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Adjustment Procedures Results of Improper Adjustment
™ Loosen screws 3 to such an extent that bracket 1 in terms of
support 2 moves.
™ Align engraved marker dot on the frame with that on the hand
pulley when needle is at its upper dead point, and perform all
adjustments.
™ Install the thread trimmer device on the sewing machine with
screws 4, adjust so that the top end of lower knife comes at
the position of 3 mm from the right-hand side of the base of
looper.
As shown in the figure on the left-hand side, securely tighten
screws 4 so that the top end of lower knife comes flush at the
center of the upper section of the looper.
(Caution) When the position of the air cylinder is not set right,
make sure that the top surface of bracket 1 is flush
with that of 5, and fix the cylinder with screw 6.
By so doing, the upper knife can be kept flush at
the time of thread trimming.
™ Loosen screw 7, and adjust upper knife 8 to the position of
7.5 mm from the right edge of feed dog. At this time, make
sure with screw 7 that the vertical pressure is not applied to
the lower knife, and adjust by eye observation so that both
upper and lower knives are flush with each other.
™ Adjust so that upper knife 8 overlaps with the lower knife by
0.5 mm at the waiting position. At this time, determine the
position with screw 9 and fix with nut !0.
™ Temporarily tighten screws !1, stretch the lower knife over the
looper, and set the height of the knife to 0.05 mm to 0.1 mm at
the upper section of the looper. Adjust the clearance between
the knife and looper with screw !2 and securely tighten screws
!1.
™ Adjust so that the blade section for needle thread comes to
the position of 1.2 mm from the left needle when the lower
knife is operating. To adjust, loosen screw !3 once, determine
the positions of stopper !4 and washer !5, and tighten screw
!3.
From the library of: Diamond Needle Corp
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