Hydraulics
A36163-B
149/182
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Jet speed calculation and adjustment
For high quality printing, the jet must be at a constant speed. The software continuously
measures the speed and adjusts it if necessary.
Jet speed calculation
Speed = Distance / Time
The principle used to measure the speed is as follows: A sequence of seven consecutive
drops is charged with a specific, precise amount of charge when it passes through the
charge electrode. The speed is measured in the detection electrode located immediately
below the charge electrode. The software measures the elapsed time between the point
when the detection electrode detects the specific electrical charge and the point when it
disappears from the detection electrode. As the distance traveled across the detection
electrode is known the software can calculate the jet speed.
The speed measured is then compared to the speed set point.
Automatic jet speed adjustment
Three cases can arise:
□
Speed measured > Speed set point
In this case the pressure in the accumulator must be reduced. The software controls the
opening and closing of solenoid valves AC3 and TA2 so as to reduce this pressure and
very quickly return the speed to the set point.
□
Speed measured < Speed set point
In this case the pressure in the accumulator must be increased. The software causes
ink to be taken from the buffer tank or the cartridge and added to the accumulator.
□
Speed measured = Speed set point
Nothing needs to be changed; the printer is ready to print.
Summary of Contents for 9020
Page 1: ...Book for serviceengineers internal use only ...
Page 2: ......
Page 3: ...A36163 B 3 182 Contents ...
Page 4: ...Contents A36163 B 4 182 Notes ...
Page 10: ...Contents A36163 B 10 182 ...
Page 11: ...A36163 B 11 182 Safety ...
Page 12: ...Safety A36163 B 12 182 Notes ...
Page 13: ...Safety A36163 B 13 182 Notes ...
Page 22: ...Safety A36163 B 22 182 Notes ...
Page 23: ...A36163 B 23 182 Printer Description ...
Page 24: ...Printer description A36163 B 24 182 Notes ...
Page 44: ...Printer description A36163 B 44 182 Notes ...
Page 45: ...A36163 B 45 182 Installation ...
Page 46: ...Installation A36163 B 46 182 Notes ...
Page 58: ...Installation A36163 B 58 182 Notes ...
Page 59: ...A36163 B 59 182 After sales service policy ...
Page 60: ...After sales service policy A36163 B 60 182 Notes ...
Page 74: ...After Sales Service Policy A36163 B 74 182 Notes ...
Page 75: ...A36163 B 75 182 Maintenance ...
Page 76: ...Maintenance A36163 B 76 182 Notes ...
Page 80: ...Maintenance A36163 B 80 182 Notes ...
Page 81: ...A36163 B 81 182 Troubleshooting ...
Page 82: ...Troubleshooting A36163 B 82 182 Notes ...
Page 134: ...Troubleshooting A36163 B 134 182 Notes ...
Page 135: ...A36163 B 135 182 Hydraulics ...
Page 136: ...Hydraulics A36163 B 136 182 Notes ...
Page 144: ...Hydraulics A36163 B 144 182 Notes ...
Page 153: ...Hydraulics A36163 B 153 182 Notes ...
Page 154: ...Hydraulics A36163 B 154 182 Notes ...
Page 155: ...A36163 B 155 182 Electronics ...
Page 156: ...Electronics A36163 B 156 182 Notes ...
Page 158: ...Electronics A36163 B 158 182 CPU Connections ...
Page 162: ...Electronics A36163 B 162 182 Notes ...
Page 163: ...A36163 B 163 182 General information ...
Page 164: ...General information A36163 B 164 182 Notes ...
Page 179: ...General information A36163 B 179 182 Notes ...
Page 180: ...General information A36163 B 180 182 Notes ...
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