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The gap between the hook cover and driver
The gap between the hook cover and the driver
should be such that when the hook is exchanged
for the hook clearance gauge 401 1649 or
411 1635, the gauge should have no play but can
be turned.
Adjustment
Dismantle the hook cover (9/15) and change the
sewing hook for gauge 411 1649 or 411 1635.
Reassemble the hook cover. Loosen the three
screws (9/14) which fasten the holders to the
free arm. Check that the holders move easily in
their holes in the free arm. The gap between the
hook cover and the driver is adjusted by
displacing the holders in the appropriate
direction. This is done in two stages.
Begin with the holders (1 and 3). These are
adjusted simultaneously by carefully pushing the
shoulder screws (9/16) with the fingertips until
they rest against the hook cover in the cover
holes. The two holders should then be fastened
to the arm by means of the screws (9/14). Then
adjust the height of the holder (2). To avoid too
much clearance (at point No. 4) in the hook, light
pressure should be applied at this point on the
hook cover instead of on the holder (2). This
ensures that the holder (2) is lifted up somewhat.
The holder should then be fastened by means of
the screw (9/14). Thereafter, check that the correct
clearance is attained. There should be slight
resistance when turning the gauge.
Spare parts: See RA, page 9.
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