Ricoh ps450 SPECIFICATIONS

PAPER TRAY UNIT

(Machine Code: B384)

20 February, 2001 MECHANICAL COMPONENT LAYOUT

1. OVERALL MACHINE INFORMATION

1.1 MECHANICAL COMPONENT LAYOUT

B384V101.WMF

1. Upper Paper Feed Roller

2. Lower Paper Feed Roller

3. Upper Tray

4. Lower Tray

5. Upper Bottom Plate

6. Lower Bottom Plate

7. Optional Tray Heater

Peripherals

B384-1

ELECTRICAL COMPONENT LAYOUT 20 February, 2001

1.2 ELECTRICAL COMPONENT LAYOUT

B384V102.WMF

1. Tray Main Board

2. Upper Lift Sensor

3. Upper Lift Motor

4. Upper Paper Height 2 Sensor

5. Upper Paper Height 1 Sensor

6. Upper Paper Feed Clutch

7. Relay Clutch

8. Tray Cover Switch

9. Lower Paper Feed Clutch

10. Lower Paper Height 2 Sensor

11. Lower Paper Height 1 Sensor

12. Vertical Transport Sensor

13. Upper Paper End Sensor

14. Lower Paper End Sensor

15. Lower Paper Size Switch

16. Upper Paper Size Switch

17. Optional Tray Heater

18. Lower Lift Motor

19. Lower Lift Sensor

20. Paper Feed Motor

B384-2

20 February, 2001 DRIVE LAYOUT

1.3 DRIVE LAYOUT

1. Paper Feed Motor

2. Drive Belt

3. Upper Paper Feed Clutch

4. Relay Clutch

B384V103.WMF

5. Lower Paper Feed Clutch

6. Relay Roller

7. Lower Paper Feed Roller

8. Upper Paper Feed Roller

Peripherals

B384-3

PAPER FEED AND SEPARATION MECHANISM 20 February, 2001

2. DETAILED DESCRIPTIONS

2.1 PAPER FEED AND SEPARATION MECHANISM

[A] [B]

[C]

B384D104.WMF

Each paper tray holds 500 sheets. The paper feed roller [A] drives the top sheet of paper from the paper tray to the copier/printer. The friction pad [B] allows only one sheet to feed at a time. The friction pad applies pressure to the feed roller with a spring [C].

B384-4

20 February, 2001 PAPER LIFT MECHANISM

2.2 PAPER LIFT MECHANISM

[B]

[A]

[D] [C]

[H]

B384D106.WMF

[E]

[C]

[D]

[E]

The paper size switch detects when the tray is pushed in.

[K]

[J]

[G]

[F]

[A]

[B]

[I]

B384D107.WMF

When the paper tray is pushed into the machine, the pin [A] for the lift motor pressure shaft engages the lift motor coupling [B] and the pin [C] for the bottom plate lift shaft in the tray engages the bottom plate pressure lever coupling [D]. The pin [E] on the rear of the tray pushes the lock lever so that the lift motor can lift the bottom plate pressure lever.

The lift motor turns on, and turns clockwise as viewed on the lower diagram. The main pressure spring [K] pulls the bottom plate pressure lever, and this lifts the tray bottom plate.

When the top of the stack touches the feed roller, the motor cannot pull up the plate any more, so it pulls the actuator [G] into the lift sensor [F].

The pressure of the feed roller on the paper is now too high, so the lift motor reverses to reduce this pressure. It reverses for 300 ms or 600 ms, depending on the paper size. For smaller paper, it reverses the larger amount (600 ms) to reduce the pressure more.

B384-5

Peripherals

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