ELNA 745 -, Руководство по обслуживанию

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CLEARANCE AND TIMING OF UPPER LOOPER TO LOWER LOOPER 10
e
2.5mm 2mm
b
c
d
a
f
0.05~0.2mm
1.0~1.5mm
A
B
1. Remove: Mains lead - Sewing foot.
2. Check adjustments:
- Height and orientation of needle bar (see page 5).
- Height - clearance - angular position of lower looper (see page 6 ).
- Timing of lower looper (see page 8a & 8b).
- Angular position of upper looper (see page 9).
3. Remove machine base.
4. Make sure that there is no axial play, neither on the lower looper shaft "a" , the upper
looper shaft "b" , nor on the 2 pivoting axles "c" and "d" .
5. Clearance: Loosen screw "e" slightly and adjust upper looper to lower looper to obtain a
clearance of
0.05 to 0.2mm
between them when they pass each other; see detailed drawing
"A" .
6. Tighten screw "e" securely and recheck clearance.
7. Timing: Adjust timing of upper looper so that its point passes 1.0 to 1.5mm below the
hump of lower looper; see detailed drawing "B" . If necessary, loosen both screws of upper
looper eccentric "f" (Eccentric "4" in page 3), then, by means of one screw, hold eccentric
"f" and turn slightly handwheel, either forward to advance or backward to retard, upper
looper in relation to lower looper.
8. Tighten both screws of eccentric "f" .
9. Refit machine base.