Singer Class 269w - Page 8

IQ_TIME THE FEED CAM
Tip machine back, loosen the three feed cam
screws U, Fig. 25 and turn cam clockwise for slower
feeding or counterclockwise for faster feeding.
Tighten the three screws U.
TO REMOVE AND REPLACE THE KNIVES
Tip machine bock and remove the two screws
G2, Fig. 26. Remove knife rock F2 by sliding it
up out of
engagement with knife holder pinion E2.
This causes pinion E2 to rotate so that screw QJ
is accessible. Remove screw QJ. Remove knives
C2 and 02.
To reassemble, position knives C2 and 02 and
replace screw QJ. Mesh first tooth of knife rack
F2 with first tooth of pinion E2 . Slide rack down
along driving
bar and replace screws G2.
TO ADJUST KNIFE POSITION
AND KNIFE PINION
Fig. 26 shows knife C2 (shuttle thread knife)
and knife
02 (needle thread knife) in stop position.
Teeth in knife holder pinion E2 and knife rack
F2 must be properly meshed without binding or
looseness.
To eliminate binding, loosen the two screws G2
and screw H2. Slide adjusting block J2 down.
To eliminate looseness, loosen the two screws
G2 and screw H2. Slide adjusting block J2 up.
After
adjustment, tighten screw H2, reposition
knife rack F2 and tighten screws G2.
TO TIME THE KNIFE
To time the knife, loosen nut V, Fig. 25, on
knife
roller. Move knife roller toward left for faster
knife action, or toward right for slower knife action.
Tighten nut V.
TO REMOVE ARM SHAFT END PLAY
Before any adjustment is made on the stop mech-
anism first check for arm shaft end play. End play
should be at a minimum without binding. To remove
end play, loosen arm shaft bushing set screw Q2,
Fig. 31, page 9 and turn hex support screw X2,
Fig. 27 inward. Tighten bushing set screw Q2,
Fig. 31. Recheck for a minimum of end play with-
out binding.
TO ADJUST THE TRIPPING MECHANISM
(For one or two-notch starting bell crank)
The tripping mechanism locks starting lever
F3, Fig. 27 into running position by means of bell
crank pawl A2, Fig. 28 and bell crank B2, Fig. 28.
Before adjusting, make sure rock shaft 03, Fig.
28 is free from binding, particularly at upper support
E3, Fig. 29, page 9.
To adjust starting pawl and tripping mechanism,
first loosen socket screw Z, Fig. 28. Set tripping
arm A3, Fig. 25 to trip point X, Fig. 25 and leave
approximately .010" between bell crank B2, Fig. 28
and bell crank pawl A2. Tighten socket screw Z,
Fig. 28.
8
Fig. 25. Timing
Q3
Fig. 26. Adjustment
of Knives
Fig. 27. Removing End Play
From the library of: Superior Sewing Machine & Supply LLC