Paper Size Detection Mechanism - Riso ComColor X1 series Technical Manual

3. Paper Feed Pressure Change-Over Mechanism
The paper feed pressure lever can be moved left and right to switch between two levels of scraper paper feed
pressure (scraper pressure): Normal (weak) and Card (strong). Moving the paper feed pressure lever to the right
(card) increases the paper feed pressure (scraper pressure).

1-4. Paper Size Detection Mechanism

Paper size is detected by the following two methods.
1. Paper Transfer System: Paper length is detected by the timing of activation and deactivation of top edge
sensor 1.
2. System: Paper size is detected by the paper feed tray paper width potentiometer and paper length detection
sensor.
Paper feed tray
Paper length detection sensor
System side
Although the paper size is detected when paper is loaded in the paper feed tray or the other tray, if the paper length
detection sensor is triggered by incorrectly set feed tray paper guides or objects other than paper placed in the
paper feed tray, the system misinterprets this, treating it as if the paper is larger than the paper actually loaded.
Because printing at that wrong paper size occurs if paper is transferred after incorrect detection, the belt may
become soiled.
For this reason, the paper length is also detected in the paper transfer system. In the paper transfer system, paper
length is detected by the timing of activation and deactivation of top edge sensor 1. If different sizes are detected
in the system and the paper transfer section and the difference exceeds a particular range, the speed is controlled
based on the paper size detected in the paper transfer section.
Paper feed pressure lever
Paper guides
External paper
[ 4-9 ]
Top edge sensor 1
feed unit
Vertical
Top edge sensor 1
paper
Paper length calculated from the timing
feed unit
between activation and deactivation
Paper transfer side
External Paper Feed Section
ComColor Series (Revision 2.4)