Originally Posted by
SteveH
yes, that is how it was supposed to work. This specific mechanism and it's issues is what lead to the marketing term (for companies not using this anymore) "Light Running" The effort required to use this original Howe design is significantly more than later drive methods.
BTW, this drive method is also used in the Patchers (29-4,etc) and any other place where solid drive force is needed. In the early days, a sewing machine had to be able to sew silk AND leather (really sew it) so these designs worked well. Once machines became more specialized (for home vs industrial/shop) this design was no longer optimal
Thank you. I'm going to guess that
should I be able to get it loose and off to clean that it would mess with the timing? The lavender arrow part does
not rotate at all. It is always facing the same way while completely going all the way around the track. The red arrows are a wire and do not go completely around the shaft. The left end is the one that goes into the shaft and the right one is loose.
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I tried to wrap a piece of bicycle tube around the lavender arrowed piece to see if I could get it to rotate -- no luck.
Janey - Neat people never make the exciting discoveries I do.