Necchi Supernova Instructions Manual page 106

If the number of impulses is still under 135, repeat the
adjustments " A ", " B ", " C " and " D ". If the number of impulses
is more than 170 (for each turn of the cam axle), proceed as
explained in the second test.
If the number of impulses, which the cam axle makes during
one full turn of 360 degrees, is more than 165, correct as follows:
Turn the balance wheel by hand and bring the thread take-up lev-
er to its highest position; set the design graduating knob at " 4 "
(see Fig. 89).
Shift the cam connecting lever No. D (A 26/3/25) to its working
position (toward the arm of the machine), so that the screws "A"
" B " are fully visible (Figs. 89, 90 and 91).
Loosen slightly screw " A ", and loosen also very slightly screw
" B". Move the graduation pointer " C" slightly toward the
" minus " sign (Fig. 91).
Now, tighten screws " A " and " B ".
Check again the number of impulses of the cam axle during one
turn
of same, as previously explained under (2).
If necessary repeat adjustments " A ", " B ", " C " and " D ".
The adjustment of the graduation pointer " C " is very sensitive,
therefore, very slight changes of its position are required.
Horn to count the number of impulses of the cam axle.
The following instructions will help you to facilitate this
procedure:
Place the cam " 0 " (zero cam), or the gauge cam No. 10.2, on the
cam axle (instead of the regular cams).
With a pencil, mark a short line on the zero cam (or the gauge
cam No. 10.2) and then mark another short line on the mounting
plate of the "Automatic " device (see Fig. 92).
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Copyright -2004