– 18 –
7. Clearance between needle and hook
™ Loosen three setscrews in hook.
™ Align blade point of hook with center of needle.
™ Adjust clearance provided between blade point of
hook and needle to 0.05 to 0.1 mm.
™ Temporarily tighten setscrews, check the timing,
and securely tighten setscrews.
8. Position of bobbin case positioning finger
™
Loosen bobbin case positioning finger setscrew 1.
™ Align right end of convex of bobbin case positioning
finger spring with right end of needle.
™ Temporarily tighten setscrews, hold a clearance of
0.6 to 0.8 mm between inner hook and bobbin case
positioning finger, and securely tighten setscrew
2.
Bobbin case positioning finger should not come in
contact with hook.
9. Tension of thread take-up spring
™ Pass needle thread up to thread tensioner thread guide 1.
™ Lower presser foot and draw needle thread.
™ Adjust tension of thread take-up spring to 0.127 to 0.157N when thread take-up spring starts lowering.
™ For adjustment, loosen thread tensioner setscrew and turn thread tensioner 3.
™ Turning clockwise = increasing tension of thread take-up spring 4.
10. Momentum of thread take-up spring (absorbing amount of thread)
™ Pass needle thread up to thread take-up and lower
presser foot.
™ Draw needle thread from start of motion of thread
take-up spring to end of its motion.
™ Needle thread is absorbed when it is returned.
Absorbing amount : 10.5±0.5 mm
™ Perform adjustment with thread take-up spring
adjusting plate 1.
0.05 to 0.1 mm
Needle (HA x 1 #14)
Blade point
1 Bobbin case positioning
finger setscrew.
Top view
Bobbin case
positioning
finger
Needle
Front view
Needle
Bobbin case positioning
finger spring
0.6 to 0.8 mm
Align right end of
convex of bobbin case
positioning finger
spring with right end of
needle.
Setscrew
1 Thread take-up spring
adjusting plate.
10.5±0.5 mm
2 Thread tensioner
setscrew
1 Thread tensioner
thread guide
3 Thread tensioner
asm.
4 Thread take-up spring
2
Needle thread
To Next Page
Loading...
Need help?
General
