SINGER 143G2 - Manual (Page 10)

To Set the Needle Bar
See that the needle Is up In the bar as far as It will ko .
There are two lines 3/32 Inch apart across the needle bar
about two Inches above the lower end. When the needle bar Is at
Its lowest position, the UPPER MARK should be Just visible at the
lower end of the needle bar frame.
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£2H<)3
Fig. 19. Face Plate Removed
In case the needle bar Is not correctly set, loosen the
needle bar connecting stud set screw (HI,Fig.19) and move the
needle bar to the correct position, then tighten the set screw.
TO SET A NEEDLE BAR WHICH HAS NO MARK: Set the needle bar so
that when It rises 3/32 Inch from Its lowest position, the eye of
the needle will be about 1/16 Inch below the point of the hook as
the hook point enters the thread loop.
To Set and Time the Needle Bar Frame
First turn the needle vibrator spindle head (A,Fig.2) all the
way to the right so that the needle will not vibrate when the ma­
chine Is running. A straight needle should now come In the cen­
tre
of the needle hole In the throat plate. If It does not,
loosen the set screw which holds the eccentric stud (Kl,Flg.l9)
ind turn the stud (KL) until It does, then tighten the set screw.
Now turn the needle vibrator regulating spindle head to the
left for the widest throw. Turn the machine pulley toward you
until the needle Is at Its lowest position. As the needle bar
starts to rise, the needle bar frame should start to move side-
wise. If It does not, advance or retard the vibrator gear pin­
ion (M,Flg. 5).
To Remove the Needle Vibrator Gear Shaft
Remove the needle vibrator regulating spindle head (A,Fig,2)
and the eccentric bracket cover (C,Flg.2); remove the locking and
adjusting
screws (A1 and Bl,Flg.20), also the screw and spring
(El). Loosen the two set screws In the gear (Dl) and remove the
needle vibrator gear shaft collar (L,Flg.3) at the back of the
arm, then draw the shaft out.
When replacing these parts be careful that the large washer
(Cl,Fig.20) Is In place between the gear and arm, that the posi­
tion screws are set firmly against the flat spots on the shaft
and that the set screws are at the right of the position screws
when the shaft has been returned to Its place.
TO SET THE NEEDLE VIBRATOR REGULATINO SPINDLE HEAD SO
THAT A WIDER THROW THAN THE OJE DESIRED CANNOT BE MADE:
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Fig. 20. Transparent View Showing the Needle Vibrator
Regulating Spindle Head In Front of Machine
Turn the spindle head (A,Fig.2) to make the widest bight
possible; remove locking screw (Al,Flg.20) and turn In screw (Bl)
until the stitch Is of the width desired; then turn screw (Al)
down tightly on screw (Bl) as a check. The width of stitch may
then
be decreased by turning the regulating spindle head, but
operators cannot make stitches wider than the adjusting screw
(Bl) Is set to produce.