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FIG. 32
FIG. 33
FIG. 34
FIG. 35
NEEDLE THREAD ADJUSTMENTS
Five needle thread strike-off pins (A, Fig. 32) are provided for independent
needle thread control. Level the take-ups to the height of the thread in the
needle lever eyelet at its lowest position. Raise the first take-up (nearest
the operator) 1/8" (3.2mm), the second take-up 3/32" (2.4mm) and the
third 1/16" (1.6mm). Further adjustment may be necessary to obtain
proper needle loop size so skipped stitches may be avoided.
Set the five frame needle thread eyelets (B, Fig. 32) eye with the eyelets in
holder (C). Adjust as necessary so the needle thread loops around the
looper will remain firm and not seek random positions when the needle
bar descends.
Unlocking spring (A, Fig. 33) provides a proportional amount of pull-up of
the needle threads when the machine is reversed for unlocking the stitch
so the loops will not form on the front of the needles and become caught
by the looper. (Needle threads must be under spring wire when unlocking
stitch.)
NOTE: Unlocking spring is only used when starting and stopping
on the material.
Turn screw (B) up or down so unlocking spring (A) will have 1/8"
(3.2mm) drop from the bottom of the thread holes to the top of screw
(B). Loosen screw (C) and turn knurled knob (D) to adjust the spring
tension. Tighten screw (C).
Tension of the seven threads is individually controlled. The needle
tension is seldom uniform; the first needle thread having more
tension than the other four. Use only enough tension to pull up the
stitch. A well-balanced stitch will have the first and fifth needle loops
pulled up and the second and third needle loops small and even.
LOOPER THREAD ADJUSTMENT
Loosen screws (A, Fig. 34) and position looper thread cast-off (B) flush with
the right end of cast-off support plate (C). Tighten screws (A). Loosen screws
(D, Fig. 34 inset) and time take-up (E) so the thread will cast-off when the
needle bar has descended 7/64" (2.8mm) from its highest position. When
thread eyelets (F) are moved further to the left the amount of thread pull-off
will increase.
COVER THREAD ADJUSTMENT
Loosen screw (A, Fig. 35) and set the lower edge of cover thread take-up
eyelet (B) so its 3/32" (2.4mm) above the surface of cast-off plate (C). Tighten
screw (A). As the cover thread hook moves to the left over the cover thread
and the needle bar starts to rise, the cover thread must "cast-off" from the
high point of take-up (D). Loosen screws (E) and adjust take-up (F) accord-
ingly. make sure that take-up (F) is centered in cast-off plate slot (C) and
take-up eyelet (B) is centered to take-up (F). Tighten screws (E).
18
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