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30. Adjustment of hook-to-needle clearance
Requirement:
At the straight stitch setting the clearance between the sewing hook point and the bottom of the scarf in
the needle must be 0.05 mm (fig. 60).
At the widest zigzag stitch setting, the sewing hook point must almost touch the needle.
Check:
z Remove the needle.
z Remove presser foot and needle plate.
z Remove the bobbin case.
z Unscrew the bobbin case position finger.
z Remove sewing hook gib with bobbin case base by unscrewing the three screws.
z Insert a new system 130/705 H, size 80 needle.
z Press the straight stitch button.
z Turn the handwheel until the hook point is exactly opposite the center line of the needle.
z Check the clearance between the hook point and the bottom of the needle scarf.
z Check the axial play of hook 107 to hook shaft bushing 109.
Adjustment:
z If the hook shaft has axial play, loosen the two screws 108 (fig. 61).
z Push bevel gear 111 with the shaft to the front and sewing hook 108 to the rear.
z Tighten the two screws 108.
z Loosen screw 112 in the lifting eccentric by 2 - 3 turns.
z Loosen screw 110 slightly.
z Turn handwheel and sewing hook until the hook point is exactly opposite the center line of the needle
scarf.
z Shift the sewing hook together with hook shaft bushing 109 until the clearance between the sewing
hook point and the bottom of the scarf in the needle is 0.05 mm.
z Tighten screw 110 on the narrow flat of hook bushing.
Note:
The large flat of the hook bushing must face right.
Cross-check:
z Check for free movement of the hook shaft.
z Check the clearance between the hook point and the bottom of the needle scarf once again.
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