Thread Take-Up Lever, Thread Take-Up Lever Crank, Needle Bar And Link Piece; Service-Manual_Artista_630_640_English_V4.01_032069_50_04.Doc - Fritz Gegauf Bernina artista 630 Service Manual

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.

Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc

63
62
71
72
68
69
60
67
66
43
64
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