−8 −
Adjustment Procedures Results of Improper Adjustment
1. Replace the thrust washer of the hook shaft upper bushing
and adjust so that the clearance provided between inner hook
stopping section ① in the throat plate and top surface ② of
the inner hook stopper is 1 ± 0.1 mm.
(For the kind of the thrust washer, refer to “6. Selective parts
and consumable parts” on page 44.)
1. Turn the handwheel to bring inner hook guide ① to its back
end position.
2.
Turn
inner hook
② in the reverse direction of rotation of the
hook (in the direction of the arrow) and fit the
inner hook
stopper
to the
inner hook
stopping section in throat plate ③ .
3. Loosen setscrew ④ in the inner hook guide crank and adjust
so that a clearance of 0.1 to 0.3 mm is provided between the
inner hook guide and the protruding section of the inner hook.
4. After the adjustment, securely tighten the setscrew.
• Stitch skipping or thread breakage
will result.
• Needle breakage will result.
• Irregular stitches will result.
◯ When the clearance is larger than
the specified value :
• Loose stitches or thread breakage
will result.
◯ When the clearance is smaller than
the specified value :
• Inner hook or inner hook guide may
be damaged.
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