Needle Thread Clamp Device; Thread Breakage Detector Plate - JUKI AMS-221F-2516 Instruction Manual

1-7. Needle thread clamp device

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
When thread is caught at top end ❶ of the thread clamp, thread clamp becomes incomplete and sewing
trouble at the sewing start will be caused. Thread waste and lint are likely to accumulate in the sections
which are shown in the circles. The sections should therefore be periodically cleaned by removing the
throat plate and by blowing air through hole ❸ by removing rubber plug ❷ (two locations).

1-8. Thread breakage detector plate

❶
❸
❷
❷
❶
❸
❷
1) Adjust so that thread breakage detector plate ❶
is always in contact with thread take-up spring
❷ in the absence of needle thread. (Slack :
approx. 0.5 mm)
2) Whenever the stroke of thread take-up spring
❷ has been changed, be sure to readjust
thread breakage detector plate ❶ . To make
this adjustment, loosen screw ❸ .
Adjust so that thread breakage de-
tector plate ❶ does not touch any
adjacent metallic parts other than
thread take-up spring ❷ .
– 89 –
❸