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IV. OPERATION
1. Operation of the sewing machine
As for the operation of the sewing machine, refer to the Instruction Manual for the LK-1900B.
WARNING :
• When performing the selection of the pattern or enlargement/reduction of the sewing width, make sure
of the needle entry point. If the needle extends outside the button hole or the sewing pattern extends
outside the button clamp unit, the needle interferes with the button hole or the button clamp unit during
sewing, resulting in the danger of the needle breakage or the like.
• While checking the shape of the pattern, do not depress the pedal upto the second step. Sewing will
start by so depressing the pedal. So, be careful.
2. Various sewing modes
(1) 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 fit the standard sewing width of the sewing 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.
• As for the way of confirmation of the needle entry, refer to the confirmation of the shape of sewing pattern in the Instruction
Manual for the LK-1900B.
(Caution) When ascertaing the needle entry point of the sewing pattern, there is a section of jump feed of one
stitch before the needle mouse from the origin (center of the button) to the first stitch.
Table of XY scales in terms of the sewing width
X, Y
2.4
2.6
2.8
(mm)
%
71
76
82
(2) Soft-start
Setting of the soft-start speed at the start of sewing of this machine is "1st stitch : 400 sti/min, and 2nd stitch : 900 sti/min"
only at the time of standard delivery.
When slip-off of thread at the start of sewing or the like occurs, increase the number of stitches of the soft-start in accor-
dance with the thread used and sewing products for use.
For the setting procedure of the soft-start, refer to
Manual for LK-1900B.
(3) Thread clamp
Thread clamp device of this machine is set to thread clamp motion prohibited (memory switch) at the time of standard deliv-
ery.
When the thread clamp device is actuated, high-speed start or prevention of slip-off of needle thread at the start of sewing
can be performed. However, there are some matters that demand special attention. When using the machine, refer to
Thread clamp device" p.23
3.0
3.2
3.4
3.6
88
94
100
106
"I.8-1. Method of changing memory switch data" p.51
of the Instruction Manual for LK-1900B.
4.0
4.3
4.5
4.7
118
126
132
138
6
−
−
5.2
5.6
6.0
6.2
153
165
176
182
of the Instruction
6.4
188
"I.5-8.
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