Duerkopp Adler 275, Инструкция по эксплуатации

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6.6 Setting the hook thread tension
Caution: danger of injury
Turn off the main switch.
The hook thread tension may only be adjusted with the
machine turned off.
Setting the hook thread tension
The hook thread tension setting must be such as to produce a seam like the one shown
in fig. a) in section 6.
–
At a recommended hook thread tension of 30g, for example, 15g should be
produced by the braking spring 1 and 15g by the tension spring 4.
–
The basic setting for the tension spring 4 is as follows:
The bobbin housing must slowly descend under its own weight. See the sketch in section 6.5.
The braking spring 1 prevents the bobbin from running on when the thread is cut.
The two tension values are adjusted as follows:
–
Unscrew the regulating screw 3 until the leaf spring 4 is no longer under tension.
–
Set the braking spring 1 by screwing in the regulating screw 2 until half the
recommended shuttle-tension value is exerted by the braking spring.
–
Place the bobbin in the bobbin-housing top and thread the looper thread (see section 6.5).
–
Place the bobbin housing with bobbin in the shuttle.
–
Turn the handwheel until the machine has completed one stitch.
–
Use the needle thread to pull the looper thread to the top of the stitch hole.
–
Pull the looper thread downwards at an angle of 45
°
in the direction of sewing.
About half the tension value should be perceptible.
Then tighten regulating screw 3 to the recommended tension value.
14
1
4 3
2