Fusee cone assembly help needed....

Discussion in 'Watch Repair' started by Skutt50, Feb 22, 2017.

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  1. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    I am working on an old Fusee watch and am stuck on the fusee stop mechanism.
    I have not seen this type before and I am not even sure it is complete but hopefully someone here knows better what I have on my desk!

    There is no conventional fusee stop mechanism. Instead I found the parts in the picture below. Part marked B fell out when I disassembled the movement! I have a hunch that somehow part B should fit in D and work by stopping against A when the chain is close to full wind. The small spring C was found in the slot at D when I opened the lid, but I have no clue to how all of this is interacting!


    [​IMG]
    Anyone here who is familiar with this set up and can guide me to how they are assembled?
     

    Attached Files:

  2. gmorse

    gmorse Registered User
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    Jan 7, 2011
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    Hi Skutt,

    Part B should be straight and not bent as far as I know, and just slide across the top of the fusee when the chain reaches it.

    Fusee_Exploded_View.jpg

    Regards,

    Graham
     
  3. Skutt50

    Skutt50 Registered User

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    Super Graham

    I kind of expected you to help out in this. Many thanks.
    The movement came with a broken chain so the fuse slide may have been bent during the unwind! I will straighten it and see if I can get it back in action.

    Right now I have the pleasure of repairing the chain which includes making a new hook for the barrel. Whish me luck!
     
  4. Skutt50

    Skutt50 Registered User

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    Just to let you know, it worked out nicely. Once I straightened the bent fusee slide everything made sense and it was easy to put it back together........ Everything looks great, the chain is repaired and I now need to make the barrel hook before testing the full movement.

    Thanks for your help Graham.
     
  5. gmorse

    gmorse Registered User
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    Hi Skutt,

    These stop mechanisms seem to be commoner in French and Swiss fusees like yours than in English ones.

    Regards,

    Graham
     
  6. klokwiz

    klokwiz Registered User
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    Feb 4, 2009
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    Skutt,

    Good job on restoring this to service. like yourself i had not seen this type of locking device. I wonder how many other versions there are? Maybe Graham could chime in?

    Joe
     
  7. Skutt50

    Skutt50 Registered User

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    Interesting question Joe,

    I can't recall any other than the "conventional" arm that is pushed by the chain when close to full wind, and this!
    (After having fixed this I got a hunch I had seen one of these a long ago but I had no memory of it!)
     
  8. gmorse

    gmorse Registered User
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    Hi Joe,

    Like Skutt I've only seen the usual English stop work with a pivoted lever under the top plate, and much less commonly this sliding bar mechanism. Oh, and I seem to recall seeing Geneva stop work on a fusee somewhere a long time ago, but that was on a clock I believe.

    Regards,

    Graham
     
  9. Skutt50

    Skutt50 Registered User

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    Hi Graham

    Geneva Stop Work on a fusee. Interesting.

    Do you remember where it was mounted? On the fusee I would imagine or the chain would live a dangerous life.
     
  10. gmorse

    gmorse Registered User
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    Hi Skutt,

    Yes, it would have to be on the fusee!

    Regards,

    Graham
     
  11. SKennedy

    SKennedy Registered User

    Jan 5, 2017
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    There's a slight variation to the 'normal' fusee stop work for watches/chronometers with reverse fusees. As it reaches the top of the fusee, the chain raises a sprung lever but instead of the cam/stop piece on the fusee cone butting into it in compression, the lever part has a slightly undercut end piece which is caught by the stop piece and puts it in tension. Its done this way simply because the fusee and barrel rotate in opposite directions in this circumstance rather than in the same direction as in an 'ordinary' watch.

    IMG_4091.JPG
     
  12. gmorse

    gmorse Registered User
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    Hi Seth,

    I think this is a very elegant solution to that particular problem, which would otherwise need a more complicated layout.

    Regards,

    Graham
     
  13. SKennedy

    SKennedy Registered User

    Jan 5, 2017
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    I was looking at this movement a couple of days ago and remembered this discussion. Geneva stopwork on a fusee. 6 notches in the star to allow for 5 turns and the finger piece on the fusee arbor is a quite different shape to the more usual.

    View attachment 338969

    View attachment 338970
     
  14. Skutt50

    Skutt50 Registered User

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    Thanks for the pictures SKennedy.

    This might been the solution Graham mentioned in his posting #8 above.
    Quite a nice solution to save the chain in a fusee movement.
     
  15. Michael Maddan

    Michael Maddan Registered User

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    Having seen the Geneva stop for the first time in SKennedy's Post, I can only wonder: why didn't this excellent idea show up far, far more often...it seems an almost Perfect Design ! Michael.
     
  16. gmorse

    gmorse Registered User
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    Hi Michael,

    I suspect it's mostly about "not invented here" as far as the English trade was concerned. Many Swiss watches with this stop-work that are seen in the UK have had it partially or wholly removed.

    Regards,

    Graham
     
  17. Skutt50

    Skutt50 Registered User

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    It just struck me that this design actually provides an improvement in functionality since you have type of a wind indicator!
     
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