Singer 491D, Руководство по обслуживанию

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When the feed dog is at its highest position,
approximately the full depth of all the teeth should
project above the top surface of the throat plate, as
shown in Fig. 12.
Before checking the height of the feed dog, set
the machine for the longest stitch.
To adjust, loosen the clamping screw P, Fig. 13
and raise or lower the feed dog (which is fastened to
the feed bar Q, Fig. 13) as required.
Then securely tighten screw P.
The feed dog should be level
at the top of its feed path. If
not, tip machine back and loosen
feed bar hinge pin clamping screw
A4 just enough to turn feed bar
hinge pin (eccentric) B4, Fig. 13.
Insert screwdriver into access
hole in end of bed and turn hinge
pin B4 as required to level the
feed dog. Securely tighten clamp-
ing screw A4. Check feed dog
height.
It is found necessary to adjust the feed dog height due to the material
being sewn and/or exchanging the feed dog and throat plate, it should be
adjusted in the manner explained above.
NOTE: Feed dog should not contact edges of the throat plate slots during
its movement but should be located centrally in relation to the front, rear
and sides of throat plate slots,
NOTE: Whenever the timing of the feed is changed, sewing hook should be
checked for necessary adjustment also, as instructed on page 5.
TO SET FEED DOG AT CORRECT HEIGHT
Fig. 13
B4
A4
P
Q
HIGHER
LOWER
Fig. 12
FULL DEPTH OF TEETH THROAT PLATE