Sharp Z-21, Руководство по обслуживанию

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2-2. Outline of paper feed operation
<<Z-26>>
1
When the COPY key is pressed, the motor starts rotating. At the
same time, the paper feed solenoid turns on to raise the stopper.
2
Paper is fed and the paper entry sensor (PID) is turned on.
3
The paper is stopped by the resist roller. After 2.3 sec from driving
the table position signal (TPSP) LOW, the resist roller solenoid
turns on to rotate the resist roller, transporting the paper to the
transfer section.
(Timing chart: Paper feed operation)
<<Z-21>>
1
When a paper is inserted into the paper feed port, the paper entry
sensor turns on.
2
The motor starts rotating to rotate the resist roller, transporting the
paper to the paper stopper position.
3
2.8sec after rising of the table position sensor (TPSP), the paper
stopper solenoid turns on to allow the paper to be transported to
the transfer section.
(Timing chart: Paper feed operation)
@
RRS-A and RRS-B are signal timings.
The paper stopper turns on at RRS-A timing.
3. Drive section
All drive operations in this model are performed by one motor. The
motor drive is transmitted through the drive unit to each section (the
paper feed section, the developing section, the drum unit, the docu-
ment table, the fusing section, and the fan unit).
4. Document table drive section
4-1. Outline
The document table is driven by a gear unit and the endless rack
which is integrated with the document table. A clutch is not used for
selecting feed and return.
The structures of the endless rack and the C bracket unit (gear unit)
are described in the following.
The endless rack is composed of the feed rack and the return rack as
shown in the figure above. The drive gears are utilized two ways: the
feed gear set and the return gear set. The bracket guide moves
along the groove in the rack cover. These parts provide feed and
return operations while keeping the same gear rotating direction.
1 Copy key
1 Motor
(M.M)
1 Paper feed
solenoid (PFS)
2 Paper entry
sensor (PID)
3 Resist roller
solenoid
Table position
sensor (TSPS)
About 2.3sec
1
2
1
1
2
3
1
2 Motor
(M.M)
3 Paper stopper A
(RRS-A)
3
Paper entry
sensor (PID)
Table position
sensor (TSPS)
About 2.8sec
Paper stopper B
(RRS-B)
500ms
1
2
2 3
Toner hopper
drive gear
Developing tank magnet roller drive gear
Document table drive gear
Motor gear
Upper heater
roller gear
Heater roller drive gear Drum and transport
section drive gear PS roller drive gear
C bracket unit Feed rack (Small pitch)
Return rack
(Large pitch)
Return gear
Feed gear
Bracket guide
Endless rack
Document cover Feed rack
Bracket guide
Return gear
Return rack
Feed gear
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