JPH0215389B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink supply mechanism in a printing press such as an offset printing press.

[Conventional technology]

The ink supply mechanism in a printing press such as a conventional offset printing press generally has the following structure, as shown in Fig. 2.
It is done. That is, the ink is stored in the ink fountain 11.
The ink is intermittently drawn out in small quantities by the feeding roller D from the original roller J in contact with the printing plate. Torso 12
is supplied to the printing plate 13. Since it is necessary to uniformly supply the printing surface 13, the above-mentioned ink supply mechanism includes ten or more rollers between the deposition rollers A, A' that contact the printing surface 13 and the feeding roller D. Moreover, by constantly swinging some of the rollers in the axial direction, the ink on the printing plate 13 is evenly supplied.

[Problem to be solved by the invention]

However, in the conventional ink supply mechanism, the pattern 16 with the rectangular white area 15 on the printing paper 14
When trying to print, as shown in FIG. 3A, there are
Since no ink is supplied from the formation roller A, more ink remains on the portion 15b of the formation roller A that contacts the white portion 15a of the plate surface 13 than on other portions. Therefore, in such a state, even if the ink is evenly supplied to the forming roller A, the ink cannot be held uniformly on the forming roller A at all times. As a result, in the conventional ink supply mechanism, the pattern 16 with the rectangular white area 15 on the printing paper 14
If this is printed, dark and light areas 17 will be generated before and after the white area 15 in the printing direction, respectively.

Further, since the plate cylinder 12 is usually several times larger in diameter than the deposition rollers A and A', the deposition rollers A and A' rotate several times for each rotation of the plate cylinder 12.
Therefore, the ink is supplied over the entire surface of the plate cylinder 13 by several rotations of the application rollers A and A'. However, as shown in FIG. Although the ink is not supplied to the formation rollers A and A', since the ink is supplied to the formation rollers A and A', ink is accumulated on the formation rollers A and A'. On the other hand, if the application rollers A and A' rotate once after starting the supply of ink to the printing plate 13, most of the accumulated ink will be taken up by the printing plate 13. From the second rotation, the ink newly supplied to the forming rollers A and A' is supplied to the plate surface 13, and since the ink is not accumulated on the forming rollers A and A', as shown in Fig. 3. In the printing paper 20 having the pattern 19, there will be areas of light and shade 21 in the printed portion.

The present invention has been made in view of the above circumstances, and provides an ink supply mechanism for a printing press that can always uniformly and appropriately supply ink to the plate surface of a plate cylinder under any conditions. The purpose is to

[Means to solve the problem]

In order to solve the above problems, the ink supply mechanism in the printing press of the present invention includes a geared formation roller A that is smaller in diameter than the plate cylinder and rotates in the same direction as the plate cylinder; A rubber roller D with a gear that rotates in the opposite direction to the deposition roller A, an original roller J with a drive motor that has a smaller diameter than the rubber roller D and rotates in the same direction as the rubber roller D, and the deposition roller A and the rubber. Geared swinging rollers F and H have a smaller diameter than roller D and rotate in the same direction as rollers A and D, and rollers F and H have the same diameter as swinging roller F and rotate in the opposite direction to deposition roller A. Rubber roller B
, a gold roller C that has a smaller diameter than rubber roller B and rotates in the same direction as rubber roller B and rubber roller D, and a gold roller E that has the same diameter as gold roller C and rotates in the same direction as rubber roller D. The rollers are rotated by the drive of the plate cylinder and the original roller J, and the gold roller E
The ink is retained on the contact surface between the rubber roller D and the gold roller E, and the ink is applied to the printing plate via the rubber roller D, swing rollers F and H, and the formation roller A, on the condition that the speed of the rubber roller D is lower than that of the rubber roller D. The amount of ink is adjusted while being supplied, and the ink remaining on the printing plate is returned to the original roller J via the deposition roller A and each rubber roller B, C, and D.
By continuously kneading new ink and kneading with new ink, it is possible to stably supply a uniform and appropriate amount of ink to the plate surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an ink supply mechanism in a printing press according to the present invention, and 1 is an ink fountain. 3 is a supply ink that supplies ink 2 contained in the ink fountain 1 to the plate surface 7 of the plate cylinder 6, and 4 is the remaining ink. Reference numeral 5 indicates a retained ink in which this residual ink 4 is collected in one place. Next, to explain in detail the method of supplying ink to the printing plate 7, first, the original roller J in contact with the ink fountain 1 is driven by an independent motor (not shown), and the ink 2 contained in the ink fountain 1 is driven by a separate motor (not shown). from the original roller J to the rubber roller D
Transfer to. Next, the metal roller E, which is slowed down more than the rubber roller D and linked to the rotation of the original roller J, supplies the necessary amount of ink for printing from the contact surface of the rubber roller D (with an adjustable distance). 3 (thick lined part) is transferred to the deposition roller A via the swinging rollers F and H rotated by the rubber roller G. At this time, each swing roller F, H
Since the ink is constantly oscillated in the axial direction, the supplied ink 3 is mixed. The supply ink 3 kneaded in this manner is further supplied to the plate surface 7 of the plate cylinder 6 via the deposition roller A. After being supplied to the printing plate 7 in this way, the remaining ink 4 (the part indicated by the dotted line) is sent back to the original roller J by two rubber rollers B and D, which are rotating in the opposite direction to the formation roller A. The ink is collected on the contact surface of the gold roller E, which is interlocked with the rubber roller D, and is mixed and retained with the ink 2 supplied from the source roller J to form the retained ink 5. In other words, the remaining ink 4 of the supplied ink 3 once supplied to the plate surface 7 and the ink 2 newly supplied from the ink fountain 1 are kneaded, and the collected accumulated ink 5 is continuously and cyclically supplied. Therefore, the ink 2 of the ink 1 can be stably supplied to the plate surface 7 of the plate cylinder 6 evenly and without waste. As a result, even if the application roller A rotates several times and the ink 3 is supplied to the entire plate surface 7, the pattern 16 as shown in FIG.
The conventional shading areas 17 that occurred before and after the printing direction of the white areas 15 of the printing paper 14 having a
It is also possible to completely resolve printing problems such as darkening of the first half of the image.

[Effects of the Invention] Since the present invention is configured as described above, the remaining ink of the once supplied ink and the ink that is constantly supplied are kneaded, and the supplied ink is repeatedly and continuously circulated to print on the plate. It can be supplied to the plate surface of the cylinder, and the amount of supply is uniform and appropriate.
Furthermore, since the remaining ink once supplied can be reused, it can be said to be an ink supply mechanism for a printing press using a novel and unique method that is excellent from all aspects such as performance, economy, and practicality.

[Brief explanation of drawings]

Fig. 1 is an overall schematic explanatory diagram showing the ink supply mechanism in the printing press of the present invention, Fig. 2 is a diagram of the conventional mechanism in comparison with Fig. 1, and Fig. 3 is the conventional ink supply mechanism shown in Fig. 2. FIG. 3 is an explanatory diagram showing defects caused by the mechanism. 1, 11... Ink pot, 2... Ink, 3...
Supply ink, 4... Residual ink, 5... Remaining ink, 6, 12... Plate cylinder, 7, 13... Print surface, 14
...Printing paper, 15...White section, 16...Picture,
17...Darkness part.

Claims (1)

[Claims] 1 A geared deposition roller A that has a smaller diameter than the plate cylinder and rotates in the same direction as the plate cylinder, and a deposition roller A
A rubber roller D with a gear, which has a smaller diameter than that of the rubber roller D and rotates in the opposite direction to the application roller A; and a former roller J with a drive motor, which has a smaller diameter than the rubber roller D and rotates in the same direction as the rubber roller D;
Geared swinging rollers F and H, which have a smaller diameter than the depositing roller A and rubber roller D and rotate in the same direction as the rollers A and D, and the depositing roller A, which has the same diameter as the swinging roller F and rotate in the same direction as the respective rollers A and D. Rubber roller B rotating in opposite directions and rubber roller B
a gold roller C that has a smaller diameter than the rubber roller B and the rubber roller D, and rotates in the same direction as the rubber roller B and the rubber roller D;
It consists of a gold roller E, which has the same diameter as the gold roller C and rotates in the same direction as the rubber roller D, and each roller is rotated by the drive of the plate cylinder and the original roller J, and the gold roller E is rotated in a direction larger than the rubber roller D. Under the condition that the speed is reduced, ink is retained on the contact surface between the rubber roller D and the gold roller E,
The amount of ink is supplied to the printing plate through rubber roller D, swing rollers F, H, and forming roller A, and the ink remaining on the printing plate is fed to forming roller A and each rubber roller B, C, and D. An ink supply mechanism for a printing press, characterized in that the ink is returned to the original roller J through the ink, and kneaded with new ink in order to stably supply a uniform and appropriate amount of ink to the plate surface.