JP3337764B2 - Screen printing method and screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a screen printing method and a screen printing machine to print the cream solder on the board.

[0002]

2. Description of the Related Art In recent years, in the field of circuit formation, screen printing using cream solder has become mainstream. An example of a conventional screen printing method will be described with reference to FIGS.

In FIGS. 5 (a) and 5 (b), reference numeral 1 denotes a stage for regulating the printed circuit board 2, reference numeral 3 denotes a screen mounted on the printed circuit board 2 during printing, and reference numeral 4 denotes a print head 5.
A squeegee 6 attached to the squeegee (see FIG. 7) is cream solder.

FIGS. 6 (a) and 6 (b) are a perspective view and a plan view, respectively, showing the stage unit 1. The stage unit 1 has a reference rail 7 fixed at a predetermined position and a position in the direction of arrow a. An adjustment rail 8 that can be adjusted is provided.
Reference numeral 4a denotes a center portion of the squeegee 4 in the width direction.

As shown in FIG. 7, the print head 5 is provided with a squeegee parallelism adjusting micrometer 9 for adjusting the parallelism between the squeegee 4 and the reference rail 7 or the adjusting rail 8 using a thickness gauge. Have been. Squeegee 4
Is held in the posture adjusted by the squeegee parallelism adjusting micrometer 9.

[0006] The operation steps from setup change to printing in the printing machine configured as described above will be described with reference to FIGS. 8 and 9. First, in the stage section 1, the position of the adjustment rail 8 is adjusted in accordance with the size of the printed circuit board 2 in the Y direction (see (a) of FIG. 6) (step # 11). The squeegee 4 is lowered to the stage 1 and the parallelism between the squeegee 4 and the reference rail 7 and the adjusting rail 8 is adjusted by the squeegee parallelism adjusting micrometer 9 (step # 12).

When the adjustment is completed, screen printing is actually performed. In the printing operation, as shown in FIG. 9, in the printing unit, the loaded printed circuit board 2 is fixed on the stage unit 1 (step # 21), and in this state, the stage unit 1 is moved to a predetermined position and raised. (Step # 22)
Then, while lowering the squeegee 4 and pressing it against the screen 3, the squeegee 4 is moved rightward or leftward,
The cream solder 6 is printed on the printed circuit board 2 (Step # 23). After that, the printed circuit board 2 is carried out to the next process location (Step # 24), and the stage section 1 is returned to the original position (Step # 25).

[0008] Cream solder 6 on printed circuit board 2 after printing
Is not printed at a certain height, the squeegee parallelism is readjusted by the parallelism adjusting micrometer 9,
Test printing is performed until the thickness of the cream solder 6 on the pattern of the printed board 2 becomes constant (step # 13).

[0009] When an optimum printing state is obtained by this test printing, production is started (step # 14).

[0010]

However, in the above-described conventional configuration, since the squeegee 4 is fixed in a predetermined posture, the parallelism adjustment that requires time and labor for setup change every time the size of the printed circuit board 2 changes. Or, a trial print had to be performed.

[0011] The present invention is intended to solve the above problems, aims to provide a screen printing method and a screen <br/> printing machine capable of printing without taking the trouble even if the size of the board is changed It is assumed that.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a reference rail fixed to a predetermined position and a base rail.
It has an adjustment rail that can adjust the position according to the width of the plate.
The board is fixed, and a screen is brought into contact with the board,
While pressing a squeegee against the screen,
A screen printing method for printing cream solder on the substrate is moved parallel to the Lumpur, and swingable fulcrum central <br/> width direction of the squeegee a squeegee, the central portion of the squeegee Intermediate position between the reference rail and the adjustment rail
Position the squeegee against the screen.
That want the is moved parallel to the reference rail for printing
Features .

[0013] The present invention also relates to a fixed position.
Adjustable position according to the width of the reference rail and the board
A stage for regulating the board with a conditioning rail;
A screen to be brought into contact with the substrate;
A squeegee that moves in parallel with the reference rail and prints cream solder on the board.
Screen printing machine, the position of a squeegee in the width direction of the substrate.
A moving mechanism for moving and adjusting the location of the squeegee was swingable fulcrum center portion in the width direction of the squeegee a squeegee structure
And the center of the squeegee is moved by the moving mechanism.
Positioned between the reference rail and the adjustment rail
Then, press the squeegee against the screen while pressing
Control means for performing printing while moving in parallel with the rule .

[0014]

By the action above the screen printing method and a screen <br/> printing machine, since the pivotably to support the center portion in the width direction as a fulcrum squeegee, squeegee along well in screen on the base plate The height of the cream solder is equal to the height of the screen and is constant. Also, the central portion of the squeegee for is made to coincide with the width direction of the center of the board, it can be made uniform over the width direction pressing force to that by the squeegee board side.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to the following. FIG. 1 is a perspective view of a print head of a printing press according to an embodiment of the present invention. The difference between this print head 10 and the conventional print head 5 shown in FIG.
A movement mechanism 1 including a ball screw 11 and a motor 12 so that the squeegee 4 can move in the width direction Y so that the squeegee 4 can move in the width direction Y;
3 is provided. Each unit of the printing press, including the print head 10 and the moving mechanism 13, operates under the control of a control unit (not shown). Note that components having the same functions as those of the conventional printing press are denoted by the same reference numerals,
Description of the same components will be omitted.

FIG. 4 shows a flowchart of a solder printing method at the time of setup change by this printing machine. First, FIG.
The position of the adjustment rail 8 is adjusted from the size A (see FIG. 2) in the width direction (Y direction) of the printed circuit board 2 in the stage unit 1 as shown in FIG. Next, the substrate size A is input as data (step # 2). As shown in FIG. 2, since the distance D from the squeegee origin E to the reference rail 7 is constant, a value that is half the size A of the printed circuit board 2 in the Y direction is subtracted from the base stroke (distance D). Then, the squeegee 4 is moved in the width direction Y by the ball screw 11 and the motor 12 for positioning (step # 3). In addition, B in FIG. 2 is a movement adjustment direction of the adjustment rail 8.

As a result, as shown in FIG. 3, even if the rail width (the distance between the reference rail 7 and the adjustment rail 8) changes, the center 4a of the squeegee 4 remains at the center of the rail width, ie, Since it is always located at the center of the printed circuit board 2 in the Y direction, center printing becomes possible. Therefore, by supporting the squeegee 4 at its center 4a as shown in FIG. 1, the squeegee 4 follows the screen 3 (see FIG. 5A) on the printed board 2 and the squeegee 4 Can be made uniform in the width direction. As a result, when the cream solder is printed (step # 4), the height of the cream solder becomes the height of the thickness of the screen 3 and is uniformly stabilized. In addition, there is no need for a complicated adjustment and a test print at the time of the setup change as in the related art.

[0018]

As it is evident from the foregoing description, according to the present invention, as well as movable along the squeegee in the width direction with respect to the base plate, freely squeegee swinging center portion in the width direction as a fulcrum is supported, by printing by moving so as to coincide with the center in the width direction of the base plate the central portion of the squeegee, adjustment and during setup recombinant consuming conventional such effort,
The cream solder can be printed well and efficiently at a certain height without the need for test printing.

[Brief description of the drawings]

FIG. 1 is a perspective view and a main part side view of a print head of a printing press according to an embodiment of the present invention.

FIG. 2 is a schematic side view related to squeegee positioning of the printing press.

FIG. 3 is a plan view schematically showing operations of positioning a rail width of a stage portion and a center of a squeegee when a substrate size is changed.

FIG. 4 is a flowchart at the time of setup change of a solder printing method according to an embodiment of the present invention.

5A and 5B are a plan view and a front view of a printing press.

6 (a) and 6 (b) are perspective views of a printing press and plan views schematically showing a conventional solder printing method.

FIG. 7 is a perspective view of a print head of a conventional printing press.

FIG. 8 is a flowchart at the time of setup change of a conventional solder printing method.

FIG. 9 is a flowchart of a solder printing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stage part 2 Printed circuit board 3 Screen 4 Squeegee 4a Central part of squeegee 6 Cream solder 7 Reference rail 8 Adjustment rail 10 Print head 13 Moving mechanism

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H05K 3/34 B41F 15/08 B41F 15/40 H05K 3/12

Claims (2)

(57) [Claims] A reference rail fixed at a predetermined position;
Adjustment rails that can adjust the position according to the width of the board
Prepare the substrate and touch the screen to the substrate
While pressing a squeegee against the screen.
A screen printing method for indicia <br/> printing a cream solder on the substrate is moved in parallel and quasi rails and swingable fulcrum center portion in the width direction of the squeegee a squeegee, the central portion of the squeegee Adjust with the reference rail
After positioning the squeegee at an intermediate position with the
Moves parallel to the reference rail while pressing cleanly
Screen printing method to print by letting it print. A reference rail fixed at a predetermined position;
Adjustment rails that can adjust the position according to the width of the board
A stage section for regulating the substrate provided, and
Screen and press it against the screen
Move it in parallel with the reference rail and apply cream solder to the board.
And a squeegee for printing the squeegee , wherein the movement of the squeegee in the width direction of the substrate is adjusted.
A mechanism, a squeegee structure in which the squeegee is swingable around a center in the width direction of the squeegee, and the center of the squeegee is moved by the moving mechanism to the reference rail.
Position between the tool and adjustment rail, and then
While pressing the page against the screen,
A screen printing machine provided with control means for printing by moving to a line .