Table of Contents
Advertisement
FIG. 30
FIG. 32
FIG. 33
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 six threads is individually controlled. The needle tension is seldom uniform; the first needle
thread having more tension than the other three. Use only enough tension to pull up the stitch. A well-
balanced stitch will have the first and fourth needle loops pulled up and the second and third needle loops
small and even.
SETTING THE TRIMMING KNIVES
(ALL STYLES) (CONT.)
FIG. 31
NOTE:
More or less spring pressure may be required depend-
ing on the type of material being sewn. Also, both
knives may have to be repositioned after a trial seam
is made so there is an equal margin from the edges of
the two plies to the center rows of stitching.
NEEDLE THREAD ADJUSTMENTS
Four needle thread strike-off pins (A, Fig. 32) are provided for inde-
pendent 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) and the second
take-up 1/16" (1.6mm). Further adjustment may be necessary to
obtain proper needle loop size so skipped stitches may be avoided.
Set the four frame needle thread eyelets (B, Fig. 32)
eye with the eyelets in holder (C). Adjust as neces-
sary 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 propor tional
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.
NOTE: Unlocking spring is only used when starting
and stopping on the material.
19
If necessary loosen screw (A,
Fig. 30) and move knife (B) to
the right or left as required.
Tighten screw (A).
If the shear angle between
the knives has to be changed,
raise or lower screw (C, Fig.
30) in knife holder shank (D).
To set spring pressure be-
t w e e n t h e k n i v e s l o o s e n
screw (A, Fig. 31) and raise
knife holder guide collar (B)
1/16" (1.6mm) from knife driv-
ing bracket (C).
Tighten
screw (A).
Advertisement
Table of Contents
