Lubrication Mechanism - Brother LH4-B800E Service Manual

1. MECHANISM DESCRIPTION

1-8. Lubrication mechanism

!1
o
@0
!2
!3
@3
@2
1. The plunger pump w that is attached to the lower shaft q draws oil up (A) through the pump filter e and sends
the oil (B) to the oil terminal r, where the wick lubricates the felt t.
2. The oil is transferred from the felt t by means of the wick to the following places.
1) Oil is supplied to bush F y, and it passes through the upper shaft u and thread take-up crank i to the needle
bar crank o. Furthermore, oil is supplied from bush F y to zigzag lever bush F ! 0 .
2) Oil is supplied from the needle bar bracket support shaft !1 to the needle bar !2 , and from there it is supplied
to parts such as the needle bar clamp !3 .
3) Oil is supplied from the support shaft !4 to the thread take-up !5 .
4) Oil is supplied to bush M ! 6 .
5) Oil is supplied to zigzag lever bush R !7 .
6) Oil is supplied to the motor lever shaft !8 , and from there it is supplied to the zigzag connecting rod shaft !9 .
(Oil which splatters inside the arm is collected by the felt @ 0 and is supplied to the crank rod guide @ 1 and to the
slide block @ 2 . )
3. The oil which is sent to the oil terminal r is returned to the oil tank via the oil return tube (C).
4. The oil which collects in the jaw of the arm, is absorbed by the felt @ 3 and is drawn up by the plunger pump w
through the tube (D), and it is then returned to the oil tank (E) by the plunger pump w.
1 - 8
!5
!4
r
t
y
i
(D)
!0
@1
w
(E)
(A)
!8
!6
u
!7
(C)
(D) q
(B)
LH4-B800E
!9
(B)
(A)
e