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【 5】 ADJUSTING THE THREAD TRIMMER
5-1 Position of the movable knife and the stationary knife
■ Position of the movable knife
Set the (a 1) part of the movable knife A parallel to the
(g 1) part of the stationary holder G.
Set the distance from point of movable knife A and the
center of left screw H at approximately T (mm).
MODEL
T
NC UTA,UTE
73.5mm
NC J series UTAB
74.5mm
■Relation between the stationary knife and the movable
knife.
Adjust the engagement between blade (a 3) for trimming
looper thread and stationary knife to be U (mm) when
movable knife is at the extreme right.
So that the point of blade (a 2) for cutting needle thread
pass the corner (b 1) of stationary knife B.
The adjustment is made by loosening screw C.
MODEL
U
V
NC UTA,UTE
2.5mm
2mm
NC J series UTAB
1.5mm
3.3mm
5-2 Adjusting the looper thread clamp spring
Position of looper thread clamp spring D so that the part
(a 1) of movable knife and the part (d 1) of looper thread
clamp spring are on the same plane.
And adjust it will protrude approximately V (mm) from
the point of movable knife A when movable knife is at
the extreme right.Adjustment is made by loosening
screw C.
To adjust the pressure of thread clamp spring D, turn
adjusting screw E.
To increase the pressure, turn it
clockwise.
To
decrease
the
counterclockwise.
5-3 Adjusting the movable knife pressure spring
Position of movable knife pressure spring F so that the
part (a 1) of movable knife and the part (f 1) of movable
knife pressure spring are on the same plane.
adjust it will protrude approximately W (mm) from the
point of movable knife A when movable knife is at the
extreme right.
Adjustment is made by loosening screw E.
W
6.2mm
7.5mm
pressure,
turn
it
And
NC-UT
3
5-4 Adjusting the stationary knife holder stopper
The stationary knife holder I slides to the left and
stops by stationary knife holder stopper J.
Never slide the stationary knife holder I to the left too
much because the looper thread clamp spring touches
the looper.
screw K and moving stationary knife stopper left and
right.
stationary knife holder stopper is 1mm right from the
left end of base plate R.
5-5 Adjusting the movable knife holder left and right
With movable knife A at the extreme left end of its travel, there should be a distance of A
(mm) from the center of the needle bar to the point of movable knife.
To make the above adjustments, loosen nut T and move the pin S make a fine left-to-right
adjustment by turning nut T. The point of the movable knife is center between the point of
the looper and the eye's of the looper when move extremely left position of the knife.
5-6 Adjusting the movable knife front to back
To adjust the movable knife front to back, center the point of movable knife over the looper
with the point of movable knife 12mm moved to the left from the right end of looper. To
adjust, when loosening screw U and turning guide lever ring P clockwise, the movable knife
point moves forward and turning it counterclockwise, the point moves backward.
At the same time, movable knife holder guide N should slightly touch the end of movable
knife holder. The adjustment is made by loosening screw V.
< Note >
In case of the extremely large or small feed amount, necessary fine adjustment of the movable
knife position.（See chapter 5－8）
series
The adjustment is made by loosening
The standard position, the left end of
MODEL
A
NC
22mm
UTA,UTE
NC J
24.6mm
UTAB
4
NC-UT
series
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