JUKI MEB-3200 Engineer's Manual page 37

Adjustment Procedures
™ S and R type (long thread trimming)
Looper thread and gimp trimming is operated at the position of the
feed base origin.
1. Adjust so that looper thread and gimp are separated upward
and downward by thread handling plate 1.
2. Precisely hold looper thread between looper thread clamp fixing
plate 2 and looper thread clamp 3 of the plate spring and
gimp between looper thread clamp fixing plate 2 and gimp
clamp 4 of the plate spring.
3. Adjust so that the top end of counter knife 6 is aligned with
engraved marker dot 8 of moving knife 7 when the stroke of
looper thread trimming actuating arm 5 is maximum.
(Caution) When the cut end (thread waste) of looper thread
or gimp is clamped with looper thread clamp 3 or gimp
clamp 4, clamp failure occurs. As a result, stitch skipping
at the sewing start or defective stitches will occur. So,
remove the thread waste.
™ J and C type (short thread trimming)
(Caution) When the feed base is manually moved to the rear
until it will go no further, upper knife lower cover ! 3 rides
on the cloth cutting knife and remove presser unit !4 .
Looper thread and gimp trimming is operated at the position of
the feed base origin after the presser has been lifted.
1. Looper thread and gimp have been adjusted so that they are
separated from the cloth by thread handling plate !2 .
2. Driving link !0 is actuated and lower knife !1 and upper knife
9 engage with each other to perform thread trimming.
3. Upper knife lower cover !3 controls the variation of the remaining
looper thread when looper thread comes in contact with the blade
of the moving knife.
(Caution) At the time of delivery or when the following presser
sets are used, use the cloth cutting knife with the same
size as that supplied with the machine. If a cloth cutting
knife with different size is used, the knife unit breakage or
the like will be caused.
(Reference) In the state of the standard delivery of J type,
the presser of M set is installed and that of S set is installed
on C type. The sewing length can be changed as shown
below by installing the optional presser set and moving
the installing position of the knife unit only.
S set : 16 to 24 (26) mm
M set : 24 to 32 (34) mm
L set : 32 to 40 (42) mm
Numerals in ( ) parentheses are in case of
taper bar and without bartack.
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Results of Improper Adjustment
33
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