Quantcast Setting and Timing the Needle Bar Frame

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of the hook, and the long thread groove toward the operator. Setting and Timing the Needle Bar Frame Turn the regulating spindle head all the way to the right. This will cause the machine to sew a straight stitch. The needle should be centered in the hole in the throat plate. If not, loosen the setscrew that holds the eccentric stud (1) and turn the stud until it is centered (fig. 9-40.) Turn the needle regulating spindle head (5) to the extreme left for the widest throw. Turn the balance wheel forward until the needle is at its lowest position. The needle bar should start to move in a sideward movement as the needle starts to rise. If it does not, you must advance or retard the vibrator pinion gear (2), shown in figure 9-40. Timing Sewing Hook Turn the balance wheel toward the operator’s side until the needle bar is all the way down and has risen until the lower timing mark is just visible below the needle bar frame. Loosen the setscrews (10) in the lower belt pulley (fig. 9-41) and set the hook point to the center of the needle eye. Retighten the setscrews. Setting the Hook Distance To or From Needle Loosen the two hook shaft retaining screws (8) (fig. 9-41) and the two screws in the hook pinion gear (7), and slide the hook to the correct position. Retighten the hook shaft retaining screws. Set the gear in the proper place on the shaft—gear aligned with hook drive gear-and 240.92 Figure 9-40.-X-ray view of zigzag sewing machine. 9-32



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