JPH025948Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary screen printing machine that enables high-quality and accurate printing at all times.

Traditionally, rotary screens have been used as a relatively efficient method for textile printing because they can perform continuous screen printing, but they are difficult to print with precision compared to flat screens, so It has been said that it cannot be applied to the printing field.

An object of the present invention is to provide a printing machine that uses such a rotary screen and is capable of printing electronic components, printed circuits, etc. that require precision in microns.

The printing machine of the present invention has a doctor 5 and a squeegee 2 inside the rotary screen 1, the doctor 5 forms an ink layer 4 on the screen 3, and the ink layer 4 is scraped off with the squeegee 2 so that printing can be performed.
They are arranged in parallel, one behind the other, and are characterized in that the squeegee 2 can selectively move up and down so that the ink accumulated behind the squeegee 2 after printing can be sent to the doctor 5 side.

In general, rotary screen printers print using a circular motion around the circumference, so there is no need to return the ink, and it has been thought that printing can be performed with good work efficiency. However, when printing very precise designs, it is necessary to constantly supply a constant amount of ink 6 in the width direction of the screen 3, and the speed of drying of the ink on the screen surface also slightly affects the printing accuracy. It is something that has an impact.

In this invention, by installing the doctor 5, a constant amount of ink 6 can be constantly applied to the inner surface of the screen, and in the process of printing the ink through the screen 3 with the squeegee 2, even if the ink accumulates behind the squeegee 2, the squeegee Since the ink can be immediately sent to the doctor 5 side by the vertical movement of 2, the thickness of the printed ink can always be kept constant, and the screen surface is not unduly dried, so it is possible to send the ink to the doctor 5 side immediately. It also enables precise printing that requires precision. Furthermore, the present invention makes it possible to perform sheet-fed printing very effectively, which was unthinkable with conventional rotary screen printing.

The squeegee 2 of the present invention is placed in a lowered position to press the screen 3 against the printing material 7, and it is only necessary that it can be raised away from the screen 3 if necessary.
Although the spacing is not particularly limited, it is preferable that the doctor 5 be adjacent to the squeegee 2 to some extent within a range that does not harm the vertical movement of the squeegee 2. Also,
It is preferable that the squeegee 2 and the doctor 5 are arranged substantially parallel to each other, and in that case, the squeegee 2 is preferably moved up and down parallel to the doctor 5.

Next, regarding the relationship between the doctor 5 and the screen 3, the doctor 5 forms an ink layer 4 of a constant thickness on the screen 3 by the doctor 5, and so that the ink layer 4 is effectively used during printing. It is preferable that the material be present with a minute gap from the inner surface of the material.

Next, the usage state of the present invention will be explained according to the drawings.

For example, as shown in FIG. 1, the rotation of the rotary screen 1 and the speed of the conveyor belt 8 are driven in synchronization, and the printing material 7 is moved so that the pattern portion 9 of the screen 3 and the printing material 7 have a constant positional relationship. It is placed on the conveyor belt 8 and sent to the rotary screen 1.

A squeegee 2 and a doctor 5 are arranged in parallel inside the rotary screen 1, and the squeegee 2 squeezes the ink layer 4 formed on the surface of the screen 3 as shown in FIG. Print the pattern you are looking for.

When the squeegee 2 reaches the area 10 on the screen 3 of the rotary screen 1 where no pattern exists, the squeegee 2 is raised as shown in FIG. Ink return is performed.
As soon as the squeegee 2 sends the ink 6 to the doctor 5, it descends in front of the pattern section 9 of the screen 3, as shown in FIG. 1, and is again ready for printing.

In this manner, the printing machine of the present invention can always keep the surface of the screen 3 covered with the ink layer 4, and stable printing can be achieved. In addition, when carrying out sheet-fed printing, the conveyor belt 8 is formed porous, and the conveyor belt 8 is formed so as to sandwich the conveyor belt 8 and come into contact with the rotary screen 1.
It is preferable to provide a suction box at the bottom so that screen printing can be performed while the printing material 7 is brought into close contact with the conveyor belt 8 under suction.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams showing the usage state of the printing press of the present invention. 1... Rotary screen, 2... Squeegee, 3... Screen, 4... Ink layer, 5...
Doctor, 6... Ink, 7... Printing material, 8...
...Conveyor belt, 9...Pattern section, 10...
A part without a pattern.

Claims (1)

[Scope of claim for utility model registration] (1) Inside the rotary screen 1, the doctor 5
and a squeegee 2 are arranged in parallel in front of each other so that an ink layer 4 is formed on a screen 3 with a doctor 5, and the ink layer 4 can be scraped off with the squeegee 2 for printing. A rotary screen printing machine characterized by being selectively movable up and down so that ink accumulated behind the squeegee 2 can be sent to the doctor 5 side. (2) The rotary screen printing machine according to claim 1, which is characterized in that the squeegee 2 and the doctor 5 are arranged substantially parallel to each other. (3) The squeegee 2 is moved up and down on the screen 3 of the rotary screen at a portion where there is no pattern, and the ink is sent to the doctor 5. Rotary screen printing machine described in ).