Product

• Lotem^® 800 (with Omron^® interlocks)
• Lotem 800 II

Background

Over the course of time, the two sets of rollers located on the unloading tray (p/n 507F3E710A) wear down and occasionally their shafts snap. When either of these scenarios ocurrs, the rollers must be replaced.

Requirements

Procedure

To replace the unload rollers, do the following:

1. From the Lotem Controller, open the platesetter's rear door.
2. Disconnect the air supply leading to the platesetter.
3. Remove the rear upper panel.
4. Remove the platesetter's unloading tray. Take care when disconneting the piston hose and the connectors. Place the tray on a work table.
5. Release the belt tension mechanism by removing the four screws that hold it in place:

   
   

6. Remove the two nuts securing the two sprocket wheels:

   
   

7. Extract the two C-clips from behind each of the two sprocket wheels:

   
   

8. Extract the sprocket wheels from the external shaft. If necessary, use a gear puller:

   
   

9. Using a flat screwdriver, remove the C-clips and spacer from the GTO arm:

   
   

10. Remove the two screws on the support bracket:

    
    

11. Remove the screws connecting the vertical support from the horizontal support:

    
    

12. Pull out the vertical support together with the inner roller and then extract the sprocket wheel:

    
    

13. Align the pins with the opening on the bracket and then slide out the roller:

    
    

14. Remove the old bushings from the rollers.
15. Install the new rollers on the unloading tray:

    
    

16. Re-install (but do not secure) the inner sprocket onto the inner roller.
17. Re-install the support bracket.
18. Using Loctite 242, re-insert the screws you removed in steps 10 and 11.
19. Re-install (but do not secure) the external sprocket.
20. Using Loctite 242, secure each of the inner and external sprockets with a locking washer and nuts.
21. Re-install the belt:

    
    

22. Apply Loctite 242 to the ends of the belt tension mechanism screws and securely tighten them.
23. Re-install the two C-clips onto the rollers:

    
    

24. Re-install the C-clips onto the GTO arm:

    
    

25. Lift up the tension wheel and place the tension jig (p/n 518-00321A) underneath the wheel:

    
    

    The jig supports the tension wheel and the jig's spring will set the belt tension to approximately 1.5 Kg.

26. Replace the four belt tension mechanism screws you removed in step 5. Gradually tighten each screw, working in a cross direction:

    
    

27. Remove the jig.
28. Re-install the the unloading tray into the platesetter as follows:
    • Reconnect all the screws, the air hose and the electrical connectors.
    • Reconnect the air supply, making sure that the GTO arm is in an upright position.
    • Replace the platesetter's rear panels and then close the rear door.

Test

Unloading several different plate sizes. Make sure the platesetter reaches Ready Mode each time a plate is unloaded.

Technical contact(s)

Itai Peperovich

Date submitted

12 Nov 2003