Operation Manual

Operation
Operating manual 171/173 Version 01.0 - 01/2016 31
5.6.4 Adjusting the looper thread quantity
The looper thread take-up adjusts the looper thread quantity
to the relevant set stitch length so that the stitch pull is optimal
for every length and also for stitch condensing.
The looper thread take-up can be adjusted continuously on a scale
fro
m 0 to 5. The larger the value, the greater the re
leased thread
quantity and the more elastic the seam.
Correct setting
The correct setting is dependent on the stitch length and the seam
type ( 5.6.1 Thread types and stitch formation, pg. 28).
In particular for extreme settings, it must be
ensured that the looper
thread quantity is not too large:
Extreme
settings
• Elastic seam (largest possible thread quantity) with very short
stitch length
• Considerable enlargement of the stitch length for
elastic seams
Faults due to excessively large looper thread quantity
• Missed stitches
• Looper thread jumps off the thread pick-up disk
Risk of injury from moving parts.
Switch the sewing machine off before setting
the looper thread take-up.
WARNING