JPH0740523A - Multicolor screen printing machine - Google Patents

Abstract

PURPOSE:To obtain a simple multicolor screen printing machine capable of easily obtaining printed matter free from color shift without performing complicated operation. CONSTITUTION:A multicolor screen printing machine has an original form making stand 1, an original form film 2, a photosensitive stand and a screen gauze attaching frame 3 and the positioning of the original form film 2, the upper lid of the printing machine and the screen gauze attaching frame is executed by an engaging mechanism consisting of bosses 11 having centers on the X-X line and Y-Y line crossing at the almost central parts of the surfaces of the original form making stand 1, the photosensitive stand and the upper lid and the slots 21 permitting the insertion of the bosses 11 and having centers on the lines provided to the original form film 2 and the screen gauze attaching frame and extended in the directions of those lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple type multi-color printing screen printing apparatus capable of easily obtaining a printed matter which is not color-shifted without performing a complicated operation.

[0002]

2. Description of the Related Art In the conventional screen printing method, very troublesome work is required to prevent color misregistration during multicolor printing. For example, after printing the first plate on a card with a printing machine, a transparent alignment sheet is set on the printing machine, and the second plate is printed on the sheet. And the first edition and 2
If the color of the plate is misaligned, move the position of the card holder of the printing machine to the front, rear, left, and right to adjust the misalignment, fix the card holder, and then remove the alignment sheet and remove the second plate. To print. The same operation is repeated for the third and subsequent editions.

[0003]

Attempts have been made to simplify such complicated operations, but all of them are commercial, exaggerated, and expensive. It could not be applied to the simple printing device used.

Further, since a simple type printing apparatus needs to be provided at a low price, the apparatus must be mass-produced by molding. However, in order to prevent color misregistration, for example, if the fitting standard of the engaging portion between the printing device and the screen frame is designed to be the minimum, it is often impossible to set both.

That is, although the cutting accuracy at the time of producing a mold for mold forming has been remarkably improved in recent years due to the development of machine tools, the mold shrinkage of the molding material cannot be avoided. Although the molding shrinkage rate of a molding material is provided as a temporary standard for that material, it may vary depending on the shape of the molded product, molding conditions, post-molding treatment conditions, or the material brand or lot. Moreover, it may vary depending on the part of the molded product.

[0006]

A multicolor printing screen printing apparatus of the present invention comprises an original plate and an original film in an original plate manufacturing process, a photosensitive plate, a screen frame and an original film in a photosensitive device, and a printing machine in a printing process. The positioning of the upper lid and the screen screen attachment frame is performed by inserting a boss having a center on the X-X line and the Y-Y line intersecting at the center of the surface of the original plate, the photosensitive table and the upper lid, and the boss. , The original film and the screen gauze attachment frame, which has a center on the line, and an engaging mechanism consisting of elongated holes extending in the line direction, characterized in that It can be resolved.

[0007]

That is, since the shape of each molded product of the screen printing apparatus is a substantially rectangular or rectangular frame, for example, when molding by an injection molding method, the molding material is directly supplied from the center of the cavity, or It is customary to supply to the frame wall portions on both sides via runners provided on a straight line passing from the center of the cavity to the point.

Therefore, the apparent shrinkage at each position of the molded product occurs toward the center of the molded product. Therefore, the inner surface of the rectangular cavity has an X that intersects at the center.
-In a molding product obtained by pouring a molding material from the center of the cavity with a molding die in which two cylindrical holes for forming a boss having a center on the X-ray and the Y-Y line are cut on both sides of the intersection, respectively. , The distance between the centers of the formed bosses changes from the distance between the centers of the cylindrical holes of the molding die due to the shrinkage of the molding material, but the centers of the respective bosses are on the original XX line and YY line. .

Since the engaging mechanism in the multi-color screen printing apparatus of the present invention is constructed as described above, the shrinkage rate of the molded product differs from the reference molding shrinkage rate at the time of designing the molding die, so that the boss Even if the position changes from the design position, the boss on the XX line is the XX of the opponent
The long hole on the line, the boss on the Y-Y line is the opponent's Y-
The elongated hole on the Y line absorbs the dimensional variation during molding, and the two are securely and easily engaged. Therefore, by minimizing the diameter of the boss and the distance between the parallel edges of the elongated holes, the positional deviation between the insert and the inserted object can be suppressed to half or less of the difference between the distance and the diameter.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail according to the order of each step of multicolor screen printing with reference to the drawings.

FIG. 1 is a plan view showing an example of an original plate 1 of the present invention. The original plate making base 1 is formed by injection molding from a thermoplastic synthetic resin into a rectangular mold, and the molding die is one in which a molding material is injected from a gate provided in the center of the rectangular mold cavity. . The inner surface of the cavity of the molding die is on the X-X line and the Y-Y line which are parallel to the inner edge of the cavity and are orthogonal to each other at the center. Cylindrical holes for boss formation centered at positions equidistant from are drilled at four locations.

Four cylindrical bosses 11 are provided on the surface of the original plate making base 1 molded by the above-mentioned molding die. These cylindrical bosses 11 have centers at equidistant positions on the XX line and the YY line orthogonal to each other in the center of the original plate 1 on both sides of the intersection point O with respect to each line. ing.

At the center of the surface of the original plate making table 1, there is provided a positioning recess 12 which is slightly larger than the original and has a depth of about half the thickness of the original. The recess 12 is used to accurately place the document so that the document does not move by using the two sides that are in contact with each other. In place of the depression 12, a convex bank or a marking line is put on the surface of the original plate 1 and the original is placed in accordance with it, and the corner of the original is fixed to the original plate 1 with an adhesive tape. Good.

Next, the original film 2 made of transparent synthetic resin is placed on the surface of the original plate 1 as shown by the chain double-dashed line in FIG. FIG. 2 is a drawing showing that state when the XX line section of FIG. 1 is viewed in the direction of the arrow. The original film 2 has four elongated holes 21. The long hole 21
Is based on the center position of the cylindrical hole at the time of designing the cavity of the molding die for manufacturing the original plate 1, and extends to the left and right in the X-X line or the Y-Y line direction passing through the center of the cylindrical hole. It is shaped and punched at four locations at the same time.

Therefore, even if the position of the boss 11 of the original plate 1 is changed, as described above, the XX line and the Y-Y line that are orthogonal to each other at the center of the original plate 1 are to be expected.
Since it is a shift that moves on the line, as shown in FIG.
It is possible to smoothly insert each elongated hole 21 of the original film 2 into each boss of the original plate 1 without changing the shape of the elongated hole 21.

As shown in FIG. 3, the distance between the parallel portions 23 of the elongated hole 21 is 0.1 from the outer diameter of the boss 11.
The original film 2 and the original production table 1 are accurately engaged with each other within 0.05 mm even if they are deviated from each other, because they are only enlarged by about mm. Therefore, the deviation between the plurality of original films obtained by copying the color-separated image from the original document is also within the range. And, the deviation is much smaller than the deviation caused by the brush stroke when copying the original from the original film by hand. The long hole 21 is longer than the diameter of the boss on both sides of the XX line or the YY line from the center position of the boss 11 inserted into the long hole when the boss 11 is designed. In FIG. 1, 22 is
It is a cutout provided in the original film 2 and is used for distinguishing between the front and back and the upper and lower sides of the original film 2.

FIG. 4 is a plan view showing a photosensitive table 5 and a screen screen mounting frame 3 placed on the photosensitive table 5 via an original film 2 (not shown) in the photosensitive device. And in Figure 5,
FIG. 4 is a cross-sectional view of the section taken along the line X-X in FIG.

The screen gauze attachment frame 3 is a frame body manufactured by injection molding from synthetic resin, and in the molding die thereof, the molding material is provided from the center of the cavity on the XX line passing through the center of the cavity. It is supplied through the runners through the frame walls on both sides. Then, on the inner surface of the cavity of the mold, at a position corresponding to a cylindrical hole for forming a boss in the cavity of the document table 1, from the center of the hole, XX
A projection for forming an elongated hole extending leftward and rightward along the line or the line YY is projected.

That is, as in the case of the original film 2, the screen gauze mounting frame 3 formed by a die is intersected by an intersection point O on each of the X-X and Y-Y lines which are orthogonal to each other at the center thereof. Slotted holes 31 extending in the line direction are formed at equal distances on both sides of the slot 31 during molding. In FIG. 4, at the position of the long hole 31,
Although the parallel portion of the long hole is shown by the notch 32 extending to the outer edge of the frame, either may be adopted.

A screen mesh 4 covering the entire area of the frame is attached to the molded screen mesh mounting frame 3 on the back side thereof in a stretched state. A photosensitive film is formed on the screen mesh 4 by a known method. In manufacturing the screen gauze attachment frame 3, it is important to select a molding material and to set a frame width dimension in order to prevent the gauze 4 from being deformed by the tension.

The photosensitive base 5 is a frame body similar to the screen screen attachment frame 3, and the molding material is also XX from the center thereof.
It is supplied through the frame walls on both sides via runners provided on the line. Then, like the original plate 1, the bosses 51 having centers at equidistant positions project on both sides of the intersection point O on the X-X line and the Y-Y line orthogonal to each other in the center. Has been done. Further, a step portion for holding the periphery of the transparent glass 52 is provided on the inner wall of the photosensitive table 5.

Therefore, the elongated holes 21 of the original film 2 are first inserted into the respective bosses 51 of the photosensitive base 5, and the screen cloth 4 attached next is brought into contact with the original film 2.
Each elongated hole 31 or each notch 32 of the screen mesh frame 3 is inserted. Then, the lamp 6 is caused to emit light, the screen gauze 4 is exposed to light, and post-treatments such as washing with water and drying are carried out, so that the screen gauze 4 is made into a plate. If this operation is repeated for each color-separated original film, for each color,
A screen-printed silk cloth 4 is obtained.

At this time, the positions and sizes of the bosses 51 of the photosensitive base, the long holes 21 of the original film 2, the long holes 31 of the screen frame 3 or the notches 32 are formed as described above. Therefore, the displacement between the screen screens 3 made by the engagement mechanism hardly occurs.

FIG. 6 is a sectional view of the printing machine, showing a state in which the upper lid 7 is closed and is in contact with the printing table 8. Meanwhile, FIG.
FIG. 4 is a side view showing a state where the upper lid 7 is lifted from the printing table 8. One end of the upper lid 7 is rotatably attached to one end of the printing table 8 by a hinge pin 73. The projections 72 provided on the upper lid 7 are shaped to fit into the recesses of the printing table 8, and are set in a fixed position on the printing table 8 when the upper lid 7 is closed.

The upper lid 7 is a frame body similar to the photosensitive table 5, and is provided with a cutting step 72 on the surface side for accommodating the screen frame 3 to allow the screen frame 3 to be accommodated. A boss 71 is provided at a position similar to. Therefore, the fitting between the upper lid 7 and the screen screen attachment frame 3 is similar to that of the photosensitive table 5 and the screen screen attachment frame 3, and even if the center-to-center distance between the two bosses 71 on the same line changes. Since the center of 71 is on the X-X line or the Y-Y line which intersects at right angles, the upper lid 7 can be engaged with the screen screen attachment frame 3 of each color without shifting.

At the center of the printing stand 8, there is provided a paper stand 82 on which the paper to be printed is placed. When the upper lid 7 is closed, the screen cloth of the screen cloth attachment frame 3 attached to the upper lid 7 is attached. Bring the paper closer to 4. Also, the paper tray 8
On the second surface, there is provided a positioning recess 81 for positioning the paper, the depth being about the thickness of the paper and slightly larger than the paper. Instead of the depression 81, a convex bank or a scribe line may be provided on the surface of the sheet table 1 and the sheet may be placed in accordance with the line.

As described above, the screen lid mounting frame 3 of each color is accurately engaged with the upper lid 7, and the upper lid 7 is attached to the printing table 8.
Of the paper table 82 of the printing table 8 which is set to the fixed position of
Since it is placed at a predetermined position, a beautiful screen-printed product with no color shift can be obtained.

In the above-mentioned embodiment, on the X-X line and the Y-Y line which are orthogonal to each other in the center, the center of the boss or the center of the slotted hole is located at equal distances on both sides of the intersection point O with respect to each line. Although the example of locating is shown, X-
The intersection angle of the X-ray and the Y-Y line may not be a right angle,
Further, the distance from the intersection O does not have to be equal. However, it is important that the positions of the boss and the slot are provided on the X-X line and the Y-Y line which intersect at a predetermined angle. However, in manufacturing the cavity of the molding die and the punching blade, it is particularly preferable that the intersecting angle of the X-X line and the Y-Y line is a right angle because machining can be performed with high accuracy.

In the above-described embodiment, the original plate making table 1,
Although the photosensitive table 5 and the top cover 7 are shown as separate items,
The top cover 7 of the printing machine can also serve as the original plate 1 and the photosensitive table 5. In the exposure step, the upper cover 7 can be used with the printing table 8 open.

Further, in the above-mentioned embodiment, an example in which a synthetic resin is molded by an injection molding method is shown, but the present invention is also applied to a synthetic resin compression molding method, and a die-cast molding method using a metal material. be able to. Although the boss has a cylindrical shape, it may have a rectangular parallelepiped shape extending along the reference line.

[0031]

According to the present invention, the original plate and the original film, the photosensitive table and the screen screen attachment frame and the original film in the photosensitive device, and the respective engaging mechanisms of the upper lid of the printing machine and the screen screen attachment frame in the printing process, Since it is configured as described above, the molding material used is different from the one used at the time of designing, because it was molded depending on the machine accuracy during processing of the molding die, or because it varied from the molding shrinkage rate expected when the molding die was manufactured. Since the boss or the slot is moved from the predetermined position, the boss or the long hole can be smoothly engaged as long as it is on the XX line and the YY line intersecting at the center. That is, the boss on the XX line is a slot on the mating XX line, and the boss on the YY line is a slot on the mating YY line to absorb dimensional changes during molding. .

Therefore, since the gap between the parallel portions of the long holes and the outer diameter of the boss can be minimized, the color misregistration between the original and the printed matter is manually performed from the original to the original plate. The copying step to the film is the maximum, and the deviation at the transfer step is practically negligible.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an original plate of the present invention.

FIG. 2 is a cross-sectional view of a section taken along line X-X in FIG.

FIG. 3 is an enlarged view of an elongated hole.

FIG. 4 is a plan view showing a photosensitive table 5 and a screen screen attachment frame arranged thereon.

5 is a cross-sectional view of a section taken along line X-X in FIG. 4 viewed in the direction of the arrow.

FIG. 6 is a cross-sectional view of the printing machine, showing a state where the upper lid is closed and is in contact with the printing table.

FIG. 7 is a side view showing a state where the upper lid is lifted from the printing table.

[Explanation of symbols]

 1 original plate making table 2 original plate film 3 screen gauze mounting frame 4 screen gauze 5 photosensitive stand 7 upper lid 11 boss 21 elongated hole 31 elongated hole 51 boss 71 boss

Claims (1)

[Claims] 1. A master plate and a master film in a master plate manufacturing process, a photosensitive carrier and a screen mesh mounting frame and a master film in a photosensitive device, and a positioning of the upper lid of the printing machine and the screen mesh mounting frame in a printing process are performed by the master plate. X intersecting at approximately the center of the surface of the production table, photosensitive table, and top cover
-A boss having a center on the X-ray and the Y-Y line, and a boss that is inserted into the boss and that is provided on the original film and the screen screen attachment frame, has a center on the line and extends in the direction of those lines. A multicolor screen printing device characterized by an engagement mechanism consisting of elongated holes.