HE-8000
10.STANDARD ADJUSTMENTS
75
10-7-2. Adjusting the upper thread scissors opening timing
After the sewing machine has returned to the home position, press the RESET key before carrying out this
adjustment.
<Gradual opening timing adjustment>
1. Loosen the screws (1), and then adjust so that the distance (b) between ridge line (B) on the opening
cam (2) and the upper thread scissors (3) is 0.5 mm, and so that ridge line (B) on the opening cam is
parallel to the feed direction.
2. Loosen the screw (4), and then adjust so that the distance (c) between the rising section (C) of the upper
thread scissors (3) and the tip of the opening cam (2) is approximately 0.5 mm when the upper thread
scissors (3) are closed.
If you would like the scissors to start opening earlier, make the distance smaller. However, if the distance
is too small, check that the work clamp does not touch the rising section (C) of the upper thread scissors
(3) of the opening cam (2) when it is lowered and prevent the upper scissors (3) from opening.
* Apply grease to the inclined face (D) of the opening cam (2).
<Scissors fully opening timing adjustment>
1. Loosen the screw (5), and then adjust the support plate (8) so that the back plate (6) and the cam (7)
overlap by approximately 1.0 – 1.5 mm.
* If the amount of overlap is too small, the upper thread scissors will not open properly and the upper
thread scissors and the cutter may touch each other.
2. Loosen the screw (9), and then adjust the clearance between the bend in the back plate (6) and the cam
(7) to approximately 2 mm. If you would like the scissors to start opening earlier, make this clearance smaller.
3. Check that the upper thread scissors (3) open smoothly during feeding.
NOTE:
If the upper thread scissors (3) do not open smoothly, the upper thread scissors (3) may touch the cutter
and needle breakage may occur.
(1)
(2)
(3)
(B)
(D)
0.5 mm
(c)
(C)
Start touching at 1.5 – 2.5 mm
(b)
0.5 mm
0.5 mm
(b)
(B)
(4)
(1)
(2)
(4)
0.5 mm
(c)
(C)
Approx. 2 mm
(5)
(8)
(9) (7)
(6)
Approx.
1.0 – 1.5 mm
2180Q
2181Q
2183Q
2182Q
