JPH0715189A - Supporting device for printed board - Google Patents

Abstract

PURPOSE:To provide a printed board supporting device which can attracts by suction a printed board by its rear surface and can support the printed board in a highly flat state. CONSTITUTION:A porcelain base 86 holds a spacer 88 together with a cover 90 and forms a connecting passage 104 by blocking connecting passage forming openings 102. After fixing a pedestal 104 which is composed of a magnet and supports supporting pins 84 by a magnetic force so that the pedestal 104 can cover negative pressure supplying ports 100, the printed board 30 supporting position of the pins 84 is changed by moving the pedestal 104. A negative pressure is transmitted to the front end faces of the pins 84 through the connecting passages 102, negative pressure transmitting ports 100, negative pressure chambers 118, and negative pressure transmitting passages 132 and suction cups 124 attract and support the printed board 30 by suction. Even when fitting holes 96 are formed in the base 86 and the connecting passage forming openings 102 are formed in the spacer 88, working strains are small and the substrate supporting plane formed by the suction cups 124 becomes highly flat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supporting a printed circuit board from the back side, and more particularly to an apparatus for adsorbing and supporting the printed circuit board by negative pressure.

[0002]

2. Description of the Related Art Most of printed circuit boards have a relatively thin circuit board made of an electrically insulating material such as a synthetic resin and a circuit pattern made of a conductive material formed thereon, and have flexibility. Therefore, when mounting an electronic component on such a printed circuit board, or when applying an adhesive or cream-like solder for mounting the electronic component, the printed circuit board must be supported at a considerable number of points on the back side. , It is not possible to maintain the flat surface with high precision.

Therefore, conventionally, the printed circuit board has been attracted and supported by a negative pressure. This type of printed circuit board supporting device has a printed circuit board supporting member that attracts and supports the printed circuit board by negative pressure, and a negative pressure source connected to the printed circuit board supporting member.

The printed circuit board support device described in Japanese Patent Publication No. 2-13475 is an example. This printed circuit board supporting device is a device for supporting a printed circuit board whose back surface is a flat surface having no unevenness, and has a substrate supporting base as a printed circuit board supporting member formed by stacking two plate materials. A plurality of end passages penetrating in the thickness direction is formed in one plate member, and a communication passage forming groove is formed in the other plate member. The communication passage forming groove is formed in such a manner that the opening of the communication passage forming groove includes the openings of the plurality of end passages on the side of the communication passage forming groove, and the two passage members are connected to each other to form a connection. The opening of the passage forming groove is closed to form a communication passage in the substrate support base. The communication passage is connected to a negative pressure source, the negative pressure is distributed to each end passage by the connection passage, and the printed circuit board is adsorbed and supported by a board supporting surface which is a plate surface of a plate member on which the end passage is formed.

[0005]

However, although the connecting passage forming groove is formed by an end mill,
When the plate member having the end passage is curved along the plate member having the groove, the flatness of the substrate supporting surface is deteriorated when the plate member having the terminal passage is curved when the plate member having the terminal passage is curved when the plate member having a large working strain is formed to form the communication passage. There is a problem that the printed circuit board cannot be accurately supported in a planar shape. In order to reduce the weight, it is usual that the plate material is made thin, and in particular, the plate material in which the end passage is formed is thin, and when two plate materials are superposed, the plate material along which the communication path forming groove is formed is formed. Be distorted. Further, there is a problem that it takes time to process the groove and it takes time to manufacture the substrate support. It is an object of the present invention to provide a printed circuit board supporting device that has a high flatness on a substrate supporting surface, is inexpensive, and is inexpensive.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a gist of the present invention is to provide a printed circuit board supporting member,
(A) a base having a substrate supporting surface and a seating surface which are respectively located in one plane and opposite to each other, and a plurality of end passages which respectively open to the substrate supporting surface and the seating surface; and (b) a flat plate. A spacer having a communication passage forming opening penetrating in the thickness direction and having a shape including the seating surface side openings of the plurality of end passages, and (c) the spacer together with the base to sandwich the communication passage. And a cover to be formed.

[0007]

When the back surface of the printed circuit board is a flat surface having no unevenness, the board supporting surface is a flat surface made of a plate material as in the board supporting base described in the above publication. Also, when the back side of the printed circuit board has an uneven surface such as an electronic component already mounted, it is assumed that the printed circuit board is supported by a large number of protrusions and support pins. Form the substrate supporting surface. In any case, a through hole penetrating in the thickness direction is formed in the base in order to obtain an end passage opening to the substrate supporting surface and the seating surface which are opposite to each other. Even if formed, the processing strain of the base is small. Further, although a communication passage forming opening is formed in the spacer, this opening is also formed so as to penetrate through the spacer in the thickness direction, so that the processing strain of the spacer can be small. Therefore, the flatness of each surface of the base and the spacer is high, and when the base and the cover sandwich the spacer to form the negative pressure supply passage, the substrate supporting surface having the high flatness is obtained.

[0008]

As described above, according to the present invention, it is possible to obtain a printed circuit board supporting device having a high flatness of the substrate supporting surface and capable of accurately supporting the printed circuit board in a planar shape. Further, formation of the negative pressure supply port or opening penetrating the base or the spacer in the thickness direction is easier than the formation of the groove, and the printed circuit board supporting device can be manufactured in a short time, and the cost is reduced. be able to.

[0009]

The following is an example of the case where the present invention is applied to the support of a printed circuit board in a screen printing machine for applying a creamy solder (hereinafter abbreviated as solder) to a wiring pattern of the printed circuit board, based on the drawings. The details will be described. The screen printing machine itself is already known in Japanese Patent Publication No. 2-13475 except the printed circuit board supporting device, and the known parts will be briefly described.

As shown in FIGS. 7 and 8, the screen printing machine according to the present embodiment is movable with respect to the substrate conveyor 12, the substrate pressing device 14, and the bed 10 provided on the bed 10 whose position is fixed. A board positioning support device 18, a screen positioning support device 20, and a squeegee device 22 provided on the table 16 are provided.

The board conveyor 12 is formed by endlessly winding a rope 28 around each of a fixed rail 24 and a movable rail 26. By moving the rope 28, the printed board 30 is moved in the X-axis direction (left and right direction in FIG. 7). Transport to. The width of the board conveyor 12 is adjusted according to the size of the printed board 30 by moving the movable rail 26 by the rail feed screw 34, the nut 36, the sprocket 38, the chain 40, and the like.

A screen receiver 44 is fixed to the fixed rail 24 by a support member 42, and the movable rail 26
A screen receiver 48 is fixed by a support member 46. The support members 42 and 46 are also provided with pressing plate guides 50 and 52, respectively, so that the substrate pressing plate 54 of the substrate pressing device 14 is movably guided only in a direction parallel to the conveyance direction of the printed circuit board 30. Has been done. The board pressing plate 54 engages with an engaging member provided on a chain (not shown) and is moved in a direction parallel to the conveyance direction of the printed board 30.

The substrate positioning and supporting device 18 comprises a movable base 16
The height is adjustable on the top. The support plate 60 of the substrate positioning and supporting device 18 is configured such that a cam rod 64 fitted to a pair of cam followers 62 fixed to the support plate 60 uses a feed screw 68 via a connecting rod 66 connecting the cam rods 64. By being moved, the height can be changed. A board support base 70 as a printed board support member is provided on the support plate 60 so as to be able to move up and down. The substrate support base 70 is guided to the support plate 60 by the guide rod 72 fixed via the mounting member 71, and is moved to four height positions by the multistage cylinder 74 to bring the printed circuit board 30 into contact with the screen. Separate. It should be noted that the four height positions of the substrate support base 70 are determined by the mounting member 71.
Is determined by the proximity switch 76 provided on the support plate 60 and the four detection objects 78 provided on the support plate 60.

As shown in the enlarged view of FIG. 4, the board support base 70 is provided with a base plate 82 and a large number of support pins 84 as the printed circuit board support protrusions provided upright on the base plate 82.
As shown in FIGS. 1 and 2, the base plate 82 has a base 8
6, a spacer 88 and a cover 90 are stacked on each other. The base 86 has a flat plate shape and is made of a magnetic material. One plate surface of the base 86 is a flat mounting surface 92.
And the other plate surface is the seat surface 94, and the base 8
A plurality of fitting holes 96 penetrating through 6 in the thickness direction are formed, and pipes 98 are fitted into the respective fitting holes 96. Each of these pipes 98 has a mounting surface 92.
Forming a negative pressure supply port 100. The projection at the tip of the projection forms a negative pressure supply port 100.

The spacer 88 is in the form of a flat plate that is in close contact with the seating surface 94, and a communication passage forming opening 102 is formed in a portion corresponding to the plurality of pipes 98 so as to penetrate in the thickness direction.
The communication passage forming opening 102 is formed by laser processing, and after the formation, the two plate surfaces of the spacer 88 which are opposite to each other are ground to obtain flatness. The cover 90 also has a flat plate shape, and the spacer 88 is sandwiched in cooperation with the base 86, whereby the communication passage forming openings 102 are closed on both sides to form the communication passage 104. These bases 86,
The spacer 88 and the cover 90 are fixed to the mounting member 71 by bolts at the outer peripheral portion that is disengaged from the communication passage 104.

Although not shown, the cover 90 is formed with a communication hole penetrating in the thickness direction and communicating with the communication passage 104 and the passage 106 (see FIG. 8) formed in the mounting member 71. ing. The passage 106 is connected to a negative pressure source 110 by a pipe 108, and the negative pressure supply port 1 is passed through the pipe 108, the passage 106, the communication hole, and the communication passage 104.
Negative pressure is supplied to 00. An electromagnetic directional control valve (not shown) is provided between the pipe 108 and the negative pressure source 110. Negative pressure is supplied only when the printed circuit board 30 is supported by the negative pressure supply port 100, and otherwise. It is designed to be released to the atmosphere.

The support pin 84 is attached to the base plate 82 by the base 114. The pedestal 114 is made of a permanent magnet and has a rectangular cross section. The pedestal 114 extends in the longitudinal direction and one side surface thereof functions as a seating surface 116. The pedestal 114 is provided with a negative pressure chamber 118 opening to the seating surface 116 and forms a container shape. The negative pressure chamber 118 has a width slightly larger than the outer diameter of the pipe 98 as shown in FIG. 2, a length several times as large as the outer diameter of the pipe 98, and a depth as shown in FIG. It is slightly deeper than the protruding length from the surface 92.

The support pin 84 is made of a non-magnetic material and has a rubber suction cup 124 attached to one end thereof. The tip of the suction cup 124 has a support pin 84.
And has a diameter larger than that of the support pin 84. A radial outward flange 126 is formed at the other end of the support pin 84, and a projection 128 is concentrically provided on the end surface. The projection 128 is press-fitted into a fitting hole 130 formed by penetrating one end of the bottom wall of the pedestal 114 in the longitudinal direction in the thickness direction, and the support pin 84 is provided on the outer surface of the pedestal 114 in a protruding manner. In this state, the protruding end surface of the protrusion 128 faces the negative pressure chamber 118 in the pedestal 114, and the support pin 84 has a negative pressure supply opening to its tip surface and the protruding end face of the protrusion 128, that is, the negative pressure chamber 118. A passage 132 is formed.

The pedestal 114 on which the supporting pin 84 is provided is
In the negative pressure chamber 118, the pipe 98 is fitted, and the seat surface 116 is brought into close contact with the mounting surface 82.
4 is attracted to the base plate 82 by magnetic force. At this time, since the depth of the negative pressure chamber 118 is made deeper than the protruding length of the pipe 98 from the mounting surface 92, the pedestal 114 is attached to the pipe 98.
When fitted to the negative pressure chamber 11
A gap is created between the bottom surface of the pipe 8 and the pedestal 114 and the pipe 9
8, the negative pressure chamber 118 keeps the negative pressure source 11
It is kept in communication with 0. In the present embodiment, the negative pressure chamber 118 constitutes a recess into which the pipe 98 constituting the protrusion is fitted. Also, the support pin 84 is attached to the base 1.
When attached to the base plate 82 by 14, the tip surfaces of the suction cups 124 of the plurality of support pins 84 are located in one plane, and form a board support surface that supports the printed board 30. Further, the pipe 98, the negative pressure chamber 118, and the negative pressure supply passage 132 form an end passage 134 that opens to the substrate support surface and the seat surface 94 of the base 86.

When the support pin 84 is unnecessary, for example, the printed circuit board 30 is smaller than the substrate support base 70 and a portion that does not support the printed circuit board 30 occurs, or the size of the printed circuit board 30 is different from that of the support pin 84. When the number is large, the unnecessary support pins 84 are attached to the base plate 8 together with the base 114.
2, the pipe 98 is covered with a cap 136 as shown in FIG. 3 to prevent leakage of negative pressure. Cap 13
6 is made of a permanent magnet and is fixed to the base plate 82 by magnetic force, but it is not essential to make it of a permanent magnet, and it is only necessary to cover the pipe 98.

As shown in FIG. 7, the screen positioning and supporting device 20 and the squeegee device 22 are provided on a frame 142 rotatably mounted on a movable base 16 around a horizontal shaft 140. A part of the frame 142 constitutes a screen support base 144 of the screen positioning support device 20. Screen support 144
A screen 148 attached to the screen frame 146 is fixed on the top. As shown in FIGS. 5 and 6, the screen 148 is provided with through holes 150 for applying solder to the wiring pattern provided on the printed circuit board 30, corresponding to the wiring pattern. Screen 148
Is positioned in both the X-axis and Y-axis directions by a positioning device (not shown), and is fixed to the screen support base 144 by the fixed cylinder 152.

The squeegee device 22 includes two squeegees 16.
It has 0,162. These squeegees 160, 16
2 is mounted on an X-axis slide 164 provided on the frame 142 so as to be movable in the X-axis direction so as to be lifted and lowered, and is lifted and lowered by lift cylinders 166 and 168. The X-axis slide 164 can be moved in the X-axis direction by the feed screw 170, the guide rod 172, and the X-axis drive motor 174.
0 and 162 are selectively lowered by the lifting cylinders 166 and 168 to the coating position, and the X-axis slide 16
By moving 4 in the X-axis direction, solder is applied to the wiring pattern of the printed circuit board 30.

The movable table 16 is the substrate conveyor 1
When the width of 2 is changed, it is moved in the same direction as the movable rail 26 by a distance of ½, and is provided on the movable base 16 with the substrate positioning support device 18 and the screen positioning support device 2
0, the squeegee device 22 is positioned at the center in the width direction regardless of the width of the substrate conveyor 12. When the movable base feed screw 182 connected to the chain 40 by the sprockets 176 and 178 and the chain 180 is rotated by the handle 184, the movable base 1
6 is guided by the guide rod 186 to be moved in the left-right direction in FIG. 8, and the rotation of the handle 184 is transmitted to the rail feed screw 34 at twice the speed, so that the movable rail 26 moves twice as far as the movable base 16. It can be moved. When the width of the printed circuit board 30 changes, the substrate support base 70 is also replaced with a suitable one for the width of the printed circuit board 30.

At the time of screen printing in the screen printing machine configured as described above, the screen 148 corresponding to the type of printed circuit board is fixed to the screen support base 144, and the electronic component C is attached to the back side as shown in FIG. The printed printed circuit board 30 is conveyed to the screen 14
8 is contacted from below. The movement of the printed board 30 conveyed by the board conveyor 12 is stopped by a stopper device (not shown), and is stopped just above the board support base 70. The substrate support base 70 is at the lower end position when the printed circuit board is loaded, and the substrate pressing plate 54 is located above the substrate support base 70.

After the printed circuit board 30 is loaded, the board support base 7
0 is raised to move the printed board 30 to the board conveyor 1
It is lifted from 2 and pressed against the substrate pressing plate 54. As the board support base 70 rises, the positioning pins provided on the fixed rail 24 ascend and fit into the positioning holes of the printed board 30 to accurately position the printed board 30.

A plurality of support pins 8 are provided on the substrate support base 70.
4 is set in advance at a position corresponding to a portion of the printed circuit board 30 where the electronic component C is not attached, according to the type of the printed circuit board 30. Since the pedestal 114 is only attracted to the base 86 by magnetic force, it can be moved by applying a force in a direction parallel to the mounting surface 92 to the pedestal 114, and the pedestal 114 is linearly moved with respect to the pipe 98. Alternatively, the pipe 98 can be rotated to move the support pin 84 to a position corresponding to a portion of the printed circuit board 30 where the electronic component C is not attached.

As shown in FIG. 1, the support pin 84 extends from the center of the pipe 98 when the end of the negative pressure chamber 118 farther from the support pin 84 contacts the pipe 98.
The distance to the center of 4 is the radius, and the pipe can be moved to any position within a circle centered on the center line of the pipe 98. Whichever position the support pin 84 is moved to, the negative pressure chamber 1
The movement of the pedestal 114 fitted to the pipe 98 at 18 is restricted by the pipe 98, the negative pressure chamber 118 does not come off from the negative pressure supply port 100, and the supply of negative pressure to the negative pressure supply passage 132 is maintained. Meanwhile, the support pin 84 can be moved easily and quickly.

The board support base 70 moves up to raise the printed circuit board 3
When lifting 0 from the substrate conveyor 12, the support pin 8
The suction cup 124 of No. 4 contacts the portion of the back surface of the printed circuit board 30 where the electronic component C is not mounted, presses the printed circuit board 30 against the substrate pressing plate 54, and then the negative pressure source 110
A negative pressure is supplied from the support pin 84 to the printed circuit board 30.
Adsorb and support. At this time, the pedestal 114 is attracted to the base 86 by the negative pressure supplied into the negative pressure chamber 118,
The pedestal 114 is firmly fixed to the base 86 by the magnetic force and the negative pressure.

Next, the board support base 70 is lowered by a small distance so that the printed board 30 is separated from the board holding plate 54, and the board holding plate 54 is retracted from above the printed board 30. Are raised to the raised end position and the printed circuit board 30 is brought into contact with the lower surface of the screen 148.

Next, of the squeegees 160 and 162,
One squeegee 160 is lowered and the screen 14
8 and moved in the X-axis direction,
Solder is applied to the printed circuit board 30 through the through holes 150 formed in the screen 148.

When the solder application is completed, the squeegee 1
After raising 60, the substrate support 70 is lowered and the printed circuit board 30 is separated from the screen 148. As a result, the solder applied to the printed board 30 comes out of the through hole 150 and is printed on the printed board 30 in a predetermined pattern. Substrate support 70
Is lowered even after the printed circuit board 30 is supported by the substrate conveyor 12, and returns to the lowered end position. After the printed circuit board 30 descends and the positioning pins provided on the fixed rail 24 are fitted into the positioning holes of the printed circuit board 30 for positioning, the supply of the negative pressure to the support pins 84 is cut off, and the printed circuit board 30 is cut off. 30 is released. After the printed board 30 is placed on the board conveyor 12, the board support base 70 is further lowered, and the positioning pins are separated from the printed board 30 as the board is lowered.

As described above, according to this embodiment, the support pin 8
Since 4 is attached to the base plate 82 by magnetic force via the base 114, it can be easily moved with respect to the base plate 82, and the setup can be quickly changed.

Further, since the communication passage 104 in the base plate 82 is formed by closing the communication passage forming opening 102 formed in the spacer 88 by the base 86 and the cover 90, it is constituted by the suction cup 124. High flatness is obtained on the substrate supporting surface, and the printed circuit board 30 can be supported truly flat. The negative pressure supply passage can also be formed by forming a groove in the plate material and closing the opening of the groove with another plate material. However, in that case, the processing strain of the plate material in which the groove is formed is large, and the flatness of the substrate support becomes low. On the other hand, even when the communication passage forming opening 102 is formed in the spacer 88 and the fitting hole 96 is formed in the base 86, the processing strain is small, and the base 86 and the cover 90 form the communication passage 104 with the spacer 88 interposed therebetween. At this time, the flatness of the mounting surface 92 of the base 86 is high and the suction cup 12
Since the flatness of the substrate supporting surface formed by 4 is increased, the printed circuit board 30 can be supported truly flat.

In the above embodiment, the support pin 84 was erected at one end of the pedestal 114 in the longitudinal direction, but it is erected at the center of the pedestal 192 in the longitudinal direction like the support pin 190 shown in FIG. May be.

Further, in each of the above embodiments, the negative pressure chamber has a rectangular groove shape and is just fitted into the pipe. However, the negative pressure chamber may be opened with a cross-sectional area larger than the negative pressure supply port. However, various shapes can be used. For example, if the negative pressure chamber has a circular shape with a diameter larger than that of the negative pressure supply port, the negative pressure chamber is larger than the negative pressure supply port, so that the pedestal can move freely and the position of the support pin can be easily set. You can

However, as shown in FIG. 1, the negative pressure chamber 118 is just fitted to the pipe 98, and the support pin 84 is
By erected at the end of the pedestal 114 in the longitudinal direction, it is possible to expand the range in which the position of the support pin 84 can be adjusted while avoiding the interference between adjacent pedestals. When the support pin is erected in the center of the pedestal, when rotating the pedestal with the support pin at the position farthest from the negative pressure supply port, the support pin on the pedestal is opposite to the negative pressure supply port. It is necessary to secure a space for turning also in the part extending to the side. In other words, the position adjustable range of the support pin is narrowed accordingly, but if the support pin is erected at the end of the pedestal in the longitudinal direction, it is not necessary to secure an extra space for rotation, and the position adjustment is possible. The possible range can be expanded.

Further, in each of the above embodiments, the pipe 98 projecting from the base 86 constitutes a projecting portion, and the negative pressure chamber 1
Although 18 formed the recessed portion, as shown in FIG.
2 may be provided in the base 206 of the base plate 204 to be fitted into the negative pressure supply port 208 that constitutes a concave portion to regulate the movement of the base 200.

The negative pressure supply port 208 is a through hole penetrating the base 206 and opening to the mounting surface 210 and the seat surface 212. The pin 202 is located on the bottom wall 214 of the pedestal 200 on the negative pressure chamber 216 side. It is press-fitted in a protruding direction and has a length protruding beyond the mounting surface 210. Movement of the pedestal 200 is restricted by the pin 202 being fitted into the negative pressure supply port 208, and the support pin 84 is
The position of can be set easily and quickly.

As described above, the protrusion is provided on one of the pedestal and the pedestal, and the recess is provided on the other to fit the protrusion into the recess, thereby restricting the movement of the pedestal and setting the position of the support pin 84. Can be done easily and quickly,
In particular, if a protrusion is provided on the base plate side and a recess is provided on the base side as in the embodiment shown in FIGS. 1 to 9, the recess can be enlarged to widen the range of movement of the base with respect to the base plate. ,
The degree of freedom in setting the position of the support pin is increased.

Further, in each of the embodiments shown in FIGS. 1 to 9, the negative pressure supply port is formed by a pipe separate from the base plate, but a projection is integrally provided on the mounting surface of the base plate. The negative pressure supply port may be formed, or, as in the embodiment shown in FIG. 10, it may be formed by a through hole that is opened in the mounting surface and the seat surface of the base.

Further, in each of the above embodiments, the negative pressure chamber 1
The movement of the pedestals 114, 192, and 200 was restricted by the fitting of the pipe 18 and the pipe 98 and the fitting of the protrusion 202 and the negative pressure supply port 206, but this is not essential, and the pedestal and the base are not required. It is also possible not to provide a protrusion on either of them and not restrict the movement of the pedestal. This is because when the operator moves the pedestal, the negative pressure chamber may be kept in a state of covering the negative pressure supply port.

Further, in each of the above embodiments, the negative pressure supply port also serves as a projection or a recess for restricting the movement of the pedestal, and the negative pressure chamber also serves as a recess, so that the number of parts is small. However, the protrusions and recesses may be provided on the base and the base plate separately from the negative pressure supply port and the negative pressure chamber.

Further, in each of the above embodiments, the pedestal 11
Although the whole 4,192,200 is made of a permanent magnet, a part may be made of a permanent magnet and the other part may be made of a magnetic material to be magnetized and fixed to the bases 86, 206.

Further, in each of the above embodiments, the pedestal 1
Although 14, 192 and 200 are made of permanent magnets and the bases 86 and 206 are made of magnetic material, they may be reversed. In this case, all of the bases 86 and 206 may be made of permanent magnets, or some of them may be made of permanent magnets and the other portions may be made of magnetic material.

Further, not only a permanent magnet but also an electromagnet may be used. For example, the base is an electromagnet, and the pedestals 114 and 19
When 2 is fixed, a current is supplied to generate a magnetic field. By using an electromagnet, for example, when iron powder or the like adheres to the base, the current supply can be cut off and the magnetic field can be easily removed in a state where the magnetic field is extinguished.

Further, in the above-mentioned embodiment, the support pin which is separate from the pedestal constitutes the printed circuit board supporting protrusion, but the pedestal may be integrally provided with the supporting pin to form the printed circuit board supporting protrusion.

In the above embodiment, the base plate is the base,
Although the communication passage is formed by the spacer and the cover, and the spacer is sandwiched between the base and the cover, the base plate includes the base and the spacer, and the mounting member 71 to which the substrate support base 70 is mounted, etc.
The spacer may be sandwiched with another member together with the base to function as a cover to form the communication passage.

Further, when the convex portion can be supported even if the back surface of the printed circuit board has irregularities, the substrate supporting surface is a flat surface made of a plate material, and the end surface of the convex portion is supported. May be.

Furthermore, the printed circuit board supporting device of the present invention can be applied not only for supporting a printed circuit board in a screen printing machine, but also for other purposes such as supporting a printed circuit board in an electronic component mounting device or a circuit inspection device. Is. Further, the present invention can be carried out by changing the combination of the respective elements of the above respective embodiments.

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

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing an enlarged main part of a printed circuit board support device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a front sectional view showing a state in which a negative pressure supply port of the printed circuit board support device is closed by a cap.

FIG. 4 is a plan view showing the printed circuit board support device.

FIG. 5 is a plan view showing a screen used in a screen printing machine including the printed circuit board supporting device.

FIG. 6 is a front sectional view showing a part of a state where a printed circuit board is brought into contact with the screen.

FIG. 7 is a front view (partial cross section) showing the screen printing machine.

FIG. 8 is a side view (partial cross section) showing the screen printing machine.

FIG. 9 is an enlarged view showing a main part of a printed circuit board support device according to another embodiment of the present invention.

FIG. 10 is an enlarged view showing a main part of a printed circuit board device according to still another embodiment of the present invention.

[Explanation of symbols]

 30 printed circuit board 70 board support base 82 base plate 84 support pin 86 base 88 spacer 90 cover 94 seat surface 98 pipe 102 communication passage forming opening 104 communication passage 110 negative pressure source 118 negative pressure chamber 124 suction cup 132 negative pressure supply passage 134 Terminal passage 190 Support pin 206 Base 212 Seat surface 216 Negative pressure chamber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Adachi No. 19 Chausan, Yamamachi, Chiryu City, Aichi Prefecture Fuji Machine Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A printed circuit board supporting device having a printed circuit board supporting member for adsorbing and supporting a printed circuit board by negative pressure, and a negative pressure source connected to the printed circuit board supporting member, wherein the printed circuit board supporting member comprises: A base having a substrate supporting surface and a seating surface which are respectively located in a plane and opposite to each other, and a plurality of end passages which respectively open to the substrate supporting surface and the seating surface; A spacer formed with a communication passage forming opening penetrating in the thickness direction in a shape including the opening on the seating surface side of a plurality of end passages; and a cover that sandwiches the spacer together with the base and forms a communication passage. A printed circuit board supporting device characterized in that it is included.