Upper Thread Trimmer Mechanism - Brother HE-800B Service Manual

5. MECHANICAL DESCRIPTIONS

5-9. Upper thread trimmer mechanism

Upper thread trimmer mechanism operating sequence
Sewing starts
(machine starts)
After 1.5-2.5 mm of feed, the
upper thread scissors
gradually start to open.
After approximately 4.6mm of
feed, the upper thread
scissors are fully open.
43
The presser foot drops.
Upper thread scissors movement
Sewing ends.
HE-800B
The upper thread scissors
retract and
the presser foot lifts
Presser
foot
drops
Presser
foot
lifts
The upper thread is clamped
and cut.
The upper thread scissors
move forward.
1739B