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 barl
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 left.
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 ([Q].)
Loosen the hook saddle pinch screw (figure 4-6 [A]).
Loosen the two setscrews in the hook- driving gear.
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 shaft.
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 4-26 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.
The hook-driving gear converts the 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 eccentric.
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.
The hook-driving shaft lock ratchet locks the hook-driving shaft in position while you set the safety clutch. Remove the hook-driving shaftContinue Reading