Lexmark W850dn, Manual

Page: 136 / 327

3-14
Finisher Service Manual
4024-110
Detecting punch waste full
Punch waste is stored in the punch waste box.
A sensor is provided to detect punch waste full.
When punch waste full is detected, it is notified to the operator only once.
Even if punch waste is not removed, the finisher can still punch media. However it can spread punch waste
inside the machine.
Detecting punch waste box
The sensor (punch waste box set) detects whether the punch waste box is properly set.
When the sensor (punch waste box set) does not detect that the punch waste box is properly set for four
seconds, the punch waste box count is reset.
Functions of punch sensors/motors
•
Sensor (punch unit side registration 1)
–
A reflective photo-sensor to detect the side edge of large media
–
Media side edge is detected by On/Off of this sensor while shifting the punch (containing this sensor)
in the direction of media width.
–
The sensor remains at “H” (+5 v dc) while media is present, and turns “L” when media side edge is
detected.
•
Sensor (punch unit side registration 2)
–
A reflective photo-sensor to detect the side edge of small media
–
This sensor has the same function as the sensor (punch unit side registration 1).
•
Sensor (punch carriage shift HP)
–
A photo-interrupter to detect the home position of the moving punch
–
It turns “H” (+5 v dc) (light blocking) when the home position is detected.
•
Sensor (punch unit HP)
–
A photo-interrupter to detect the home position of the cam plate that lowers the punching pins
–
It turns “H” (+5 V dc) when the home position is detected.
•
Sensor (punch hole select)
–
A photo-interrupter to detect the rear position of the cam plate
–
It turns “H” (+5 V dc) when the rear position is detected.
–
This sensor also detects the Cam position to switch punch holes (2-hole/3-hole).
•
Sensor (punch cam front)
–
A photo-interrupter to detect the front position of the cam plate
–
It turns “H” (+5 V dc) when the front position is detected.
–
This sensor is used to determine to which side (front or rear) the cam plate should be moved.
•
Sensor (punch unit motor encoder)
–
A photo-interrupter to detect pulse generated by the encoder attached to the punch unit motor
–
It counts punch unit motor revolutions, and becomes a trigger to stop the motor (by shutting off the
current).
•
Punch carriage shift motor assembly
A stepping motor to move the punch in the media width direction
•
Punch unit motor
–
A DC motor to move the cam plate that lowers the punching pins
–
Forward rotation of the motor moves the cam plate to the front side, and reverse rotation moves it to
the rear side.