JP3290633B2 - Screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine, and more particularly, to the support of a printed circuit board when screen printing is performed on a printed circuit board having unevenness on the back side, for example, electronic parts are already mounted on the back side. It is about.

[0002]

2. Description of the Related Art Most printed boards are formed by forming a circuit pattern made of a conductive material on a relatively thin board made of an electrically insulating material such as a synthetic resin, and have flexibility. Therefore, when an adhesive or cream solder is applied to such a printed circuit board for mounting electronic components, a desired shape such as a flat surface is maintained unless the printed circuit board is supported at a number of points on the back side. I can't support it.

When the back surface of the printed circuit board is a flat surface having no unevenness, there is no problem since the printed circuit board can be supported by a support plate having a flat support surface. However, electronic components are already mounted on the back side. When the back surface has irregularities, it becomes difficult to support the back surface. In such a case, the printed circuit board is conventionally supported by a large number of vacuum pins. This printed circuit board support device includes a base plate, a number of negative pressure supply ports opened on the plate surface of the base plate, a negative pressure source connected to the negative pressure supply ports, and a number of negative pressure supply ports connected to the negative pressure supply ports. And a tubular vacuum pin. Then, for example, when the back surface of the printed circuit board has irregularities because the electronic component is already mounted, the vacuum pin is placed at the position of the negative pressure supply port corresponding to the part of the printed circuit board where the electronic component is not mounted. The vacuum pin is held by the holder and fixed to the base plate with bolts, and the other negative pressure supply port is closed with a lid. The printed circuit board is sucked and supported on the distal end surface of the vacuum pin by the negative pressure supplied through the vacuum pin from the negative pressure supply port, and even if warped, the printed board is corrected.

[0004] Further, a printed circuit board is also supported by magnet pins. This printed circuit board support device has a base plate made of a magnetic material and a large number of magnet pins, and the magnetic pins are magnetically placed at positions corresponding to portions of the back surface of the printed circuit board where electronic components are not mounted. It is fixed and the printed circuit board is supported.

However, since different types of printed circuit boards have different mounting positions for electronic components, when supporting the printed circuit board with vacuum pins, it is necessary to change the position of the vacuum pin according to the type of printed circuit board. However, it is necessary to operate the bolt using a tool, which is troublesome, and there is a problem that it takes time to change the setup.

On the other hand, when the printed circuit board is supported by the magnet pins, the magnet pins can be easily moved relative to the base plate, and the setup can be quickly changed even if the type of the printed circuit board is different. However, the warpage of the printed circuit board cannot be corrected as in the case where the printed circuit board is supported by negative pressure, and printing of creamy solder, mounting of electronic components, and the like may not be performed well. In addition, since the magnet pins are only fixed to the base plate by the magnetic force, they are unstable, and when a printing material such as cream solder is printed on the printed circuit board, the squeegee for printing the printing material is moved. It sometimes fell or slipped.

[0007]

SUMMARY OF THE INVENTION The present invention can stably support various types of printed circuit boards, and can perform setup changeover in a short time in view of the above circumstances. SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen printing machine having a printed circuit board supporting device capable of correcting a warpage of a printed circuit board. According to the present invention, the following screen printing machines can be obtained. As in the case of the claims, each aspect is divided into sections, each section is numbered, and if necessary, the other sections are cited in a form in which the numbers are cited. This is for the purpose of facilitating the understanding of the present invention and should not be construed as limiting the technical features and combinations thereof described in the present specification to those described in the following sections. . (1) A printed circuit board supporting device for supporting a printed circuit board, a screen positioning and supporting device for supporting a screen having a large number of through holes for printing so as to be able to contact a printed circuit board supported by the printed circuit board supporting device, and A squeegee device that moves on a screen supported by a screen positioning and supporting device and prints and applies a printing material to a printed circuit board supported by the printed circuit board supporting device through the printing through hole of the screen. The printed circuit board supporting device is mounted on a base plate, a plurality of negative pressure supply ports provided on a flat mounting surface of the base plate, a negative pressure source connected to the negative pressure supply ports, and a close contact with the mounting surface. A possible seating surface, and a pedestal having a container shape including a negative pressure chamber that opens on the seating surface with a larger cross-sectional area than each of the plurality of negative pressure supply ports, A printed circuit board supporting projection protruding from an outer surface of the seat opposite to the seat surface; and a negative pressure supply passage opening to the tip end surface of the printed circuit board supporting projection and the negative pressure chamber; and A screen printing machine in which one of the base plate and the base is formed of a magnetic material, and at least a part of the other is a magnet (claim 1). In this screen printing machine, a printed board is suction-supported by a printed board supporting device, and a printing material is printed and applied by a squeegee device. In the printed board supporting device, the printed board supporting projection is mounted on the mounting surface of the base plate by a magnetic force via the pedestal. When mounting the pedestal to the pedestal, the pedestal is fixed to the pedestal by magnetic force if the seat surface is brought into close contact with the mounting surface in a state where the negative pressure chamber covers the negative pressure supply port. Then, the negative pressure supplied from the negative pressure source to the negative pressure supply port is supplied to the distal end face of the printed board supporting projection through the negative pressure chamber and the negative pressure supply passage, and the printed board is moved to the distal end face of the printed board supporting projection. Adsorbed and supported by If the type of the printed board is different, the position of the printed board supporting projection is changed by moving the pedestal with respect to the base plate. At this time, the pedestal is moved in a range where the state where the negative pressure chamber covers the negative pressure supply port is maintained. Since the negative pressure chamber of the pedestal is opened to the seat surface with a larger sectional area than each of the negative pressure supply ports, if the pedestal is moved in a state where the negative pressure chamber covers the negative pressure supply port, the negative pressure supply passage is provided. The position of the printed board supporting projection can be changed while maintaining the supply of negative pressure to the printed circuit board, and it is possible to cope with a difference in the type of printed board. When a negative pressure is supplied to the negative pressure chamber, the pedestal is also attracted to the base plate by the negative pressure in addition to the magnetic force. Thus, according to this aspect,
The pedestal on which the printed board support projections are projected is fixed to the base plate by magnetic force, so that simply moving the pedestal allows the printed board support projections to be easily and quickly moved to a position corresponding to the type of printed circuit board. The setup can be changed in a short time. Further, since the printed board supporting projections attract the printed board by negative pressure, the warpage of the printed board is corrected. In addition, the pedestal is fixed to the base plate by magnetic force, and when the printed circuit board is supported, it is also attracted to the base plate by negative pressure, so it is firmly fixed to the base plate and printing of the printing material on the printed circuit board is performed. When performed, the printed circuit board can be firmly supported without a risk of falling or shifting. (2) One of the pedestal and the pedestal is provided with a protrusion protruding beyond the mounting surface of the pedestal, and the other is provided with a recess allowing the protrusion to be fitted therein, The pressure chamber is formed in such a shape and size that communication with the negative pressure supply port is always maintained when the projection is fitted into the recess.
The screen printing machine according to item (1). In the printed circuit board supporting device of the screen printing machine according to the present aspect, when the pedestal is moved to change the position of the printed circuit board supporting projection, the movement of the pedestal is regulated by the fitting of the projection into the recess. The negative pressure chamber is formed in such a shape and size that the communication with the negative pressure supply port is always maintained when the projection is fitted into the concave portion, so that the negative pressure chamber is provided regardless of the position of the pedestal with respect to the negative pressure supply port. The chamber is always kept under a negative pressure. As described above, the movement of the pedestal is restricted by the fitting of the protrusion into the recess, and in the restricted state, the negative pressure chamber is always kept in a state of communicating with the negative pressure supply port, so that the pedestal is moved. At this time, it is not necessary to check whether the negative pressure chamber and the negative pressure supply port are in communication with each other, and the pedestal can be moved more easily as compared with a case where the features of this section are not provided. Can be performed in a very short time. (3) The pedestal has a longitudinal shape extending in a direction parallel to the mounting surface of the pedestal, and the negative pressure chamber has a longitudinal shape extending at a constant width along the longitudinal direction of the pedestal. 1)
The screen printing machine according to the paragraph or (2). (4) The screen printing machine according to the above mode (3), wherein the printed board support projection is provided at one end of the pedestal in the longitudinal direction. When the printed circuit board supporting projection is protruded from the center of the pedestal in the longitudinal direction, when the pedestal is rotated in a state where the printed circuit board supporting projection is located farthest from the negative pressure supply port, the printed circuit board support of the pedestal is It is necessary to secure a space for rotation at a portion extending from the projection to the side opposite to the negative pressure supply port. In other words, the adjustable range of the position of the printed circuit board supporting projections is reduced accordingly, but if the printed circuit board supporting projections are protruded at one end in the longitudinal direction of the pedestal, it is necessary to secure extra space for movement. And the position adjustable range can be expanded. (5) A pipe is fixed to the base plate in a state of protruding from the mounting surface, and a protruding portion of the pipe forms the protruding portion and the negative pressure supply port, and a width of the longitudinal negative pressure chamber. The screen printing machine according to the above mode (3) or (4), wherein is slightly larger than the outer diameter of the projecting portion of the pipe and the depth is larger than the projecting amount of the projecting portion. According to the printed circuit board support device of the screen printing machine of this aspect, when the pedestal is fitted to the pipe, a gap is formed between the end surface of the projecting portion of the pipe and the bottom surface of the negative pressure chamber, and the pedestal is attached to the pipe. The negative pressure chamber is maintained in a state of communicating with the negative pressure source at any position. (6) The screen printer according to the above item (5), including at least one cap having an inner diameter capable of fitting to the outside of the pipe and having a depth greater than a projection amount of the pipe from the mounting surface. When the printed circuit board supporting device supports the printed circuit board, if there is any unnecessary printed circuit board supporting projection, the unnecessary printed circuit board supporting projection is removed from the base plate together with the pedestal, and the pipe is covered with a cap. According to this aspect, it is possible to remove a printed board supporting projection unnecessary for supporting the printed board from the base plate while preventing leakage of negative pressure. Preferably, the cap is formed of a permanent magnet. (7) The screen printing machine according to any one of (1) to (6), wherein the pedestal is a permanent magnet. (8) The screen printer according to any one of (1) to (6), wherein the base plate is an electromagnet. If the base plate is made of an electromagnet, for example, when iron powder or the like adheres to the base, the supply of current can be cut off and the magnetic field can be easily removed in a state where the magnetic field has disappeared. (9) The screen printing machine according to any one of (1) to (8), wherein a suction cup is attached to a tip end of the printed board support projection. (10) A base plate in which the base plate has a mounting surface and a seat surface, which are located in one plane, and are opposite to each other, and a plurality of passages respectively opened on the mounting surface side and the seat surface side. A spacer having a communication passage forming opening penetrating in the thickness direction in a shape enclosing the opening on the seat surface side of the plurality of passages, and sandwiching the spacer together with the base to form a communication passage. (1) or including the cover to be formed
The screen printer according to any one of the above aspects (9) (Claim 2). Since the communication passage in the base plate is formed by closing the communication passage forming opening formed in the spacer with the base and the cover, a high flatness is obtained on the surface where the printed circuit board supporting projections support the substrate, The printed circuit board 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 on which the groove is formed is large, and the flatness of the substrate support is reduced. On the other hand, even if an opening for forming a communication passage is formed in the spacer and the passage is formed in the base, the processing strain is small, and when the communication passage is formed between the base and the cover with the spacer interposed therebetween, the flatness of each surface of the base is reduced. Therefore, the flatness of the mounting surface is increased, and the printed circuit board can be supported truly flat. The technical features described in the above modes (1) to (10) can be applied to a printed circuit board supporting device that adsorbs and supports a printed circuit board by negative pressure in an apparatus other than a screen printer. (11) an elevating device for elevating and lowering the printed circuit board supporting device, a substrate conveyor for carrying the printed circuit board above the printed circuit board supporting device in a state where the printed circuit board supporting device is lowered by the elevating device, and the substrate It enters between the printed board carried by the conveyor and the screen supported by the screen positioning and supporting device, and supports the printed board as the printed board supporting device is raised by the elevating device. The screen printer according to any one of (1) to (10), further including: a substrate pressing plate pressed against the printed substrate supporting projection of the apparatus.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. The screen printing machine itself is the same as the Japanese Patent Publication No. 2-1347 except for the printed circuit board supporting device.
It is already known in, for example, Japanese Patent Application Laid-Open No. 5 (1993) -205, and known parts will be described briefly.

As shown in FIGS. 7 and 8, the screen printing machine of the present embodiment is movable with respect to a substrate conveyor 12, a substrate holding device 14 and a bed 10 provided on a fixed bed 10. The apparatus includes a substrate positioning and supporting device 18, a screen positioning and supporting device 20, and a squeegee device 22 provided on the table 16.

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

A screen support 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. These support members 42 and 46 are also provided with pressing plate guides 50 and 52, respectively, so as to guide the substrate pressing plate 54 of the substrate pressing device 14 so as to be movable only in a direction parallel to the transport direction of the printed circuit board 30. Have been. The board holding plate 54 is engaged with an engaging member provided on a chain (not shown), and is moved in a direction parallel to the transport direction of the printed board 30.

The substrate positioning and supporting device 18 includes a movable table 16
It is provided so that the height can be adjusted. The support plate 60 of the substrate positioning and supporting device 18 is connected to a pair of two cam followers 62 fixed to the support plate 60 by a feed screw 68 via a connecting rod 66 connecting the cam rods 64. By being moved, the height can be changed. A substrate support 70 is provided on the support plate 60 so as to be able to move up and down. The substrate support 70 is supported by a support plate 60 on a guide rod 72 fixed via an attachment member 71.
The printed board 30 is moved to the four height positions by the multi-stage cylinder 74 to contact and separate the screen from the screen. The four height positions of the substrate support 70 are determined by the proximity switch 76 provided on the mounting member 71 and the four detection objects 78 provided on the support plate 60.

As shown in an enlarged scale in FIG. 4, the board support table 70 includes a base plate 82 and a plurality of support pins 84 as printed board support projections erected on the base plate 82.
The base plate 82 is, as shown in FIGS.
6, the spacer 88 and the 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 has a flat mounting surface 92.
The other plate surface is a seat surface 94, and the base 8
A plurality of fitting holes 96 penetrating through the tube 6 in the thickness direction are formed, and a pipe 98 is fitted into each of the fitting holes 96. Each of these pipes 98 has a mounting surface 92
, And an opening at the end of the protrusion forms a negative pressure supply port 100.

The spacer 88 has a flat plate shape in close contact with the seating surface 94, and has a communication passage forming opening 102 penetrating in a thickness direction at a portion corresponding to the plurality of pipes 98.
The opening 102 for forming the communication passage is formed by laser processing. After the formation, the two opposite plate surfaces of the spacer 88 are ground, respectively, to obtain flatness. The cover 90 is also formed in a flat plate shape and sandwiches the spacer 88 in cooperation with the base 86, whereby the communication passage forming opening 102 is 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 an outer peripheral portion separated from the communication passage 104.

Although not shown, the cover 90 is formed with a communication hole that penetrates in the thickness direction and communicates 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 passes through the pipe 108, the passage 106, the communication hole, and the communication passage 104.
00 is supplied with negative pressure. An electromagnetic directional control valve (not shown) is provided between the pipe 108 and the negative pressure source 110, and a negative pressure is supplied only when the printed circuit board 30 is supported at the negative pressure supply port 100, and at other times, It is being released to the atmosphere.

The support pins 84 are attached to the base plate 82 by the pedestals 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 functions as a seating surface 116, and the pedestal 114 has a negative pressure chamber 118 opened to the seating surface 116 and has 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 the outer diameter of the pipe 98 as shown in FIG. The length 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. The tip surface of the suction cup 124 is a support pin 84
And slightly larger than the support pin 84. A flange 126 is formed on the other end of the support pin 84 so as to face outward in the radial direction, and a projection 128 is formed concentrically on the end face. 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 protruded from the outer surface of the pedestal 114. In this state, the protruding end surface of the projection 128 faces the negative pressure chamber 118 in the pedestal 114, and the support pin 84 has a negative pressure supply opening to the front end surface and the protruding end surface of the projection 128, that is, the negative pressure chamber 118. A passage 132 is formed.

The pedestal 114 on which the support pins 84 are projected is
In the negative pressure chamber 118, the seat 98 is fitted to the pipe 98 and the seat surface 116 is brought into close contact with the mounting surface 82, and
4 is attracted to the base plate 82 by magnetic force. At this time, since the depth of the negative pressure chamber 118 is greater than the length of the pipe 98 projecting from the mounting surface 92, the base 114 is
When fitted in the negative pressure chamber 11
A gap is formed between the base 9 and the bottom surface of the pipe 9.
8 at any position, the negative pressure chamber 118 is connected to the negative pressure source 11.
It is kept in a state communicating with zero. In the present embodiment,
The negative pressure chamber 118 forms a recess into which the pipe 98 forming the projection fits. When the support pins 84 are attached to the base plate 82 by the pedestals 114, the tip surfaces of the suction cups 124 of the plurality of support pins 84 are located in one plane, and constitute a board support surface for supporting the printed circuit board 30. I do. The pipe 98, the negative pressure chamber 118, and the negative pressure supply passage 132 constitute a terminal passage 134 that opens to the substrate support surface and the seat surface 94 of the base 86.

When the support pins 84 are not necessary, for example, when the printed board 30 is smaller than the board support 70 and there is a portion that does not support the printed board 30, or when the support pins 84 When the number is large, unnecessary support pins 84 are attached to the base plate 8 together with the pedestals 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. However, it is not indispensable to use a permanent magnet, and it may just cover the pipe 98.

As shown in FIG. 7, the screen positioning support device 20 and the squeegee device 22 are provided on a frame 142 mounted on the movable base 16 so as to be rotatable around a horizontal axis 140. A part of the frame 142 constitutes a screen support 144 of the screen positioning and supporting device 20. Screen support 144
A screen 148 attached to the screen frame 146 is fixed on the upper side. As shown in FIGS. 5 and 6, the screen 148 has 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 144 by a fixed cylinder 152.

The squeegee device 22 includes two squeegees 16.
0,162. These squeegees 160, 16
Numeral 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 able to move up and down, and is moved up and down by lifting cylinders 166 and 168. The X-axis slide 164 is moved in the X-axis direction by a feed screw 170, a guide rod 172, and an X-axis drive motor 174.
0, 162 is selectively lowered to the application position by the lifting cylinders 166, 168, and the X-axis slide 16
4 is moved in the X-axis direction, so that the solder is applied to the wiring pattern of the printed circuit board 30.

The movable table 16 is provided on the board conveyor 1.
When the width of the movable rail 2 is changed, the movable rail 26 is moved in the same direction by half the distance, and the substrate positioning support device 18 and the screen positioning support device 2 provided on the movable base 16 are provided.
0, the squeegee device 22 is located at the center in the width direction regardless of the width of the board conveyor 12. When the carriage lead screw 182 connected to the chain 40 by the sprockets 176 and 178 and the chain 180 is rotated by the handle 184, the carriage 1
8 is moved by the guide rod 186 in the left and right direction in FIG. 8, the rotation of the handle 184 is transmitted to the rail feed screw 34 at twice the speed, and the movable rail 26 is twice as long as the movable base 16. They can be moved. When the width of the printed board 30 changes, the board support 70 is also replaced with one that matches the width of the printed board 30.

At the time of screen printing in the screen printing machine configured as described above, a screen 148 according to the type of the printed circuit board is fixed to the screen support 144, and as shown in FIG. The 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 70. The substrate support 70 is at the lower end position when the printed circuit board is carried in, and the substrate holding plate 54 is located above the substrate support 70.

After the printed circuit board 30 is loaded, the substrate support 7
0 is raised and the printed circuit board 30 is
2 and pressed against the substrate holding plate 54. As the board support 70 rises, the positioning pins provided on the fixed rails 24 rise and fit into the positioning holes of the printed board 30 to accurately position the printed board 30.

The plurality of support pins 8 on the substrate support 70
Reference numeral 4 is set in advance at a position corresponding to a portion of the printed circuit board 30 to which 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, the pedestal 114 can be moved by applying a force in a direction parallel to the mounting surface 92, and the pedestal 114 is linearly moved with respect to the pipe 98, Alternatively, the support pin 84 can be moved to a position corresponding to a portion where the electronic component C is not mounted on the printed circuit board 30 by rotating the pipe 98 around the center.

As shown in FIG. 1, when the end of the negative pressure chamber 118 remote from the support pin 84 contacts the pipe 98, the support pin 84 is moved from the center of the pipe 98 to the support pin 8 as shown in FIG.
The distance to the center of No. 4 is a radius, and it can be moved to any position within a circle centered on the center line of the pipe 98. Regardless of the position to which the support pin 84 is moved, the negative pressure chamber 1
The movement of the pedestal 114 fitted to the pipe 98 at 18 is regulated by the pipe 98 so that the negative pressure chamber 118 does not come off from the negative pressure supply port 100 and the supply of the negative pressure to the negative pressure supply passage 132 is maintained. The support pins 84 can be easily and quickly moved while being moved.

The substrate support 70 rises and the printed circuit board 3
0 is lifted from the substrate conveyor 12, the support pins 8
After the suction cup 124 of FIG. 4 abuts on the back surface of the printed circuit board 30 where the electronic component C is not mounted, and presses the printed circuit board 30 against the board holding plate 54, the negative pressure source 110 is pressed.
From 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 substrate support 70 is lowered by a small distance to separate the printed circuit board 30 from the substrate holding plate 54, and the substrate holding plate 54 is retracted from above the printed circuit board 30. Is raised to the rising end position, and the printed circuit board 30 is brought into contact with the lower surface of the screen 148.

Subsequently, 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 60 is raised, the substrate support 70 is lowered, and the printed circuit board 30 is separated from the screen 148. Thus, the solder applied to the printed board 30 escapes from 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 board 30 is supported by the board conveyor 12, and returns to the lowered end position. After the printed board 30 is lowered and the positioning pins provided on the fixed rails 24 are fitted into the positioning holes of the printed board 30 to perform positioning, the supply of the negative pressure to the support pins 84 is cut off, and the printed board is cut off. 30 is released. After the printed board 30 is placed on the board conveyor 12, the board support 70 is further lowered, and the positioning pins are detached from the printed board 30 as the board is lowered.

As described above, according to the present embodiment, since the support pins 84 are attached to the base plate 82 by the magnetic force via the base 114, the support pins 84 can be easily moved with respect to the base plate 82, and the setup can be changed quickly. Can be done.

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 with the base 86 and the cover 90, the communication passage 104 is constituted by the suction cup 124. A high degree of flatness is obtained on the substrate support 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 on which the groove is formed is large, and the flatness of the substrate support is reduced. On the other hand, even if 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. Then, the flatness of the mounting surface 92 of the base 86 is high, and the suction cup 12
4, the flatness of the substrate supporting surface formed by the substrate 4 is increased, and the printed circuit board 30 can be supported truly flat.

In the above embodiment, the support pins 84
Was erected at one end in the longitudinal direction of the pedestal 114,
The support pin 190 shown in FIG. 9 may be erected at the center of the pedestal 192 in the longitudinal direction.

Further, in each of the above embodiments, the negative pressure chamber has a rectangular groove shape and is fitted to the pipe. However, the negative pressure chamber may have a larger sectional area than the negative pressure supply port. Various shapes may be used. For example, if the negative pressure chamber is formed in a circular shape having a diameter larger than that of the negative pressure supply port, the direction of movement of the pedestal becomes free as much as the negative pressure chamber is larger than the negative pressure supply port, and the position of the support pin can be easily set. Can be.

However, as shown in FIG. 1, it is assumed that the negative pressure chamber 118 is just fitted to the pipe 98 and the support pin 84
By erected at the longitudinal end of the pedestal 114, the range in which the position of the support pin 84 can be adjusted can be expanded while avoiding interference between adjacent pedestals. When the support pin is erected at the center of the pedestal, when the pedestal is rotated in a state where the support pin is located farthest from the negative pressure supply port, the support pin is opposite to the negative pressure supply port than the pedestal support pin. It is necessary to secure a space for rotation of the portion extending to the side. In other words, the adjustable range of the position of the support pin is narrowed accordingly, but if the support pin is erected at the longitudinal end of the pedestal, there is no need to secure extra space for movement, and the position adjustment can be performed. 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 118 constitutes a concave portion. However, as shown in FIG. A pin 202 is protruded to form a protrusion.
02 may be fitted into the negative pressure supply port 208 which is provided on the base 206 of the base plate 204 and forms a concave portion to restrict the movement of the pedestal 200.

The negative pressure supply port 208 is a through hole that penetrates through the base 206 and opens into the mounting surface 210 and the seat surface 212, and the pin 202 is formed in the bottom wall 214 of the base 200 toward the negative pressure chamber 216. It is press-fitted in a protruding direction and has a length protruding beyond the mounting surface 210. The 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
Can be set easily and quickly.

As described above, the protrusion is provided on one of the pedestal and the base plate, and the recess is provided on the other, and the protrusion is fitted 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 the protrusion is provided on the base plate side and the concave portion is provided on the pedestal side as in the embodiment shown in FIGS. 1 to 9, it is possible to enlarge the concave portion and widen the movement range of the pedestal with respect to the pedestal plate. Therefore, 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. , A negative pressure supply port, or a through hole opened in the mounting surface and the seating surface of the base as in the embodiment shown in FIG.

In each of the above embodiments, the pedestals 114, 192, and 200 are fitted by fitting the negative pressure chamber 118 to the pipe 98 and fitting the projection 202 to the negative pressure supply port 206.
Movement was regulated, but this is not essential, and neither the base nor the base has projections,
The movement of the pedestal may not be restricted. 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. However, the projection and the recess may be provided on the pedestal and the base plate separately from the negative pressure supply port and the negative pressure chamber.

In each of the above embodiments, the pedestal 11
4,192,200 are made entirely of permanent magnets, but a part may be made of permanent magnets, and the other parts may be made of magnetic material and magnetized, and fixed to the bases 86,206.

Furthermore, in each of the above embodiments, the pedestals 114, 192, and 200 are made of permanent magnets, and the bases 86 and 206 are made of a magnetic material. In this case, all of the bases 86 and 206 may be made of a permanent magnet, or a part may be made of a permanent magnet, and the other part may be made of a magnetic material.

The invention is not limited to the permanent magnet, but may be an electromagnet. For example, the base may be an electromagnet, and the pedestals 114, 19
When fixing 2, a current is supplied to generate a magnetic field. With an electromagnet, for example, when iron powder or the like adheres to the base, the supply of current can be cut off and the magnetic field can be easily removed in a state where the magnetic field has disappeared.

Further, in the above embodiment, the support pins separate from the pedestal constitute the printed board support projections, but the pedestals may be integrally provided with the projections to serve as the printed board support projections.

In the above embodiment, the base plate is constituted by the base, the spacer and the cover, and the communication passage is formed by sandwiching the spacer between the base and the cover. However, the base plate includes the base and the spacer. , To which the substrate support 70 is attached
For example, a communication passage may be formed by interposing a spacer together with the base with another member to function as a cover.

Further, the printed circuit board supporting device of each of the above embodiments is used not only for supporting the printed circuit board in a screen printing machine but also for other purposes such as supporting the printed circuit board in an electronic component mounting device or a circuit inspection device. It is applicable, and in these devices, the setup can be changed in a short time as in the screen printing machine,
There is no danger that the pedestal will fall down or shift when electronic components are mounted, and the effect that the printed circuit board can be firmly supported can be obtained. Further, the present invention can be executed by changing the combination of the elements of the above embodiments.

Although some embodiments of the present invention have been described in detail above, these are merely examples, and the present invention is not limited to the above-mentioned [Problems to be Solved by the Invention, Means for Solving Problems and Effects]. The present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art, including the described embodiment.

[Brief description of the drawings]

FIG. 1 is an enlarged front sectional view showing a main part of a printed circuit board supporting device of a screen printing machine according to an embodiment common to the first and second aspects.

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 supporting device is closed by a cap.

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

FIG. 5 is a plan view showing a screen used in the screen printing machine.

FIG. 6 is a front sectional view showing a part of a state where a printed 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 supporting device of a screen printing machine according to another embodiment of the first and second aspects of the present invention.

FIG. 10 is an enlarged view showing a main part of a printed circuit board device of a screen printing machine according to another embodiment of the first and second aspects of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 printed board 70 board support base 82 base plate 84 support pin 92 mounting surface 98 pipe 100 negative pressure supply port 110 negative pressure source 114 pedestal 116 seating surface 118 negative pressure chamber 132 negative pressure supply passage 190 support pin 192, 200 pedestal 202 pin 204 Base plate 208 Negative pressure supply port 210 Mounting surface 216 Negative pressure chamber

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jun Adachi 19, Chausuyama, Yamamachi, Chiryu-shi, Aichi Fuji Machine Manufacturing Co., Ltd. (56) References JP-A-5-14000 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) B41F 15/26 B41F 15/08 H05K 3/34

Claims (2)

(57) [Claims] A printed circuit board support device for supporting a printed circuit board; a screen positioning support device for supporting a screen having a plurality of through holes for printing so as to be able to contact a printed circuit board supported by the printed circuit board support device. A squeegee device that moves on a screen supported by the screen positioning and supporting device and prints and applies a printing material onto a printed circuit board supported by the printed circuit board supporting device through the printing through hole of the screen. In the above, the printed circuit board supporting device may include: a base plate; a plurality of negative pressure supply ports provided on a flat mounting surface of the base plate; a negative pressure source connected to the negative pressure supply ports; A plurality of negative pressure supply ports, and a negative pressure chamber having a larger cross-sectional area than each of the plurality of negative pressure supply ports. A seat, a printed circuit board supporting projection protruding from an outer surface of the pedestal opposite to the seat surface, and a negative pressure supply passage opening to the distal end surface of the printed circuit board supporting projection and the negative pressure chamber. Shall be included, and one of the base plate and the base is formed of a magnetic material,
A screen printing machine characterized in that at least one of the other is a magnet. 2. A base, wherein the base plate has a mounting surface and a seat surface which are located in one plane and are opposite to each other, and a plurality of passages which are respectively opened on the mounting surface side and the seat surface side. A spacer formed in a flat plate shape and having a communication passage forming opening penetrating in the thickness direction in a shape including the openings on the bearing surface side of the plurality of passages; The screen printing machine according to claim 1, further comprising a cover forming a passage.