Kienzle 057/21d

Kienzle 057/21d
Kienzle 057/21d

Description

The Kienzle caliber 057/21d, the so-called Volksautomatik, which was launched in the mid fifties, was the only inhouse selfwinding movement of the german watch factory, locaed in Schwenningen.

Unlike the handwound watches by Kienzle, the Volksautomatik cost with 65.- DM twice as much, what is the reason, why it is relatively rare and already put out of production in 1963.

movement view without oscillating weight
movement view without oscillating weight

The caliber 057/21d is a real inhouse construction, which had a better quality, than the handwound movements.

oscillating weight
oscillating weight

The oscillating weight is axle-beared and contains a lead circlet.

selfwinding mechanism, top
selfwinding mechanism, top

The selfwinding mechanism can be released as a unit from the movement by removing three screws.

selfwinding mechanism, inside
selfwinding mechanism, inside

The flying beared changing wheel, which is driven by the oscillating weight, drives in both directions one of the two wheels and realizes the bidirectional winding. The disadvantage of this solution is, that it has got a rather long empty running way, so when the oscillating weight changed its direction, it spins freely quite a long time.

selfwinding mechanism
selfwinding mechanism

The upper ratchet wheel is exclusively driven by the selfwinding mechanism with the help of a reduction wheel.

click of selfwinding mechanism
click of selfwinding mechanism

The click on the leftmost driving wheel avoids unwanted running down.

click of selfwinding mechanism, below
click of selfwinding mechanism, below

With the exception of the flying beared wheel, all other gears are located in ruby bearings.

movement without selfwinding mechanism
movement without selfwinding mechanism

A coupling, which is simple and genious the same time is used for the upper ratched wheel: Not the ratchet wheel, but only the barrel axle with its connected slide coupling in attached to the barrel arbour. When manually wound, it decouples the selfwinding system; when wound by the oscillating weight, it connects.

gears and trains
gears and trains

As you can see, the wheel mechanism of the Kienzle 057/21d bases on the caliber 48.

gears and trains, side view
gears and trains, side view

The time mechanism consists of: Mainspring - minute wheel - third wheel - fourth wheel (decentral second ) - escapement wheel.

escapement
escapement

The Kienzle 057/21d uses a ruby pin-lever, which is developed inhouse. It's a good compromise between the expensive and sophisticated swiss pallet lever and the cheap, but unprecise pin lever with metal pins.

escapement lever
escapement lever

The pins have got the shape of half of an cylinder, of the escapement wheel teeth matcg perfectly.

According to Kienzle, this type of escapement shall be equivalent to a swiss pallet lever excapement.

main plate
main plate

Of couse, on this movement, all bearings contain rubies; the ring balance is secured by two inhouse shock protections, where the protection on the dial side only offers protection against frontal shocks and not against side shocks.

The mainspring barrel with its towing spring can be released as a whole by pulling a spring at "12".

dial side view
dial side view

On the dial side, you can see the rocking bar winding mechanism and the click mechanism. It is a well made construction.

screwable dial foot
screwable dial foot

A very odd detail are the dial feet, which are held by screws(!) on the movement plate.



Technical data

ManufacturerKienzle
Caliber057/21d
Number of jewels21
Escapementpin lever
BalanceNickel
Shock protection(s)Kienzle
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Construction typepillar construction
Bridge shapefull plate including esc.wheel, escapement with own cock, 4 gears
Winding mechanismRocking bar
Featuress,a
FunctionsHour, minute, small second, selfwinding
Beats per hour18000
Size123/4''' (measured: 29,6 mm)
Production time1956-1963
Factsheet

Test Results

The specimen tested here came into the lab without case. It got a full service, but the oiling of the escapement pins was non trivial and maybe not optimal done, too.

Timegrapher Protocol

The timing results are quite OK, especially for a pin lever movement.
Probably due to the problematic oiling of the release pin, they are worse than they have to be.

dial down
dial down

dial up
dial up

12 up
12 up

3 up
3 up

6 up
6 up

9 up
9 up

Measured Values

horizontal positions
dial down  +-0 seconds/day
dial up  -8 seconds/day
vertical positions
12 up  -60 seconds/day
3 up  -65 seconds/day
6 up  +10 seconds/day
9 up  -5 seconds/day
timegrapher measurings

A maximum deviation of 75 secs of all positions os not bad, and since the rest of the deviations are quite small, it shows the potential of the Kienzle ruby pin-lever mechanism.

Usage gallery



Links
Ranfft Uhren: Kienzle 057/21 (de) (en)