User Guide

M10

SR9

SR10

Cassette pick-up roller

Cassette feed roller

Cassette separation roller

Cassette pick-up roller

Lifting plate

Lifter

DC controller PCB

LIFTER MOTOR DRIVE signal

PAPER STACK SURFACE

signal (CSTPS)

CASSETTE PAPER signal

(CSTPE)

Pick-up positionPick-up position

Figure 5-38 Media lifting

Multiple-feed prevention

This MFP uses the paper separation roller method to prevent multiple feeds. The cassette paper

separation roller rotates in the same direction as the cassette feed roller. The paper separation roller

is imparted with a rotational force, transmitted through the torque limiter. If a multiple feed occurs, the

second paper is pushed back to the cassette and only one sheet is fed into the MFP.

Normally, the cassette paper separation roller is imparted with a rotational force in the same direction

to the cassette feed roller. However, since the paper separation roller touches the feed roller, driving

torque from the feed roller brings the torque limiter functions. The torque limiter shuts the rotational

force from the separation roller. The paper separation roller follows the rotational direction of the feed

roller, in the opposite direction. When the paper is not multiple-fed, the driving force from the feed

roller transmits through the single paper and allows the paper separation roller to rotate in the

opposite direction.

During a multi-feed, the rotational force of the cassette feed roller transmitted to the cassette paper

separation roller becomes weak because of the low friction between the sheets. The torque limiter

does not function and the paper separation roller rotates in the direction of the drive gear, causing

202 Chapter 5 Theory of operation ENWW