MX-5500N, MX-6200N, MX-7000N (serv.man17). MX-FNX3 4 MX-RBX2 MXPNX2A-D SERVICE MANUAL-Operational Description - Sharp Copying Equipment Peripheral (repair manual). Page 13

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MX-FNX4  OPERATIONAL DESCRIPTION  5 – 13
L. Controlling the movement of stacks (MX-FNX4)
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.
M. Folding a stack (MX-FNX4)
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 peripheral 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
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