[xxyyzz97]

What is the function of the oscillating ink roller?
Why the press vendor need to provide the adjustment of this roller in width and position of the return match the plate cylinder position?
In the old days, press operator would change the sweep width and position quite often.
The function of the oscillator is to make the ink applied from the ink fountain to ink roller become more even.
Each ink zone width (in Heidelberg press) is 32.5mm, the max. sweep width of the oscillator is 35mm. So we always find that the ink key position of an individual ink key would be affected by the ink key value next to it (having two ink key - left and right).
Normally, if the job is having large ink coverage, then the sweep width would be set to max. width. For less ink coverage job, the sweep width would set to as small as possible. In some rare case, even turn off the oscillation.
I did not know, nowadays, not many press operator would try to analyze the total ink coverage and adjust it accordingly.
Normally the position of the return would be set at the nip area. However, why the design allow the adjustment there? The oscillator would travel in horizontal direction. One return trip is the same as the plate cylinder having two turns (printed two sheets). At the end of the each direction, the speed of the oscillator is ZERO. At this moment the effect on the ink evenness is the worst. The speed of the oscillator is keep on changing during the traveling. At the end of the journey, the speed is zero, then the speed would be increased when towards center, from the center to the other end, the speed would be decrease and reach zero at the other end. The effect of the ink evenness would be the best in certain part of the movement.
Sometimes, press operator will change the position, the change would be according the content of the print job. For example, if a job having a important area at the certain area. The operator would change the position of the oscillator and place the most evenness ink area to that place to make the important part having the most evenness ink.

[xxyyzz97]

作者: Bloodsaler

想问问xxyyzz97老大，是串墨辊正向转一周，印版滚筒即转了两圈是吧？从你字里行间我是这样理解的。
至于调整串墨辊的位置来适应活件需要，安排油墨碾平最好的区域对应活件相应区域，我想问问串墨辊所调整的是哪个方向？哪位老大能详细讲讲这种调整是怎样调整么？
而且对应的印版上的区域有没有特定位置的要求？需要对应于印版中心还是说不同位置通过调整串墨辊都可以对相应位置有很好的油墨碾平？

I mean that the oscillator from the very left side travel across to right side, the plate cylinder would turn on turn. Then the oscillator return from right to left then the cylinder would turn another turn. So for a round travel of oscillation, the cylinder will turn 2 times.
Originally I have a layout to show the describe the ink evenness distribution, but I cannot find it. The starting point of the oscillation, for example, in normal setting, the starting motion of the oscillator should at the nip area, because at this position, there is enough printed. Now the most important part of the job is very close to the gripper, in order to get the most even film at this part, then we need to adjust the starting position of oscillation, at this moment which will not start at the nip area.
The modern press using the drive motor installed at the oscillator assy. Operator can change the position from the console.
I believed that your KBA C215 should have this feature.
You can adjust the starting position of oscillator at at place, there is no limitation or only set at a few places.