JPH0213475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a screen printing machine that prints adhesive or creamy solder on a predetermined portion of a printed circuit board, and in particular, it relates to a screen printing machine that uses a vacuum to attract and hold the printed circuit board. The present invention relates to an improvement of a screen printing machine equipped with a substrate support.

2. Description of the Related Art It is widely practiced to construct an electronic circuit by attaching chip-shaped circuit components to a printed circuit board on which a wiring pattern is formed. For this purpose, it is possible to apply a spot of adhesive to a predetermined location on the printed circuit board, and while the circuit component is temporarily attached to the printed circuit board with the adhesive, the lead wire of the circuit component is soldered to the wiring pattern. A screen printing machine is used as one device for applying this adhesive. In addition, creamy solder is applied to the wiring pattern in advance, and lead wires of circuit components are soldered to the wiring pattern using the creamy solder. A printing press is used.

This screen printing machine is equipped with a board support stand, a screen support stand, and a squeegee. By moving the squeegee over the screen supported by the screen support stand, adhesive is attached to a predetermined part of the printed circuit board supported by the board support stand. It prints solder paste and creamy solder. For this printing, it is necessary to accurately position and fix the printed circuit board on the board support stand, and one method for this is the Japanese Patent Laid-Open No. 60
-Described in Publication No. 106751. In this method, a suction hole is provided in the upper surface of the substrate support, and a suction passage communicating with the suction hole is connected to a vacuum device to fix the printed circuit board to the substrate support using negative pressure.

Problems to be Solved by the Invention If the printed circuit board is attracted to the board support base using negative pressure in this way, it becomes easy to accurately position and fix the printed circuit board on the board support base. If the printed circuit board is warped, it may not be possible to suction the printed circuit board simply by sucking air through the suction holes.

This problem can be solved by suctioning the printed circuit board while it is being held down on the board support by a board holding member, but since a screen is provided above the board support, this screen and the board holding The problem is how to avoid interference with other members. It would be better to move the board support stand to a position away from directly below the screen, position the printed circuit board on the board support stand at that position, and adsorb it to the board support stand while holding it down with the board holding member. In this case, a substrate mounting station is required in addition to the printing station, which causes another problem in that the screen printing machine becomes large. Furthermore, if the substrate support stand is made movable in a direction parallel to the surface of the screen, a problem arises in that the relative positional accuracy between the two during printing inevitably deteriorates.

In view of the above-mentioned circumstances, the present invention has an object to make it possible to reliably adsorb a printed circuit board while being pressed by a board holding member on a board support stand without increasing the size of a screen printing machine. It was created with the aim of solving the problem.

Means for Solving the Problems To this end, the present invention provides a board support stand that is provided with a suction hole on the top surface and that suctions and positions a printed circuit board using negative pressure, and a screen that is disposed above the board support stand. a screen support stand that supports the
A screen printing machine that is equipped with a squeegee that is movable along a straight line above the screen support base, and prints adhesive, creamy solder, etc. on a printed circuit board by moving the squeegee over the screen. , a board transport device for loading and/or unloading printed circuit boards between the screen and the board support, and a board parallel to the top surface of the board support between the board transport device and the screen. An intervening substrate holding member, an operating position of the substrate holding member between the substrate support stand and the screen, and a retracted position where the substrate holding member deviates from the operating position in a direction parallel to the substrate loading and/or unloading direction by the substrate transport device. A holding member moving device that moves the holding member moving device, and a board supporting stand movement that moves the printed circuit board supported by the holding member moving device to a position where the printed circuit board supported by the holding member is pressed against the board holding member in the operating position and a position where it is brought into contact with or close to the screen. It is equipped with a device.

Function: By providing the substrate holding member that moves between the working position between the substrate support stand and the screen and the retracted position away from the working position, the board holding member can be moved in the working position. When the board support stand supporting the printed circuit board is raised, the printed board is pressed against the board support stand by the holding member. Therefore, if negative pressure is supplied to the suction hole of the substrate support in this state, the printed circuit board will be reliably attracted and fixed to the substrate support.

If the board holding member is moved to the retracted position after the printed circuit board is attracted to the board support, the board support can be moved further upward and brought into contact with or close to the screen.

Effects of the Invention Therefore, it is possible to attach a printed circuit board to the substrate support and print on the attached printed circuit board without moving the substrate support in a direction parallel to the plate surface of the screen. Of course, it is necessary to move the substrate holding member, but this can be done with a member of simple shape and small size, so moving the substrate holding member is easier than moving the substrate support stand. In the present invention, this substrate holding member is moved in a direction parallel to the loading and/or unloading direction of the substrate transport device, so it is possible to avoid increasing the size of the screen printing machine due to the movement of the substrate holding member. obtain.

Furthermore, since there is no need to move the board support in a direction parallel to the surface of the screen, it is possible to improve the relative positioning accuracy of the printed circuit board supported on the board support and the screen during printing. It is easy to apply adhesive or creamy solder to a precise position on the printed circuit board.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

The printed circuit board screen printing machine shown in FIGS. 1 and 2 includes a printed circuit board positioning and supporting device 1.
0, a screen positioning support device 12, a squeegee device 14, a substrate conveyor 16, and a substrate holding device 17.

The substrate positioning support device 10 includes a substrate support stand 18
The screen positioning support device 12 positions the screen 24 and the screen frame 26 fixed to the periphery thereof on the screen support base 22, and positions and supports the printed circuit board 20 thereon and raises and lowers it a certain distance. This is what we support. The squeegee device 14 moves a squeegee 28 up and down between a lowered position where it contacts the screen 24 and an upper position, and also moves it in a linear direction along the screen 24. The substrate conveyor 16 functions as a substrate conveyance device,
The printed circuit board 20 is guided by a fixed rail 30 and a movable rail 32, and is carried into between the board support stand 18 and the screen 24 by a pair of endlessly wound ropes 33, and carried out from there. It is something. Then, the board holding device 17 holds the printed circuit board 20 placed on the board support stand 18 using a board holding plate (generally a board holding member).
34 to press against the substrate support stand 18.

Of the above devices, the substrate conveyor 16 and the substrate holding device 17 are fixed to the bed 36 by a plurality of support legs 35, as is clear from FIG. The device 12 and the squeegee device 14 are installed on a movable base 38 that is movable with respect to the bed 36. The movable table 38 is supported by two guide rods 40 arranged parallel to each other on the bed 36 so as to be movable in the left-right direction in FIG. 1 and in the direction perpendicular to the plane of the drawing in FIG. 2. Further, the screen positioning support device 12 and the squeegee device 14 are always in a state of covering the upper part of the substrate positioning support device 10, the substrate conveyor 16, and the substrate holding device 17, but the space above them can be opened by rotation. It is like that. Screen positioning support device 12 and squeegee device 1
A frame 42 supporting 4 is rotatably attached to a pair of columns 44 erected on a movable table 38 by a shaft 46, and is connected to a connecting portion 47 by an actuator (not shown). It can be rotated. The end of the frame 42 remote from the shaft 46 is supported by a column 50 via an adjustment screw 48, thereby connecting the screen positioning support device 12, the squeegee device 14, the substrate positioning support device 10, the substrate conveyor 16, and the substrate. The height relative to the presser support device 17 can be adjusted.

Hereinafter, the configuration of each part of this screen printing apparatus will be explained in detail.

(Substrate Positioning and Supporting Device) As is clear from FIG.
It is equipped with a support plate 62 placed through the support plate 62. That is, a cam rod 66 is provided on the movable table 38 and is supported by a plurality of guide blocks 64 so as to be slidable in the longitudinal direction, and has a slope inclined in the longitudinal direction on its upper surface. 62 is provided with four cam followers 67 having slopes corresponding to the slopes described above, two for each cam rod 66, and the height of the support plate 62 is adjusted as the cam rod 66 moves in the longitudinal direction. It is now possible to adjust the temperature. The two cam rods 66 are connected by a connecting rod 68, and a feed screw 70 parallel to the cam rod 66 is threaded onto the connecting rod 68, and the handle is engaged with the feed screw 70 to rotate. By doing so, the two cam rods 66 can be moved integrally. In addition, the support plate 6
Two guide tubes 72 are fixed to 2 in a posture extending in the vertical direction. Each guide tube 72 is slidably fitted into another guide tube 74 fixed to the movable table 38 to guide the vertical movement of the support plate 62. A spring 76 is disposed between them, and by pulling the support plate 62 toward the movable table 38, the guide block 6
4. The cam rod 66 and the cam follower 67 are kept in close contact with each other to accurately maintain the substrate 62 at a predetermined height.

A rod 78 is slidably fitted into each guide cylinder 72 fixed to the support plate 62, and a longitudinal mounting member 80 extending along the moving direction of the squeegee 28 is fixed to the upper end of the rod 78. ing. Board supports 18 corresponding to printed circuit boards 20 of various sizes are selectively attached to this mounting member 80. A piston rod 84 of a multi-stage cylinder 82 attached to the support plate 62 is fixed to the mounting member 80, and the mounting member 80 and the substrate support stand 18 can be moved to four height positions, namely, a rising end position, a first intermediate position, and a second position. It is adapted to be moved to an intermediate position and a lowering end position. Each of these positions is detected by a proximity switch 86 fixed to the mounting member 80 and four detected objects 88 fixed to the support plate 62. In this embodiment, a guide tube 72, a rod 78, a multistage cylinder 82, a mounting member 80, a proximity switch 86,
The detected object 88 and the like constitute a substrate support table moving device.

As is clear from FIG. 1, the substrate support 18 has a large number of suction holes 90 on its upper surface, and each suction hole 90 connects to a suction pipe 92 through a suction passage formed inside the substrate support 18 and the mounting member 80. This suction pipe 92 is connected to a vacuum device via a switching valve (not shown), so that the board support stand 18 attracts and holds the printed circuit board 20 by negative pressure.

(Screen positioning support device) The screen support stand 22 of the screen positioning support device 12 is constituted by a part of the rotatable frame 42. Screen support stand 2
As is clear from FIG. 2, a positioning block 100, a dial gauge 102, and a fixed cylinder 104 are provided on the cylinder 2. The screen frame 26 is a rectangular frame body, and the screen support base 2
2, two positioning blocks 100 are arranged along one side of the screen frame 26, and
One positioning block 100 is arranged along the other side perpendicular to one side. Adjustment bolts 106 are screwed into portions of the screen frame 26 facing each positioning block 100 in a posture perpendicular to each side of the screen frame 26.
A dial gauge 102 is attached to a portion adjacent to the portion in contact with the dial gauge 102 .

Therefore, with the adjusting bolt 106 in contact with the positioning block 100, adjust the adjusting bolt 1 while watching the indication on the dial gauge 102.
By rotating the screen frame 26, the position of the screen frame 26 can be adjusted accurately. After the adjustment is completed, the fixed cylinder 104 is operated to fix the screen frame 26 to the screen support base 22, and the numerous small holes formed in the screen 24 become areas on the printed circuit board 20 to which creamy solder is to be applied. It can be fixed in an exact match. In this way, once the position has been adjusted, even if the screen frame 26 is removed from the screen support base 22, the adjustment bolts 106 remain fixed to the screen frame 26. There is no need to perform adjustment work when attaching it to the stand 22, improving the efficiency of setup change work. In addition, screen 2
Although the screen 4 is made of a thin stainless steel plate in this embodiment, it is also possible to use other screens such as those coated with synthetic resin on both sides of the Tetron mesh with transparent parts left at predetermined portions.

(Squeegee device) The squeegee device 14 includes two guide rods 110 disposed horizontally and parallel to each other on the rotatable frame 42, and the guide rods 110.
A slide 112 that slides on the top of the slide 112 is provided. As is clear from FIG. 1, the slide 112 is provided with two pairs of guide tubes 114 separated by a distance in a direction perpendicular to the direction of movement of the slide 112. A mounting member 118 is fixed to the lower ends of the two rods 116 that are vertically slidably fitted into each pair of guide tubes 114.
A squeegee 28 is removably attached to. Each mounting member 118 is raised and lowered by a lifting cylinder 120 shown in FIG. 1, thereby moving the squeegee 28 to a lowered position in contact with the screen 24 and a raised position away from it. A nut 122 is fixed to the slide 112, and a feed screw 124 is attached to the frame 42 so as to be rotatable but immovable in the axial direction.
When the two are screwed together and the feed screw 124 is rotated by the servo motor 126, the squeegee 28 is linearly reciprocated along the screen 24.

(Substrate Conveyor) As is clear from FIG. 1, the substrate conveyor 16 includes, in addition to the fixed rail 30 and the movable rail 32, a frame 130 parallel to these. A plurality of rail feed screws 132 are rotatably but immovably spanned in the axial direction. These rail feed screws 132 are screwed into rail nuts 133 fixed to the movable rail 32 at a distance in its longitudinal direction and at right angles to the longitudinal direction. All rail lead screws 132 are connected to sprockets 134 and chain 13 shown in FIG.
5, so that they can be rotated by the same amount in the same direction. Therefore, by rotating one rail feed screw 132, the movable rail 32 is moved toward or away from the fixed rail 30 while maintaining an attitude parallel to the fixed rail 30, and the substrate conveyor 16 width can be easily changed.

The rope 33 that supports and conveys the printed circuit board 20 is guided by guide members 136 and 138 fixed to the fixed rail 30 and movable rail 32, respectively, and is driven by a drive pulley attached to a motor (not shown). It's becoming like that. When the printed circuit board 20 carried in by the rope 33 reaches a position directly above the board support stand 18, it is stopped by a stopper device 140 shown in FIG. The stopper device 140 is a lifting cylinder 14 attached to the support plate 62.
2, the stopper member 144 comes into contact with the front end of the printed circuit board 20 in the raised position to prevent further advancement, and in the lowered position, the printed circuit board 20 advances further. allow it.

The printed circuit board 20 stopped by the stopper device 140 is accurately positioned by the positioning pins 146 shown in FIG. The positioning pins 146 are provided at two locations apart from each other in a direction parallel to the board surface of the printed circuit board 20, and are used to position the printed circuit board by fitting into positioning holes formed in the printed circuit board 20. It is always in the lowered position and is raised as the substrate support stand 18 is raised. That is, the positioning pin 146 is biased in the upward direction by a spring 148, and a protrusion 150 fixed to the positioning pin 146 engages with the lower end of the substrate support base 18, so that the positioning pin 146 is always urged to support the substrate. Since the stand 18 is in the lowered position, the positioning pin 14
6 is also in the lowered position where it does not fit into the positioning hole of the printed circuit board 20. In addition, positioning pin 1
The fact that 46 has risen and fitted into the positioning hole of printed circuit board 20 is detected by proximity switch 152 shown in FIG.

(Movable Rail, Movable Platform Moving Device) As the width of the substrate conveyor 16 is changed, the movable platform 38 can be moved by one-half distance in the same direction as the movable rail 32. As mentioned above, the movable rail 138 has the rail feed screw 132,
It is moved by a rail nut 133, a sprocket 134 and a chain 135, which are further connected to a carriage feed screw 168 by a sprocket 162, a chain 164 and a sprocket 166. The movable table feed screw 168 is rotatably but immovably supported in the axial direction by the bed 36, and a handle 170 is fixed to one end thereof. Movable base feed screw 16
8 is screwed into a movable base nut 172 fixed to the movable base 38 in a position parallel to the rail nut 133. The rail feed screw 132 and the movable table feed screw 168 have the same pitch, but the diameter of the sprocket 166 is different from that of the sprocket 134.
Since the rotation transmission mechanism consisting of the chains 162, 166 and the chains 135, 164 is supposed to transmit rotation at twice the speed, when the movable base feed screw 168 is rotated by the handle 170, the rail feed The screw 132 is rotated at twice the speed and eventually the movable rail 32 is rotated as shown in FIG.
When is moved by a distance l, the movable base 38 is moved by l/2 in the same direction.
In this embodiment, the rotation transmission mechanism, the rail feed screw 132, the rail nut 133, the movable base feed screw 168, and the movable base nut 172 are used to move the presser member to move the movable rail 32 and the movable base 38 in conjunction with each other. The device is configured.

(Screen holder) As shown in FIG. 3, a screen holder 182 is fixed to the movable rail 32 by a support member 180, and together with a screen holder 186 fixed to the fixed rail 30 by a support member 184, the screen The support member 180 supports the middle part of the rail feed screw 1 from below.
The movable rail 32 is supported by the support plate 62 via a guide rod 188 parallel to the movable rail 32, and the difference in the amount of movement between the movable rail 32 and the movable base 38 is allowed by the sliding movement of the support member 180 with respect to the guide rod 188. It's summery. Further, the support member 184 is supported by the support plate 62 via a sliding member 190,
This allows relative movement between the support member 184 and the support plate 62.

(Substrate holding device) As is clear from FIG. 3, the substrate holding device 17 includes a pair of holding plate guides 200 fixed to the support members 180 and 184, respectively. The holding plate guide 200 has a U-shaped cross section, and engages with both side edges of the substrate holding plate 34 to limit the movable direction of the substrate holding plate 34 to one direction. That is, the movement of the substrate holding plate 34 in the vertical direction (direction parallel to the moving direction of the substrate support stand 18) and in the direction perpendicular to the vertical direction and the conveyance direction of the substrate conveyor 16 is prevented, and the movement in the conveyance direction of the substrate conveyor 16 is prevented. It is designed to only allow movement in the direction parallel to . However, the presser plate guide 20
0 has an L-shaped cross section by removing a portion that engages the side edge of the substrate holding plate 34 from above at a portion away from the upper position of the substrate support stand 18. Board holding plate 3
4 can be removed upwards.

Further, a bar 202 is disposed parallel to the fixed rail 30 and the presser plate guide 200 so as to be movable in the longitudinal direction while being guided by a guide member (not shown). As shown in FIG. 4, an endlessly wound chain 204 is connected to the chain 20.
The bar 202 is moved in the longitudinal direction by being driven by a chain drive device 4 comprising a sprocket, a motor, etc. (not shown). Engagement members 206 are attached to two locations separated in the longitudinal direction of this bar 202, and as the bar 202 moves, these engagement members 206
06 engage with the front and rear ends of the substrate holding plate 34 to move the substrate holding plate 34 along the holding plate guide 200. In this embodiment, a holding plate guide 200, a bar 202, a chain 204, an engaging member 206, a chain drive device, etc. are holding members that move the substrate holding plate 34 as a substrate holding member between an operating position and a retreat position. It constitutes a mobile device.

(operation) Next, the operation of this screen printing machine will be explained.

When printing for one type of printed circuit board 20 is finished, the board support stand 18, screen 24, squeegee 28, and board holding plate 34 that have been installed for that printed circuit board 20 are removed.
are removed, and the handle 170 shown in FIG. 2 is rotated to adjust the width of the board conveyor 16 to a width suitable for the printed circuit board 20 to be printed next. At this time, the rail feed screw 132 and the movable base feed screw 1
68 is connected by the rotation transmission mechanism consisting of the sprocket 134 etc. as mentioned above,
As the movable rail 32 is moved relative to the fixed rail 30, the movable platform 38 is moved in the same direction by a half distance. Therefore, the substrate positioning and supporting device 10, screen positioning and supporting device 12, and squeegee device 14 installed on the movable table 38 also move by half the moving distance of the movable rail 34, and the substrate conveyor 16 Even if the width of the substrate conveyor 16 and the substrate holding device 17 is changed, the widthwise centers of the substrate support 18, the screen 24, and the squeegee 28 are maintained in agreement.

Once the width of the board conveyor 16 has been adjusted, the board support stand 18, screen 24, squeegee 28, and board holding plate 34 corresponding to the new printed circuit board 20 are attached to the mounting member 80, screen support stand 22, mounting member 118, and Attach to the presser plate guide 200. This completes the setup change work.

When the printing machine is started, first the substrate conveyor 16
As shown in FIG. 5a, the printed circuit board 20 is carried between the board support stand 18 at the lower end position and the screen 24 above it, and the board holding plate 34 is moved to the operating position. It will be done. When the printed circuit board 20 reaches above the board support stand 18, the stopper device 140 prevents the printed circuit board 20 from moving further.

Subsequently, the substrate support stand 18 is raised by the multistage cylinder 82 to the first intermediate position shown in FIG. 5b. In this process, the board support stand 18 scoops up the printed circuit board 20 from below, and at the same time, the positioning pins 146 fit into the positioning holes of the printed board 20, and the printed board 20 is moved to the board support stand 18.
Position accurately against. After this positioning, the board support stand 18 reaches the first intermediate position, and the printed circuit board 20 is pressed against the board support stand 18 by the board holding plate 34. In this state, the suction tube 92
Negative pressure is supplied to the printed circuit board 20, so that the printed circuit board 20 is reliably attracted to the board support stand 18.

Subsequently, as shown in FIG. 5c, the substrate support stand 18 is
is lowered to the second intermediate position, and the printed circuit board 20 held thereby is slightly separated from the board holding plate 34. Thereafter, the substrate holding plate 34 is retracted from the position above the substrate support stand 18, as shown in FIG. 5d. Therefore, the substrate support stand 18
can be raised to the upper end position as shown in FIG.

Subsequently, in FIG. 2, the left squeegee 28 is raised, and the right squeegee 28 is moved from right to left while contacting the top surface of the screen 24.
A portion of the creamy solder that is pushed over the screen 24 by the right squeegee 28 appears on the screen 2.
It is pushed into a large number of small holes formed in 4 and attached to the upper surface of the printed circuit board 20. After passing above the printed circuit board 20, the right squeegee 28
is raised, the left squeegee 28 is lowered, and the next printed circuit board 20 is ready to be printed by moving the left squeegee 28 from left to right.

When the creamy solder is applied in this way, the widthwise center of the board conveyor 16 and the widthwise center of the printing mechanism including the squeegee device 14 and the like coincide with each other as described above. Substrate support stand 18, screen 24 and squeegee 2
8 also coincides with each other in the width direction, so that the thickness of the cream solder printed on the printed circuit board 20 does not become non-uniform in the width direction of the printed circuit board 20.

After the above operation, the board support stand 18 is lowered to the lower end position, and the printed board 20, which has been printed, is
is again supported by the substrate conveyor 16. Therefore, when the stopper member 144 of the stopper device 140 is lowered and the rope 33 of the board conveyor 16 is driven, the printed printed circuit board 20 is carried out from the position above the board support stand 18, and one cycle of the printed circuit board 20 is carried out. The printing operation ends.

In the embodiment described in detail above, the two engaging members 206 attached to the chain 204 via the bars 202 engage with the front end and the rear end of the board holding plate 34, thereby causing the board holding plate 34 to Although the substrate holding plate can be moved forward and backward, the substrate holding plate can also be moved back and forth by engaging one or more protrusions fixed to the substrate holding plate with a chain.

Further, in the embodiment, the substrate holding plate 34
can be easily removed, and the interval between the pair of presser plate guides 200 that guide it can be changed, so that it is possible to selectively select a board presser plate suitable for the size of the printed circuit board to be printed. However, in a screen printing machine that prints one type of printed circuit board, it is not necessary to make the board holding plate removable, and
Even in the case of a screen printing machine that prints multiple types of printed circuit boards, the board holding plate does not necessarily have to be replaceable. If the board holding plate is compatible with the largest printed circuit board, it is possible to hold smaller printed boards against the board support stand.

Further, the board holding member is not limited to the flat plate-shaped member in the above embodiment, but any suitable board holding member such as a frame-shaped member that contacts only a predetermined portion of the printed circuit board may be used.

Furthermore, it is also possible to use a fluid pressure cylinder to move the board holding member between the active position and the retracted position, and when the board support rises and abuts the board holding member through the printed circuit board. The means for receiving the force is not limited to the substrate holding guide 200, but it is also possible to employ a stopper member that contacts the substrate holding member from above at a plurality of locations.

In the above embodiment, the board transport device carries out the printed circuit board in the direction in which it was carried in, but the carrying-out direction can be reversed to the carrying-in direction, or it may be perpendicular to the carrying-in direction. , it is also possible to use a conveying device that only carries in or out. If only loading or unloading is to be carried out, a worker or another device will carry out either loading or unloading.

In addition, it goes without saying that the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art, although not illustrated individually.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the main parts of a printed circuit board screen printing machine which is an embodiment of the present invention. FIG. 2 is a partially cutaway front view of the main parts of the printing press. FIG. 3 is an enlarged side sectional view showing the vicinity of the substrate conveyor in FIG. 1. Figure 4 is a view in the direction of arrow A in Figure 3 (however,
(The presser plate guide is omitted). Figure 5 a, b,
c, d, and e are explanatory diagrams schematically showing different operating states of the printing press. 10: Substrate positioning support device, 12: Screen positioning support device, 14: Squeegee device, 1
6: Board conveyor (board transport device), 17: Board holding device, 18: Board support stand, 20: Printed circuit board, 22: Screen support stand, 24: Screen, 26: Screen frame, 28: Squeegee, 3
0: Fixed rail, 32: Movable rail, 33: Rope, 34: Board holding plate (board holding member), 38:
Movable base, {72: Guide tube, 78: Rod, 80:
Mounting member, 82: Multi-stage cylinder, 86: Proximity switch, 88: Detected object} (substrate support table moving device),
118: Mounting member, 120: Lifting cylinder, 12
4: Feed screw, 126: Servo motor, {13
2: Rail feed screw, 133: Rail nut, 1
34: Sprocket, 135: Chain, 16
2: Sprocket, 164: Chain, 166:
Sprocket, 168: Movable base feed screw, 17
2: Movable base nut (presser member moving device).

Claims (1)

[Scope of Claims] 1. A board support stand that has suction holes on its top surface and uses negative pressure to adsorb and position a printed circuit board, and a screen support stand that is disposed above the board support stand and supports a screen. Screen printing is equipped with a squeegee that is movable along a straight line above the screen support base, and prints adhesive, creamy solder, etc. on the printed circuit board by moving the squeegee over the screen. In the machine, a board transport device for loading and/or unloading the printed circuit board between the screen and the board support table, and a board transport device between the board transport device and the screen,
A substrate holding member interposed in a posture parallel to the top surface of the substrate support, a position where the substrate holding member acts between the substrate support and the screen, and a substrate loading and/or unloading by the substrate transport device from the working position. a holding member moving device that moves the substrate support to a retracted position in a direction parallel to the direction; 1. A printed circuit board screen printing machine, comprising: a substrate support table moving device that moves the substrate support table to a position where the printed circuit board is brought into contact with or in close proximity to the substrate support table. 2. The substrate holding member has a flat plate shape, and the holding member moving device moves both side edges of the substrate holding member in a direction parallel to the moving direction of the substrate support on both sides of the substrate holding member, and in a direction parallel to the moving direction of the substrate support on both sides of the substrate holding member. engages in a state that prevents movement in a direction perpendicular to the moving direction and the loading and/or unloading direction of the printed circuit board, and guides the board holding member in a direction parallel to the loading and/or unloading direction of the printed circuit board. The printed circuit board screen printing machine according to claim 1, further comprising a pair of holding member guides. 3. The holding member moving device includes: a chain wound around in a direction parallel to the loading and/or unloading direction of the substrate transfer device; a chain drive device driving the chain in both forward and reverse directions; and a chain driving device attached to the chain. 3. The printed circuit board screen printing machine according to claim 2, further comprising: an engaging member that reciprocates the substrate holding member along the holding member guide as the chain moves. 4. The board transfer device includes a fixed rail that engages with and guides one edge of the printed circuit board, and a fixed rail that is movable toward and away from the fixed rail and engages with the other edge of the printed circuit board. and a movable rail whose width can be changed, and one of the pair of presser member guides is fixed to the movable rail and moves together with the movable rail to approach and move away from the other presser member guide. A printed circuit board screen printing machine according to claim 2 or 3, which is configured as follows.