JP2777157B2 - Printed circuit board screen printing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine for printing an adhesive or creamy solder on a predetermined portion of a printed circuit board, and more particularly, to an improvement in a substrate holding device for holding a printed circuit board. It is about.

2. Description of the Related Art Electronic circuits are widely formed by attaching chip-like circuit components to a printed circuit board on which a wiring pattern is formed. For this purpose, an adhesive is applied in a spot shape to a predetermined portion on a printed circuit board, and the lead wire of the circuit component is soldered to the wiring pattern while the circuit component is temporarily fixed to the printed circuit board by the adhesive. However, a screen printing machine is used as one device for applying the adhesive. Also, creamy solder is applied to the wiring pattern in advance, and the lead wire of the circuit component is soldered to the wiring pattern with the creamy solder. In this case, too, a screen printing machine is used to apply the creamy solder. Is used.

This screen printing machine comprises: (a) a substrate holding device for holding a printed circuit board; and (b) a screen holding device disposed above the substrate holding device for holding a screen.
(C) A squeegee movably disposed along the screen is provided above the screen holding device, and an adhesive, creamy solder, or the like is printed on a printed circuit board.

During printing, a load is applied to the printed circuit board by the squeegee, so that the board holding device is large enough to support the entire surface of the printed circuit board regardless of its size so that the load does not cause the printed circuit board to bend. It is necessary to provide a support device with a support surface. At the same time, it is necessary to position and fix the printed circuit board on the support surface, but since the screen is arranged above the support surface in printing, the fixing device must not interfere with the screen. is there. Therefore, the edge of the printed circuit board is pressed against the supporting surface with a thin pressing claw and fixed. In addition, a plurality of support pins having air suction holes are erected on a support device, and these support pins are connected to a vacuum device to attract and fix a printed circuit board onto the pins by negative pressure. .

Problems to be Solved by the Invention In a mechanical fixing device that presses the edge of a printed circuit board against a supporting surface of a supporting device by a thin pressing claw, a device for driving the pressing claw is provided outside the peripheral edge of the supporting surface. This is necessary, and when the size of the printed circuit board is small, a long holding claw must be used. However, long presser pawls need to be thick to provide sufficient bending stiffness, cannot be placed in the narrow space between the support surface and the screen, and hold various printed circuit boards of different sizes. If necessary, conventional mechanical fastening devices cannot be employed.

Further, in a fixing device using negative pressure, the above problem can be avoided because there is no portion protruding above the support surface.However, a large number of through holes are usually formed in a printed circuit board. Since the position of the through-hole changes according to the circuit pattern formed on the printed circuit board, the position of the support pins must be replaced with a different supporting device every time the printed circuit board is different. I can't get it.

The present invention has been made by noticing that it is also possible to mechanically fix the printed circuit board on the support surface without causing the above-described problems depending on the device. It is an object of the present invention to provide a printed circuit board screen printing machine provided with a substrate holding device capable of mechanically fixing printed boards of various sizes on a supporting device and not having to replace the supporting device every time the printed circuit board changes.

Means for Solving the Problems And the gist of the present invention is that the (a) substrate holding device,
(B) In a printed circuit board screen printing machine provided with a screen holding device and (c) a squeegee, a plurality of bar-shaped members are arranged in parallel with each other, and one adjacent to every other bar-shaped member is used as the substrate holding device. A support device comprising two support members integrally connected, the width of a support surface formed by a set of upper surfaces of the rod members being changed by a relative movement of the two support members in the longitudinal direction of the rod members. A pair of fixing members that engage with both edges of a plurality of sizes of printed circuit boards selectively supported by the supporting device and fix each of the printed circuit boards on a supporting surface, wherein at least the printed circuit boards are fixed. A fixing member whose projection amount upward from the upper surface of the plurality of rod-shaped members does not prevent the screen from adhering to a printed circuit board; When at least one of the members moves in the longitudinal direction of the plurality of rod-shaped members, they move together, and at least one of the pair of fixing members is relatively movable in a direction approaching or separating from the edge of the printed circuit board. Another object of the present invention is to include a moving member to be held, and a fixing driving device provided between the moving member and the fixed member held by the moving member to move the fixed member relatively to the moving member.

In a preferred aspect of the present invention, one of the pair of fixing members is a divided fixing member divided into a plurality of parts in a direction parallel to an edge of the printed circuit board, and each of the divided fixing members is a spring. As a result, the movable member is biased in a direction approaching the edge of the printed circuit board, and the movement limit by the biasing force is defined by the stopper.

In another aspect, a suction hole is formed on an upper surface of at least a part of the plurality of rod-shaped members, and the suction hole is connected to a vacuum device.

In the printed circuit board screen printing machine according to the present invention, the width of the support surface of the support device is increased by the relative movement of the two support members formed by integrally combining a plurality of mutually parallel rod-shaped members. Since it can be changed according to the size of the printed circuit board, each printed circuit board is supported by a plurality of rod-shaped members that are in close contact with the entire back surface of the printed circuit board. Moreover, even in the state where the support surface is the widest, at least the tip portions of the rod members of the two support members are engaged with each other, so that in the engaged portion, the support surface corresponds to the back surface of the printed circuit board, The rod-shaped member can be supported without any discontinuity in the width direction. Further, at least in a state where the fixing member fixes the printed circuit board, the printed circuit board does not protrude upward or only slightly protrudes from the upper surface of the printed circuit board, and the printed circuit board is supported on the supporting surface without hindering the close contact of the screen with the printed circuit board. Fix on top. Furthermore, since the fixing member is relatively movably held by the moving member that moves together with the plurality of rod-shaped members, when the width of the support surface is changed, the distance between the fixing members can be changed at the same time.

Further, in a mode in which one of the pair of fixing members is a split fixing member, when the printed board is fixed, each split member is pressed against the edge of the printed board by the urging force of the spring.

Further, in a mode in which a suction hole is formed on the upper surface of at least a part of the plurality of rod-shaped members and the suction hole is connected to the vacuum device, not only the printed board is supported by the rod-shaped member but also the suction hole. Due to the generated negative pressure, it is adsorbed on the upper surface of the rod-shaped member.

Effect of the Invention In the printed circuit board screen printing machine according to the present invention, since the width of the supporting surface of the supporting device can be changed according to the size of the printed circuit board, it is necessary to replace the supporting device regardless of the change in the size of the printed circuit board. Absent. Therefore, there is no need to manufacture a supporting device according to the size of the printed circuit board, and it is not necessary to replace the fixing member, and it is possible to mechanically fix printed circuit boards of various sizes. A simple printed circuit board screen printing machine is obtained. Furthermore, when the width of the support surface is changed, the distance between the fixing members can be changed at the same time, so that in addition to the mode in which the printed board is sandwiched and fixed from a direction parallel to the board surface, the edge of the printed board is fixed to the support surface. It is also possible to adopt a mode in which the fixing member is pressed down, and the effect of increasing the degree of freedom when designing the fixing member is obtained. Moreover, the fixing member can be made thicker in the case where it is sandwiched and fixed, and thinner in the case where it is pressed and fixed from above, but it is necessary to make it thinner. Also in this case, the rigidity of the fixing member can be increased.

Further, in an aspect in which one of the pair of fixing members is a divided fixing member, each divided member is pressed against the edge of the printed board by the biasing force of the spring, so that both edges of the printed board are not exactly parallel. In addition, even when a small protrusion or a concave portion is present at the edge, all the divided fixing members always come into contact with the edge, and the printed circuit board can be reliably fixed.

Furthermore, in a mode in which a suction hole is formed on the upper surface of the rod-shaped member, the printed board is adsorbed to the rod-shaped member,
Even a warped printed board is flattened and supported, and the effect of improving the quality of screen printing is obtained.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a printed circuit board screen printing machine according to an embodiment of the present invention.
2, a position detecting device 4 for a screen and a printed circuit board and a screen accommodating device 6 are provided.

The screen printing apparatus 2 includes a board conveyor 8 and applies an adhesive to a predetermined portion on the printed board 10 conveyed by the board conveyor 8. In addition, not only the adhesive but also a coating material such as creamy solder can be used. The board conveyer 8 conveys the printed circuit board 10 in the vertical direction in FIG. 1, and the conveying direction is the X-axis direction, and the direction orthogonal to the X-axis direction in the horizontal plane is the Y-axis direction. The board conveyor 8 will be described later.

The position detecting means 4 reads the position of the screen 12 after the setup change and the position of the printed circuit board 10 after the conveyance, and the position of the screen 12 is corrected based on the read result. The position detecting device 4 is provided with the TV cameras 20 and 2
The slide 22 is supported by a guide 26 so as to be movable in the X-axis direction, and the slide 22 is supported by the slide 22 so as to be movable in the Y-axis direction. A television camera 20 is attached to the front end of the slide 24 on the screen printing device 2 side.
Is moved so that the television camera 20 can read the position of the reference mark provided on the screen 12 or the printed circuit board 10.

The screen housing device 6 includes a printed circuit board 10 to be printed.
In this printed circuit board screen printing machine, the position detection device 4 is configured to be able to perform the replacement work as well. Japanese Patent Application No. 63-1508
No. 86 is described in detail and is not essential for understanding the present invention.

As shown in FIGS. 2 and 3, the screen printing device 2 includes a substrate holding device in addition to the substrate conveyor 8.
28, a screen holding device 30 and a squeegee device 32.

The substrate holding device 28 is a supporting device for supporting the printed circuit board 10.
34, a lifting device 35 for raising and lowering the supporting device 34, and a fixing device 36 for fixing the printed circuit board 10 supported by the raised supporting device 34. The screen holding device 30 is connected to the screen 12 by the screen support 38.
And a screen frame 40 fixed to the periphery thereof, and is positioned and held. The squeegee device 32 raises and lowers the stage 42 between a lower position and an upper position in contact with the screen 12, and moves the screen 12 in a linear direction along the screen 12. The board conveyor 8 shares the fixed side plate 44 and the movable side plate 46 for guiding the printed circuit board 10 with the board conveyors 48 and 49 (see FIG. 5).
The printed board 10 received from the board conveyor 48 is carried into the space between the board holding device 28 and the screen 12, and is delivered to the board conveyor 49 after printing.

Among the above devices, the substrate holding device 28, the screen holding device 30, and the squeegee device 32 are installed on a movable table 52 movable with respect to the bed 50. The movable table 52 is made of a casting having a concave portion 54, and is movable in the Y-axis direction, that is, in the second direction, by two guide rods 56 arranged in parallel on the bed 50.
It is supported so as to be movable in the left-right direction in the figure and in the direction perpendicular to the paper surface in FIG. The screen holding device 30 and the squeegee device 32 are always in a state of covering the substrate holding device 28 and the substrate conveyer 8 above, but can open their upper space by rotating. A frame 58 supporting the screen holding device 30 and the squeegee device 32 has a pair of columns 60
It is rotatably mounted by means of an actuator (not shown) connected to the connecting portion 64. A coupling device 65 for coupling and separating the frame 58, the squeegee device 32, and the screen support 38 is provided at a portion of the frame 58 far from the shaft 62. When reading the position, the frames 58,
The screen holding device 30 and the squeegee position 32 are rotated integrally, and when reading the position of the screen 12, the screen holding device 30 is separated at the coupling device 65,
Only the frame 58 and the squeegee device 32 are rotated. The end of the screen support 38 remote from the shaft 62 is supported by a support 68 via an adjusting screw 66, thereby allowing the screen holding device 30 and the squeegee device 32 to move relative to the substrate holding device 28 and the substrate conveyor 8. Height adjustment is possible.

Hereinafter, the configuration of each unit of the screen printing apparatus 2 will be sequentially described in detail. However, the support device 34, the elevating device 35, and the fixing device 36 of the substrate holding device 28 will be described in separate sections for convenience of explanation.

(Substrate Holding Apparatus-Elevating Apparatus) The lifting apparatus 35 of the substrate holding apparatus 28 includes a support table 72 placed on the movable table 52 via a height adjusting apparatus 70, as is apparent from FIG. I have. That is, the concave portion of the movable base 52
A plurality of guide blocks 74 are slidably supported in the longitudinal direction by a plurality of guide blocks 74, and two cam bars 76 having a slope inclined in the longitudinal direction are provided on the upper surface of the support block 72. There are provided four cam followers 77 each having a slope corresponding to the above-mentioned slope, two for each cam rod 76, and the height of the support base 72 as the cam rod 76 moves in the longitudinal direction. Is to be adjusted. The two cam bars 76 are connected by a connecting bar 78, and a feed screw 80 parallel to the cam bar 76 is screwed to the connecting bar 78, and the handle is engaged with the feed screw 80 to rotate. Thus, the two cam rods 76 can be moved integrally.
A set screw 82 for preventing rotation of the feed screw 80 is screwed to the movable table 52. After the support table 72 has been adjusted to a predetermined height, the set screw 82 is tightened.
The height of 72 can be kept constant. As shown in FIG. 5, two guide cylinders 84 are fixed to the support base 72 in a posture extending in the vertical direction. An engaging member 86 is engaged with each guide tube 84 so as to be immovable downward with respect to each guide tube 84, and a spring 88 is disposed between the engaging member 86 and the movable base 52. By pulling the support base 72 toward the movable base 52, the guide block 74, the cam bar 76, and the cam follower 77 are kept in close contact with each other, and the support base 72 is accurately maintained at a predetermined height. I have.

Loads 90 are slidably fitted to the respective guide cylinders 84, and the upper ends of the rods 90 are provided with the support base 72.
A lifting plate 92 is fixed in parallel with the plate surface of. This lifting plate
A support 92 supports the support device 34, and is fixed to a piston rod 96 of a cylinder 94 attached to the support base 72. The lifting plate 92 will be described later.

The rising end position of the lifting plate 92 is defined by a rising end position adjusting device 98. FIGS. 4 and 5
As shown in the figure, two cam bars 100 having a slope inclined in the longitudinal direction on the lower surface are provided. The two cam bars 100
A concave guide block 102 fixed to the lower surface of the movable base 52
And a stepped cylindrical member 104 fixed to its guide block 102
, And are slidably supported along the guide block 102 in the longitudinal direction, respectively. These cam bars 100 are connected by a connecting bar 106, and a feed screw 108 parallel to the cam bar 100 is screwed into the connecting bar 106, and a fixed adjustment knob 110 is fixed to the tip of the feed screw 108. By rotating, the two cam bars 100 can be moved integrally. The cylindrical member 104 has a notch that allows the cam bar 100 to be inserted as described above, and has a through hole that penetrates in the axial direction, and the shaft member 112 is slidably fitted in the through hole. . One end of the shaft member 112 is a cam follower portion 114 having a slope corresponding to the slope of the cam rod 100.
The cam follower section 114 and the cam bar 100 are always kept in close contact with each other by a spring 116 disposed between the cylinder member 104 and the cylindrical member 104. The other end of each shaft member 112 can project from the opening of the cylindrical member 104, and a stopper 120 is provided on the upper surface of a connecting member 118 that connects the rods 90 to each other, facing the other end of the shaft member 112. Each is attached. Therefore, the rising end position of the lifting plate 92 is
The stopper 120 is defined by contact with the shaft member 112. At this time, the rotation of the adjustment knob 110 causes the cam bar 100 to move forward, and the cam of the cam bar 100 causes the shaft member 112 to bias the spring 116. When the adjustment knob 110 is turned downward in the opposite direction, the amount of protrusion of the shaft member 112 increases and the rising end position of the lifting plate 92 becomes lower than before the adjustment. The protrusion amount of 112 becomes small, and the rising end position becomes high. The feed screw 108
The rotation of the feed screw 108 is not limited to manual operation, and the feed screw 108 is connected to the output shaft of the step motor, and the rotation of the feed screw 108 is read by an encoder. It is also possible to automatically set the desired rising end position.

(Screen Holding Device) The screen support base 38 of the screen holding device 30 is constituted by a part of the rotatable frame 58, and supports the screen 12 and the screen frame 40 as shown in FIG. ing. The screen support base 38 is a rectangular frame body. Of the frame parts parallel to the X-axis direction (vertical direction in the figure), two Y-axis direction position setting are performed on the frame part opposite to the position detection device 4. While the device 122 is provided, a Y-axis direction pressing device 124 is provided in the frame portion on the side of the position detection device 4 in correspondence with each Y-axis direction position setting device 122. Further, among the frame portions parallel to the Y-axis direction of the screen support base 38, one frame portion is provided with an X-axis direction position setting device 126, and the other frame portion is provided with an X-axis direction pressing device 128. ing.

The Y-axis direction position setting device 122 sets the position of the screen 12 in the Y-axis direction, and includes a positioning lever 130 rotatably supported. The positioning lever 130 is connected to the output shaft of the step motor 132, is rotated by an appropriate amount by the rotation of the step motor 132, and accurately defines the position of the screen frame 40 in the Y-axis direction.

The Y-axis direction pressing device 124 has a screen 134
The lever 136 is rotatably supported by the lever.
One end of lever 136 is the piston rod of air cylinder 138
When the piston rod 140 advances, the lever 136 engages with a side surface of the screen frame 40 parallel to the X-axis direction to press the screen frame 40 against the Y-axis direction position setting device 122. Thus, the screen frame 40 is positioned in the Y-axis direction.

The X-axis direction position setting device 126 is the same as the Y-axis direction position setting device 122, and includes a positioning lever 139, a step motor 141 and the like.

The X-axis direction pressing device 128 is constituted by an air cylinder 142 provided in the X-axis direction, the piston rod 144 of which is in contact with the screen frame 40, and presses the screen frame 40 against the X-axis direction position setting device 126, Screen 12
Are positioned in the X-axis direction.

Further, above the four corners of the screen frame 40, respective fixed cylinders 144 are provided. These fixed cylinders 144 are arranged in the up-down direction, are at the rising end position when the screen 12 is positioned and are separated from the screen frame 40, but are lowered after the positioning and the screen frame 40 is moved to the screen support base 38. Fix it.

The step motors 132 and 140, the air cylinders 138 and 142, and the fixed cylinder 144 are controlled by a control device (not shown) based on the reading result of the television camera 20, and are formed on the screen 12 after the control. A large number of small holes will be precisely matched with the site on the printed circuit board 10 where the adhesive is to be applied. In this embodiment, the screen 12 is made of a stainless steel thin plate.However, other screens such as those having a synthetic resin coating on both surfaces except for a transparent portion at a predetermined portion of the tetron mesh can be adopted. is there.

(Squeegee Device) Returning to FIGS. 2 and 3, the squeegee device 32 includes two guide rods 146 disposed horizontally and parallel to each other on the rotatable frame 58, and the squeegee device 32 is mounted on the guide rod 146. And a slide 148 that slides the slide. The slide 148 is provided with two pairs of guide cylinders 150 that are paired at a distance in a direction perpendicular to the moving direction. Guide tube 1 for each pair
50 is two rods 152 fitted slidably in the vertical direction.
A mounting member 154 is fixed to a lower end of the squeegee, and the squeegee 42 is detachably mounted on the mounting member 154. Each mounting member 154 is raised and lowered by a lifting cylinder 156 shown in FIG.
Is moved to a lower position where it comes into contact with the upper surface and an upper position which is away from the lower position. A nut 158 is fixed to the slide 148, and a feed screw 160 is attached to the frame 58 so as to be rotatable and immovable in the axial direction. By being rotated, the squeegee 42 is linearly reciprocated along the screen 12.

(Substrate Holding Device-Supporting Device) As shown in FIG. 2, the supporting device 34 is disposed between the support base 72 and the screen support base 38, and includes a plurality of rod-shaped members having a hollow rectangular cross-sectional shape. It has 164. As is clear from FIG. 7, the rod-shaped members 164 are arranged in parallel in a state where adjacent members are in contact with each other, and the upper surfaces of these rod-shaped members 164 function as a support surface for supporting the printed circuit board 10. I have. Every other one of the bar-shaped members 164 is divided into a group on the fixed side plate 44 side and a group on the movable side plate 46 side, and a support pin 166 (see FIG. 4) at one end on the side farther from each other. ), And at the other end on the near side is supported by a common bar support plate 168 extending perpendicular to the longitudinal direction of the bar-shaped member 164. The bar support plate 168 has the same height as the support pins 166 and a length capable of supporting all the bar members 164, and is fixed to the lifting plate 92.

The support pins 166 are formed in a columnar shape as typically shown in FIG. 8 on the side of the fixed side plate 44, and each end is fixed to an end of the rod-shaped member 164a by a bolt 170, while near the other end. The two sides are chamfered to form an engagement portion 172 having a T-shaped cross section.
(See FIG. 5). Engagement part 1 of each support pin 166
Corresponding to 72, a T-groove 174 is formed in the lifting plate 92 in parallel with the longitudinal direction of the bar-shaped member 164a, and the engaging portion 172 is slidably engaged. The support pins 166 that support the bar-shaped members 164a are integrally connected by a pin support member 176 fixed to the inner wall of the fixed side plate 44. Pin support member 176
Has a longitudinal shape extending parallel to the fixed side plate 44, and has a vertical through hole 178 corresponding to each support pin 166, and the support pin 166 is slidably fitted in each through hole 178. I have. Accordingly, only the vertical movement of the bar-shaped member 164a relative to the fixed side plate 44 is allowed. Movable side plate 46
As shown in FIG. 4, a similar pin support member 180
Are fixed, and the support pins 166 are slidably fitted and integrally connected, and only the vertical movement of the bar-shaped member 164b relative to the movable side plate 46 is allowed. That is, the pin support member 180 functions as a moving member that moves together with the plurality of rod-shaped members 164b.

As shown in FIG. 8, five to ten suction holes 181 (for the eighth rod member 164) are provided on the upper surface of each rod member 164, as shown in FIG.
(Only one is shown in the figure) and is always closed by a rubber stopper not shown. A vacuum tube 182 is connected via a connector 184 to an end of each rod 164 opposite to the side supported by the support pin 166 so that the inside of the rod 164 communicates with a vacuum device (not shown). Has been. In FIGS. 3, 5, and 7, connectors are shown for simplicity.
184 is omitted.

(Substrate Holding Apparatus-Fixing Apparatus) As shown in FIG.
A protrusion 186 is formed on the extension of
A notch 188 is formed on the extension of b to form a comb-like shape, and a portion corresponding to an extension of the lifting plate 92 is cut out in a rectangular shape.
It is fixed to. A pair of mounting members 192 (see FIG. 3) are mounted on the outer side surface of the fixed side plate 44 at a distance in the longitudinal direction. As shown in FIGS. 4 and 5, the mounting member 192 has a support rod 196 having a convex portion 194 on the upper surface.
Is extended in the X-axis direction.
A plurality of substrate fixing plates 200 having recesses 198 engageable with the 94 are provided at regular intervals. Substrate fixing plate 200 is horizontal section 202
And an L-shape having a vertical portion 204 and having the same width as the protrusion 186 of the fixed side plate 44, and the protrusion 186 and the substrate fixing plate
The side surface of the vertical portion 204 of the 200 is fixed so as to be aligned. As a result, the rod-shaped member 164 b is
In addition, it is allowed to protrude outward between the board fixing plates 200.

Like the fixed side plate 44, the movable side plate 46 has a comb-like shape having a protruding portion 206 and a notch portion 208. This movable side plate 4
As shown in FIG. 7, a pair of guides 210 are provided below the rods 16 at a distance in the longitudinal direction of the movable side plate 46, respectively.
It is arranged parallel to 4b. As is clear from FIG. 4, each guide member 210 is fixed on the support base 72, and includes a guide rod 212 extending from the outside to the inside of the movable side plate 46, and a sliding member 214 is attached to each of the guide rods 212. It is slidably fitted. Both ends of a support bracket 216 extending in parallel with the support bar 196 on the fixed side plate 44 side are fixed to the two sliding members 214, respectively. As shown in FIG. 9, the support bracket 216 has a horizontal portion 218 having substantially the same size and shape as the horizontal portion 202 of the substrate fixing plate 200.
A plurality of substrate fixing plates 222 having a vertical portion 220 longer than the vertical portion 204 are arranged at regular intervals, and the vertical portion 220 is fixed in a state facing the protrusion 206 of the movable side plate 46. I have. Thus, interference between the rod-shaped member 164a, the movable side plate 46, and the substrate fixing plate 222 is avoided.

The horizontal portion 218 of the substrate fixing plate 222 extends above the movable side plate 46 in parallel with each bar-shaped member 164b (see FIG. 7), and an engaging claw 224 is fixed to a distal end portion thereof with a bolt 226. Engaging claw
The top end of the upper portion 224 is an acute angle substrate engaging portion 228.
An engagement claw 224 is similarly provided on the horizontal portion 202 of the substrate fixing plate 200, and the printed circuit board 10 is sandwiched in a direction parallel to the plate surface thereof in cooperation with the engagement claw 224 of the substrate fixing plate 222. Are getting to get. The board fixing plates 200 and 222, together with the engagement claws 224 fixed to them, constitute a fixing member for fixing the printed board 10 by engaging with both side end surfaces of the printed board 10. The horizontal planes 202, 218 of the substrate fixing plates 200, 222 also have a function of supporting the middle part of the screen 12 from below.

The fixing driving device 230 is connected to the substrate fixing plate 222. As shown in FIGS. 9 and 10, the fixing driving device 230 connects the sliding member 214 and the movable side plate 46 to each other, and moves the substrate fixed plate 222 together with the movable side plate 46 when the movable side plate 46 moves. When the movable side plate 46 and the movable side plate 46 are stopped, the substrate fixing plate 222 is relatively moved with respect to the movable side plate 46, and is moved toward and away from the substrate fixed plate 200, which is stationary together with the fixed side plate 44, by a small amount.

As shown in FIG. 7, the fixing drive device 230 includes a stepped shaft 232 in which small-diameter portions at both ends are rotatably supported by support brackets 216, and one lever 234 is provided for each of the small-diameter portions.
Has been fixed. Returning to FIGS. 9 and 10, each lever 234 is connected to the mounting plate 240 of the movable side plate 46 by two joint members 238 connected by an adjustment nut 236. In addition, another lever 2 is attached to one of the two small diameter portions of the stepped shaft 232.
The air cylinder 246 is connected to the lever 242 via a joint member 244. This air cylinder 246
Is rotatably attached to a sliding member 214 supporting the support bracket 216. Accordingly, the operation of the air cylinder 246 causes the sliding member 214 to move with respect to the movable side plate 46.
9 and the substrate fixing plate 222 supported by the movable side plate 46 is moved relatively to the left and right in FIG. 9, and the movable side plate 46 is moved toward and away from the fixed side plate 44 in accordance with a change in the size of the printed circuit board 10. Accordingly, the substrate fixing plate 222
Are also moved toward and away from the substrate fixing plate 200.

(Board Conveyor) As is clear from FIG. 4, the board conveyor 8 includes a frame 274 parallel to the fixed side plate 44 and the movable side plate 46 in addition to the fixed side plate 44 and the movable side plate 46. A plurality of side plate feed screws 276 are hung over the rotatable and immovable axially. These side plate feed screws 27 are screwed to the movable side plate 46 at a distance in the flow direction thereof and with a side plate nut 278 fixed at a right angle to the longitudinal direction. All side plate feed screws 276 are sprocket 2
80 and a chain 282 shown in FIG. 3 so that they can be rotated by the same amount in the same direction. Therefore, by rotating one side plate feed screw 276, the movable side plate 46 is moved closer to or away from the fixed side plate 44 while maintaining a posture parallel to the fixed plate side plate 44, and the movable side plate 46 is moved between the two side plates 44, 46. Is easily changed.
At this time, since the movable side plate 46 and the sliding member 214 are connected by the fixing driving device 230 as described above, the substrate fixing plate 222 approaches or separates from the substrate fixing plate 200 as the movable side plate 46 moves. Let me do.

As shown in FIG. 8, shafts 284 are rotatably attached to the protrusions 186 of the fixed side plate 44, respectively. Each axis 2
A roller 286 with a flange is attached to one end of 84 with the flange facing the fixed side plate 44, while a pulley 288 is attached to the other end. Below the shaft 284, a shaft 290 supported by the fixed side plate 44 so as not to rotate relatively.
And a sprocket 292 is rotatably supported in correspondence with the pulley 288, and a belt 294 is wound around the pulley 288 and the sprocket 292, respectively.
The endless chain 296 is attached to the teeth of each sprocket 292.
Is wound around, and the chain 296 is driven by a motor (not shown).
2. The roller 286 is rotated by the rotation of the belt 294 and the pulley 288. Further, a chain retainer 298 extending in the X-axis direction in proximity to the teeth of each sprocket 292 is provided with a fixed side plate 44.
Are fixed via spacers 300 arranged at regular intervals in the longitudinal direction of the chain, and the chain 296 is lightly pressed to prevent the chain 296 from floating from the sprocket 292. Since the same applies to the movable side plate 46, corresponding members are denoted by the same reference numerals, and detailed description is omitted. Then, by rotating both rollers 286 in synchronization with each other, the printed circuit board 10 is carried into or out of the space between the bar-shaped member 164 and the screen support base 38.

The printed circuit board 10 carried above the bar-shaped member 164 is stopped by the stopper device 302 shown in FIG.
The stopper device 302 includes a stopper member 306 that is moved up and down by an elevating cylinder 304 attached to the support base 72 as shown in FIG. 11, and the stopper member 306 contacts the front end of the printed circuit board 10 at the ascending position. And further prevents the printed circuit board 10 from moving forward in the lowered position.

(Others) With the change in the width between the side plates 44 and 46, the movable table 52 can be moved in the same direction as the movable side plates 46 by a distance of 1/2. As described above, the movable side plate 46 includes the side plate feed screw 276, side plate nut 278, sprocket 280, and chain 2
These are moved by 82, which are further connected to the carriage feed screw 314 by sprockets 308, chains 310 and sprockets 312, as shown in FIG. The movable table feed screw 314 is supported by the bed 50 so as to be rotatable and immovable in the axial direction, and a handle 316 is fixed to one end thereof. The movable platform feed screw 314
It is screwed into a movable base nut 318 fixed to the movable base 52 in a posture parallel to the side plate nut 278. Side plate feed screw 276
And the movable stage feed screw 314 have the same pitch, but the sprockets 280, 308, 312 and the chains 282, 310
The rotation transmission mechanism consisting of
Since the speed is doubled and transmitted to the side plate feed screw 276, when the movable base feed screw 314 is rotated by the handle 316, the side plate feed screw 276 is rotated at twice the speed. When the movable side plate 46 is moved by a distance 1 as shown in FIG. 4, the movable table 52 is moved in the same direction by 1/2, and together with the movable table 52, the bar support plate 168 is moved.
Is also moved in the same direction by l / 2. At this time, the difference in the amount of movement between the movable side plate 46 and the movable base 52 is
4 is allowed by sliding on the guide rod 212.
Further, the mounting member 192 mounted on the fixed side plate 44 is supported by the support base 72 via a sliding member 320, whereby relative movement between the substrate fixing plate 200 and the support base 72 is allowed.

(Operation) Next, the operation of the printed circuit board screen printing machine will be described.

First, the width of the board conveyor 8 is adjusted to a width suitable for the printed board 10 to be printed by rotating the handle 316.
Since the rod-shaped member 164b is coupled to the movable side plate 46 via the pin support member 180 and the support pin 166, the rod-shaped member 164b slides over the rod-shaped support plate 168 with the movement of the movable side plate 46. While being actuated relatively to the rod-like member 164a, the width of the support surface formed by the upper surface of the rod-like member 164 is changed. At this time, the rod-shaped member 164b is notched 188 of the fixed side plate 44.
Since the bar-shaped member 164a faces the notch 208 of the movable side plate 46 while the bar-shaped member 164a faces the gap between the substrate fixing plate 200, the bar-shaped members 164b and 164a do not interfere with the fixed side plate 44 and the like. In this embodiment, the width of the support surface of the bar-shaped member 164 can be changed within a range of about 30 to 350 mm, and the printed board 10 having a size within the range can be supported by the bar-shaped member 164. Since the movable side plate 46 and the substrate fixing plate 222 are connected by the fixing driving device 230, the substrate fixing plate 222 is moved simultaneously with the movement of the movable side plate 46, and is brought closer to the substrate fixing plate 200. Further, since the side plate feed screw 276 and the movable base feed screw 314 are connected by the rotation transmission mechanism including the sprocket 308 and the like as described above, the movable base plate
52 is moved in the same direction by a half distance. Therefore, the substrate holding device 28, the screen holding device 30, and the squeegee device 3 installed on the movable table 52
2 also moves by the half distance, and even if the width of the board conveyor 8 is changed, the center of the board conveyor 8 coincides with the center in the width direction of the support device 34, the screen 12, and the squeegee 42. Kept in state.

When the adjustment of the width of the board conveyor 8 is completed, the squeegee 42 and the screen 12 corresponding to the new printed board 10 are mounted on the mounting member 154 and the screen support base 38, respectively. After attaching the screen 12 to the screen support 38, the frame 58 and the squeegee device 32 separated from the screen support 38 in the coupling device 65 are rotated around the axis 62, and the movement of the slides 22, 24 causes the television camera to move. Two
0 is moved over the reference mark provided on the screen 12 and the position of the screen 12 is read. screen
Two reference marks (not shown) are provided in portions deviating from the pattern portion in which the small holes 18 permitting the transmission of the adhesive are formed, and the positions of the respective reference marks are read. The reading result of the television camera 20 is supplied to the control device, and is compared with a reference position stored in the RAM of the control device in advance to calculate the displacement of the screen 12 in the X-axis direction and the Y-axis direction. Thereafter, the screen frame 40 is pressed against the screen support base 38 by the fixed cylinder 144 and is fixed at the temporary position, the TV camera 20 is returned to the original position, and the frame 58 and the squeegee device 32
Is returned to the working position.

When the printing machine is started, each roller 28 of the board conveyor 8 is
6 is rotated in the feed direction of the printed circuit board 10 by a driving device (not shown), and as shown in FIG. 2, the printed circuit board 10 is moved from the board conveyor 48 to the bar-shaped member 164 at the lower end position and the screen above it. It is carried in between 12. After the printed circuit board 10 is prevented from further advancing by the stopper device 302, the rotation of the roller 286 is stopped.

Subsequently, the frame 58, the squeegee device 3
2 is coupled to the screen holding device 30 and these are rotated integrally, and the reference mark provided on the printed circuit board 10 is read by the television camera 20 in the same manner as in the case of reading the position of the screen 12. The reading result is compared with the reference position to calculate the displacement of the printed circuit board 10 in the X-axis direction and the Y-axis direction. The television camera 20 is returned to the home position, and the squeegee device 32 and the screen holding device 30
Is rotated to the operating position again, and then the fixed cylinder 144 is rotated.
Is released. Then, the deviation of the printed circuit board 10 from the reference position and the deviation of the screen 12 are added by the control device in the X and Y axis directions, respectively. Based on the addition result, the Y axis direction position setting device 122 and the X axis direction position The position of the screen 12 is set by the setting device 126, and the screen 12 is pressed against each of the axial position setting devices 122 and 126 by the Y-axis pressing device 124 and the X-axis pressing device 128. The position of the screen 12 itself is corrected based on the positional deviation of the screen 12 and the positional deviation of the printed circuit board 10, and in this state, many small holes formed in the screen 12 remove the creamy solder on the printed circuit board 10. It exactly matches the site to be applied. After the completion of the position correction, the screen frame 40 is fixed to the screen support base 38 by the operation of the fixed cylinder 144.

Subsequently, as the lifting plate 92 is raised by the cylinder 94, the rod-shaped member 164 is moved to the support pin 166 and the rod support plate.
The printed circuit board 10 is lifted up from below by lifting it up from the transport position indicated by the dashed line in FIG. 4 to the printing position indicated by the dashed line in FIG. In this case, as the width of the printed circuit board 10 to be printed is larger, the gap between the fixed side plate 44 and the movable side plate 46 needs to be increased, and the rod-shaped member 164a
Although the gap between the rod-shaped member 164b is increased and the printed circuit board 10 is not in close contact with and supported on the entire back surface of the printed circuit board 10, it is necessary to support the printed circuit board 10 in a state of being in close contact with the entire back surface of the printed circuit board 10. Can. At the printing position, the printed circuit board 10 is in close contact with or close to the lower surface of the screen 12. Then, as shown in FIG. 9, the upper surfaces of the engagement claws 244 and the substrate fixing plates 200 and 222 are located above the support surface of the rod-shaped member 164 but below the upper surface of the printed circuit board 10, and the screen 12 and the It does not hinder close contact with the printed circuit board 10. Since the printing position changes according to the thickness of the printed circuit board 10 to be printed,
Depending on the thickness of 10, the height adjusting device 70 and the rising end position adjusting device 98 are adjusted in relation to each other. At this time, in the ascending end position adjusting device 98, two stoppers 120 are provided at positions apart from each other corresponding to each shaft member 112, so that the parallelism of the bar-shaped member 164 at the ascending end position to the screen 12 is maintained. It is.

After the printed circuit board 10 reaches the printing position, a clockwise rotational moment in FIG. 9 is applied to the levers 242 and 234 by the operation of the air cylinder 246 of the fixing driving device 230 shown in FIG. As a result, a rightward force in the figure acts on the movable side plate 46, but since the movable side plate 46 is in a fixed state when the side plate feed screw 276 is not rotating, the sliding member 214 is moved by the guide rod instead of moving the movable side plate 46. The substrate fixing plate 222 is moved to the left on the 212, so that the substrate fixing plate 222 slightly approaches the substrate fixing plate 200 side. As a result, the engagement claws 2 of each substrate fixing plate 222
24 engages the side end surface of the printed circuit board 10 to
Is pressed against the engaging claws 224 of each substrate fixing plate 200 to be fixed.

Subsequently, the squeegee 42 on the left side in FIG.
The right squeegee 42 is moved from right to left while in contact with the surface of the screen 12, and a part of the adhesive pushed on the screen 12 by the right squeegee 42
Pressed into the many small holes formed in the printed circuit board 10
Attached to the top surface of the At this time, a downward force is applied to each part of the printed circuit board 10, but the printed circuit board 10 is supported by the rod-shaped members 164 in a state of being in close contact with the entire back surface in a dispersive manner. There is no appreciable deflection. Also, the horizontal portions 20 of the substrate fixing plates 200 and 222
The screen 12 is also prevented from bending downward by being supported by the 2,218.

After the squeegee 42 passes above the printed circuit board 10, the right squeegee 42 is raised, the left squeegee 42 is lowered, and printing on the next printed circuit board 10 is performed from left to right of the left squeegee 42. It becomes a state that can be performed by moving.

When the adhesive is applied in this manner, since the center in the width direction of the support device 34 and the center in the width direction of the printing mechanism including the squeegee device 32 and the like match as described above, The centers of the screen 12 and the squeegee 42 in the width direction also match, and the thickness of the adhesive printed on the printed board 10 does not become uneven in the width direction of the printed board 10.

After the above operation, the fixing of the printed board 10 by the board fixing plates 200 and 222 is released, the rod-shaped member 164 is lowered to the original position, and the printed printed board 10 on which printing has been completed is again supported by the rollers 286. . And the stopper device 3
When the substrate conveyors 8, 49 and 48 are driven in a state where the stopper member 306 of 02 is lowered, the printed printed circuit board 10 is carried out from a position above the bar-shaped member 164, and a one-cycle printing operation is performed. Ends.

If the flatness of the printed circuit board 10 is good, it is fixed as described above, but if the flatness is poor and it is warped downward or upward, it is fixed as follows. Is done. When the printed board 10 is a warped board that is warped downwardly convex, the printed board 10 is pressed flat from above and fixed by the board fixing plates 200 and 222 by a pressing device mainly composed of a robot (not shown). . On the other hand, when the printed circuit board 10 is a warped substrate that is warped upwardly convex, even if the substrate fixing plates 200 and 222 are fixed in a state where the pressing device presses the printed circuit board 10 flat, the pressing by the pressing device alone is not sufficient. Is released, the printed circuit board 10 warps upward again. However, in the apparatus of the present embodiment, if the suction holes 181 of the bar-shaped member 164 are selectively opened in advance in consideration of the wiring pattern of the printed circuit board 10, the printed circuit board 10 pressed flat by the pressing device can be used. It is attracted to the support surface of the rod-shaped member 164, and is prevented from warping upward when the pressing is released, so that the fixing by the substrate fixing plates 200 and 222 is performed without any trouble.

It should be noted that the fixing driving device 230 in the device of the present embodiment can be changed to, for example, a fixing driving device 330 shown in FIGS. 12 and 13. A pair of guide members 331 are provided on the support base 72 at a distance in the longitudinal direction of the movable side plate 46, and sliding members 334 are slidably supported by guide rods 332 of each guide member 331. The two sliding members 334 are connected by a long connecting plate 336 fixed to the movable side plate 46, and a large number of substrate fixing rod supporting members 338 are arranged on the connecting plate 336 at regular intervals. The substrate fixing rod support member 338 is formed in an L shape, and a vertical groove is formed in the leg portion 340.
While 342 is formed, a horizontal through hole is formed in the arm part 344.
346 is formed, and the through hole 346 has one end of the
A substrate fixing rod 350 having 8 is slidably fitted. Note that, similarly to the first embodiment, the arm section 344 also has a function of supporting the screen 12. The upper end of the substrate fixing portion 348 has an acute angle, and is accommodated in a vertical groove 352 formed at the end of the arm portion 344. The other end of the substrate fixing rod 350 is the leg 3
One end of a lever 354 is rotatably connected to the other end of the lever 354. The lever 354 has a U-shape, and its middle part is a substrate fixing rod support member 338.
Is rotatably supported on a leg 340 by a shaft 356, and the other end is connected to a yoke 360 of a rod 358 with a yoke by a shaft 36.
It is rotatably connected by 1. Rod with yoke 3
Reference numeral 58 denotes a plate-like lever 364 fixed to the rotating shaft 362, which is slidably supported in the axial direction. The rotating shaft 362 is rotatably supported by a bracket 366 fixed to each sliding member 334. . Rotating axis 3
One end of 62 protrudes outward from the bracket 366, and one end of the lever 368 is fixed to the protruding end, while the other end of the lever 368 is connected to the piston rod 374 of the air cylinder 372 attached to the bracket 366. It is connected rotatably. The lever 364 has a cylindrical spring receiver 3 with a bottom.
78 is fixed on the bottom side, and the yoke-equipped rod 358 passes through both members of the lever 364 and the spring receiver 378. A spring receiver 380 is attached to the rear end of the yoke rod 358 with a nut 382,
A spring 384 is provided between the bottom of the spring receiver 378 and the spring receiver 380.

In this fixing drive device 330, the rod 358 with the yoke portion is always urged rightward in FIG. 12 by the urging force of the spring 384, but the yoke portion 360 comes into contact with the lever 364 to further increase the force. Movement is blocked. Therefore, the lever 354 and the substrate fixing rod 350 are in the state shown in the figure, and the substrate fixing portion 348 is accommodated in the groove 352. Then, when the air cylinder 372 is operated, a large number of substrate fixing rods 350 are simultaneously advanced,
The board fixing portions 348 are engaged with the side end surfaces of the printed circuit board 10. At this time, the variation in the advance limit of each board fixing rod 350 is absorbed by the spring 384. Therefore, all the board fixing parts 348 are printed board 1
Thus, the printed circuit board 10 can be satisfactorily fixed over almost the entire area in the longitudinal direction. That is, the substrate fixing rod 350 provided with the substrate fixing portion 348 is fixed to the fixing member (the substrate fixing plate 222) in the embodiment.
And the engagement claws 224) correspond to a plurality of divided fixing members divided in a direction parallel to the edge of the printed circuit board 10, and limit the movement limit of the substrate fixing rod 350 by the urging force of the spring 384. The lever 364 defined by the contact with the 360 corresponds to the stopper.

In addition, the present invention can be implemented in various modified and improved embodiments based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a plan view showing a printed circuit board screen printing machine according to one embodiment of the present invention, and FIG. 2 is a front view showing a screen printing apparatus of the screen printing machine of FIG. FIG. 3 is a side view showing the screen printing apparatus with a part cut away. FIG. 4 is a cross-sectional view of a main part of FIG. 2, and FIG. 5 is a cross-sectional view of a main part of FIG.
FIG. 6 is a plan view showing the screen frame and its periphery. FIG. 7 is a plan view showing a supporting device, a fixing device, a substrate conveyor and the like of the printing apparatus. FIG. 8 is a front view showing a part of the periphery of the fixed side plate in partial cross section, and FIG. 9 is a front sectional view showing the periphery of the movable side plate and the fixing device.
The figure is a plan view thereof. FIG. 11 is a side view showing a stopper device of the screen printing apparatus. FIG. 12 is a front view showing another example of the fixing device, and FIG. 13 is a plan view thereof. 2: Screen printing device 8: Substrate conveyor, 10: Printed circuit board 12: Screen, 28: Substrate holding device 30: Screen holding device 32: Squeegee device 34: Supporting device, 35: Lifting device 36: Fixing device, 42: Squeegee 44 : Fixed side plate, 46: Movable side plate 72: Support base 92: Lifting plate, 94: Cylinder 164: Bar-shaped member 166: Support pin, 168: Bar support plate 176, 180: Pin support member 200, 222: Board fixing plate 224: Engage Claws 230, 330: drive for fixing

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Iwazuki 19, Chausuyama, Yamamachi, Chiryu-shi, Aichi Fuji Machinery Manufacturing Co., Ltd. (56) References JP-A-62-123793 (JP, A) JP-A-58-44791 (JP, A) JP-A-62-179168 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 3/34 B41F 15/08 303 B41F 15 / 26

Claims (3)

(57) [Claims] 1. A board holding device for holding a printed board,
A screen holding device disposed above the substrate holding device for holding a screen, and a squeegee disposed above the screen holding device so as to be movable along the screen. , A printed circuit board screen printing machine for printing creamy solder or the like, wherein the substrate holding device is configured such that a plurality of bar-shaped members are arranged in parallel with each other, and every other bar-shaped member is integrally connected. And a support device having a support surface, the width of which is changed by the relative movement of the two support members in the longitudinal direction of the bar member, the width of the support surface being formed by the aggregation of the upper surfaces of the bar members. A pair of fixing members that engage with both edges of a plurality of sizes of printed circuit boards selectively supported by and fix those printed circuit boards on a support surface, At least one of the fixing member and the fixing member, wherein the amount of projection upward from the upper surface of the plurality of rod-shaped members is a size that does not prevent the screen from adhering to the printed circuit board at least in a state where the printed circuit board is fixed; A moving member that moves together when moving in the longitudinal direction of the plurality of rod-shaped members, and that holds at least one of the pair of fixed members so as to be relatively movable in a direction approaching or moving away from an edge of the printed circuit board. And a fixing drive device provided between the moving member and the fixed member held by the moving member and configured to relatively move the fixed member with respect to the moving member. Machine. 2. One of the pair of fixing members is a divided fixing member divided into a plurality of parts in a direction parallel to an edge of the printed circuit board, and each of the divided fixing members is formed by a spring. 2. The printed circuit board screen printing machine according to claim 1, wherein the printed circuit board screen printer is urged in a direction approaching the edge, and a movement limit by the urging force is defined by a stopper. 3. The printed circuit board screen according to claim 1, wherein a suction hole is formed on an upper surface of at least a part of the plurality of rod-shaped members, and the suction hole is connected to a vacuum device. Printer.