JPH03187747A - Alignment in screen printing machine - Google Patents

Abstract

PURPOSE:To make disorder not to be generated in aligment of a work even though an alignment hole of a plate is deformed due to a printing material by a method wherein after a charge coupled device camera recognizes an alignment hole of a plate, the alignment of the work is performed based on a recognized position of the charge-coupled device camera. CONSTITUTION:When a plate 12 is exchanged, after reading an alignment hole 14 of a new plate with a charge-coupled device camera 11 at a position for alignment A, the plate 12 is moved by a specified distance from this position for alignment A to a printing operation position B. Thereafter, alignment is performed to each work 14 to be supplied to the position for alignment A with the charge-coupled device camera 11 recognizing an alignment hole reading position of the plate 12 and a work correction table 28. When the work 14 thus indirectly aligned is moved by the specified distance to be sent to the printing operation position B, accurate alignment at the position for alignment A is reproduced as it is at this printing operation position B.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a method for applying printing materials such as ink or paste (for example, thick film forming material or cream solder) to a workpiece through the apertures of a plate. The present invention relates to an alignment method in a screen printing machine for printing.

(Prior Art) In a conventional screen printing machine having an automatic plate alignment function, as shown in FIG.
(Charge coupled device camera...CO
(referred to as D camera), the alignment hole of plate 12! 3, an alignment mark 15 on a workpiece (substrate) 14 is recognized, and a positional deviation 16 between the plate 12 and the workpiece 14 is corrected.

This conventional alignment method is carried out at the printing operation position, and after aligning the plate 12 and the workpiece 14 as described above and printing, the same plate 12 and the next sequentially supplied workpiece 14 are aligned in the same manner. I am trying to print by aligning it with the . That is, positioning and printing are repeatedly performed between one plate 12 and a plurality of works 14.

(Problem to be Solved by the Invention) Conventionally, since the alignment holes 13 of the plate 12 are within the printing range, as shown in FIG. If the printing material I7 such as paste adheres, there is a possibility that the position of the alignment hole 13 recognized by the CCD camera 11 may shift.

For this reason, the conventional method of repeatedly directly aligning the plate 12 and the work 14 for each work using the alignment hole 13 of the plate 12 at the printing operation position has a fundamental problem of positional deviation.

The present invention has been made in view of the above points, and is a method for aligning a plate of a screen printing machine and a workpiece using a charge-coupled device camera. The purpose of this is to ensure accurate alignment between the two.

[Output of the invention] (Means for solving the problem) The present invention detects the positional deviation between the alignment hole 13 of the plate 12 and the alignment mark 15 of the workpiece 14 using a charge-coupled device camera 11, and In the alignment method in a screen printing machine that corrects the position between the plate 12 and the workpiece 14, the plate 12 is supplied to the alignment position A provided below the charge-coupled device camera 11, and the alignment hole 13 of the plate 12 is
After reading the position of the plate 12 with the charge-coupled device camera 11, the plate 12 is moved a predetermined distance to the printing operation position B and kept on standby.Then, the workpiece 14 is fed under the same charge-coupled device camera 11. Then, the position of the alignment mark 15 on the workpiece 14 is read by the charge-coupled device camera 11, and the positional deviation of the alignment mark position on the workpiece 14 is detected by the charge-coupled device camera 11 based on the alignment hole reading position of the plate 12. detecting and driving the workpiece correction table 28 based on the positional deviation signal output from the charge-coupled device camera 11;
This is a positioning method in which the workpiece 14 on the workpiece correction table is automatically aligned, and then the workpiece 14 is moved by a predetermined distance to the printing operation position B.

(Function) The present invention provides alignment position fll when the plate 12 is replaced.
At A, once the alignment hole 13 of the new plate 12 is read by the charge-coupled device camera 11, the plate 12 is moved from this alignment position A to the printing operation position B by a predetermined distance, and then the position of the plate 12 is determined. The position of each workpiece 14 supplied to the alignment position A is adjusted by the charge-coupled device camera 11 that recognizes the alignment hole reading position and the workpiece correction table 28. Then, the workpiece 14 that has been indirectly aligned in this way is moved by a predetermined distance to the printing operation position 1i! When feeding to position B, the accurate alignment at alignment position A is reproduced as is at this printing operation position B.

(Example) Hereinafter, the present invention will be explained in detail with reference to an example shown in FIG. Note that the same reference numerals are used for the same parts as in FIG. 2.

A pair of upper guide rails 21 and a pair of lower guide rails 22 are arranged in parallel. These guide rails 21, 22 are provided with an alignment position 11IA set by the right-hand side stoppers 23, 24, and a printing operation position 1i1B set by the left-hand side stoppers 25, 26, respectively.

The upper guide rail 21 has stoppers 23°25 at both ends.
A moving table 27 is slidably fitted to the lower guide rail 22, and a workpiece correction table 28 is slidably fitted to the lower guide rail 22. There is.

The moving table 27 and the workpiece correction table 28 are reciprocated by a feeding mechanism (not shown, for example, a ball screw rotated by a reversible motor, a fluid pressure cylinder, etc.), and the stoppers 23, 24, 25.
26 for positioning.

The moving table 27 is provided with a plurality of pins 32 and an air cylinder 33 for positioning the screen printing plate 12 in the hollow body 31, and is further provided with a plurality of clamps 34 for fixing the plate 12. There is. Then,
The plate 12 is pressed against the bottle 32 using an air cylinder 33 to position it, and the clamp 34 is pulled down using an air cylinder (not shown) to fix the plate 12 onto the hollow body 31. In edition 12,
Openings for imprinting printing materials such as ink and paste (
A pair of alignment holes 13 are bored outside the slit 35.

The workpiece correction table 28 adjusts the workpiece (printed wiring board) 14 in the X direction, Y direction, and O direction (rotation direction).
This is a movable correction device. Further, the workpiece correction table 28 includes the alignment position 11A and the printing operation position [B
Also provided is a mechanism for raising and lowering the workpiece 14 whose movement has been corrected in two directions. In addition to the pattern 36, the workpiece 14 is provided with a pair of alignment marks 15 corresponding to the alignment holes 13 of the plate 12.

For alignment position [A, a pair of charge-coupled device cameras 11
(Charge coupled device camera...CC
(referred to as D camera 11) is arranged.

The mounting position of this CCD camera 11 is provided so as to be adjustable in the X direction and the Y direction.

The printing operation position fiB is the squeegee 41 of the screen printing machine.
is the position where it moves back and forth. This squeegee 41 is reciprocated along a guide rod 42 by a ball screw or the like rotated by a reversible motor (not shown). Since the guide rod 42 itself is also moved up and down, the squeegee 41 can move the plate 12.
It is similar to a general screen printing machine in that it can move toward and away from the screen.

Note that in the drawings, for convenience, the areas between the upper guide rail 21 and the lower guide rail 22, and between the upper guide rail 21 and C
Although the distance between the CD camera 11 or the squeegee 41 is too far, it goes without saying that the output is actually close to the CD camera 11 or the squeegee 41.

Next, the operation of this embodiment will be explained.

The movable base 27 is stopped by a stopper 23 at a position below the CCD camera 11 that has been positioned in advance (alignment position IA).
After setting the plate 12 on the plate 12 and reading the position of the alignment hole 13 of the plate 12 with the CCD camera 11, the plate 12 is moved by the moving table 27 from the stopper 23 at the alignment position 11A to the stopper 25 at the printing operation position B. The robot moves a predetermined distance and waits. This plate 12 is fixed at this printing operation position B until it is replaced with another plate 12.

Then, the workpiece 14 is supplied onto the workpiece correction table 28 which is stopped by the stopper 24 at the lower position (alignment position 11A) of the same CCD camera 11.
The position of the alignment mark 15 is read by the CCD camera 11, and the CCD camera 11 detects the positional deviation of the alignment mark position of the workpiece 14 based on the alignment hole reading position of the plate I2, and the CCD camera 11 outputs the detected position. The workpiece correction table 28 is driven in the X, Y, or θ direction based on the positional deviation signal generated, and the alignment mark position of the workpiece 14 on the workpiece correction table 28 is aligned with the alignment hole reading position of the plate 12. .

Then, the workpiece 14 is lowered, the workpiece correction table 28 is moved a predetermined distance from the stopper 24 at the alignment position 11A to the stopper 26 at the printing operation position 11B, and the workpiece 14 is moved to the printing operation position [B]. If you let
Since the accurate alignment at the alignment position 11A is directly reproduced at this printing operation position 111B, the workpiece 14 is raised to the lower surface of the plate 12 in the standby state at this point flIB, and
Printing is performed using a squeegee 41.

The alignment of the workpieces 14 at the alignment position 11A is performed for a plurality of workpieces 14 until the plate 12 is replaced.

[Effects of the Invention] According to the present invention, once the charge-coupled device camera recognizes the alignment hole of the plate, the workpiece is then aligned based on the recognized position of the charge-coupled device camera. Even if the alignment hole of the plate is deformed by the printing material, the alignment of the workpiece will not be misaligned.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the alignment method in a screen printing machine of the present invention, Fig. 2 is a perspective view showing a conventional alignment method, and Fig. 3 is a plan view showing an enlarged view of the alignment holes in the plate. It is a diagram. 11. Charge coupled device camera (CCD camera), 12.
- Plate, 13... Alignment hole, 14... Workpiece, 15...
Alignment mark, 28...Work correction table, A...
Alignment position, B...Printing operation position. Kansui U

Claims (1)

[Claims] (1) In an alignment method for a screen printing machine in which a charge-coupled device camera detects misalignment between alignment holes on the plate and alignment marks on the workpiece, and corrects the position between the plate and the workpiece, charge coupling is used. A plate is supplied to the alignment position provided below the device camera, the position of the alignment hole in the plate is read by the charge-coupled device camera, and the plate is moved a predetermined distance to the printing operation position and then placed on standby. , a workpiece is fed below the same charge-coupled device camera, the position of the alignment mark on the workpiece is read by the charge-coupled device camera, and the workpiece is positioned based on the alignment hole read position of the plate by this charge-coupled device camera. Detects the positional deviation of the alignment mark position, drives the workpiece correction table based on the positional deviation signal output from the charge-coupled device camera, automatically aligns the workpiece on this workpiece correction table, and moves the workpiece to the printing operation position. A method for aligning a screen printing machine by moving it a predetermined distance.