Dolev 800 - Loading/Unloading System -
Feeder Motor

Optomech 800P (click to see image)

Description
Replacement
Check
Feeder Shaft Adjustment Procedure
Dolev 800 Width Offsets Adjustment

Description

The Feeder Motor (#110) is located on the optomechanical assembly. It is a
bidirectional motor responsible for turning the Feeder Shaft. The feeder shaft
supplies the film to the drum. The motor is located on the right side of the
machine.

Replacement

Tools and Accessories
Disassembling the Feeder Motor
Assembling the Feeder Motor

Tools and Accessories

Flat screwdriver
Set of Allen keys
Melicot Grease
Marking pen
Masking tape

Disassembling the Feeder Motor

1. Power off the imagesetter using the control panel ON/OFF switch.
   
   
2. Open the left and right service doors.
   
   
3. Remove the light-proof cover from the right side of the unit.
   
   
4. Open the back cover of the Motor.
   
   
5. Disconnect the wires after marking them with masking tape and marker.
   
   
6. Open the four hex screws (#113,23,24) 8-32 x 5/8" holding the Motor to the base and carefully pull the Motor out.
   
   
7. Pull the motor cross adaptor (#104) out.
   
   
8. Clean the motor cross of grease with a lint-free cloth soaked in alcohol.
   
   
9. Dismantle the feeder motor torque converter (#103). It is assembled on the shaft at a distance of 2mm from the motor.

Assembling the Feeder Motor

1. Assemble the torque converter (#103) on the new motor.
   
   
2. Put a small amount of grease on the cross (#104) and put it in place.
   
   
3. Put the Motor back in place and tighten the four hex screws 18-32x5/8".
   
   
4. Reconnect the wires on the back of the motor. Use the markings used during disassembly. Close the black cover on the Motor.
   

Check

Enter the diagnostics program. Select UTILITIES, MECHANICS. Select 5. Feeder from the Mechanics Menu.

Mechanics Menu

1. Run the motor Forward and Reverse. This checks the Feeder and reads the encoders.
   
   
2. Check for smooth and noiseless operation.
   
   
3. Assemble the light-proof cover and close the side door.
   

Feeder Shaft Adjustment Procedure

Required Tools
Procedure

Required Tools

• Feeder shaft jig 280A35802
  
• Set of Allen keys

Procedure

1. Power off the imagesetter using the control panel ON/OFF switch.
   
   
2. Open the left and right service doors.
   
   
3. Remove the light-proof cover from both sides.
   
   
4. Pull out the loading system assembly so that it extends from the machine.
   
   
5. Remove the two left and two right film guides ( # 57, 58 , 61 ), by loosening the screws ( # 85 ).
   
   
6. Move the carriage to the center of the drum using the handle.
   
   
7. Using the feeder shaft jig check the adjustment of the shaft:
   The shaft should be parallel to the jig within 20 microns on both sides.
   Check that the shaft extends 200 to 250 microns into the drum.
   Check that the height is within limits on both sides - according to the jig.
   
   
8. If adjustment is needed slightly release the two screws on the right side ( # 114 ) and one screw on the left side ( # 27 ).
   
   In order to release the left screw, rotate the spreader wheel to the point that the hole is above the screw.
   
   
9. Adjust the feeder shaft as described in #7 above.
   
   
10. Lock the screws and put all the assemblies back.
    
    
11. Check the Film registration.

Dolev 800 Width Offsets Adjustment

Adjusting the Feeder Wheels Offset
Adjusting the Spreader Offset

Adjusting the Feeder Wheels Offset

(Width Offset in the Plotter Description Table)

The Width Offset parameter refers to the relevant offset from the index pulse. From this position the plotter will start positioning the Exposure data. The offset bypasses the area where the laser beam hits the pressure rollers and the mechanical elements. This parameter is measured in millimeters (mm).

In cases where the parameter is too small, the exposure will be cut by the Dolev 800 mechanical elements (pressure rollers). In cases where the parameter is too large, exposing over full format (1118mm) will cut the edges of the exposure near the spreader roller.

In order to adjust this offset, set it to 0 and load 500mm of film. Measure the distance from the film edge to the point where the exposure will start and enter this offset. Increase or decrease this value if needed. If the exposure is cut on the spreader edge, adjust this offset.

Adjusting the Spreader Offset

(Roller Offset in the Plotter Description Table).

This parameter compensates and corrects the position of the spreader roller with respect to the film (mm).

The smaller this parameter, the greater the spreader movement counter-clockwise so it may happen that the spreader will not stay on the film. The larger this parameter, the greater the spreader movement clockwise covering a larger area of the film and thus shortening the area of effective exposure.

  Adjust this parameter to the point that the spreader will stay about 5mm from the film edge (on the film).

If the exposure is cut by the spreader and the roller offset is adjusted according to the above procedure, adjust the width offset and not the roller offset.