Singer 281-21 - CHECK SPRING AND FEED DOG SETTINGS; Setting Check Spring Height and Tension; Setting Feed Dog Height

SETTING THE CHECK SPRING HEIGHT
Thread the machine. Turn machine pulley over
slowly toward operator, observing check spring shown
in Fig. 34.
When take-up lever begins to rise, check spring
should make a slight dip and return to its higher posi
tion.
As take-up lever approaches top of its stroke, set
ting the stitch, check spring should be drawn all the
way down.
CHECK SPRING
HIGHER
Dtp
STUD
i; LOWER
Fig. 34. Check Spring
STUD
SET SCREW
1/32" FOR "WASH AND WEAR"
1 MATERIAL
FEED DOG TEETH
PARALLEL TO
THROAT PLATE
if
THROAT
3/64" FOR ALL OTHER MATERIALS PLATE
Fig. 35. Correct Height of Feed Dog
HINGE PIN ECCENTRIC
HINGE PIN ECCENTRIC
14
FLAT
SET FOR 3/64" RISE SET FOR 1/32" RISE
Pig. 36. Feed Bar Hinge Pin (Eccentric)
As take-up lever descends, check spring should
return to rest.
To increase or decrease height of check spring
(which respectively increases or decreases its move
ment), loosen stud set screw shown in Fig. 34. Turn
stud along with entire check spring assembly to set
check spring height as required. Securely tighten set
screw.
NOTE: Height setting should be checked each time a
different presser foot is used with machine.
SETTING THE CHECK SPRING TENSION
Tension on check spring should be sufficient to
insure action at top speed but light enough to allow
check spring to be drawn all the way down.
To adjust, first make certain that stud set screw
shown in Fig. 34 is securely tightened. Then, using a
screwdriver in slot of stud, turn stud alone toward left
to decrease tension or toward right to increase tension.
SETTING THE FEED DOG HEIGHT
Feed dog height should be adjusted with machine
set for longest stitch. ALL the teeth of the feed dog
should rise equally high above the throat plate, as
shown in Fig. 35.
The correct height of feed dog for wash and wear
fabrics is 1/32 inch above throat plate.
For all other fabrics the correct height is 3/64 inch
above throat plate.
To set feed dog at correct height, loosen the two
hex-head screws shown in Fig. 37.
To obtain a height of 3/64 inch above throat plate,
turn hinge pin eccentric, Fig. 36, until flat on slotted
end is at top as shown.
To obtain a height of 1/32 inch above throat plate,
turn hinge pin eccentric until flat is at bottom.
To
raise or lower the REAR END of feed dog, turn
hinge pin
eccentric out of set position, as required.
From the library of: Superior Sewing Machine & Supply LLC