JP3573608B2 - Screen printing machine and screen printing method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screen printing machine. In particular, the present invention relates to an invention for accurately positioning a work on a table.
[0002]
[Prior art]
FIG. 4 is a schematic view of a conventional screen printing machine.
FIG. 5 is a front view of the screen printing machine.
FIG. 6 is a plan view of the screen printing machine.
[0003]
The screen printing machine 101 includes a base 102. The base 102 has a table 103 and a printing unit 109 mounted thereon. The table 103 is attached along the base 102 so as to be movable in the directions of arrows K1 and K2. The table 103 places a work 110 (for example, a substrate) and moves the work 110 to the printing unit 109. The printing unit 109 performs printing on the work 110. The operation box 105 is provided on a side surface of the base 102 and includes various switches 106 used by an operator. The base 102 further includes a camera 190. An image of the work 110 placed on the table 103 is captured by the camera 190, and accurate positioning of the work is performed. The table 103 is a table capable of performing positioning in the three-dimensional directions of X, Y, and θ.
In the printing unit 109, the screen plate making 200 is attached to the printer base 108. The screen plate making 200 includes a screen frame 211 and a screen mesh 201 having a print image. The stroke section 116 is movably attached to the printer base 108.
The printer base 108 controls the movement of the stroke unit 116, and while the squeegee 111 applies a printing pressure suitable for screen printing to the screen mesh 201, along the surface of the screen mesh 201 at a speed suitable for screen printing, an arrow C1. , C2.
[0004]
7 and 8 are flowcharts showing the printing operation of the conventional screen printing machine.
The screen plate 200 is provided in advance with a pattern for printing a printing alignment mark as one of the print images. First, in S1, a dummy work is mounted on the table 103, and a print image including a pattern for printing a print alignment mark is printed on the dummy work. Next, in S2, the table 103 is moved below the camera 190, and the position of the printed alignment mark is read and stored.
[0005]
FIG. 8 is a flowchart illustrating an operation of performing printing on the actual work 110.
In S3, the work 110 is mounted on the table 103. In S14, a printing alignment mark provided in advance on the work is read. In S15, the position of the printing alignment mark on the screen already stored is compared with the position of the printing alignment mark on the work read in S14, and the table 103 is positioned in the X, Y, and θ directions. In S16, the table is moved to a position immediately below the screen. In S17, printing is performed on the work. In S18, the table is restored. In S19, the work is unloaded.
By repeating the steps S3 to S19, screen printing is continuously performed on a plurality of works.
[0006]
[Problems to be solved by the invention]
Since the conventional screen printer operates as described above, the work is positioned by adjusting the position of the table in the X, Y, and θ directions. If the work is placed on the table outside the range in which the table can be positioned in the X, Y, and θ directions, the work must be moved on the table surface. However, if the work is made of a flexible material or easily bendable as shown in FIG. 9, moving the work on the table surface will cause the work to undulate, and printing will not be accurate. There was a problem that could not be performed. In addition, if an adhesive tape for adhering the work or a suction suction device for suctioning the work is provided on the table surface, once the work is placed on the table, the position of the work on the table surface can be easily adjusted. Cannot be shifted.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a screen printer capable of mounting a work on a table at a correct position.
[0008]
Particularly, it is an object of the present invention to provide a screen printing machine that does not require the work to be shifted on the table surface when the work is easily deformed or wavy, such as a thin plastic substrate or a thin dielectric sheet. Aim.
[0009]
[Means for Solving the Problems]
The screen printing machine according to the present invention, a storage unit that stores the position of the printing alignment mark,
A work loading section for loading the work above the table,
A camera for reading the position of the table mounting alignment mark of the work loaded by the work loading unit;
A first table positioning unit that positions the table based on the position of the table mounting alignment mark read by the camera;
A work mounting unit for mounting the work on the table positioned by the first table positioning unit;
A second table positioning unit that positions the table based on the position of the printing alignment mark stored in the storage unit;
A printing unit for printing on a work mounted on the table positioned by the second table positioning unit.
[0010]
The work mounting section mounts the work on the table from a direction perpendicular to the table surface.
[0011]
A screen printing method according to the present invention includes a storage step of storing a position of a printing alignment mark,
A work loading process for loading the work above the table,
A camera for reading the position of the table mounting alignment mark of the work loaded in the work loading process;
A first table positioning step of positioning the table based on the position of the table mounting alignment mark read by the camera;
A work mounting step of mounting the work on the table positioned in the first table positioning step;
A second table positioning step of positioning the table based on the position of the printing alignment mark stored in the storage step;
A printing step of printing on a work mounted on the table positioned in the second table positioning step.
[0012]
In the work mounting step, the work is mounted on the table from a direction perpendicular to the table surface.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a perspective view of a work 110, a camera 190, and a table 103 according to the present invention.
FIG. 2 is a schematic side view when the work 110 is mounted on the table 103.
It is assumed that the work 110 has a printing alignment mark 91 and a table mounting alignment mark 92 printed thereon in advance. The work 110 has a positioning hole 93. On the other hand, the table 103 is provided with positioning pins 94. The positioning holes 93 are fitted into positioning pins 94. The positioning hole 93 and the positioning pin 94 are one structural example in the case where the work 110 cannot be displaced along the surface of the table 103 after mounting when the work 110 is mounted on the table 103. 94 is not necessary for the present invention. Instead of the positioning holes 93 and the positioning pins 94, an adhesive tape or another work mounting jig may be provided. Also, it is not necessary. An X table 95, a Y table 96, and a θ table 97 are provided below the table 103, and the table 103 can be positioned in the X, Y, and θ directions, respectively.
[0014]
As shown in FIG. 2, the work loading section (and the work mounting section) 80 includes a suction pad 81, a cylinder 82, a guide rail 83, and a load section 84. The suction pad 81 suctions the work 110. The cylinder 82 mainly operates as a work mounting section, and moves the suction pad 81 up and down in the directions of arrows C and D. The guide rail 83 mainly operates as a work loading section, and horizontally moves the load section 84 in the directions of arrows A and B. Since the cylinder 82 is fixed to the load portion 84, the work 110 is carried along the guide rail 83 in a horizontal direction above the table 103.
[0015]
The control unit 70 shown in FIG. 2 includes a storage unit 50, a first table positioning unit 61, a second table positioning unit 62, and other control units not shown. The controller 70 can be realized by a central processing unit, a program, and an input / output port. The operation of the control unit 70 will be described with reference to the flowchart shown in FIG.
The flowchart of FIG. 3 starts when the power of the screen printing machine is turned on and printing on the dummy work is completed. First, in S9, the table 103 is moved to a table origin position, which is a reference position for mounting the work 110, and the table origin position is stored in the storage unit 50.
Next, in S10, the work 110 is loaded into the space above the table 103 by the work loading unit 80 and positioned. The positioning by the work loading section 80 is not accurate, and it is sufficient to simply move the work 110 in the horizontal direction and stop it. Next, in S11, the table 190 is used to read the table mounting alignment mark 92 using the camera 190. Next, in S12, the table 103 is positioned in the X, Y, and θ directions based on the table origin position stored in S9 and the position of the table mounting alignment mark 92 read in S11. This operation is performed by the first table positioning unit 61. It is assumed that the first table positioning unit 61 knows the positional relationship between the table origin position and the positioning pins 94 in advance. It is also assumed that the first table positioning unit 61 knows the positional relationship between the table mounting alignment mark 92 and the positioning hole 93 in advance. Therefore, the first table positioning unit 61 can adjust the position of the table so that the positions of the positioning holes 93 and the positioning pins 94 match by knowing the table origin position and the table mounting alignment mark 92.
[0016]
Next, in step S13, the work pad 110 is mounted on the table surface by lowering the suction pad 81 using the cylinder 82. That is, the work 110 is accurately mounted on the table 103 such that the positions of the positioning holes 93 and the positioning pins 94 match. Next, in S14, the printing alignment mark 91 of the work 110 is read. As described with reference to FIG. 7, it is assumed that the position of the printing alignment mark of the screen plate 200 is stored in the storage unit 50 in advance by printing on the dummy work. The second table positioning unit 62 calculates the position correction amount of the table 103 from the position of the printing alignment mark stored in the storage unit 50 and the position of the printing alignment mark 91 of the work read in S14. Positioning in the X, Y, and θ directions is performed. The operations from S15 to S19 in FIG. 3 are the same as the operations from S15 to S19 in FIG. 8 described as a conventional example.
[0017]
In reading the table mounting alignment mark 92 and the printing alignment mark 91 in S11 and S14 described above, the camera 190 does not physically move in the horizontal direction at all. For example, if the camera 190 can physically measure the length in the range of 1 cm without physically moving the position, the printing alignment mark 91 and the table mounting alignment mark 92 are printed close to each other in the range of 1 cm. In this case, the printing alignment mark 91 and the table mounting alignment mark 92 can be read without moving the camera 190.
Alternatively, the camera 190 may be moved. In the case shown in FIG. 1, four cameras 190 are shown. However, two cameras 190 are prepared, and the cameras 190 are moved so that four printing alignment marks 91 or four table mounting alignment marks 92 are provided. May be measured. Alternatively, two or four printing alignment marks 91 or two or four table mounting alignment marks 92 may be measured by one camera 190.
[0018]
When the conventional work 110 is mounted on the table 103, the table 103 is not moved, but in the present invention, the position of the work 110 is read from a table mounting alignment mark 92 provided in advance on the work 110, and A major feature is that the table 103 is moved in the X, Y, and θ directions by the one table positioning unit 61 so as to match the position of the work 110. Therefore, even if the loading position of the workpiece 110 by the workpiece loading section 80 is rough, the table 103 performs high-precision positioning in the X, Y, and θ directions. Mounted on
Further, the first table positioning section 61 can be realized by a program, and does not require any special parts for the first table positioning section 61.
[0019]
As in this embodiment, after the work 110 is mounted on the table 103 by being vertically mounted on the table surface of the table 103 and by being lowered to an accurate position, the work There is no need to shift 110 on the surface of table 103. Therefore, even when the work 110 is made of a soft material or a thin material, there is no danger that the surface of the work 110 will be wavy or bent.
Further, in this embodiment, a large number of suction pads 81 are arranged around the work 110 so that even when the work 110 is made of a soft material or a thin material, the suction pad 81 is not loaded when the work 110 is carried in. This eliminates the danger that the surface of the work 110 is wavy or bent.
[0020]
In this embodiment, the case where the printing alignment mark 91 and the table mounting alignment mark 92 are separately provided on the work 110 has been described. They may be the same and may be used alternately. In addition, although the case where the printing alignment mark 91 and the table mounting alignment mark 92 are respectively provided at four positions is shown, at least two of the printing alignment mark 91 and the table mounting alignment mark 92 may be present.
Further, the camera of the present invention may be any camera as long as the alignment mark can be read.
[0021]
【The invention's effect】
As described above, according to the present invention, the work 110 can be positioned and mounted on the table 103 with high accuracy. Therefore, it is not necessary to shift the work 110 on the surface of the table 103 after the work 110 is mounted, and it is possible to prevent the work 110 from being twisted, bent, or wavy.
[0022]
Further, according to the present invention, the work is mounted by moving the table 103 using the X, Y, and θ tables provided in advance, so that the positioning accuracy of the work loading section 80 for loading the workpiece with respect to the workpiece 110 is improved. The workpiece can be made rough, and the production design of the work loading section 80 can be easily performed.
[0023]
Further, according to the present invention, a mechanism for shifting the position of the work 110 on the table surface after mounting the work 110 on the table 103 is conventionally required. This has the effect that the mechanism described above is completely unnecessary.
[Brief description of the drawings]
FIG. 1 is a perspective view of a work 110 and a table 103 according to the present invention.
FIG. 2 is a side view when the work 110 of the present invention is mounted on a table 103.
FIG. 3 is a flowchart showing the operation of the control unit 70 of the present invention.
FIG. 4 is a perspective view showing a conventional screen printing machine.
FIG. 5 is a side view of a conventional screen printing machine.
FIG. 6 is a plan view of a conventional screen printing machine.
FIG. 7 is a flowchart showing the operation of a conventional screen printing machine.
FIG. 8 is a flowchart illustrating the operation of a conventional screen printing machine.
FIG. 9 is a diagram showing a problem when a conventional screen printing machine mounts a work.
[Explanation of symbols]
50 storage unit, 61 first table positioning unit, 62 second table positioning unit, 70 control unit, 80 work loading unit, 81 suction pad, 82 cylinder, 83 guide rail, 84 loading unit, 91 alignment mark for printing, 92 Alignment mark for mounting table, 93 positioning hole, 94 positioning pin, 95 X table, 96 Y table, 97 θ table, 103 table, 110 work, 190 camera, 200 screen plate making.

Claims (6)

And the workpiece loading part for loading the work to people on the table,
A camera for reading the position of the table mounting alignment mark of the work loaded by the work loading unit;
A first table positioning unit that positions the table based on the position of the table mounting alignment mark read by the camera;
Screen printing machine, characterized in that it comprises a workpiece mounting portion <br/> for mounting a workpiece on a table that is positioned by the first table positioning part. The screen printing machine further comprises:
A storage unit for storing the position of the printing plate alignment mark,
A second table positioning unit that positions the table based on the position of the screen plate printing alignment mark stored in the storage unit;
2. The screen printing machine according to claim 1, further comprising: a printing unit that prints on a work mounted on the table positioned by the second table positioning unit. The screen printing machine according to claim 1, wherein the work mounting section mounts the work on the table from a direction perpendicular to the table surface. And the workpiece loading process to load the work to people on the table,
A reading step of reading the position of the table mounting alignment mark of the work loaded in the work loading step;
A first table positioning step of positioning the table based on the position of the table mounting alignment mark read in the reading step ;
Screen printing method characterized by comprising a workpiece mounting step the <br/> mounting a workpiece on a table that is positioned from the first table positioning step. The screen printing method further comprises:
A storage step of storing the position of the screen alignment mark for printing,
A second table positioning step of positioning the table based on the positions of the screen alignment printing alignment marks stored in the storage step;
A printing step of printing on a work mounted on the table positioned in the second table positioning step;
The screen printing method according to claim 4, further comprising: 5. The screen printing method according to claim 4 , wherein in the work mounting step, the work is mounted on the table from a direction perpendicular to the table surface.

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