SE TTING FRONT NEEDLE GUARD (C ontinued)
NO TE : A change in stitch length WILL NOT require a change in front needle guard setting.
CHANGING STITCH LENGTH
Set the stitch to required length. This is accomplished by loosening lock nut (F, Fig. 15) 1 /2 turn (it has a left thread) on the end of the stitch regulating stud and turning the stitch adjusting screw (G) located under the left end of the cloth plate in the head of the main shaft (H) which is marked with "L" and "S". Turning the screw in a clockwise direction shortens the stitch (moves stitch regulating stud toward the "S") and turning it in a counterclockwise direction lengthens the stitch (moves stitch
regulating stud toward the "L"). Retighten the |
lock nut securely. To prevent de- |
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structive damage to the feed drive bearing, the |
key screw (J) must engage the "U" |
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shaped key slot in the ferrule (K). |
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On Styles 57700 R, Sand V, the feed rocker assembly may require lubrication |
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after years of operation at the feed rocker needle bearings (L and M, Fig. |
15). This |
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can be accomplished by loosening Allen screw (N) and remove shaft |
(P). When |
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packing needle bearings, parts must be clean and grease should be applied directly from the tube to avoid contamination. Tube of grease can be supplied under part No. 28604 P. Replace shaft inserting tapered end first and tighten screw (N ).
THREAD TENSION RELEASE
The thread tension release is set correctly when it begins to function as the presser foot is raised to within 1 / 8 inch (3.17 mm) of the end of its travel and is entirely released when the presser foot has reached its highest position.
If adjustment is needed, loosen tension release lever screw (A, Fig. 16) located at the back of the machine and move tension disc separator as required. Retighten screw. After adjustment there should be no binding at any point.
SETTING HEIGHT OF PRESSER BAR
The height of the presser bar (C, Fig. 4) is set correctly if it is possible to remove the presser foot when the foot lifter lever (B, Fig. 16) is fully depressed. Also there should be approximately 1/16 inch (1. 59 mm) clearance between lower surface of the presser bar connection and guide (D., Fig. 4) and the bottom surface of head opening in the bed when the foot lifter lever is released and the presser foot resting on the throat plate., with the feed dog down below the throat plate.
If adjustment is needed., turn handwheel in operating direction until the needle bar is in the low position. Loosen screw (E., Fig. 4) then, while holding presser foot down on the throat plate surface., pry up presser bar connection and guide with a screwdriver to obtain the 1 / 16 inch (1. 59 mm) setting and retighten screw. Check setting by turning handwheel so that needle bar is in its high position and see if presser foot can be removed as mentioned in previous paragraph.
METERING DEVICE ADJUSTMENTS
The metering device MUST operate freely with the connecting rod assembly (A., Fig. 17) positioned at any point in the clutch drive lever (B) and the clutch rocker shaft lever (C ).
NOTE: Once the metering device has been adjusted properly., the (2) threaded holes in the clutch rocker shaft lever are provided for positioning the connecting rod assembly as near VER TICAL as possible when EXTREME right or left positions in the clutch drive lever are being used.
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From the library of: Superior Sewing Machine & Supply LLC
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