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General Mechanism
1. Height of needle bar bushing
™ Set dimension from top surface of throat plate to
lower end face of needle bar bushing to 64.8
±0.1mm. (bushing : driving fit)
2. Height of needle bar
™ Lower dead point of needle bar
™ Align upper engraved line A on needle bar 2 with
lower end face of needle bar bushing 3.
™ Perform adjustment with needle bar connection
setscrew.
General mechanism
1. Height of neddle bar bushing ........................... 16
2. Height of needle bar......................................... 16
3. Height of presser foot....................................... 17
4. Height of feed dog............................................17
5. Feed timing ...................................................... 17
6. Needle-to-hook timing...................................... 17
7. Clearance between needle and hook .............. 18
8. Position of bobbin case positioning finger........ 18
9. Tension of thread take-up spring ..................... 18
10. Stroke of thread take-up spring
(absorbing amount of thread)........................... 18
11. Bobbin thread tension ...................................... 19
12. Position of bobbin winder clutch ...................... 19
13. Adjustment of bobbin winder............................20
Automatic thread trimmer mechanism
1. Positioning of moving knife arm installing plate
(adjustment of position of moving knife) .......... 21
2. Installing position of thread trimmer solenoid
(moving amount of thread trimmer cam
contactor shaft) ................................................ 21
3. Thread trimmer cam timing
(needle-to-cam position) .................................. 22
4. Position and protruding amount of looper
(left/right position and adjustment of movement)
......................................................................... 23
5. Position of nut of wire setscrew
(adjustment of thread tension disk open/close)
......................................................................... 23
[6] ADJUSTMENT OF COMPONENTS
Lower end face of needle bar
bushing
Top surface of throat plate
64.8±0.1 mm
Needle bar connection
setscrew
3
3
A
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