JPH04201256A - Squeezee structure of printing press - Google Patents

Abstract

PURPOSE:To prevent printing inferiority to be generated because there is no paint or paste on a printing plate by providing a paste dropping means scraping off the paint or paste bonded to squeezee rubber after printing to allow the same to forcibly fall on the printing plate. CONSTITUTION:When a squeezee 1 reaches a terminal after printing to begin to rise, an air cylinder 6 is extended to allow a paste dropping member 7 to fall along the side surface of squeezee rubber 1b and the paint or paste 8 bonded to the side surface of the squeezee rubber 1b is scraped off to be allowed to fall on a printing plate 3. Then, a squeezee 2 moves in the direction opposite to that of the squeezee 1 to again perform printing. Thereafter, when the squeezee 2 reaches the start end of the printing plate 3 to begin to rise, the air cylinder 6 is extended to allow the paste dropping member 7 to fall along the side surface of the squeezee rubber 2b and the paint or paste 8 bonded to the side surface of the squeezee rubber 2b is allowed to fall on the printing plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a squeegee structure for a double squeegee printing press that achieves high reliability and high quality by reducing printing defects.

[Prior Art] A conventional double squeegee type printing machine has a pair of squeegees a and b, as shown in FIG. The printing plate d moves while being pressed onto the printing plate d, and prints on the substrate e provided below the printing plate d, and rises at the end. At this time, paint, paste, etc. C adhering to the squeegee rubber f of the squeegee a falls onto the printing plate d due to its own weight.

Thereafter, as shown in FIG. 5(B), the other squeegee b performs the same operation from the opposite direction to the squeegee a, and printing is repeated.

[Problems to be Solved by the Invention] In the conventional printing press described above, after printing using one squeegee,
When the squeegee a rises, the paint, paste, etc. C adhering to the squeegee rubber f falls onto the printing plate d due to its own weight. However, if the viscosity of the paint, paste, etc. C is high, the squeegee a may end up Even if the rubber reaches the squeegee rubber f, it may not fall onto the printing plate d, as shown in FIG. 6(a).

As a result, the other squeegee b prints on the printing plate d without any paint or paste C as shown in Figure 6 (b), resulting in poor reliability such as printing defects. Ta.

The present invention was made for the purpose of improving the above-mentioned drawbacks, and it provides a squeegee structure for a printing press that allows paint, paste, etc. to fall reliably onto a printing plate even if the viscosity or amount of the paint or paste is not constant. This is an attempt to improve sexual quality.

[Means for Solving the Problems] In order to achieve the above object, the present invention prints paint, paste, etc. on the printing plate by moving a pair of squeegees alternately along the printing plate and using a squeegee rubber provided on each squeegee. In a printing machine that prints on a substrate installed on the underside of the printing plate by pressing it against the plate, each squeegee scrapes off paint, paste, etc. that has adhered to the squeegee rubber after printing, and forces it onto the printing plate. It is equipped with means for dropping the paste.

[Function] With this configuration, paint, paste, etc. adhering to the squeegee rubber are forcibly dropped onto the printing plate each time printing is performed with each squeegee. This will help prevent printing defects.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 3.

Figure 1 is an overall view of a double squeegee type printing machine;
FIG. 2 shows an enlarged view of the squeegee portion.

In FIG. 1, 1 and 2 represent a squeegee, and 3 represents a printing plate.

As shown in FIG. 2, the squeegees 1 and 2 have squeegee holders la and 2a rotatably connected to a holder holder 4 by pins 5, and these squeegee holders la,
2a is rotatable around a pin 5, and each squeegee halter la.

Pins lc and 2c protruding from 2a are fitted into elongated holes 4a vertically formed in the holder receiver 4, thereby restricting the rotation range of each squeegee holder la and 2a.

Furthermore, squeegee rubbers lb and 2b are attached to each of the squeegee halters la and 2a, respectively.

Each of the squeegee rubbers 1b, 2b has a flat rectangular shape, and has a length slightly shorter than the width of the printing plate 3.
Upper end side or squeegee holder la.

2a, respectively.

On the other hand, numeral 6 in the figure is an air cylinder fixed to the opposing surface of each squeegee holder la, 2a, and a paste dropper 7 is attached to the tip of a piston rod 6a that projects downward from these air cylinder cylinders.

The paste dropper 7 is formed to have approximately the same length as the squeegee rubbers lb and 2b, and has the squeegee rubbers lb and 2b on the lower end side.
A scraping portion 7a is formed which slides into contact with the side surface of 2b.

The tip of the scraping portion 7a is formed into an edge shape, and by moving the paste scraper 7 up and down along the side surfaces of the squeegee rubbers lb and 2b using an air cylinder 6, paint, paste, etc. adhering to the squeegee rubbers lb and 2b are removed. can be scraped off.

In the figure, reference numeral 9 denotes a substrate to be printed, which is placed below the printing plate 3.

Next, the operation will be explained with reference to FIG.

From the state where it is waiting in an almost convex shape above the starting edge of the printing plate 3,
First, one squeegee 1 descends together with the ski 7 holder 1a, and its tip abuts on the printing plate 3.

In this state, move in the direction of the arrow and press the squeegee rubber 1.
Remove the paint, paste, etc. 8 from the printing plate 3 with the tip of the printing plate 3.
Printing is performed on the substrate 9 placed below the printing plate 3 by pressing it upward.

After that, when the squeegee 1 reaches the end and starts to rise, the air cylinder 6 extends and the paste dropper 7 is lowered along the side surface of the squeegee rubber 1b, scraping off the paint, paste, etc. 8 attached to the side surface of the squeegee rubber 1b, and printing. Drop onto Plate 3.

Next, the other squeegee 2 is lowered together with the ski 7 holder 2a, and the tip of the squeegee rubber 2b comes into contact with the printing plate 3.

In this state, the squeegee 2 is moved in the opposite direction to the squeegee 1, and the paint, paste, etc. 8 dropped onto the printing plate 3 is pressed against the upper surface of the printing plate 3 by the squeegee rubber 2b, and printing is performed again.

After that, reach the starting edge of squeegee 2 or printing plate 3 and press squeegee 2.
When the paste starts to rise, the air cylinder 6 extends to lower the paste dropper 7 along the side of the squeegee rubber 2b.
Paint, paste, etc. attached to the side of the squeegee rubber 2b 8
is dropped onto the printing plate 3.

By repeating the above operation, the two squeegees 1 and 2 are
Printing is performed continuously on the substrate 9 placed below the printing plate 3, and even if the paint or paste has a high viscosity or is small and does not fall under its own weight, it is forcibly scraped off by the paste remover 7. Furthermore, FIG. 4 shows another embodiment, which will be explained next.
A rotless air cylinder 11 is attached in the longitudinal direction of the squeegee holders la and 2a.

This rotless air cylinder 11 is configured to be movable along either a moving member 11a or a kite rod 11b by air pressure, and a spatula-shaped paste dropper 12 is attached to this moving member 11a.

The paste dropper 12 is bent in the middle part into a substantially V-shape, and the scraping part 12a on the tip side is
The squeegee rubbers 1b, 2b are in sliding contact with the sides of the squeegee rubbers 1b, 2b, and by moving the movable member 11a of the lotless air cylinder 11 in the direction of the arrow as the squeegee 1.2 rises after printing with each squeegee 1, 2, the squeegee rubbers lb, 2b
The paint, paste, etc. 8 attached to the printing plate 3 can be scraped off onto the printing plate 3.

Further, by releasing the air in the paste removal air cylinder 11 after scraping, the paste remover 12 returns to its original position together with the moving member 11a and waits for the next scraping.

[Effects of the Invention] As detailed above, the present invention is provided with a paste remover on the squeegee that forcibly scrapes off paint, paste, etc. adhering to the squeegee rubber and drops it onto the printing plate. Even if the viscosity is high or the amount is small and it is difficult to fall under its own weight, it can be reliably dropped onto the printing plate.

This prevents printing defects caused by paint or paste from falling onto the printing plate, improving reliability and providing high-quality printing.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of a printing press showing one embodiment of the present invention, Fig. 2 is an enlarged front view of the squeegee portion, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 shows another embodiment. An explanatory diagram shown in Fig. 5 (
A), (B) and Figure 6 (A). (B) is an explanatory diagram of a conventional printing press. 1.2... Squeegee, la, 2a... Squeegee holder, lb, 2b... Squeegee rubber, 3... Printing plate, 7
...Paste removal, 8...Paint, paste, etc., 9...
substrate. Figure 2 Figure 3 Figure 4 +'D, lO1 a Figure 5 (A) Figure 5 (B)

Claims (1)

[Claims] By moving a pair of squeegees alternately along the printing plate and pressing the paint, paste, etc. on the printing plate onto the printing plate using the squeegee rubber provided on each squeegee, printing is performed on the substrate provided on the underside of the printing plate. A squeegee structure for a printing press, characterized in that the squeegee is provided with paste dropping means for scraping off paint, paste, etc. adhering to the squeegee rubber after printing with each squeegee and forcibly dropping it onto the printing plate.