Raising And Lowering Of The Belt Platen - Riso ComColor X1 series Technical Manual

1-2. Raising and Lowering of the Belt Platen

The BP unit is raised or lowered to move into the printing or idle position.
1. The BP unit is raised or lowered by means of four wires suspended from the head holder. (See Figure 5.)
2. The wires are held by wire hooks incorporated in the BP unit, which hold the wires with anchors (balls). (See
Figure 6.)
3. There are five stopping positions: a position for standard paper, for heavyweight paper, for envelopes 1 and 2,
and for clearing paper jams (when the maintenance unit is moved). Two sensors detect the stopping position of
the belt platen, one each at the upper limit and one at the lower limit. (See Figure 7.)
4. For the paper position, stopping after raising or lowering is controlled by a pulse when the upper limit sensor is
activated. For the position to clear paper jams, movement stops when the lower limit sensor is activated. Note
that the BP unit moves along the elevation guide in back. (See Figure 8.)
5. Regarding the lower limit position, because the maintenance unit moves on top of the BP unit, this position is
kept constant. However, regarding the maintenance position, because the head holder is positioned relative
to the maintenance unit, the BP unit can be moved forward or back. Additionally, regarding the upper limit
position, because the BP unit can be positioned by means of registration with pins protruding from the head
holder (which provide reference points), it can be moved forward or back as well as the direction of paper
supply and ejection.
6. During printing, a specific clearance (head gap) is maintained between the top surface of the belt and the
surface of the head nozzles. In the event of paper transfer problems, the belt platen is lowered, enabling the
paper to be removed.
7. For head maintenance as well, the BP unit can be raised.
8. During paper jams, the maintenance unit does not go under the head.
Wires (4 pieces)
Wire hooks
(4 positions)
Figure 5
BP upper limit sensor
BP lower limit sensor
Figure 7
Wire
Wire anchor (ball)
BP unit
[ 7-3 ]
BP Section
Wire hook
Figure 6
Elevation guide
Figure 8
ComColor Series (Revision 2.4)