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5
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3. EXPLANATION OF STITCH LENGTH COMPENSATION FUNCTION
(1) Function
When changing over the upper stitch length or the lower stitch length (turn ON/OFF the stitch length changing
switch.), it is ideal if the stitches are as illustrated in the figure below.
However, there may rarely be some machines, which make the sticthes as shown in the figure below when the
short sticth length is changed to upper stitch or lower stitch.
1) In case the upper stitch becomes small
2) In case the upper stitch becomes large
As shown in the above figure, the upper stitch is not the same as the lower stitch when the stitch length is
changed.
At this time, adjust the stitch length changing variable resistor so that the upper and lower stitches become the
same by adding the stitch length of section (b) of the above figure.
(2) Operation
1) In case of a > a’
1
In case of a > a’, the lower stitch is larger than the
upper stitch. Add the compensation amount to the
upper stitch length.
In this case, press up the stitch length change switch,
and adjust the stitch length change variable resistor
so that the lower stitch becomes the same as the upper
stitch.
2) In case of a < a’
2
In case of a < a’, add the compensation amount to
the lower stitch length as the upper stitch is larger than
the lower stitch.
In this case, press down the stitch length change
switch, and adjust the stitch length change variable
resistor so that the lower stitch becomes the same as
the upper stitch.
Upper stitch
Lower stitch
Change-over of
stitch length
a = a’
Upper stitch
Lower stitch
a
a’
Upper stitch
Lower stitch
Upper stitch
Lower stitch
a
a’
a
Change-over of
stitch length
In case of a > a’
Upper stitch
Lower stitch
Upper stitch
Lower stitch
a
a’
a
Change-over of
stitch length
In case of a < a’
Stitch length
change switch
Up
Small
Stitch length change
variable resistor
Down
Large
(b)
(b)
