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97
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3-1. Adjusting the knife for the shorter thread remaining thread trimmer
3. ADJUSTMENT OF THE SEWING MACHINE
When the compressed air is supplied, shorter-thread
remaining thread trimmer cylinder
moves forward.
This is the initial position.
In the case cylinder
does not move
forward when the compressed air is sup-
plied, the piping connection is not cor-
rect.
Be aware mechanical failures such
as needle breakage can occur, if sewing
is carried out without correcting the con-
nection of piping.
At the aforementioned initial position, loosen the nut
and adjust the cylinder guide
so that the notch
mark
in the knife base is aligned with the notch
mark
on the moving knife base.
Knife base
Throat plate asm.
(7.5mm)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
(2) Selection of the sewing pattern and the sewing width
Selection of the sewing pattern is the same as that of the LK-1900B.
When the distance between holes of the button used does not t the standard sewing width of the sew-
ing pattern No., adjust the sewing width by enlarging/reducing the sewing width.
The way of enlarging/reducing is the same as that of the LK-1900B. Refer to the table given below for
the scale for enlargement/reduction in terms of the sewing width.
After changing the sewing pattern No. and the sewing width, make sure of the needle entry point.
As for the way of conrmation, refer to the
"I.5-4. Checking the contour of a sewing pattern"p.20
in the
instruction manual for the LK-1900B.
Table of XY scale in terms of the sewing width
X•Y
(mm)
% 71 76 82 88 94 100 106 118 126 132 138 153 165 176 182 188
2.4 2.6 2.8 3.0 3.2 3.4 3.6 4.0 4.3 4.5 4.7 5.2 5.6 6.0 6.2 6.4
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