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Working Principle of Sewing Machine ( Paddle Part )

  1. Jun 10, 2015 #1
    Hi guys,
    I wanted to ask something that im interested on
    Which is on the traditional sewing machine mechanical mechanism (On the foot paddle part)
    eccee90e9bacf36b622af9e31321be65.jpg
    Image taken from Google.

    From the image above, a typical sewing machine
    For such application, what is the "Name" for it?
    Im more likely wanted to know more about how do i calculate the force from paddle to the sheave

    P.S: I've been searching around the internet, all i got on the principle of the sewing machine is on its lock stitch
     
  2. jcsd
  3. Jun 10, 2015 #2

    SteamKing

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    The mechanism is called a "treadle":

    http://en.wikipedia.org/wiki/Treadle

    In the days before electric motors became common, the sewing machine operator would use a foot pressing on the treadle to turn a crank, located up above. Turning the crank converted the reciprocating motion of the treadle into a rotary motion used by the sewing machine on top.
     
  4. Jun 10, 2015 #3
    Thanks mate!
    I'll look into it
     
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