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Insert the needle which long groove faces you and push it up deep into the needle hole until it stops and
tighten Screw (i).
Differential feed ratio adjustment
The ditlerential teed ratio is the ratio of movements between Main Feed Dog and Differential feed dog,
when the movement of Main feed dog is bigger than differential feed dog. the fabric
be
stretched in sewing,
Uthcrcise the fabric be shrinked.
Loosen Nut Q) then turn screw ® in clock\vise for stretching the
fabric, and in reverse
direction for
shrinking the fabric then tighten Nut
CD.
Note:
~·hen
the surface of adjusting level® be set at the scale®
the differential feed ratio is 1: I,
and if it
be
~et
over the scale its ratio can be adjustable up to I
:0.7.
r
I
I
I
Scale
1
2
3
4
5
1:1.3
-
1:0.7
1:0.9
1:1.1
1:1.3
Differe-
ntial
1:2
I
:0.7
1:1
I:
1.4
I: 1.7
1:2
Feed
1:3
1:1
I :1.5
1:2
1:2.5
1:3
ratio
1:4
1:1.1
1:1.6
1:2.3
1:2.8
1:3.3
Fig.
11
Parts relation and
timing
1. Needle and
Needle Plate Fig.12
When the Needle
moves to the highest position, the distance between needle point (left needle if
two needle)
and needle
plate is 9.5-9.7mm for standard lift machine or
I
0.8-II.Omm
for high lift machine. Each needle must centers in each
needle
slot of Needle plate. The right needle must ahead about
0.~-0.Jmm
than left needle. And the distance between the needle
point (right needle if two needle) to needle slot of Needle Plate or
presser foot is 1.2mm.
Slightly loosen Screw Q)ofNeedle Drive Crank.
Rotate the pulley to check if needle center in each needle slot of
needle plate. or you may loosen screw®and adjust needle holder.
1\
~.5-'1.7
High Lifl
lfU~-11
Fig. 12
Rotate the pulley for removing the needle to the highest
position, tap the Needle Holder guide until the
~orrcct
needle height is obtained. Tighten screw(i).
2. Upper Looper(Spreader)and
Needle Fig.13
When the Upper
(spreader) moves to the extremely
left, the distance between the point of looper (spreader)
and center line of needle
is 4.5-5.0, for I needle
(spreader) to center line of left needle is 5.5-6.0mm for 2 needle
machine.
- 4 -
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