11-1-2) Adjusting Blade Tension; 11-2) Adjusting The Trimmer Return Spring - SunStar SWF/C Series User Manual

11-1-2) Adjusting Blade Tension

Make sure to check and adjust the cross-tension of the movable and the fixed blades after replacement or repair.
① Checking the cross tension
Manually move the movable blade and cut the upper
and the lower threads. Check the cross-section of the
thread cut.
② Adjusting the cross tension
Adjust the cross tension using fixed blade tension
control screws (see [Fig.11-3]). Manually move the
movable blade and adjust that it crosses in parallel with
the cutting line of the fixed blade from its entry point
to its return point.
[NOTE]
Avoid excess cross-tension. It may cause the movable blade to wear out from overload at its entry or
return point.
11-2) ADJUSTING THE TRIMMER RETURN
SPRING
1) Function
The trimmer return spring detects if the movable blade
returns to the correct position after trimming. If the
machine operates without the blade returned to its correct
position, the needle and the blade may be damaged. The
trimmer return spring detects and stops the machine if the
blade has not returned.
2) Adjustment
① Unfasten the spring shaft screw so that the center of the
spring hole is around 2mm away from the surface to
which the screw is attached (see [Fig.11-4]). Save the
location of the spring. Turn the spring holder #1 to
adjust the tension of the return spring and refasten the
screw.
② Adjust the return spring so that the surface and the
spring are around 1mm apart.
Movable blade
Sensor
Sensor screw
11-2
Tension
control
screw
Fixed blade
[Fig.11-3]
1mm
Sensor
[Fig.11-4]