(. Adjusting The Top Covering Thread Trimmer Mechanism (Ut42); Adjusting The Engagement Of Knife; Adjusting The Moving Knife Stroke; Adjusting The Pressure Of Clamp Spring - JUKI MF-7200D/UT42 Instruction Manual

(. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM (UT42)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
1
3
18 mm
!2
2
9
Top covering thread
1. Adjusting the engagement of knife
4
8
5
2. Adjusting the moving knife stroke
!3
!1
!0
6 , 7
3. Adjusting the pressure of clamp spring
4. Adjusting the position of the blade
– 20 –
1) Adjust so that the engagement of fixed knife 1
wth movng knfe 2 s 0.5 mm.
2) When adjustng the engagement, loosen set-
screw 4 and adjust lever 8 .
1) Adjust so that the stroke of movng knfe s 18
mm.
2) Loosen nut 5 , adjust screw for the stopper !3 ,
and adjust the stroke of movng knfe 2 .
Perform the adjustment of the stroke of moving
knife after adjusting the engagement of the
knives.
1) Top coverng thread s held wth clamp sprng 3
after thread trmmng.
2) Holdng pressure can be adjusted by loosenng
nut 6 and turnng screw 7 .
3) Holdng pressure s ncreased when tghtenng
screw 7 and t s decreased when loosenng
screw 7 .
4) After the adjustment, tghten nut 6 .
5) Make the holdng pressure as low as possble
wthn the range of holdng the top coverng
thread.
point of moving knife
1) Brng the needle bar to ts hghest poston.
2) When lever 8 s lowered, movng knfe 2 lowers
together.
3) Adjust the movng knfe to the poston where the
hook secton of movng knfe 2 enters the con-
cave of the bottom surface of spreader 9 and
catches the top coverng thread n the state that
movng knfe 2 s fully lowered. After the adjust-
ment, tghten screws !0 !1 and !2 .
4) Screw !0 s for adjustng the lateral poston of
knfe, screw !1 for adjustng the angle of knfe,
and screw !2 for adjustng the vertcal poston of
knfe.
Make sure that the moving knife does not
interfere with other components such as
presser, needle, spreader, etc. within the
working range of moving knife 2 .