164 Theory of operation ENWW
ITB self-aligning mechanism
This printer automatically aligns the position of the ITB to prevent tearing of the belt due to its
misalignment.
The alignment rollers, alignment gear, and alignment arm inside the ITB unit move the ITB feed
roller back and forth to align the belt (see the figure below) as described by the following steps.
1 The ITB has a rib on the back along the left edge of the belt. Inside the ITB unit, two alignment
rollers are positioned at both sides of the rib so that the rib (ITB) will rotate the roller if it is in
contact with one of the rollers. If the ITB is drawn leftward or rightward during rotation, the rib
will touch one of the alignment rollers and turns the roller. (If the ITB is drawn rightward, the
right roller turns, and if it is drawn leftward, the left roller turns.)
2 The rotation of the alignment roller turns the alignment gear.
3 The rotation of the alignment gear moves the alignment arm.
4 Being interlocked with the arm, the ITB feed roller moves frontward or backward as the
alignment arm moves.
5 The force to feed ITB on each side varies as the ITB feed roller moves back and forth. This
brings the ITB back to the original position before it has been drawn left or right and the
misalignment of the ITB is corrected.
This mechanism functions whenever the ITB rotates to prevent misalignment of the ITB.
Figure 5-48 ITB self-aligning mechanism
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