Paper Lift; Tray Detection; Lift Mechanism - Ricoh B234 Service Manual

DETAILED DESCRIPTIONS

2.2 PAPER LIFT

2.2.1 TRAY DETECTION

When a tray is set in the machine, the tray detection method used depends on the
tray:
• The upper tray and middle tray are detected when any one of the paper size
switch signals is low.
• The lower tray is detected when the switch 1 signal of the paper size switch is
low.
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2.2.2 LIFT MECHANISM

When the machine detects that the paper tray is set in the machine, the tray lift
motor [A] rotates and the coupling gear [B] on the tray lift motor engages the pin [C]
of the lift drive shaft [D]. The tray drive belts [E] are connected to the tray bottom
plate [F] and are driven by the tray lift motor via the lift drive shaft [D] and tray drive
pulleys [G]. When the lift motor turns counterclockwise, the tray bottom plate [F]
moves up. The tray goes up until the top of the paper stack pushes up the pick-up
roller and the lift sensor in the feed unit is de-activated.
When the actuator [H] on the rear end of the bottom plate activates the paper
height sensors [I], the remaining paper capacity is detected. ( 2.4)
When pulling out the tray, the coupling gear [B] separates from the pin [C], so that
the tray bottom plate moves downward. In the bottom tray, the damper [J] lets the
tray bottom plate drop slowly.
B832
[E]
[J]
[H]
[I]
20
[F]
[D]
[G]
[E]
[C]
[B]
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SM
[A]