Riso RZ5 Series, Technical Manual, Page: 60 / 410

RISO Inc. Technical Services & Support US.RISO.COM
CHAPTER 5: SECOND PAPER FEED SECTION
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Sector gear cam
Timing Cam
Sector gear spring
Sector gear assembly
Load spring
Guide roller pressure spring
Mechanism
1. Second Paper Feed Mechanism
During the printing, the sector gear cam and timing cam rotate in counterclockwise direction.
The pull of the sector gear spring pushes cam follower on the sector gear assembly against the sector gear
cam. Riding on the sector gear cam, the sector gear assembly makes pendulum (swinging) action when the
sector gear cam rotates. The sector gear transfers the drive to the timing gear. The timing gear has a built-in
clutch to drive the timing roller only when the gear rotates in the counterclockwise direction by the clockwise
swing of the sector gear. Due to the one-way clutch on the timing gear, the timing roller stays stationary when
the sector gear swings in the counterclockwise direction to rotate the timing gear in the clockwise direction.
To ensure that the timing roller stops instantly when the timing gear ends its counterclockwise rotation, a load
spring is mounted on the operators side of the timing roller to apply a brake on the timing roller.
The guide roller receives is rotation drive directly from the timing roller. The guide roller pressure spring pulls
the guide roller down against the timing roller to make the contact. When in contact, the guide roller makes
its rotation only when the timing roller rotates. When the timing cam pushes the G-lever down, the guide roller
rises and releases the contact with the timing roller.
During the printing, as the first paper feed area sends the paper onto the second paper feed area, the guide
roller is in contact with the timing roller and stationary. As the paper arrives, both the timing roller and guide
roller rotate to pinch the paper in between and transfers the paper onto the print drum area for printng.
During the printing, as the rotation of the timing roller ends, the guide roller elevates up to disengage from the
timing roller to let the paper go through into the printing area freely without any drag.
Guide roller
Timing roller
Timing gear
0501
G-lever assembly