Paper Position Detection Unit Mechanism - Riso ComColor X1 series Technical Manual

Registration Section

1-6. Paper Position Detection Unit Mechanism

This unit is between the registration rollers and the head that is closest to the registration area. The unit is
comprised of a section for paper lift/crease detection (including paper retainer), a section for paper width detection,
and supporting sections.
1. Detection of Paper Lift
• If paper lift exceeds a specific amount, the lift is detected, transfer stops, and operation to clear jamming is
executed (by moving the belt platen to the lower limit).
• Detection of paper lift
Paper lifted higher than a specific amount comes into contact with the detection gate and vibrates. This
movement is detected by a sensor and interpreted as lift exceeding the prescribed amount. All types of lift
can be detected, including lift at the corners or rippling.
2. Paper Width Detection
• Image centering
The width of the entire sheet of paper is detected, and images are centered relative to the sheet position.
• Masking
The paper is constantly detected, and portions of images that exceed the width are masked.
Gate gap
Adjustment arm
Paper position detection unit
Transfer belt rollers
CIS
Paper Position Detection Unit (Side View)
Paper lift detection sensor
(detection gate)
Top edge sensor 2
Suction fan (6 pcs)
Transfer belt
Schematic Diagram of Paper Lift Detection
Top edge sensor 2
(reflective)
Detection gate
Paper lift detection sensor
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ComColor Series (Revision 2.4)