Print Drum Angle Detection - Riso RZ3xx Series Technical Manual

2. Print Drum Angle Detection

Print drum angles are calculated from the main motor FG sensor count by using following parts.
- Main motor FG sensor.
- Position-B sensor on the main cover assembly.
- Position-B actuator plate attached on the pressure cam.
When the position-B actuator plate is detected by the position-B sensor, the print drum rotates for 4 degrees
and the machine stops. This is where the center of the actuator plate is in the sensor and we call it the
machine position-B. From this position the main motor FG sensor starts counting the pulse to determine the
print drum position. The main FG sensor count is 2933 pulses for one full rotation from position-B to the next
position-B. 326 pulse count is approximately 40 degrees turn from position-B, and this is where the print
drum angle is 0 (zero) degrees and is called position-A of the print drum and this is the position in which the
clamp plate is on the top and clamps the master during the master making operation.
Position-B actuator plate
Position-B sensor
Main cover assembly
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CHAPTER 3: MAIN DRIVE
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