Singer Centurion 121D - NEEDLE BAR FRAME AND THREAD TAKE-UP MECHANISM (Assembly)

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
ASSEMBLY SEQUENCE
NEEDLE BAR FRAME AND THREAD TAKE-UP MECHANISM
1. Mount and fasten throat plate to bed casting.
2. Take complete unit, as shown in Fig A, and insert into arm casting with studs No. 1, 2
and 3 entering simultaneously Make certain that the slotted portion of the needle bar
crank spacer, on stud No. 3, aligns with pin in counterbalance. Flats on all studs must
be positioned relative to its locking set screws
3. Locate frame and take-up unit so as to have the sewing needle positioned dead
center into the throat plate needle hole. Lock studs No. 1 and 2 in place with set
screws provided
4 Insert thread take-up hinge stud, with flats facing upward, through take-up mechan-
ism into arm casting and lock in place with both set screws. Replace thread guide.
5 Snug needle bar crank set screw on flat and snug needle bar crank pinch screw.
Loosen set screw. Tighten pinch screw and set screw in that order.
6. Insert oiling wick through hole in casting, through felt pad, back through hole in cast-
ing into take-up stud. See FIG B.
7. Wrap sucker wick around presser bar bushing, behind neecJle bar frame, around front
of frame and between presser bar bushing and side of needle bar frame. See FIG. B.
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FIG. A
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FIG. B
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