Sharp AL-840, Digital Copier, AL-800 service manual Paper release operation

Page 9

(Paper release operation)

Notch

Lower frame

Lock lever arm

Lock lever

Spring

Paper feed tray

Paper release lever

Paper feed roller

Paper feed clutch

Clearance

The lock lever arm is always pressed onto the paper release lever by the spring. When the paper release lever is pulled toward you, the lock lever arm is brought into contact with the lower frame so that the paper pressure plate is fixed at the paper release position. Under this condition, a clearance is provided between the paper feed roller and the paper feed tray as shown in the figure below, and the paper is released.

Paper release lever

Sub release lever

Paper plessure plate

Lock lever arm

(A)

Paper feed roller gear

Paper release lever

Paper feed clutch

(Paper fixing operation)

When the paper release lever is pushed down, the paper release lever arm pushes the lock lever arm in the direction of arrow (A).

By the above operation, the rotating disk is lifted and the paper is pushed by the paper feed roller.

If printing is made without pushing down the paper release lever, the lock lever arm is pushed by the paper feed roller gear boss in the direction of arrow (A) and the paper feed tray is pushed to fix the paper.

*Paper feed roller, paper feed solenoid

Paper feed solenoid

Paper feed clutch

The paper feed solenoid is used to turn ON/OFF the paper feed clutch. When the paper feed solenoid is turned on, the paper feed roller is rotated.

ON

Paper feed roller

paper feed clutch

A

 

The paper feed clutch is a spring clutch. The paper feed roller gear rotation is transmitted to the paper feed roller only in the direction of

(A). That is, the paper feed roller is rotated only in the direction of (A) (paper feed direction).

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Contents Model AL-800/840 Operating Principle High voltage power PWB Fusing/paper exit sectionPower PWB Scanner read sectionCopy mode Paper path and imagingImage process and data flow Printer mode Data Flow DiagramOutline Paper feed, paper transport sectionMajor parts PUSPUS PE Sensor PempPIN Sensor Paper SizeOperation Paper release operation Scanner reading section CCD CCD OUT MhpsCCD SensorAsic IC8 Mcupcu PWB Wiring diagramScanner writing section Block diagramSync Mcupcu PWB LSU PWBICU PWB Image process section Image forming process diagram OPC Photoconductor sectionDevelopment section Transfer/separation section CPU IC5 System diagramDeveloping unit Photoconductor drum unitTransfer charger roller Separation electrodeActual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential OPC drum surface potential and developing biasFusing/paper exit section ModelRTH Hlon HLL AC PowerComp AMP CN2Drive section Wiring diagramAsic CPU IC5 MEN MMT0 MMT1Major sections operations and functions Electrical sectionHigh voltage power PWB Power PWBCopy lamp control PWB Operation PWB Copyright 1998 by Sharp Corporation
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