Paper Transfer Mechanism; Head Gap Adjustment Action - Riso ComColor X1 series Technical Manual

BP Section

1-3. Paper Transfer Mechanism

1. The BP unit keeps paper against the belt during transfer by means of suction fans (6).
2. The belt forms the shape of a trapezoid around the drive roller, driven roller, guide roller, and two tension rollers.
It is driven by rotation of the drive roller. (See Figure 1.)
3. Belt alignment is adjusted by changing the force applied by the front tension roller. Specifically, an adjustment
screw is turned to change the set position of the tension spring. (See Figure 2.)
4. The same tension mechanism is used on both ends of the tension roller. (See Figure 3.)
5. Tension adjustment is also possible from inside the unit.
6. The transfer belt motor maintains a specific drive roller speed via the timing belt. (See Figure 4.)
Paper
Driven
roller
Tension Roller
Paper feed side
Driven roller
Parts to
adjust
Front

1-4. Head Gap Adjustment Action

This action changes the distance between the surfaces of the belt and the head nozzles.
Several types of settings are available for the head gap. Adjust the head gap before using thicker stock such as
cards or envelopes to prevent contact between the paper and head.
1. To keep the head and the surface of the belt platen for paper transfer in the same position and parallel to each
other, the BP plate assembly touches the contact pins protruding from the head holder side. (See Figure 9.)
This action also keeps the driven and drive rollers parallel.
2. At this time, because the contact pins are arranged so that the wires pass through the center, the BP plate
assembly is sandwiched between the contact pins and wire hooks. (See Figure 10.)
3. Positioning in the direction of paper transfer is determined by the positioning pins protruding from the head
holder being inserted in the reference pin registration hole and the registration hole for position adjustment on
the belt platen side. (See Figure 11.)
4. Adjustment in the direction of paper transfer with the registration roller is done using the head holder pins,
which are inserted in the registration hole for position adjustment. Additionally, the adjustment piece in the
registration hole for position adjustment can be adjusted to move forward or back, and image adjustment (rough
adjustment) in the direction of paper transfer is possible.
Drive roller
Suction fan
Belt
Guide roller
Figure 1
Transfer belt
motor
Figure 3
Tension spring
Bearing
Figure 2
Transfer belt motor
Motor pulley
Figure 4
[ 7-4 ]
Adjusting screw
Tension roller
Drive roller pulley
Drive roller
ComColor Series (Revision 2.4)