Wittenborg FB 7100 - Function of the Brewer

Service Manual FB 7100 Brewer System
5B - 30 January, 2005
B.4 Function of the brewer
Introduction Through an electronically controlled brewing process the brewer takes in
coffee and water and dispenses freshly brewed coffee.
The principle of the brewing process is that a plunger moves down inside
a cylinder pressing the freshly brewed coffee through a filter plate.
Brewing process The brewing process can be divided into the following phases:
• Brewer preparing a brewing chamber
• Dosing of ingredients
• Extraction time
• Dispensing of drink
• Brewer returning to start position
Table brewing
process
This table shows the various phases of the brewing process and the stages
in each phase”:
Phases
• Brewer preparing a brewing chamber
Continued...
Stage Description of function Illustration
1 Control switches actuator motor
on to drive actuator/spindle.
2 Actuator spring winds up
Spindle:
• opens the switch BAE
(Brewer at end), and
• presses down the plunger.
3 Scraper moves forward (if set to
starting position at rear)
Filter Plate closes the brewer
cylinder.
Note: Counterpressure of
brewer cylinder prevents the filter
plate and the actuator from
further ascending
4 Control stops the actuator motor
when the pin on the plunger
holder does not operate the
microswitch BC (Brewer closed)
any longer (illustration).