Hook-Driving Shaft and Attached Parts

Feed Bar The feed bar (figure 4-6 [F]) transfers the power and motion from the feed-driving rockshaft to the feed dog. 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 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].) l Loosen the hook saddle pinch screw (figure 4-6 [A]). l 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. 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 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. Feed-Lifting Eccentric 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. Hook-Driving Gear 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. Feed-Driving Eccentric 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. Feed-Driving Connection 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. Feed-Driving Crank 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