Singer Centurion 121D - SETTING NEEDLE BAR FRAME TIMING INDICATOR; SETTING NEEDLE BAR HEIGHT; (using timing marks); (without using timing mark)

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
Needle Bar ~
Frame Indicator o
FIG. A
Indicator ~@
Set Screw ~..__-~-.J
{JJ
Indicator
Set Screw
2.414 (61.32 mm)
for
"200
Variety Machine
2.51 4 (63.86 mm)
for· 300 ·
Variety Machine
Needle Bar ,,.-,....,.-_::-' Upper Mark
Frame Indicator- ~ ( 300· Variety Macl11r1e)
Center Mark
("200 Variety Macl1irie)
FIG. B
FIG. C
Needle Bar
Clamping Screw
16
SETTING NEEDLE BAR FRAME
TIMING INDICATOR
Gauge distance from throat plate seat to
bottom of needle bar frame timing indicator
is 2.414 inches (61.32 mm) for "200"
variety machines and 2.514 inches (63 86
mm) for "300" variety machines.
Raise or lower needle bar frame indicator
as required to obtain correct height setting
after loosening indicator set screw shown
in Fig A
SETTING NEEDLE BAR HEIGHT
(using timing marks)
"200" VARIETY MACHINES
Turn machine pulley slowly until needle
bar is at its lowest point. Loosen needle
bar clamping screw shown in Fig C and
raise or lower needle bar UNTIL THE
CENTER MARK IS LEVEL WITH THE IN-
DICATOR as shown in Fig B
"300" VARIETY MACHINES
Turn machine pulley slowly until needle
bar is at its lowest point. Loosen needle
bar clamping screw shown in Fig. C and
raise or lower needle bar UNTIL THE UP-
PER MARK IS LEVEL WITH THE INDICA-
TOR as shown in Fig B
SETTING NEEDLE BAR HEIGHT
(without using timing mark)
Remove face plate, slide plate and throat
plate
Wher. needle bar is at its lowest point (dur-
ing rotation of machine pulley), the gauge
distance from throat plate seat to needle
stop in needle bar is 1.031 inches (2619
mm) (Fig. C).
To set needle bar height, loosen the needle
bar clamping screw shown in Fig. C. Raise
or lower needle bar as may be required.
Securely tighten clamping screw. Replace
all parts previously removed.