What are the causes of this problem

Discussion in 'Heidelberg Printing Presses' started by ali 120, Nov 24, 2023.

  1. ali 120

    ali 120 Member

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    What are the causes of this problem or is this normal?
    When the pressure in the blanket cylinder increases
    The distance between the blanket cylinder holder and the plate cylinder holder is reduced
    Note that the use of this indicator has no relationship between the plate cylinder and the blanket cylinder
    https://www.raed.net/file?id=498898
     
    Last edited: Nov 24, 2023
  2. Raf77

    Raf77 Senior Member

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    It is ok pal
     
  3. ali 120

    ali 120 Member

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    What you mean is that the increase and decrease that occurs between the blanket cylinder holder and the printing cylinder holder is very normal with the movement of the paper press indicator.
     
  4. Raf77

    Raf77 Senior Member

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    By increasing impression you decrease the gap between blanket and impression cylinders. And when you decrease the impression you increase the gap
     
  5. ali 120

    ali 120 Member

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    But what I know is that the increase in impression has nothing to do with the blanket cylinder and the impression cylinder, because each of them has a different path from the other.
     
  6. Raf77

    Raf77 Senior Member

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    So HOW do you increase impression???
     
  7. ali 120

    ali 120 Member

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    I mean that increasing the impression index has to do with the paper and has nothing to do with increasing or decreasing the gap between the blanket cylinder and the cylinder above it.
    Because each of them is separate
     
  8. Raf77

    Raf77 Senior Member

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    I give up:(
     
  9. Raf77

    Raf77 Senior Member

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    Look, you're printing job on 0.06 paper. Your next job is on 0.5 board. What are you doing?
     
  10. ali 120

    ali 120 Member

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    I mean between the two holders marked with blue arrows
    When I increase the index, the impression on the paper increases, the gap between the two marked holders decreases
    When the indicator is reduced, the gap between the two carriers marked by blue arrows increases
    https://www.raed.net/img?id=499446
     
  11. ali 120

    ali 120 Member

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    I ask you to be patient
    Because I am not good at English
    Also, the terminology you use is not the common terminology in my country
     
  12. Raf77

    Raf77 Senior Member

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    I'm more patient than ever mate :D

    So, there should be no gap between plate and blanket bearers during printing. These cylinders are printing bearer to bearer.
    The gap should be between blanket and impression cylinders - that gap is depend on paper thickness - thicker paper - bigger gap.

    Can you put measuring gauge between plate and blanket bearers when impression is engaged?
     
  13. ali 120

    ali 120 Member

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    Should I do something like in the video?
    The filler used is 0.10%


    There are those who say that feeler gauge 0.50 mm should be placed between the blanket cylinder holder and the painting cylinder holder.
    The machine is in non-printing mode
     
  14. Raf77

    Raf77 Senior Member

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    If impression is disengaged (non printing mode) there should be a gap between plate and blanket bearers. Otherwise image would be transferred to the blanket all the time.

    But let's start from the beginning - have you got any issues with printing, or you just concerned about how big gap should be?
     
  15. ali 120

    ali 120 Member

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    There is a problem printing
    I made a topic about it
    When the paper is put to print for a second cycle, there will be dark and light colored paper
    First, I want to check the level of the blanket and between plate
     
  16. Raf77

    Raf77 Senior Member

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    Oh yes now I remember. That may be nothing wrong with the machine. Have you taken that picture of whole sheet?
     
  17. ali 120

    ali 120 Member

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    Unfortunately, I did not find a photo of the entire paper
    But I will pick it up and send it to you
    I want another request from you
    Is there a catalog for how to adjust the blanket cylinder holder with the cylinder holder above it?
    https://www.raed.net/img?id=499702
     
  18. mantman

    mantman Senior Member

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    The dial you turn is for impression ONLY. Plate and blanket is FIXED from factory and not to be tampered with!
    Take the 0.35 mm filler and put it between blanket and impression bearer ring -holder what you call it-, then engage impression turn one revolution -like putting a plate-. It should move with a slight drag. If you cant put it between bearers or it moves freely then turn the dial until you find the proper drag. After this loosen a small 3mm allen screw, take out the dial and put it to 0 position -turn by hand- put it back in tighten 3mm screw and you are ready
     
  19. Rui Pereira

    Rui Pereira Member

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    Its normal...if u know how it works the pressure on those type of press machines. Theres a single pneumátic jack do the 2 moves needed to print...1 move to the plate cilinder, the 2 move...if you increase the pressure, that means that the blanket cilinder need to be more close for the impression cilinder, but the plate cilinder automaticly adjust the vão between them...the Gap between the blanket as to BE always the same...
    IMG_20231129_183755.jpg
     

  20. ali 120

    ali 120 Member

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    When the blanket cylinder index increases
    Reduces the gap between the pallet cylinder and the blanket cylinder
     
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