JP2011161781A - Printing method in screen printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To print even on a printed board long in size of a conveying direction without changing the size of a screen. <P>SOLUTION: A printed board P is positioned, and a screen recognition camera positions a screen recognition mark by imaging and recognizing a substrate recognition mark by a substrate recognition camera 8 and correcting relative positional shifting between the board P and a screen 1. Then, the board P is firmly attached to the lower surface of the screen 1, and a squeegee 5A is moved to execute printing via the printing pattern hole of a small printing pattern area PA2. Then, a large printing pattern area PA1 is moved so as to be positioned above the board P to be positioned. The screen recognition mark and the board recognition mark are imaged to be recognized again. Similarly, relative positional shifting is corrected, the board P is firmly attached to the lower surface of the screen 1, and a squeegee 5B is moved to execute printing via the printing pattern hole of the large printing pattern area PA1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a printing method in a screen printing machine that includes a pair of squeegees and applies a coating agent by moving one of the squeegees onto a printed board.

  This type of screen printing machine is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-228707. However, when the printed circuit board becomes larger, the screen plate must be enlarged.

JP 2009-297897 A

  However, if the screen is enlarged when screen printing is performed on a large printed circuit board, the screen printing machine becomes large.

  Accordingly, an object of the present invention is to enable printing on a printed circuit board having a long size in the transport direction without changing the size of the screen.

  Therefore, according to a first aspect of the present invention, there is provided a printing method in a screen printing machine that includes a pair of squeegees, and applies the coating agent by moving one of the squeegees onto the printed circuit board. It is characterized in that printing is performed separately by using a squeegee.

  The second invention is a printing method in a screen printing machine comprising a pair of squeegees and applying a coating agent by moving one of the squeegees on a printed circuit board that has been transported and positioned from upstream, and is long in the transport direction. The printed board is divided into two in the transport direction, and each is printed separately by a separate squeegee.

  According to a third aspect, in the second aspect, the moving direction of the squeegee is orthogonal to the transport direction of the printed circuit board, and the length of the printed circuit board in the transport direction is longer than the length of the squeegee.

  Furthermore, a fourth invention is a printing method in a screen printing machine comprising a pair of squeegees and applying a coating agent by moving one of the squeegees on the printed circuit board. Thus, printing is performed on one of the two divided areas with one squeegee on the basis of one side, and on the other region with the other squeegee on the other side.

  According to the present invention, it is possible to print on a printed circuit board having a long size in the transport direction without changing the size of the screen.

It is a state before printing on the first small print pattern area of the first sheet, and the upper part shows the plane of the screen and the lower part shows the plane of the fixed chute and the movable chute. It is a state after printing on the first small print pattern area of the first sheet, and the upper part shows the plane of the screen and the lower part shows the plane of the fixed chute and the movable chute. It is a right side view of a screen printer for showing a printing operation on the first printed circuit board. It is a state before printing on the first large print pattern area of the first sheet, and the upper part shows a plane of the screen and the lower part shows a plane of the fixed chute and the movable chute. It is a state before printing on the first large print pattern area of the first sheet, and the upper part shows a plane of the screen and the lower part shows a plane of the fixed chute and the movable chute. It is a right view of the screen printer for showing the printing operation to the 2nd printed circuit board.

  Hereinafter, embodiments of a printing method in a screen printing machine for applying a solder paste HP as an application agent on a printed board P will be described with reference to the drawings. In FIG. 1 schematically showing a plan view of a screen 1 of a screen printing machine and a plan view of a substrate transporting support device 2, the screen 1 supports and fixes the screen plate 3 having printing pattern holes and the screen plate 3. Supporting frame 4. The squeegees 5A and 5B can be moved in the Y-axis direction (front-rear direction of the screen printing machine) by a moving mechanism having a Y-axis drive motor, and can be moved up and down by each vertical movement drive source. A large print pattern area PA1 and a small print pattern area PA2 are formed on the screen plate 3 along the moving printing direction. The length of the printed board P in the transport direction is longer than the length of the squeegees 5A and 5B (the length of the printing width by the squeegee).

  The screen 1 can be moved in the Y direction (see the arrow in FIG. 1, the front and rear direction of the screen printer) by a moving mechanism having a Y-axis drive motor. A screen recognition mark attached to the screen 1 is picked up by a screen recognition camera, and an image picked up by the recognition processing device is subjected to recognition processing. Based on the recognition processing result, a control device (not shown) is connected to the screen 1. Grasp the position of The screen recognition camera is configured to be movable in the X direction (substrate transport direction) and the Y direction (front-back direction of the screen printing machine) by a moving mechanism including an X-axis drive motor and a Y-axis drive motor.

  A substrate support unit installed in the apparatus main body is disposed below the screen 1, and this substrate support unit includes an X-axis drive motor, a θ-axis drive motor, and a vertical movement drive source, and is in the X-axis direction in a horizontal plane. A movable mechanism (not shown) that can move in the angle direction and the vertical direction, a pair of front and rear substrate transport conveyors that transport the printed circuit board P in the X-axis direction, and the printed circuit board P from the lower surface by contacting the lower surface thereof. A backup table that stores the support pins to be supported and is disposed in an appropriate position according to the printed circuit board P and is movable in the Z direction; and a fixed chute 6A that supports the printed circuit board P from the side. And a movable chute 6B.

  Further, when the printed circuit board P flows from the left to the right in FIG. 1 by the substrate conveying conveyor capable of forward and reverse conveyance, the stopper 7A that the printed circuit board P contacts and locks is also provided on the opposite side. Stoppers 7B are provided in the substrate transport path so as to be able to appear and disappear.

  A substrate recognition camera 8 is provided between the screen 1 and the fixed chute 6A and the movable chute 6B to image the substrate recognition mark on the printed circuit board P supported by the fixed chute 6A and the movable chute 6B. The substrate recognition camera 8 is movable in the X direction (substrate transport direction) and the Y direction (front-back direction of the screen printing machine) by a moving mechanism including an X-axis drive motor and a Y-axis drive motor. The board recognition mark is picked up by the board recognition camera, the image picked up by the recognition processing device is recognized, and the control device (not shown) determines the position of the printed circuit board P based on the recognition processing result. To grasp.

  The control device is composed of a microcomputer, and the control device controls the drive motors and the like constituting the moving mechanisms via the drive circuits. Then, based on the recognition processing result, the control device calculates the amount of positional deviation for positioning the position of each substrate recognition mark and the position of each screen recognition mark, and stores the calculation result in a built-in storage unit. Based on this positional deviation amount, the control device controls the X-axis drive motor and the θ-axis drive motor of the backup table and also controls the Y-axis drive motor of the screen, so that the relative relationship between the printed circuit board P and the screen 3 is controlled. Correct the misalignment for positioning.

  Further, since the length in the transport direction of the printed circuit board guided and supported by the fixed chute 6A and the movable chute 6B corresponds to the length in the transport direction of the screen 1, the squeegee moves once as described later. When printing is performed on the printed circuit board P whose length in the transport direction is longer than the normal printable length, for example, the length in the transport direction of the printed circuit board is longer than a reference dimension (slightly shorter than the length of the squeegee). In this case, when printing on the small print area PAA2, the downstream end of the printed circuit board P protrudes outward from the fixed chute 6A and the movable chute 6B, and conversely when printing on the large print area PAA1. The upstream end of the printed circuit board P is protruded outward from the fixed chute 6A and the movable chute 6B. Then, the printed circuit board P having a long length in the transport direction is divided into two in the transport direction, and the solder paste HP is printed on the small print pattern area PA2 of the screen 1 on the small print area PAA2 of the print circuit board P. Printing is performed through the pattern holes, and the solder paste HP is printed on the large print area PAA1 through the print pattern holes in the large print pattern area PA1 of the screen 1.

  Next, the printing operation on the printed circuit board P will be described. First, since the stopper 7A that can be moved in and out appears in the circuit board conveyance path, the printed circuit board P inherited from the upstream side is moved to the lower part of FIG. As shown in the drawing, the sheet is conveyed from the left to the right, and the right end of the printed circuit board P is brought into contact with and locked by the stopper 7A.

  The screen recognition mark attached to the screen 1 is imaged by the screen recognition camera while the printed board P is supported with the fixed chute 6A and the movable chute 6B sandwiched from the side (see FIG. 3A). At the same time, the board recognition mark attached to the printed board P is imaged by the board recognition camera 8, the recognition processing device recognizes these images, and both recognition processing results are sent to the control device. Then, in the control device, based on the recognition processing result, the position shift amount for relatively positioning the position of each substrate recognition mark and the position of each screen recognition mark is calculated, and the calculation result is stored in the built-in RAM. The control device controls the X-axis drive motor and the table θ-axis drive motor of the substrate support unit and the Y-axis drive motor of the moving mechanism of the screen 1 on the basis of the positional deviation amount. And the relative position shift between the screen 1 and the screen 1 are corrected.

  Then, the substrate recognition camera 8 is further retracted and the substrate support unit is raised to bring the printed circuit board P supported by the support pins into close contact with the lower surface of the screen 1 (see FIG. 3B), and the stopper 7A. Is retracted from the conveyance path, the squeegee 5A is lowered, and the squeegee 5A, 5B is moved rearward (from left to right (direction perpendicular to the conveyance direction of the printed circuit board)) by the moving mechanism, FIG. The squeegee 5A prints the solder paste HP on the print area PAA2 of the printed board P through the print pattern hole of the small print pattern area PA2 of the screen 1 (FIGS. 2 and 3B). reference).

  Next, as shown in FIG. 3C, the substrate support unit is lowered after printing on the small print area PAA2. The stopper 7B appears in the board conveyance path, the board recognition camera 8 moves to a position above the printed board P, and the squeegee 5A is lifted up so that the screen 1 is large above the large printing area PAA1 of the printed board P. The moving mechanism moves in the Y direction (left direction in FIG. 3C) so that the printing pattern area PA1 is positioned. Further, the holding of the printed board P between the fixed chute 6A and the movable chute 6B is released, and as shown in the lower part of FIG. 4, the printed board P is long in the transport direction. Since the fixed chute 6A and the movable chute 6B do not protrude outward (rightward) from the right end at the right end, they are once transported from the left to the right by the substrate transport conveyor, and then moved from right to left. The left end of the printed circuit board P comes into contact with the stopper 7B and is locked.

  As described above, the screen recognition mark attached to the screen 1 by the screen recognition camera while the printed board P is supported by the fixed chute 6A and the movable chute 6B (see FIG. 3C). And the board recognition mark attached to the printed circuit board P is imaged by the board recognition camera 8 moved to the upper position of the printed circuit board P, and the recognition processing device recognizes these images, and the control device performs both processing. The recognition process result is sent out. Then, in the control device, based on the recognition processing result, the position shift amount that should relatively position the position of each substrate recognition mark and the position of each screen recognition mark is calculated, and the calculation result is stored in the RAM. Based on the amount of misalignment, the control device controls the X-axis drive motor and table θ-axis drive motor of the substrate support unit, and controls the Y-axis drive motor of the screen 1, so that the relative relationship between the printed circuit board P and the screen 1 is controlled. Correct the misalignment.

  Then, the substrate recognition camera 8 is further retracted and the substrate support unit is lifted to bring the printed circuit board P supported by the support pins into close contact with the lower surface of the screen 1 (see FIG. 3D), and the stopper 7B is The squeegee 5B is moved down from the conveyance path, the squeegee 5B is lowered, and the moving mechanism is driven to move the squeegees 5A and 5B to the front of the screen printing machine (from right to left, see FIG. 3E). The solder paste HP is printed on the large print area PAA1 of the printed circuit board P through the print pattern hole of the large print pattern area PA1 of the screen 1 (see FIGS. 5 and 3E).

  Next, when printing on the large printing area PAA1 is completed, all printing on the printed circuit board P is completed, so that the substrate support unit is lowered and conveyed to be discharged to the downstream apparatus by the substrate conveyance conveyor.

  Then, the printed board P on which the next (second) printed board P is inherited from the upstream side is conveyed from the left to the right by the board conveying conveyor, and the right end of the printed board P is placed on the stopper 7A appearing in the conveying path. Are abutted, locked, and positioned.

  Then, the fixed chute 6A and the movable chute 6B sandwich the printed board P from the side, and as shown in FIG. 6 (F), the squeegee 5B is lifted and moved to the front position of the screen printing machine by the moving mechanism. 5B is moved. Further, the substrate recognition camera 8 moves to a position above the printed circuit board P and the small print pattern area PA2 on the screen 1 is positioned above the small print area PAA2 on the printed circuit board P (right side in FIG. 6F). Direction) by the moving mechanism.

  The screen recognition mark attached to the screen 1 is imaged by the screen recognition camera while the printed board P is supported by the fixed chute 6A and the movable chute 6B sandwiched from the side, and the board recognition camera 8 captures the image. The board recognition mark attached to the printed circuit board P is imaged, the recognition processing device recognizes these images, and both recognition processing results are sent to the control device. Then, in the control device, based on the recognition processing result, the position shift amount for relatively positioning the position of each substrate recognition mark and the position of each screen recognition mark is calculated, and the calculation result is stored in the built-in RAM. The control device controls the X-axis drive motor and the table θ-axis drive motor of the substrate support unit and the Y-axis drive motor of the screen 1 on the basis of the positional deviation amount. Positioning is performed by correcting the relative positional deviation.

  Then, the substrate recognition camera 8 is further retracted, the substrate support unit is raised, and the printed circuit board P supported by the support pins is brought into close contact with the lower surface of the screen 1 (see FIG. 6G), and the stopper 7A. The squeegee 5B is lowered and the moving mechanism is driven to move the squeegees 5A and 5B to the front of the screen printing machine (from right to left, see FIG. 6G). 5A prints the solder paste HP on the small print area PAA2 of the printed circuit board P through the print pattern hole of the small print pattern area PA2 of the screen 1 (see FIG. 6G).

  Next, after the printing on the small printing area PAA2 is completed, the substrate support unit is lowered, the stopper 7B appears in the substrate conveyance path, the substrate recognition camera 8 moves to a position above the printed substrate P, and the squeegee 5B is moved. In the raised state, the moving mechanism moves in the Y direction (left direction in FIG. 6) so that the large print pattern area PA1 of the screen 1 is positioned above the large print area PAA1 of the printed circuit board P. Further, the holding of the printed board P between the fixed chute 6A and the movable chute 6B is released, and the length of the printed board P in the transport direction is long. Therefore, the right end portion of the printed board P has the fixed chute 6A and the movable chute. From the state where 6B does not protrude outward (rightward) from the right end (see the lower stage in FIG. 1 and the lower stage in FIG. 2), it is once transported from the left to the right by the substrate transport conveyor, and then reversely from right to left. Therefore, the left end of the printed circuit board P is brought into contact with and locked with the stopper 7B and positioned (see the lower part of FIG. 4).

  Then, in a state where the printed board P is supported by the fixed chute 6A and the movable chute 6B, the screen recognition mark attached to the screen 1 is imaged by the screen recognition camera and the board moved to the position above the printed board P. The recognition camera 8 picks up the board recognition mark attached to the printed circuit board P, the recognition processing device recognizes these images, and sends both recognition processing results to the control device. Then, in the control device, based on the recognition processing result, the position shift amount that should relatively position the position of each substrate recognition mark and the position of each screen recognition mark is calculated, and the calculation result is stored in the RAM. Based on the amount of misalignment, the control device controls the X-axis drive motor and table θ-axis drive motor of the substrate support unit, and controls the Y-axis drive motor of the screen 1, so that the relative relationship between the printed circuit board P and the screen 1 is controlled. Correct the misalignment.

  Then, the substrate recognition camera 8 is further retracted and the substrate support unit is raised to bring the printed circuit board P supported by the support pins into close contact with the lower surface of the screen 1, and the squeegee 5A is lowered to drive the moving mechanism. The squeegees 5A and 5B are moved rearward (from left to right) of the screen printing machine, and the squeegee 5B causes the solder paste HP to be transferred to the large printed circuit board P through the printed pattern holes in the large printed pattern area PA1 on the screen 1. Printing is performed on the print area PAA1 (see FIG. 6H).

  Next, when printing on the large printing area PAA1 is finished, all printing on the printed board P is finished, so the board support unit is lowered and conveyed to be discharged to the downstream apparatus by the board conveying conveyor, and Then, the printing operation is shifted to the third sheet so that the state shown in FIG. That is, as described above, the printing operation is repeated so as to return to the initial state every time two printed boards P are printed.

  Then, by printing a small print area PAA2 and a large print area PAA1 on the printed circuit board P, printing can be performed on the printed circuit board P that is long in the transport direction even with one screen 1, without changing the screen size. It can also be printed on large printed circuit boards.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various embodiments described above without departing from the spirit of the present invention. It encompasses alternatives, modifications or variations.

1 Screen P Printed Circuit Board 5A, 5B Squeegee HP Solder Paste PA2 Large Print Pattern Area PA2 Small Print Pattern Area PAA2 Large Print Area PAA2 Small Print Area 6A Fixed Chute 6B Movable Chute

Claims (4)

  In a printing method in a screen printing machine that includes a pair of squeegees and applies a coating agent by moving one of the squeegees onto the printed circuit board, the printed circuit board is divided into two parts, and each is printed separately by a separate squeegee. A printing method in a screen printer, characterized in that   In a printing method in a screen printing machine that includes a pair of squeegees and applies a coating agent by moving one of the squeegees on a printed circuit board that has been transported from upstream and positioned, a printed circuit board that is long in the transport direction is A printing method in a screen printing machine, characterized in that printing is performed separately by using a separate squeegee for each.   The printing method of the screen printing machine according to claim 2, wherein a moving direction of the squeegee is orthogonal to a conveying direction of the printed board, and a length of the printed board in the conveying direction is longer than a length of the squeegee.   In a printing method in a screen printing machine that includes a pair of squeegees and applies a coating agent by moving one of the squeegees onto a printed circuit board, a printed circuit board that is long in the transport direction is divided into two parts in the transport direction. A printing method in a screen printing machine, wherein printing is performed on one area with one squeegee on the basis of one side and on the other area with the other squeegee on the other side.

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