Brother LH4-B800E, Service Manual

Page: 59 / 168

LH4-B800E
3 - 4
3. ASSEMBLY
Install the two feed shaft linear bushes
q
to the bed. Secure the ball bearing stopper
w
with the screw
e
. Place the linear bush
r
onto the feed
arm support
t
and install it with the two retaining rings
y
.
Pass the feed arm support
t
through feed guide shaft A
u
and install it to the bed. Provisionally tighten the two bolts
i
. Place feed guide shaft
B
o
through the feed arm support
t
, align the reference lines
!0
, and then secure by tightening the set screw
!1
. Securely tighten the two bolts
i
so that the feed arm support
t
moves smoothly.
Install the two ball bearings (688ZZNR)
!2
to the bed.
Place the timing belt
!3
onto the pulley B assembly
!4
, and then insert the support shaft
!5
. Install the pulley B assembly
!4
to the support shaft
!5
and secure by tightening the set screw
!6
.
Install the motor mounting bracket
!7
to the feed pulse motor
!9
with the four bolts
!8
.
Install the pulley A assembly
@0
so that there is a gap of 0.5 mm between it and the motor, and secure it by tightening the two set screws
@1
.
Place the timing belt
!3
onto the feed pulse motor
!9
, and then provisionally tighten it with the three screws
@2
and the three washers
@3
. Push the
motor mounting bracket
!7
in the direction of the arrow with a force of 100 N, and then securely tighten the screws
@2
. Gently tighten the eye bolt
@4
. If there is no tension gauge available, apply a force of 5 N at the middle of the timing belt
!3
span and adjust so that the amount of deflection
at this time is 3.5 mm.
Place the belt holder
@5
onto the timing belt
!3
, and then install it to the feed arm support
t
with the two bolts
@6
.
Install the DC fan motor 40 assembly
@7
to the feed motor cover
@9
with the two screws
@8
. Install the feed motor cover
@9
to the bed with the
screw
#0
.
Install the feed home position sensor
#1
to the feed sensor support plate
#2
with the screw
#3
. Install the feed sensor support plate
#2
to the bed
with the screw
#4
and the plain washer
#5
.
Pass the cords for the feed pulse motor
!9
, DC fan motor 40 assembly
@7
and feed home position sensor
#1
through the cord holder
#6
and the
cord supports
#7
as shown in the illustration, and secure to the bed with the screw
#8
and the plain washer
#9
.
3-3. Feed mechanism
e
q
w
t
r
y
!0
o
i
u
!1
!2
!5
!4
!3
!6
Align the pulley
support shaft
w i t h t h e
w o r k e d s u r -
face of the bed
!0
0.5 mm
100 N
@0
!9
!8
!7
@3
@2
@4
@5
@6
@7
@9
@8
#2
#9
#1
#7
#5
#6
#9
#7
t
@1
!3
!3
t
#0
#4
#3
!9
@7
#1
#8
#8