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pgf

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Reply with quote  #1 

One of the things I love about collecting early sewing machines is getting to watch the progress of the
technical development of the machines.  My new Biesolt & Locke "Wettina" is a nice example.

Basically, the Wettina is a clone of the Singer VS3/28.  But B&L was able to improve on the Singer design, and created an automatic tension release mechanism, with what amounted to one hole drilled in the casting and a piece of bent coat-hanger.  (Okay, maybe it wasn't a coat hanger.)

Here are three pictures.  The first is of my VS3.  The next two are of the Wettina, first with the presser foot down, and then up.  If you look very closely you can see that when raised, the "rear" end of the presser foot lifter pushes on the piece of bent wire, which causes the other end of the wire to push on the tensioner's locating finger.  Simple, and effective.

cmp3_vs3_behind_face.jpg cmp4_wettina_tensioned.jpg cmp5_wettina_released.jpg 

Singer added the more familiar tension release, with the lever acting on the central pin, when they released the 128/127 machines.  Since I don't know how old my Wettina is, I can't really say whether B&L had seen that design or not.  Either way, their implementation wins big points for simplicity.

paul




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Chaly

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Reply with quote  #2 
I always wonder how new VSM features came about.  I can't imagine product focus groups or even a product manager - but maybe?  Any avenues for customer feedback?  Or likely product evolution was driven by the competition or ways to sell more or get more market share?
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pgf

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Reply with quote  #3 
Yes, that's a good question.  Could just have been the designers' wives.  :-)    (And I think I'm safe in my gender assumptions, in this case.  ;-)  )
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Mavis

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Reply with quote  #4 
There has always been that person who strives to build a better mouse trap!  (or sewing machine)
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Mavis
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