Adjustment Of The Pressure Of The Work Clamp Unit; Adjustment Of The Wiper Spring - JUKI LK-1900B series Instruction Manual

3-5. Adjustment of the pressure of the work clamp unit

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
The pressure of the work clamp unit should be minimized as long as the material does not warp during
sewing. Loosen adjusting screw ❶ and turn adjusting screw ❷ to obtain the aforementioned pressure.

3-6. Adjustment of the wiper spring

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
❷
❶
❷
❶
Wiper spring ❶ retains the needle thread after
thread trimming in between wiper ❷ and the wiper
spring. Correct properly the tension of wiper spring
❶ so that the tension at that time becomes 0.2 to 0.3N
(a little higher tension than that of the bobbin thread
coming out of the bobbin case).
If the retaining of the needle thread is ex-
cessive, the thread may protrude from the
upper side of the button.
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