Singer Confidence 7463 Service Manual page 33

DETAILS OF TECHNICAL ASPECTS OF FEED CONTROL
FEED CONTROL UNIT - Half step version
A. Position of pulse motor gear at origin point
Rotational ratio of gear (A) vs pulse motor gear (B) is 1:2.5. Rotation of motor gear (A) is 1/2 step per 1
pulse and 3.75 (7.5 divided by 2) degrees resulting in the gear (B) rotated at 1.5 (3.75 divided by 2.5) degree.
There are 48-step exciting positions (segments) with 7.5 degree rotation per
1 step on the pulse motor. Therefore, 7.5 degree rotation per 1 pulse coincides with exciting positions and
center of non-exciting positions alternatively.
Stitch length is set at 0.25 mm for rotation of motor gear (B) of 3.75 degrees per 1 pulse.
B. Position of feed regulator at maximum forward feed
Maximum possible forward feed amount is 4.5 mm from the position shifted 7.5 degrees with 2 pulses from
the origin point.
AND ZIGZAG BIGHT CONTROL UNITS
Added: January, 2006
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