Brother International BES-916AC Instruction Manual - English - Page 136

Adjustment of Timing Between Needle and Rotary Hook

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Chapter 8 Adjustment 2. Adjustment of Timing Between Needle and Rotary Hook 2mm r 0.2-0.4mm y q 2mm w t e 1. Select needle bar No. 1. The above figure shows model BES-916AC. For model BES-1216AC, needle bar No. 12 corresponds to y. 2. Remove two flat countersunk head screws w, and remove needle plate e. 3. Make an adjustment so that the needle is brought to rotary hook r when it rises 2 mm from the needle bar bottom point (180°) (in the position where the mark " " of the pulley is aligned with the stop mark " "). 4. Loosen screws t of the rotary hook. Adjust the clearance between the needle and the rotary hook to 0.2 to 0.4 mm. Tighten the two screws temporarily. The needle bar height will be about 2 mm (Figure A). 5. Select the second needle bar (bar No. 12 for BES-1216AC) y. Check that a clearance of 0.2 to 0.4 mm is left between the needle and the rotary hook. Tighten the three screws of the rotary hook. Note) If the clearance between the needle and the rotary hook is not within 0.2 to 0.4 mm, repeat step 3 and adjust both clearances at needle bar No. 1 and No. 9 (No. 12 for BES-1216AC) to the range of 0.2 to 0.4 mm respectively. 134 BES-916AC • BES-1216AC

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Chapter 8
Adjustment
BES-916AC • BES-1216AC
134
1.
Select needle bar No. 1.
The above figure shows model BES-916AC.
For model BES-1216AC, needle bar No. 12 corresponds to
y
.
2.
Remove two flat countersunk head screws
w
, and remove needle plate
e
.
3.
Make an adjustment so that the needle is brought to rotary hook
r
when it rises 2 mm from
the needle bar bottom point (180
°
) (in the position where the mark "
" of the pulley is aligned
with the stop mark "
").
4.
Loosen screws
t
of the rotary hook.
Adjust the clearance between the needle and the rotary
hook to 0.2 to 0.4 mm.
Tighten the two screws temporarily.
The needle bar height will be
about 2 mm (Figure A).
5.
Select the second needle bar (bar No. 12 for BES-1216AC)
y
.
Check that a clearance of 0.2
to 0.4 mm is left between the needle and the rotary hook.
Tighten the three screws of the
rotary hook.
Note)
If the clearance between the needle and the rotary hook is not within 0.2 to 0.4 mm, repeat step 3 and
adjust both clearances at needle bar No. 1 and No. 9 (No. 12 for BES-1216AC) to the range of 0.2 to 0.4 mm
respectively.
2.
Adjustment of Timing Between Needle and Rotary Hook
y
q
w
e
r
t
2mm
2mm
0.2-0.4mm