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5-2. Needle thread clamp device
Stitch failures (slip-off of the needle thread, stitch skipping and needle-thread
stains) are prevented during the high-speed start procedure as well as
consistent sewing performance is ensured by operating the needle thread
clamp device. The needle thread clamp device can be turned ON/OFF with
THREAD CLAMP button
A
. The thread clamp device cannot be used
simultaneously with the bird’s nest reducing device. ( Refer to
for details.)
When the memory switch U035 is placed in “disabled”, the needle thread clamp device
will not operate. Every time THREAD CLAMP button
A
is pressed, the status of the
thread clamp device and bird’s nest reducing device is changed over as: Thread clamp
device ON - Bird’s nest reducing device ON - Both devices OFF.
Select one of the three different functions that you want to use at the beginning of sewing as shown in
the table given below.
The thread clamp device cannot be used simultaneously with the bird’s nest reducing device.
Thread clamp
operation at the
beginning of sewing
Thread trimming
operation at the
beginning of sewing
Needle thread clamp
device ON
ON
OFF
When this device is placed in ON, stable sewing
performance is ensured at the beginning of
sewing and high-speed start is enabled.
Bird’s nest reducing
device ON
OFF
ON
When this device is placed in ON, the length
of thread remaining on the reverse side of
material at the beginning of sewing is reduced.
Both devices OFF
OFF
OFF
It becomes the same sewing start as
conventionally.
A
In case of with the needle thread clamp, the stan-
dard of the length of needle thread is 40 to 50 mm.
• To prevent the thread from slipping off from the
needle eyelet at the beginning of sewing or to
prevent stitch skipping from the first stitch
→
Adjust the length of needle thread longer
within the range.
• To prevent stitch skipping within the second to
tenth stitches from the beginning of sewing
→
Adjust the length of needle thread shorter
within the range
40 to 50mm
(1) When with thread clamp (motion), use the sewing machine after adjusting the needle thread length
at the start of sewing to 40 to 50 mm. When the needle thread length is too long, the needle thread
end held with the needle thread clamp may be rolled in the seams.
(2) When you use the thread clamp, set the thread tension at the beginning of sewing to approximately
20. If the thread tension is excessively low, the thread will flap significantly, causing thread tangling.
If it is excessively high, on the other hand, the thread will slip off the needle eyelet and the thread
clamp will fail to work. The thread tension at the beginning of sewing, up to the third stitch, can be
set with the memory switches U019 to U024.
