II-25
2.2
Paper Transfer
2.2.1
Paper Supply
The pick-up roller picks up one sheet of paper from the paper tray at every one
rotation and feeds it to the paper feed roller one by one.
Fig. 2.27
The paper is gripped between the pick-up roller and the separation pad and
separated into individual sheets.
The pick-up roller is directly connected to the sector gear, whose rotation is forcibly
stopped by the gear stopper; when the pick-up solenoid is activated, the clutch
mechanism is engaged by the solenoid ON/OFF and the sector gear is driven;
when it has completed one full turn its rotation is stopped again by the gear
stopper. The paper drawn out by the pick-up roller presses against the top of form
sensor lever and the paper top position/absence of paper is detected by sensing
the motion of the lever.
2.2.2
Paper Registration
When paper picked up from the multi-purpose paper tray (MPT) presses against
the top of form sensor actuator, the registration sensor lever is caused to turn, and
the photo sensor detects this motion. With this signal from the sensor the paper
feed roller is stopped of its rotation temporarily by the clutch. Then paper is fed to
the nip point between the paper feed roller and the pinch roller in the multi purpose
paper tray, and the skew of the paper is corrected by the bump of the leading edge
of paper against the nip point. When the paper feed roller starts to rotated again
by the motion of clutch, paper, leading edge of which has been aligned, is fed by
the paper feed roller and is transported to the transfer roller.
Clutch mechanism (engaged/released by the solenoid assembly)
Released when the solenoid is ON and engaged when the solenoid is OFF.
Fig. 2.28
Pick-up roller
Registration sensor lever
Hopper plate
Separation pad
Papers
Pinch roller
Paper feed roller
Drum
Transfer roller
Idle gear
Paper feed gear
Paper feed roller
Paper
Summary of Contents for HL-720
Page 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Page 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Page 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Page 61: ... Fig 3 18 2 4 1 1 1 ...
Page 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Page 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Page 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Page 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Page 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Page 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Page 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...