Quantcast SETTING THE NEEDLE BAR

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Use 135 x 7 needles with machines set with 1/4-inch clearance under the presser foot, and 135 x 17 needles with those set with 3/8-inch clearance (lift). Adjustments Adjustments to the 211 W 151 are basically the same as for 111 W 151. These adjustments are discussed in the following text. SETTING THE NEEDLE BAR.— Place the needle bar up into the needle bar holder as far as possible. Hold in this position and turn the balance wheel toward the operator until the needle bar is at its lowest position. When in this position, set the bar so the upper timing mark is just visible below the needle bar frame, and tighten the needle bar connecting stud pinch screw. In case the needle bar does not have timing marks, set the machine to zero stitches per inch and place the needle bar up in the holder as far as possible. Turn the balance wheel by hand until the bar is at its lowest position. After reaching the lowest position of the needle bar, continue turning the balance wheel toward the operator until it reaches 3/32 inch above its lowest point, then set the eye of the needle 1/16 inch below the point of the sewing hook. SETTING THE NEEDLE.— To set the nee- dle, insert the needle shank as far as possible into the needle bar with the long groove of the needle to the left and tighten the screw. (See figure 9-33.) 240.82 Figure 9-33.—Setting the needle. 240.83 Figure 9-34.—Needle bar rock frame rockshaft damp screw. RELATIVE POSITION OF’ NEEDLE BAR AND PRESSER BAR.— To set the relative position of the needle bar to the presser bar, loosen the needle bar rock frame rockshaft clamp screw, which is located behind the cover plate on the front upright position of the arm (fig. 9-34). Set the needle bar so the distance between the needle bar and presser bar is 17/32 inch. Retighten the clamp screw. NOTE: A handy tool for this adjustment can be manufactured locally from a thin piece of metal stock filed to exactly 17/32-inch width. This gauge should be placed between the two bars while the clamp screw is being tightened. This enables the operator to keep pressure on the loose needle bar. ADJUSTMENT HEIGHT OF SEWING HOOK.— Before attempting to adjust the height of the sewing hook, it is necessary to make a feeler gauge for testing the height. This gauge can be made of 0.032-inch shim stock, or a regular feeler gauge can be cut or trimmed down so it will fit in the small groove in the throat plate, which retains the bobbin case stop finger. If, after testing, the hook height is unsatisfactory, turn the balance wheel so the two setscrews in the bottom of the hook are accessible; loosen them with an Allen wrench. Remove the cloth washer from the bobbin case and turn the hook until the height adjusting screw is directly 9-27



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