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KUNDO  WORLD  TIME  CLOCK


            It is now   =   10:34   in  SanFrancisco
                        =   19:24   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.
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
build-in the motor (!)  On the motor axle is a helix-gear mounted.
This gear  drives the main-spring-wheel  and it is "clamped" by an
L-shaped lever.  The status in the picture  is just after winding:
The L-lever has pulled the motor axle to the left side - the rotor
is disconnected from power.  The silver wheel  with two "noses" is
the timer.  After 4 minutes  the noses move clockwise, the L-lever
get free  and moves right,  the motor axle  is pushed to the right
and get contact to power. The motor spins, wind up the main spring
and brings the right nose of the timer to the left side and there-
fore the L-lever back in its left position:  The motor axle shifts
left, the motor get out of contact - A new 4 minute cyle starts.

(B) REPAIR / RESTORATION:
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(1)
Cleaning all electric contacts between battery and motor...
(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.  A CLIP,  made out of CAT
FOOD CAN ( fixed with tape ), is now 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  is a  3-turn spring pressed over.  The position of
the helix-gear on the axle is part of the fine-tuning procedure!

impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann   11/11/11