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(1) Setting the AW bobbin changing method
< U345 Bobbin changing
method selection screen >
When you press
Ⓐ
on the AW setting item list screen, the U345 Bobbin chang-
ing method selection screen is displayed.
AW bobbin changing method can be set to the "auto" or "manual".
The initial value of the bobbin changing method selection can be set with the memory switch U345.
The bobbin changing method you have changed with this AW setting function is also saved under the
memory switch U345.
A
: Auto
The number of stitches to be sewn before changing the bob-
bin is automatically selected from read-in patterns and the
preset bobbin-thread winding lengths. In addition, the number
of stitches to be sewn before changing the bobbin is auto-
matically updated according to the remaining-thread allow-
ance length at the time of changing the bobbin. In the case
the "auto" is selected, the updated number of stitches will be
returned to the initial value by carrying out one of the following
operations.
1. If the remaining-thread allowance length setting does not match the sewing condi
-
tions, the bobbin thread may run out during sewing.
2. If the remaining-thread allowance length is set to a small value, the bobbin thread
may run out due to changes in bobbin-thread consumption.
It is therefore necessary to check the actual remaining-thread length before chang
-
ing the set value.
3. If the remaining-thread allowance length is 3.5 m, some waiting time can occur
according to the swing conditions such as the thread count, bobbin-thread winding
length and sewing pattern. In such a case, check the actual remaining thread length
and re-set it.
4. If the bobbin thread tension of two bobbins differs, the remaining-thread length will
also differ. It is necessary, therefore, to adjust so that the bobbin thread tensions of
two bobbins are equal.
5. Automatic update of the preset number of stitches is carried out from the fourth au
-
tomatic change of bobbin.
6. Under the trial stitching mode, the preset number of stitches is not automatically
updated. In addition, note that the preset number of stitches is initialized after the
completion of trial stitching.
B
: Manual
Bobbin is changed according to the number of stitches to be sewn before changing the bobbin.
Under the manual mode, the number of stitches to be sewn before changing the bobbin is counted
using the bobbin thread counter on the counter setting screen.
・
In the case of reading in a pattern on the AW operation
screen
・
In the case the bobbin change is carried out on the AW
operation screen
・
In the case the bobbin is taken out on the AW operation
screen
・
In the case the bobbin thread winding length is changed on
the AW setting screen
・
In the case of changing the AW number-of-stitches input
mode from "manual" to "auto"
A
B
