Figure 9-35.Timing tbe sewing hook.
under the hole in the bobbin case. (See figure
9-35.) Turn the screw into raise the hook, and
out (while pressing down on the hook) to lower
it. The gauge should barely pass between the
throat plate and bobbin case stop finger.
Retighten the Allen setscrews and turn the
adjusting screw in so that a slight tension is left
on the screw.
SETTING SEWING HOOK TO OR FROM
NEEDLE. To set the relative position of the
hook saddle to the needle, loosen the hook saddle
adjusting screws (fig. 9-36) and slide the hook
saddle to the right or left, as necessary, to set the
point of the hook as close to the needle as possible
(without actually touching). After setting the hook
saddle, check the clearance between the hook
drive gear and the face of the hook saddle. This
clearance should be 0.008 inch; if it is not, reset
it by loosening the screw and setscrew in the hook
drive gear, and move the gear to the right or left
to get the proper clearance.
TIMING BOBBIN CASE OPENER. To set
the bobbin case opener, turn the balance wheel
toward the operator until the lower timing mark
on the needle bar is barely visible below the needle
bar frame on its upward stroke. Tip the machine
back and loosen the two Allen screws in the
bobbin case opener drive gear; then line up the
timing marks by turning the opener shaft with a
screwdriver. The timing marks are located as
follows: one on the flange of the opener, and the
other on the hook saddle (fig. 9-35). Adjust the
opener so it lightly touches the bobbin case and
turns it enough to make a sufficient opening for
a free passage of thread between the bobbin case
stop finger and the throat plate. Tighten the
screws in the bobbin case opener drive gear.
RAISING OR LOWERING THE FEED
DOG. To raise or lower the feed dog, remove
Figure 9-36.Hook saddle assembly showing bobbin case raceway oil reservoir.