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KUNDO WORLD CLOCK
It is now = 10:34 in SanFrancisco
= 19:24 in Berlin
W O R L D 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.
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 ...
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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!