3S3
2-1-2
Figure 2-1-2 FRR System
The feed roller is driven counter-clockwise on the shaft in this system.
The retard roller has a torque limiter (one-way clutch) at one side to drive the roller freely from the shaft so that it rotates
counter-clockwise with the friction applied from the feed roller via paper.
Figure 2-1-3
If one sheet of more paper is fed coincidentally and pinched between the rollers, friction between paper is small and there
is no friction between the rollers. Then, the retartd roller stops at the work of the torque limiter. The feed roller continues
paper feed from the most upper paper source of the printer and the retard roller stops the second paper and prevents multi
feed.
Figure 2-1-4
Feed roller
Retard roller
One-way
clutch
Feed roller
Retard roller
Direction
at shaft
Direction
at shaft
Paper
Feed roller
Retard roller
Direction
at shaft
Direction
at shaft
Top paper
Second paper
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