−7 −
™ Align the engraved point on the cam with the pivot on the
bed at the position of stop motion. Then, tighten the setscrew
of cam.
After the adjustment, turn the stop motion pulley by hand
and confirm that the button clamp stops at the distance of
about 13 mm between the top of needle and the top surface
of throat plate when the needle bar descends by means of
crosswise feed.
™ If the lengthwise feed cam and
crosswise feed cam do not engage
each other, the needle moves in the
matertial used.
™ For MB-377
If the position of engraved point is
not proper, the needle entry will vary
and be not likely to drop in the same
point.
→ Thread is likely to be frayed.
If the position of engraved point is
moved to the rotating direction of
the cam, the needle is likely to move
in the material used when the
needle comes out of the material.
If the position of engraved point is
moved to the opposite direction, the
button clamp will be likely to
continue working until the needle
enters into the material.
™ Loosen the adjusting nut of the tension post No. 2, insert a
screwdriver into the tension post No. 2, and turn the tension
post No. 2 as shown in the figure below to make adjustment.
The timing of the start of floating is when the thread tension
is lost after passing the thread through the thread tension
No. 2, holding it with fingers and turning the machine by hand.
™ If the thread tension is released too
early, thread remaining and/or poor
tightness of stitches will result.
On the other hand, if the timing of
thread tension release is too late,
thread will break.
Adjustment Procedures Results of Improper Adjustment
0.8 mm
A
Rotating direction of cam
Nut
Screw driver
Timing of start of floating
is when thread tension is
lost at the time of needle
bar ascending.
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