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Operation
Fig. 13: Adjusting the hook thread tension (1)
Proper setting
The hook thread tension must be set so that the resulting seam
pattern is uniform.
The basic setting for the tension spring is performed as follows:
• When the bobbin case contains a full bobbin it must sink
slowly under its own weight.
The braking spring (1) prevents the bobbin running on when the
thread has been cut.
Fig. 14: Adjusting the hook thread tension (2)
①
②
③
(1) - Braking spring
(3) - Adjusting wheel
(2) - Tension spring
34
Operating Instructions D669 M-TYPE DELTA - 00.0 - 10/2020
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