4
The bobbin case
Fabric dressing may fasten under the thread tension
spring and cause the thread tension to change. This
can be removed by means of a needle, which should
be inserted between the spring and the bobbin case.
Spare parts: See RA, page 9.
Ordering No: Bobbin case 401 1530-02.
Deposits from the fabric or thread can fasten on the
spindle of the hook and cause noise. If such is the
case, the spindle should be carefully cleaned with
the brush in the accessory box. At the same time
make sure that pieces of thread which have become
wound round the spindle are removed. In bad cases,
exchange the bobbin case.
Spare parts: See RA, page 9.
Ordering No: Bobbin case 401 1530-02.
The hook cover
Requirements
The inside of the hook cover must not be
damaged. Both axial and radial movement
should be possible.
Action
Exchange the hook cover if it is damaged.
Check that the holes in the hook cover are not
blocked and that the shoulder screws and the
holders are not damaged. Regarding the gap
between the hook cover and the driver, see page 21.
Comments
The inside of the hook cover makes a support for
the hook and the bridge above the finger of the bobbin
case supports the thread, so that the thread loop is
formed on the right side of the needle. The possibility
of movement in the hook cover is a prereguisite to
avoid unnecessary noise.
Spare parts: See RA, page 9.
Ordering No: Hook cover 411 6662-01.
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