Upper Thread Mis-Trimming; Needle Strikes Upper Thread Trimmer - Brother HE-800A Instruction Manual

１６-１５. Upper thread mis-trimming
Cause
Upper thread trimmer
assembly
Trimmer driving arm
１６-１６. Needle strikes upper thread trimmer
Cause
Upper thread trimmer
assembly
Check
Installation position of
upper thread trimmer
assembly
Upper thread trimmer
assembly holding force
Upper thread trimmer
cutting depth
Check
Installation position of
upper thread trimmer
assembly
upper thread trimmer
operating force
Remedy
Adjust the installation position of upper thread
trimmer assembly by moving the setting plate
assembly.
Upper thread trimmer longitudinal position
adjustment
Upper thread trimmer cutting depth adjustment
Adjust so that the thread does not come out when
you cut it with scissors and hold the end of the
thread between your fingers and gently swing the
assembly.
Bend the scissors U or replace them so that the
correct force is applied.
Repair any damage from striking the needle.
Cotton yarn #60
Holding force approx. 2N
Adjust the position of the trimmer driving arm roller.
Remedy
Adjust the installation position of upper thread
trimmer assembly by moving the setting plate
assembly.
Upper thread trimmer longitudinal position
adjustment
Upper thread trimmer cutting depth adjustment
Remove any scratches and burrs, and adjust the
upper thread trimmer M to open when the projection
is pressed with a force of 4N or less.
HE-800A
16. TROUBLESHOOTING
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Service
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