−9 −
Adjustment Procedures Results of Improper Adjustment
1) Make sure that the power to the sewing machine is turned OFF.
2) Remove setscrews 1, setscrews 2 and setscrews 3. Then remove
hemming binder 4, auxiliary throat plate 5 and throat plate 6.
3) Replace the connectors.
™ Disconnect connector Z from SC-380.
™ Disconnect connector Y and connect connector Y to the detector
of SC-380 to which connector Z was connected. (Refer to the
wiring diagram of pneumatic and electrical components.)
4) Turn ON the power to the sewing machine.
5) Turn handwheel 7 by hand in the normal direction of rotation A of
the sewing machine.
(Normal direction of rotation A of the sewing machine is the
counterclockwise direction as observed from the handwheel side.)
6) When the needle bar goes up and the top end of needle comes
higher than the moving knife, depress the back part of pedal 8 in the
direction B.
(Caution) Never depress the front part of pedal 8 in the direction C.
(By depressing the back part of the pedal, the thread trimmer magnet
is turned ON and the roller enters the thread trimmer cam in the
sewing machine.)
7) Then turn handwheel 7 by hand in the normal direction of rotation of
the sewing machine.
8) Moving knife lever 9 turns counterclockwise in the direction D and
moving knife !0 starts receding in the direction E.
9) When moving knife !0 has fully receded, the position where convex
F of moving knife !0 aligns with end G of the thread draw-out plate
is the correct position of moving knife receding position.
(Caution) The power switch has been turned ON during the
operation of steps 4) through 9). Never depress the front
part of pedal 8 in the direction C.
10) If the receding amount is not proper, be sure to turn OFF the
power switch of the sewing machine, loosen moving knife lever
tightening screw !1, and tighten moving knife lever tightening
screw !1 (tightening torque : 3 to 4 N.m) so that convex F of
moving knife !0 aligns with end G of the thread draw-out plate to
adjust again the moving knife to the correct receding position.
* The work of checking and adjusting the fully receding position of the
moving knife is completed in steps 1) through 10). Be sure to return
the connector which has been replaced in step 3) to the home place,
and return the components which have been removed in steps 1)
and 2) to the home places as well. Then securely tighten the
setscrews.
* When installing the throat plate, push it in the direction of arrow mark
N and tighten setscrews 3 in the state that stopper !4 comes in
contact with the frame.
* When adjusting the receding position of the moving knife, adjust the
position in the state that the backlash is drawn in the direction of I.
™ Thread trimming failure will occur
when the receding position of
the moving knife is larger or
smaller than the correct position.
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