JUKI MEB-3200 Engineer's Manual page 59

Adjustment Procedures
1. Loosen setscrew 2 and fully move link B 6 to arrow mark F
side (upward) (adjust the haul amount of looper thread to the
maximum). Then temporarily tighten setscrew 2.
2. Loosen two setscrews ! 2 in looper thread haul driving arm 5
and determine the upward/downward and right/left position of
looper thread haul driving arm 5. Then tighten the setscrews.
1) Provide a clearance of 0.5 mm between looper thread haul
driving arm 5 and link B 6 and make clearance E with
looper bracket 4 equal on the left and right sides.
(Caution) 1. Turn looper bracket 4 by hand and make sure
that looper thread haul driving arm 5 does not
come in contact with the bracket at right/left
(section E) and top/bottom positions (clearance
of 0.5 mm section).
2. When adjusting, perform the adjustment when
looper thread haul plate 1 comes in contact with
stopper 7 by means of return spring 3 (looper
thread haul OFF). In addition, perform the
adjustment in the state that the power is turned
OFF and the air pressure is supplied (needle
thread trimming vertical moving arm !3 is raised).
3. Apply a small quantity of grease to the bottom
face (contact face with the link B 6) of looper
thread haul driving arm 5.
4. Loosen setscrew 2 and adjust the haul amount
of the looper thread with link B 6 referring to
the item "(24) Adjusting the haul amount of the
looper thread (long thread trimming/short thread
trimming)".
Results of Improper Adjustment
™ If upward/downward clearance
of 0.5 mm is larger than the
specified value, it is not possible
to greatly adjust the haul
amount of looper thread.
™ When looper bracket 4 rotates,
it comes in contact with looper
thread guide !4 and defective
rotation will be caused.
™ If upward/downward clearance
of 0.5 mm is smaller than the
specified value, or the parts
come in contact with each other,
it is not possible to decrease the
haul amount of looper thread.
™ When looper bracket 4 rotates,
it comes in contact with looper
thread haul driving arm 5, and
defective rotation, occurrence of
noise or defective sewing will be
caused.
™ If clearance E is not equal on the
both sides, when looper bracket
4 rotates, it interferes with looper
bracket 4 and looper thread
guide !4 . As a result, defective
rotation will be caused.
™ Looper thread haul driving arm
5 comes off link B 6 according
to the angle of looper bracket. As
a result, looper thread haul
motion failure will be caused.
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