The feed bar (figure 4-6 [F]) transfers the
power and motion from the feed-driving rockshaft
to the feed dog.
The feed dog aids the needle in feeding the
material to the machine. It is attached to the feed
b a r l
Hook-Driving Shaft and Attached Parts
The removal of the hook-driving shaft (figure
4-6 [N]) begins with the loosening of the attached
parts, starting from the right and working to the
. Loosen the setscrew and the spline screw
in the hook-driving shaft bearing collar. (See
figure 4-6 [O].)
. Loosen the two setscrews in the hook-
driving shaft lock ratchet. (See figure 4-6 [P].)
NOTE: Machines fitted with cast iron
bushings instead of ball bearings will have only
one spline screw.
. Loosen the spline screw and the setscrews
in the feed-driving eccentric. (See figure 4-6
l Loosen the hook saddle pinch screw (figure
l Loosen the two setscrews in the hook-
. Loosen the spline screw in the feed-lifting
eccentric (figure 4-6 [T]).
NOTE: After you loosen the spline screw and
the setscrews, each part must rotate freely on the
Safety Clutch Pulley
The purpose of the safety clutch pulley (figure
4-4 [D]) is twofold. First, it is used to transfer the
power and motion from the arm shaft connection
belt to the hook-driving shaft; second, it protects
the hook from being damaged by disengaging
when the hook is jammed. To remove the safety
clutch pulley, you loosen the two setscrews (figure
4-6 [S]) that attach the safety clutch pulley to the
hook-driving shaft and withdraw the pulley.
The feed-lifting eccentric (figure 4-6 [T])
supplies a lifting motion to the feed-lifting
eccentric fork. Remove the feed-lifting eccentric
by moving the hook-driving shaft to the right until
it clears the feed-lifting eccentric, thus allowing
the eccentric to drop from the shaft.
T h e h o o k - d r i v i n g g e a r c o n v e r t s t he
longitudinal motion in the hook-driving shaft to
the horizontal motion on the sewing hook.
Remove the hook-driving gear by moving the
hook-driving shaft to the right until it clears the
hook-driving gear, thus allowing the hook-driving
gear to drop from the shaft.
The feed-driving eccentric sets up the motion
and controls the feeding mechanism of the sewing
machine. Remove the feed-driving eccentric by
moving the hook-driving shaft to the right until
it clears the feed-driving eccentric, thus allowing
it to drop from the shaft.
The feed-driving connection carries the feeding
motion to the feed-driving crank. Remove the
feed-driving connection simultaneously with the
feed-driving eccentric. Remove the connection
from the eccentric by withdrawing it from the
The feed-driving crank transfers the feeding
motion from the feed-driving connection to the
feed-driving rockshaft. The feed-driving crank is
attached to the feed-driving connection and is
removed from the sewing machine when you
remove the feed-driving connection.
Hook-Driving Shaft Lock Ratchet
The hook-driving shaft lock ratchet locks the
hook-driving shaft in position while you set the
safety clutch. Remove the hook-driving shaft