STANDARD ADJUSTMENTS [1] {Machine Head)
<Fitting
a
needle>
BAS-610
BAS-611
BAS-612
• Loosen screw 0 and Insert needle 8 all the
way in, with the long groove
to
the Inside.
0
Long groove
<Adjusting the upper and lower shaft
timing>
Red
dot
1.
Remove the needle.
2.
Tilt the machine head and remove timing belt 0 .
3.
Align mark A
on
the pulley with the red dot.
4. Without moving the upper shaft, align the arrow mark on timing belt wheel assembly 8 with the arm
bed reference line and re- mount timing belt
0 .
5.
Right the machine head and fit the needle.
<Adjusting the needle and rotary hook
timing>
[Clearance between the needle and rotary hook point]
Needle
Rotary hook point
~ax.
0.05mm
1. Loosen screws A , B , C and D and move the rotary hook base 0 sideways
to
Its approximate
position (within 1
to
3 mm).
2.
Tighten screw D and then adjust the clearance between the needle and the rotary hook point
to
0.05 mm
by
turning adjustment screws 8 .
3.
Fully tighten screws A , B and C after the adjustment.
Note:
• Secure lower shaft gear 8 by tightening setscrew C so that the gear lightly touch guide plate 8 .
Tighten setscrews C on lower shaft gears 8 so as not
to
change the screw stop.
-35-
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