Hikari HK2900, Инструкция по эксплуатации

Страница: 148 / 195

67
Phenomenon cause Countermeasure page
1.Thread
dropped
when sewing
。
①
needle skipped at
begging running
。
②
upper thread too short
after trimming
③
bottom thread too
short
。
④
first stitch upper thread
tension is too high
。
⑤
thread catch force
instable
（
elastic fabric,
coarse thread ,thick thread
）
⑥
first stitch space is too
short
。
○
leave space between machine
needle and hook to 0.05 ‐ 0.1mm
。
○
set soft start at beginning
running
。
○
adjust second thread tensioner
tension
。
○
to make bigger bounce of
thread take ‐ up spring or put
down first thread tensioner
tension
。
○
put down bottom thread
tension
。
○
increase space between needle
hole and fixed knife
。
○
put down first stitch tension
。
○
slow down start running speed
to about
（
600~1000rpm
）
○
increase catch thread stitch to
3~4
。
○
increase first stitch space
。
○
put down first stitch upper
thread tension
。
33
38
16
15
34
2.Thread easy to
broken even
polyester thread
① Check damage of hook
and drive
。
② Check damage of
needle hole guide
。
③ Machine needle touch
presser foot
。
④ Thread end enters to
the groove of big
hook
。
⑤ Upper thread tension
too high
。
⑥ Too big bounce of
thread take ‐ up spring
。
○
remove and made grinding
。
○
use file or replace
。
○
adjust presser foot position
。
○
remove middle hook make
cleaning
。
○
take down upper thread
tension
。
○
take down the thread take ‐ up
spring bounce
。
○
use silicon oil
。
33
15
16
14
10.Causes and countermeasure for the fault at sewing