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Brother LH4-B800E Service Manual Page 16

Electronic lockstitch button holer.
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1-8-1. Lower shaft and rotary hook lubrication
u
1. The oil which is drawn up by the wick q is supplied to the lower shaft w.
2. The oil which is drawn up by the wick e passes through the felt r and the rotary hook joint t to the felt y, where
it is supplied to the rotary hook u.
3. The oil that is supplied to the rotary hook u can be adjusted by turning the screw i to vary the amount by which
the rubber presser o presses down on the collar !0 that the wick passes through.
y
r
!0
t
q
o
i
LH4-B800E
1. MECHANISM DESCRIPTION
w
e
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