JPH0351132A - Shortened ink mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the invention is to provide an ink case, a steel film roller, a steel metering roller accessible to the film roller, an ink layer roller, an ink roller, a copying roller engaged with the film roller, An inking mechanism consisting of a finishing roller and an ink return device, which eliminates the ink section and reduces the amount of ink;
Particularly in the inid mechanism for printing with UV-inks.

Known inking mechanisms apply the ink onto the printing material from 1 to
It was not possible to achieve a constant thickness of 2 μm.

The problem underlying the invention is the development of a shortened inking mechanism for a rotary printing press without ink sections. In this inking mechanism, stenciling
), the use of a large number of rollers in order to form a constant ink layer on the rollers, without the expense of measures taken for ink placement by screws, and even during long operations. (, the ink layer can be minutely distributed.

The problem is that the dosing roller, which has a smaller circumference than the film roller, has a peripheral speed that is 3 to 10 times slower than the film roller, and this dosing roller has a circumference that is significantly larger than the circumference of this roller. The ink layer rotates in the opposite direction to the roller, and the ink layer is provided with almost no gap to the roller, and the ink layer is rotated at a peripheral speed of the roller that is 2 to 5 times faster than the peripheral speed of the film roller. It is solved by

The advantages obtained by the present invention are as follows. That is, the determination of the thickness of the ink layer is carried out exclusively by offsetting the desired ink layer 11 on the printing material by means of the only control, namely the dosing spacing adjustment between the film roller and the dosing roller, while [ All other parameters such as I-ra speed and the like remain unchanged throughout the printing process.

Other advantages result from the reduction in the number of interstitial locations in the ink layer and the constriction forces generated therein as well as the use of rollers where the ink is heated by the rows and undergoes considerable thermal expansion. This reduces changes in ink viscosity and provides stable operating conditions.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIG.

The ink mechanism consists of an ink case 11, a film roller 2, a dosing roller 3 for moving the primary color flow - its axis for changing the dosing gap 4 can be moved towards the film roller 2, and a secondary color flow. It is composed of an ink roller 6, a transmission roller 7, and a finishing roller 8 for movement. Furthermore, an ink return device is provided, and in this case, although the screw roller 9 is taken up in the embodiment, the excess ink is caused by the reaction of the ink flow, and the ink layer is returned to the roller 5.
is generated and returns to the ink case 1. This inking mechanism operates in a known manner with forward and reverse rotating rollers using different rotational speeds in a known manner.

The dosing roller 3, which is synchronized with the film roller 2, rotates the ink layer in the opposite direction to the roller 5.

The film roller 2, which has a larger diameter than the dosing roller 3, rotates particularly slowly in order to prevent excessive shrinkage of the ink in the ink case. The shrinking effect of the ink is caused by the partition plate 10 in the ink case 1 which is tilted downward.
In addition, the ink flow 11 can advantageously be restricted by being arranged on this partition.

The dosing roller 3 has a diameter significantly larger than that of the dosing roller 3, which rotates much more slowly than the film roller 2, so that the ink layer rotating in the opposite direction is rotated much more slowly than the film roller 2, in order to sufficiently avoid the occurrence of thermal friction caused by the roller 5. For the ink layer, the roller 5 is
It rotates at a significantly faster speed than the portioning roller 3.

A strong extension of the primary color flow transmitted from the dosing roller 3 is thereby achieved.

The transfer roller 7 transfers the secondary color flow to the film roller 2.
The ink layer is guided from there to or from the inking roller 6 to the roller 5.

Typically, the advantageous primary color flow and secondary color flow distribution is 85
%:15% to 95%:5%.

The starting point for calculating the rotational speed of the rollers involved is:
- to make it possible to control the quantity gap 4. If steel rollers are used as the film roller 2 and the dosing roller 37, a stable dosing gap ratio of up to 15 μm can be controlled due to the large roundness and small thermal coefficient.

However, large fluctuations in the dosing gap width due to non-circularity or expansion of the rollers have little effect on the ink flow, so it is advantageous to multiply the dosing gap width multiple times.

The continuous ink supply is determined by the rotational speed of the film roller 2, with the ink flow 11 adjusted according to the maximum ink consumption. The ink supply can be set in such a way that an ink beat forms in front of the dosing gap.

The division of the ink flow can be arbitrarily controlled by the difference in rotation between the film roller 2 and the dosing roller 3. As a result, the main part of the ink flow is guided from the dosing roller 3 to the ink layer rotating in the opposite direction to the roller 5. Ru. The ink layer rotating in the opposite direction to the dosing roller 3 having a high rotational speed, the roller 5 absorbs the ink flow under the strong elongation of the ink layer. The ink layer is formed by bringing the metering roller 3 close to the roller 5 with almost no gap.

The almost homogeneous ink layer thus produced is completely homogenized by the movement of the secondary color flow by the ink roller 6 which flattens the ink layer at the same time and by the subsequent finishing roller 8, and the ink layer is moved from roller 5 to It is transmitted to the impression cylinder that is not in use.

As a result of the experiment, in order to make the ink layer as homogeneous as possible, film roller 2, metering roller 3 and ink layer were moved by roller 5.
The circumferential speed of V1=l:V2=0.1~0.2: V
3 = 2.0 to 2.5 (7) It was found that there is a relationship.

As can be seen in FIG. 2, adjusting the dosing gap to 1100a results in ink application on a printing material with a thickness of approximately 2.03 μm. As a result of back calculation, small changes in the ink layer thickness of Printing H Murakami can be made by relatively large changes in the setting of the dosing gap, so even if the dosing gap is roughly adjusted, the ink layer thickness on the printing material It has been found that the thickness of the layer can be finely modified.

The adverse effect of the ink that was not transmitted from the roller 5 onto the impression cylinder becomes almost zero due to the arrangement of the dosing roller 3 that approaches the roller 5 with almost no gap, and the ink layer is reduced to almost zero due to the ink not being transferred from the roller 5 to the impression cylinder. The quantity roller 3 is the ink layer, and the ink layer is the roller 5.
Scrape off any remaining ink. Depending on the embodiment, the scraped ink is passed through a screw roller 9 which is provided with a screw or screw extending from the inside to the outside, in the opposite direction to the dosing roller 3, and the ink layer is removed before the gap. The ink bulge generated between the roller 5 and the dosing roller 3 is removed and discharged to the outside. This ink is then removed from the two outer rings, which are larger in diameter than the film roller 2, and returned to its original location by further removal in the ink case. Such a device allows a reaction-free reorganization of the ink layer in a homogeneous manner in each case.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the inking mechanism of the present invention, and FIG. 2 is a diagram showing the thickness of the ink layer on the roller of the inking mechanism of the present invention. Reference numerals in the figure 1...Ink case 2...Film roller 3...Dosage roller 4...・Quantity gap 5... Ink layer is roller 6...
...Ink roller 7...Transmission roller 8...Finishing roller 9...Threading roller]O... ...Partition plate 11...Ink flow

Claims (5)

[Claims] (1) Ink case (1), steel film roller (2)
), a steel dosing roller (3) accessible to the film roller (2), an inking roller (5), an inking roller (6)
), the copying roller (7) engaged with the film roller (2)
), a finishing roller (8), and an ink return device. Compared to 3~
The circumferential speed is 10 times slower, and this dosing roller (3) rotates in the opposite direction to the inking roller (5), whose circumference is significantly larger than that of this roller, so that there is almost no clearance with respect to the inking roller (5). An inking mechanism characterized in that the circumferential speed of the ink forming roller (5) is 2 to 5 times faster than the circumferential speed of the film roller (2). (2) The peripheral speeds of the film roller (2), dosing roller (3) and ink form roller (5) are 1:0.2:2.
5. The inking mechanism according to claim 1, wherein the inking mechanism has the following relationship. (3) The spiral roller (9) as an ink return device has a worm and an edge plate whose teeth face each other from the inside to the outside, these worms and edge plates being connected to the outer ring of the film roller (2) and the edge plate. The spiral roller (9) is engaged with the scraping section along the ink case and the dosing roller (3)
Claim (1) characterized in that it is provided along
).The inking mechanism described in ). (4) A partition plate (10) is provided on the ink case (1) that slopes downward toward the film roller (2), and an ink spatula (11) is further provided on this partition plate (10). The inking mechanism according to claim 1, characterized in that: (5) Inking mechanism according to claim 1, characterized in that the inking roller (6) is used to transfer the secondary color stream to the inking roller (5).