Necta Colibri, Инструкция по установке, использованию и техническому обслуживанию, Страница: 16 / 48

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© by NECTA VENDING SOLUTIONS SpA 03-2003 217 00
Fig. 11
1 - Brewing chamber
2 - External disk
3 - Upper piston
4 - Lower piston
5 - Pre-brewing spring
6 - Swinging lever
COFFEE UNIT OPERATION
COFFEE DISPENSING CYCLE
After each time the machine is switched on, upon the first
espresso coffee based selection, the coffee unit is rotated
completely before the normal cycle, too ensure that the
device is in the correct start position.
When selecting coffee, the grinder is started and will
continue until the coffee doser chamber is full (see Figure
14).
When the doser unit is full, the ground coffee dose is
released into the coffee unit.
The coffee falls into the vertical brewing chamber (1) (see
Fig. 11).
The ratiomotor handle engaged with the disk (2) located
outside of the assembly rotates by 180°, making the brew
chamber swing and lowering the upper piston (3) (see
Figure 12).
Due to the water pressure, the pre-brewing spring (5) sinks
and the lower piston (4) goes down 4 mm, thus forming a
water cushion which allows an even use of the coffee dose.
At the end of the dispensing cycle and during a pause of 3
seconds, the pre-brewing spring (5) will discharge the
water through the third way of the dispensing solenoid
valve, lightly pressing the used coffee dose.
By completing its rotation, the ratiomotor makes the swing-
ing lever (6) lift the pistons and the coffee dose.
At the same time, when the brewing chamber returns to its
vertical position, the scraper on the coffee hopper stops the
used coffee dose and drops it.
The lower piston now returns to the bottom dead centre.