PRESS SECTION

CONTENTS

1. Theory of Operation ...6-3 1. Press Mechanism ...6-3 2. Removal and Assembly ...6-5 1. Pressure Roller ...6-5 2. Pressure Lever Assembly ...6-6 3. Pressure Shaft Assembly ...6-7 3. Adjustment ...6-9 1. Pressure Lever Assembly Position ... 6-9

[ 6-2 ] 6-2 ] KZ30 (Rev. 1.2)

MEMO

Imagetec Solutions Australia

1. Theory of Operation

1. Press Mechanism

1. Pressure Lever and Pressure Roller

> The Pressure lever is mounted on the Pressure shaft. The Pressure roller is mounted on the Pressure assembly, which is fixed on the Pressure shaft.

> While the Main motor is making the Print drum rotation without paper (not in printing process), the Pressure hook engages with the Pressure lever so that the Pressure roller stays down.

> When paper comes in and pushes the Paper gate up, the Pressure hook rises. Then the Pressure lever is released and the Cam follower of the Pressure lever assembly touches against the Pressure cam. The Pressure roller is pushed up and hits against the Print drum to make the print.

> The Pressure spring pulls the Pressure roller up against the Print drum.

> Once the Pressure lever is released from the Pressure hook, movement of the Pressure lever is controlled by the Pressure cam.

> The Pressure roller is lowered down by the Pressure cam where the Clamp plate on the Drum comes near the Pressure roller to prevent damaging the Clamp plate.

> The Pressure hook comes down when the printing job is completed and paper is no longer fed from the Paper feed tray. The Pressure hook engages with the Pressure lever to keep the Pressure roller away from the Print drum.

Paper gate is pushed up by paper, and Pressure hook is raised.

Then the Pressure lever is raised by the Pressure cam to press the Pressure roller against the Print drum to make the prints.

Pressure roller Pressure cam Pressure shaft assembly

Pressure shaft

Cam follower

Paper gate

Pressure assembly

[ 6-4 ] 6-4 ] KZ30 (Rev. 1.2)

Lifting the Pressure Roller

The Paper gate is pushed up by paper throughout the printing.

So the Pressure lever becomes free.

The Pressure spring pulls back the Pressure lever and rotates the Pressure shaft which is acting as a pivot.

The rotation of the Pressure shaft lifts the Pressure roller up against the Drum.

Lowering the Pressure Roller

The Pressure roller is lowered by force, away from the Drum[C], by the high part of the Pressure cam.

During the Drum rotation, when the Clamp plate of the Drum comes close to the Pressure roller, the high part of the Pressure cam pushes the Pressure lever down, rotating the Pressure shaft counter-clockwise to bring the Pressure roller down, away from the Drum.

Then Pressure lever is lowered by Pressure cam.

Pressure hook rotates up when the paper comes in.

Pressure hook rotates down when the paper no longer comes.

Pressure roller

2. Removal and Assembly

1. Pressure Roller

1. Turn OFF the machine power and disconnect power cord from the machine.

2. Remove the Rear cover.

3. Remove the Print drum.

4. Remove the Suction unit.

5. Remove the Pressure spring.

6. Remove mounting screw of the Pressure roller from the Pressure shaft assembly through a hole on the drive side of the machine frame.

7. Take out the Pressure roller from the Drum opening side of the machine, or from the top of the machine after sliding the Master removal unit outward to open the top of the machine.

Screw

Pressure roller

[ 6-6 ] 6-6 ] KZ30 (Rev. 1.2)

2. Pressure Lever Assembly

1. Turn OFF the machine power and disconnect the power cord from the machine.

2. Remove the Rear cover.

3. Remove the Print drum from the machine.

4. Remove the Pressure spring.

5. Remove two set screws from the Pressure lever assembly.

6. Turn the Pressure lever in clockwise direction (Pressure lever shows up behind the gear) then remove the Pressure lever assembly from the Pressure shaft.

Adjustment after the Assembly

> Adjust the position of the Pressure lever assembly. (Refer to the adjustment section on this Chapter.)

Set screws

Pressure lever assembly

Imagetec Solutions Australia

3. Pressure Shaft Assembly

1. Turn OFF the machine power and disconnect the power cord from the machine.

2. Remove the Print drum from the machine.

3. Remove both the Front and Rear covers.

4. Remove the Pressure spring.

5. Remove the Pressure lever assembly. (Refer to the previous page)

6. Remove E-rings from both ends of the Pressure shaft assembly and remove the Bushings.

7. Remove the Suction unit.

8. Remove the Pressure spring.

9. Slide the Pressure shaft assembly towards the rear (drive side) of the machine once, and then remove it out from the Paper receiving side of the machine.

Adjustment after the Assembly

> Adjust the position of the Pressure lever assembly. (Refer to the adjustment section on this Chapter.)

Pressure shaft assembly

[ 6-8 ] 6-8 ] KZ30 (Rev. 1.2)

MEMO

Imagetec Solutions Australia

3. Adjustment

1. Pressure Lever Assembly Position

1. Make confidential master on the Drum.

2. Bring the Print drum to B-position.

3. Turn OFF the machine power and disconnect power cord from the machine.

4. Remove Rear cover.

5. Remove the Suction unit and disengage the Pressure spring.

6. Using finger, disengage the Pressure lever from the Hook lever by pushing up the Hook lever to disengage the Pressure lever.

7. Hook the Pressure lever, so that the Pressure roller hits against the Print drum.

8. Confirm that the gap between the Pressure cam and Cam follower on the Pressure lever is between 2 mm to 2.5 mm.

9. If the gap is too small or big, loosen the two set screws on the Pressure lever assembly.

10. Place 2.0 mm or 2.5 mm Allen key (or 2.0 mm to 2.5 mm thick plate) between the Pressure cam and Cam follower and push up the Pressure lever assembly against the Pressure cam.

11. While pushing the Pressure lever assembly tightly against the Pressure came with the Allen key or plate in between (refer to the above), tighten the two set screws on the Pressure lever assembly.

12. Remove the 2.0 mm or 2.5 mm Allen key (or 2.0 mm to 2.5 mm thick plate), which was inserted between the Pressure cam and Cam follower.

13. Confirm that the gap between the Pressure cam and Cam follower on the Pressure lever is between 2 mm to 2.5 mm.

If not, repeat the above procedures until correct gap is obtained.

Results of Incorrect Adjustment

> If the gap is smaller than 2 mm, the Pressure roller leaves from the Drum too early. As a result, the tailing edge of the paper may not be printed clearly.

> If the gap is too big, the Pressure roller may hit the Clamp plate of the Drum during printing and damage the Clamp plate.

2.0 mm to 2.5 mm gap Adjust the gap between the Pressure cam

and Cam follower to 2.0 mm to 2.5 mm by inserting 2.0 mm or 2.5 mm Allen wrench or plate between the Cam and Cam follower.

Rotate the Print drum to the B-position before turning the machine power OFF.

(The Print drum in the sketch is still not in Position-B.)

Pressure cam Hook lever

[ 6-10 ] 6-10 ] KZ30 (Rev. 1.2)

MEMO

Imagetec Solutions Australia