JP3944299B2 - Method and apparatus for controlling plate separation in screen printing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate separation control method and apparatus for screen printing, and in particular, enables good printing with good plate separation in screen printing.
[0002]
[Prior art]
In screen printing, a screen plate is placed and fixed on a printed material such as a printed circuit board and fixed, and the squeegee device is moved in one direction on the upper surface of the screen plate so that it can be moved between the two blades of the squeegee device. A printing material such as ink is ejected and placed on the printing material through pattern holes formed on the screen by the blade, and then the pattern is formed on the printing material when the screen plate is peeled off.
[0003]
Thus, in order to obtain highly accurate screen printing, it is well known in the art that a so-called plate separation operation in which the screen plate is peeled from the printing material is important. That is, the printing material pushed into the pattern hole of the screen plate through the squeegee device is not sufficiently solidified in the pattern hole and is still in a soft state. This is because the printing material that is satisfactorily placed on the upper surface of the printed material is also kicked or scraped by the inner edge of the pattern hole, so that the pattern placed on the upper surface of the printed material changes. Therefore, it goes without saying that separation of plates requires careful work.
[0004]
Conventionally, separation of a screen plate is performed by separating the screen plate by lifting one side of the screen plate from the start point side to the end point side after the squeegee device has finished moving. Originally, it is desirable that the separation of the screen plate is lifted parallel and perpendicular to the substrate to be printed. However, the screen plate itself is made of a thin metal plate and surrounded by a frame. Therefore, even if the frame is lifted horizontally, even if the central part of the screen plate is slightly smaller than the peripheral part of the frame, it is a fact that it hangs down. End up.
[0005]
Furthermore, even if the frame is lifted horizontally, the screen plate itself has elasticity, so the central portion of the screen plate hangs down and peels off at the end. Since the entire plate flutters, the printing material mounted on the screen plate falls on the substrate to be printed as well as being kicked or scraped at the inner edge of the pattern hole as described above. Lifting horizontally was impossible in reality.
[0006]
[Problems to be solved by the invention]
Therefore, the object of the present invention is, as described above, when the screen plate is peeled off, the screen plate is peeled off at an oblique angle with respect to the printing material, so that the printing material in the pattern holes of the screen plate is removed. The object is to solve the problem of being kicked or scraped by the inner edge of the pattern hole.
[0007]
Also, since the printing material in the pattern hole after the squeegee device has finished moving tends to harden and tends to adhere to the inner peripheral wall of the pattern hole, It is to prevent the phenomenon that the pattern fades due to the adhesion.
[0008]
Further, when the pattern hole of the screen plate is smaller than the wall thickness of the screen plate, the printing material pushed into the pattern hole stops in the pattern hole when the plate is separated, and is peeled off from the printing material together with the screen plate. It is to solve the problem that screen printing may become impossible.
[0009]
In addition, regardless of the size of the pattern holes in the screen plate, when the integration density is high, there is a problem that it is difficult to separate the plate.
[0010]
SUMMARY OF THE INVENTION Accordingly, the present invention provides a plate separation control method and apparatus that enable screen printing with good printing separation and high printing accuracy.
[0011]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a plate separation control method according to claim 1, wherein the squeegee device finishes moving on the upper surface of the screen plate, and then the left and right sides facing the frame on which the screen plate is stretched. The screen plate holding members each made of a rod-like body are placed on the screen plate in such a manner that both ends thereof extend substantially at least to the front and rear opposing sides of the printed material, and the pair of screen plate holding members cover the screen plate. While pressing toward the printed material side, the frame body moves in synchronization with the substantially central portion of the screen plate at a constant speed and rises in parallel and perpendicular to the printed material at a constant speed. The screen plate is peeled from the substrate while the screen plate is always inclined at a constant angle.
[0014]
According to a second aspect of the present invention, there is provided the plate separation control device according to the second aspect , wherein the frame body on which the screen plate is stretched and the left and right opposing sides of the screen plate are placed at least in the front-to-rear direction. A screen plate holding member composed of a pair of rod-shaped bodies extending in the side, a pair of supports for supporting the screen plate holding member so as to be movable up and down, and the support members respectively along the screen plate at a constant speed. It consists of a synchronous drive mechanism fixed to the frame to be moved.
[0016]
Therefore, the plate separation operation in screen printing can achieve proper plate separation without peeling, collapse, adhesion failure, or the like of the printing material by always peeling the screen plate at a fixed angle with respect to the printing material.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a substrate 2 is placed on a base 1, and a screen plate 3 is placed on the top surface of the substrate 2 in surface contact. The screen plate 3 is stretched and fixed to a frame 4. Has been. On the upper surface of the screen plate 3 after the screen printing is finished, screen plate holding members 5 and 5 made of a pair of rods having a circular cross section are placed. The screen plate holding member 5 may be substantially the same as the inner dimension of one side 4 a of the frame 4, but at least substantially the same as the length of the left and right sides of the substrate 2 (depth direction in FIG. 1A). Have dimensions.
[0018]
Therefore, the screen plate separation control method in the first embodiment will be described. A squeegee device (not shown) moves on the upper surface of the screen plate 3 so that the printing material 2 is printed from the printing openings (pattern holes) of the screen plate 3. The screen plate restraining members 5 and 5 are placed on the upper surface near the side edge of the substrate 2 covered by the screen plate 3 in the left-right direction in which the squeegee device moves (see FIG. 1A). )reference).
[0019]
Next, the screen plate holding members 5 and 5 are moved toward each other toward the center of the screen plate 3 at a constant speed (see arrow a in FIG. 1B), and the frame body 4 is moved at a constant speed. 2 is raised vertically upward (see arrow b in FIG. 1B). The screen plate restraining member 5 may roll or may be in sliding contact without rolling.
[0020]
When the screen plate holding members 5 and 5 move to substantially the center of the substrate 2 and come into contact with each other (see FIG. 1C), one screen plate holding member 5 is located above the upper surface of the screen plate 3 ( Move to arrow c) and retreat (see FIG. 1D).
[0021]
Furthermore, the frame body 4 rises at a constant speed in a state where the other screen plate holding member 5 is stationary at a substantially central portion of the screen plate 3 (see FIG. 1E). Thus, in the steps of FIGS. 1B to 1E, the plate separation angle θ of the screen plate 3 with respect to the substrate 2 is always constant.
[0022]
Next, a second embodiment of the present invention will be described. As shown in FIG. 2, the substrate 2 is placed on the base 1, the screen plate 3 is placed on the upper surface of the substrate 2 in surface contact, and the screen plate 3 is stretched and fixed to the frame 4. Has been. A single screen plate holding member 5 having a circular cross section is placed on the upper surface of the screen plate 3 after completion of screen printing. The screen plate restraining member 5 may be substantially the same as the inner dimension of one side of the frame 4, but is at least approximately the same as the length of the left and right sides of the substrate 2 (depth direction in FIG. 2A). Have It differs from the said form that the rod-shaped body 5 is not a pair but a mere one.
[0023]
Therefore, a screen plate separation control method in the second embodiment will be described. A squeegee device (not shown) moves on the upper surface of the screen plate 3 so that the printing material 2 is printed from the printing openings (pattern holes) of the screen plate 3. The screen plate restraining member 5 is placed on the upper surface in the direction in which the squeegee device moves, on the upper surface in the vicinity of one side edge of the substrate 2 covered by the screen plate 3 (FIG. 2A). reference).
[0024]
Next, the screen plate holding member 5 is moved at a constant speed toward one side 4a of the frame body 4 (see arrow d in FIG. 2A), and the frame body 4 is centered on one side 4a of the frame body 4. The other side 4b is raised obliquely upward from the substrate 2 at a constant speed (see arrow e in FIG. 2B). The screen plate restraining member 5 may roll or may be in sliding contact without rolling.
[0025]
Until the screen plate holding members 5 and 5 come close to one side 4a of the frame 4 (see FIGS. 2C and 2D), the screen plate holding member 5 is moved and the other side 4b of the frame 4 is raised. End the release. In the second embodiment, the other side 4b of the frame 4 is rotated around the one side 4a at a constant speed. However, with the frame 4 fixed, the other side around the one side of the substrate 2 is fixed. May be moved so as to rotate downward at a constant speed.
[0026]
Thus, the moving speed and the frame body of the screen plate restraining member 5 which makes the separation of the plate appropriate in a state where there is no printing failure in consideration of peeling, collapse, adhesion failure, etc. 4 is set in advance, and as shown in FIG. 3, the inclination angle θ of the screen plate 3 with respect to the substrate 2 is always constant, so that the inside of the printing openings (pattern holes) 6 is maintained. It is easy to find the angle θ where the pattern 7 made of the printing material is not kicked or thinned. However, the inclination angle θ varies depending on the properties of the printing material and the definition of the printing openings 6.
[0027]
Therefore, the movement of the screen plate holding member 5 at a constant speed and the mechanism for raising the screen plate 3 from the substrate 2 at a constant speed will be described. Basically, this may have any structure. A frame 4 on which the plate 3 is stretched; a screen plate holding member 5 made of a rod-like body having a length that is placed on one side 4a on the screen plate 3 and extends to at least the front and rear opposing sides of the substrate 2; A support body that supports the screen plate holding member 5 so as to be movable up and down, and a drive mechanism fixed to the frame body 4 so as to move the support body along the screen plate 3 at a constant speed. For the lifting mechanism of the frame 4, various means such as fixing the air cylinder to the base 1 and coupling the frame 4 to the piston rod can be adopted.
[0028]
As an example, as shown in FIG. 4, an air cylinder 10 is fixed to one side 4 a and the other side 4 b of the frame body 4, and a box 12 is coupled to the upper end portion of the piston rod 11. Are engaged with each other so as to be able to reciprocate in the horizontal direction. A rack 14 is formed on the rod 13, and a pinion 15 that meshes with the rack 14 is provided on the box 12 so as to be rotatable and the shaft 16 can be driven to rotate by an appropriate electric motor. The rod 13 is L-shaped, and its end is extended to the screen plate 3, and a roller 17 is rotatably supported as a screen plate holding member 5 at its lower end. The air cylinder 10 may be replaced with a column in which a rack is supported, and a box in which a pinion meshing with the rack is rotatably supported is engaged with the column.
[0029]
【The invention's effect】
According to the present invention described above, when the plate is released after screen printing, the rod-shaped body that is in sliding contact with the screen plate and the frame body on which the screen plate is stretched are moved at a constant speed. Optimum separation work can be achieved with a constant inclination angle. Further, since the screen plate restraining member always prevents the screen plate from bouncing by coming into contact with the screen plate, it is possible to prevent the screen plate from fluttering when the plate is separated.
[Brief description of the drawings]
FIGS. 1A to 1E are process explanatory views of a first embodiment of the present invention. FIGS. 2A to 2D are process explanatory views of a second embodiment of the present invention. 3 is an enlarged cross-sectional view of the plate separation state according to the present invention. FIG. 4 is a side view of the main part of the plate separation control device according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Substrate 3 ... Screen plate 4 ... Frame 5 ... Screen plate restraining member 10 ... Air cylinder 11 ... Piston rod 12 ... Box 13 ... Rod 14 ... Rack 15 ... Pinion 16 ... Shaft 17 ... Roller

Claims (2)

  After printing after the squeegee device has finished moving on the upper surface of the screen plate, on both the left and right sides facing the frame body on which the screen plate is stretched, the screen plate holding members each made of a rod-shaped body are at least at both ends of the printing material. Placed on the screen plate in an arrangement that extends almost to the front and rear opposing sides, and the pair of screen plate holding members press the screen plate toward the substrate to be printed, and synchronize with a substantially central portion of the screen plate at a constant speed. The screen plate is peeled from the printing material while the frame body moves at a constant speed in parallel and perpendicularly to the printing material, so that the inclination of the screen plate with respect to the printing material is always a constant angle. A method for controlling plate separation in screen printing.   A frame body on which a screen plate is stretched; a screen plate restraining member comprising a pair of rod-shaped bodies that are placed on the left and right opposing sides of the screen plate and extend at least to the front and rear opposing sides of the printed material; and the screen plate A screen comprising: a pair of supports that respectively support the restraining members so as to be movable up and down; and a synchronous drive mechanism that is fixed to the frame so as to move the supports along the screen plate at a constant speed. Plate separation control device for printing.

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