Pick-Up/Feeding System - Canon NP6251 Service Manual

PICK-UP/FEEDING SYSTEM

This chapter explains the principles used from when copy paper is picked up to when a copy is
delivered in view of the functions of electrical and mechanical units and in relation to their timing of
operation. It also shows how these units may be disassembled/assembled and adjusted.
I. PICK-UP/FEEDING SYSTEM ............5-1
A. Outline ...........................................5-1
II. CASSETTE PICK-UP .........................5-4
A. Pick-Up Operation .........................5-4
B. Cassette Lifter Operation ..............5-6
C. Identifying the Size of Copy
Paper in the Cassette....................5-8
III. FRONT PAPER DECK ASSEMBLY......5-13
A. Outline ...........................................5-13
B. Lifter Operation..............................5-16
C. Detecting the Presence/Absence
of Paper in the Deck......................5-19
D. High-Speed Pick-Up ......................5-19
IV. MULTIFEEDER...................................5-20
A. Pick-Up Operation .........................5-20
B. Identifying the Size of Paper in
the Multifeeder...............................5-21
C. Sequence of Pick-Up Operations
(multifeeder) ..................................5-22
V. CONTROLLING THE
REGISTRATION CLUTCH .................5-23
VI. MAKING TWO-SIDED/OVERLAY
COPIES ..............................................5-24
A. Making Two-Sided/Overlay Copies
(1st side)........................................5-24
COPYRIGHT © 1997 CANON INC.
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CHAPTER 5
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
B. Making Two-Sided Copies
(2nd side) ......................................5-26
C. Making Overlay Copies
(2nd side) ......................................5-28
D. Reversal Delivery ..........................5-32
E. Switching the Paper Size for Two-
Sided/Overlay/Reversal Delivery
Copies ...........................................5-34
F. Re-Pick Up from the Holding
Tray................................................5-37
G. Skipping Operation ........................5-38
VII. DETECTING JAMS ............................5-46
A. Outline ...........................................5-46
VIII. DISASSEMBLY AND ASSEMBLY......5-60
A. Multifeeder Assembly ....................5-61
B. Front Paper Deck Assembly .........5-71
C. Right Deck Pick-Up Assembly
(cassette holder)............................5-80
D. Left Deck Pick-Up Assembly .........5-88
E. Pick-Up Vertical Path Roller
Assembly .......................................5-92
F. Registration Feeding Assembly.....5-93
G. Feeding Assembly .........................5-96
H. Holding Tray Assembly..................5-101
I. Holding Tray Feeding Assembly ...5-118