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Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
™ Adjust the vertical position of needle bar cam plate 4 and
longitudinal position of needle bar fork thread take-up 6 so
that the hole for the right needle of needle bar fork thread take-
up 6 is as shown in the figure on the left-hand side when the
needle bar is at its lower dead point. At this time, assemble so
that the clearance in the lateral direction between needle bar
fork thread take-up 6 and needle bar cam plate 4 should be
equal.
(Caution) See the item (1) Parts used.
<When excessively hard-to-slip
thread is used>
Needle bar cam plate
... Set it higher by 1 to 1.5 mm.
Needle bar fork thread take-up
... Adjust it to the front side.
<When easy-to-slip thread is used>
Needle bar cam plate
... Keep as it is.
Needle bar fork thread take-up
... Adjust it to the rear side.
Horizontal direction : 53 mm from
the right-hand side of “needle bar
cam plate 4”
Height direction : (From the top end
of needle thread eyelet installing
base to the bottom end of the hold
of the thread guide)
<When desired to decrease the
tension with light-weight materials>
Increase the whole adjustment
values by 1 to 2 mm.
<When thread breakage occurs
frequently with heavy-weight
materials>
Decrease the whole adjustment
values by 1 to 2 mm.
™ Remove needle thread eyelet installing base !0 with the thread
guide !1 from silicone thread lubricator (asm.) 9.
™ Temporarily set needle thread eyelet installing base !0 to
medium thread path base 7.
™ Tighten medium thread path base 7 by using the setscrew
located at the upper side of the auxiliary thread take-up cover.
™ Adjustment value of needle thread eyelet !1 is as described
below.
(Caution) See the item (1) Parts used.
MFC MF
A (left) 15 mm 22 mm
B (center) 19 mm 25 mm
C (right) 21 mm 29 mm
From the library of: Diamond Needle Corp
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