Section 12: Checking Loop Lift And Needle Distance - Baby Lock Regalia BLRG20 Service Manual

Section 12: Checking Loop Lift and Needle Distance

Tools required: Loop Lift clamp (part #QM40199), 2.2 mm forked feeler gauge (part #QM40136), 2 mm ball
end L Allen wrench, 2 mm handle Allen wrench and #3 flat screwdriver.
Loop lift and needle height both set correctly
Page 32
 IMPORTANT: The timing and needle distance
adjustment must be done with the front machine
cover on .
Loop Lift is a universal hook and timing term for all lock-stitch
sewing machines. When the needle lifts a specified distance
from the BDC (bottom dead center), the hook point is set
to coincide with the needle. This is the radial position of
the hook called Loop Lift, commonly referred to as timing.
Another part of timing is the Needle Distance. This is the
axial distance from the hook point to the needle. Loop Lift is
the radial setting of the hook and Needle Distance is the axial
setting of the hook. Both of these are set on the hook and
fixed with the same set screws. Since two things are being set
at the same time, this can be a little difficult until practiced.
 NOTE: The loop lift clamp used must have a plastic
protective compression pad, so as not to damage the
coating on the needle bar
Check and Observe the following:
• Remove the needle plate .
• Turn the hand wheel until the needle bar is at its lowest
position or BDC (bottom dead center) .
•
Place the loop lift clamp (with special protective compression
pad) on the needle bar and set the thumbscrew lightly.
•
Place the 2.2 mm feeler gauge between the clamp and the
bottom of the head frame bearing surface.
•
Raise, reset and tighten the clamp, pinching the 2.2 mm feeler
gauge in between the clamp and projected bearing. This step
may need to be repeated a few times to remove all excess play
between the clamp and gauge.
•
Remove the 2.2 mm feeler gauge.
•
Rotate the hand wheel in the direction of motion, This is very
important! until the clamp lightly touches the gauging surface.
 IMPORTANT: If the hand wheel is turned too hard, the
clamp may slip, making the check invalid.
•
Check the position of the hook point relative to the needle.
•
Check the distance between the needle and the hook point.
The hook point should lightly touch (brush) the needle inside
the needle scarf . Too much needle distance or improper loop
lift settings may cause shredding and skipped stitches. Too little
distance will cause the needle to bend during sewing and cause
other issues .
 NOTE: This is explained in more detail on page 35.)
.
Regalia Service Manual