JUKI MF-7900 Series Engineer's Manual page 33

Adjustment procedures
6. Spreader thread guide
(1) Adjust the height of spreader ❶ to 7.8 to 8.2 mm. Loosen
setscrews  in the spreader thread guide and adjust the
clearance provided between the top surface of spreader ❶ and
spreader thread guide  to 0.4 to 1.0 mm.
(2) Needle clamp thread guide
Loosen setscrew  in the needle clamp thread guide and ad-
just the clearance provided between the needle clamp thread
guide  and spreader thread guide  to 0.8 to 1.2 mm.
(3) For the lateral direction, align the hole of needle clamp thread
guide  to the prolonged line of the slot of spreader thread
guide  .
(Caution) When adjusting spreader thread guide  in the lat-
eral direction, check whether there is any contact at
section D (left side of spreader thread guide  and
needle clamp  ).
Results of Improper adjustment
◦ When height or position of the
spreader thread guide  is im-
proper, stitch skipping of spread-
er thread will be caused.
◦ When height or position of the
needle clamp thread guide 
is improper, stitch skipping of
spreader thread will be caused.
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