Table of Contents
Advertisement
3-6. Adjusting the looper thread cam
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
❶
❸
❺
Align the marker line with
the bottom end of the
thread guide.
3-7. Adjusting the feed dog height
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1.4mm
Feed dog
The top end of the feed dog should rise 1.4 mm above the surface of the throat plate when the feed dog is in
the highest position of its stroke.
■ Adjusting the feed dog height
1) Loosen screw ❶ in the side plate of the bed and remove it.
2) Remove the screw ❶ , and loosen a hexagon socket head screw under the screw ❶ with an L-shaped
hexagon wrench key.
3) Adjust the feed dog height by turning feed driving amount adjusting shaft ❷ .
4) Fix the shaft with the hexagon socket head screw and tighten screw ❶ .
❹
❷
❻
Position of the looper thread
can for cotton thread
Standard position
of the looper thread
cam
Throat plate
– 10 –
Loosen screw ❷ , and adjust looper thread cam ❶
so that the looper starts drawing the thread when it
starts returning to its home position after it has pro-
jected the most.
■ Adjusting the looper thread cam thread guide
1) Align the end face of thread guide ❻ to the marker
line on thread guide ❻ . Then adjust thread guide
❺ so that its end face is flush with the end face of
thread guide ❻ .
The standard position of the thread guide is ob-
tained when the end face of the thread guide is
aligned with the center marker line.
2) When using a cotton thread, loosen screws ❸
and ❹ , and align the end faces of thread guides
❺ and ❻ to the marker line located far side. At
this time, it is not necessary to re adjust the looper
thread cam timing.
❶
❷
Lower
Higher
Advertisement
Table of Contents
