SunStar KM-1172BLX User Manual page 25

4) Examples of Dual Tension Application
4-1) Basic Specifications
- For the sewing process of handling significant height difference of sewing material, the presser foot cross
overlap and the tension of the upper thread should be increased to get best sewing quality.
- Turn off the dual tension button C and adjust the tension of the main thread adjusting device according to
the conditions of the main sewing material A.
- Turn on the dual tension button C and adjust the tension of the sub thread adjusting device according to the
conditions of the thick sewing material B.
- Proceed with general sewing work after the dual tension button C is turned off. When the machine reaches
Point B on the sewing material, press the dual tension button C to increase the upper thread tension. When
the sewing for height difference is completed, press the dual tension button C to decrease the upper thread
tension and continue sewing.
A
4-2) Optional Specifications
- When sewing the materials with different height on left and right sides, the independently
operating (optional) dual tension can be used to get the best sewing quality.
- As in Figure 4-26, when sewing the materials with different height on left and right sides,
upper thread tension should be given differently to the left and right sides to get the best
sewing quality. As such, the sub thread adjusting device should be adjusted as follows:
① Basic specifications: The sub thread adjusting device that supplies upper thread to the thick
part A is reset every time of operation.
② Optional specifications: Turn on the button to operate the sub thread adjusting device that
supplies upper thread to the thick part A between the independently operating function
switch's dual tension L and R.
- After the sewing with height difference is done, manually adjust the tension of the sub thread
adjusting device to return to default value in case of basic specifications, and press the dual
tension L, R button to reduce the upper thread tension in case of the optional specifications.
A
B
C
[Fig. 4-31]
[Fig. 4-32]
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