Pick-Up And Feeding - Canon LBP-1760 Service Manual

CHAPTER 2
B. Pick-up and Feeding
The envelope feeder picks up the envelope from the envelope feeder and feeds it to the printer.
The flow of the envelope is as shown below.
The envelope feeder is driven by the main motor (M101) of the printer via the gear.
When the /PRNT is sent to the engine controller from the video controller, the printer starts
the initial rotation. When the initial rotation is completed (completion of main motor start-up,
scanner motor start-up, high-voltage control sequence, and of fixing unit start-up), the envelope
feeder driver receives the pick-up command from the engine controller and turns ON the enve-
lope pick-up solenoid (SL901).
As a result, the pick-up roller, feed roller, and separation roller are rotated sequentially by the
main motor rotation, and an envelope is picked up.
removed by the separation roller and the picked up envelope is fed to the printer.
The envelope then reaches the registration arm where its skew is corrected, goes through
transfer, separation, fixing and delivery unit, and is delivered to the tray.
• Envelope feeder pick-up timing
/PRNT signal
Main motor (M1)
Scanner motor
Pick-up command
Pick-up solenoid (SL901)
Pick-up roller
Separation roller
Top of page sensor (PS103)
2 - 64
Figure 2-8-2
INTR
STBY
About 0.7
Figure 2-8-3
Then, the unnecessary envelopes are
(Unit: second)
PRINT
About 0.8