4.3 LENS DRIVE
– Vertical (Parallel to the Paper Feed Direction) –
The lens vertical drive motor [A] changes the vertical position [B] of the lens
in accordance with the selected reproduction ratio (50 ~ 200%). The motor,
which is a stepper motor, drives the lens through the lens drive wire [C].
The lens vertical home position sensor [D] detects the vertical position of the
lens for full size mode. The vertical position of the lens for the selected
reproduction ratio is determined by the number of pulses from the full size
position.
– Horizontal (Perpendicular to the Paper Feed Direction) –
The original’s horizontal position on the exposure glass varies depending on
the mode (platen or ADF). This prevents problems such as skewing that are
caused when the original moves too close to the rear scale in automatic feed
mode. However, the center is the standard position for copy paper feed.
Therefore, the horizontal position [E] of the lens has to be changed in
accordance with paper size, reproduction ratio, and original feed mode.
The lens horizontal drive motor [F] drives the lens through the lens drive wire
[G]. The lens horizontal home position sensor [H] detects the horizontal
position of the lens. The home position of the lens is the horizontal position
for A4/LT sideways in full size and platen mode; the positions for other
conditions are determined by counting the number of motor drive pulses
from the home position.
Since this model has a horizontal lens drive mechanism, side-to-side
registration adjustment for each feed station can be done easily using SP
mode (SP4-011).
[G]
[D]
[H]
[F]
[C]
[A]
[E]
[B]
A156/A160/A162 2-42 STM
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