Lewis 17 - Page 17

j
J
15
;) the machine. See Plate 4, Page 34.
~
46. To replace the hook preceding instruc.tion apply, with the
added caution regarding timing the hook. This is a simple matter by
noting the lines on both the upper
and lower gears 1028 and 1030,
Figure K. Both of these gears
have lines which must meet and
make a straight line. The groove
in the hook shaft must also be in
straight line with the two lines
on gears 1028 and 1030, so that
the point of spot screw 1031 will
fit into the groove on the hook
shaft. When inserting a new
hook, the groove may not be in
the same relative position as in
the one removed, which will
throw the hook out of time. To
complete the adjustment it may
-be necessary to loosen the two
screws that hold gear 1028 in
position. Turn the hook slightly
to th«;! right in order to pick up
GEAR-1028
SCREWS
GEAR-1030
the thread loop more quickly from
the needle; or turn the hook pick
up the needle thread loop more
Figure K
slowly, whichever may be required.
Tighten the tvyro screws in gear 1028, making sure this
with gear 1030 but without excessive backlash.
gear runs. freely
47. You will note that the point of the hook when properly timed,
will be at its lowest point or immediately above the needle and about
1/16 of an inch from the eye of the needle when the needle is on its
return or back stroke. In this, as with all other adjustments, be very
careful to see that all screws are_ securely tightened and any parts
that have been removed are carefully replaces in position.
CAUTION: Before timing hook, make sure that needle is
correctly timed with plunger, see paragraph 53, pa_ge 17.
RAISING AND LOWERING HOOK
48. The height of the hook relative to the needle is set at the
factory and generally requires no adjustment. In case it does become
necessary to chang~ the height of the hook, remove gear 1030, Figure