Mechanism; Press Mechanism - Riso RN SERIES Technical Manual

CHAPTER 6. PRESS SECTION

PRESS MECHANISM

Mechanism

1. Press Mechanism
The main motor activates when printing begins, and the Pressure solenoid [F] activates once the print
drum rotates through 40°.
As the clamp plate base on the print drum approaches the pressure roller, the protrusion on the Pressure
cam [A] pushes against Pressure lever A [B] to rotate it clockwise. This rotary motion causes Pressure
lever A [B] to push against Pressure lever B [C], and the Solenoid lever [G] separates from Pressure lever
B [C] and descends.
Once the protrusion on the Pressure cam [A] has passed, pressure lever A [B] rotates counter-clockwise.
Likewise, Pressure lever B [C] is pulled by the tension of the Pressure spring [D] and Second pressure
spring [E], and rotates in unison with Pressure lever A [B]. The Pressure shaft [H] fixed to Pressure lever
B [C] therefore also rotates counter-clockwise. The pressure roller therefore rises and is pressed against
the print drum.
During printing, the Pressure cam [A] pushes against Pressure lever A [B] and lowers the pressure roller
to prevent the pressure roller from touching the print drum clamp plate base. The Pressure solenoid [F]
remains activated.
After printing is complete, the Pressure solenoid [F] is deactivated when the print drum reaches the 135°
position.
E D
B
C
F
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RN (Version 1.0)
A
H
G