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sewing machine speed control

Discussion in 'Electrics UK' started by SparkyTris, 29 Oct 2019.

  1. SparkyTris

    SparkyTris

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    I opened up a 1970s vintage sewing machine treadle the other day expecting to find some triac type chopper controller but instead found a weird plunger type of thing with what looks like carbon rods either side.

    what's the mechanism?

    I guess I should post a pic but its in the shed and I cant be bothered to at the moment
     
  2. ericmark

    ericmark

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    Many old sewing machines it was a simple resistor, Phaff was one of the first with electronic control, that was mid 80's.
     
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  4. SparkyTris

    SparkyTris

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    a simple resistor eh?
    what about a complicated resistor?
    Guess this must be something like that. a pressure-varying resistor I suppose. don't they get a bit hot?
     
  5. Harry Bloomfield

    Harry Bloomfield

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    Just a variable resistance. Well worth the effort of converting one to a modern triac control.
     
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