Canon GP335 Service Manual page 199

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b. Operations

The horizontal registration sensor (PS10) checks home position when 24 VDC is supplied (i.e.,

when the main power switch is turned on, the front cover is closed); the sensor starts to move when

paper is fed to the lower feeding assembly, and remains in wait at the detection start position.

When paper from the lower feeding assembly reaches the vertical path paper sensor (PS11), the

horizontal registration sensor shift motor (M9) turns on, and the horizontal registration sensor

(PS10) starts to check the trailing edge of paper (each time pick-up occurs in the lower feeding

The detection start position differs according to the size of paper, and it is about 10 mm from

the trailing edge of paper (assumed to move in an ideal path). The detection start position is

determined by the cassette size and the slide guide of the multifeeder.

Figure 7-133 shows the sequence of operations used when detecting the rear/front registration.

Lower feeding

Re-pick up paper

sensor (PS9)

Vertical path

sensor (PS11)

Vertical path roller

clutch (CL3)

Horizontal registration

sensor shift motor (M9)

Horizontal registration

sensor (PS10)

registration

sensor (PS10)

*1: When the light -blocking plate is not present, detects the edge of paper and contact of the

sensor against the rear.

*2: SP differs since different paper sizes have different paper end positions.

HP: Horizontal sensor home position.

SP: Horizontal sensor detection start position.

Main power switch ON

Figure 7-133

CHAPTER 7 PICK-UP/FEEDING SYSTEM

Re-pick up started

10 mm (approx.)

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