EB 1575N

 
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EB 1575N

Description

In the late 1950ies, when selfwindig movement were en vogue, the swiss Ebauches Bettlach, which, due to certain laws, was only allowed to product pin lever movement, also released an own selfwinding movement - the caliber EB 1575N described here. This movement bases on the handwound caliber EB 1504.

base plate

base plate

Unlike the caliber 1504, the diameter of the base plate was increased from 8 12 to 11 12 lignes to offer enough space for a large oscillating weight.

gears and trains

gears and trains

The gears and trains are still a Roskopf construction with only three gears. Additionally, the indirect center seconds indication is driven by the outer gears of the second wheel, which runs counter clockwise and with a different rotation speed.

side view of the gears and trains

side view of the gears and trains

Thr ring balance in beared in two KIF Protechoc shock protection bearings, which contains metal plates instead of synthetic rubies. Unlike a true Roskopf movement, it already beats with 18000 A/h. The movement is regulated then by a pin lever.

EB 1575N without selfwinding mechanism

EB 1575N without selfwinding mechanism

There are no bearing rubies in that movement, only the ellipse stone of the balance is made of synthetic ruby.

selfwindig module

selfwindig module

The selfwindig mechanism is simple but efficient: The oscillating weight has got a sliding clutch, which is responsible for the unidirectional winding and the decoupling when the movement is hand wound. With only two reductions gears, the energy is transmitted to the mainspring wheel. To avoid a backwards running oscillation weight, a pawl is attached to the gear next to the oscillating weight.

inside of the oscillating weight

inside of the oscillating weight

On the yet empty dial side, you can see the bridge for the center seconds indication and the bearing axels for minute and hour wheel.

empty dial side

empty dial side

As usual on Roskopf movements, minute and hour wheel are directly driven by the mainspring barrel, on which the driving and changing wheel is frictionally coupled.

EB 1575N dial side

EB 1575N dial side

The setting lever spring is uniquely shaped and contains on its lower side an own spring. So it doesn’t require any external springs.

Technical data

Manufacturer:EB
Caliber:1575N
Number of jewels:1
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): KIF Protechoc
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, mainspring barrel
Construction type:pillar construction
Winding mechanism:yoke winding system
Features:SCD,AUT
Functions:hour, minute, second, selfwinding
A/h:18000
Size:11 1/2'''
Production period:1958 - 196x
Literature: Flume: K2 1962 77

Usage gallery

Continental Automatic gents watch

Continental Automatic gents watch