Presser Bar Spring Support Screw
The presser bar spring-support screw (figure
4-11 [G]) acts as a suspension point for the presser
bar spring. The screw is loosened approximately
one-fourth of- an inch to allow for the removal
of the presser bar spring. Do not remove the
p r e s s e r b a r s p r i n g - s u p p o r t s c r e w f r o m t he
machine.
Presser Bar Spring
The presser bar spring (figure 4-11 [H])
applies a constant pressure to the presser bar. To
remove the presser bar spring from the machine,
l o w e r t h e p r e s s e r f e e t a n d t h e n g r a s p t he
underside of the spring as near the support screw
as possible with two fingers of one hand over two
fingers of the other hand. Now slide the spring
outward to the head of the support screw,
rolling the spring up and out of the machine.
Presser Bar Lifting Releasing
Lever Bracket Guide Screw
The presser bar lifting releasing lever bracket
guide screw, (figure 4-11 [1]) acts as a track and
guide for the presser bar lifting releasing lever
bracket. Remove the presser bar lifting releasing
lever bracket guide screw by unscrewing it from
the machine.
Presser Bar Position Guide
The presser bar position guide (figure 4-7 [D])
acts as a track to control the presser bar position
guide lever. To remove the presser bar position
guide, you should loosen (six turns) the spline
screw on the rear side nearest the face of the
machine and push the guide through the recess
at the top of the machine head.
Presser Bar Position Guide Lever
The presser bar position guide lever is used to
align the presser foot, and it operates in the slot
of the presser bar guide.
NOTE: The presser bar position guide does
not screw out. Loosen the pinch screw on the
presser bar position guide lever (figure 4-11 [K])
by inserting the screwdriver into the opening on
the rear side of the machine head. This is
necessary to allow movement of the presser bar
for the removal of attached parts.
Alternating Presser Foot
The alternating presser foot is the rear presser
foot and holds the material in place while the
needle and front presser foot move forward
making another bight. To remove the rear presser
foot, you unscrew the presser foot position screw
on the left side of the presser bar. Raise the presser
bar to its highest position and remove the foot
from the rear.
Presser Bar Spring Bracket
The presser bar spring bracket (figure 4-7 [E])
transfers the tension from the presser bar spring
to the presser bar. To loosen the presser bar spring
b r a c k e t f r o m t h e p r e s s e r b a r , i n s e r t t he
screwdriver through the lower opening provided
in the back of the face of the machine. Loosen
the presser bar lifting bracket pinch screw (figure
4-11 [C]). Remove the presser bar lifting bell crank
retaining screw and lifting bell crank (figure 4-7
[F] and [G]). Now remove the presser bar (figure
4-7 [M]) in a slow upward motion.
Presser-Lifting Bell Crank
The presser-lifting bell crank alternately
applies lift to the presser feet. Remove the
presser-lifting bell crank retaining screw (figure
4-7 [F]) and then extract the bell crank (figure 4-7
[G]) from the machine.
Presser Bar Lifting Bracket
The presser bar lifting bracket is alternately
a hinge point and lifting point for the two presser
bars. It is also the controlling part for the presser
feet while work is being inserted and removed,
and it gives support to the thread tension release
slide.
CAUTION
If binding should occur while you are
r e m o v i n g t h e p r e s s e r b a r , i n s e r t a
screwdriver into the lower slot of the
presser bar and rotate it while applying
upward motion on the presser bar.
When you remove the presser bar, the
following parts will fall off: the presser bar
spring bracket (figure 4-7 [E]), the releasing
bracket, the releasing bracket spring, the
lifting bracket, and the guide lever.
4-22