1-48
S-4001 ISBH+I SM 30°
Released: 09/2017
E-mail: [email protected]; webside: amfreece.com
Phone: +420 582 309 146; Fax: +420 582 360 606
E - STANDARD MACHINE ADJUSTMENT
14. THREAD TENSION
The thread tension influences the appearance of the buttonhole. A thread tension change may be needed if the
thread and fabric change. Check to be certain all parts, which contact the thread, are smooth and polished with no
burrs or sharp edges.
•
By turning the tension knob
1
clockwise, the thread tension increases.
•
By turning the tension knob
1
anti-clockwise, the thread tension decreases.
NOTE:
Too big thread tension can cause the unsightly appearance of the buttonhole when sewing on a thin and
elastic material.
14.1.
Adjustment of the Tension Discs Opening
The opening of the tension discs is performed when the second bar is sewn. When the tension discs are opened,
it is possible:
a)
To pull the thread from the spool when the draw-off lever
2
receives the impulse for
operation.
b)
By decreasing or increasing of the air flow it is possible to regulate the tightening of the last stitch of the
buttonhole.