Brother International BES-941BC Instruction Manual - English - Page 153

Loosen the screw, and the top dead center stopper bolt

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Chapter 8 Standard Adjustment 1. Turn the pulley B q until the scale of pulley B q indicates 180˚ (where the pulley B indication mark " " and the stop mark " " are aligned) and the needle bar is set at the lowest position. 2. Insert the positioning bar w into the hole of the pulley B q and fix the drive shaft. Note) Turn the pulley B securely in the clockwise direction. 3. Insert the bottom dead center gauge e into the rotary hook r. 4. Loosen the screw y of the needle bar clamp t and the top dead center stopper bolt o, then move the needle bar up and down until the needle tip touches the gauge e lightly. Note) • The needle point should touch the gauge at a place other than the cutting section. • The bottom dead center gauge should be set in or removed from the rotary hook with its cutting section facing upward. 5. Tighten the screw y of the needle bar clamp t securely. 6. After adjustment is finished, remove the positioning bar w. 7. Set the needle bar at the highest position (where the pulley B indication mark " " and the cover indication mark " " are aligned). Lightly press the top dead center stopper u toward the cushion rubber i, and tighten the top dead center stopper bolt o while pressing down the needle bar clamp so that it faces the front. Note) • Make sure that the top dead center stopper u does not hit the needle bar guide rail !0 at this time. • When tightening the upper dead point stopper bolt o, insert the longer side of the attached wrench into the bolt and tighten it by using the shorter side. Excessive tightening may make the needle bar movement sluggish. BES-941BC • BES-1241BC 151

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Chapter 8
Standard Adjustment
BES-941BC • BES-1241BC
151
1.
Turn the pulley B
q
until the scale of pulley B
q
indicates 180˚ (where the pulley B indication
mark "
" and the stop mark "
" are aligned) and the needle bar is set at the lowest position.
2.
Insert the positioning bar
w
into the hole of the pulley B
q
and fix the drive shaft.
Note)
Turn the pulley B securely in the clockwise direction.
3.
Insert the bottom dead center gauge
e
into the rotary hook
r
.
4.
Loosen the screw
y
of the needle bar clamp
t
and the top dead center stopper bolt
o
, then
move the needle bar up and down until the needle tip touches the gauge
e
lightly.
Note)
•
The needle point should touch the gauge at a place other than the cutting section.
•
The bottom dead center gauge should be set in or removed from the rotary hook with its cutting section
facing upward.
5.
Tighten the screw
y
of the needle bar clamp
t
securely.
6.
After adjustment is finished, remove the positioning bar
w
.
7.
Set the needle bar at the highest position (where the pulley B indication mark "
" and the
cover indication mark "
" are aligned).
Lightly press the top dead center stopper
u
toward
the cushion rubber
i
, and tighten the top dead center stopper bolt
o
while pressing down
the needle bar clamp so that it faces the front.
Note)
•
Make sure that the top dead center stopper
u
does not hit the needle bar guide rail
!
0
at this time.
•
When tightening the upper dead point stopper bolt
o
, insert the longer side of the attached wrench into
the bolt and tighten it by using the shorter side.
Excessive tightening may make the needle bar movement sluggish.