Singer 81K70 - Page 9

II
To Set the Left Hand Looper
Turn the balanee whePI over from you until the ncediP bar i1;
in its luwcsl position. At this position, the looper poinl should
hP about :.\ in<"h Lo the left of !.he m•edle. Now turn t hP balance
wheel until t lw needle bar has risen :i'l inch from its lowest posi-
tion
and Lhe point of thl' looper should be at the center of the
nePdk. (Some threads and materials require more needle loop, in
which cas•~ the looper point can be set/,; inch from tlw TH'l'dle).
Tlw left hand looper should be se!. in the looper l'arrier by
nwans of the screw (A, Fig. 16), so thal !.he point of t lw looper
on its loop-laking stroke passPs as dose as pussible to lhe needle
wit houl striking it. The point of tlw right hand looppr or spreader
should pass at the reeess back of the left hand loopPr PYP as dose
as possible without touching it.
A variation in the amount
of the looper motion can
be obtained by adjusling
the ball stud (Q, Fig. 15).
To increa.<;e this motion,
loosen the set screw (R,
Fig. 15) in Lhe looper lever
and move the ball stud (Q)
inwardly or toward the
looper lever. To decrease
the motion, move the ball
stud outwardly or away
from Lhe looper lever. Afler
the desired moti<Jn has
been obtained, securely
I·u;. If>. To Ht;GIJLAH; 'JJIE LooPER lllonoN tighten the sel screw.
To Set the Front Feed Dog
The front feed dog should be set so that when it is raised to
its higlwst point by the feed lifting eccentric, the full (kpth of the
L<'elh wi II pro jed above the throat plate.
This ft·l'd dog can be raised or lowpred after loosening screw
(AA, Fig. !J). After making Lhe adjustment, securely tighten
this serew.
Hi
T U
FIG. 16. ADJUSTMENTS ON THE liiACHINE
To Adjust the Trimmer
The lower knife (B, Fig. 16) should always be fastened in posi-
tion when removing or replacing the upper knife. The lowPr
knife is adjustable to the right or left and its position governs the
position of the upper one, also the width of bight on the goods.
To Remove the Lower Knife (B, Fig. 16), loosen the thum!J
screw (T, Fig. 16) and draw the knife downwardly.
To Replace the Lower Knife, have the pressn foot and
feed down, press the upper knife holder (V, Fig. 16) toward the
balance wheel, and push the lower knife upwardly so as to touch
the presser foot without lifting it, then tighten the thumb scr<·w
(T, Fig. 16).
To Adjust the Trimmer Sidewise, loosen the thumb scn•w
(E, Fig .. 13) and move the extension bracket (D, Fig. 1:n to the
right or away from the upper knife, loosen the screw (lJ, Fig. Hi)
and. turn the thumb screw (S, Fig. 16) inwardly or outwardly
until the trimmer is in the desired position, then seeurdy tight <'Tl
the screw (U). Move the extension bracket (D, Fig. 1:\) ha<"k
toward Lhe upper knife, leaving just enough dearanc<' lwlw<·<·n
the upper knife and the bracket so as Lo allow free movPlll<'lll
of the upper knife, then tighten the thumb serew (!<:, Fig. 1:1).
From the library of: Superior Sewing Machine & Supply LLC