[amayausers.com] Re: Backing for Knitted Winter Hats
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- Date: Wed, 21 Oct 2009 16:08:15 UT
This message was posted by Rod or Sharon on AmayaUsers.com. PLEASE DO NOT REPLY
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I'm not ED, but....
In the beginning there was the light and then Melco begat Standard Acti-feed.
Standard then begat Auto Activ-feed and then all the little activ-feeds started
causing problems until some controls were exercised.
Standard Acti-feed prior to Auto Acti-Feed was all we had to use. In Standard,
you had to set your own material thickness setting based on the thickness of
the material being sewn on. We also had to either learn to use the "Settings by
Color" tool or babysit the machine to raise and lower the material thickness in
Standard manually to go over , for example, the center seam on caps.
Auto Activ-feed now does this little chore for you. The thread break sensor
bar/tube has two little extremely pressure sensitive crystals, one on each end,
that sense pressure changes from the up and down motion of the takeup levers.
Think of it like this. If you were sewing on a piece of broadcloth with no
seams, then you wouldn't see much change taking place within auto acti-feed
altho the amount of thread that is fed will/can/may fluctuate depending on
vertical columns, horizontal columns, etc...
If you are sewing on this piece of broadcloth with some cords trapped between
the backing and the broadcloth to simulate a ribbed effect, now the material
thickness will change everytime it encounters one of these bumps. As the
machine starts to encounter one of these "bumps" , on the upward throw of the
takeup lever, the thread will be pulled tighter against the threadbreak sensor
tube. This signals the machine to release more thread to compensate for this
change on the next downstroke of the takeup lever. This process will continue
until the maximum material thickness is reached and it starts down the other
side of the bump, whereby the process is reversed..i.e., less tension, less
thread.....
Auto Lower Limit.....this is nothing more than a tool that will allow you to
control how low the auto acti-feed can go to. There are times, like sewing
caps, that the default setting of 1, is just too low , the thread is just being
pulled too tight and thread breaks and/or fraying will occur. Auto lower limit
is used to control the machine from going below a given number. I will normally
use a number between 6 to 12 for various styles of caps...just have to see what
works for you as every machine is just a bit different.
If the Auto Lower limit is set too high, too much thread will be fed on thin
materials or thick materials for that matter, as auto can go up to 40. this
will cause loopy embroidery and/or false or real bobbin and/or threadbreaks....
It is a simple but complicated system that is affected by many varibles in the
machine, timmings, lubrication, thread, needles, bobbin tension is a biggie and
so on....
There is a lot more,but enough for now...I'll let Mr Ed go on from here....
Rod Springer
Amaya Tech & Trainer
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