Buren 1000

 
Buren 1000

Buren 1000

Description

The late 1950s were the high time of mechanical watchmaking. The movements from that time could still draw from the full, but were at the same time so advanced, that even today, they don’t feel old fashioned.

From that time, the Buren 1000 origins. It is a very flat microrotor selfwinding movement with 12 1/2 lignes diameter, from Dugena used as Dugena 1000.

With its red gold plating and the golden toned Glucydur screw balance, it appears of very high quality.

base plate

base plate

The base plate shows, that all important bearings contain rubies, except the center minute wheel and the mainspring barrel, which both rotate so slowly, that there’s no real need for a friction-reducing ruby bearing.

The fully integrated selfinding mechanismus, however, uses only one single jewel. This is not really perfect!

center minute wheel

center minute wheel

In the late 1950s, most movements still used a directly driven center minute wheel. The Buren 1000 was no exception here.

gear train

gear train

The gear train uses the conventional construction: The mainspring barrel drives the center minute wheel, followed by third wheel, seconds wheel and filigree steel escape wheel.

The indirectly center seconds indication is driven by a double third wheel, which reduces fluttering with its two wheels.

side view of the gear train

side view of the gear train

As escapement a swiss pallet lever escapement is used. It is regulated by a Glucydur screw balance, which is beared in two Incabloc shock protections.

The effective length of the hairspring can be adjusted with a long regulator arm and scale.

gear train w/o automatic

gear train w/o automatic

The mainspring barrel is located under a small bridge. The ratchet wheel is not directly driven by the crown wheel, but with a sliding wheel in between.

ratchet wheel with clutch

ratchet wheel with clutch

In order to decouple the manual winding from the self-winding movement, the ratchet wheel of the barrel has a two-tier design. The lower wheel is driven by the self-winding mechanism, but has no direct connection to the barrel core. The upper wheel, which is connected to the barrel core as well as to the sliding gear of the manual winding system, and which is engaged by the pawl, has a multi-plate clutch with which it engages the three holes of the lower ratchet wheel in one direction and in the other direction is running freely.

mounted ratchet wheel

mounted ratchet wheel

The selfwinding mechanism is pretty complex: The (here not yet mounted) microrotor sits on the axle of the innermist wheel and engages with an exchange wheel, which engages with a sliding pinion. This flying beared sliding pinion is reponsible, to either drive the inner or the outer exchange wheel, which are both connected. No matter in which direction, the oscillating wheel revolves, the upper exchange wheel always turns in the same direction and winds the mainspring with an additional reduction wheel (at position 12 o’clock).

not yet mounted oscillating weight

not yet mounted oscillating weight

As spectacular the view of the movement side is, as boring is it on the dial side. Of course, you can see a youke winding system (here with a broken and thus missing setting lever spring), and of course you can see the Incabloc bearing.

Of the selfwinding system, you can only see the sliding bearing of the sliding pinion at 1 o’clock and the outer exchange wheel (at 11 o’clock).

Buren 1000: Dial side

Buren 1000: Dial side

The Buren 1000 is probably the most popular movement from Buren (besides the Chronomatic series, which was developed together with Hamilton, Breitling and Heuer). Especially Dugena used this movement quite often in the top level “Super Automatic” series, which at least for Dugena marked their technical peak.

Since the 1960s, when the quarz watch became visible on the horizon, the red pencil was pulled out everywhere and so, this expensive movement was taken out of production pretty soon.

Technical data

Manufacturer:Buren
Caliber:1000
Size:12 1/2''' (measured: 28,3mm)
Height:4,2mm
A/h:18000
Number of jewels:21
Escapement:Pallet lever
Balance types: Glucydur screw balance (two legs)
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, center second pinion, third wheel
  • center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:
  • SCI (indirect center seconds)
  • AUT (selfwinding)
References: Ebauches: 1959 31
Flume: K2 114
Mentioning in literature (years): 1962
Inventory number:21005

Usage gallery

Dugena Super Automatic gents watch (case missing)

Dugena Super Automatic gents watch (case missing)

This movement is a kind donation from Mario. Thank you very much for your great support of the movement archive!

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