5-27.Rotor; 5-28.Button Clamp Pressure - Brother CB3-B917 Service Manual

Chainstitch button sewer
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5. ADJUSTMENT

5-27.Rotor

Take-in
Decrease
Increase
520s
The standard position of the rotor is the position where, with the machine stopped, the 1.5 mark (B917A) is aligned with the take-
in.
For B916A, it is where the 2 mark is aligned with the take-in. Increasing the scale setting increases the thread amount.
If the thread end hangs out at the first stitch buttonhole, reduce the rotor setting. (Fig. A)
If the thread end hangs out at the second stitch buttonhole, increase the rotor setting. (Fig. B)

5-28.Button clamp pressure

523s
41
Thread remainder at first stitch
Rotor
Nut (upper)
Nut
CB3-B916A/B917A
Fig. A
521s
Loosen the two nuts, and turn the nut (upper) until the fabric
will just hold without slipping when it is lightly pulled.
Fig. B
Thread missed at first stitch
522s

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