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CZ80 / CV860 Rev. .0
CHAPTER 5: SECOND PAPER FEED
MECHANISM
1. Second Paper Feed Mechanism
) With the activation of the Main motor during a printing job, the Main cam makes clockwise rotation
(looking from the rear of the machine).
2) The Main cam rotation moves the Sector gear back and forth via Cam follower arm. The
movement of the Sector gear rotates the Timing cam.
3) The Timing cam contains a one-way bearing. The one-way bearing allows the Timing roller to
rotate when the Timing cam makes counter-clockwise rotation, and the Timing roller stays still
when the Timing cam makes clockwise rotation.
4) Furthermore, the rotation of the Timing roller is designed to comes to a stop immediately after
the Timing cam finishes the counter-clockwise rotation. This is due to the Load spring applying
constant load (braking action) on the Timing roller.
5) The Guide roller, a free-rotating roller, rotates with the Timing roller when the Guide roller is in
contact with the Timing roller.
6) As the Timing cam rotates, the high portion of the Timing cam pushes the Guide roller up away
from the Timing roller.
7) While in printing, during the first paper feed action, the Guide roller comes down to make contact
with the Timing roller. Then the second paper feed action starts by the Timing roller and Guide
roller sending the paper into the machine. With the finish of the Timing roller rotation, the high
portion of the Timing cam raises the Guide roller away from the Timing roller to finish the second
paper feed.
2. Vertical Printing Position Mechanism
) With the push of the print position adjustment key, the Print positioning motor activates to rotate
the Print positioning cam. The rotation of the Print positioning cam moves the Print positioning
plate.
2) When the Print positioning plate moves from its default position, the Print positioning lever
changes the contact timing between the Main cam and Cam follower arm.
3) The change in the contact timing between the Main cam and Cam follower arm affects the Timing
roller rotation start timing. The second paper feed timing is changed and this results in the
change of the vertical print position.
4) In addition, the Vertical centering sensor determines the vertical print center position.
5) The vertical print center position is the position at the exact moment when the light path of the
Vertical centering sensor becomes unblocked
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