Sharp MX-FN19 / MX-FN20 / MX-PN12 Service Manual / Specification ▷ View online
MX-FN19 OPERATIONAL DESCRIPTION 6 – 12
J. Controlling the phase of the crescent roller
If alignment was executed with the crescent roller in contact with
the stack of sheets, the resulting friction against the roller causes
the stack to move inappropriately. To prevent this problem, the
phase of the roller is identified and used to determine the timing of
alignment.
The phase of the crescent roller is identified by the crescent roller
phase sensor (FSCRPD). The flag for the crescent roller phase
sensor is mounted to the crescent roller shaft. The flag will leave
the sensor while the roller shaft rotates, turning the sensor ON or
OFF, enabling the assumption that the crescent roller is positioned
at the opposite side of the stack. The alignment plates are operated
to correspond with this change in the state of the sensor.
the stack of sheets, the resulting friction against the roller causes
the stack to move inappropriately. To prevent this problem, the
phase of the roller is identified and used to determine the timing of
alignment.
The phase of the crescent roller is identified by the crescent roller
phase sensor (FSCRPD). The flag for the crescent roller phase
sensor is mounted to the crescent roller shaft. The flag will leave
the sensor while the roller shaft rotates, turning the sensor ON or
OFF, enabling the assumption that the crescent roller is positioned
at the opposite side of the stack. The alignment plates are operated
to correspond with this change in the state of the sensor.
K. Outline of folding
The paper folding mechanism consists of a guide plate, paper fold-
ing rollers, paper pushing plate, and paper positioning plate.
The guide plate is used to cover the folding rollers while sheets are
output so as to prevent sheets from coming into contact with the
folding rollers during output. Before the stack is folded, the guide
plate moves down to enable the folding rollers to operate.
Designations and functions of the motors and sensors to be used in
the folding mechanism are shown below.
ing rollers, paper pushing plate, and paper positioning plate.
The guide plate is used to cover the folding rollers while sheets are
output so as to prevent sheets from coming into contact with the
folding rollers during output. Before the stack is folded, the guide
plate moves down to enable the folding rollers to operate.
Designations and functions of the motors and sensors to be used in
the folding mechanism are shown below.
Crescent roller
phase sensor (FSCRPD)
Flag
Feed motor
Alignment plate
Crescent roller
Stack
FSFM
Alignment plate
Sensor
flag
Crescent
roller
Crescent roller
phase sensor
(FSCRPD)
If the crescent roller
was in contact with the
stack, alignment operation
could be obstructed.
Motor
Function
Folding motor (FSFOM)
Drives paper folding roller
Paper pushing plate motor
(FSLGM)
(FSLGM)
Drives paper pushing plate
Sensor
Function
Paper pushing plate motor clock
sensor (FSLGE)
sensor (FSLGE)
Detects clock pulses from the paper
pushing plate motor
pushing plate motor
Paper folding motor clock sensor
(FSFOE)
(FSFOE)
Detects clock pulses from the paper
folding motor
folding motor
Tray paper sensor (FSTPD)
Detects presence/absence of paper
on delivery tray of saddle stitch unit
on delivery tray of saddle stitch unit
Delivery sensor (FSPDD)
Detects delivery of paper
Paper pushing plate home
position sensor (FSLGHPD)
position sensor (FSLGHPD)
Detects home position of paper
pushing plate
pushing plate
Paper pushing plate top position
sensor (FSLGTD)
sensor (FSLGTD)
Detects top position of paper pushing
plate
plate
Vertical path paper sensor
(FSVPPD)
(FSVPPD)
Detects remaining paper after
correction of jam
correction of jam
Paper folding home position
sensor (FSFOHPD)
sensor (FSFOHPD)
Detects home position of paper
folding roller
folding roller
Alignment operation is
started when the flag has
covered the sensor and the
crescent roller is away from
the stack.
Crescent roller phase
sensor (FSCRPD)
Alignment operation
Feed motor (FSFM)
First sheet
Second sheet
Feed motor
stop
MX-FN19 OPERATIONAL DESCRIPTION 6 – 13
L. Controlling the movement of stacks
When a stack has been stitched (2 points), the paper positioning
plate lowers so that the stack center (stapling position) will move to
where the paper folding rollers come into contact with the stack and
where the paper pushing plate is located. The position of the paper
positioning plate is controlled in reference to the number of motor
pulses coming from the paper positioning home position sensor
(FSPPHPD).
At the same time as the paper positioning plate operates, the guide
plate lowers so that folding may take place.
plate lowers so that the stack center (stapling position) will move to
where the paper folding rollers come into contact with the stack and
where the paper pushing plate is located. The position of the paper
positioning plate is controlled in reference to the number of motor
pulses coming from the paper positioning home position sensor
(FSPPHPD).
At the same time as the paper positioning plate operates, the guide
plate lowers so that folding may take place.
M. Folding a stack
A stack is folded by the action of the paper folding rollers and the
paper pushing plate.
The paper pushing plate pushes against the center of a stack
toward the folding roller contact section.
The paper pushing plate starts at its home position and waits at the
leading edge position until the stack has been drawn to the paper
folding roller and is gripped for a length of 10 mm. When the paper
folding roller has gripped the stack for a length of about 10 mm, the
paper pushing plate motor starts to rotate reverse, and the paper
pushing plate returns to its home position. The stack gripped in this
way by the paper folding roller is drawn further by the paper folding
roller and then is moved by the delivery roller to the paper tray.
Half of the peripheral area of the paper folding rollers excluding the
center part is punched out.
This punched out area only feeds the paper as the paper feeding
roller (lower) contacts the paper feeding roller (upper) only at the
center of the roller to prevent the paper from wrinkling. As the
paper feeding roller (lower) contacts the paper feeding roller
(upper) at their entire surfaces on the remaining half of the periph-
eral area, paper folding starts from this half of the peripheral area,
and paper is fed while it is being folded. The stop position of the
paper folding rollers is in this half of the peripheral area.
The punched out area only feeds the paper as the paper feeding
roller (lower) contacts the paper feeding roller (upper) only at the
center of the roller to prevent the paper from wrinkling.
The paper folding start and stop positions on the paper folding roll-
ers is controlled according to the motor clock signals from the
paper folding home position sensor (FSFOHPD).
paper pushing plate.
The paper pushing plate pushes against the center of a stack
toward the folding roller contact section.
The paper pushing plate starts at its home position and waits at the
leading edge position until the stack has been drawn to the paper
folding roller and is gripped for a length of 10 mm. When the paper
folding roller has gripped the stack for a length of about 10 mm, the
paper pushing plate motor starts to rotate reverse, and the paper
pushing plate returns to its home position. The stack gripped in this
way by the paper folding roller is drawn further by the paper folding
roller and then is moved by the delivery roller to the paper tray.
Half of the peripheral area of the paper folding rollers excluding the
center part is punched out.
This punched out area only feeds the paper as the paper feeding
roller (lower) contacts the paper feeding roller (upper) only at the
center of the roller to prevent the paper from wrinkling. As the
paper feeding roller (lower) contacts the paper feeding roller
(upper) at their entire surfaces on the remaining half of the periph-
eral area, paper folding starts from this half of the peripheral area,
and paper is fed while it is being folded. The stop position of the
paper folding rollers is in this half of the peripheral area.
The punched out area only feeds the paper as the paper feeding
roller (lower) contacts the paper feeding roller (upper) only at the
center of the roller to prevent the paper from wrinkling.
The paper folding start and stop positions on the paper folding roll-
ers is controlled according to the motor clock signals from the
paper folding home position sensor (FSFOHPD).
Folding roller
Paper pushing plate
Paper positioning plate
Guide plate
Paper positioning
plate home position
sensor
FSPPHPD
Stitch end
Paper positioning plate motor
(FPPM)
Guide motor (FSGM)
Guide home position sensor
(FSGHPD)
Equivalent of specific
number of pulses
Paper pushing plate top
position sensor (FSLGTD)
Sensor flag
Paper folding roller (upper)
Paperfoldinghomeposition
sensor(FSFOHPD)
Punchedoutportion
Stackofsheets
Paper pushing plate home position
sensor (FSLGHPD)
Paperpushingplate
Paperpushing
platemotor
Paperfoldingmotor
Paperfoldingroller(lower)
FS
FOM
FS
LGM
Paper pushing plate top position sensor (FSLGTD)
Sensor flag
Paper folding home position
sensor (FSFOHPD)
Paper pushing plate home position
sensor (FSLGHPD)
Paperpushingplate
Paperpushing
platemotor
Paperfoldingmotor
FS
FOM
FS
LGM
MX-FN19 OPERATIONAL DESCRIPTION 6 – 14
[Paper folding start position]
[Paper folding roller stop position]
N. Double folding a stack
To fold a stack consisting of 10 or more A4-R or LTR-R sheets,
folding is executed twice for the same sheet.
The paper folding rollers rotate in reverse for an equivalent of 20
mm after gripping the stack for a length of 20 mm, enabling the
paper folding rollers to apply an increased degree of pressure
along the crease on the stack. Then, the paper folding rollers rotate
normally, and the paper pushing plate returns to its home position
while the stack is being delivered.
This way, a stack requiring a large force may properly be folded
with less pressure.
1)
folding is executed twice for the same sheet.
The paper folding rollers rotate in reverse for an equivalent of 20
mm after gripping the stack for a length of 20 mm, enabling the
paper folding rollers to apply an increased degree of pressure
along the crease on the stack. Then, the paper folding rollers rotate
normally, and the paper pushing plate returns to its home position
while the stack is being delivered.
This way, a stack requiring a large force may properly be folded
with less pressure.
1)
The paper pushing plate pushes the stack in the direction of
the paper folding rollers.
the paper folding rollers.
2)
The paper folding rollers grip the stack for a length of about 20
mm.
mm.
3)
The paper folding rollers rotate in reverse, pushing back the
stack for a length of about 20 mm (reverse feeding).
stack for a length of about 20 mm (reverse feeding).
Deliveryoutlet
Stackofsheets
Paperpushingplate
Paperfeedinlet
Sensorflag
Paper folding home
position sensor (FSFOHPD)
Paperisfolded/fed.
Paperisfed.
Deliveryoutlet
Paperfeedinlet
Paper folding home
position sensor (FSFOHPD)
Sensorflag
Paperisfolded/fed.
Paperisfed.
Paperisfed.
Paper folding motor (FSFOM)
Paper pushing plate
motor (FSLGM)
Paper pushing plate home
position sensor (FSLGHPD)
Paper pushing plate top
position sensor (FSLGTD)
Delivery sensor (FSPDD)
Tray paper sensor (FSTPD)
Paper folding home position
sensor (FSFOHPD)
Equivalent of 10mm by paper folding motor
: Motor CW
: Motor CCW
Paper folding motor
Paper folding roller
Paper pushing
roller
Paper pushing plate
motor
FS
FOM
FS
LGM
20mm
(approx.)
Paper folding motor
FS
FOM
20mm
(approx.)
Paper folding motor
FS
FOM
MX-FN19 OPERATIONAL DESCRIPTION 6 – 15
4) The paper folding rollers rotate again, feeding out the stack.
The paper pushing plate returns to its home position.
3. Intermediate stapling tray
A. Job offset
In the job offset mode, paper is shifted to the front or back by the
stack for delivery, and the stacks are sorted.
The paper delivered to the stapling tray is moved forward or back-
ward by the front alignment plate and the back alignment plate. The
aligned paper is stapled or discharged in accordance with the sig-
nals from the host machine. The finisher controller PCB drives the
alignment plate front motor (FFJM) and the alignment plate back
motor (FRJM) at power-on to return the two alignment plates to
their home positions.
Designations and functions of the motors and sensors to be used in
the stack job offset mode are shown below.
stack for delivery, and the stacks are sorted.
The paper delivered to the stapling tray is moved forward or back-
ward by the front alignment plate and the back alignment plate. The
aligned paper is stapled or discharged in accordance with the sig-
nals from the host machine. The finisher controller PCB drives the
alignment plate front motor (FFJM) and the alignment plate back
motor (FRJM) at power-on to return the two alignment plates to
their home positions.
Designations and functions of the motors and sensors to be used in
the stack job offset mode are shown below.
B. Stacking paper on stapling tray
After the trailing edge of paper passes through the first delivery
roller, the paper is delivered to the stapling tray by the delivery
roller and the return roller until it buts against the stapling tray stop-
per.
roller, the paper is delivered to the stapling tray by the delivery
roller and the return roller until it buts against the stapling tray stop-
per.
C. Offset operation
The front alignment plate or the back alignment plate shifts the
sheet delivered to the front or back. The offset operation is carried
out whenever paper is drawn into the stapling tray.
sheet delivered to the front or back. The offset operation is carried
out whenever paper is drawn into the stapling tray.
Paper folding motor
Paper pushing
plate motor
FS
FOM
FS
LGM
Equivalent of 20 mm
Gripping of paper stack
Equivalent of 20 mm
(reverse feeding)
Paper folding motor (FSFOM)
Paper pushing plate motor (FSLGM)
Paper pushing plate home position sensor (FSLGHPD)
Paper pushing plate home position sensor (FSLGHPD)
Paper pushing plate top position sensor (FSLGTD)
Delivery sensor (FSPDD)
Delivery sensor (FSPDD)
Tray paper sensor (FSTPD)
Paper folding home position sensor (FSFOHPD)
:Motor CW
:Motor CCW
Alignment front home
position sensor (FFJHPD)
Front alignment
plate
Alignment back home
position sensor (FRJHPD)
Shielding plate
Back alignment
plate
Paper
Alignment plate back motor
(FRJM)
Alignment plate front motor (FFJM)
(Front)
Shielding plate
Results of Delivering 4sets job offset
4th set
2nd set
3rd set
1st set
Delivery direction
Motor
Function
Alignment plate front motor
(FFJM)
(FFJM)
Aligns paper in stapling tray at front
Alignment plate back motor
(FRJM)
(FRJM)
Aligns paper in stapling tray at back
Swing motor (FSWM)
Raises or lowers swing guide
Trailing edge assist motor
(FASM)
(FASM)
Delivers trailing edge of paper stack
Sensor
Function
Swing guide home position
sensor (FSWHPD)
sensor (FSWHPD)
Detects home position of swing guide
Alignment plate front home
position sensor (FFJHPD)
position sensor (FFJHPD)
Detects home position of alignment front
plate
plate
Alignment plate back home
position sensor (FRJHPD)
position sensor (FRJHPD)
Detects home position of alignment back
plate
plate
Trailing edge assist home
position sensor (FASHPD)
position sensor (FASHPD)
Detects home position of trailing edge
assist
assist
Stack delivery
roller
No.1 delivery roller
Return roller
Stapling tray stopper
Back alignment plate
Offset sheet
Front alignment plate
Tray
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