42
PFM-4000
Part Number 6Z8303
Sewing Adjustments
Adjusting the Overedge Needle Thread Tensioner
This tensioner is one of three tensioners located on the front of the sewing head.
It is the first (left) knob. Adjust the tensioner as needed so that the thread is
pulled through lightly.
Figure 6.10
Tensioners
Testing Thread Tension
To test thread tension, sew a short strip of flange. If the seam stitching puckers on
either the top or bottom, then both upper and lower tensions are too tight. If the
bottom thread loops, tighten the upper thread tension and repeat the test. If the
top thread lays on top of the fabric, loosen the upper thread tension and repeat
the test. Make any adjustments as necessary.
Adjusting Thread Take-up
Thread take-up recovers the amount of loose thread created by the loopers and
the feeding motion. The PFM-4000 Flange Machine has two types of take-up, the
needle thread take-up and the looper thread take-up.
The needle thread take-up and thread guide may be adjusted to increase or
decrease the amount of thread pulled at the top of the needle bar stroke.
The looper thread take-up and thread guide may be adjusted for handling more
or less thread, according to the thickness of material and the length of the stitch. It
may also be adjusted to change the ratio of looper thread in the finished stitch.
overedge
needle
thread
tensioner
safety stitch
needle thread
tensioner
overedge looper
thread
tensioner