Applies to

Lotem^® 400 w/MCU small (the unit with 6 suction cups)

Priority = Next visit
Release date = 04 Jun 2003

Machines affected

Component

Paper disposal roller

Problem

During paper disposal, the bar flag on the XY bar cuts grooves into the rubber on the disposal roller. The resulting rubber ablation can cause hot spots.

Note: For Devices with the new disposal roller and the old shield, shown below, install the bar flag gap coverage.

Solution

Time needed to implement

2 hours

Parts needed

Procedure

Removing the paper disposal roller

1. Shut down Lotem Controller and turn off the platesetter.
2. Disconnect the main power supply.
3. Remove the interlock covers on both sides of the MCU.
4. On the right side of the machine, remove the three hex screws from the shield of the disposal roller that is closest to the drum.
   
5. Loosen the screw that holds the gear wheel, but do not remove the gear wheel.
   
6. Loosen the chain.
7. Loosen the screw on the motor gear wheel, and then remove the motor gear wheel.
   
8. Remove the gear wheel.
   
9. Remove the two hex screws that hold the disposal roller bearing.
   
10. Loosen, but do not remove, the two set screws on the disposal roller shaft.
    
11. Remove the bearing and the bearing housing.
12. On the left side of the machine, repeat steps 4-11.
13. Lift the disposal roller assembly out of the machine.
    
14. Slide the roller assembly out of the shield.
    

Installing the paper disposal roller (500-00315A)

Note: Make sure to use Loctite 242 on all screws.

1. Slide the disposal roller assy (small) II (500-0315A) into the new paper run out shield.

Note: Perform steps 2-6 on the right side of the machine.

2. Insert the disposal roller assembly into the machine.
3. Insert the bearing and the bearing housing, and then insert (but do not tighten) the two hex screws that hold the bearing housing. (See step 9, above.)
4. To position the roller correctly, make sure that it is exactly aligned with the other roller.
   

Note: Make sure to use Loctite 242 on the four set screws.

5. Tighten the set screw on the flat side of the shaft.
6. Tighten the two hex screws that hold the bearing housing.
7. On the left side of the machine, repeat steps 3, 5, and 6.
   Note: There is no need to adjust the roller pressure again.
8. On each side of the machine, tighten the set screw on the round sides of the shaft.
9. On each side of the machine, insert and tighten the three hex screws that secure the paper run out shield, as shown in step 4 of the previous section.
10. Install the large gear wheel and slightly tighten the two screws.
11. To adjust the gear wheel, use a caliber to measure a distance of 23 mm from the base of the frame to the edge of the gear wheel, and then adjust the gear wheel position and tighten the screws.
    
    
12. Install the motor gear wheel and slightly tighten the two screws.
13. To adjust the motor gear wheel, use a caliber to measure a distance of 20.5 mm from the base of the motor to the edge of the motor gear wheel, and then adjust the motor gear wheel position and tighten the screws.
    
14. To adjust the chain, loosen the two screws that secure the motor, loop the chain around the two gear wheels, and then tighten the two motor screws.
    Note: The chain should not be too tight or too loose.

Logistics

Test

From the PC Controller, operate the disposal motor and verify that there is no excessive noise.

Document number

Technical contact

Mario Amir

Product Support Manager: Haim Vaknin

Date submitted

30 Apr 2003