Mechanical Descriptions; Needle Bar And Thread Take-Up Mechanisms ･･･････････････････････････････････1 - Brother HE-800A Service Manual

1. MECHANICAL DESCRIPTIONS

1-1. Needle bar and thread take-up mechanisms
1. When the machine pulley (1) is turned in the direction of the arrow, the rotation is transmitted to the thread
take-up crank (3) that is secured to the end of the upper shaft (2).
2. The needle bar crank (4) is secured to the thread take-up crank (3), and it transmits vertical motion to the
needle bar clamp (7) via the needle bar crank rod (5) and needle bar bracket slide rod (6).
At this time, the needle bar crank rod (5) moves together with the crank rod guide (9) via the needle bar bracket
slide rod (8).
3. Elliptical motion is transferred to the thread hole of the thread take-up (10) via the needle bar crank (4).
4. The needle bar (11) is secured to the needle bar clamp (7), and it moves smoothly up and down while being
guided by the bushings at the top and bottom of the needle bar guide (12) and needle bar bracket (13).
HE-800A
1. MECHANICAL DESCRIPTIONS
Rotation direction
4047Q
1