Heidelberg SM74 intermediate roller issue?

Discussion in 'Heidelberg Printing Presses' started by Kirkland, Oct 25, 2023.

  1. Kirkland

    Kirkland Member

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    Hello everyone! First time poster, casual reader here;

    I was setting rollers today as I wasn't happy with how my dampening system was washing up recently, well now after setting all rollers the inkwrs wash up beautifully and it stops at the intermediate roller and down. After further investigation when I am setting the bead between the intermediate and damp form to 3mm (as per the book) and have tried as much as 5mm to see what happens, I am getting little to almost no contact between the intermediate and my fourth ink form roller (I believe it is roller 14 in the book. Don't have it on me at the moment) which explains why the wash up is stopping at the intermediate roller. But does anybody know what could be causing the lack of contact to be happening and how to possibly resolve it? I'm stuck lol.

    I'll appreciate all the thoughts and ideas!! :)

    Thanks for taking the time to read!!
     
  2. Beguin

    Beguin Senior Member

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    picture please
     
  3. Kirkland

    Kirkland Member

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    Sorry it's not the best picture.nor colour, but I had to put the rollers back in to get a job off today. Print quality is normal. It's just wash up I'm fighting with. Intermediate roller down.
     

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  4. Adil

    Adil Senior Member

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    Hi sir
    maybe you did not select the intermediary key in the selection menu, enter the group and then on 1st or 2nd and control the intermediary selection key in automatic mode. ps: you have this problem in both printing groups??
     
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  5. Adil

    Adil Senior Member

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    Let me know please
     
  6. Kirkland

    Kirkland Member

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    P.S issue is with my first printing unit on a 2 colour press. I run non integrated when I'm printing so this issue doesn't affect the image quality, even if I select to have the intermediate roller ingaged I get the same results, my second unit washes up fine, I was thinking maybe I had an issue with the intermediate roller itself so I put the other units roller in and had same results.

    Also thanks for the reply I appreciate it! :)
     
  7. Kirkland

    Kirkland Member

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    I'm wondering if the issue may be tied to the hangers? I saw in the book it says at one point to "remove the intermediate bearing to get access to the 4th ink form" when I was being taught I wasn't shown that (I don't think anyone in our shop had even known about it to be honest) end everytime I read the book I must have glanced over it and missed it because this is the first time I've actually seen that step.
     

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  8. alibryan

    alibryan Senior Member

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    Unrelated to your roller issue but I wanted to comment on the cleanliness of your press. The SM74 has been out of production for many years now and yet yours looks close to still being new. Well done, sir, your press habits speak for themselves.
     
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  9. Kirkland

    Kirkland Member

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    Thank you! I appreciate that!! :) I've basically fully taken it over for about 1.5-2 ish years I believe. It's a 1996. Original pressman in our shop from what I heard was pretty meticulous over it, but then after he retired it went through quite a few different operators that it was just a "job" to them now that I've taken it over I've been trying to clean it back up... Lol

    Unrelated to this issue as well... But does anyone have any tips on getting old dried ink off the plastics/frame without destroying the paint? I've tried scraping the ink off and then using blanket wash and it doesn't work, I've tried just using elbow grease and blanket wash and noticed that with too much scrubbing it eats away at the finish, I've tried different chemicals in test spots like MRC and rejuvenator and that eats the finish as well... Or should I just embrace the mess and say it's just inherited character :p
     
  10. Kirkland

    Kirkland Member

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    Latest update;
    I was starting to lean towards roller 14 (4th form) being bad and that's why my intermediate roller wasn't contacting.

    But this week I've swapped roller 14 from my second unit (washes up awesome) and set all of my beads as precise as possible using a caliper to quadruple check. I had also cleaned all of my wash up nozzles to make sure none were plugged and causing a lack of solution in any of the zones. This was the end result, and that was even with me spraying a little bit of extra solution towards the damp form roller 20231108_152001.jpg

    What has gotten me scratching my head even more is I put the "bad" roller (14) into my second unit and roughly eyeballs the setting and it washed up fine :-|

    Other things I've tried have been swapping intermediate rollers around, swapping my washup blades to verify it wasn't bad, washing with plate/without.
    Also the damp form is new as of 6momths

    I'm completely stuck lol

    Could it be something to do with these? Snapchat-384966005.jpg Snapchat-1466051522.jpg

    Thanks!!
     

    Attached Files:

  11. Jack liston

    Jack liston Senior Member

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    It looks like your intermediate roller is hanging up make sure there are no burs on rods and be sure the part you showed in photo is in the proper position. Remember to drop ink forms when setting bridge. Use a strip of light paper to ensure both sides of bridge are touching ink form and water form
     
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  12. Adil

    Adil Senior Member

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    Please check diameter of your first ink form
     
  13. asem alsafady

    asem alsafady Senior Member

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    Dear Sir,
    First of all, you have to switch ON your Intermediate roller from CPtronic console.
    Run the machine and check if your springs (as in photos) are engaged without switching off your machine. Your have to check if the spring holders OS and DS engaged towards the rollers.
    Send me a feed back of what will happen.
     
  14. Kirkland

    Kirkland Member

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    Hey! I was just coming back in here to post an update! Got it solved!!!!! :) :) turns out the cylinder/valve unit under the cover was faulty and not pushing up all the way. Replaced and good to go! What a relief! :)
     

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  15. Kirkland

    Kirkland Member

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    Got it solved! I'd just like to thank everyone for their time, replies and suggestions! Much appreciated :) thank you all!!!!
     
  16. Jack liston

    Jack liston Senior Member

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    Good work make a note in your maintenance book
     
  17. asem alsafady

    asem alsafady Senior Member

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    Happy to hear that.
    You are welcome,
    Good luck.
     

  18. Rui Pereira

    Rui Pereira Member

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    Hi. I did have some problema to. Solved by performing a check up on all the dumpning sistem...check the springs, pneumátics, and if the the
    SM74....by dar the most complicated machine for setup rolets and dumpning...check the pneumátics...springs. the plate cilinder as to be in the right position...switch on the intermediar roller, switch on the ink rolets on the plate, adjust the intermediar Romer until u have a small strip (-/+ 3mm) on the 4 plate Romer (14 on the roler scheme)
     
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