Combination of crosses. SM 102 5+lac.

Discussion in 'Heidelberg Printing Presses' started by Andrei83, Sep 16, 2018.

  1. Andrei83

    Andrei83 Member

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    Beru a new job I print 10 sheets I combine the image. My rubber then I print 10 sheets and combination of crosses almost exact again, I move once again registers and I start to print circulation. And that (crosses) combination turns out especially purple color disperses, there is also a yellow cross 0,5-0,3 millimeters follow up. It is necessary to move once again registers in circulation, and after that everything is normal. If to turn off supply of paper on the last sheets combination of crosses disperses, and on a leaf on an illustration strips appear. Why?
     
  2. junker1984

    junker1984 Senior Member

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    If I understand the issue correctly, that being your circumferential register is unstable immediately after an adjustment, but improves after making additional minor adjustments, I would suggest locating the grease zerk (fitting) on the plate cylinder double gear assembly.
     
  3. Andrei83

    Andrei83 Member

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    Yes I greased there where you told, two months ago. But it didn't affect in any way. Didn't help
     
  4. junker1984

    junker1984 Senior Member

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    Alignment pin (inner gear) and bushing (outer gear) may be worn. So too, might the brass bushing on the outer gear, which is supposed to slide freely, but without play, on the journal of the inner gear.
     
  5. Andrei83

    Andrei83 Member

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    How to check it?
     
  6. junker1984

    junker1984 Senior Member

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    Probably not a task for the inexperienced. Basically, you must remove the yoke that is securing the outer gear in place. With the heavily spring loaded yoke removed, you may then examine the alignment pin and bushing, and the condition of the brass bushing of the outer gear and the journal of the inner gear. Depending on the age of the press, this may or may not be the route to go. I'm also not thoroughly convinced that I am fully understanding the problem you are experiencing, as the translation in your original message is not fully clear to me.
     
  7. mantman

    mantman Senior Member

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    My understanding is he makes perfect register and when he starts printing y tends to move backwards 0.5mm so he adjusts with circumferential movement and achieve register yet again until machine stops

    He could be refering plates sliding away from clamp bars or servo motors gone bad and move plate up and down of their own
     
  8. junker1984

    junker1984 Senior Member

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    Thanks for the clarification, Mantman. I have seen, and advised on this issue countless times over the years. Many pressmen are not aware of the grease zerk on the inner face of the outer gear of the plate cylinder drive assembly. It may be simply an issue of the brass bushing being starved for grease.
     
  9. mantman

    mantman Senior Member

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    This grease point applies for SM models only or it can be found on GTOs?
     

  10. junker1984

    junker1984 Senior Member

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    No zerk on GTO. If you're experiencing similar issue on the GTO, look for the the shouldered pin held in place by 4 6mm bolts, it may help to remove, grease and maybe turn it 180 degrees.
     

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