Mechanism Description; Needle Take-Up Mechanism - Brother LH4-B800E Service Manual

1. MECHANISM DESCRIPTION

1-1. Needle take-up mechanism

e
!0
!3
r
u
t
o
!2
i
y
!1
1. When the machine pulley q is turned in the direction of the arrow, the rotation is transmitted to the thread take-up
crank e that is secured to the end of the upper shaft w.
2. The needle bar crank r is secured to the thread take-up crank e, and it transmits vertical motion to the needle
bar clamp u via the needle bar crank rod t and needle bar bracket slide rod y.
At this time, the needle bar crank rod t moves together with the crank rod guide o via the needle bar bracket
slide rod i. (It moves along the slot in the needle hole of the thread take-up !0 by means of the needle bar crank
r.)
3. The needle bar !1 is secured to the needle bar clamp u, and it moves smoothly up and down while being guided
by the bushings at the top and bottom of the needle bar guide !2 and needle bar bracket !3 .
w
LH4-B800E
1. MECHANISM DESCRIPTION
Direction of
rotation
q
1 - 1