Picture courtesy of Prof. Erhard Anthes / PH-Ludwigsburg  TRANSLATIONS:
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               Einstellring = Setting Disk
                     Kurbel = Crank
                      Kurve = Curve
                      Rolle = Roller
               Stellsegment = ADAPTING SEGMENT
             Traegerscheibe = Carrier Disk
                    Zahnrad = Gear
                 Ziffernrad = Figure Wheel

(1) Operator turns setting disk in the direction of the arrow.
    Disk stops in every rest position ( 0, 1, 2, ... or 9 ).
                                           =
(2) Operator turns crank in + or - direction.

(3) Crank turns the carrier disk and with it the ADAPTING SEGMENT.
    When the roller of the adapting segment hit the curve, the
    adapting segment will be pushed out to met the arithmetic gear.
    Dependent of the curve's position, the adapting segment is longer
    or shorter times connected with the gear and its figure wheel:
    This controls the transfer of the figures 0, 1, 2, ... or 9.