Singer 236w Service Manual And Parts List page 11

9
TO ADJUST THREAD TAKE-UP SPRING
The take-up spring S2, Fig. 23 should usually
have just enough movement so that it will be through
acting and will rest against upper end of spring reg¬
ulator R2 when needle is 1/16 inch above material
on its downward stroke. The spring should act a slight
amount as the thread passes around the bottom of the
hook and also as the thread is cast off the hook.
To set take-up spring, loosen set screw
and, by means of stud U2, position spring regulator
required. Then tighten screw T2.
T2
as
TO ADJUST THE BOBBIN CASE OPENER
Remove slide plate and loosen hook post
screws N2, Fig. 22. Set bobbin case opener P2 so
that it touches the bobbin case Q2 as lightly as pos¬
sible, yet turns the bobbin case enough to make a suf¬
ficient opening for free thread passage between throat
plate and bobbin case. Then tighten screws N2 and
replace slide plate.
Fig. 22
Fig. 23
To regulate tension on take-up spring, first
be sure screw T2 is tight. Then turn stud U2 over to
the left to increase tension or over to therightto de¬
crease' tension.
The take-up spring may require different ten¬
sion settings for different sizes of thread; heavy
thread requires more tension than light thread.
The above instructions apply to average sew¬
ing. Adjustments in both stroke and tension may
have to be made to suit special conditions.