JPH01105741A - Wetting water supply method of printer - Google Patents

Abstract

PURPOSE:To enable wetting water to be used in both cases where the quantity of ink is large, and where it is small by supplying water to a plate cylinder through a watering roller when ink consumption is large, and supplying wetting water squeezed out to the plate cylinder through an ink leveling-off roller and an inking roller when ink consumption is small. CONSTITUTION:When the consumption is small, a watering roller 15 is removed from a bracket, and instead, a bracket with a water transfer roller 21 of larger diameter than the watering roller 15 is rotated upward. Then the water transfer roller 21 is allowed to come into contact with an ink leveling-off roller 17. Under this setup, water on the water transfer roller 21 which is transferred through a water leveling-off roller 14 to which water is splashed by a splashing roller 13, is supplied to a plate cylinder via the ink leveling-off roller and an inking roller 18. At that time, the water supply to the plate cylinder 16 is small because the surfaces of the ink leveling-off roller 17 and an inking roller 18 are covered with oily ink. Consequently, characters or pictures are printed without blurring.

Description

[Detailed description of the invention] [Technical field to which the invention belongs] The present invention relates to a method for supplying dampening water to a printing press.

[Prior Art] As an example of a dampening water device for an offset printing press, there is a conventional dampening device shown in FIG. The water in the water boat 11 is pumped up by the rotating water release roller 12, and the water adhering to the surface of the water release roller 12 is removed by the brush roller 13, which rotates with its tip in contact with the circumferential surface of the water release roller 12. The paper was blown onto the circumferential surface of the printing roller 14 and further supplied to the plate cylinder 16 via the swimsuit roller 15. Note that the ink is smoothed by the ink leveling roller 17.
The ink is supplied to the plate cylinder 16 via an ink forming roller 18. With this method, there are few problems when the amount of ink is relatively large, such as when printing in color, but when the amount of ink is extremely small, such as when printing text or spot printing, the water cannot be squeezed out completely and there is too much water. However, the printing quality was poor due to blurred characters and stem patterns.

[Object of the Invention] The present invention was made in view of these drawbacks, and its purpose is to provide a dampening water supply method for a printing press that can be used both when the amount of ink is large and when the amount of ink is small. It is about providing.

[Structure of the Invention] The present invention has the following means to solve the above problems of the invention.

A water brewing roll whose bottom surface is immersed in a water boat is rotated, and the water film on the water brewing roller is scattered through a rotating brush, forming water droplets on the water leveling roller, and passes through multiple rollers to form a water film on the plate cylinder. In a method for supplying dampening water to a printing press, when a large amount of ink is used, water is supplied from the dampening roller to the plate cylinder via the dampening roller, and when a small amount of ink is used, By swinging the swimsuit roller around the water leveling roller, replacing the swimsuit roller with a water transfer roller having a larger diameter than the swimsuit roller, and bringing the water transfer roller into contact with the ink leveling roller. The dampening water is squeezed and supplied to the plate cylinder via the ink leveling roller and the ink forming roller.

[Example] As described above, the dampening water supply method of the present invention can be used both when the amount of ink used for printing is large and when the amount of ink is small. It is attached to a rotatable bracket (not shown) around the rotation center of the water leveling roller 14.

Therefore, if the amount of ink used for printing is large, the first
The roller arrangement shown in the figure is used, and when the amount of ink is small, the dampening solution is optimized by switching to the roller arrangement shown in Fig. 2.

Note that the case where the amount of ink is large is the same as that shown in FIG. 1 showing "prior art", so the explanation will be omitted.

The case where the amount of ink is small will be explained with reference to FIG. 2 showing one embodiment. Remove the swimsuit roller 15 from the bracket and replace it with a water transfer roller 2 with a larger diameter than the swimsuit roller 15.
The bracket to which 1 is attached is rotated upward to bring the water transfer roller 21 into contact with the ink leveling roller 17. By doing this, the water on the water transfer roller 21 that has been splashed by the brush roller 13 and transferred via the water leveling roller 14 is supplied to the plate cylinder via the ink leveling roller 17 and the ink forming roller 18. Ru. At this time, since the surfaces of the ink leveling roller 17 and the ink forming roller 18 are covered with oil-based ink, only a small amount is supplied to the plate cylinder 16.

Therefore, it is possible to print characters and pictures without blurring them.

In the above explanation, by rotating the bracket with the swimsuit roller 15 attached and letting the swimsuit roller 15 pass the ink leveling roller 17, the swimsuit roller 15 can be replaced with a water transfer roller 21 having a larger diameter. can do.

[Effects of the Invention] As explained above, the method for supplying dampening water to a printing press according to the present invention includes only making the bracket supporting the swimsuit roller rotatable, or using a water transfer roller having a diameter larger than the swimsuit roller together with the bracket. This configuration only requires the preparation of . With this configuration, it can be used both when the amount of ink is large and when the amount of ink is small, so the cost is low, and the operation is easy as all you need to do is simply rotate the bracket or replace the roller. etc. Its utility value is great.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional example and an example of an aspect of the present invention, and FIG. 2 is a side view of an example of another aspect of the present invention.

Claims (1)

[Claims] A water brewing roll whose bottom surface is immersed in a water boat is rotated, and the water film on the water brewing roller is scattered through a rotating brush, forming water droplets on the water leveling roller, and passes through multiple rollers to form a water film on the plate cylinder. In a method for supplying dampening water to a printing press, when a large amount of ink is used, water is supplied from the dampening roller to the plate cylinder via the dampening roller, and when a small amount of ink is used, By swinging the swimsuit roller around the water leveling roller, replacing the swimsuit roller with a water transfer roller having a larger diameter than the swimsuit roller, and bringing the water transfer roller into contact with the ink leveling roller. A method for supplying dampening water to a printing press, wherein the dampening water is squeezed and supplied to the plate cylinder via the ink leveling roller and the ink forming roller.