Chapter 3 Functional descriptions
SMSO-2-02.03- 15.07.03 71
Brewing system (coffee), continued ......... 01.04.2002
......... Serial no. 505123
Process
step
Control system (electronic/electrical) Hydraulic system Mechanical processes
Heating the instant heater
10 The instant heater heating is switched on
and off according to the programmed
control conditions (transistor switches
power relay 11)
The water in the instant heater is heated.
Repress
11 Switch on piston motor to repress the
coffee grounds. The piston motor stays on
for approximately 0.2 seconds.
The brewing cylinder travels upwards a little
higher and presses the coffee grounds
The remaining water in the coffee grounds
flows through the brewing pipe and the open
flush valve into the drip tray.
Ejection of coffee grounds, brewing unit moves back to start position
12 End re-press process, reverse the direc-
tion of the piston motor to open the brew-
ing cylinder.
13 The brewing cylinder now moves down-
wards; the lower piston slides on the friction
piston 2000 and pushes the coffee grounds
out of the brewing cylinder. The stripper
ejects the coffee grounds into the drawer for
coffee grounds.
When the piston cannot go down any
further, its direction of rotation is reversed
via the piston motor current measurement
device.
The brewing cylinder moves back up, and
the friction piston 2000 retains the lower
piston until it is pulled out of the friction
piston 2000 through the brewing cylinder.
Start position of brewing unit
14 The microswitch on the machine sends a
“piston start position reached” signal; the
piston motor switches off
The brewing unit is in the start position.
Additional water
To made a weak coffee (for example so that a spirit can be added) there is a bypass system that is used for a programmed
period, while the product is discharged (step 8) to mix hot water from the instant heater through the bypass valve into the coffee
outlet pipe.
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