Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc
43
64
61
62
65
69
68
63
60
71
72
4.25 Thread take-up lever, thread take-up lever crank, needle bar and link
piece
Disassembly:
1. Remove
covers.
2. Remove CFL light (
p. 28
).
3. Remove upper thread tension unit (
p.40-41
).
4. Loosen securing screw (
61
) and remove
angular adjusting piece (
60
).
5. De-hook zigzag segment tension spring
(
62
).
6. Pull needle bar support (
63
) forward at the
bottom to pull thread take-up crank (
64
) out
from the crank guide piece (
65
) on the left.
(Don’t lose the needle bar support cam!)
7. Loosen screws (
68
) and (
69
) and pull needle
bar down out of the needle bar support.
8. With artista 640, loosen screw (
68
),
disengage needle bar and pull down out of
the needle bar support.
9. Loosen balance piece (
67
) screw (
66
). Pull
crank out from the balance piece from the
left (Don’t lose the washer!)
10. Pull thread take-up lever out from link piece
out from the right.
11. The link piece can be replaced by loosening
the screw and sliding it off the shaft.
12. Replace thread take-up lever, link piece, needle bar and/or crank.
Assembly:
1. Refit link piece.
2. Put thread take-up into link piece.
3. Put crank into thread take-up and washer into balance piece.
4. Put thread take-up crank into crank guide piece (
65
).
5. Slide needle bar back into needle bar support. Tighten
screws (
68
) and (
69
) provisionally.
6. With artista 640, slide needle bar into needle bar support,
and engage basting clutch into needle bar. Tighten screw
(
68
) slightly.
7. Insert needle bar support cam, push needle bar support
back in, insert zigzag segment in gear center. Re-hook
tension spring and set the thread take-up unit with the
angular adjusting piece free of play.
8. Refit upper thread tension unit.
9. With artista 640, set basting magnet (
p. 62
).
10. Refit CFL light, making sure that the cables are placed
correctly.
11. Refit covers.
12. Set needle position.
13. Set needle height (
p. 55
) and threader position. Tighten screws (
66
) and (
67
).
14. Calibrate speed. (SP test 4f,
p. 84
).
15. Carry out a functional check.
16. Sew-off.
66
67
