JP6601906B2 - Screen printing device - Google Patents

Description

  The present invention relates to a screen printing apparatus that carries two circuit boards under a screen mask by two conveyor lanes and screen-prints a print pattern on the two circuit boards simultaneously or one by two. It is an invention.

  As this type of screen printing apparatus, there is one described in Patent Document 1 (US Pat. No. 6,066,206). The screen printing apparatus disclosed in Patent Document 1 includes two conveyor lanes that convey two circuit boards with four rails arranged in four rows, and the position of only the first row of rails is fixed. By making the rails into three movable rails that can move in the direction of the conveyor width from the second row to the fourth row, the conveyor width of each conveyor lane (one row) according to the width of the circuit board to be conveyed The rail interval between the eyes and the second row, the rail interval between the third row and the fourth row) can be adjusted.

US Pat. No. 6,066,206

  The configuration of Patent Document 1 has the following problems.

  (1) Of the four rails arranged in four rows, only the rails in the first row are fixed rails, and the three rails from the second row to the fourth row are movable rails. As the conveyor width (width of each circuit board to be transported) becomes narrower, the center position of each circuit board to be transported is closer to the rail side of the first row, which is the fixed rail side, and the print pattern forming position of the screen mask is also 1 There is a tendency that the print quality is lowered due to the rail side of the row. In general, a screen mask tends to have a lower print quality than printing on the center side of the screen mask when printed at a position close to the frame that holds the four sides of the screen mask under tension. In addition, when the print pattern forming position of the screen mask is shifted to one side (frame side) of the screen mask, the print quality tends to be lowered.

  (2) In Patent Document 1, as another example, the first and fourth rows of rails are fixed rails, and the second and third rows of rails are movable rails (that is, two conveyors). In this configuration, the conveyor width of each conveyor lane (the width of each circuit board to be transported) is narrow. Indeed, since the center position of each circuit board to be transported moves closer to both outer sides (frame side) of the screen mask, the print quality also tends to deteriorate.

  (3) In the embodiment of Patent Document 1, when using a screen mask with two patterns brought closer to the center side, the rails in the first row and the fourth row are fixed, the second row and the third row When the rail is movable, it is necessary to move the frame of the screen mask every time printing is performed in each lane.

  (4) In the embodiment of Patent Document 1, when using a screen mask with two patterns brought closer to the center side, the first row of rails is fixed, and the three rows from the second row to the fourth row are fixed. When the rail is movable, it is possible not to move the frame of the screen mask. However, in order to position the rails in the third and fourth rows, it is necessary to input the pitch on which the printing pattern of the screen mask is formed to the control device of the printing press. Therefore, parameters that are not necessary in the conventional printing press are required.

  (5) A printing machine having two conveyor lanes, printing on the front lane, and a printing lane with the back lane passing through the substrate (for example, a printing machine disclosed in JP 2012-099619 A), When using a screen mask with one pattern on the center side, the front rail (first row) of the front lane is fixed, and the rear rail (second row) of the front lane is movable. In some cases, when the substrate size is small, the screen mask may protrude toward the front side of the apparatus. When the amount of overhang is large, printing cannot be performed because the door of the printing press is not closed. If the size of the frame of the screen mask is created according to the substrate size, the problem of overhang can be solved, but there is no freedom in the size of the frame (although there is a desire to make the frame small, in order to facilitate storage management, (There is also a desire to make various screen masks the same frame size). Such problems of the overhang of the frame and the degree of freedom of the frame size also occur in (3) and (4).

  Therefore, the problem to be solved by the present invention is to improve the usability of the screen printing apparatus having two conveyor lanes.

In order to solve the above-mentioned problem, the invention according to claim 1 is arranged so as to straddle two conveyor lanes for conveying two circuit boards in parallel and above the two conveyor lanes. A screen printing apparatus for carrying out screen printing of a printed pattern on each circuit board by carrying each circuit board into a printing area below the screen mask by using each conveyor lane. Each of the two conveyor lanes includes a fixed rail whose position is fixed, and a movable rail that moves in the width direction of the circuit board according to the width of the circuit board to be conveyed and adjusts the conveyor width, the fixed rail arranged on the center side of the printing area, and the first, characterized in that said movable rail has a configuration which is arranged around the side of the printing area, further, When the two circuit boards conveyed by the two conveyor lanes have different widths, the screen mask is shifted in the direction of the circuit board having the larger width so that the outside of the circuit board having the smaller width is placed outside. The second feature is that the empty space is arranged so as to be equal to the empty space outside the circuit board having the larger width. Here, the present invention is not limited to the case where printing is simultaneously performed on two circuit boards conveyed by two conveyor lanes, but may be performed one by one on the circuit board conveyed by each conveyor lane. .

  In this configuration, each of the two conveyor lanes has a fixed rail, but the fixed rail of each conveyor lane is arranged on the center side of the printing area for screen printing on two circuit boards with one screen mask. Therefore, regardless of the conveyor width of each conveyor lane (the width of each circuit board to be transferred), the two circuit boards to be transferred can be arranged close to the center of the printing area. For this reason, even if the conveyor width of each conveyor lane (the width of each circuit board to be transported) becomes narrow, screen printing can be performed on two circuit boards at the center side of the screen mask, and one screen mask can be used. The printing quality when screen printing is performed on two circuit boards can be stabilized.

  In the present invention, a screen mask having a size that can be printed on two circuit boards having the maximum width that can be conveyed by two conveyor lanes is commonly used for screen printing of circuit boards of all widths. Although it is good, in the present invention, even if the width of the two circuit boards is narrowed, the two circuit boards can be printed close to the center of the printing area. The empty space (useless space) on the peripheral side (frame side) of the screen mask increases.

  Therefore, according to the present invention, as in claim 2, the screen mask can be exchanged according to the conveyor width of the two conveyor lanes, and the conveyor width of the two conveyor lanes from a plurality of types of screen masks having different sizes. It is also possible to select a screen mask having a size corresponding to the above and arrange it so as to straddle the upper part of the two conveyor lanes. In this way, if the width of the two circuit boards is narrowed, it becomes possible to screen-print on the two circuit boards using a screen mask having a small size accordingly, and the peripheral side of the screen mask ( It is possible to reduce the empty space (unnecessary space) on the frame side and to effectively use the inside of the screen mask.

By the way, if the center position of the screen mask is made to coincide with the center between the fixed rails of the two conveyor lanes, the screen mask can be used when the widths of the two circuit boards conveyed by the two conveyor lanes are different. Among these, an empty space (useless space) is formed outside the narrower circuit board.

Therefore, in the invention according to claim 1, when the widths of the two circuit boards conveyed by the two conveyor lanes are different, the position of the screen mask is shifted in the direction of the circuit board having the larger width. It is way. In this way, even when the widths of the two circuit boards are different, the empty space on the outer side of the narrower circuit board is made equal to the empty space on the outer side of the wider circuit board. A screen mask can be placed and the size of the screen mask can be minimized.

  In the present invention, since the two circuit boards can be printed close to the center of the printing area regardless of the width of the two circuit boards, the squeegee moves in the direction of the conveyor width of the two conveyor lanes. By setting (in a direction orthogonal to the transport direction), the moving distance of the squeegee for screen printing on the two circuit boards can be minimized, the cycle time of the screen printing operation can be shortened, and the printing speed can be increased. Similarly, by moving the two circuit boards toward the center of the printing area, it is possible to minimize the moving distance of the camera that captures the mask mark on the lower surface of the screen mask and the substrate mark on the upper surface of the two circuit boards. In addition, the time required for the image processing operation of the mask mark and the substrate mark can be shortened, the moving distance of the cleaning unit for cleaning the clean mask from the lower surface side can be shortened, and the cleaning time of the clean mask can be shortened.

FIG. 1 is a diagram for explaining the configuration of a screen printing apparatus according to an embodiment of the present invention. 2A to 2C are diagrams for explaining the printing operation of the screen printing apparatus. FIG. 3 is a diagram for explaining the operation of imaging the mask mark on the lower surface of the screen mask. FIG. 4 is a diagram for explaining a screen mask cleaning operation. FIG. 5 is a block diagram showing the configuration of the control system of the screen printing apparatus. FIG. 6A is a plan view showing a state in which the conveyor width of two conveyor lanes is increased and screen printing is performed on two circuit boards with one screen mask, and FIG. It is a top view which shows the state when reducing the conveyor width | variety of a conveyor lane and screen-printing on two circuit boards with one screen mask. 7A is a plan view showing a state when screen printing is performed with the center position of the screen mask aligned with the center between the fixed rails of the two conveyor lanes, and FIG. 7B shows the width of the screen mask position. FIG. 6 is a plan view showing a state when screen printing is performed while shifting in the direction of a circuit board having a larger size.

Hereinafter, an embodiment embodying a mode for carrying out the present invention will be described.
First, the configuration of the screen printing apparatus will be described with reference to FIG.
The two lifting platforms 11 serving as the base of the screen printing apparatus are each slid in the vertical direction (Z direction) along the lifting guide 14 by driving the Z1-axis feed screw mechanism 13 by the Z1-axis motor 12. It is configured as follows. The two elevators 11 are arranged side by side, and two base parts 15 that support two conveyor lanes 1 and 2 that convey two circuit boards 19 in parallel are arranged on each elevator 11. Is provided so that the position can be adjusted in the X, Y and θ directions. A Z2 axis motor 16 and a Z3 axis motor 17 are respectively fixed to the base portions 15 of the conveyor lanes 1 and 2, and each Z2 axis feed screw mechanism 18 is driven by each Z2 axis motor 16. , 2, the backup pins 20 for supporting and supporting each circuit board 19 from below are moved up and down.

  On the other hand, each of the conveyor lanes 1 and 2 is provided with two rails 21a and 21b for guiding both side edges of the circuit board 19 to be conveyed in the conveying direction (X direction), and a Z3-axis feed screw mechanism (see FIG. The two rails 21a and 21b of the conveyor lanes 1 and 2 are moved up and down by driving (not shown). One rail 21a of the two rails 21a and 21b of each conveyor lane 1 and 2 is a fixed rail 21a whose position is fixed, and the other rail 21b corresponds to the width of the circuit board 19 to be conveyed. The movable rail 21b moves in the width direction of the circuit board 19 and adjusts the conveyor width (interval between the two rails 21a and 21b). Each of the conveyor lanes 1 and 2 has a fixed rail 21a arranged on the center side of a printing area for screen printing on two circuit boards 19 with one screen mask 26, and a movable rail 21b on the peripheral side of the printing area. It is arranged. Accordingly, in FIG. 1, the left conveyor lane 1 has the fixed rail 21a on the right side and the movable rail 21b on the left side, and the right conveyor lane 2 has the fixed rail 21a on the left side and the movable rail 21b on the right side. Yes.

  The distance (conveyor width) between the fixed rail 21a and the movable rail 21b of each conveyor lane 1, 2 is adjusted by moving the movable rail 21b in the width direction of the circuit board 19 by the feed screw mechanism 22. . Inside the two rails 21a and 21b of the conveyor lanes 1 and 2, a conveyor belt 23 for carrying in / out the circuit board 19 is provided, and the circuit board 19 carried into the printing area by the conveyor belt 23 is provided. Both side edges are clamped by being clamped by two rails 21a and 21b.

  The mask support plate 24 is supported by the base portion 15 adjacent to the two rails 21a and 21b of the conveyor lanes 1 and 2, and the distance between the mask support plates 24 on both sides is adjusted by the feed screw mechanism 25. ing. A single screen mask 26 (metal mask) is horizontally installed so as to straddle the two conveyor lanes 1 and 2, and a squeegee 27 is disposed above the screen mask 26. The squeegee 27 is moved along the upper surface of the screen mask 26 by the squeegee moving mechanism 30 (see FIG. 5) in the direction of the conveyor width (direction perpendicular to the conveying direction). The screen mask 26 is formed with a print pattern opening 31 for printing a print pattern such as a solder pattern on the two circuit boards 19, and in the X, Y, θ direction at a plurality of locations on the lower surface of the screen mask 26. A mask mark 32 (see FIG. 3) for positioning the reference position is formed.

  On the other hand, lands or the like for printing a print pattern such as a solder pattern is formed on the upper surface of each circuit board 19, and a plurality of locations (for example, two in the diagonal direction or four in four directions). A substrate mark 33 (see FIG. 3) for positioning a reference position in the X, Y, and θ directions is formed at a location.

  As shown in FIGS. 2B and 3, the screen printing apparatus is provided with a mark imaging camera 34 that images the board marks 33 of the two circuit boards 19 and the mask marks 32 of the screen mask 26. Yes. The camera 34 is moved in the X and Y directions along the lower surface of the screen mask 26 by a moving mechanism 36 (see FIG. 5), and on the lens side of the camera 34, the substrate mark 33 of each circuit board 19 and A prism 35 for imaging both the mask marks 32 of the screen mask 26 is mounted. During operation of the screen printing apparatus, the camera 34 is moved between each circuit board 19 and the screen mask 26 with each circuit board 19 and the screen mask 26 being spaced apart before screen printing. After the 19 substrate marks 33 and the mask marks 32 of the screen mask 26 are imaged in order, the camera 34 is retracted to the outside of the printing area, and one screen mask 26 is superimposed on the two circuit boards 19. Screen printing is performed in the state.

  In the screen printing apparatus, a cleaning unit 41 for wiping off dirt (residual printing material residue) adhering to the screen mask 26 is moved in the Y direction (conveyor width) along the lower surface of the screen mask 26 by the moving mechanism 36 (see FIG. 5). It is provided to be movable in the direction of The cleaning unit 41 is provided with a cleaning head 42 having a suction groove (not shown) that opens upward so as to move up and down, and the cleaning paper 43 can be replaced across the upper surface of the cleaning head 42. It is set. At the time of the cleaning operation, the cleaning head 42 (or the cleaning unit 41) is raised to the uppermost position (cleaning position), the cleaning paper 43 is brought into contact with the lower surface of the screen mask 26, and air is supplied from the suction groove into the cleaning head 42. The cleaning unit 41 is moved along the lower surface of the screen mask 26 while sucking dirt (residual residue of printing material) adhering in the printing pattern opening 31 of the screen mask 26 toward the cleaning paper 43 side. The cleaning paper 43 wipes off dirt adhering to the inside of the print pattern opening 31 of the screen mask 26 and its lower surface side by using the cleaning paper 43 and the used part of the cleaning paper 43 on the cleaning head 42 (dirt). Wipe off part) on one roll Wound into 4a, which is from the other roll 44b to pull out the unused portion of Kuriningupepa 43 on the cleaning head 42.

  The width dimension of the cleaning head 42 and the cleaning paper 43 in the X direction (the conveyance direction of the circuit board 19) is set to be larger than the width dimension in the X direction of the area where the print pattern opening 31 of the screen mask 26 exists. The entire lower surface of the screen mask 26 can be cleaned by performing the cleaning operation of moving the cleaning unit 41 in the Y direction along the lower surface of the screen mask 26 once. After completion of the cleaning operation, the cleaning head 42 (or the cleaning unit 41) is lowered by the elevating mechanism 37 (see FIG. 5), and the cleaning paper 43 on the cleaning head 42 is separated from the lower surface of the screen mask 26. The moving mechanism 36 moves the cleaning unit 41 to a retracted position that does not interfere with the screen printing operation.

  In the present invention, the screen mask 26 of a size that can be printed on the two circuit boards 19 having the maximum width that can be conveyed by the two conveyor lanes 1 and 2 is common to the screen printing of the circuit boards 19 of all widths. However, in this embodiment, even if the width of the two circuit boards 19 is narrowed, the two circuit boards 19 can be printed close to the center of the printing area. As the width of the two circuit boards 19 becomes narrower, the empty space (useless space) on the peripheral side (frame side) of the screen mask 26 increases.

  Therefore, in this embodiment, the screen mask 26 disposed above the two conveyor lanes 1 and 2 can be replaced according to the conveyor width of the two conveyor lanes 1 and 2 (the width of the circuit board 19 to be conveyed). The screen mask 26 having a size corresponding to the conveyor width of the two conveyor lanes 1 and 2 is selected from a plurality of types of screen masks 26 having different sizes, and straddles above the two conveyor lanes 1 and 2. It arranges so that.

  When the size of the screen mask 26 to be used can be changed as in this embodiment, the center position of the screen mask 26 is fixed to the two conveyor lanes 1 and 2 regardless of the size as shown in FIG. Although it may be made to coincide with the center between the rails 21a, in this configuration, as shown in FIG. 7A, the widths of the two circuit boards 19 conveyed by the two conveyor lanes 1 and 2 are different. In this case, an empty space (useless space) is formed outside the circuit board 19 having a smaller width in the screen mask 26.

  Therefore, in this embodiment, when the widths of the two circuit boards 19 transported by the two conveyor lanes 1 and 2 are different, the position of the screen mask 26 is shifted in the direction of the circuit board 19 having the larger width. The screen mask 26 is arranged so that the empty space on the outside of the circuit board 19 with the narrower width is made equal to the empty space on the outside of the circuit board 19 with the wider width.

  The control device 51 (see FIG. 5) that controls the operation of the screen printing apparatus configured as described above is configured mainly by a computer, and includes an input device 52 such as a keyboard, a mouse, and a touch panel, a hard disk, a RAM, a ROM, and the like. The storage device 53 (storage means) is connected to a display device 54 such as a liquid crystal display or a CRT. The control device 51 of the screen printing apparatus performs an operation for screen printing a printing pattern such as a solder pattern on the two circuit boards 19 carried under the screen mask 26 by the two conveyor lanes 1 and 2 as follows. Control.

  As shown in FIG. 2A, the gap between the mask support plates 24 on both sides of the conveyor lanes 1 and 2 is narrowed in advance, and the tip portions of the mask support plates 24 protrude inward from the rails 21a and 21b. Leave it in the state. In this state, when the circuit board 19 is carried to the predetermined printing area by the conveyor belt 23 in each of the conveyor lanes 1 and 2, the rotation of each conveyor belt 23 is stopped and each circuit board 19 is attached to the backup pin 20. Stop at the upper position. Thereafter, the backup pins 20 are raised by the Z2 axis motors 16 of the conveyor lanes 1 and 2 so that the circuit boards 19 are pushed up by the backup pins 20 from below, and both end portions of the circuit boards 19 are attached to the mask support plates 24. Make contact with the bottom surface. In this state, the movable rails 21b of the conveyor lanes 1 and 2 are moved inward to narrow the distance between the two rails 21a and 21b, and both side edges of the circuit boards 19 are clamped.

  Thereafter, as shown in FIG. 2 (b), the distance between the mask support plates 24 on both sides of the conveyor lanes 1 and 2 is increased, and the rails 21a and 21b on both sides are slightly raised by the Z3 axis motor 17 to slightly increase the masks. The heights of the upper surfaces of the support plate 24, the rails 21a and 21b, and the circuit boards 19 are made uniform. In this state, the camera 34 is moved to the mark imaging position between each circuit board 19 and the screen mask 26, and the camera mark 33 on the upper surface of each circuit board 19 and the mask mark 32 on the screen mask 26 are moved by the camera 34. Images are sequentially captured, and the position of the substrate mark 33 and the position of the mask mark 32 are recognized by image processing. Based on the recognition result, the positional deviation in the X, Y, and θ directions between each circuit board 19 and the screen mask 26 is detected. The amount is calculated to obtain a deviation correction value in the X, Y, and θ directions, and the position of each base portion 15 (each circuit board 19) is adjusted in the X, Y, and θ directions by this deviation correction value to obtain each circuit. A positional deviation (printing deviation) in the X, Y, and θ directions between the substrate 19 and the screen mask 26 is corrected.

  In this state, the Z1-axis feed screw mechanism 13 is driven by the Z1-axis motor 12 of the conveyor lanes 1 and 2 so that the mask support plate 24, the rails 21a and 21b, and the circuit boards 19 are integrally raised. Then, these three members are stopped at a position where they are lightly brought into contact with the lower surface of the screen mask 26 as shown in FIG. The squeegee 27 is lowered in parallel with or before or after the substrate raising operation to bring the squeegee 27 into contact with the upper surface of the screen mask 26.

  Thereafter, the squeegee 27 is moved in the direction of the conveyor width (Y direction) along the upper surface of the screen mask 26 to screen-print the print pattern on the upper surfaces of the two circuit boards 19.

  After the screen printing is completed, the mask support plates 24, the rails 21a and 21b, and the circuit boards 19 of the conveyor lanes 1 and 2 are integrally lowered to the original height position, and the rails 21a and 21b are used. The clamps are released and the screen printed circuit boards 19 in the conveyor lanes 1 and 2 are carried out of the screen printing apparatus by the conveyor belt 23.

  In the present embodiment described above, each of the two conveyor lanes 1 and 2 has a fixed rail 21a, but the fixed rail 21a of each conveyor lane 1 and 2 is connected to two circuits by one screen mask 26. 2 circuit boards to be transported regardless of the conveyor width (width of each circuit board 19 to be transported) of the conveyor lanes 1 and 2 because they are arranged on the center side of the printing area for screen printing on the substrate 19 19 can be arranged close to the center of the print area. For this reason, even if the conveyor width of each conveyor lane 1, 2 (the width of each circuit board 19 to be transported) becomes narrow, it becomes possible to screen-print on the two circuit boards 19 on the center side of the screen mask 26, The printing quality at the time of screen printing on the two circuit boards 19 with one screen mask 26 can be stabilized.

  In addition, in this embodiment, the screen mask 26 can be exchanged according to the conveyor width of the two conveyor lanes 1 and 2, and the two conveyor lanes 1 and 2 are selected from a plurality of types of screen masks 26 having different sizes. Since the screen mask 26 having a size corresponding to the conveyor width is selected and arranged so as to straddle the two conveyor lanes 1 and 2, if the width of the two circuit boards 19 becomes narrower, Accordingly, it becomes possible to perform screen printing on the two circuit boards 19 using the screen mask 26 having a small size, and the space (useless space) on the peripheral side (frame side) of the screen mask 26 is reduced. Therefore, the inside of the screen mask 26 can be used effectively.

  However, in the present invention, the screen mask 26 of a size that can be printed on the two circuit boards 19 having the maximum width that can be conveyed by the two conveyor lanes 1 and 2 is common to the screen printing of the circuit boards 19 of all widths. Even in this case, the intended purpose of the present invention can be achieved.

  Further, in this embodiment, when the widths of the two circuit boards 19 conveyed by the two conveyor lanes 1 and 2 are different, the position of the screen mask 26 is shifted in the direction of the circuit board 19 having the larger width. Therefore, even when the widths of the two circuit boards 19 are different, the empty space outside the circuit board 19 having the smaller width is replaced with the empty space outside the circuit board 19 having the wider width. The screen mask 26 can be arranged so as to be equivalent to the above, and the size of the screen mask 26 can be minimized.

  Further, in this embodiment, the two circuit boards 19 can be printed close to the center of the printing area regardless of the width of the two circuit boards 19, so that the moving direction of the squeegee 27 is set to two conveyors. If the direction of the conveyor width of lanes 1 and 2 is set (direction orthogonal to the conveying direction of the circuit board 19), the moving distance of the squeegee 27 for screen printing on the two circuit boards 19 can be minimized, and the screen printing operation can be performed. Cycle time can be shortened to increase printing speed. Similarly, the movement distance of the camera 34 that images the mask mark 32 on the lower surface of the screen mask 26 and the substrate mark 33 on the upper surface of the two circuit boards 19 by bringing the two circuit boards 19 toward the center of the printing area. The time required for the image processing operation of the mask mark 32 and the substrate mark 33 can be shortened, and the moving distance of the cleaning unit 41 for cleaning the clean mask 26 from the lower surface side can also be minimized. The cleaning time of the clean mask 26 can also be shortened.

  The present invention is not limited to the case where printing is simultaneously performed on the two circuit boards 19 conveyed by the two conveyor lanes 1 and 2, but the circuit boards 19 conveyed by the respective conveyor lanes 1 and 2 are printed one by one. You may make it print.

  In addition, the present invention is not limited to the screen printing apparatus having the configuration of the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist, such as the configuration of the screen printing machine may be changed as appropriate. .

  DESCRIPTION OF SYMBOLS 1, 2 ... Conveyor lane, 11 ... Elevating stand, 12 ... Z1 axis motor, 13 ... Z1 axis feed screw mechanism, 14 ... Elevating guide, 15 ... Base part, 16 ... Z2 axis motor, 17 ... Z3 axis motor, 18 ... Z2 axis feed screw mechanism, 19 ... circuit board, 20 ... backup pin, 21a ... fixed rail, 21b ... movable rail, 22 ... feed screw mechanism, 23 ... conveyor belt, 24 ... mask support plate, 25 ... feed screw mechanism, 26 ... Screen mask, 27 ... Squeegee, 31 ... Print pattern opening, 32 ... Mask mark, 33 ... Substrate mark, 34 ... Camera, 35 ... Prism, 51 ... Control device

Claims (4)

Two conveyor lanes for conveying two circuit boards in parallel, and one screen mask arranged so as to straddle above the two conveyor lanes. In a screen printing apparatus for carrying out screen printing of a printed pattern on each of the circuit boards by bringing the substrate into a printing area below the screen mask and overlaying both of them,
Each of the two conveyor lanes includes a fixed rail whose position is fixed, and a movable rail that moves in the width direction of the circuit board according to the width of the circuit board to be conveyed and adjusts the conveyor width, A screen printing apparatus in which a fixed rail is arranged on the center side of the printing area, and the movable rail is arranged on the peripheral side of the printing area ,
When the widths of the two circuit boards transported by the two conveyor lanes are different, the screen mask is shifted in the direction of the circuit board having the larger width so that the outside of the circuit board having the smaller width is placed outside. The screen printing apparatus is arranged so that the empty space is equal to the empty space outside the circuit board having the larger width .   The screen mask can be exchanged according to the conveyor width of the two conveyor lanes, and a screen mask having a size corresponding to the conveyor width of the two conveyor lanes is selected from a plurality of types of screen masks having different sizes. The screen printing apparatus according to claim 1, wherein the screen printing apparatus is selected and disposed so as to straddle above the two conveyor lanes. Moving direction of the squeegee that moves along the upper surface of the screen mask at the time of screen printing, a screen printing apparatus according to claim 1 or 2, characterized in that the direction of the conveyor width of the two conveyor lanes. A camera for imaging a mask mark on the lower surface of the screen mask and a substrate mark on the upper surface of the two circuit boards;
A cleaning unit for cleaning the screen mask from the lower surface side;
Screen printing apparatus according to any one of claims 1 to 3, characterized in that it comprises a moving mechanism for moving said cleaning unit and said camera along a lower surface of the screen mask.

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