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1) Perform the adjustment by the setscrews. Position of the needle thread
guide
and needle thread take up
lever is a very important decisive
factor when making soft chains since the needle thread take-up
amount is increased in this case. So, carefully position these parts.
2) Set distance I a little smaller when using
synthetic thread or the like which tends to form
stitches swelling out of the cloth edge.
A smaller I is effective for preventing stitch skip-
ping.
3) Distance J is related to the vertical knotting point
of the upper and lower looper threads.
Set this distance larger for wooly thread, and set it smaller for thin
thread which is likely to cause stitch skipping.
4) It is desirable to set distance K larger for stretchy threads such as
wooly thread.
5) Set distance L a little larger when making blind hemming soft chain
stitches.
6) Set distance N a little smaller for blind hemming or making soft chain
stitches.
7) Set distance O larger if stitch skipping occurs due to looper thread
slack.
Set it smaller for better appearance and touch of produced stitches
when wooly thread is used.
o Distance
a
When set smaller, better tight-
ness of needle thread stitches
will be obtained.
When set larger, loose needle
thread stitches will result.
o Distance E, F and H exert least
influence on stitch formation,
however, improper setting of
these distances will cause con-
tact between the moving parts.
o Distance J
When set larger, the amount of
the upper looper thread will be
increased.
When set smaller, the amount of
the upper looper thread will be
decreased.
o Distance K
When set larger, the amount of
the upper looper thread will be
increased.
When set smaller, the amount of
the upper looper thread will be
decreased.
o Distance L
When set larger, the amount of
the upper looper thread will be
increased.
When set smaller, the amount of
the upper looper thread will be
decreased.
o Distance N
When set larger, the amount of
the upper looper thread will be
increased.
When set smaller, the amount of
the upper looper thread will be
decreased.
o Distance I
When set larger, the amount of
the upper and lower looper
threads will be increased.
When set smaller, the amount of
the upper and lower looper
threads will be decreased.
o Distance O
When set larger, the amount of
the upper and lower looper
threads will be decreased.
When set smaller, the amount of
the upper and lower looper
threads will be increased.
Swell out
Adjustment Procedure
Results of Improper Adjustment
Needle thread take-up amount
a
Large
Small
Lower looper
Thread slack
Upper looper
Upper looper
Needle
Thread slack
Summary of Contents for MO-6700D Series
Page 49: ...45 2 Upper looper components...
