2 - L - 14
PAPER FEED UNIT
The 1st paper feed takes place as a result of the transmission
of drive force from M140 (paper feed) via MC5 (1st paper feed
(upper)), MC6 (1st paper feed (lower)) and MC7 (by-pass
paper feed) to the respective paper feed rollers. At this time,
the paper feed rollers are not touching the paper, hence the
swivel roller and the by-pass plate are moved up and down by
SD1 (1st paper feed (upper), SD2 (1st paper feed (lower)) and
SD3 (by-pass paper feed), causing each roller to touch the
paper. Control of each roller is done by the CB (control board).
The 2nd paper feed is done by MC3. Related signals are PS11
(conveyance door), PS14 (registration), PS18 (no feed), PS19
(optics sync), PS20 (pre-feed (upper)), PS21 (pre-feed (lower))
and PS30 (by-pass).
1. Operation
a. 1st paper feed operation timing
(1) 1st copy start
Timing that is determined by the P counter from when
the charging corona unit goes ON
(2) 2nd copy start
After the specified period from when PS14 (registra-
tion) goes ON for the 1st copy
(3) OFF timing
Specified count on the P counter
b. Intermediate conveyance control
The paper fed from the upper and lower trays is conveyed
to the 2nd paper feed section by the drive force of M140 via
MC8 (conveyance 1) and MC9 (conveyance 2). This
conveyance section is also used for feeding paper from the
ADU and LCT. However, it not used for by-pass paper
feed.
(1) MC8 ON timing
When PS20 or PS21 is ON
(2) MC8 OFF timing
After the specified period from when PS20 or PS21
goes OFF.
[4] Paper Feed Control
7-B11
11-B8
11-A11
7-B5
7-B6
6-A1
6-A2
6-A3
6-A4
6-A5
6-A6
6-A8
6-A7
6-B11
6-B10
SGND
PS11
5VDC
PS18
PS19
SGND
PS14
5VDC
SGND
PS30
5VDC
MC3 DRIVE
24VDC
SD5 DRIVE
24VDC
5VDC
M140 CONT
M140 PLL
SGND
M140 CLOCK
SD1 DRIVE
24VDC
SD2 DRIVE
SD3 DRIVE
MC5 DRIVE
MC6 DRIVE
MC7 DRIVE
MC8 DRIVE
MC9 DRIVE
120-A1
120-A2
120-A3
120-A4
120-A5
7-A6
7-A5
7-A7
7-A8
7-A9
7-A10
7-A12
7-B12
144-4
CB
SD1
SD2
SD3
MC5
MC6
MC3
MC7
MC8
MC9
DCPS
40VDC
PGND
88-5
88-3
SD5
PS11
52-1
52-2
52-3
13-1
13-2
13-3
141-1
141-2
141-3
46-1
46-2
46-3
32-1
32-2
32-3
PS18
PS19
PS14
PS30
M140
PAPER FEED UNIT-1
To Next Page
Loading...