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28.
NEEDLE STOP POSITIONING (NP) (BL6800 Only)
Standard
When the sewing machine is stopped, the distance from the top of the needle (#14) to the top surface of the
needle plate must be 11.9 - 14.7 mm.
Adjustment
1.
Run the sewing machine, stop it with the SS button, then check the needle stop position (the distance from
the top of the needle (#14) to the top surface of the needle plate).
2.
Loosen the hex set screw for the rotation shutter.
3.
Adjust the rotation shutter.
4.
Tighten the hex set screw for the rotation shutter.
5.
Check the needle stop position the same as in Step 1.
Adjustment Points
3.
Turning the rotation shutter in the (A) direction raises the needle stop position; turning the rotation shutter
in the (B) direction lowers the needle stop position.
3.
Adjust the axial direction position of the rotation shutter to position it at the center of the groove in the
insulation cover (center of the photoinductor groove).
4.
Gently tighten the rotation shutter set screw with a torque of 0.3 - 0.4 Nm (3-4 kgf-cm). Tightening this
screw too strongly can crush its threads and make it impossible to secure the rotation shutter.
Needle position
sensor
Needle position shutter
Top surface of
the needle plate
11.9 mm-14.7 mm
0.5 mm
