the arm shaft, grasp it with the left hand and withdraw it from the face of the machine. Right- and Left-Hand Bed Slide Plates The bed slide plates allow for inspection and maintenance of the bobbin assembly. The right- hand bed slide has a cutout on the bottom side. This cutout allows the needle thread to pass over the bobbin case without jamming. Throat Plate The throat plate acts as a guide for the feed dog and provides a firm foundation over which the material may flow while the stitch is being made. The throat plate does not need to be removed from the machine. Needlebar Rock Frame Rockshaft The needlebar rock frame rockshaft carries the feeding motion and power from the feeding mechanism in the bed of the machine to the needlebar rock frame. To remove the needlebar rock frame rockshaft, you insert the screwdriver in the opening in the rear of the uprise and loosen the needlebar rock frame rockshaft crank pinch screw. R e m o v e  t h e  n e e d l e b a r  r o c k  f r a me rockshaft from the face of the machine. Needlebar Rock Frame Rockshaft Crank and Connection The needlebar rock frame rockshaft crank and connection transfers the feeding motion and power from the feed-driving rockshaft crank to the needlebar rock frame rockshaft. To remove the needlebar rock frame rockshaft crank and connection, you loosen the pinch screw at the feed-driving rockshaft crank (figure 4-6 [G]). Then you grasp the feed-driving rockshaft crank (figure 4-6 [H]), slide it to the right to remove it from the feed-driving rockshaft, and withdraw it from the machine. In so doing, the needlebar rock frame rockshaft crank and connection parts are also removed. The parts removed remain as an assembly. Feed-Driving Rockshaft Crank The feed-driving rockshaft crank transfers the feeding motion of the feed-driving rockshaft to the needlebar rock frame rockshaft crank and connection. The feed-driving rockshaft crank is removed simultaneously with the needlebar rock frame rockshaft crank and connection. Feed-Lifting Cam Fork The feed-lifting cam fork gives the feed dog its up and down motion during the feeding operation. To remove the feed-lifting cam fork, you unscrew the feed-lifting cam fork screw (figure 4-6 [E]), tilt the fork toward the operator, and withdraw it. Feed-Driving Rockshaft The feed-driving rockshaft (figure 4-6 [L]) coordinates the feeding motion of the feed dog and the feeding of the needle. To remove the feed- driving rockshaft, proceed in the following manner (refer to figure 4-6): . Loosen the hook saddle adjusting screw (figure 4-6 [B]). . Loosen the hook saddle pinch screw (figure 4-6 [A]). . Slide the hook saddle to the right as far as possible. . Loosen the feed-driving rockshaft crank pinch screw (figure 4-6 [G]). . Loosen the setscrews on each of the feed- driving rockshaft stop collars (figure 4-6 [M]). l Lift the feed bar toward the operator until it reaches a stop position. Move the bar to the left until it strikes the bed of the machine. Lift the bar upward to clear the bed of the machine and continue moving it to the left until the right end of the shaft reaches the feed-driving crank; this action forces the right feed-driving rockshaft stop collar from the rockshaft. Continue moving the rockshaft to the left until it clears the left stop collar. Withdraw the rockshaft from the machine. Feed-Driving Rockshaft Stop Collars The feed-driving rockshaft stop collars and setscrews (figure 4-6 [M]) act as retainers on each end of the feed-driving rockshaft to prevent any side-to-side play. The feed-driving rockshaft stop collars are removed in conjunction with the feed-driving  rockshaft. 4-25