Loop Lift And Needle Distance Adjustment - Janome QMP16SU Manual

Loop Lift and Needle Distance Adjustment

Loop Lift is a universal hook and timing term for all lock-stitch sewing machines. When the needle lifts a
specified distance from BDC (bottom dead center), the hook point is set to coincide with the needle. This
radial position of the hook is 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 adjustments are set at the same time, this can be a little difficult until
practiced.
Check
Tools: Loop lift clamp part #QM40199, 2.2 mm forked feeler gauge part #QM40136, 2 mm ball end L-hex
wrench, 2 mm handle hex wrench, and a #3 flat screwdriver
 NOTE: The loop lift clamp must have a plastic protective compression pad to avoid damaging the
coating on the needle bar.
 IMPORTANT: The timing and needle distance adjustment must be done with the front machine
cover on. This is because needle position may shift when the front over is installed and tightened
properly.
1. Remove the needle plate.
2. Turn the hand wheel until the needle bar is at its
lowest position or BDC.
3. Place the loop lift clamp (with special protective
compression pad) on the needle bar and set the
thumbscrew lightly.
4. Place the 2.2 mm feeler gauge between the
clamp and the bottom of the head frame bearing
surface.
5. Raise, reset and tighten the clamp, pinching
the 2.2 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.
6. Remove the 2.2 feeler gauge (first image at
right).
7. Rotate the hand wheel in the direction of
motion, until the clamp lightly touches the
gauging surface. (second image at right).
 IMPORTANT: If the hand wheel is turned too
hard, the clamp may slip, making the check
invalid.
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QMP16SU Service Manual