Feed BarThe feed bar (figure 4-6 [F]) transfers thepower and motion from the feed-driving rockshaftto the feed dog.Feed DogThe feed dog aids the needle in feeding thematerial to the machine. It is attached to the feedb a r lHook-Driving Shaft and Attached PartsThe removal of the hook-driving shaft (figure4-6 [N]) begins with the loosening of the attachedparts, starting from the right and working to theleft.. Loosen the setscrew and the spline screwin the hook-driving shaft bearing collar. (Seefigure 4-6 [O].). Loosen the two setscrews in the hook-driving shaft lock ratchet. (See figure 4-6 [P].)NOTE: Machines fitted with cast ironbushings instead of ball bearings will have onlyone spline screw.. Loosen the spline screw and the setscrewsin the feed-driving eccentric. (See figure 4-6([Q].)l Loosen the hook saddle pinch screw (figure4-6 [A]).l Loosen the two setscrews in the hook-driving gear.. Loosen the spline screw in the feed-liftingeccentric (figure 4-6 [T]).NOTE: After you loosen the spline screw andthe setscrews, each part must rotate freely on theshaft.Safety Clutch PulleyThe purpose of the safety clutch pulley (figure4-4 [D]) is twofold. First, it is used to transfer thepower and motion from the arm shaft connectionbelt to the hook-driving shaft; second, it protectsthe hook from being damaged by disengagingwhen the hook is jammed. To remove the safety4-26clutch pulley, you loosen the two setscrews (figure4-6 [S]) that attach the safety clutch pulley to thehook-driving shaft and withdraw the pulley.Feed-Lifting EccentricThe feed-lifting eccentric (figure 4-6 [T])supplies a lifting motion to the feed-liftingeccentric fork. Remove the feed-lifting eccentricby moving the hook-driving shaft to the right untilit clears the feed-lifting eccentric, thus allowingthe eccentric to drop from the shaft.Hook-Driving GearT 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 helongitudinal motion in the hook-driving shaft tothe horizontal motion on the sewing hook.Remove the hook-driving gear by moving thehook-driving shaft to the right until it clears thehook-driving gear, thus allowing the hook-drivinggear to drop from the shaft.Feed-Driving EccentricThe feed-driving eccentric sets up the motionand controls the feeding mechanism of the sewingmachine. Remove the feed-driving eccentric bymoving the hook-driving shaft to the right untilit clears the feed-driving eccentric, thus allowingit to drop from the shaft.Feed-Driving ConnectionThe feed-driving connection carries the feedingmotion to the feed-driving crank. Remove thefeed-driving connection simultaneously with thefeed-driving eccentric. Remove the connectionfrom the eccentric by withdrawing it from theeccentric.Feed-Driving CrankThe feed-driving crank transfers the feedingmotion from the feed-driving connection to thefeed-driving rockshaft. The feed-driving crank isattached to the feed-driving connection and isremoved from the sewing machine when youremove the feed-driving connection.Hook-Driving Shaft Lock RatchetThe hook-driving shaft lock ratchet locks thehook-driving shaft in position while you set thesafety clutch. Remove the hook-driving shaft
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