Riso ComColor X1 series Technical Manual page 219

Structure of Circulation Pump
< Piston Pump >
One-way Valve
Ink flows only in the
direction indicated.
Flow in the opposite
direction is stopped.
Made of soft rubber.
The one-way valve
(rubber) is made of
very soft material
that when the ink
from the Pressurized
ink tank is drained
through the Heat
Sink drain tube, the
ink in the Print head
area, also by its
own weight drains
out from the one-
way valve of this
Piston pump via the
Negative pressure
pump.
Electromagnetic Coil
The piston is moved by magnetic force of the coil.
Same as a solenoid.
When the coil is activated, the piston slides back and the ink chamber expands,
taking in the ink from the Negative pressure ink tank.
After this, deactivating the coil causes the piston to push out under the force
of the spring. The ink chamber contracts, pushing the ink up towards the
Pressurized ink tank, creating a pressure in the ink flow system. Note that when
the piston movement stops, no pressure in the ink-flow system is generated.
From the negative pressure ink tank
Coil OFF
Piston
Coil ON
Spring
[ 11A-7 ]
Ink Flow Section
to the heat sink
(Heat exchanger tower)
Ink chamber
ComColor Series (Revision 2.4)
View with the cover removed