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KUNDO  WORLD  TIME  CLOCK


            It is now   =   10:34   in  SanFrancisco
                        =   19:34   in  Berlin

W O R L D   T I M E   C L O C K        » K U N D O «        (1960)
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( 23 cm Diameter )     Kieninger & Obergfell, St.Georgen / Germany

The world map is shown in "North Polar Projection".  GMT is on the
bottom.  This "tic-tac" clock  has a  "balanced spring"  mechanic.
A battery powered motor  winds up the main spring  every 4 minutes
due to a MECHANICAL(!) TIMER. A 12 HOUR FACE shows the LOCAL TIME.
The outer ring with 24 HOURS  shows  the TIME-ZONES & WORLD CITIES
with DAY & NIGHT.

R E M A R K S :
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(A) HOW THE  ELECTRO-MECHANICAL  K U N D O  WORLD CLOCK  WORKS:
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View without plastic cover / battery holder ...

       

The red/black marks on the right side indicates where the contacts
of the battery are connected when the cover is mounted. From there
cables  with clips  go direct  to the motor.  The On/Off-Switch is
inside (!) the motor. On the Motor-Axle is a HELIX-Gear mounted.
This HELIX drives the Plastic-Wheel-Gear. On its Axle below ( see
pic.2 ) is the SPRING  and a Brass-Wheel-Gear,  what drives the
clock-work. Inside the Plastic-Wheel-Gear is a "Nose-Pair" partly
movable. This assembly, together with the L-Shape-LEVER (who shift
the Motor-Axle left/right = Motor Off/On ), is a MECHANICAL-TIMER.

The activated Motor turns the Plastic-Wheel and wind-up the spring;
then Motor stops (see pic.1 ).  Spring-driven the clock is running
~4 Min. and the MECHANICAL-TIMER activates the Motor again ...

(B) REPAIR / RESTORATION:      
-------------------------
(1)
Nothing worked - also not after oiling and cleaning contacts ...
(2)
To open  the motor  a little  force  was necessary - and  2 hidden
pins,  holding the  axle/contact plate,  cracked its plastic.  Now
the V-shaped  inner contacts  where visible and  obvious unable to
touch the collector of the motor.  Shaped it right with trial-and-
error:  They have  to give contact  when the axle is  in its right
position, and out of contact  otherwise.  2 CLIPS, made out of CAT
FOOD CAN ( fixed with tape ), holding in place the plastic plate
on the cast metal motor housing.
(3)
The  helix-gear  was loose  and  needed a new  connection:  On the 
motor axle  is a one-turn spring  mounted  and through the slot of
the helix-gear fixed. The exact position of the helix-gear on the
axle is part of the fine-tuning procedure ...
(4)
The Tuning-Procedure had to be made with an AmpMeter "In-the-Loop"
to make sure, that the Motor-On/Off is working perfect. To make the
»KUNDO« working again is difficult (+ time-consuming) because many
parameters have to be adjust "right" at the same time ...

       

                                      powered by a 1.5 Volt D-Cell

  Okt./Nov.'21 Total-Ueberholung noetig, da »KUNDO« "tod" ...
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PARAMETER EINSTELLUNGEN entscheidend zum zuverlaessigen Arbeiten:

  o  Motor-Kontakt-SCHEIBE ...
     = Offene INNEN-Seite:  Form und Position der Motor-KONTAKTE
     = Montierte AUSSEN-Seite ...
       WINKEL der Kontakte relativ zur Horizontalen
  o  Uhr-Feder Vor-SPANNUNG ...
     = vor Positionierung !!! der HELIX mit MOTOR
  o  Position der HELIX auf Motor-ACHSE
  o  UNRUH-FEDER (+/-) Genauigkeit

N A C H T R A G :   Motor stoppte mehrfach, da zu schwach ...
        Statt 1.5 V D-Cell  ==>>  Li-Ion-Cell / 3.4 V / 1900 mAh
      ( wg. Sprung im Gehaeuse = roter Draht zur Stabilitaet ... )

                    

     Damit wurde »KUNDO«-"Arbeitspunkt" gefunden: Motor wird mit
     IMPULSEN ~10 mA * 1/4 sec mit ~5 Imp/min getrieben ...
     Wie lange reicht eine Li-Ion-Cell-Ladung?

     ((( ~10mA*0.25sec ) *5 ) *60 ) *24 )  =  18000 mAsec / Tag
                           ( 18000/3600 ) ===>  5 mAh / Tag
                               ( 1900/5 ) ===>  ~380 Tage > 1 Jahr
                                                =========
impressum:
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© C.HAMANN       http://public.BHT-Berlin.de/hamann       12/13/12