joint with the abutment
A cylindrical casing sandwiching the lean from both sides, The case
And a suction device for sucking air in the ring.
The screen cleaning device according to claim 4, wherein 6. The printing agent removing device in the through-hole includes a solvent supply passage sandwiching the screen from both upper and lower sides in cooperation with the printing agent suction device, and the XY moving device includes the solvent supply passage and the printing agent. of claim 2, characterized in that a suction device in a state of being opposed to each other in between the screen is to move to an arbitrary position of the XY coordinate plane
The screen cleaning device according to any one of the chairs 5 . 7. The printing agent removing device in the through hole, wherein
Provided close to the agent supply passage and contacts the screen
Ultrasonic vibration head that transmits ultrasonic vibration to the contact part
The screen according to claim 6, further comprising:
Cleaning device. 8. The screen is brought close to the printing plate.
And the raised position separated from the printing plate.
Including a lifting device for lifting and lowering between the printing agent in the through hole
The removal device has been raised to the raised position by the lifting device
A contractor characterized by cleaning the screen
A screen cleaning device according to any one of claims 1 to 7.
Place. 9. The lifting device, A screen that positions the screen and supports it almost horizontally
A lean positioning support device; The main body of the screen printing machine and the book of the screen printing machine
Two nearly horizontal, separated from each other in a substantially horizontal direction by the body
A pair of levers that are rotatably supported around a
And the two ends of the pair of levers at the free ends.
Rotatably connected around a rotation axis parallel to the rotation axis of the book.
And the main body of the screen positioning support device
A parallelogram link device configured The screen positioning support with the rotation of the lever
Raising and lowering the device between the lowered position and the raised position
9. The apparatus according to claim 8, further comprising a lifting drive.
Screen cleaning equipment.