Pfaff Creative 7550, Руководство по обслуживанию, Страница: 31 / 116

12. Hook timing
Requirement:
When the needle bar has moved 2 .. 3 mm upwards from its lowest position (with the machine set for
straigth stitch and center needle position), the sewing hook point must be exactly opposite the center
line of the needle (fig. 12a).
Check:
•
Unscrew baseplate and thread monitor, but leave all electrical connections in place .
e Remove sewing foot and needle plate.
e
Select stitch pattern "00" for straight stitch.
•
Bring the needle bar to its lowest position by turning the handwheel.
e Set the spacer (63-102 600-18) on top of the needle bar and push it upwards against the needle
bar frame .
•
Push the needle-rise clamp (00-870 137-01) on the needle bar and tighten it lightly.
e
Push the 2.3 mm feeler gauge (00-870 136-01) with its cutout on the needle bar above the
needle-rise clamp.
e Loosen the needle-rise clamp and push the 2.3 mm feeler gauge upwards a� mst the spacer.
e
Tighten the milled screw on the needle-rise clamp.
•
Turn the handwheel backwards and forwards a little.
e If there is any play on the feeler gauge, repeat this procedure.
•
Remove the 2.3 mm feeler gauge.
e Turn the handwheel in sewing direction until the needle rise clam !
(fig. 12a).
By this means the needle has moved upwards to the needle risr "'
The hook point must now be exactly behind the center line of
the
ne ..
Adjustment:
e If the setting is not correct, remove the needle-rise clamp.
•
Loosen the two screws 49 (fig. 12b).
•
Re-fit the needle-rise clamp and repeat the operation as des c :
.
�,., n ._
.
.otn
the spacer
'11.
. o eo::<Jie
bar has moved 2.3 mm upwards and the needle-rise clamp
i
s
u ...
nwct with the :
•
Turn the hook until the hook point is exactly behind the center
1
1e
of
thP • ·�.
e Press sewing hook 50 and bevel gear 46 together
so
that there •s no
r
and tighten one screw 49.
Check:
e Turn the handwheel a little backwards and then forwards until th e , , jl e- ·
contact
with
the spacer (fig. 12a�.
The hook point must be exactly behind the center line of the needle.
e
Remove the needle-rise clamp .
e
Verify that the hook shaft has no axial play.
e
Tighten the two screws 49 very firmly.
30
" 1 L