Specifications

10-7. Lens Drive Mechanism/Control
(1) Lens Drive Mechanism
•
In this copier, registration for the original is to one side, while the copy
paper is fed through the center of the copier. For this reason, the Lens
must be moved according to the paper size even in the full size mode
(×1.000). The Lens is moved independently in the X-direction (feeding
direction) and Y-direction (crosswise direction).
(2) X (Feeding) Direction Lens Motion Mechanism/Control
The Lens is moved in the X-direction to obtain a conjugation distance
appropriate for the set zoom ratio.
•
The Lens is moved in the X-direction by the cable wound around the pulley
turned by Lens X Direction Drive Motor M12. (M12 is a stepping motor and
turned forward or backward by the pulse signal output from Scanner
Control Processor Board PWB-J.)
•
When a zoom ratio is selected, the Lens is moved as follows. The M12’s
shaft turns 7.5° per step, which is equivalent to approx. 0.19 mm of linear
Lens movement.
•
The Lens is at the full size position when the Lens X-Unit moves a distance
of approx. 95 mm from the position at which it has unblocked Lens X
Direction Reference Position Sensor PC2 (the sensor going from LOW to
HIGH). This position provides the reference for Lens movement in various
zoom ratios.
•
As the Lens moves in the X-direction, the 4th/5th Mirrors Carriage moves
to correct the conjugation distance appropriate for the zoom ratio.
Lens X-Unit
Blocked
Lens X Direction
Reference Position
Sensor PC2
4th/5th Mirrors
Carriage
Lens X Direction
Drive Motor M12
Lens Drive
Cable
Enlargement
Side
Full Size
Position
L
PC2
95 mm
1075M006AA
Full Size
Enlargement/Reduction
M-47