−41 −
(2) With regard to sewing
Cause (1)Troubles
Cause (2)
Corrective measures
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1. Stitch skipping 1-1) Needle components
1-2) Hook components
1-3) Defective feed
1-4) Thread tension components
1)-A Needle is bent.
1)-B Installation of needle is
wrong. (Orientation or
insufficient insertion)
1)-C Blunt of needle tip
1)-D Needle is too thin for
thread used or cloth.
1)-E Kind of needle is
improper.
2)-A Blunt or worn-out of
blade point of hook
2)-B Defective hook timing
2)-C Height of needle bar is
improper.
2)-D Clearance at blade point
of hook is improper.
2)-E No needle guard
3)-A Stitch skipping due to
stitch gathering
4)-A Needle thread tension is
too high. (excessively
tightened)
4)-B Tension of thread take-
up spring is too high.
4)-C Stroke of thread take-up
spring is too large
4)-D Stroke of thread take-up
lever is small.
4)-E Tension of thread tension
No. 1 is too low.
Replace the needle.
Install the needle again.
Replace the needle.
Replace the needle with a proper needle
(thick needle if possible).
Replace the needle with a proper one.
SCHMETZ UY180GVS is recommended.
Correct the blade point of hook or replace
the hook.
Adjust the timing according to 4-(2).
Perform the adjustment described in the
Instruction Manual as the aim and in
accordance with the conditions of cloth and
thread, perform fine adjustment according
to 4-(21).
Adjust the height of needle bar according
to 4-(1).
Making as the base the adjustment
procedure described in the Instruction
Manual, in accordance with the conditions
of cloth and thread, perform fine
adjustment according to 4-(21).
• When setting the needle bar rather in a
lower position, be careful of the needle
thread lock between needle and inner
hook needle guard at the lower dead
point of the needle bar.
• When setting the needle bar rather in a
higher position, be careful of the contact
between the blade point of hook and the
belly section of needle.
Make small the clearance between needle
and the blade point (Make it near to “0”.)
Especially, in case of thick materials, use
the designated hook with needle guard.
Refer to the item “Stitch gathering at
overlapped section”.
Decrease the tension.
Correct to the proper tension. (0.2N is
recommended.)
Correct to the proper stroke. (8 mm is
recommended.)
Correct to the proper stroke at the position
of arm thread guide A. (Position of marker
line is standard, and when moving
counterclockwise, stroke of thread take-up
lever is increased.)
Adjust the tension to such an extent that
thread does not move roughly between
thread tensions No. 1 and No. 2.
(However, when the tension of thread
tension No. 1 is excessively high, thread
trimming performance is affected. Do not
excessively increase the tension.)
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