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Adjustment Procedures Results of Improper Adjustment
™ Too small overlapping amount of
catching part in pointed end of
movable knife with the stationary
knife disables cutting of looper
thread.
™ Too much distance from the
pointed end of movable knife to
the top end of clamp spring
disables clamping.
™ Too small distance from the
stationary knife to the top end of
flat spring could cause improper
clamping; too much distance
could disturb smooth thread
threading.
For the adjustment of stationary knife 9 and clamp spring !1 ,
loosen 2 screws 7 and a screw 8 .
Be sure to retain the screw 8 which adjusts the clamping pressure
after thread trimming and make adjustment of clamping pressure
so that looper thread comes off about 3 stitches after start of
sewing.
Mount the clamp spring !1 and stationary knife 9 so that they
are parallel to the side of movable knife !0.
When looper moves forward all the way to its limit, push on the
solenoid so that the pointed end of stationary knife is situated
12.5 mm ahead from the rear of looper. In this state :
™ Loosen the screw !9 so that the pointed end of stationary knife
comes to the ridgeline in the flat section of looper top face(Refer
to the left illustration), and make adjustment by turning the
eccentric @0 .
™ Adjust stopper plate !5 by loosening 2 screws !4, adjust stopper
plate so as clamp spring just clears rear of looper.
™ Loosen the 2 screws !8 , and move up and down the guide !6
so that the guide !6 is in contact with the underside of movable
knife !7 and the clearance between the movable knife !0 and
the upper face of lower looper !3 is to be 0.1mm.
™ Incorrect adjustment could
cause the failure of thread
cutting and the thread cast-off at
the start of sewing.
!1
7
78
9
!0
!9
@0
@1
!3
!7
!6
!8
!4 !5
!0
From the library of: Diamond Needle Corp
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