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Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
1. Clearance provided between inner hook stopping section 1 in
the throat plate and top surface 2 of inner hook stopper section
is dimension A.
(Caution)
1. It is not possible to change the height of the hook of all
models.
2. When dimension A is outside the range, Replace the
parts since there is a possibility that the parts around
the hook may be defective.
3. When there is a play in the axial direction of the hook,
replace the thrust plate which is located between the
hook shaft bushing and the hook shaft bevel gear and
adjust the play.
(For the kind of the thrust plate, refer to “6. Selective
parts and consumable parts”.
When the clearance is larger than
the specified value :
™ Loose stitches or thread
breakage will result.
When the clrarance is smaller than
the specified value :
™ Inner hook or inner hook guide
may be damaged.
™ Stitch skipping or thread
breakage will result.
™ Needle breakage will result.
™ Irregular stitches will result.
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 arrow mark A) and fit the inner hook
stopper to the inner hook stopping section in throat plate 5.
3. Loosen setscrew 4 in the inner hook guide arm, move inner
hook guide adjusting plate 3 in the direction of arrow mark B
and adjust the clearance between inner hook guide 1 and the
protruding section of inner hook 2 to 0.1 to 0.3 mm.
4. After the adjustment, securely tighten setscrew 4 in the inner
hook guide arm.
(Caution) When attaching throat plate 5 again in case of
replacing gauge or the like, re-check the clearance of inner
hook guide 1.
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