KR950014386B1 - The printing method and apparatus for longitudinal rounding surface - Google Patents

Abstract

Ink on a ink roller(1) is transferred to a transfer roller(2) passing over an intermediary roller(7), and printed by contacting the transfer roller(2) and a printing matter. The rotation shaft(22) is coated by silicone rubber(24) except a shaft supporter, and a round uneven part is formed in the circumference face of the roller. The round uneven part is shrinked and expanded by pressing at a right angle to the rotating shaft(22).

Description

Continuous printing method of long, curved surface and its device

1 is an exemplary view of a print object.

2 is a schematic diagram of the present invention.

3 is a front view of the transfer roller according to the present invention.

4 is a longitudinal side view of FIG.

5 is a front view of the transfer roller being forcedly circumscribed by the ink roller.

6 is a cross-sectional view showing a transfer process to a curved surface.

* Explanation of symbols for main parts of the drawings

1: Ink Roller 2: Transfer Roller

22: axis of rotation 24: silicon rubber

26: surface uneven portion 3: printed matter

32: surface irregularities

The present invention relates to a method and an apparatus capable of continuously and efficiently printing up to a curved surface which is impossible to print with a flat surface smooth roller.

As a conventional printing method, as illustrated in FIG. 1, the geometric curved surface is continuous, and any pattern on the surface of the long object cannot be continuously printed by the roller type printing apparatus other than the transfer method using the transfer paper. Since ink rollers and transfer rollers are all made of metal with high surface hardness, ink rollers, knives, and transfer rollers could not all be processed to match the irregularities of the surface. It was because it was impossible in reality.

The present invention overcomes this problem and provides a method and apparatus capable of realizing a high-quality printing result with high printing accuracy, such as a continuous pattern printed on a smooth surface, which continues on a curved surface. As a result of thorough examination of the purpose, the present invention was finally discovered after seeing the fruit.

The present invention for implementing this, the transfer roller is made of an elastic body and at the same time the surface is formed in the concave-convex shape corresponding to the curved surface of the to-be-printed object, and the transfer roller is pressed against the surface of the ink roller to the smooth surface of the ink roller The stained ink is transferred to the curved surface and then transferred to the curved surface of the to-be-printed object. When the transfer roller is pressed against the ink roller, the curved surface of the transfer roller develops. This development may be less or less in the axial direction depending on the amount of pressure applied to the transfer roller. In this process, the transfer is effective when there is no overlapping part in the surface expansion process of the transfer roller. The overlapped parts are not in contact with the ink roller, so the pattern ink does not move.

Herein, the elastic body refers to rubber, and specifically, natural or synthetic rubber, silicone rubber and the like can be mentioned. Among them, silicone rubber is particularly preferable. Natural rubber and synthetic rubber have low efficiency of ink transfer due to surface oil property, natural rubber is not only excessive elasticity but also unsuitable due to weakness of chemical resistance and chemical resistance. Not suitable for low reasons.

An elastic transfer roller is one in which a silicon rubber tube is fitted to a metal rotating shaft or a silicon rubber is coated with a substantial thickness on the metal rotating shaft. In the former case, it is normal to give the surface of the silicon rubber tube a shape corresponding to the curved surface shape of the to-be-printed object, and in the latter case, give such a shape simultaneously with or after the silicon rubber coating.

In addition, the pressing pressure applied to ink rollers should be adjusted in such a way that the surface shape of the transfer roller is simple and the depth of the valley is shallow, and the surface pressure is complicated and the pressure is higher to increase the pressing pressure. The surface must always be flush with the surface of the ink roller to achieve a high quality printing effect as if printing on a flat surface.

The present invention is particularly useful when printing a pattern extending in the longitudinal direction on the surface of the to-be-printed object having a corrugated cross section or an inclined cross section.

Next, the Example of this invention is described in detail.

In FIG. 2, a suitable ink 5 for printing is injected into the ink container 4, and a metal ink roller 1 is buried with an appropriate amount of ink whenever a certain portion of the lower portion of the circumferential surface always contacts the ink 5 and rotates. The knife 6 which is installed so that it is brought up and the ink comes up and scrapes excess ink which dipped too much on the surface of the ink roller 1 and flows it into the ink container 4 is installed, and the transfer roller 2 is provided. Is a schematic illustration of a conventional printing apparatus which is engaged with the relay roller 7 circumscribed to the ink roller 1 so as to inherit the pattern ink.

Everything of the transfer roller 2 is shown well in the third and fourth degrees. In these figures, the rotary shaft 22 is covered with the silicone rubber 24 on the remaining portion, leaving only the shaft support portions at both ends thereof. The thickness is sufficient if the silicon rubber 24 crushed under the influence does not yet lose its elasticity even when the maximum pressing pressure is applied in the direction perpendicular to the rotation shaft 22. Moreover, the annular uneven part 26 corresponding to the surface unevenness | corrugation 32 of the to-be-printed object 3 is formed in the circumferential surface of the silicon rubber 24. As shown in FIG.

If the transfer roller 2 having such a structure, the relay roller 7 or the relay roller is omitted, it is directly circulated to the ink roller 1 and pressurized in the circumferential direction. The protruding portion elastically retracts or extends in the axial direction as if pushed onto the ink roller 1 to form a flat ground plane. Therefore, it is possible to transfer all the ink on the surface of the ink roller (1).

In this way, the silicone rubber 24 in which the ink is transferred is elastically contracted while being out of the circumferential relationship with the ink roller 1 and is expanded while the pressing pressure is released, thereby regaining its original shape. In the state returned to the state before the ink was buried, this time, it contacts with the surface asperity 32 of the to-be-printed object 3 similarly to the cross-sectional shape of the annular uneven part 26. In this contacting process, the transfer and printing of the pattern ink just buried in the annular uneven portion 26 is carried out.

Therefore, the present invention is able to print even the V-shaped inclined surface, U-shaped inclined surface, concave curved surface, and even the pattern printing on the surface connected to these smooth surfaces, which have been considered as impractical until now, The breakthrough will be expected.

Claims (2)

A rotary ink roller in which ink is embedded in an ink container is transferred to a transfer roller through an external relay roller, and is then printed on the transfer roller by covering a silicon rubber on a rotating shaft, By using the transfer roller having the annular irregularities, and applying a pressing pressure in a direction perpendicular to the rotation axis of the transfer roller, the annular irregularities circumscribed to the ink roller are contracted or expanded in the center direction or the coaxial direction to be circumscribed on the ink roller with a flat surface. After removing the ink from the surface of the ink roller and releasing from the external state with the ink roller, it is released from the restraint of the pressing pressure to restore the original shape. Long printing method, characterized in that the continuous printing of the curved surface. The rotary ink roller 1 in which the ink 5 contained in the ink container 4 is embedded is transferred to the transfer roller 2 via the intermediate roller 7 circumscribed therein, and is transferred to the transfer roller 2 which has been transferred. In the apparatus for external printing, the long-term bending is characterized in that the silicon rubber 24 is coated on the rotation shaft 22 of the transfer roller 2, and the annular uneven portion 26 is formed on the circumferential surface thereof. Cotton printing device.