( 8 9 10)
( 8 )
.
( 9 )
.
( 10 ) .
9 Thead tension asm.(Figs 8,9 and 10)
To adjust needle thread tension in accordance whth sewing woking condition, we can adjust
needle thread tension by tension spring. Turn the tension nut clockwise to increase the tension;
turn counter-clockwise to decrease the tension.
To adjust bobbin thread tension
Turn tension screw clockwise to increase the tension; turn tension screw counter- clockwise to
decrease the tension. The relation between the needle thread and the bobbin thread as shown in
(Fig.10) depicts the forming of chain stitch.
( 11) , , . ,
27 30mm (5 ) .
, ( 12).
10 Presser foot (Figs.11 and 12)
Adjustment of pressure on presser foot (Fig.11)
Turn pressure regulating thumb screw clockwise to increase the pressure; turn pressure-
regulating thumb screw counter-clockwise to decrease the pressure. For general fabric the
standard height of pressure regulating thumb screw is about 27 30mm (5Kg.)
The presser bar lifter shall be turned either leftward or rightward in order to keep the presser
foot under the condition of lifting postion.
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