Technical Support - Randall UNION Lockstitch Instruction Manual

Timing
Shuttle timing - F
The thread should release off the needle about halfway
on the shuttle hook. If the needle holds the thread too
long or too short, then the shuttle needs to be delayed or
advanced.
on the lower right hand corner of the machine, in
•
a cut out in the casting, you will see a gear (Ul-72)
with 2 screws on it. The shuttle gear shaft has a flat
spot under the adjustment screws. Loosening one
screw and tightening the other causes the gear to shift
positions on the shaft, thus affecting the shuttle point
(Ul-276).
To advance the shuttle point, loosen the bottom screw
•
and tighten the top screw
To delay the shuttle point, loosen the top screw and
•
tighten the bottom screw
The shuttle point should be approxmatly 1/8" (3mm)
•
from the needle when the needle is on the way down
and level with the hook point. At this position, the hook
is about to enter the loop.
when the Take-Up Ul-135 is at its highest position, the
•
point of the needle should be about 1/16" below the
plate.
Time the shuttle point so it just clears the descending
•
needle. Turn the flywheel back and forth with the
needle point close to the shuttle point to make certain
the needle clears the shuttle point without striking in
either direction.
NOTE: After timing the shuttle point, it may be nessary
•
to change the fine adjustment of the needle
Needle timing - F
This adjustment should be made AFTER timing the shuttle
point
locate the timing gear on the lower, far right cut out of
•
the casting.
To raise the the needle, loosen the top screw and
•
tighten the bottom screw.
To lower the the needle, loosen the bottom screw and
•
tighten the top screw.
when the take up roll is at its highest point, the barb
•
of the needle should be 1/4" below the surface of the
throat plate.
14

technical Support

A
INe djUSTMeNT
A
INe djUSTMeNT
R
a n da l l
UL-276
UL-72
1-800-327-9420
UnIOn
l
O c k
Since 1858
-S
t I tc h