4)⑤( ④,
)②。
. 3
1),
①
B ,
①
。B,
①
4) Screw down screw ④when adjustment is
over, fit tension disco (assembly) into the m⑤
-achine, and screw down screw .②
3.Judgment basis for adjustment adequacy of
take-up spring
1)Confirm that the tension of take-up sprin
-g is properly adjusted, draw out the needle
①
thread in direction B. If place B of needle threa
-d is drawn before take-up spring reaches it
①
-s lowest position, reduce the tension of take
-up spring .
①
:
1. ,
。
2. ,
,
。,
Caution:
1.To prevent the unexpected startup
of sewing machine, trim off the pow
-er supply before the operation is co
-nducted.
2.The take-up spring is already adju
-sted properly before the machine le
-aves the factory as a rule, and it req
-uires readjustment only for sewing
of special materials or usage of spe
-cial stitch threads.
19 Fig.1918 Fig.18
B AB A
※,
。B
※The tension of take-up spring
is too high, so needle thread is
drawn out of place B in proces
-s of the action.
※
※The take-up spring kee
-ps on functioning till the
end. ④⑤
①
③
①
②③
( 20)
Adjusting the Tension of Stitch Thread (Fig.20)
14
A
B
1.
1)
①
(), A ;
(),。B
.2
1C) ②()
(, ; D
-1.Adjusting the tension of needle thread
1) The tension of needle thread is increase
-d if the adjusting nut
①
in tension disco is tur
-ned clockwise (namely in direction A), and it
is reduced if the nut is turned counterclockwi
-se (namely in direction B).
2.Adjusting the tension of bobbin thread
1)The tension of bobbin thread is increase
-d if the adjusting screw ②is turned clockwis
-e (namely in direction A), and it is reduced if t
-12-