JUKI LH-4128-7 Engineer's Manual page 47

Adjustment Procedure
3) Adjusting the thread presser spring
1. Insert a rod (thin rod, wrench, etc.) into adjusting hole
presser spring base
wrench key of 1.5 mm.
2. Adjust the thread presser spring by rod
mark A, and fix it with setscrew
(Caution) Clamp trouble occurs even when the thread presser spring
pressure is excessive or insufficient. So, be careful.
, and loosen setscrew
in the direction of arrow
.
Results of Improper Adjustment
in thread
with a hexagonal
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