GTO52 5-Color Offset Gripper Problem

Discussion in '4-Color Offset Presses +' started by DonChan, Jan 30, 2018.

  1. DonChan

    DonChan Member

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    Good day,

    I'm just new here I hope you could help me in my problem. We are experiencing a gripper problem in our machine. There are times that the gripper would damage the paper or tear the paper when printing.

    How can we solve this problem?

    Thank you
     
  2. Abhi

    Abhi Member

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    Where is the tear happening? Swing gripper or impression grippers?
     
  3. DonChan

    DonChan Member

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    Impression Grippers Sir Abhi.
     
  4. junker1984

    junker1984 Senior Member

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    Swing gripper to impression or impression to first transfer?
     
    Abhi likes this.
  5. DonChan

    DonChan Member

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    impression sir I will check if either in the first unit or in other unit. I only see when the paper is already finished printed.
     
  6. turbotom1052

    turbotom1052 Senior Member

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    If this issue shows itself on every sheet you can do a hard stop of the press while its printing at production speed. If you've got a tight brake the press should stop within a single revolution. You can then open up the gate and have a visual of just where the tear is occurring.
     
  7. DonChan

    DonChan Member

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    Sir we check the machine and it showed that the grippers are out of tune. We manually calibrate the grippers some materials are good but when we print solid colors thats the time the tearing appears again. Do you have any idea or tools that we could buy so that the grippers could be calibrated all the same?

    Thank you.
     
  8. DonChan

    DonChan Member

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    Sir we check the machine and it showed that the grippers are out of tune. We manually calibrate the grippers some materials are good but when we print solid colors thats the time the tearing appears again. Do you have any idea or tools that we could buy so that the grippers could be calibrated all the same?

    Thank you
     
  9. junker1984

    junker1984 Senior Member

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    Do yourselves a favor and pay someone who knows the proper steps. And has the tooling.
     
  10. DonChan

    DonChan Member

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    We already paid two technician to do it for us yet the problem still exist and they themselves don't have proper tools. that's why I'm looking for tools that could help me calibrate the gripper. You could help me by sending me a photo or supplier where I could buy a tool/s that could help me calibrate the gripper that would be a big help for me.

    Thank you.
     
  11. contractor

    contractor Member

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    Hi don chan the tooling required for gto are a degree wheel, shaft, zero guage and a service manual to get all the correct timings. You can't buy these at a shop they are heidelberg tooling not for sale to the public. If the Techs you got in aren't ex heidelberg they won't have the tooling or knowledge. You could do check on the cam follower to see if it's worn or seized.
    Good luck
     
  12. DonChan

    DonChan Member

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    Thank you sir.
     
  13. John Van Hoorn

    John Van Hoorn Member

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    If a single gripper is set incorrectly to the point of ripping the sheet you should be able to see the discrepancy by eye. Can you?
     
  14. Abhi

    Abhi Member

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    clean and lube your grippers.
     
    Last edited: Feb 9, 2018
  15. Abhi

    Abhi Member

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    Before tuning the grippers, be sure that they're out of tune at the first place.
     
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  16. DonChan

    DonChan Member

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    Thanks for your reply. I will try your recommendations.
     

  17. PARASURAMAN

    PARASURAMAN Member

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    Hi where r u from....I m from New Zealand how old is the machine....look from the start...of swing arm as where its tearing timing is problem....get set the timing should be good....need degree wheel .....are ex heidelberg man who can fix....
     
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