TV×7 , . , ( 20
),
.
16 Adjustment of the height of needle bar (Fig.20)
When the needle of TV×7 is used, if the graduation on the needle bar is at the bottom dead centre, the
mark of graduation shall be in line with the lower end of the needle bar bushing, lower, as indicated in
Fig20.
( 21) B , B 3.7mm,
.
1. ( 22).
2. .
3. , .
4. , B , .
5. .
17 Adjustment of the needle and looper(Figs.21 and 22)
Adjustment of forward & backward motion of the looper The dimension of part B of the looper in an
elliptic motion can be measured, (refer to Fig.21). The max. dimension of part B is usually 3.7mm, suitable for
sewing operation of needles of all kinds of sizes.
The adjusting procedure is as follows
1.
Take off the rubber plug on the crank case of the looper(refer to Fig.22)
2.
Turn the balance wheel by hand.
3.
First loosen set screw and positioning screw, and then adjust marked screw.
4.
Turn clockwise the adjustable screw on which punch mark is printed, and The
dimension of part B will be increased in value.
5.
Tighten set screw and positioning screw.
, , ( 23).
18 The timing of looper in reference to needle(Fig.23)
The looper shall be moved backward to the lowest position while the needle is at
. 11 .
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