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Adjustment procedures
Results of Improper adjustment
1. Remove setscrews
❷
and remove needle cooler unit
❸
and
cam cover
❾
.
2. Adjust the height of rear needle guard
❶
with setscrew
❺
and
adjust the longitudinal position with setscrew
❼
.
❼
❺
❹
(Caution) After the adjustment, check by manual turning wheth-
er the top end of looper
❹
does not come in contact
with the needle.
3. When turning the rear needle guard cam
❻
in the direction of
rotation, the timing of rear needle guard
❶
is advanced, and
when turning it in the reverse direction, the timing is retarded.
◦ When the clearance provided
between rear needle guard
❶
and the needle is large, stitch
skipping, blunt blade point of the
looper, or needle breakage will
be caused.
◦ When the contact of rear nee-
dle guard
❶
with the needle is
strong, blunt needle tip will be
caused.
