Brother LK3-B430E MARK II - 3 Mechanical Descriptions; Needle Bar, Thread Take-Up, Lower Shaft and Shuttle Race Mechanisms

LK3-B430E Mark II
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3. MECHANICAL DESCRIPTIONS
e
r
t
y
u
w
!0
!1
!2
!3
q
i
o
3. MECHANICAL DESCRIPTIONS
3-1. Needle bar, thread take-up, lower shaft and shuttle race mechanisms
1. When the pulley q rotates in the direction of the arrow, the motion is transmitted to the thread take-up
crank e through the upper shaft w.
2. The needle bar crank r attached to the crank e moves the thread take-up lever t.
3. The needle bar crank y moves the needle bar u up and down via the thread take-up lever t.
4. When the pulley q rotates in the direction of the arrow, the eccentric portion of the upper shaft w causes
the crank rod i to move up and down.
5. The crank rod i moves the rock gear o back and forth.
6. The motion of the rock gear o causes the lower shaft gear !0 to oscillate. Resultantly, the driver !2 and the
shuttle hook !3 in the shuttle hook mechanism oscillate.