Adjusting The Inner Rotary Hook And Rotary Hook Holder Overlap; Adjusting The Work Clamp Pressure; Adjusting The Knife Installation - Brother LH4-B800E Instruction Manual

10-4. Adjusting the inner rotary hook and rotary hook holder overlap

(1)
(3)

10-5. Adjusting the work clamp pressure

(2)
(1)

10-6. Adjusting the knife installation

(2)
(1)
(3)
1.5 – 2.0 mm
2174Q
(4)
0.3 mm
A
(2)
A
2172Q
2173Q
Lowest
position
Top of needle plate
Lowest
position
Top of needle
plate
(5)
Loosen the screw (3) to adjust so that the tip of the
rotary hook holder (1) does not protrude past the
edge A of the inner rotary hook (2).
2171Q
1. The standard distance A is 30 mm (approximately
30 N).
2. Loosen the nut (1) and turn the presser adjusting
screw (2) to adjust the work clamp pressure.
1. Install the knife with the screw (2) so that the top
(1) of the knife blade is aligned with the top of the
needle plate when the knife is pressed down by
hand to its lowest position.
For the flat cutter (3), install with the screw (2) so
that the top (1) of the knife blade is 1.5 – 2.0 mm
above the top of the needle plate.
NOTE:
When the knife is driven by the solenoid, the
movement will be approximately 2 mm greater
than that shown in the illustration.
NOTE:
If the knife does not cut properly, the knife may get
stuck in the material and not return. If this happens,
replace or sharpen the knife.
A special needle plate which helps to prevent the
knife from getting stuck and which helps maintain
the cutting edge is available as an option.
2. Loosen the screw (5) to adjust so that the
clearance between the cutter and the needle bar
(4) is 0.3 mm.
* Check that the needle bar (4) does not touch
the cutter when it moves sideways.
2175Q
HE-8000
10.STANDARD ADJUSTMENTS
73