Position of needle and hook
Service Instructions 171/173 - 00.0 - 01/2020 21
Example using a 934 SIN/Nm 110 needle
Fig. 8: Adjusting the needle evasive movement (ellipsis width) (3)
To adjust the needle evasive movement:
1. Insert the needle.
2. Screw in the clamping sleeve (2).
3. Insert the dial gage (1).
Values for addition
Needle strength a
0.7 mm
Hook thickness b
1.4 mm
Distance between hook tip and
needle
0.1 mm
For greater needle strength
110 Nm X*
0.1 mm
Result
Ellipsis width E
2.3 mm
*X = larger measurement a for greater needle strength:
X for Nm 100 = 0 mm
X for Nm 110 and 120 = 0.1 mm
X for Nm 130 = 0.2 mm
(1) - Dial gage
(2) - Clamping sleeve
(3) - Needle guard
(4) - Screws
(5) - Screw
(6) - Hook carrier
(7) - Hook shaft
(8) - Gear wheel
(9) - Eccentric
(10) - Set collar
(11) - Lower shaft
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