Position of needle and hook
22 Service Instructions 171/173 - 00.0 - 01/2020
4. Turn the handwheel and set the hook shaft (7) to the lowest point.
5. Set the value 0 on the dial gage (1).
6. Turn the handwheel and set the hook shaft (7) to the highest point.
7. Read the difference off the dial gage (1).
8. If the measurement does not match the calculated measurement,
loosen the lower shaft (11) and shift its position.
Information
An adjustment in the axial direction changes the ellipsis width at a ratio
of 1:2.
(Example: When the lower shaft (11) is moved by 0.2 mm, the ellipsis
width changes by 0.1 mm.)
9. Disassemble throat plate and feed dog.
10. Swivel down the needle guard (3).
11. Loosen eccentric (9), set collar (10) and gear wheel (8).
12. Shift the lower shaft (11) in axial direction.
• Ellipsis width decreases: Slide the lower shaft (11) to the right
• Ellipsis width increases: Slide the lower shaft (11) to the left
13. Tighten eccentric (9) and set collar (10) such that they are pushed up
against the lower shaft (11).
14. Align and tighten the gear wheel (8).
15. Loosen the screw (5).
16. Loosen one of the screws (4).
17. Move the hook carrier (6) such that the distance of the hook tip from
the needle is 0.1 mm.
18. Tighten screws (4) and (5).
19. Check the movement of the toothed belt.
20. If necessary, align the lower toothed belt wheel.
To Next Page
Loading...
