JPS60155464A - Ink distributing apparatus - Google Patents

Abstract

PURPOSE:To enable automatic supply of ink to a distributing roller in an offset press by making the rotational speed of the first ductor slower than the second one during the supply thereof while faster during the printing to adjust the feed of ink. CONSTITUTION:During the printing, the first ductor 11 rotates faster than the second ductor 12 to make ink on the ductor 12 less than that on the ductor 11 so that the amount of ink is kept constant unless the circumferential velocity ratio is changed and hence, a fixed amount of ink can be always fed onto an original plate through distributing cylinders 17-19 and form roller. On the other hand, during the supply of ink in the inking process, the first ductor 11 rotates slower than the second ductor 12 to increase ink on the ductor 12 and hence, the inking process can be finished in a relatively short time. Thus, automatic supply of ink to the distributing rollers can be done by increasing or decreasing it respectively during the supply thereof and during the printing in the inking process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink kneading device for a printing press.

In a so-called offset printing machine, there is a plate cylinder on which the original plate is mounted, a transfer cylinder to which the ink image of the original plate on the plate cylinder is once transferred, and a pressure that presses against the cylinder to print the printing paper fed in. It is mainly composed of a torso. By the way, ink kneaded to a predetermined property by an ink kneading roller is applied to the above-mentioned original plate via an inking roller, and ink is not supplied by this type of ink kneading device, so to speak, an ink supply device. Conventionally, this was done as follows.

That is, in FIG. 1, ink is supplied to an ink pot 3 formed between a doctor blade 1 made of an elastic plate and a duct roller 2, and is intermittently rotated in the direction of the arrow while being kneaded into a predetermined property. The ink on the circumferential surface of the duct roller 2 is transferred to a calling roller 5 that reciprocates in the direction of the arrow around a shaft 4, and is further applied to an ink mixing roller 6 by this calling roller 5. Then, the ink is further kneaded by another roller 7.8 that constitutes a series of ink kneading rollers together with the kneading roller 6, and applied onto the original plate as an ink supplying body via an inking roller. Ru. By the way, the ink supply amount is adjusted to be larger during the inking process than during printing, and this adjustment is done by appropriately rotating the adjusting screw 9 to adjust the gap between the doctor blade 1 and the duct roller 2. This was done by changing the adjustment screw, but this type of adjustment method requires rotational operation using an adjustment screw.

The work was really troublesome.

The present invention has been made in view of the above points, and an object of the present invention is to provide an ink mixing device that can automatically adjust the amount of ink supplied.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.
In the figure, a pair are in contact with each other. The first and second duct rollers 11.12 are connected to both side plates 20 (the other not shown) of the printing press as shown in FIG. It is rotatably supported. Said first and second duct 1-roller 11.12
An ink supply section 1 is located above the contact portions that contact each other.
5 is formed, and printing ink 16 is supplied to the group 15. An ink mixing roller 17 is in contact with the lower right side of the circumferential surface of the second duct roller 12.
and kneading rollers 18 and 19 that are in contact with each other form a series of ink kneading roller groups, and the ink kneaded by the first and second duct rollers 11 and 12 is further processed by the ink kneading roller group to a predetermined level. The ink is kneaded into a specific state and supplied to the original plate wound on the plate cylinder via an inking roller (not shown).

In FIG. 3, the second duct roller 12 is rotationally driven in the direction of arrow A by a rotational drive system of a series of inking rollers 17, 18, 19 or by an independent rotational drive. Further, the rotational speed of the other first duct roller 11 in the direction of arrow B can be changed by a DC motor 21 equipped with a so-called variable resistance circuit. In addition, as such a speed change means, a servo motor, a well-known mechanical speed change device, etc. may be used. In this way, the first duct roller 11 is configured to be able to change speed relative to the second duct roller 12. The first duct roller 11 is configured to rotate slower than the second duct roller 12 while supplying ink in the inking process, and rotates slower than the second duct roller 12 when printing is performed. It also rotates faster. In addition,
The most suitable circumferential speed ratio of the first and second duct rollers 11.12 during printing is 10 to 1.3:1.

Here, in FIG. 2, for convenience of explanation, it is assumed that the first
Considering that the second duct rollers 11 and 12 rotate at the same circumferential speed, the ink 16 is
While being kneaded at the contact part between the rollers 1 and 2,
An equal amount of ink layer is formed on each peripheral surface of 1.12. Next, assuming that the circumferential speed of the second duct roller 12 is 1 and the circumferential speed of the first duct roller 11 is 1.3, the rotation speed of the first duct roller 11 is high, so that the roller 11 is On the same day, the ink on the circumferential surface of the roller 12 is scraped off while slipping occurs between the roller 12 and the roller 12. As a result, there is less ink on the circumferential surface of the second duct roller 12 than if both rollers 11.12 were rotated at the same speed.

On the other hand, since the rotational speed of the first duct 1 to the roller 11 is faster, the amount of ink on the roller 11 increases accordingly.

In this way, although the amount of ink on the circumferential surface of the second duct roller 12 is smaller than that of the first duct roller 11, as long as the circumferential speed ratio is not changed, the amount of ink on the circumferential surface of the second duct roller 12 remains constant and is transferred to the next ink mixing roller 17. During printing, a constant amount of ink is always supplied onto the original plate via other ink mixing rollers 1B, 19 and inking rollers that operate together with the ink transfer roller.

By the way, while printing is being performed, the amount of ink is adjusted as described above, but when supplying ink during the inking process, the first duct roller 11 rotates slower than the second duct roller 12. Therefore, the second
The amount of ink on the circumferential surface of the duct roller 12 increases, and in this state, a relatively large amount of ink is transferred to the ink mixing roller 17.
．． Therefore, the inking process can be completed in a relatively short period of time. On the other hand, during printing, the first duct roller 11 rotates faster than the second duct roller 12.

The amount of ink on the second duct roller 12 is reduced and is less than when the ink is supplied, and a corresponding amount of ink is supplied to the ink mixing roller.

Now, suppose that during printing, the circumferential speed ratio of the first and second duct rollers is 3:1, and while this circumferential speed ratio is kept constant, the first and second duct rollers are By changing the pressure or gap, the amount of ink supplied to the ink mixing roller can be adjusted. More specifically, the circumferential speed ratio is selectively set to 3:1, for example, and the ink supply amount is first roughly adjusted, and then the ink supply amount is finely adjusted by changing the pressure or gap. do. In this case, for example, if the gap is made larger, the amount of ink supplied will naturally increase, and if it is made smaller, the amount of ink supplied will be decreased. Therefore, coarse adjustment and fine adjustment can be performed freely, which is extremely advantageous in adjusting the image of printed matter.

As described above, according to the present invention, it is possible to provide an ink kneading device that can increase or decrease ink and automatically supply it to the ink forming roller during ink supply in the inking process and during printing.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a conventional ink kneading device, Fig. 2 is a front view showing an ink kneading device according to an embodiment of the present invention, and Fig. 3 is a perspective view showing a duct roller pair and its drive mechanism in the same device. It is a diagram. 11...First duct roller, 12...Second duct roller, 16...Ink, 17...Ink kneading roller.

Claims (1)

[Claims] 1. In a printing machine configured to supply ink kneaded by an ink mixing row to an ink supply object, a pair of first duct roller and second duct roller are mutually connected. While supplying ink to the upper side of the contact part,
The second duct roller is brought into contact with the ink mixing roller, and the rotation speed of the first duct roller is made slower than that of the second duct roller during ink supply in the inking process, and the rotation speed of the first duct roller is set during printing. The ink kneading device is characterized in that the amount of ink supplied to the ink kneading roller side is adjusted by setting the speed of the second duct roller faster than that of the second duct roller. In a printing machine configured to feed a supply body, on the upper side of a contact portion where a pair of first duct roller and second duct roller come into contact with each other. While supplying ink, the second duct roller is brought into contact with the ink mixing roller, and the rotation speed of the first duct roller is made slower than that of the second duct roller when ink is supplied in the inking process, and the rotation speed of the first duct roller is made slower than that of the second duct roller during printing. The rotation speed of the first duct roller is made faster than that of the second duct roller, the rotation speed ratio of both rollers is arbitrarily and selectively kept constant, and the pressure or gap between the first duct roller and the second duct roller is increased. An ink kneading device characterized in that the amount of ink supplied to an ink kneading roller side is adjusted by arbitrarily changing .