JUKI LH-4128-7, Engineer'S Manual

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Adjustment Procedure
Results of Improper Adjustment
o LH-4128-7, 4168-7, 4188-7
The lap lifter and the thread tension release are not interactive at the time
of shipment.
When loosening the thread, press the disc releasing plate to lift the
disc.
1. When interlocking the thread tension release
(1) Remove the rubber cap.
(2) Mount and fix the hexagon socket head cap screw (supplied).
(Caution) 1. Thread slacks when turning cloth at the corner stitch-
ing, and sewing trouble of thread tension release may
occur.
2. When the wiper is not used at the time of thread trim-
ming, needle thread may be drawn out when removing
cloth.
3. When removing the hexagon socket head cap screw
, make sure not to drop it in the machine head.