27
3) Adjust looper stroke
A. Locate the needle bar at the lowest point when the needle is at the left side. Use calipers to measure the distance from the
end of the needle bar① to the upper side② of the needle bar bracket.
B. Add 3mm to the value measured in A.
C. Make the end of calipers (A) contact the upper side② of the needle bar bracket. Turn the upper pulley to make the end of
the needle bar① contact the edge of calipers(B). Check whether the end of the left looper is touching the center of the
needle.
D. Repeat the above procedures to check whether the end of the right looper is touching the center of the needle in case
where the needle is at the right side.
E. If the end of the looper doesn’t meet the center of the needle, lift the body of the machine.
F. Loosen the two screws③ of the lower axle timing belt, hold the hand pulley to fix it and then turn the lower cam in the
direction of the arrow to make the end of the looper (left)⑤ contact the center of the needle. When they are matched,
tighten the two screws③.
G. Check if the right degree of pressure is put on the screws.
[ Fig. 29 ]
[ Fig. 30 ]
①
③
④
⑤
②
(A)
(B)
3mm
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