HP FAX-750 Service Manual - Page 22

Paper feeding/ejecting mode Solenoid: ON, Motor rotation: Reverse

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[ 2 ] Paper feeding/ejecting mode (Solenoid: ON, Motor rotation: Reverse) In the paper feeding/ejecting mode, the control electronics activates the solenoid to release the stopper of arm A. When the motor rotates in the reverse direction, sun gear 24/90 ("B") rotates clockwise so that planet gear 34A ("J") transmits the torque via sun gear 65/60 ("K") and other gears to the paper feed roller gear ("T") and paper ejection roller gear ("R"). Since the stopper of arm B is blocked by section of the clutch lever, the planet gear 34B ("C") is merely idle without engaging with any other gear. The rotational torque of the paper ejection roller gear ("R") is transmitted to the inner gear of the clutch gear ASSY ("S"). However, the outer gear does not rotate since it is engaged with the platen gear ("Y") that undergoes the heavy frictional torque of the platen. (This clutch gear ASSY works as a one-way clutch. If the outer gear is driven by the platen gear ("Y"), the inner gear also rotates. Refer to [ 3 ] Recording mode.) Arm B Blocked by Section of Clutch Lever Active Gears III - 9

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III
- 9
[ 2 ]
Paper feeding/ejecting mode (Solenoid: ON, Motor rotation: Reverse)
In the paper feeding/ejecting mode, the control electronics activates the solenoid to release the
stopper of arm A.
When the motor rotates in the reverse direction, sun gear 24/90 ("B") rotates
clockwise so that planet gear 34A ("J") transmits the torque via sun gear 65/60 ("K") and other
gears to the paper feed roller gear ("T") and paper ejection roller gear ("R").
Since the stopper of arm B is blocked by section
of the clutch lever, the planet gear 34B ("C") is
merely idle without engaging with any other gear.
The rotational torque of the paper ejection roller gear ("R") is transmitted to the inner gear of the
clutch gear ASSY ("S").
However, the outer gear does not rotate since it is engaged with the platen
gear ("Y") that undergoes the heavy frictional torque of the platen.
(This clutch gear ASSY works as
a one-way clutch.
If the outer gear is driven by the platen gear ("Y"), the inner gear also rotates.
Refer to [ 3 ] Recording mode.)
Arm B Blocked by Section
of Clutch Lever
Active Gears